CN113587068A

CN113587068A - Cogeneration system based on multi-heat source coupling and adjusting method

Info

Publication number: CN113587068A
Application number: CN202110834942.XA
Authority: CN
Inventors: 尹国安; 王永贞; 朱登元; 于本福; 寇学森
Original assignee: Linyi University
Current assignee: Linyi University
Priority date: 2021-07-23
Filing date: 2021-07-23
Publication date: 2021-11-02

Abstract

The invention discloses a heat and power cogeneration system based on multi-heat source coupling and an adjusting method, which mainly comprise the following steps: the combined heat and power generation unit comprises a combined heat and power generation unit, a condenser, an industrial steam user, a back pressure machine, a generator, an electric network, a steam type electrode boiler, a steam pressure reducing device, a steam buffer device, a steam-water mixed heating device, a circulating water pump, a steam-water heat exchanger, a water-water heat exchanger, a hot water heat storage device, a heating user, a photovoltaic power generation device, an inversion control device and an electric energy storage device. According to the invention, through the integration of cogeneration steam supply and heating, the diversified and multi-grade heat demand of users is met, the cascade utilization of energy is realized, the power peak regulation capability of the cogeneration system is developed, and the market application prospect is wide.

Description

Cogeneration system based on multi-heat source coupling and adjusting method

Technical Field

The invention belongs to the technical field of cogeneration, and particularly relates to a cogeneration system based on multi-heat source coupling and an adjusting method, which are particularly suitable for the cogeneration system with steam supply and heating requirements at the same time.

Background

At present, in order to improve the comprehensive energy utilization efficiency of the thermal power generating unit and strive for more electricity generation utilization hours, the pure condensing unit is widely developed to supply heat. However, for different industrial steam users, the required steam pressure parameters are different due to different processes, and for the thermoelectric power unit, only one main pipeline for supplying steam to the outside is provided, namely, only steam with one pressure parameter can be supplied to the outside. Therefore, mismatching of steam supply parameters of the thermoelectric generating set and steam users is caused, the steam consumption requirements of the steam users cannot be guaranteed, and energy loss is caused to a certain extent. Particularly, the requirement of the rapid development of new energy power on the peak regulation capacity of the thermal power generating unit is stricter and stricter, but the peak regulation capacity of the thermal power generating unit is seriously low because the cogeneration unit cannot be flexibly regulated for ensuring heat supply, and the requirement of national energy transformation at the present stage cannot be met.

In addition, in recent years, as the industrial park advances energy conservation and emission reduction and rapid development of centralized heating, a high-pollution and low-energy-efficiency heating boiler of the original industrial park is gradually shut down and replaces the high-pollution and low-energy-efficiency heating boiler with a cogeneration centralized heating mode, however, energy requirements for steam users and heating users are different, generally speaking, a hot water pipe network is laid for the heating users, and a steam pipe network is laid for the steam users, so that the investment of pipe network construction is very large.

In conclusion, the technical problems in the market are mainly solved by the following technical means: the Chinese patent 'high-low pressure two-stage industrial steam extraction and heat supply device of a steam turbine' with the application number of 201310667813.1 can meet the requirements of high-low pressure two-stage steam of a heat user by a certain technical means, but has the defect that two steam main pipelines need to be laid, thereby greatly increasing the investment cost; in particular, the same problem is encountered with each increase in the demand for a vapor pressure parameter. Aiming at the technical problems, the invention integrates the cogeneration steam supply flow and the heating flow with high efficiency, supplies heat to heating users through a steam pipe network, utilizes the electric power of the electric network and the electric power of photovoltaic power generation to produce steam to make up the heat supply of the cogeneration unit, utilizes a heat storage device to make up the difference of electric heating load on time and space, thereby meeting the power peak regulation requirement of the cogeneration unit, simultaneously recycles the residual energy at the steam user side in the aspect of energy saving to meet the power demand of electric equipment and the heating demand of the heating users, thereby not only reducing the investment cost of the cogeneration centralized heating system, improving the power peak regulation capacity of the cogeneration system, meeting diversified and multi-grade heating demands, but also realizing the step recycling of energy through the residual energy recycling, and meeting the development demand of the policy of national energy transformation, has wide market application prospect.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a heat and power cogeneration system and a regulating method based on multi-heat-source coupling, which have reasonable design and reliable performance.

The technical scheme adopted by the invention for solving the problems is as follows: a cogeneration system based on coupling of multiple heat sources, comprising: the system comprises a cogeneration unit, a condenser, a first type of industrial steam users, a steam buffer device, a steam pressure reducing device, a first steam type electrode boiler, a power control switch, a power grid, a second type of industrial steam users, a first back pressure machine, a first generator, a second steam type electrode boiler, a steam-water mixed heating device, a heating user, a second back pressure machine, a second generator, a steam-water heat exchanger, a water-water heat exchanger, a drainage circulating pump, a heat grid-water circulating pump, a hot water heat storage device, a heat storage circulating pump, a heat release circulating pump, a photovoltaic power generation device, an electricity energy storage device, inversion control equipment and a third steam type electrode boiler, wherein a steam outlet of the cogeneration unit is connected with a steam inlet of the condenser, an industrial steam outlet of the cogeneration unit is connected with a steam inlet end of an industrial steam conveying pipe, and a first valve is arranged at the industrial steam outlet of the cogeneration unit, the steam outlet end of the industrial steam conveying pipe is respectively connected with the steam inlet of a first-class industrial steam user, the steam inlet of a first back-pressing machine and the steam inlet of a second back-pressing machine through a first industrial steam branch pipe, a second industrial steam branch pipe and a third industrial steam branch pipe, a third valve is arranged on the first industrial steam branch pipe, a seventh valve is arranged on the second industrial steam branch pipe, an eighth valve is arranged on the steam inlet of the first back-pressing machine, a fifteenth valve is arranged on the third industrial steam branch pipe, a sixteenth valve is arranged on the steam inlet of the second back-pressing machine, the power grid is connected with the first steam type electrode boiler through a power control switch, the steam outlet of the first steam type electrode boiler is simultaneously connected with the steam inlet of the steam buffer device and the steam inlet of the steam pressure reducing device, and a fourth valve is arranged on the steam inlet of the steam buffer device, a sixth valve is arranged at a steam inlet of the steam pressure reducing device, a steam outlet of the steam buffer device is connected with a steam inlet of a first type of industrial steam user, a steam pressure balance valve is arranged at a steam outlet of the steam buffer device, the steam outlet of the steam pressure reducing device is connected with the steam inlet of the first type of industrial steam user, a fifth valve is arranged at the steam outlet of the steam pressure reducing device, a steam outlet of the first back press is connected with the steam inlet of a second type of industrial steam user, a ninth valve is arranged at the steam outlet of the first back press, a first steam bypass is arranged between the steam inlet and the steam outlet of the first back press, a tenth valve is arranged on the first steam bypass, the first back press drives the first generator to do work to generate power, and the power generated by the first generator is transmitted to the second steam type electrode boiler to generate steam, the steam outlet of the second steam type electrode boiler is respectively connected with the steam inlet of a second type industrial steam user and the steam inlet of the steam-water mixed heating device through a first steam branch pipe and a second steam branch pipe, a twelfth valve is arranged on the first steam branch pipe, a thirteenth valve is arranged on the second steam branch pipe, the steam outlet of the second back press is connected with the steam inlet of the steam-water heat exchanger, a seventeenth valve is arranged at the steam outlet of the second back press, a second steam bypass is arranged between the steam inlet and the steam outlet of the second back press, an eighteenth valve is arranged on the second steam bypass, the second back press drives a second power generator to do work for power generation, the drain outlet of the steam-water heat exchanger is connected with the drain inlet of the water-water heat exchanger, a nineteenth valve is arranged at the drain outlet of the steam-water heat exchanger, and a twentieth valve is arranged at the drain inlet of the water-water heat exchanger, the water-water heat exchanger is characterized in that a water-drainage inlet of the water-water heat exchanger is simultaneously connected with a water-drainage outlet of a first type of industrial steam user, a water-drainage outlet of a second type of industrial steam user and a high-temperature water outlet of a steam-water mixed heating device through a first water-drainage conveying pipe, a thirty-seventh valve is installed at the water-drainage outlet of the first type of industrial steam user, an eleventh valve is installed at the water-drainage outlet of the second type of industrial steam user, a fourteenth valve is installed at the high-temperature water outlet of the steam-water mixed heating device, the water-drainage outlet of the water-water heat exchanger is connected with a water-drainage inlet of a condenser through a second water-drainage conveying pipe, a twenty-first valve is installed at the water-drainage outlet of the water-water heat exchanger, a water-drainage circulating pump is installed on the second water-drainage conveying pipe, a second valve is installed at the water-drainage inlet of the condenser, and a heat supply network water outlet of a heating user is connected with a heat supply network water inlet of the water heat exchanger through a heat supply network return pipe, a heat supply network water circulating pump is arranged on the heat supply network water return pipe, a twenty-fourth valve is arranged at a heat supply network water inlet of the water-water heat exchanger, a heat supply network water outlet of the water-water heat exchanger is connected with a water inlet of the steam-water heat exchanger, a twenty-fifth valve is arranged at a heat supply network water outlet of the water-water heat exchanger, a twenty-seventh valve is arranged at a water inlet of the steam-water heat exchanger, a water outlet of the steam-water heat exchanger is connected with a heat supply network water inlet of a heating user through a heat supply network water supply pipe, a twenty-eighth valve is arranged at a water outlet of the steam-water heat exchanger, a twenty-ninth valve is arranged on the heat supply network water supply pipe, a heat storage end of the hot water heat storage device is respectively connected with the heat supply network water inlet of the water-water heat exchanger and the water outlet of the steam-water heat exchanger through a first heat storage pipe and a second heat storage pipe, a thirty valve and the heat storage circulating pump are arranged on the first heat storage pipe, and a thirty-eleventh valve is arranged on the second heat storage pipe, the heat release end of the hot water heat storage device is respectively connected with the water outlet of a heat supply network water circulating pump and the water inlet end of a heat supply network water supply pipe through a first heat release pipe and a second heat release pipe, a thirty-two valve is installed on the first heat release pipe, a thirty-three valve and a heat release circulating pump are installed on the second heat release pipe, the photovoltaic power generation device is simultaneously connected with an electric energy storage device and a third steam type electrode boiler through an inversion control device, the electric energy storage device is also connected with the third steam type electrode boiler through the inversion control device, the steam outlet of the third steam type electrode boiler is respectively connected with the steam inlet of a second back pressure machine and the steam inlet of a first back pressure machine through a third steam branch pipe and a fourth steam branch pipe, a thirty-fourth valve is installed at the steam outlet of the third steam type electrode boiler, and a thirty-fifth valve is installed at the third steam branch pipe, and a thirty-sixth valve is arranged on the fourth steam branch pipe.

Further, the steam-water mixed heating device is a direct contact heat exchanger, and steam from the second steam type electrode boiler and externally supplied feed water are subjected to mixed heat exchange in the steam-water mixed heating device.

Furthermore, a first drainage bypass is arranged on the drainage side of the water-water heat exchanger, a twenty-second valve is installed on the first drainage bypass, a heat supply network water bypass is arranged on the heat supply network water side of the water-water heat exchanger, and a twenty-sixth valve is installed on the heat supply network water bypass.

Furthermore, a second hydrophobic bypass is arranged between the water outlet of the hydrophobic circulating pump and the heat supply network water return pipe, and a twenty-third valve is installed on the second hydrophobic bypass.

Furthermore, the electric power generated by the second generator is used for driving power equipment such as a drainage circulating pump, a heat supply network water circulating pump, a heat storage circulating pump and a heat release circulating pump to do work, and the electric power generated by the first generator is also used for driving power equipment of a second type of industrial steam user to do work.

Further, the electric energy storage device may be a storage battery energy storage device or a capacitor energy storage device.

The adjusting method of the cogeneration system based on multi-heat source coupling is characterized by comprising the following steps:

opening and adjusting the first valve, supplying industrial steam generated by the cogeneration unit to the outside through an industrial steam delivery pipe, and supplying steam to a first-class industrial steam user, supplying steam to a second-class industrial steam user and supplying heat to a heating user through a first industrial steam branch pipe, a second industrial steam branch pipe and a third industrial steam branch pipe respectively;

at the moment, the third valve and the thirty-seventh valve are opened and adjusted, the industrial steam from the industrial steam conveying pipe is directly supplied to the first type of industrial steam users for production and use, the steam drainage generated by the first type of industrial steam users is externally supplied through the first drainage conveying pipe, in addition, the steam pressure balance valve, the fourth valve, the fifth valve and the sixth valve can be opened and adjusted, the first steam type electrode boiler utilizes the power of the power grid to produce steam through the power supply control switch, when the flow of industrial steam from the industrial steam conveying pipe is insufficient, the steam generated by the first steam type electrode boiler is supplemented for the first type industrial steam users through the steam pressure reducing device, when the steam flow rate of the first type of industrial steam users is suddenly increased to cause unstable steam supply pressure of the industrial steam delivery pipe, the steam generated by the first steam type electrode boiler is used for balancing the steam supply pressure for the first type of industrial steam users through the steam buffer device;

at the moment, opening and adjusting a seventh valve, an eighth valve, a ninth valve, a tenth valve and an eleventh valve, wherein industrial steam from an industrial steam conveying pipe enters a first backpressure machine to drive a first generator to do work and generate power, the other part of industrial steam and exhaust steam of the first backpressure machine are conveyed to a second type of industrial steam user together to be supplied to the second type of industrial steam user for production and use, electric power generated by the first generator is supplied to a second steam type electrode boiler to generate steam, and steam drainage generated by the second type of industrial steam user is supplied to the outside through a first drainage conveying pipe;

at the moment, a twelfth valve, a thirteenth valve and a twenty-sixth valve are closed, a second valve, a fifteenth valve, a sixteenth valve, a seventeenth valve, an eighteenth valve, a nineteenth valve, a twentieth valve and a twenty-first valve are opened and adjusted, industrial steam from an industrial steam conveying pipe enters a second back pressure machine to drive a second generator to do work and generate power, the other part of industrial steam and exhaust steam of the second back pressure machine are conveyed to a steam-water heat exchanger together to heat power grid water, electric power generated by the second generator is used for driving power equipment such as a drainage circulating pump, a heat grid water circulating pump, a heat storage circulating pump and a heat release circulating pump to do work, steam drainage from a first type of industrial steam users and steam drainage from a second type of industrial steam users enter a water-water heat exchanger together through a first drainage conveying pipe and steam drainage formed by the steam-water heat exchanger to heat the heat grid water, the drain water cooled by the water-water heat exchanger returns to the condenser through a second drain conveying pipe under the driving of a drain circulating pump, a twenty-fourth valve, a twenty-fifth valve, a twenty-seventh valve, a twenty-eighth valve and a twenty-ninth valve are opened and adjusted at the same time, the return water of a heat supply network from a heating user is conveyed to the water-water heat exchanger through a return water pipe of the heat supply network under the driving of the water-heating circulating pump of the heat supply network to be heated by a first stage, and then enters the steam-water heat exchanger to be heated by a second stage, and the formed high-temperature water of the heat supply network is conveyed to the heating user through a water supply pipe of the heat supply network to be heated;

at the moment, the photovoltaic power generation device generates power by utilizing solar energy, then the power generated by the photovoltaic power generation device is supplied to the third steam type electrode boiler through the inversion control equipment to generate steam and is also supplied to the electric energy storage device to be stored, when the power used for generating the steam by the third steam type electrode boiler is insufficient, the power stored by the electric energy storage device can also be supplied to the third steam type electrode boiler through the inversion control equipment to generate the steam, at the moment, the thirty-fourth valve, the thirty-fifth valve and the thirty-sixth valve can be opened and adjusted, and the steam generated by the third steam type electrode boiler respectively supplies the steam for the second type industrial steam users and supplies the heat for the heating users through the fourth steam branch pipe and the third steam branch pipe.

Furthermore, when the cogeneration unit needs to run at a power-up load, the running at the power-up load of the cogeneration unit can be realized by reducing the flow of industrial steam supplied from the cogeneration unit to the outside, and the running at the power-up load of the cogeneration unit can be realized by increasing the running power of the cogeneration unit;

if the flow of the industrial steam supplied by the cogeneration unit to the outside is reduced, then:

the industrial steam flow transmitted to the first type of industrial steam users through the first industrial steam branch pipe can be reduced, at the moment, the power supply control switch is turned on, the first steam type electrode boiler utilizes the electric power of a power grid to produce steam, the fifth valve and the sixth valve are opened simultaneously, the steam generated by the first steam type electrode boiler firstly enters the steam pressure reducing device to be subjected to pressure reduction, and then is supplied to the first type of industrial steam users to make up the steam flow which is less supplied by the cogeneration unit;

the flow rate of the industrial steam conveyed to the second type of industrial steam users through the second industrial steam branch pipe can also be reduced, at the moment, on one hand, the twelfth valve is opened to supply the steam generated by the second steam type electrode boiler to the second type of industrial steam users to compensate the low-supply steam flow rate of the cogeneration unit, and on the other hand, the thirty-fourth valve and the thirty-sixth valve are opened to supply the steam generated by the third steam type electrode boiler to the second type of industrial steam users to compensate the low-supply steam flow rate of the cogeneration unit;

the flow of the industrial steam conveyed to the steam-water heat exchanger through the third industrial steam branch pipe can be reduced, at the moment, on one hand, the heat of the steam which is less supplied by the cogeneration unit is made up by utilizing the heat released by the hot water heat storage device through opening the thirty-second valve and the thirty-third valve, and on the other hand, the steam which is generated by the third steam type electrode boiler is supplied to the steam-water heat exchanger through opening the thirty-fourth valve and the thirty-fifth valve, so that the flow of the steam which is less supplied by the cogeneration unit is made up;

if the operation power of the cogeneration unit is increased and the flow of the industrial steam supplied to the outside by the cogeneration unit is increased, then:

the flow of the industrial steam conveyed to the steam-water heat exchanger through the third industrial steam branch pipe can be increased, at the moment, the thirtieth valve and the thirty-first valve are opened and adjusted, the thirty-second valve and the thirty-third valve are closed, and the hot water heat storage device stores heat to absorb the heat which is supplied by the steam-water heat exchanger and the water-water heat exchanger, so that the flow of the industrial steam which is supplied by the cogeneration unit is absorbed;

the opening degrees of a thirty-fourth valve, a thirty-fifth valve and a thirty-sixth valve can be reduced until the valves are closed, the steam flow transmitted to the second type of industrial steam users and the steam-water heat exchanger by the third steam type electrode boiler is reduced until the steam flow is zero, and the opening degrees of a seventh valve and a fifteenth valve are correspondingly increased, so that the steam flow transmitted to the second type of industrial steam users and the steam-water heat exchanger by the cogeneration unit is increased, and the industrial steam flow supplied by the cogeneration unit is consumed;

the opening degree of the fifth valve and the opening degree of the sixth valve can be reduced until the fifth valve and the sixth valve are closed, the steam flow transmitted to the first type of industrial steam users by the first steam type electrode boiler is reduced until the steam flow is zero, and the opening degree of the third valve is correspondingly increased, so that the steam flow transmitted to the first type of industrial steam users by the cogeneration unit is increased, and the industrial steam flow supplied by the cogeneration unit is consumed.

Furthermore, when the cogeneration unit needs to run with reduced power load, the running of the cogeneration unit with reduced power load can be realized by increasing the flow of the industrial steam supplied by the cogeneration unit to the outside and the running of the cogeneration unit with reduced power load can be realized by reducing the running power of the cogeneration unit;

if the flow of the industrial steam supplied by the cogeneration unit to the outside is increased, the following steps are carried out:

the opening degrees of the fifth valve and the sixth valve can be reduced until the fifth valve and the sixth valve are closed, the steam flow transmitted to the first type of industrial steam users by the first steam type electrode boiler is reduced until the steam flow is zero, and the opening degree of the third valve is correspondingly increased, so that the steam flow transmitted to the first type of industrial steam users by the cogeneration unit is increased, and the industrial steam flow supplied by the cogeneration unit is consumed;

if reducing the running power of the cogeneration unit must be synchronous with reducing the industrial steam flow supplied by the cogeneration unit to the outside, then:

the flow of the industrial steam conveyed to the steam-water heat exchanger through the third industrial steam branch pipe can be reduced, at the moment, on one hand, the heat of the steam which is less supplied by the cogeneration unit is compensated by utilizing the heat released by the hot water heat storage device to the outside by opening the thirty-second valve and the thirty-third valve, and on the other hand, the steam which is generated by the third steam type electrode boiler is supplied to the steam-water heat exchanger by opening the thirty-fourth valve and the thirty-fifth valve, so that the flow of the steam which is less supplied by the cogeneration unit is compensated.

Further, when the unit steam price provided by the industrial steam conveying pipe is larger than that provided by the first steam type electrode boiler, the opening degree of the third valve is reduced until the third valve is closed, the fifth valve and the sixth valve are opened and adjusted, the steam flow supplied to the first type of industrial steam users by the first steam type electrode boiler is increased, and the steam flow supplied to the first type of industrial steam users by the industrial steam conveying pipe is reduced until the steam flow is zero.

Furthermore, when the unit steam price provided by the industrial steam conveying pipe is less than that provided by the first steam type electrode boiler, the opening degrees of the fifth valve and the sixth valve are reduced until the fifth valve and the sixth valve are closed, the third valve is opened and adjusted, the steam flow supplied to the first type of industrial steam users by the industrial steam conveying pipe is increased, and the steam flow supplied to the first type of industrial steam users by the first steam type electrode boiler is reduced until the steam flow is zero.

Furthermore, when the price of the unit steam heat provided by the second steam type electrode boiler to the water-water heat exchanger is larger than that of the unit steam heat provided by the industrial steam conveying pipe to the second type of industrial steam users, the twelfth valve is closed, the thirteenth valve and the fourteenth valve are opened, the steam from the second steam type electrode boiler and externally-supplied feed water are subjected to mixed heat exchange in the steam-water mixed heating device to form hot water, and then the hot water is supplied to the water-water heat exchanger through the first drainage conveying pipe to supply heat to the heating users.

Furthermore, when the price of the unit steam heat provided by the second steam type electrode boiler to the water-water heat exchanger is less than the price of the unit steam heat provided by the industrial steam conveying pipe to the second type of industrial steam users, the thirteenth valve and the fourteenth valve are closed, the twelfth valve is opened, and the steam from the second steam type electrode boiler is directly provided to the second type of industrial steam users for use.

Further, when the unit steam price provided by the industrial steam conveying pipe is larger than that provided by the third steam type electrode boiler, the opening degrees of the seventh valve and the fifteenth valve are reduced until the seventh valve and the fifteenth valve are closed, the thirty-fourth valve, the thirty-fifth valve and the thirty-sixth valve are opened and adjusted, the steam flow rate supplied to the second type of industrial steam users and the steam-water heat exchanger by the third steam type electrode boiler is increased, and the steam flow rate supplied to the second type of industrial steam users and the steam-water heat exchanger by the industrial steam conveying pipe is reduced until the steam flow rate is zero.

Further, when the unit steam price provided by the industrial steam conveying pipe is less than that provided by the third steam type electrode boiler, the opening degrees of a thirty-fourth valve, a thirty-fifth valve and a thirty-sixth valve are reduced until the valves are closed, a seventh valve and a fifteenth valve are opened and adjusted, the steam flow of the industrial steam conveying pipe for supplying the second type of industrial steam users and the steam-water heat exchanger is increased, and the steam flow of the third steam type electrode boiler for supplying the second type of industrial steam users and the steam-water heat exchanger is reduced until the steam flow is zero.

Furthermore, when the steam flow rate for the first type of industrial steam users to produce and use is suddenly increased, the steam pressure supplied through the first industrial steam branch pipe is fluctuated, and at the moment, the steam flow rate which needs to be suddenly increased for the first type of industrial steam users to produce and use is made up by the steam buffer device through the action of the steam pressure balance valve, so that the steam pressure supplied to the first type of industrial steam users is ensured to be stable.

Furthermore, when the return water pressure of the heating network from the heating user is low, the twentieth valve is opened, the second valve is closed, and the drain water from the water-water heat exchanger is driven by the drain water circulating pump to be conveyed to the return water pipe of the heating network through the second drain bypass, so that water supplementing and pressure stabilizing are performed on the heating system of the heating user.

Further, when the power consumption of power equipment such as the drainage circulating pump, the heat supply network water circulating pump, the heat storage circulating pump and the heat release circulating pump changes, then adjust the aperture of sixteenth valve, seventeenth valve and eighteenth valve, change the steam flow who gets into the second backpressure machine to the generated energy of second generator is changed, the power consumption of power equipment such as the drainage circulating pump, the heat supply network water circulating pump, the heat storage circulating pump and the heat release circulating pump is matchd.

Compared with the prior art, the invention has the following advantages and effects: (1) the invention integrates the cogeneration steam supply flow and the heating flow with high efficiency by technical means, and utilizes the steam pipe network to supply steam for steam users and heat for heating users at the same time, thereby not only reducing the pipe network construction investment of a centralized heating system, but also meeting the diversified and multi-grade heat demand of the user side; (2) the method has the advantages that diversified energy requirements of heating users and steam users are coupled, the power grid power and the photovoltaic power generation power are used for producing steam to make up for the heat supply of a unit, the heat storage device is used for making up for the space-time difference of the electric heating load of the unit, the power peak regulation capacity of the cogeneration system is effectively improved, meanwhile, the cascade recycling of energy is realized through the recycling of residual energy, the policy development requirements of national energy transformation are met, and the method has a wide market application prospect.

Drawings

Fig. 1 is a system diagram of a cogeneration system and a regulation method based on multi-heat source coupling according to an embodiment of the present invention.

In the figure: 1-cogeneration unit, 2-condenser, 3-first class industrial steam user, 4-steam buffer device, 5-steam pressure reducing device, 6-first steam type electrode boiler, 7-power control switch, 8-power grid, 9-second class industrial steam user, 10-first back press, 11-first generator, 12-second steam type electrode boiler, 13-steam-water mixed heating device, 14-heating user, 15-second back press, 16-second generator, 17-steam-water heat exchanger, 18-water heat exchanger, 19-hydrophobic circulating pump, 20-heat grid water circulating pump, 21-hot water heat storage device, 22-heat storage circulating pump, 23-heat release circulating pump, 24-photovoltaic power generation device, 25-electric energy storage device, 26-inversion control equipment, 27-third steam type electrode boiler, 31-steam pressure balance valve, 32-first valve, 33-second valve, 34-third valve, 35-fourth valve, 36-fifth valve, 37-sixth valve, 38-seventh valve, 39-eighth valve, 40-ninth valve, 41-tenth valve, 42-eleventh valve, 43-twelfth valve, 44-thirteenth valve, 45-fourteenth valve, 46-fifteenth valve, 47-sixteenth valve, 48-seventeenth valve, 49-eighteenth valve, 50-nineteenth valve, 51-twentieth valve, 52-twenty-first valve, 53-twenty-twelfth valve, 54-twenty-third valve, 55-twenty-fourth valve, 56-twenty-fifth valve, 57-twenty-sixth valve, 58-twenty-seventh valve, 59-twenty-eighth valve, 60-twenty-ninth valve, 61-thirty valve, 62-thirty valve, 63-thirty-second valve, 64-twenty-third valve, 65-thirty-fourth valve, 66-thirty-fifth valve, 67-thirty-sixth valve, 68-thirty-seventh valve, 71-industrial steam delivery pipe, 72-first industrial steam branch pipe, 73-second industrial steam branch pipe, 74-third industrial steam branch pipe, 75-first steam bypass, 76-first steam branch pipe, 77-second steam branch pipe, 78-first drain delivery pipe, 79-a second steam bypass, 80-a first water drainage bypass, 81-a second water drainage conveying pipe, 82-a second water drainage bypass, 83-a heat supply network water return pipe, 84-a heat supply network water supply pipe, 85-a heat supply network water bypass, 86-a first heat storage pipe, 87-a second heat storage pipe, 88-a first heat release pipe, 89-a second heat release pipe, 90-a third steam branch pipe and 91-a fourth steam branch pipe.

Detailed Description

The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.

Examples are given.

Referring to fig. 1, in the present embodiment, a cogeneration system based on multi-heat source coupling includes: a cogeneration unit 1, a condenser 2, a first-class industrial steam user 3, a steam buffer device 4, a steam pressure reducing device 5, a first steam type electrode boiler 6, a power control switch 7, a power grid 8, a second-class industrial steam user 9, a first back pressure machine 10, a first generator 11, a second steam type electrode boiler 12, a steam-water mixed heating device 13, a heating user 14, a second back pressure machine 15, a second generator 16, a steam-water heat exchanger 17, a water-water heat exchanger 18, a drainage circulating pump 19, a heat grid water circulating pump 20, a hot water heat storage device 21, a heat storage circulating pump 22, a heat release circulating pump 23, a photovoltaic power generation device 24, an electric energy storage device 25, an inversion control device 26 and a third steam type electrode boiler 27, wherein a steam outlet of the cogeneration unit 1 is connected with a steam inlet of the condenser 2, an industrial steam outlet of the cogeneration unit 1 is connected with a steam inlet of an industrial steam conveying pipe 71, a first valve 32 is installed at an industrial steam extraction port of the cogeneration unit 1, a steam outlet end of an industrial steam conveying pipe 71 is respectively connected with a steam inlet of a first-class industrial steam user 3, a steam inlet of a first back-pressing machine 10 and a steam inlet of a second back-pressing machine 15 through a first industrial steam branch pipe 72, a second industrial steam branch pipe 73 and a third industrial steam branch pipe 74, a third valve 34 is installed on the first industrial steam branch pipe 72, a seventh valve 38 is installed on the second industrial steam branch pipe 73, an eighth valve 39 is installed at the steam inlet of the first back-pressing machine 10, a fifteenth valve 46 is installed on the third industrial steam branch pipe 74, a sixteenth valve 47 is installed at the steam inlet of the second back-pressing machine 15, a power grid 8 is connected with the first steam type electrode boiler 6 through a power control switch 7, a steam outlet of the first steam type electrode boiler 6 is simultaneously connected with the steam inlet of a steam buffer device 4 and the steam inlet of a steam pressure reducing device 5, a fourth valve 35 is installed at a steam inlet of the steam buffer device 4, a sixth valve 37 is installed at a steam inlet of the steam pressure reducing device 5, a steam outlet of the steam buffer device 4 is connected with a steam inlet of the first-class industrial steam user 3, a steam pressure balance valve 31 is installed at a steam outlet of the steam buffer device 4, a steam outlet of the steam pressure reducing device 5 is connected with a steam inlet of the first-class industrial steam user 3, a fifth valve 36 is installed at a steam outlet of the steam pressure reducing device 5, a steam outlet of the first back press 10 is connected with a steam inlet of the second-class industrial steam user 9, a ninth valve 40 is installed at a steam outlet of the first back press 10, a first steam bypass 75 is arranged between the steam inlet and the steam outlet of the first back press 10, a tenth valve 41 is installed on the first steam bypass 75, the first back press 10 drives the first generator 11 to generate power, the electric power generated by the first generator 11 is transmitted to the second steam type electrode boiler 12 to generate steam, the steam outlet of the second steam type electrode boiler 12 is respectively connected with the steam inlet of the second type industrial steam user 9 and the steam inlet of the steam-water mixed heating device 13 through a first steam branch pipe 76 and a second steam branch pipe 77, a twelfth valve 43 is installed on the first steam branch pipe 76, a thirteenth valve 44 is installed on the second steam branch pipe 77, the steam outlet of the second back press 15 is connected with the steam inlet of the steam-water heat exchanger 17, a seventeenth valve 48 is installed on the steam outlet of the second back press 15, a second steam bypass 79 is arranged between the steam inlet and the steam outlet of the second back press 15, an eighteenth valve 49 is installed on the second steam bypass 79, the second back press 15 drives the second generator 16 to do work and generate electricity, the drain outlet of the steam-water heat exchanger 17 is connected with the drain inlet of the water-water heat exchanger 18, a nineteenth valve 50 is arranged at a drain outlet of the steam-water heat exchanger 17, a twentieth valve 51 is arranged at a drain inlet of the water-water heat exchanger 18, the drain inlet of the water-water heat exchanger 18 is also connected with a drain outlet of a first type of industrial steam users 3, a drain outlet of a second type of industrial steam users 9 and a high-temperature water outlet of the steam-water mixed heating device 13 through a first drain conveying pipe 78, a thirty-seventh valve 68 is arranged at the drain outlet of the first type of industrial steam users 3, an eleventh valve 42 is arranged at the drain outlet of the second type of industrial steam users 9, a fourteenth valve 45 is arranged at the high-temperature water outlet of the steam-water mixed heating device 13, the drain outlet of the water-water heat exchanger 18 is connected with the drain inlet of the condenser 2 through a second drain conveying pipe 81, and a twenty-first valve 52 is arranged at the drain outlet of the water-water heat exchanger 18, a drain circulating pump 19 is installed on a second drain conveying pipe 81, a second valve 33 is installed at a drain inlet of the condenser 2, a heat supply network water outlet of a heating user 14 is connected with a heat supply network water inlet of a water heat exchanger 18 through a heat supply network water return pipe 83, a heat supply network water circulating pump 20 is installed on the heat supply network water return pipe 83, a twenty-fourth valve 55 is installed at the heat supply network water inlet of the water heat exchanger 18, a heat supply network water outlet of the water heat exchanger 18 is connected with a water inlet of a steam-water heat exchanger 17, a twenty-fifth valve 56 is installed at the heat supply network water outlet of the water heat exchanger 18, a twenty-seventh valve 58 is installed at a water inlet of the steam-water heat exchanger 17, a water outlet of the steam-water heat exchanger 17 is connected with the heat supply network water inlet of the heating user 14 through a heat supply network water supply pipe 84, a twenty-eighth valve 59 is installed at a water outlet of the steam-water heat exchanger 17, a twenty-ninth valve 60 is installed at the heat supply network water supply pipe 84, the heat storage end of the hot water heat storage device 21 is respectively connected with the heat supply network water inlet of the water-water heat exchanger 18 and the water outlet of the steam-water heat exchanger 17 through a first heat storage pipe 86 and a second heat storage pipe 87, a thirtieth valve 61 and a heat storage circulating pump 22 are installed on the first heat storage pipe 86, a thirty-first valve 62 is installed on the second heat storage pipe 87, the heat release end of the hot water heat storage device 21 is respectively connected with the water outlet of the heat supply network water circulating pump 20 and the water inlet end of the heat supply network water supply pipe 84 through a first heat release pipe 88 and a second heat release pipe 89, a thirtieth valve 63 is installed on the first heat release pipe 88, a thirtieth valve 64 and a heat release circulating pump 23 are installed on the second heat release pipe 89, the photovoltaic power generation device 24 is simultaneously connected with the electric energy storage device 25 and the third steam electrode boiler 27 through an inverter control device 26, the electric energy storage device 25 is also connected with the third steam electrode boiler 27 through the inverter control device 26, the steam outlet of the third steam type electrode boiler 27 is respectively connected with the steam inlet of the second back-pressing machine 15 and the steam inlet of the first back-pressing machine 10 through a third steam branch pipe 90 and a fourth steam branch pipe 91, a thirty-fourth valve 65 is installed at the steam outlet of the third steam type electrode boiler 27, a thirty-fifth valve 66 is installed on the third steam branch pipe 90, and a thirty-sixth valve 67 is installed on the fourth steam branch pipe 91.

In this embodiment, the steam-water mixing and heating device 13 is a direct contact heat exchanger, and the steam from the second steam type electrode boiler 12 and the externally supplied feed water perform mixed heat exchange in the steam-water mixing and heating device 13.

In this embodiment, the first drain bypass 80 is provided on the drain side of the water-water heat exchanger 18, the twentieth valve 53 is installed on the first drain bypass 80, the heat supply network water bypass 85 is provided on the heat supply network water side of the water-water heat exchanger 18, and the twenty-sixth valve 57 is installed on the heat supply network water bypass 85.

In this embodiment, a second water drainage bypass 82 is provided between the water outlet of the water drainage circulation pump 19 and the heat supply network water return pipe 83, and a twentieth valve 54 is installed on the second water drainage bypass 82.

In this embodiment, the electric power generated by the second generator 16 is used to drive power devices such as the drain circulating pump 19, the heat supply network water circulating pump 20, the heat storage circulating pump 22, and the heat release circulating pump 23 to do work, and the electric power generated by the first generator 11 is also used to drive the power devices of the second type industrial steam users 9 to do work.

In this embodiment, the electrical energy storage device 25 may be a storage battery energy storage device or a capacitor energy storage device.

In this embodiment, the adjustment method of the cogeneration system based on multi-heat source coupling is as follows:

opening and adjusting the first valve 32, supplying the industrial steam generated by the cogeneration unit 1 to the outside through the industrial steam delivery pipe 71, and supplying steam to the first-type industrial steam users 3, the second-type industrial steam users 9 and the heating users 14 through the first industrial steam branch pipe 72, the second industrial steam branch pipe 73 and the third industrial steam branch pipe 74;

at this time, the third valve 34 and the thirty-seventh valve 68 are opened and adjusted, the industrial steam from the industrial steam delivery pipe 71 is directly supplied to the first type industrial steam users 3 for production and use, the steam trap generated by the first type industrial steam users 3 is supplied to the outside through the first trap delivery pipe 78, in addition, the steam pressure balance valve 31, the fourth valve 35, the fifth valve 36 and the sixth valve 37 can be opened and adjusted, the first steam type electrode boiler 6 utilizes the power of the power grid 8 to generate steam through the power control switch 7, when the flow of the industrial steam from the industrial steam delivery pipe 71 is insufficient, the steam generated by the first steam type electrode boiler 6 supplements the steam supply for the first type industrial steam users 3 through the steam pressure reducing device 5, when the steam supply pressure of the industrial steam delivery pipe 71 is unstable due to the sudden increase of the steam flow for the first type industrial steam users 3, the steam generated by the first steam type electrode boiler 6 is used for balancing the steam supply pressure for the first type industrial steam users 3 through the steam buffer device 4;

at this time, the seventh valve 38, the eighth valve 39, the ninth valve 40, the tenth valve 41 and the eleventh valve 42 are opened and adjusted, industrial steam from the industrial steam conveying pipe 71 enters the first back press 10 to drive the first generator 11 to do work and generate power, another part of industrial steam and exhaust steam of the first back press 10 are conveyed to the second type of industrial steam users 9 together to be supplied to the second type of industrial steam users 9 for production and use, electric power generated by the first generator 11 is supplied to the second steam type electrode boiler 12 to generate steam, and steam drain generated by the second type of industrial steam users 9 is supplied to the outside through the first drain conveying pipe 78;

at this time, the twentieth valve 53, the twentieth valve 54 and the twenty-sixth valve 57 are closed, the second valve 33, the fifteenth valve 46, the sixteenth valve 47, the seventeenth valve 48, the eighteenth valve 49, the nineteenth valve 50, the twentieth valve 51 and the twenty-first valve 52 are opened and adjusted, the industrial steam from the industrial steam conveying pipe 71 enters the second back press 15 firstly, a part of the industrial steam drives the second generator 16 to do work and generate power, the other part of the industrial steam and the exhaust steam of the second back press 15 are conveyed to the steam-water heat exchanger 17 together to heat the heat supply network water, the electric power generated by the second generator 16 is used for driving power equipment working equipment such as the drainage circulating pump 19, the heat supply network water circulating pump 20, the heat storage circulating pump 22 and the heat release circulating pump 23, the steam drainage from the first-type industrial steam users 3 and the steam drainage from the second-type industrial steam users 9 enter the water heat exchange water together through the first drainage conveying pipe 78 and the steam drainage formed by the steam-water heat exchanger 17 The device 18 is used for heating the heat supply network water, the drain water cooled by the water-water heat exchanger 18 returns to the condenser 2 through the second drain conveying pipe 81 under the driving of the drain circulating pump 19, the twenty-fourth valve 55, the twenty-fifth valve 56, the twenty-seventh valve 58, the twenty-eighth valve 59 and the twenty-ninth valve 60 are opened and adjusted at the same time, the heat supply network return water from the heating users 14 is conveyed to the water-water heat exchanger 18 through the heat supply network return water pipe 83 under the driving of the heat supply network water circulating pump 20 to be heated for the first stage, then enters the steam-water heat exchanger 17 to be heated for the second stage, and the formed high-temperature heat supply network water is conveyed to the heating users 14 through the heat supply network water pipe 84 for heating;

at this time, the photovoltaic power generation device 24 generates power by using solar energy, then the power generated by the photovoltaic power generation device 24 is supplied to the third steam type electrode boiler 27 via the inverter control device 26 to generate steam and also supplied to the electric energy storage device 25 to be stored, when the power used by the third steam type electrode boiler 27 to generate steam is insufficient, the power stored by the electric energy storage device 25 can also be supplied to the third steam type electrode boiler 27 via the inverter control device 26 to generate steam, at this time, the thirty-fourth valve 65, the thirty-fifth valve 66 and the thirty-sixth valve 67 can be opened and adjusted, and the steam generated by the third steam type electrode boiler 27 respectively supplies steam to the second type industrial steam users 9 and supplies heat to the heating users 14 through the fourth steam branch pipe 91 and the third steam branch pipe 90.

When the cogeneration unit 1 needs to run with a power load, the running of the cogeneration unit 1 with the power load can be realized by reducing the flow of industrial steam supplied from the cogeneration unit 1 to the outside, and the running of the cogeneration unit 1 with the power load can be realized by increasing the running power of the cogeneration unit 1;

if the flow rate of the industrial steam supplied to the outside by the cogeneration unit 1 is reduced, then:

the industrial steam flow transmitted to the first-class industrial steam users 3 through the first industrial steam branch pipe 72 can be reduced, at this time, the power control switch 7 is turned on, the first steam type electrode boiler 6 utilizes the power of the power grid 8 to produce steam, the fifth valve 36 and the sixth valve 37 are turned on at the same time, the steam generated by the first steam type electrode boiler 6 enters the steam pressure reducing device 5 for pressure reduction, and then is supplied to the first-class industrial steam users 3 to make up the steam flow which is less supplied by the cogeneration unit 1;

the flow rate of the industrial steam to be sent to the second type of industrial steam users 9 through the second industrial steam branch pipe 73 can be reduced, in this case, on one hand, the twelfth valve 43 is opened to supply the steam generated by the second steam type electrode boiler 12 to the second type of industrial steam users 9 to compensate for the low-supply steam flow rate of the cogeneration unit 1, and on the other hand, the thirty-fourth valve 65 and the thirty-sixth valve 67 are opened to supply the steam generated by the third steam type electrode boiler 27 to the second type of industrial steam users 9 to compensate for the low-supply steam flow rate of the cogeneration unit 1;

the flow rate of the industrial steam to be sent to the steam-water heat exchanger 17 through the third industrial steam branch pipe 74 can be reduced, in this case, on one hand, the thirtieth valve 63 and the thirtieth valve 64 are opened to release heat to the outside by the hot water heat storage device 21, so as to compensate for the heat of the steam which is short of the supply of the cogeneration unit 1, and on the other hand, the thirty-fourth valve 65 and the thirty-fifth valve 66 are opened to supply the steam generated by the third steam type electrode boiler 27 to the steam-water heat exchanger 17, so as to compensate for the flow rate of the steam which is short of the supply of the cogeneration unit 1;

if the operation power of the cogeneration unit 1 must be increased in synchronization with the increase of the flow of the industrial steam supplied from the cogeneration unit 1 to the outside, then:

the flow rate of the industrial steam which is delivered to the steam-water heat exchanger 17 through the third industrial steam branch pipe 74 can be increased, at this time, the thirtieth valve 61 and the thirty-first valve 62 are opened and adjusted, the thirtieth valve 63 and the thirtieth valve 64 are closed, and the hot water heat storage device 21 stores heat to absorb the heat which is supplied by the steam-water heat exchanger 17 and the water-water heat exchanger 18, so that the industrial steam flow which is supplied by the cogeneration unit 1 is absorbed;

the openings of the thirty-fourth valve 65, the thirty-fifth valve 66 and the thirty-sixth valve 67 can be reduced until the valves are closed, the steam flow transmitted to the second type industrial steam users 9 and the steam-water heat exchanger 17 by the third steam type electrode boiler 27 is reduced until the steam flow is zero, and the openings of the seventh valve 38 and the fifteenth valve 46 are correspondingly increased, so that the steam flow transmitted to the second type industrial steam users 9 and the steam-water heat exchanger 17 by the cogeneration unit 1 is increased, and the industrial steam flow which is supplied by the cogeneration unit 1 in an excessive way can be consumed;

the opening degree of the fifth valve 36 and the sixth valve 37 can be reduced until the fifth valve is closed, the steam flow delivered to the first type industrial steam users 3 by the first steam electrode boiler 6 is reduced until the steam flow is zero, and the opening degree of the third valve 34 is correspondingly increased, so that the steam flow delivered to the first type industrial steam users 3 by the cogeneration unit 1 is increased, and the industrial steam flow supplied by the cogeneration unit 1 is consumed.

When the cogeneration unit 1 needs to operate with a reduced power load, the reduced power load operation of the cogeneration unit 1 can be realized by increasing the flow of the industrial steam supplied from the cogeneration unit 1 to the outside, and the reduced power load operation of the cogeneration unit 1 can be realized by reducing the operation power of the cogeneration unit 1;

if the flow rate of the industrial steam supplied to the outside by the cogeneration unit 1 is increased, then:

the opening degree of the fifth valve 36 and the sixth valve 37 can be reduced until the fifth valve is closed, the steam flow delivered to the first type industrial steam users 3 by the first steam type electrode boiler 6 is reduced until the steam flow is zero, and the opening degree of the third valve 34 is correspondingly increased, so that the steam flow delivered to the first type industrial steam users 3 by the cogeneration unit 1 is increased, and the industrial steam flow supplied by the cogeneration unit 1 is consumed;

if reducing the running power of the cogeneration unit 1 must be synchronized with reducing the flow of the industrial steam supplied from the cogeneration unit 1 to the outside, then:

the flow rate of the industrial steam to be sent to the steam-water heat exchanger 17 through the third industrial steam branch pipe 74 may be reduced, and at this time, the heat of the steam that is short of the power of the cogeneration unit 1 is compensated by opening the thirtieth and thirty-

fifth valves

63 and 64 to release heat to the outside by the hot water thermal storage device 21, and the flow rate of the steam that is short of the power of the cogeneration unit 1 is compensated by opening the thirty-fourth and thirty-fifth valves 65 and 66 to supply the steam generated by the third steam type electrode boiler 27 to the steam-water heat exchanger 17.

In the load adjustment method of the embodiment, when the price per unit steam provided by the industrial steam delivery pipe 71 is greater than the price per unit steam provided by the first steam electrode boiler 6, the opening degree of the third valve 34 is reduced until it is closed, the fifth valve 36 and the sixth valve 37 are opened and adjusted, the steam flow rate supplied to the first type of industrial steam users 3 by the first steam electrode boiler 6 is increased, and the steam flow rate supplied to the first type of industrial steam users 3 by the industrial steam delivery pipe 71 is reduced until it is zero.

In the load adjustment method of the embodiment, when the price per unit steam provided by the industrial steam delivery pipe 71 is less than the price per unit steam provided by the first steam electrode boiler 6, the opening degrees of the fifth valve 36 and the sixth valve 37 are closed until the unit steam is closed, the third valve 34 is opened and adjusted, the steam flow rate of the industrial steam delivery pipe 71 to the first type of industrial steam users 3 is increased, and the steam flow rate of the first steam electrode boiler 6 to the first type of industrial steam users 3 is reduced until the steam flow rate is zero.

In the load adjustment method of the embodiment, when the price per unit steam heat provided by the second steam electrode boiler 12 to the water-water heat exchanger 18 is greater than the price per unit steam heat provided by the industrial steam delivery pipe 71 to the second type of industrial steam users 9, the twelfth valve 43 is closed, the thirteenth valve 44 and the fourteenth valve 45 are opened, and the steam from the second steam electrode boiler 12 and the externally-supplied feed water are subjected to mixed heat exchange in the steam-water mixed heating device 13 to form hot water, and then the hot water is supplied to the water-water heat exchanger 18 through the first drain delivery pipe 78 to heat the heating users 14.

In the load adjustment method of the embodiment, when the price per unit steam heat provided by the second steam electrode boiler 12 to the water-water heat exchanger 18 is less than the price per unit steam heat provided by the industrial steam delivery pipe 71 to the second type of industrial steam users 9, the thirteenth valve 44 and the fourteenth valve 45 are closed, the twelfth valve 43 is opened, and the steam from the second steam electrode boiler 12 is directly provided to the second type of industrial steam users 9.

In the load adjustment method of the embodiment, when the unit steam price provided by the industrial steam delivery pipe 71 is greater than the unit steam price provided by the third steam type electrode boiler 27, the opening degrees of the seventh valve 38 and the fifteenth valve 46 are reduced until the third valve is closed, the thirty-fourth valve 65, the thirty-fifth valve 66 and the thirty-sixth valve 67 are opened and adjusted, the steam flow rate supplied by the third steam type electrode boiler 27 to the second type industrial steam users 9 and the steam-water heat exchanger 17 is increased, and the steam flow rate supplied by the industrial steam delivery pipe 71 to the second type industrial steam users 9 and the steam-water heat exchanger 17 is reduced until the steam flow rate is zero.

In the load adjustment method of the embodiment, when the unit steam price provided by the industrial steam delivery pipe 71 is less than the unit steam price provided by the third steam type electrode boiler 27, the openings of the thirty-fourth valve 65, the thirty-fifth valve 66 and the thirty-sixth valve 67 are closed until the openings are closed, the seventh valve 38 and the fifteenth valve 46 are opened and adjusted, the steam flow rate supplied to the second type industrial steam users 9 and the steam-water heat exchanger 17 by the industrial steam delivery pipe 71 is increased, and the steam flow rate supplied to the second type industrial steam users 9 and the steam-water heat exchanger 17 by the third steam type electrode boiler 27 is reduced until the steam flow rate is zero.

In the load adjustment method of the embodiment, when the flow rate of the steam used for production of the first type industrial steam consumer 3 suddenly increases, the fluctuation of the steam pressure supplied through the first industrial steam branch pipe 72 is caused, and at this time, the steam buffer device 4 is used for compensating the steam flow rate which needs to be suddenly increased for production and use of the first type industrial steam consumer 3 through the action of the steam pressure balance valve 31, thereby ensuring that the steam pressure supplied to the first type industrial steam consumer 3 is stable.

In the load adjustment method of the embodiment, when the return water pressure of the heating network from the heating user 14 is low, the twentieth valve 54 is also opened, the second valve 33 is closed, and the drain water from the water-water heat exchanger 18 is driven by the drain water circulating pump 19 to be conveyed to the return water pipe 83 of the heating network through the second drain bypass 82, so that water supplement and pressure fixation for the heating system of the heating user 14 are realized.

In the load adjustment method of this embodiment, when the power consumption of the power equipment such as the drain circulation pump 19, the heat grid water circulation pump 20, the heat storage circulation pump 22, and the heat release circulation pump 23 changes, the opening degrees of the sixteenth valve 47, the seventeenth valve 48, and the eighteenth valve 49 are adjusted to change the steam flow entering the second back pressure machine 15, thereby changing the power generation amount of the second generator 16 to match the power consumption of the power equipment such as the drain circulation pump 19, the heat grid water circulation pump 20, the heat storage circulation pump 22, and the heat release circulation pump 23.

Those not described in detail in this specification are well within the skill of the art.

Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.

Claims

1. A cogeneration system based on coupling of multiple heat sources, comprising: a cogeneration unit (1), a condenser (2), a first type industrial steam user (3), a steam buffer device (4), a steam pressure reducing device (5), a first steam type electrode boiler (6), a power control switch (7), a power grid (8), a second type industrial steam user (9), a first backpressure machine (10), a first generator (11), a second steam type electrode boiler (12), a steam-water mixed heating device (13), a heating user (14), a second backpressure machine (15), a second generator (16), a steam-water heat exchanger (17), a water-water heat exchanger (18), a drainage circulating pump (19), a heat-grid water circulating pump (20), a hot water heat storage device (21), a heat storage circulating pump (22), a heat release circulating pump (23), a photovoltaic power generation device (24), an electric energy storage device (25), an inversion control device (26) and a third steam type electrode boiler (27), the steam exhaust port of the cogeneration unit (1) is connected with the steam inlet of the condenser (2), the industrial steam extraction port of the cogeneration unit (1) is connected with the steam inlet of the industrial steam conveying pipe (71), a first valve (32) is arranged at the industrial steam extraction port of the cogeneration unit (1), the steam outlet of the industrial steam conveying pipe (71) is connected with the steam inlet of the first-class industrial steam user (3), the steam inlet of the first back press (10) and the steam inlet of the second back press (15) through a first industrial steam branch pipe (72), a second industrial steam branch pipe (73) and a third industrial steam branch pipe (74), a third valve (34) is arranged on the first industrial steam branch pipe (72), a seventh valve (38) is arranged on the second industrial steam branch pipe (73), and an eighth valve (39) is arranged at the steam inlet of the first back press (10), a fifteenth valve (46) is installed on a third industrial steam branch pipe (74), a sixteenth valve (47) is installed at a steam inlet of a second back pressure machine (15), a power grid (8) is connected with a first steam type electrode boiler (6) through a power control switch (7), a steam outlet of the first steam type electrode boiler (6) is simultaneously connected with a steam inlet of a steam buffer device (4) and a steam inlet of a steam pressure reducing device (5), a fourth valve (35) is installed at the steam inlet of the steam buffer device (4), a sixth valve (37) is installed at the steam inlet of the steam pressure reducing device (5), a steam outlet of the steam buffer device (4) is connected with a steam inlet of a first type industrial steam user (3), a steam pressure balancing valve (31) is installed at a steam outlet of the steam buffer device (4), and a steam outlet of the steam pressure reducing device (5) is connected with a steam inlet of a first type industrial steam user (3), a fifth valve (36) is installed at a steam outlet of the steam pressure reducing device (5), a steam outlet of the first back press (10) is connected with a steam inlet of a second type of industrial steam user (9), a ninth valve (40) is installed at a steam outlet of the first back press (10), a first steam bypass (75) is arranged between the steam inlet and the steam outlet of the first back press (10), a tenth valve (41) is installed on the first steam bypass (75), the first back press (10) drives a first generator (11) to do work and generate power, electric power generated by the first generator (11) is transmitted to a second steam type electrode boiler (12) to generate steam, a steam outlet of the second steam type electrode boiler (12) is respectively connected with the steam inlet of the second type of industrial steam user (9) and the steam inlet of the mixed heating device (13) through a first steam branch pipe (76) and a second steam branch pipe (77), a twelfth valve (43) is installed on the first steam branch pipe (76), a thirteenth valve (44) is installed on the second steam branch pipe (77), a steam outlet of the second back press (15) is connected with a steam inlet of the steam-water heat exchanger (17), a seventeenth valve (48) is installed on the steam outlet of the second back press (15), a second steam bypass (79) is arranged between the steam inlet and the steam outlet of the second back press (15), an eighteenth valve (49) is installed on the second steam bypass (79), the second back press (15) drives the second generator (16) to do work and generate electricity, a drain outlet of the steam-water heat exchanger (17) is connected with a drain inlet of the water-water heat exchanger (18), a nineteenth valve (50) is installed at a drain outlet of the steam-water heat exchanger (17), a twentieth valve (51) is installed at a drain inlet of the water-water heat exchanger (18), the water-water heat exchanger (18) is characterized in that a water-drainage inlet is connected with a water-drainage outlet of a first type of industrial steam user (3), a water-drainage outlet of a second type of industrial steam user (9) and a high-temperature water outlet of a steam-water mixed heating device (13) through a first water-drainage conveying pipe (78), a thirty-seventh valve (68) is installed at the water-drainage outlet of the first type of industrial steam user (3), an eleventh valve (42) is installed at the water-drainage outlet of the second type of industrial steam user (9), a fourteenth valve (45) is installed at the high-temperature water outlet of the steam-water mixed heating device (13), a water-drainage outlet of the water-water heat exchanger (18) is connected with a water-drainage inlet of a condenser (2) through a second water-drainage conveying pipe (81), a twenty-first valve (52) is installed at the water-drainage outlet of the water-water heat exchanger (18), and a water-drainage circulating pump (19) is installed on the second water-drainage conveying pipe (81), a second valve (33) is arranged at a drain inlet of the condenser (2), a heat supply network water outlet of a heating user (14) is connected with a heat supply network water inlet of the water-water heat exchanger (18) through a heat supply network water return pipe (83), a heat supply network water circulating pump (20) is arranged on the heat supply network water return pipe (83), a twenty-fourth valve (55) is arranged at the heat supply network water inlet of the water-water heat exchanger (18), the heat supply network water outlet of the water-water heat exchanger (18) is connected with a water inlet of the steam-water heat exchanger (17), a twenty-fifth valve (56) is arranged at the heat supply network water outlet of the water-water heat exchanger (18), a twenty-seventh valve (58) is arranged at a water inlet of the steam-water heat exchanger (17), a water outlet of the steam-water heat exchanger (17) is connected with the heat supply network water inlet of the heating user (14) through a heat supply network water supply pipe (84), and a twenty-eighth valve (59) is arranged at a water outlet of the steam-water heat exchanger (17), a twenty-ninth valve (60) is arranged on a heat supply network water supply pipe (84), the heat storage end of the hot water heat storage device (21) is respectively connected with a heat supply network water inlet of the water-water heat exchanger (18) and a water outlet of the steam-water heat exchanger (17) through a first heat storage pipe (86) and a second heat storage pipe (87), a thirty valve (61) and a heat storage circulating pump (22) are arranged on the first heat storage pipe (86), a thirty-first valve (62) is arranged on the second heat storage pipe (87), the heat release end of the hot water heat storage device (21) is respectively connected with a water outlet of the heat supply network water circulating pump (20) and a water inlet end of the heat supply network water supply pipe (84) through a first heat release pipe (88) and a second heat release pipe (89), a thirty-second valve (63) is arranged on the first heat release pipe (88), a thirteen valve (64) and a heat release circulating pump (23) are arranged on the second heat release pipe (89), photovoltaic power generation device (24) are connected with electric energy storage device (25) and third steam type electrode boiler (27) simultaneously through contravariant controlgear (26), electric energy storage device (25) also are connected with third steam type electrode boiler (27) through contravariant controlgear (26), the steam outlet of third steam type electrode boiler (27) passes through third steam branch pipe (90) and fourth steam branch pipe (91) and is connected with the steam inlet of second back pressure machine (15) and the steam inlet of first back pressure machine (10) respectively, and installs thirty-fourth valve (65) at the steam outlet of third steam type electrode boiler (27), installs thirty-fifth valve (66) on third steam branch pipe (90), installs thirty-sixth valve (67) on fourth steam branch pipe (91).

2. The cogeneration system based on coupling of multiple heat sources according to claim 1, wherein the mixed steam-water heating device (13) is a direct contact heat exchanger, and the steam from the second steam type electrode boiler (12) and the externally supplied feed water perform mixed heat exchange in the mixed steam-water heating device (13).

3. A cogeneration system based on coupling of multiple heat sources according to claim 1, characterized in that the water-repellent side of the water-water heat exchanger (18) is provided with a first water-repellent bypass (80), and a twenty-second valve (53) is installed on the first water-repellent bypass (80), the heat supply network water side of the water-water heat exchanger (18) is provided with a heat supply network water bypass (85), and a twenty-sixth valve (57) is installed on the heat supply network water bypass (85).

4. A cogeneration system based on coupling of multiple heat sources according to claim 1, characterized in that a second hydrophobic bypass (82) is provided between the water outlet of the hydrophobic circulation pump (19) and the heat supply network return pipe (83), and a twenty-third valve (54) is installed on the second hydrophobic bypass (82).

5. A cogeneration system based on multi-heat-source coupling according to claim 1, characterized in that the electricity generated by said second generator (16) is used to drive a hydrophobic circulation pump (19), a grid water circulation pump (20), a heat storage circulation pump (22) and a heat release circulation pump (23) to do work, and the electricity generated by said first generator (11) is also used to drive a power plant of a second type of industrial steam consumer (9) to do work.

6. Cogeneration system based on coupling of multiple heat sources according to claim 1, characterized in that said electric energy storage means (25) can be either accumulator energy storage means or capacitor energy storage means.

7. A method for regulating a cogeneration system based on coupling of multiple heat sources according to any one of claims 1 to 6, characterized in that the method for regulating is as follows:

opening and adjusting a first valve (32), supplying industrial steam generated by the cogeneration unit (1) to the outside through an industrial steam conveying pipe (71), and supplying steam to a first type of industrial steam users (3), supplying steam to a second type of industrial steam users (9) and supplying heat to a heating user (14) through a first industrial steam branch pipe (72), a second industrial steam branch pipe (73) and a third industrial steam branch pipe (74);

at the moment, the third valve (34) and the thirty-seventh valve (68) are opened and adjusted, industrial steam from the industrial steam conveying pipe (71) is directly supplied to the first type of industrial steam users (3) for production and use, steam trap generated by the first type of industrial steam users (3) is supplied to the outside through the first trap conveying pipe (78), in addition, a steam pressure balance valve (31), a fourth valve (35), a fifth valve (36) and a sixth valve (37) can be opened and adjusted, the first steam type electrode boiler (6) utilizes the power of a power grid (8) to generate steam through a power control switch (7), when the industrial steam flow from the industrial steam conveying pipe (71) is insufficient, the steam generated by the first steam type electrode boiler (6) supplements the steam supply for the first type of industrial steam users (3) through a steam pressure reducing device (5), when the steam supply pressure of the industrial steam conveying pipe (71) is unstable due to the sudden increase of the steam flow rate of the first type of industrial steam users (3), the steam generated by the first steam type electrode boiler (6) is used for balancing the steam supply pressure for the first type of industrial steam users (3) through the steam buffer device (4);

at the moment, a seventh valve (38), an eighth valve (39), a ninth valve (40), a tenth valve (41) and an eleventh valve (42) are opened and adjusted, industrial steam from an industrial steam conveying pipe (71) enters a first back pressure machine (10) to drive a first generator (11) to do work and generate power, the other part of industrial steam and exhaust steam of the first back pressure machine (10) are conveyed to a second type of industrial steam user (9) together to be supplied to the second type of industrial steam user (9) for production and use, electric power generated by the first generator (11) is supplied to a second steam type electrode boiler (12) to generate steam, and steam drainage generated by the second type of industrial steam user (9) is supplied to the outside through a first drainage conveying pipe (78);

at the moment, a twelfth valve (53), a thirteenth valve (54) and a twenty-sixth valve (57) are closed, a second valve (33), a fifteenth valve (46), a sixteenth valve (47), a seventeenth valve (48), an eighteenth valve (49), a nineteenth valve (50), a twentieth valve (51) and a twenty-first valve (52) are opened and adjusted, industrial steam from an industrial steam conveying pipe (71) enters a second back press (15) firstly, a second generator (16) is driven to work and generate power, the other part of industrial steam and exhaust steam of the second back press (15) are conveyed to a steam-water heat exchanger (17) together to heat mains water, and the power generated by the second generator (16) is used for driving a drainage circulating pump (19), a mains water circulating pump (20), a heat storage circulating pump (22) and a heat release circulating pump (23) to work, the steam drainage from a first type of industrial steam users (3) and the steam drainage from a second type of industrial steam users (9) enter a water-water heat exchanger (18) through a first drainage conveying pipe (78) and the steam drainage formed by a steam-water heat exchanger (17) to heat supply network water, the drainage after being cooled by the water-water heat exchanger (18) returns to a condenser (2) through a second drainage conveying pipe (81) under the driving of a drainage circulating pump (19), a twenty-fourth valve (55), a twenty-fifth valve (56), a twenty-seventh valve (58), a twenty-eighth valve (59) and a twenty-ninth valve (60) are simultaneously opened and adjusted, the heat supply network return water from a heating user (14) is conveyed to the water-water heat exchanger (18) through a heat supply network return pipe (83) under the driving of a heat supply network water circulating pump (20) to be heated for one stage, and then enters the steam-water heat exchanger (17) to be heated for the second stage, the heat supply network water with high temperature is conveyed to a heating user (14) for heating through a heat supply network water supply pipe (84);

at the moment, the photovoltaic power generation device (24) generates power by utilizing solar energy, then the power generated by the photovoltaic power generation device (24) is supplied to a third steam type electrode boiler (27) through an inversion control device (26) to generate steam, and is also supplied to an electric energy storage device (25) to be stored, when the power used by the third steam type electrode boiler (27) for producing the steam is insufficient, the power stored by the electric energy storage device (25) can be supplied to the third steam type electrode boiler (27) through the inversion control device (26) to produce the steam, at the moment, a thirty-fourth valve (65), a thirty-fifth valve (66) and a thirty-sixth valve (67) can be opened and adjusted, and the steam produced by the third steam type electrode boiler (27) is respectively used for supplying the steam for the second type industrial steam users (9) and supplying the heat for the heating users (14) through a fourth steam branch pipe (91) and a third steam branch pipe (90).

8. The method of regulating a cogeneration system based on coupling of multiple heat sources according to claim 7, wherein:

when the cogeneration unit (1) needs to run with a power-increasing load, the running of the cogeneration unit (1) with the power-increasing load can be realized by reducing the flow of industrial steam supplied from the cogeneration unit (1) to the outside, and the running of the cogeneration unit (1) with the power-increasing load can be realized by increasing the running power of the cogeneration unit (1);

if the flow of the industrial steam supplied to the outside by the cogeneration unit (1) is reduced, the following steps are carried out:

the industrial steam flow transmitted to the first type of industrial steam users (3) through the first industrial steam branch pipe (72) can be reduced, at the moment, the power supply control switch (7) is turned on, the first steam type electrode boiler (6) utilizes the power of the power grid (8) to produce steam, the fifth valve (36) and the sixth valve (37) are opened simultaneously, the steam generated by the first steam type electrode boiler (6) enters the steam pressure reducing device (5) to be subjected to pressure reduction, and then is supplied to the first type of industrial steam users (3) to make up the steam flow which is less supplied by the cogeneration unit (1);

the flow rate of the industrial steam which is conveyed to the second type of industrial steam users (9) through the second industrial steam branch pipe (73) can also be reduced, at the moment, on one hand, the twelfth valve (43) is opened to supply the steam generated by the second steam type electrode boiler (12) to the second type of industrial steam users (9) to compensate the low-supply steam flow rate of the cogeneration unit (1), and on the other hand, the thirty-fourth valve (65) and the thirty-sixth valve (67) are opened to supply the steam generated by the third steam type electrode boiler (27) to the second type of industrial steam users (9) to compensate the low-supply steam flow rate of the cogeneration unit (1);

the flow rate of the industrial steam conveyed to the steam-water heat exchanger (17) through the third industrial steam branch pipe (74) can be reduced, at the moment, on one hand, the heat of the steam which is short of supply of the cogeneration unit (1) is compensated by opening a thirty-second valve (63) and a thirty-third valve (64) to release heat to the outside through the hot water heat storage device (21), on the other hand, the steam which is short of supply of the cogeneration unit (1) is compensated by opening a thirty-fourth valve (65) and a thirty-fifth valve (66) to supply the steam which is generated by the third steam type electrode boiler (27) to the steam-water heat exchanger (17);

if the operation power of the cogeneration unit (1) is increased and the flow of the industrial steam externally supplied by the cogeneration unit (1) is increased, then:

the flow of the industrial steam conveyed to the steam-water heat exchanger (17) through the third industrial steam branch pipe (74) can be increased, at the moment, the thirtieth valve (61) and the thirty-first valve (62) are opened and adjusted, the thirty-second valve (63) and the thirty-third valve (64) are closed, and the hot water heat storage device (21) stores heat to absorb the heat which is supplied by the steam-water heat exchanger (17) and the water-water heat exchanger (18) more, so that the industrial steam flow which is supplied by the cogeneration unit (1) more can be absorbed;

the opening degrees of a thirty-fourth valve (65), a thirty-fifth valve (66) and a thirty-sixth valve (67) can be reduced until the valves are closed, the steam flow transmitted to the second type of industrial steam users (9) and the steam-water heat exchanger (17) by the third steam type electrode boiler (27) is reduced until the steam flow is zero, and the opening degrees of a seventh valve (38) and a fifteenth valve (46) are correspondingly increased, so that the steam flow transmitted to the second type of industrial steam users (9) and the steam-water heat exchanger (17) by the cogeneration unit (1) is increased, and the industrial steam flow supplied by the cogeneration unit (1) is consumed;

the opening degree of the fifth valve (36) and the sixth valve (37) can be reduced until the fifth valve is closed, the steam flow transmitted to the first type of industrial steam users (3) by the first steam type electrode boiler (6) is reduced until the steam flow is zero, and the opening degree of the third valve (34) is correspondingly increased, so that the steam flow transmitted to the first type of industrial steam users (3) by the cogeneration unit (1) is increased, and the industrial steam flow supplied by the cogeneration unit (1) is consumed;

when the cogeneration unit (1) needs to operate with reduced power load, the reduced power load operation of the cogeneration unit (1) can be realized by increasing the flow of the industrial steam supplied from the cogeneration unit (1) to the outside, and the reduced power load operation of the cogeneration unit (1) can be realized by reducing the operation power of the cogeneration unit (1);

if the flow of the industrial steam supplied to the outside by the cogeneration unit (1) is increased, the following steps are carried out:

if reducing the running power of the cogeneration unit (1) must be synchronous with reducing the industrial steam flow supplied to the outside by the cogeneration unit (1), then:

the flow rate of the industrial steam conveyed to the steam-water heat exchanger (17) through the third industrial steam branch pipe (74) can be reduced, at the moment, on one hand, the heat of the steam which is less supplied by the combined heat and power generation unit (1) is compensated by utilizing the heat released from the hot water heat storage device (21) through opening the thirty-second valve (63) and the thirty-third valve (64), and on the other hand, the flow rate of the steam which is less supplied by the combined heat and power generation unit (1) is compensated by utilizing the steam generated by the third steam type electrode boiler (27) and supplied to the steam-water heat exchanger (17) through opening the thirty-fourth valve (65) and the thirty-fifth valve (66).

9. The method of regulating a cogeneration system based on coupling of multiple heat sources according to claim 7, wherein:

when the unit steam price provided by the industrial steam conveying pipe (71) is larger than that provided by the first steam type electrode boiler (6), the opening degree of the third valve (34) is reduced until the third valve is closed, the fifth valve (36) and the sixth valve (37) are opened and adjusted, the steam flow rate supplied to the first type of industrial steam users (3) by the first steam type electrode boiler (6) is increased, and the steam flow rate supplied to the first type of industrial steam users (3) by the industrial steam conveying pipe (71) is reduced until the steam flow rate is zero;

when the unit steam price provided by the industrial steam conveying pipe (71) is less than that provided by the first steam type electrode boiler (6), the opening degrees of the fifth valve (36) and the sixth valve (37) are reduced until the unit steam price is closed, the third valve (34) is opened and adjusted, the steam flow rate of the industrial steam conveying pipe (71) supplied to the first type of industrial steam users (3) is increased, and the steam flow rate of the first steam type electrode boiler (6) supplied to the first type of industrial steam users (3) is reduced until the steam flow rate is zero;

when the price of the unit steam heat provided by the second steam type electrode boiler (12) to the water-water heat exchanger (18) is larger than the price of the unit steam heat provided by the industrial steam conveying pipe (71) to the second type of industrial steam users (9), the twelfth valve (43) is closed, the thirteenth valve (44) and the fourteenth valve (45) are opened, the steam from the second steam type electrode boiler (12) and externally supplied feed water are subjected to mixed heat exchange in the steam-water mixed heating device (13) to form hot water, and then the hot water is supplied to the water-water heat exchanger (18) through the first drainage conveying pipe (78) to supply heat to the heating users (14);

when the price per unit steam heat provided by the second steam type electrode boiler (12) to the water-water heat exchanger (18) is less than the price per unit steam heat provided by the industrial steam conveying pipe (71) to the second type of industrial steam users (9), the thirteenth valve (44) and the fourteenth valve (45) are closed, the twelfth valve (43) is opened, and the steam from the second steam type electrode boiler (12) is directly provided for the second type of industrial steam users (9);

when the unit steam price provided by the industrial steam conveying pipe (71) is larger than that provided by the third steam type electrode boiler (27), the opening degrees of the seventh valve (38) and the fifteenth valve (46) are reduced until the seventh valve is closed, the thirty-fourth valve (65), the thirty-fifth valve (66) and the thirty-sixth valve (67) are opened and adjusted, the steam flow rate supplied to the second type of industrial steam users (9) and the steam-water heat exchanger (17) by the third steam type electrode boiler (27) is increased, and the steam flow rate supplied to the second type of industrial steam users (9) and the steam-water heat exchanger (17) by the industrial steam conveying pipe (71) is reduced until the steam flow rate is zero;

when the unit steam price provided by the industrial steam conveying pipe (71) is less than that provided by the third steam type electrode boiler (27), the opening degrees of a thirty-fourth valve (65), a thirty-fifth valve (66) and a thirty-sixth valve (67) are reduced until the valve is closed, a seventh valve (38) and a fifteenth valve (46) are opened and adjusted, the steam flow rate supplied to the second type of industrial steam users (9) and the steam-water heat exchanger (17) by the industrial steam conveying pipe (71) is increased, and the steam flow rate supplied to the second type of industrial steam users (9) and the steam-water heat exchanger (17) by the third steam type electrode boiler (27) is reduced until the steam flow rate is zero.

10. The method of regulating a cogeneration system based on coupling of multiple heat sources according to claim 7, wherein:

when the steam flow rate for the first type of industrial steam users (3) to use in production is suddenly increased, the steam pressure supplied through the first industrial steam branch pipe (72) is fluctuated, and at the moment, the steam flow rate which needs to be suddenly increased for the first type of industrial steam users (3) to use in production is made up by the steam buffer device (4) through the action of the steam pressure balance valve (31), so that the steam pressure supplied to the first type of industrial steam users (3) is ensured to be stable;

when the return water pressure of the heat supply network from the heating user (14) is low, a twenty-third valve (54) is opened, a second valve (33) is closed, and the drain water from the water-water heat exchanger (18) is driven by a drain water circulating pump (19) to be conveyed to a return water pipe (83) of the heat supply network through a second drain water bypass (82), so that water supplementing and pressure stabilizing are carried out on the heating system of the heating user (14);

when the power consumption of the drainage circulating pump (19), the heat supply network water circulating pump (20), the heat storage circulating pump (22) and the heat release circulating pump (23) is changed, the opening degrees of a sixteenth valve (47), a seventeenth valve (48) and an eighteenth valve (49) are adjusted, the steam flow entering the second back press machine (15) is changed, and therefore the power generation amount of the second generator (16) is changed to match the power consumption of the drainage circulating pump (19), the heat supply network water circulating pump (20), the heat storage circulating pump (22) and the heat release circulating pump (23).