CN113587176A

CN113587176A - Clean heat supply system with steam extraction coupling solar energy of thermoelectric unit and operation method

Info

Publication number: CN113587176A
Application number: CN202110834944.9A
Authority: CN
Inventors: 王永贞; 候封校; 寇学森; 尹国安; 张斌
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 clean heat supply system and an operation method for steam extraction coupling solar energy of a thermoelectric unit, 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, a steam type electrode boiler, a steam-water mixed heating device, a hot water type electrode boiler, 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, inversion control equipment and an electric energy storage device. The invention meets the diversified and multi-grade heat demand of users by the high-efficiency integration of the cogeneration steam supply and heating, realizes the cascade utilization of energy, develops the power peak regulation capability of the cogeneration system and has wide market application prospect.

Description

Clean heat supply system with steam extraction coupling solar energy of thermoelectric unit and operation method

Technical Field

The invention belongs to the technical field of cogeneration, and particularly relates to a clean heat supply system with steam extraction and solar energy coupling of a thermoelectric unit and an operation method thereof, which are particularly suitable for a 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 heat and power cogeneration steam supply flow and the heating flow with high efficiency, the steam pipe network is used for heating users, the photovoltaic power generation is used for producing hot water to make up for the heat supply of the cogeneration unit, and the heat storage device is used for making up for the difference of electric heating load in time and space, thereby meeting the peak regulation requirement of the cogeneration unit, simultaneously recycling the residual energy at the steam user side in the aspect of energy saving to meet the power demand of the electric equipment and the heating demand of the heating user, therefore, the investment cost of the cogeneration centralized heating system is reduced, the power peak regulation capacity of the cogeneration system is improved, diversified and multi-grade heating requirements are met, the energy is recycled in a gradient manner by recycling the residual energy, the policy development requirement of national energy transformation is met, and the market application prospect is wide.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a clean heating system which is reasonable in design, reliable in performance and used for steam extraction coupling solar energy of a thermoelectric unit and an operation method.

The technical scheme adopted by the invention for solving the problems is as follows: the utility model provides a clean heating system of thermoelectric unit extraction coupling solar energy which characterized in that includes: the steam outlet of the cogeneration unit is connected with the steam inlet of the condenser, the industrial steam outlet of the cogeneration unit is connected with the steam inlet of the industrial steam conveying pipe, a first valve is arranged at the industrial steam outlet of the cogeneration unit, the steam outlet of the industrial steam conveying pipe is respectively connected with the steam inlet of the first back pressing machine and the steam inlet of the second back pressing machine through a first industrial steam branch pipe and a second industrial steam branch pipe, a third valve is arranged on the first industrial steam branch pipe, a fourth valve is arranged at a steam inlet of the first back press, a twelfth valve is arranged at a steam inlet of the second back press, a steam outlet of the first back press is connected with a steam inlet of an industrial steam user, a fifth valve is arranged at a 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 sixth valve is arranged on the first steam bypass, the first back press drives a first generator to do work to generate power, the power generated by the first generator is transmitted to a steam type electrode boiler to generate steam, a steam outlet of the steam type electrode boiler is respectively connected with the steam inlet of the industrial steam user and the steam inlet of the steam-water mixed heating device through the first steam branch pipe and the second steam branch pipe, and an eighth valve is arranged on the first steam branch pipe, a ninth valve is installed on the second steam branch pipe, a steam outlet of the second back press machine is connected with a steam inlet of the steam-water heat exchanger, a thirteenth valve is installed on the steam outlet of the second back press machine, a second steam bypass is arranged between the steam inlet and the steam outlet of the second back press machine, a fourteenth valve is installed on the second steam bypass, the second back press machine drives a second generator to do work and generate electricity, a drain outlet of the steam-water heat exchanger is connected with a drain inlet of the water-water heat exchanger, a fifteenth valve is installed on the drain outlet of the steam-water heat exchanger, a sixteenth valve is installed on a drain inlet of the water-water heat exchanger, the drain inlet of the water-water heat exchanger is also connected with a drain outlet of an industrial steam user and a high-temperature water outlet of the steam-water mixed heating device through a first drain conveying pipe, and an eleventh valve is installed on the first drain conveying pipe, a seventh valve is arranged at a drain outlet of an industrial steam user, a tenth valve is arranged at a high-temperature water outlet of the steam-water mixed heating device, a drain outlet of the water-water heat exchanger is connected with a drain inlet of the condenser through a second drain conveying pipe, a seventeenth valve is arranged at a drain outlet of the water-water heat exchanger, a drain circulating pump is arranged on the second drain conveying pipe, a second valve is arranged at a drain inlet of the condenser, a heat supply network water outlet of a heating user is connected with a heat supply network water inlet of the water-water heat exchanger through a heat supply network water return pipe, a heat supply network water circulating pump is arranged on the heat supply network water return pipe, a twentieth valve is arranged at the 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-first valve is arranged at the heat supply network water outlet of the water-water heat exchanger, and a twenty-thirteen valve is arranged at a water inlet of the steam-water heat exchanger, the 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-fourth valve is installed at the water outlet of the steam-water heat exchanger, a twenty-fifth valve is installed 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 twenty-sixth valve and a heat storage circulating pump are installed on the first heat storage pipe, a twenty-seventh valve is installed on the second heat storage pipe, a heat release end of the hot water heat storage device is respectively connected with a water outlet of the heat supply network water circulating pump and a water inlet end of the heat supply network water supply pipe through a first heat release pipe and a second heat release pipe, a twenty-eighth valve is installed on the first heat release pipe, a twenty-ninth valve and a heat release circulating pump are installed on the second heat release pipe, and the photovoltaic power generation device is simultaneously connected with the electric energy storage device and the hot water type electrode boiler through an inversion control device The electric energy storage device is also connected with the hot water type electrode boiler through the inversion control equipment, a hot water outlet of the hot water type electrode boiler is connected with a drainage inlet of the water-water heat exchanger through a high-temperature water branch pipe, and a thirtieth valve is installed at a hot water outlet of the hot water type electrode boiler.

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

Furthermore, the hydrophobic side of water-water heat exchanger is provided with first hydrophobic bypass, and installs the eighteenth valve on first hydrophobic bypass, the heat supply network water side of water-water heat exchanger is provided with heat supply network water bypass, and installs the twelfth valve on 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 nineteenth 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 an 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 operation method of the clean heat supply system with the steam extraction coupling solar energy of the thermoelectric unit comprises 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 industrial steam users and supplying heat to heating users through the first industrial steam branch pipe and the second industrial steam branch pipe respectively;

at the moment, opening and adjusting a third valve, a fourth valve, a fifth valve, a sixth valve and a seventh 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 industrial steam users together for the industrial steam users to produce and use, electric power generated by the first generator is supplied to a steam type electrode boiler to generate steam, and steam drain generated by the industrial steam users is supplied to the outside through a first drain conveying pipe;

at the moment, an eighteenth valve, a nineteenth valve and a twentieth valve are closed, a second valve, an eleventh valve, a twelfth valve, a thirteenth valve, a fourteenth valve, a fifteenth valve, a sixteenth valve and a seventeenth valve are opened and adjusted, industrial steam from an industrial steam conveying pipe enters a second backpressure machine firstly to drive a second generator to do work and generate power, the other part of industrial steam and exhaust steam of the second backpressure machine are conveyed to a steam-water heat exchanger together to heat network water, electric power generated by the second generator is used for driving power equipment such as a drainage circulating pump, a network water circulating pump, a heat storage circulating pump, a heat release circulating pump and the like to do work, steam drainage from industrial steam users enters a water-water heat exchanger together with steam drainage formed by the steam-water heat exchanger through the first drainage conveying pipe to heat the network water, the drainage cooled by the water-water heat exchanger returns to a condenser through the second drainage conveying pipe under the driving of the drainage circulating pump, opening and adjusting a twentieth valve, a twenty-first valve, a twenty-third valve, a twenty-fourth valve and a twenty-fifth valve simultaneously, conveying return water of a heat supply network from a heating user to a water-water heat exchanger through a return water pipe of the heat supply network under the driving of a water circulating pump of the heat supply network to be heated by a first stage, then conveying the return water into a steam-water heat exchanger to be heated by a second stage, and conveying the formed high-temperature water of the heat supply network to the heating user through a water supply pipe of the heat supply network to be heated;

at the moment, the thirtieth valve is opened and adjusted, 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 hot water type electrode boiler through the inversion control equipment to generate high-temperature hot water and is also supplied to the electric energy storage device to be stored, at the moment, when the power used for generating the hot water by the hot water type electrode boiler is insufficient, the power stored by the electric energy storage device can also be supplied to the hot water type electrode boiler through the inversion control equipment to generate the high-temperature hot water, and the high-temperature hot water generated by the hot water type electrode boiler is conveyed to the water-water heat exchanger to heat the hot network water.

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:

on one hand, the flow of the industrial steam conveyed to the industrial steam user through the first industrial steam branch pipe is reduced, and at the moment, the steam generated by the steam type electrode boiler can be supplied to the industrial steam user by opening the eighth valve to make up the low-supply steam flow of the cogeneration unit;

on the other hand, the flow of the industrial steam conveyed to the steam-water heat exchanger through the second industrial steam branch pipe is reduced, at the moment, the heat of the steam which is less supplied by the cogeneration unit can be made up by opening the twenty-eighth valve and the twenty-ninth valve to release heat to the outside by using the hot water heat storage device, and the heat of the steam which is less supplied by the cogeneration unit can be made up by opening the thirty-eighth valve and the twenty-ninth valve to supply high-temperature hot water generated by the hot water type electrode boiler to the water-water heat exchanger;

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:

on one hand, the flow of the industrial steam conveyed to the steam-water heat exchanger through the second industrial steam branch pipe is increased, at the moment, the twenty-sixth valve and the twenty-seventh valve are opened and adjusted, the twenty-eighth valve and the twenty-ninth valve are closed, the hot water heat storage device can be used for storing heat to absorb the heat which is supplied by the steam-water heat exchanger and the water-water heat exchanger, so that the steam heat which is supplied by the cogeneration unit is absorbed, the opening degrees of the tenth valve, the eleventh valve and the thirtieth valve are reduced until the valves are closed, and the heat which is supplied by the steam-water mixed heating device and the hot water type electrode boiler to the water-water heat exchanger can be reduced to replace the steam heat which is supplied by the cogeneration unit;

on the other hand, the flow of the industrial steam conveyed to the industrial steam user through the first industrial steam branch pipe is increased, at the moment, the opening degree of the eighth valve is reduced until the eighth valve is closed, the flow of the steam conveyed to the industrial steam user by the steam type electrode boiler is reduced to replace the flow of the steam which is supplied by the cogeneration unit, and the electric power generated by the first generator is used for driving power equipment of the industrial steam user to do work.

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:

on the other hand, the flow of the industrial steam conveyed to the industrial steam user through the first industrial steam branch pipe is increased, at the moment, the opening degree of the eighth valve is reduced until the eighth valve is closed, the flow of the steam conveyed to the industrial steam user by the steam type electrode boiler is reduced to replace the steam flow supplied by the cogeneration unit, and the electric power generated by the first generator is used for driving power equipment of the industrial steam user to do work;

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:

on the other hand, the flow rate of the industrial steam conveyed to the steam-water heat exchanger through the second industrial steam branch pipe is reduced, at the moment, the heat of the steam which is less supplied by the cogeneration unit can be made up by opening the twenty-eighth valve and the twenty-ninth valve to release heat to the outside through the hot water heat storage device, and the heat of the steam which is less supplied by the cogeneration unit can also be made up by opening the thirty-eighth valve to supply high-temperature hot water generated by the hot water type electrode boiler to the water-water heat exchanger.

Furthermore, when the price of the unit steam heat provided by the steam type electrode boiler to the water-water heat exchanger is larger than the price of the unit steam heat provided by the industrial steam conveying pipe to the industrial steam user, the eighth valve is closed, the ninth valve, the tenth valve and the eleventh valve are opened, the steam from the steam type electrode boiler and the externally supplied feed water are mixed and exchanged heat 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 user.

Furthermore, when the price of the unit steam heat provided by the 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 an industrial steam user, the ninth valve and the tenth valve are closed, the eighth valve is opened, and the steam from the steam type electrode boiler is directly provided to the industrial steam user for use.

Furthermore, when the unit heat price provided by the industrial steam delivery pipe is greater than that provided by the hot water type electrode boiler, the opening degrees of the twelfth valve and the fourteenth valve are reduced until the twelfth valve and the fourteenth valve are closed, the thirtieth valve is opened and adjusted, the hot water flow rate of the hot water type electrode boiler supplied water-water heat exchanger is increased, and the steam flow rate of the industrial steam delivery pipe supplied to the steam-water heat exchanger is reduced until the steam flow rate is zero.

Furthermore, when the unit heat price provided by the industrial steam delivery pipe is less than that provided by the hot water type electrode boiler, the opening degree of the thirtieth valve is reduced until the thirtieth valve is closed, the twelfth valve and the fourteenth valve are opened and adjusted, the steam flow supplied to the steam-water heat exchanger by the industrial steam delivery pipe is increased, and the hot water flow supplied to the water-water heat exchanger by the hot water type electrode boiler is reduced until the hot water flow is zero.

Furthermore, when the return water pressure of the heating network from the heating user is low, the nineteenth valve is opened, the second valve is closed, 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, and water supplementing and pressure stabilizing are carried out 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 twelfth valve, thirteenth valve and fourteenth 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 drainage circulating pump, heat supply network water circulating pump, heat storage circulating pump and 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 coupling of diversified energy demands of heating users and steam users is utilized, the photovoltaic power generation is utilized to produce hot water to make up the space-time difference of the heat supply of the unit and the heat storage device is utilized to make up the space-time difference of the electric heating load of the unit, so that 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 national energy transformation policy development demands are met, and the solar energy combined heat and power generation system has a wide market application prospect.

Drawings

Fig. 1 is a system schematic diagram of a clean heating system and an operation method of a thermoelectric unit steam extraction coupling solar energy in an embodiment of the invention.

In the figure: 1-cogeneration unit, 2-condenser, 3-industrial steam user, 4-first back press, 5-first generator, 6-steam type electrode boiler, 7-steam-water mixed heating device, 8-heating user, 9-second back press, 10-second generator, 11-steam-water heat exchanger, 12-water heat exchanger, 13-hydrophobic circulating pump, 14-heat network water circulating pump, 15-hot water heat storage device, 16-heat storage circulating pump, 17-heat release circulating pump, 18-photovoltaic power generation device, 19-electric energy storage device, 20-inversion control equipment, 21-hot water type electrode boiler, 31-first valve, 32-second valve, 33-third valve, 34-fourth valve, 35-fifth valve, 36-sixth valve, 37-seventh valve, 38-eighth valve, 39-ninth valve, 40-tenth valve, 41-eleventh valve, 42-twelfth valve, 43-thirteenth valve, 44-fourteenth valve, 45-fifteenth valve, 46-sixteenth valve, 47-seventeenth valve, 48-eighteenth valve, 49-nineteenth valve, 50-twentieth valve, 51-twenty-first valve, 52-twenty-second valve, 53-thirteenth valve, 54-twenty-fourth valve, 55-twenty-fifth valve, 56-twenty-sixth valve, 57-twenty-seventh valve, 58-twenty-eighth valve, 59-twenty-ninth valve, 60-thirty valve, 61-thirty-third valve, 71-an industrial steam delivery pipe, 72-a first industrial steam branch pipe, 73-a second industrial steam branch pipe, 74-a first steam bypass, 75-a first steam branch pipe, 76-a second steam branch pipe, 77-a first hydrophobic delivery pipe, 78-a second steam bypass, 79-a first hydrophobic bypass, 80-a second hydrophobic delivery pipe, 81-a second hydrophobic bypass, 82-a heat supply network return pipe, 83-a heat supply network water supply pipe, 84-a heat supply network water bypass, 85-a first heat storage pipe, 86-a second heat storage pipe, 87-a first heat release pipe, 88-a second heat release pipe and 89-a high-temperature water 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 this embodiment, a clean heating system of a thermoelectric generator set for steam extraction and solar energy coupling includes: the system comprises a cogeneration unit 1, a condenser 2, an industrial steam user 3, a first back press 4, a first generator 5, a steam type electrode boiler 6, a steam-water mixed heating device 7, a heating user 8, a second back press 9, a second generator 10, a steam-water heat exchanger 11, a water-water heat exchanger 12, a drain circulating pump 13, a heat supply network water circulating pump 14, a hot water heat storage device 15, a heat storage circulating pump 16, a heat release circulating pump 17, a photovoltaic power generation device 18, an electric energy storage device 19, an inversion control device 20 and a hot water type electrode boiler 21, 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 31 is installed at the industrial steam outlet of the cogeneration unit 1, and a steam outlet of the industrial steam conveying pipe 71 is respectively connected with a steam inlet of the first back press 4 and a steam inlet of the second back press 9 through a first industrial steam branch pipe 72 and a second industrial steam branch pipe 73 The ports are connected, a third valve 33 is installed on a first industrial steam branch pipe 72, a fourth valve 34 is installed on a steam inlet of a first back press 4, a twelfth valve 42 is installed on a steam inlet of a second back press 9, a steam outlet of the first back press 4 is connected with a steam inlet of an industrial steam user 3, a fifth valve 35 is installed on a steam outlet of the first back press 4, a first steam bypass 74 is arranged between the steam inlet and the steam outlet of the first back press 4, a sixth valve 36 is installed on the first steam bypass 74, the first back press 4 drives a first generator 5 to do work and generate electricity, the electricity generated by the first generator 5 is transmitted to a steam type electrode boiler 6 to generate steam, a steam outlet of the steam type electrode boiler 6 is respectively connected with the steam inlet of the industrial steam user 3 and the steam inlet of a steam-water mixed heating device 7 through a first steam branch pipe 75 and a second steam branch pipe 76, an eighth valve 38 is installed on the first steam branch pipe 75, a ninth valve 39 is installed on the second steam branch pipe 76, a steam outlet of the second back press 9 is connected with a steam inlet of the steam-water heat exchanger 11, a thirteenth valve 43 is installed on the steam outlet of the second back press 9, a second steam bypass 78 is arranged between the steam inlet and the steam outlet of the second back press 9, a fourteenth valve 44 is installed on the second steam bypass 78, the second back press 9 drives the second generator 10 to do work and generate power, a drain outlet of the steam-water heat exchanger 11 is connected with a drain inlet of the water-water heat exchanger 12, a fifteenth valve 45 is installed on the drain outlet of the steam-water heat exchanger 11, a drain inlet of the water-water heat exchanger 12 is provided with a sixteenth valve 46, the drain inlet of the water-water heat exchanger 12 is also simultaneously connected with a drain outlet of the industrial steam user 3 and a high-temperature water outlet of the steam-water mixed heating device 7 through a first drain conveying pipe 77, an eleventh valve 41 is installed on the first drain delivery pipe 77, a seventh valve 37 is installed at the drain outlet of the industrial steam user 3, a tenth valve 40 is installed at the high-temperature water outlet of the steam-water mixing and heating device 7, the drain outlet of the water-water heat exchanger 12 is connected with the drain inlet of the condenser 2 through the second drain delivery pipe 80, a seventeenth valve 47 is installed at the drain outlet of the water-water heat exchanger 12, a drain circulating pump 13 is installed on the second drain delivery pipe 80, a second valve 32 is installed at the drain inlet of the condenser 2, the heat supply network water outlet of the heating user 8 is connected with the heat supply network water inlet of the water-water heat exchanger 12 through a heat supply network water return pipe 82, a heat supply network water circulating pump 14 is installed on the heat supply network water return pipe 82, a twentieth valve 50 is installed at the heat supply network water inlet of the water-water heat exchanger 12, the heat supply network water outlet of the water-water heat exchanger 12 is connected with the water inlet of the steam-water heat exchanger 11, a twenty-first valve 51 is installed at a heat supply network water outlet of the water-water heat exchanger 12, a twenty-third valve 53 is installed at a water inlet of the steam-water heat exchanger 11, a water outlet of the steam-water heat exchanger 11 is connected with a heat supply network water inlet of a heating user 8 through a heat supply network water supply pipe 83, a twenty-fourth valve 54 is installed at a water outlet of the steam-water heat exchanger 11, a twenty-fifth valve 55 is installed on the heat supply network water supply pipe 83, a heat storage end of the hot water heat storage device 15 is respectively connected with the heat supply network water inlet of the water-water heat exchanger 12 and the water outlet of the steam-water heat exchanger 11 through a first heat storage pipe 85 and a second heat storage pipe 86, a twenty-sixth valve 56 and a heat storage circulating pump 16 are installed on the first heat storage pipe 85, a twenty-seventh valve 57 is installed on the second heat storage pipe 86, a heat release end of the hot water heat storage device 15 is respectively connected with a water outlet of the heat supply network water circulating pump 14 and a water inlet end of the heat supply network water supply pipe 83 through the first heat release pipe 87 and the second heat release pipe 88, and a twenty-eighth valve 58 is installed on the first heat release pipe 87, a twenty-ninth valve 59 and a heat release circulating pump 17 are installed on the second heat release pipe 88, the photovoltaic power generation device 18 is simultaneously connected with the electric energy storage device 19 and the hot water type electrode boiler 21 through the inversion control device 20, the electric energy storage device 19 is also connected with the hot water type electrode boiler 21 through the inversion control device 20, a hot water outlet of the hot water type electrode boiler 21 is connected with a drain inlet of the water-water heat exchanger 12 through a high-temperature water branch pipe 89, and a thirty-sixth valve 60 is installed on a hot water outlet of the hot water type electrode boiler 21.

In this embodiment, the steam-water mixing and heating device 7 is a direct contact heat exchanger, and steam from the steam electrode boiler 6 and externally supplied feed water are subjected to mixing heat exchange in the steam-water mixing and heating device 7.

In this embodiment, the first drain bypass 79 is provided on the drain side of the water-water heat exchanger 12, the eighteenth valve 48 is installed on the first drain bypass 79, the network water bypass 84 is provided on the network water side of the water-water heat exchanger 12, and the twentieth valve 52 is installed on the network water bypass 84.

In this embodiment, a second hydrophobic bypass 81 is provided between the water outlet of the hydrophobic circulating pump 13 and the heat supply network water return pipe 82, and a nineteenth valve 49 is installed on the second hydrophobic bypass 81.

In this embodiment, the electric power generated by the second generator 10 is used to drive the drain circulation pump 13, the heat supply network water circulation pump 14, the heat storage circulation pump 16 and the heat release circulation pump 17 to do work, and the electric power generated by the first generator 5 is also used to drive the power equipment of the industrial steam consumer 3 to do work.

In this embodiment, the electrical energy storage device 19 may be a storage battery energy storage device or a capacitor energy storage device.

In this embodiment, the operation method of the clean heating system with the steam extraction and solar energy coupling of the thermoelectric unit is as follows:

opening and adjusting the first valve 31, 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 industrial steam users 3 and heating the heating users 8 through the first industrial steam branch pipe 72 and the second industrial steam branch pipe 73, respectively;

at this time, the third valve 33, the fourth valve 34, the fifth valve 35, the sixth valve 36 and the seventh valve 37 are opened and adjusted, industrial steam from the industrial steam conveying pipe 71 enters the first back press 4 to drive the first generator 5 to do work and generate power, another part of industrial steam and exhaust steam of the first back press 4 are conveyed to the industrial steam users 3 together for the industrial steam users 3 to produce and use, electric power generated by the first generator 5 is supplied to the steam type electrode boiler 6 to generate steam, and steam drain water generated by the industrial steam users 3 is supplied to the outside through the first drain conveying pipe 77;

at this time, the eighteenth valve 48, the nineteenth valve 49 and the twentieth valve 52 are closed, the second valve 32, the eleventh valve 41, the twelfth valve 42, the thirteenth valve 43, the fourteenth valve 44, the fifteenth valve 45, the sixteenth valve 46 and the seventeenth valve 47 are opened and adjusted, the industrial steam from the industrial steam conveying pipe 71 enters the second back press 9 firstly, one part of the industrial steam drives the second generator 10 to do work and generate power, the other part of the industrial steam is conveyed to the steam-water heat exchanger 11 together with the exhaust steam of the second back press 9 to heat the heat supply network water, the power generated by the second generator 10 is used for driving power equipment such as the drainage circulating pump 13, the heat supply network water circulating pump 14, the heat storage circulating pump 16 and the heat release circulating pump 17 to do work, the steam drainage from the industrial steam user 3 enters the water-water heat exchanger 12 together with the steam drainage formed by the steam-water heat exchanger 11 through the first drainage conveying pipe 77 to heat the heat supply network water, the drain water cooled by the water-water heat exchanger 12 is driven by the drain circulating pump 13 to return to the condenser 2 through the second drain conveying pipe 80, the twentieth valve 50, the twenty-first valve 51, the twenty-third valve 53, the twenty-fourth valve 54 and the twenty-fifth valve 55 are opened and adjusted at the same time, the return water of the heat supply network from the heating users 8 is driven by the heat supply network water circulating pump 14 to be conveyed to the water-water heat exchanger 12 through the heat supply network return water pipe 82 to be heated by the first stage, then enters the steam-water heat exchanger 11 to be heated by the second stage, and then the high-temperature heat supply network water is conveyed to the heating users 8 through the heat supply network water supply pipe 83 to be heated;

at this time, the thirtieth valve 60 is opened and adjusted, the photovoltaic power generation apparatus 18 generates power by using solar energy, then the power generated by the photovoltaic power generation apparatus 18 is supplied to the hot water type electrode boiler 21 via the inverter control device 20 to generate high temperature hot water, and is also supplied to the electrical energy storage device 19 to be stored, at this time, when the power used by the hot water type electrode boiler 21 to generate hot water is insufficient, the power stored by the electrical energy storage device 19 may also be supplied to the hot water type electrode boiler 21 via the inverter control device 20 to generate high temperature hot water, and the high temperature hot water generated by the hot water type electrode boiler 21 is delivered to the water-water heat exchanger 12 to heat the hot network water.

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:

on the one hand, the flow rate of the industrial steam delivered to the industrial steam consumer 3 through the first industrial steam branch pipe 72 is reduced, and at this time, the steam generated by the steam type electrode boiler 6 can be supplied to the industrial steam consumer 3 by opening the eighth valve 38, so as to compensate the low-supply steam flow rate of the cogeneration unit 1;

on the other hand, the flow rate of the industrial steam delivered to the steam-water heat exchanger 11 through the second industrial steam branch pipe 73 is reduced, and at this time, the steam heat which is less supplied to the cogeneration unit 1 can be compensated by opening the twenty-eighth valve 58 and the twenty-ninth valve 59 to release heat to the outside by the hot water heat storage device 15, and the steam heat which is less supplied to the cogeneration unit 1 can be compensated by opening the thirtieth valve 60 to supply the high-temperature hot water generated by the hot water type electrode boiler 21 to the water-water heat exchanger 12;

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:

on one hand, the flow rate of the industrial steam which is conveyed to the steam-water heat exchanger 11 through the second industrial steam branch pipe 73 is increased, at this time, the twenty-sixth valve 56 and the twenty-seventh valve 57 are opened and adjusted, the twenty-eighth valve 58 and the twenty-ninth valve 59 are closed, the hot water heat storage device 15 can be used for storing heat to consume the heat which is supplied by the steam-water heat exchanger 11 and the water-water heat exchanger 12, so that the heat of the steam which is supplied by the cogeneration unit 1 is consumed, and the opening degrees of the tenth valve 40, the eleventh valve 41 and the thirty-third valve 60 are reduced until the valves are closed, so that the heat which is supplied by the steam-water mixing heating device 7 and the hot water type electrode boiler 21 to the water-water heat exchanger 12 can be reduced to replace the heat of the steam which is supplied by the cogeneration unit 1;

on the other hand, the flow rate of the industrial steam delivered to the industrial steam consumer 3 through the first industrial steam branch pipe 72 is increased, at this time, the opening degree of the eighth valve 38 is reduced until the eighth valve is closed, the flow rate of the steam delivered to the industrial steam consumer 3 by the steam type electrode boiler is reduced, instead of the flow rate of the steam which is supplied by the cogeneration unit 1, and the electric power generated by the first generator 5 is used for driving the power equipment of the industrial steam consumer 3 to do work.

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:

on the other hand, the flow rate of the industrial steam delivered to the industrial steam consumer 3 through the first industrial steam branch pipe 72 is increased, at this time, the opening degree of the eighth valve 38 is reduced until the eighth valve is closed, the flow rate of the steam delivered to the industrial steam consumer 3 by the steam type electrode boiler is reduced, the steam flow rate which is supplied by the cogeneration unit 1 for more is replaced, and the electric power generated by the first generator 5 is used for driving the power equipment of the industrial steam consumer 3 to do work;

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:

on the other hand, the flow rate of the industrial steam to be sent to the steam-water heat exchanger 11 through the second industrial steam branch pipe 73 is reduced, and in this case, the steam heat that is less supplied to the cogeneration unit 1 may be compensated by opening the twenty-eighth valve 58 and the twenty-ninth valve 59 to release heat to the outside by the hot water heat storage device 15, or the steam heat that is less supplied to the cogeneration unit 1 may be compensated by opening the thirtieth valve 60 to supply the high-temperature hot water generated by the hot water type electrode boiler 21 to the water-water heat exchanger 12.

In the load adjustment method of this embodiment, when the price per unit steam heat supplied to the water-water heat exchanger 12 by the steam electrode boiler 6 is larger than the price per unit steam heat supplied to the industrial steam consumer 3 by the industrial steam delivery pipe 71, the eighth valve 38 is closed, the ninth valve 39, the tenth valve 40, and the eleventh valve 41 are opened, and the steam from the steam electrode boiler 6 and the externally supplied feed water are mixed and exchanged in the steam-water mixing and heating device 7 to form hot water, and then the hot water is supplied to the water-water heat exchanger 12 through the first drain delivery pipe 77 to heat the heating consumer 8.

In the load adjustment method of the embodiment, when the price per unit of steam heat provided by the steam electrode boiler 6 to the water-water heat exchanger 12 is less than the price per unit of steam heat provided by the industrial steam delivery pipe 71 to the industrial steam consumer 3, the ninth valve 39 and the tenth valve 40 are closed, the eighth valve 38 is opened, and the steam from the steam electrode boiler 6 is directly provided to the industrial steam consumer 3 for use.

In the load adjustment method of the embodiment, when the price per unit of heat provided by the industrial steam delivery pipe 71 is greater than the price per unit of heat provided by the hot water type electrode boiler 21, the opening degrees of the twelfth valve 42 and the fourteenth valve 44 are reduced until the valves are closed, the thirtieth valve 60 is opened and adjusted, the flow rate of the hot water supplied to the water-water heat exchanger 12 by the hot water type electrode boiler 21 is increased, and the flow rate of the steam supplied to the steam-water heat exchanger 11 by the industrial steam delivery pipe 71 is reduced until the flow rate is zero.

In the load adjustment method of the embodiment, when the price per unit heat provided by the industrial steam delivery pipe 71 is less than the price per unit heat provided by the hot water type electrode boiler 21, the opening degree of the thirtieth valve 60 is reduced until the thirtieth valve is closed, the twelfth valve 42 and the fourteenth valve 44 are opened and adjusted, the steam flow rate supplied to the steam-water heat exchanger 11 by the industrial steam delivery pipe 71 is increased, and the hot water flow rate supplied to the water-water heat exchanger 12 by the hot water type electrode boiler 21 is reduced until the hot water flow rate is zero.

In the load adjustment method of the embodiment, when the return water pressure of the heating network from the heating user 8 is low, the nineteenth valve 49 is also opened, the second valve 32 is closed, and the drain water from the water-water heat exchanger 12 is driven by the drain water circulating pump 13 to be conveyed to the return water pipe 82 of the heating network through the second drain bypass 81, so that water supplementing and pressure stabilizing are performed on the heating system of the heating user 8.

In the load adjustment method of the present embodiment, when the power consumption amounts of the drain circulation pump 13, the grid water circulation pump 14, the heat storage circulation pump 16, and the heat release circulation pump 17 change, the opening degrees of the twelfth valve 42, the thirteenth valve 43, and the fourteenth valve 44 are adjusted to change the flow rate of the steam entering the second back pressure machine 9, thereby changing the power generation amount of the second generator 10 to match the power consumption amounts of the drain circulation pump 13, the grid water circulation pump 14, the heat storage circulation pump 16, and the heat release circulation pump 17.

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. The utility model provides a clean heating system of thermoelectric unit extraction coupling solar energy which characterized in that includes: the system comprises a cogeneration unit (1), a condenser (2), an industrial steam user (3), a first back press (4), a first generator (5), a steam type electrode boiler (6), a steam-water mixed heating device (7), a heating user (8), a second back press (9), a second generator (10), a steam-water heat exchanger (11), a water-water heat exchanger (12), a drainage circulating pump (13), a heat network water circulating pump (14), a hot water heat storage device (15), a heat storage circulating pump (16), a heat release circulating pump (17), a photovoltaic power generation device (18), a power energy storage device (19), inversion control equipment (20) and a hot water type electrode boiler (21), wherein a steam outlet of the cogeneration unit (1) is connected with a steam inlet of the condenser (2), a steam inlet of the industrial steam extraction port of the cogeneration unit (1) is connected with a steam inlet of an industrial steam conveying pipe (71), a first valve (31) is arranged 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 back press (4) and a steam inlet of a second back press (9) through a first industrial steam branch pipe (72) and a second industrial steam branch pipe (73), a third valve (33) is arranged on the first industrial steam branch pipe (72), a fourth valve (34) is arranged at the steam inlet of the first back press (4), a twelfth valve (42) is arranged at the steam inlet of the second back press (9), a steam outlet of the first back press (4) is connected with a steam inlet of an industrial steam user (3), a fifth valve (35) is arranged at the steam outlet of the first back press (4), a first steam bypass (74) is arranged between the steam inlet and the steam outlet of the first back press (4), a sixth valve (36) is installed on the first steam bypass (74), the first back press (4) drives the first generator (5) to do work and generate power, the power generated by the first generator (5) is transmitted to the steam type electrode boiler (6) to generate steam, a steam outlet of the steam type electrode boiler (6) is respectively connected with a steam inlet of an industrial steam user (3) and a steam inlet of the steam-water mixed heating device (7) through a first steam branch pipe (75) and a second steam branch pipe (76), an eighth valve (38) is installed on the first steam branch pipe (75), a ninth valve (39) is installed on the second steam branch pipe (76), a steam outlet of the second back press (9) is connected with a steam inlet of the steam-water heat exchanger (11), a thirteenth valve (43) is installed on a steam outlet of the second back press (9), and a second steam bypass (78) is arranged between the steam inlet and the steam outlet of the second back press (9), a fourteenth valve (44) is installed on the second steam bypass (78), the second back press (9) drives the second generator (10) to do work and generate power, a hydrophobic outlet of the steam-water heat exchanger (11) is connected with a hydrophobic inlet of the water-water heat exchanger (12), a fifteenth valve (45) is installed at the hydrophobic outlet of the steam-water heat exchanger (11), a sixteenth valve (46) is installed at the hydrophobic inlet of the water-water heat exchanger (12), the hydrophobic inlet of the water-water heat exchanger (12) is also connected with the hydrophobic outlet of the industrial steam user (3) and the high-temperature water outlet of the steam-water mixed heating device (7) through a first hydrophobic conveying pipe (77), an eleventh valve (41) is installed on the first hydrophobic conveying pipe (77), a seventh valve (37) is installed at the hydrophobic outlet of the industrial steam user (3), and a tenth valve (40) is installed at the high-temperature water outlet of the steam-water mixed heating device (7), a drain outlet of the water-water heat exchanger (12) is connected with a drain inlet of the condenser (2) through a second drain conveying pipe (80), a seventeenth valve (47) is installed at the drain outlet of the water-water heat exchanger (12), a drain circulating pump (13) is installed on the second drain conveying pipe (80), a second valve (32) is installed at the drain inlet of the condenser (2), a heat supply network water outlet of a heating user (8) is connected with a heat supply network water inlet of the water-water heat exchanger (12) through a heat supply network water return pipe (82), a heat supply network water circulating pump (14) is installed on the heat supply network water return pipe (82), a twentieth valve (50) is installed at the heat supply network water inlet of the water-water heat exchanger (12), the heat supply network water outlet of the water heat exchanger (12) is connected with a water inlet of the water-water heat exchanger (11), and a twenty-first valve (51) is installed at the heat supply network water outlet of the water heat exchanger (12), a thirteenth valve (53) is installed at a water inlet of the steam-water heat exchanger (11), a water outlet of the steam-water heat exchanger (11) is connected with a heat supply network water inlet of a heating user (8) through a heat supply network water supply pipe (83), a twenty-fourth valve (54) is installed at the water outlet of the steam-water heat exchanger (11), a twenty-fifth valve (55) is installed on the heat supply network water supply pipe (83), a heat storage end of the hot-water heat storage device (15) is connected with the heat supply network water inlet of the water-water heat exchanger (12) and the water outlet of the steam-water heat exchanger (11) through a first heat storage pipe (85) and a second heat storage pipe (86), a twenty-sixth valve (56) and a heat storage circulating pump (16) are installed on the first heat storage pipe (85), a twenty-seventh valve (57) is installed on the second heat storage pipe (86), a heat release end of the hot-water heat storage device (15) is connected with a water outlet of the heat supply network water circulating pump (14) through the first heat release pipe (87) and the second heat release pipe (88) respectively The mouth is connected with the end of intaking of heat supply network delivery pipe (83), and installs twenty-eighth valve (58) on first heat release pipe (87), installs twenty-ninth valve (59) and exothermic circulating pump (17) on second heat release pipe (88), photovoltaic power generation device (18) are connected with electric energy memory (19) and hot water formula electrode boiler (21) simultaneously through contravariant controlgear (20), electric energy memory (19) also are connected with hot water formula electrode boiler (21) through contravariant controlgear (20), the hot water export of hot water formula electrode boiler (21) passes through high temperature water branch pipe (89) and is connected with the hydrophobic access of water heat exchanger (12), and installs thirtieth valve (60) in the hot water export of hot water formula electrode boiler (21).

2. The clean heating system with the thermoelectric generating set steam extraction and coupling solar energy as claimed in claim 1, wherein the steam-water mixing heating device (7) is a direct contact type heat exchanger, and the steam from the steam type electrode boiler (6) and externally supplied feed water are subjected to mixing heat exchange in the steam-water mixing heating device (7).

3. The clean heating system of the thermoelectric unit steam extraction coupling solar energy as claimed in claim 1, wherein the water-repellent side of the water-water heat exchanger (12) is provided with a first water-repellent bypass (79), and an eighteenth valve (48) is installed on the first water-repellent bypass (79), the heat supply network water side of the water-water heat exchanger (12) is provided with a heat supply network water bypass (84), and a twenty-second valve (52) is installed on the heat supply network water bypass (84).

4. The clean heating system of the thermoelectric generating set steam extraction coupling solar energy as claimed in claim 1, wherein a second hydrophobic bypass (81) is arranged between the water outlet of the hydrophobic circulating pump (13) and the heat supply network water return pipe (82), and a nineteenth valve (49) is installed on the second hydrophobic bypass (81).

5. The thermoelectric unit steam extraction coupling solar clean heating system according to claim 1, wherein the electric power generated by the second generator (10) is used for driving a drainage circulating pump (13), a heat network water circulating pump (14), a heat storage circulating pump (16) and a heat release circulating pump (17) to do work, and the electric power generated by the first generator (5) is also used for driving a power plant of an industrial steam user (3) to do work.

6. A thermoelectric unit steam extraction coupled solar clean heating system according to claim 1, characterized in that the electric energy storage device (19) can be a battery energy storage device or a capacitor energy storage device.

7. An operation method of a clean heating system of a thermoelectric unit steam extraction coupling solar energy as claimed in any one of claims 1 to 6, characterized in that the operation method is as follows:

opening and adjusting a first valve (31), supplying industrial steam generated by the cogeneration unit (1) to the outside through an industrial steam conveying pipe (71), and supplying steam to an industrial steam user (3) and heating a heating user (8) through a first industrial steam branch pipe (72) and a second industrial steam branch pipe (73) respectively;

at the moment, the third valve (33), the fourth valve (34), the fifth valve (35), the sixth valve (36) and the seventh valve (37) are opened and adjusted, industrial steam from an industrial steam conveying pipe (71) enters the first back pressure machine (4) firstly to drive the first generator (5) to do work and generate power, the other part of industrial steam and exhaust steam of the first back pressure machine (4) are conveyed to an industrial steam user (3) together to be used for production of the industrial steam user (3), electric power generated by the first generator (5) is supplied to the steam type electrode boiler (6) to generate steam, and steam hydrophobic water generated by the industrial steam user (3) is supplied to the outside through the first hydrophobic conveying pipe (77);

at the moment, an eighteenth valve (48), a nineteenth valve (49) and a twenty-second valve (52) are closed, a second valve (32), an eleventh valve (41), a twelfth valve (42), a thirteenth valve (43), a fourteenth valve (44), a fifteenth valve (45), a sixteenth valve (46) and a seventeenth valve (47) are opened and adjusted, industrial steam from an industrial steam conveying pipe (71) enters a second back pressure machine (9) firstly to drive a second generator (10) to do work and generate power, the other part of industrial steam and exhaust steam of the second back pressure machine (9) are conveyed to a steam-water heat exchanger (11) together to heat mains water, electric power generated by the second generator (10) is used for driving a drain water circulating pump (13), a mains water circulating pump (14), a heat storage circulating pump (16) and a heat releasing circulating pump (17) to do work, steam drain from an industrial steam user (3) and steam-water exchange heat with a steam-water through a first drain conveying pipe (77) Steam drainage formed by the device (11) enters the water-water heat exchanger (12) together to heat the heat supply network water, the drainage after being cooled by the water-water heat exchanger (12) returns to the condenser (2) through the second drainage conveying pipe (80) under the driving of the drainage circulating pump (13), and meanwhile, the twentieth valve (50), the twenty-first valve (51), the twenty-third valve (53), the twenty-fourth valve (54) and the twenty-fifth valve (55) are opened and adjusted, heat supply network return water from a heating user (8) is conveyed to the water-water heat exchanger (12) through the heat supply network return water pipe (82) under the driving of the heat supply network water circulating pump (14) to be heated for the first stage, then enters the steam-water heat exchanger (11) to be heated for the second stage, and the formed high-temperature heat supply network water is conveyed to the heating user (8) through the heat supply network water pipe (83) to be heated for the first stage;

at the moment, the thirtieth valve (60) is opened and adjusted, the photovoltaic power generation device (18) generates power by utilizing solar energy, then the power generated by the photovoltaic power generation device (18) is supplied to the hot water type electrode boiler (21) through the inversion control device (20) to generate high-temperature hot water, and is also supplied to the electric energy storage device (19) to be stored, at the moment, when the power used for generating the hot water by the hot water type electrode boiler (21) is insufficient, the power stored by the electric energy storage device (19) can also be supplied to the hot water type electrode boiler (21) through the inversion control device (20) to generate the high-temperature hot water, and the high-temperature hot water generated by the hot water type electrode boiler (21) is conveyed to the water-water heat exchanger (12) to heat the hot network water.

8. The operation method of the thermoelectric generating set steam extraction coupling solar energy cleaning and heating system according to claim 7, characterized in that:

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:

on one hand, the flow rate of the industrial steam which is conveyed to the industrial steam user (3) through the first industrial steam branch pipe (72) is reduced, and at the moment, the steam which is generated by the steam type electrode boiler (6) can be used for the industrial steam user (3) by opening the eighth valve (38) to compensate the steam flow rate which is supplied by the cogeneration unit (1) in a short time;

on the other hand, the flow rate of the industrial steam conveyed to the steam-water heat exchanger (11) through the second industrial steam branch pipe (73) is reduced, in this case, the heat of the steam which is less supplied by the cogeneration unit (1) can be compensated by opening the twenty-eighth valve (58) and the twenty-ninth valve (59) to release heat to the outside by using the hot water heat storage device (15), and the heat of the steam which is less supplied by the cogeneration unit (1) can also be compensated by opening the thirty-eighth valve (60) to supply the high-temperature hot water generated by the hot water type electrode boiler (21) to the water-water heat exchanger (12);

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:

on one hand, the flow rate of the industrial steam conveyed to the steam-water heat exchanger (11) through the second industrial steam branch pipe (73) is increased, at the moment, a twenty-sixth valve (56) and a twenty-seventh valve (57) are opened and adjusted, a twenty-eighth valve (58) and a twenty-ninth valve (59) are closed, the hot water heat storage device (15) can be used for storing heat to absorb the heat supplied by the steam-water heat exchanger (11) and the water-water heat exchanger (12), so that the steam heat supplied by the cogeneration unit (1) is absorbed, the opening degrees of a tenth valve (40), an eleventh valve (41) and a thirty valve (60) are reduced until the tenth valve is closed, and the heat supplied by the steam-water mixed heating device (7) and the hot water type electrode boiler (21) can be reduced to replace the steam heat supplied by the cogeneration unit (1);

on the other hand, the flow of the industrial steam conveyed to the industrial steam user (3) through the first industrial steam branch pipe (72) is increased, at the moment, the opening degree of the eighth valve (38) is reduced until the eighth valve is closed, the flow of the steam conveyed to the industrial steam user (3) by the steam type electrode boiler is reduced, the steam flow which is supplied by the cogeneration unit (1) is replaced, and the electric power generated by the first generator (5) is used for driving power equipment of the industrial steam user (3) to do work;

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:

on the other hand, the flow rate of the industrial steam delivered to the steam-water heat exchanger (11) through the second industrial steam branch pipe (73) is reduced, and at this time, the heat of the steam which is less supplied by the cogeneration unit (1) can be compensated by opening the twenty-eighth valve (58) and the twenty-ninth valve (59) to release heat to the outside by the hot water heat storage device (15), or the heat of the steam which is less supplied by the cogeneration unit (1) can be compensated by opening the thirty-eighth valve (60) to supply the high-temperature hot water generated by the hot water type electrode boiler (21) to the water-water heat exchanger (12).

9. The operation method of the thermoelectric generating set steam extraction coupling solar energy cleaning and heating system according to claim 7, characterized in that:

when the price of the unit steam heat provided by the steam type electrode boiler (6) to the water-water heat exchanger (12) is larger than the price of the unit steam heat provided by the industrial steam conveying pipe (71) to the industrial steam user (3), the eighth valve (38) is closed, the ninth valve (39), the tenth valve (40) and the eleventh valve (41) are opened, the steam from the steam type electrode boiler (6) and externally supplied feed water are subjected to mixed heat exchange in the steam-water mixed heating device (7) to form hot water, and then the hot water is supplied to the water-water heat exchanger (12) through the first drainage conveying pipe (77) to supply heat to the heating user (8);

when the price of the unit steam heat provided by the steam type electrode boiler (6) to the water-water heat exchanger (12) is less than the price of the unit steam heat provided by the industrial steam conveying pipe (71) to the industrial steam user (3), the ninth valve (39) and the tenth valve (40) are closed, the eighth valve (38) is opened, and the steam from the steam type electrode boiler (6) is directly provided for the industrial steam user (3) to use;

when the price per unit heat provided by the industrial steam conveying pipe (71) is larger than that provided by the hot water type electrode boiler (21), the opening degrees of the twelfth valve (42) and the fourteenth valve (44) are reduced until the valves are closed, the thirtieth valve (60) is opened and adjusted, the flow rate of the hot water supplied to the water-water heat exchanger (12) by the hot water type electrode boiler (21) is increased, and the flow rate of the steam supplied to the steam-water heat exchanger (11) by the industrial steam conveying pipe (71) is reduced until the flow rate is zero;

when the price per unit heat provided by the industrial steam conveying pipe (71) is less than that provided by the hot water type electrode boiler (21), the opening degree of a thirtieth valve (60) is reduced until the thirtieth valve is closed, a twelfth valve (42) and a fourteenth valve (44) are opened and adjusted, the steam flow of the industrial steam conveying pipe (71) to the steam-water heat exchanger (11) is increased, and the hot water flow of the hot water type electrode boiler (21) to the water-water heat exchanger (12) is reduced until the hot water flow is zero.

10. The operation method of the thermoelectric generating set steam extraction coupling solar energy cleaning and heating system according to claim 7, characterized in that:

when the return water pressure of the heat supply network from the heating user (8) is low, the nineteenth valve (49) is opened, the second valve (32) is closed, the drain water from the water-water heat exchanger (12) is driven by the drain water circulating pump (13) to be conveyed to the return water pipe (82) of the heat supply network through the second drain water bypass (81), and water supplementing and pressure stabilizing are carried out on the heating system of the heating user (8);

when the power consumption of the drainage circulating pump (13), the heat supply network water circulating pump (14), the heat storage circulating pump (16) and the heat release circulating pump (17) is changed, the opening degrees of a twelfth valve (42), a thirteenth valve (43) and a fourteenth valve (44) are adjusted, and the steam flow entering the second back pressure machine (9) is changed, so that the power generation amount of the second generator (10) is changed to match the power consumption of the drainage circulating pump (13), the heat supply network water circulating pump (14), the heat storage circulating pump (16) and the heat release circulating pump (17).