CN115264563A - Heat storage peak regulation and energy-saving steam supply thermodynamic system - Google Patents
Heat storage peak regulation and energy-saving steam supply thermodynamic system Download PDFInfo
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- CN115264563A CN115264563A CN202210975477.6A CN202210975477A CN115264563A CN 115264563 A CN115264563 A CN 115264563A CN 202210975477 A CN202210975477 A CN 202210975477A CN 115264563 A CN115264563 A CN 115264563A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D11/00—Central heating systems using heat accumulated in storage masses
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D18/00—Small-scale combined heat and power [CHP] generation systems specially adapted for domestic heating, space heating or domestic hot-water supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1003—Arrangement or mounting of control or safety devices for steam heating systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
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- F24D2101/00—Electric generators of small-scale CHP systems
- F24D2101/10—Gas turbines; Steam engines or steam turbines; Water turbines, e.g. located in water pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2103/00—Thermal aspects of small-scale CHP systems
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Abstract
A thermal power system for heat storage peak regulation and energy-saving steam supply belongs to the field of thermal power unit peak regulation and industrial steam supply system design. The method solves the problem of guaranteeing the steam supply capacity when the thermal power generating unit participates in peak shaving. The system comprises the following steps: the system comprises an inclined temperature layer molten salt storage tank, a low-temperature molten salt circulating pump, a first low-temperature molten salt flow control valve, a molten salt-steam heat exchanger, a second low-temperature molten salt flow control valve, a molten salt electric heating furnace, a high-temperature molten salt circulating pump, a high-temperature molten salt flow control valve, a superheater, an evaporator, a preheater, a pressure regulating valve and an extraction control valve group. The invention realizes thermoelectric decoupling by a fused salt heat storage mode, and ensures that the steam turbine set can continuously and stably supply steam under the peak regulation operation condition; the superheat degree of partial steam can be stored; the steam supply requirements of different levels of pressure can be met; the steam supply requirements of different flow rates can be met; the molten salt electric heating furnace utilizes clean energy, can promote new forms of energy electric power to consume, and is energy-conserving, carbon-reducing and environment-friendly. The system is suitable for heat storage and peak regulation and energy-saving steam supply heating power.
Description
Technical Field
The invention belongs to the field of peak shaving of thermal power generating units and design of industrial steam supply systems, and particularly relates to a thermal system for heat storage peak shaving and energy-saving steam supply.
Background
The position of thermal power as the main energy of power generation will be gradually replaced by new energy, and the peak regulation requirement of the thermal power unit will be stricter and stricter. A large number of units have industrial steam supply requirements, and are responsible for local development and improvement of civil life, and the current part of units can meet the steam supply requirements only under the high-load working condition, and the problems of low steam supply pressure, insufficient steam supply flow and the like can occur under the low-load working condition. The peak regulation requirement of the thermal power generating unit is stricter, and the steam supply capacity of the thermal power generating unit is inevitably influenced, so that the problem of strong thermoelectric coupling of the thermal power generating unit is solved, and the important guarantee that the thermal power generating unit meets the industrial steam supply requirement under the deep peak regulation requirement is provided.
Disclosure of Invention
The invention aims to solve the problem of guaranteeing the steam supply capacity when a thermal power generating unit participates in peak shaving, and provides a heat storage peak shaving and energy-saving steam supply thermodynamic system.
A heat storage peak regulation and energy-saving steam supply thermodynamic system comprises an inclined temperature layer molten salt storage tank, a low-temperature molten salt circulating pump, a first low-temperature molten salt flow control valve, a molten salt-steam heat exchanger, a second low-temperature molten salt flow control valve, a molten salt electric heating furnace, a high-temperature molten salt circulating pump, a high-temperature molten salt flow control valve, a superheater, an evaporator, a preheater, a pressure regulating valve and a steam extraction control valve group;
the low-temperature outlet of the thermocline molten salt storage tank is connected with a low-temperature molten salt circulating pump and then divided into two paths, one path is connected with the molten salt inlet of the molten salt-steam heat exchanger through a first low-temperature molten salt flow control valve, and the molten salt outlet of the molten salt-steam heat exchanger is connected with the high-temperature inlet of the thermocline molten salt storage tank; the other path is connected with a high-temperature inlet of the thermocline molten salt storage tank through a second low-temperature molten salt flow control valve through a molten salt electric heating furnace;
the high-temperature outlet of the thermocline molten salt storage tank is sequentially connected with the high-temperature molten salt circulating pump, the high-temperature molten salt flow control valve and the molten salt inlet of the superheater, the molten salt outlet of the superheater is connected with the molten salt inlet of the evaporator, the molten salt outlet of the evaporator is connected with the molten salt inlet of the preheater, and the molten salt outlet of the preheater is connected with the low-temperature inlet of the thermocline molten salt storage tank;
the steam outlet of the preheater is connected with the steam inlet of the evaporator, the steam outlet of the evaporator is connected with the steam inlet of the superheater, and the steam outlet of the superheater is connected with the steam outlet of the fused salt-steam heat exchanger.
The working principle of the heat storage peak regulation and energy-saving steam supply thermodynamic system comprises the following steps:
the hot molten salt is used for heating the high-temperature and high-pressure feed water of the steam turbine to ensure that the steam turbine unit meets the industrial steam supply requirement under the peak regulation operation condition. When the steam extraction parameters of the steam turbine set are higher than the industrial steam supply parameters, the steam extraction of the steam turbine set exchanges heat with cold molten salt through a steam-molten salt heat exchanger to store heat of a superheated part of extracted steam, and the extracted steam of the steam turbine set is cooled to the steam supply temperature and then supplied to the industrial steam supply; when the steam extraction temperature and pressure of the steam turbine set are both higher than industrial steam supply parameters and the flow is lower than the industrial steam supply parameters, high-temperature and high-pressure feed water of the steam turbine is decompressed to steam supply pressure through a pressure regulating valve and then sequentially enters a preheater, an evaporator and a superheater to exchange heat with hot melt salt, the hot melt salt sequentially heats water to a saturated water state, a saturated steam state and a superheated steam state, and then industrial steam supply is performed to the outside; when the steam extraction temperature or pressure of the steam turbine set is lower than the industrial steam supply parameter, the industrial steam supply is completely provided by the supplementary steam supply. The hot molten salt for heating the high-temperature and high-pressure feed water of the steam turbine to supplement the steam has two sources, one part is the hot molten salt stored by the heat exchange between the extracted steam of the steam turbine unit and the cold molten salt through the steam-molten salt heat exchanger, and the other part is the hot molten salt stored by heating the cold molten salt by utilizing clean electric energy or trough electricity. The invention stores the hot molten salt in two ways to achieve the purpose of decoupling steam supply and power supply, so that when the steam turbine unit participates in peak shaving extremely low load operation, the situations of insufficient steam extraction capacity, reduced safety and stability and the like caused by unsatisfied steam parameters are avoided, and the continuous and stable steam supply of the steam turbine unit is realized under the deep peak shaving operation of the unit.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention realizes thermoelectric decoupling by a molten salt heat storage mode, ensures that the steam turbine set can continuously and stably supply steam under the peak regulation operation condition, and can ensure the steam supply for at least 3-5h under the deep regulation mode in consideration of economy.
(2) The invention can store partial steam superheat degree, achieves the effect of waste heat storage and utilization, and can store the steam sensible heat superheat degree with the temperature difference ranging from 100 to 150 ℃.
(3) The invention can meet the steam supply requirements of different levels of pressure, the steam supply pressure can be adjusted, and the invention can adapt to the pressure change range of 1.5-4.0 MPa.
(4) The invention can meet the steam supply requirements of different flow rates, the steam supply flow rate can be adjusted, and the system can adapt to the change of the steam supply flow rate which is less than or equal to 200 t/h.
(5) The power supply of the molten salt electric heating furnace can be from clean energy sources such as wind power, photoelectricity and the like, can promote the consumption of new energy power, reduces wind and light abandonment, and achieves the effects of energy conservation, carbon reduction and environmental protection.
The system is suitable for heat storage peak regulation and energy-saving steam supply heating power.
Drawings
Fig. 1 is a schematic diagram of a self-balancing reaction frame in the invention, wherein 1 represents an inclined temperature layer molten salt storage tank, 2 represents a low-temperature molten salt circulating pump, 3 represents a first low-temperature molten salt flow control valve, 4 represents a molten salt-steam heat exchanger, 5 represents a second low-temperature molten salt flow control valve, 6 represents a molten salt electric heating furnace, 7 represents a high-temperature molten salt circulating pump, 8 represents a high-temperature molten salt flow control valve, 9 represents a superheater, 10 represents an evaporator, 11 represents a preheater, 12 represents a pressure regulating valve, 13 represents a steam extraction control valve group, 65097 \\\65097 \\\\ 65097and represents a steam pipeline.
Detailed Description
The technical solution of the present invention is not limited to the following specific embodiments, but includes any combination of the specific embodiments.
The first embodiment is as follows: with reference to fig. 1, the heat storage peak shaving and energy saving steam supply thermodynamic system of the present embodiment includes an inclined temperature layer molten salt storage tank 1, a low temperature molten salt circulating pump 2, a first low temperature molten salt flow control valve 3, a molten salt-steam heat exchanger 4, a second low temperature molten salt flow control valve 5, a molten salt electric heating furnace 6, a high temperature molten salt circulating pump 7, a high temperature molten salt flow control valve 8, a superheater 9, an evaporator 10, and a preheater 11;
the thermocline molten salt storage tank 1 is a thermocline storage tank with a middle partition plate, the upper layer is used for storing hot molten salt, and the lower layer is used for storing cold molten salt; the upper layer of the thermocline molten salt storage tank 1 is provided with a high-temperature inlet and a high-temperature outlet, and the lower layer of the thermocline molten salt storage tank 1 is provided with a low-temperature outlet and a low-temperature inlet;
the low-temperature outlet of the thermocline molten salt storage tank 1 is connected with the inlet of a low-temperature molten salt circulating pump 2, and the outlet of the low-temperature molten salt circulating pump 2 is respectively connected with the inlets of a first low-temperature molten salt flow control valve 3 and a second low-temperature molten salt flow control valve 5; an outlet of the first low-temperature molten salt flow control valve 3 is connected with a molten salt inlet of the molten salt-steam heat exchanger 4, and a molten salt outlet of the molten salt-steam heat exchanger 4 is connected with a high-temperature inlet of the thermocline molten salt storage tank 1; a molten salt electric heating furnace 6 is arranged between the outlet of the second low-temperature molten salt flow control valve 5 and the high-temperature inlet of the thermocline molten salt storage tank 1;
the high-temperature outlet of the thermocline molten salt storage tank 1 is sequentially connected with the high-temperature molten salt circulating pump 7, the high-temperature molten salt flow control valve 8 and the molten salt inlet of the superheater 9, the molten salt outlet of the superheater 9 is connected with the molten salt inlet of the evaporator 10, the molten salt outlet of the evaporator 10 is connected with the molten salt inlet of the preheater 11, and the molten salt outlet of the preheater 11 is connected with the low-temperature inlet of the thermocline molten salt storage tank 1;
the steam outlet of the preheater 11 is connected with the steam inlet of the evaporator 10, the steam outlet of the evaporator 10 is connected with the steam inlet of the superheater 9, and the steam outlet of the superheater 9 is connected with the steam outlet of the fused salt-steam heat exchanger 4.
The thermocline molten salt storage tank 1 in the embodiment is the existing equipment, and is shown in the Chinese invention patent with the application number of 202011595116.6 and the name of the equipment is as follows: an inclined temperature layer storage tank structure with a middle partition plate.
The second embodiment is as follows: the difference between the embodiment and the specific embodiment is that the thermal system for heat storage peak regulation and energy-saving steam supply further comprises a pressure regulating valve 12, wherein one end of the pressure regulating valve 12 is connected with a steam inlet of the preheater 11, and the other end of the pressure regulating valve 12 is connected with high-temperature and high-pressure steam supply of a steam turbine. The rest is the same as the first embodiment.
The third concrete implementation mode: the difference between the present embodiment and the first embodiment is that the thermal system for heat storage, peak regulation and energy saving steam supply further comprises a steam extraction control valve set 13, wherein one end of the steam extraction control valve set 13 is connected to the steam inlet of the molten salt-steam heat exchanger 4, and the other end of the steam extraction control valve set is connected to the steam extraction of the steam turbine set. The rest is the same as the first embodiment.
The fourth concrete implementation mode is as follows: this embodiment is different from the first embodiment in that, opens high temperature fused salt flow control valve 8, and high temperature fused salt circulating pump 7 pumps the hot molten salt in thermocline fused salt storage tank 1 into over heater 9, flows into evaporimeter 10 after cooling with saturated steam heat transfer, flows into pre-heater 11 after cooling again with the saturated water heat transfer, flows out from pre-heater 11 after cooling for the third time with the water heat transfer, becomes cold fused salt, gets back to thermocline fused salt storage tank 1. The rest is the same as the first embodiment.
The fifth concrete implementation mode is as follows: the difference between the embodiment and the specific embodiment is that in the energy storage process, the first low-temperature molten salt flow control valve 3 is opened, the low-temperature molten salt circulating pump 2 pumps cold molten salt in the thermocline molten salt storage tank 1 into the steam-molten salt heat exchanger 4 to exchange heat with steam extracted by the steam turbine set passing through the steam extraction control valve set 13 to form hot molten salt, and then the hot molten salt flows into the thermocline molten salt storage tank 1; in the process, the steam extraction temperature of the steam turbine set is reduced to the steam supply parameter for supplying steam to the outside, and at the moment, all the industrial steam supply is supplied by the steam extraction temperature reduction of the steam turbine set. The rest is the same as the first embodiment.
The sixth specific implementation mode is as follows: the difference between the embodiment and the specific embodiment is that in the energy storage process, the second low-temperature molten salt flow control valve 5 is opened, and the low-temperature molten salt circulating pump 2 pumps the cold molten salt in the thermocline molten salt storage tank 1 into the molten salt electric heating furnace 6 to heat the cold molten salt into hot molten salt, and then the hot molten salt flows into the thermocline molten salt storage tank 1. The rest is the same as the first embodiment.
The seventh concrete implementation mode: the sixth embodiment is different from the sixth embodiment in that the molten salt electric heating furnace 6 uses clean electric energy or valley electricity. The rest is the same as the sixth embodiment.
The specific implementation mode is eight: the difference between the embodiment and the specific embodiment is that in the energy release process, when the steam extraction temperature and the pressure of the steam turbine set are both higher than the industrial steam supply parameter and the flow is lower than the industrial steam supply parameter, the first low-temperature molten salt flow control valve 3 is opened, the steam extraction of the steam turbine set exchanges heat with cold molten salt entering the steam-molten salt heat exchanger 4 through the steam extraction control valve set 13 and the low-temperature molten salt circulating pump 2 and the first low-temperature molten salt flow control valve 3, and the temperature of the steam extraction of the steam turbine set is reduced to the steam supply parameter for supplying steam to the outside; meanwhile, a high-temperature molten salt flow control valve 8 is opened, a high-temperature molten salt circulating pump 7 pumps the hot molten salt in the inclined temperature layer molten salt storage tank 1 into a superheater 9, an evaporator 10 and a preheater 11, high-temperature and high-pressure feed water of a steam turbine is decompressed to steam supply pressure through a pressure regulating valve 12 and then enters the preheater 11 to exchange heat with the hot molten salt, water is heated to a saturated water state, the saturated water enters the evaporator 10 to exchange heat with the hot molten salt, saturated water is heated to a saturated steam state, saturated steam enters the superheater 9 to exchange heat with the hot molten salt, the saturated steam is heated to an overheated steam state to become supplementary steam supply and steam supply to the outside, and at the moment, industrial steam supply is provided by steam extraction, temperature reduction and supplementary steam supply of a steam turbine set. The rest is the same as the first embodiment.
The specific implementation method nine: the difference between this embodiment and the first embodiment is that in the energy release process, when the steam extraction temperature or pressure of the steam turbine set is lower than the industrial steam supply parameter, the high-temperature molten salt flow control valve 8 is opened, the high-temperature molten salt circulating pump 7 pumps the hot molten salt in the inclined temperature layer molten salt storage tank 1 into the superheater 9, the evaporator 10 and the preheater 11, the high-temperature high-pressure feed water of the steam turbine is decompressed to steam supply pressure through the pressure regulating valve 12 and then enters the preheater 11 to exchange heat with the hot molten salt, the water is heated to a saturated water state, the saturated water enters the evaporator 10 to exchange heat with the hot molten salt, the saturated water is heated to a saturated steam state, the saturated steam enters the superheater 9 to exchange heat with the hot molten salt, the saturated steam is heated to a superheated steam state to become supplementary steam supply for external steam supply, and at this time, all the industrial steam supply is supplied by supplementary steam. The rest is the same as the first embodiment.
The beneficial effects of the present invention are demonstrated by the following examples:
example (b):
with reference to fig. 1, a heat storage peak shaving and energy-saving steam supply thermodynamic system comprises an inclined temperature layer molten salt storage tank 1, a low-temperature molten salt circulating pump 2, a first low-temperature molten salt flow control valve 3, a molten salt-steam heat exchanger 4, a second low-temperature molten salt flow control valve 5, a molten salt electric heating furnace 6, a high-temperature molten salt circulating pump 7, a high-temperature molten salt flow control valve 8, a superheater 9, an evaporator 10 and a preheater 11;
the thermocline molten salt storage tank 1 is a thermocline storage tank with a middle partition plate, the upper layer is used for storing hot molten salt, and the lower layer is used for storing cold molten salt; the upper layer of the thermocline molten salt storage tank 1 is provided with a high-temperature inlet and a high-temperature outlet, and the lower layer of the thermocline molten salt storage tank 1 is provided with a low-temperature outlet and a low-temperature inlet;
the low-temperature outlet of the thermocline molten salt storage tank 1 is connected with the inlet of a low-temperature molten salt circulating pump 2, and the outlet of the low-temperature molten salt circulating pump 2 is respectively connected with the inlets of a first low-temperature molten salt flow control valve 3 and a second low-temperature molten salt flow control valve 5; an outlet of the first low-temperature molten salt flow control valve 3 is connected with a molten salt inlet of the molten salt-steam heat exchanger 4, and a molten salt outlet of the molten salt-steam heat exchanger 4 is connected with a high-temperature inlet of the thermocline molten salt storage tank 1; a molten salt electric heating furnace 6 is arranged between the outlet of the second low-temperature molten salt flow control valve 5 and the high-temperature inlet of the thermocline molten salt storage tank 1;
the high-temperature outlet of the thermocline molten salt storage tank 1 is sequentially connected with the high-temperature molten salt circulating pump 7, the high-temperature molten salt flow control valve 8 and the molten salt inlet of the superheater 9, the molten salt outlet of the superheater 9 is connected with the molten salt inlet of the evaporator 10, the molten salt outlet of the evaporator 10 is connected with the molten salt inlet of the preheater 11, and the molten salt outlet of the preheater 11 is connected with the low-temperature inlet of the thermocline molten salt storage tank 1;
the steam outlet of the preheater 11 is connected with the steam inlet of the evaporator 10, the steam outlet of the evaporator 10 is connected with the steam inlet of the superheater 9, and the steam outlet of the superheater 9 is connected with the steam outlet of the fused salt-steam heat exchanger 4.
The heat storage peak regulation and energy-saving steam supply thermodynamic system further comprises a pressure regulating valve 12, wherein one end of the pressure regulating valve 12 is connected with a steam inlet of a preheater 11, and the other end of the pressure regulating valve 12 is connected with high-temperature and high-pressure water supply of a steam turbine.
The heat storage peak regulation and energy-saving steam supply thermodynamic system further comprises a steam extraction control valve group 13, wherein one end of the steam extraction control valve group 13 is connected with a steam inlet of the molten salt-steam heat exchanger 4, and the other end of the steam extraction control valve group is connected with steam extraction of a steam turbine set.
Open high temperature fused salt flow control valve 8 in this embodiment, high temperature fused salt circulating pump 7 pumps into over heater 9 with the hot molten salt in thermocline fused salt storage tank 1, flows into evaporimeter 10 after cooling with saturated steam heat transfer, flows into pre-heater 11 after cooling once more through with the saturated water heat transfer, flows out from pre-heater 11 after cooling with water heat transfer the third time, becomes cold fused salt, gets back to thermocline fused salt storage tank 1.
In the heat storage, peak regulation and energy-saving steam supply thermodynamic system in the embodiment, in the energy storage process, a first low-temperature molten salt flow control valve 3 is opened, a low-temperature molten salt circulating pump 2 pumps cold molten salt in an inclined-temperature layer molten salt storage tank 1 into a steam-molten salt heat exchanger 4 to exchange heat with steam extracted by a steam turbine set passing through a steam extraction control valve set 13 to form hot molten salt, and then the hot molten salt flows into the inclined-temperature layer molten salt storage tank 1; in the process, the steam extraction of the steam turbine set is cooled to the steam supply parameter for supplying steam to the outside, and at the moment, all the industrial steam supply is supplied by the steam extraction and cooling of the steam turbine set.
In the heat storage and peak regulation and energy-saving steam supply thermodynamic system in the embodiment, in the energy storage process, the second low-temperature molten salt flow control valve 5 is opened, the low-temperature molten salt circulating pump 2 pumps cold molten salt in the thermocline molten salt storage tank 1 into the molten salt electric heating furnace 6 to be heated into hot molten salt, and then the hot molten salt flows into the thermocline molten salt storage tank 1; the molten salt electric heating furnace 6 adopts clean electric energy or wave valley electricity.
In the energy release process, when the steam extraction temperature and pressure of the steam turbine unit are both higher than industrial steam supply parameters and the flow is lower than the industrial steam supply parameters, the first low-temperature molten salt flow control valve 3 is opened, the steam extraction of the steam turbine unit exchanges heat with cold molten salt entering the steam-molten salt heat exchanger 4 through the low-temperature molten salt circulating pump 2 and the first low-temperature molten salt flow control valve 3 through the steam extraction control valve group 13, and the temperature of the steam extraction of the steam turbine unit is reduced to the steam supply parameters to supply steam to the outside; meanwhile, a high-temperature molten salt flow control valve 8 is opened, a high-temperature molten salt circulating pump 7 pumps the hot molten salt in the inclined temperature layer molten salt storage tank 1 into a superheater 9, an evaporator 10 and a preheater 11, high-temperature and high-pressure feed water of a steam turbine is decompressed to steam supply pressure through a pressure regulating valve 12 and then enters the preheater 11 to exchange heat with the hot molten salt, water is heated to a saturated water state, the saturated water enters the evaporator 10 to exchange heat with the hot molten salt, saturated water is heated to a saturated steam state, saturated steam enters the superheater 9 to exchange heat with the hot molten salt, the saturated steam is heated to an overheated steam state to become supplementary steam supply and steam supply to the outside, and at the moment, industrial steam supply is provided by steam extraction, temperature reduction and supplementary steam supply of a steam turbine set.
In the energy release process, when the steam extraction temperature or pressure of a steam turbine unit is lower than an industrial steam supply parameter, a high-temperature molten salt flow control valve 8 is opened, a high-temperature molten salt circulating pump 7 pumps hot molten salt in an inclined temperature layer molten salt storage tank 1 into a superheater 9, an evaporator 10 and a preheater 11, high-temperature high-pressure feed water of a steam turbine is decompressed to steam supply pressure through a pressure regulating valve 12 and then enters the preheater 11 to exchange heat with the hot molten salt, water is heated to a saturated water state, saturated water enters the evaporator 10 to exchange heat with the hot molten salt, saturated water is heated to a saturated steam state, saturated steam enters the superheater 9 to exchange heat with the hot molten salt, the saturated steam is heated to a superheated steam state to be supplied with supplementary steam for external steam supply, and at the moment, all industrial steam supply is supplied by supplementary steam supply.
The heat storage peak regulation and energy-saving steam supply thermodynamic system in the embodiment solves the problem of guaranteeing the steam supply capacity when a thermal power generating unit participates in peak regulation; the method realizes thermoelectric decoupling by means of fused salt heat storage, ensures that the steam turbine set can continuously and stably supply steam under the peak regulation operation condition, and at least can ensure 3-5h steam supply in a deep regulation mode in consideration of economy.
The heat storage peak regulation and energy-saving steam supply thermodynamic system in the embodiment can store partial steam superheat degree, achieves the effect of waste heat storage and utilization, and can store the steam sensible heat superheat degree with the temperature difference ranging from 100 ℃ to 150 ℃.
The heat storage peak regulation and energy-saving steam supply thermodynamic system in the embodiment can meet the steam supply requirements of different levels of pressure, can adjust the steam supply pressure, and can adapt to the pressure change range of 1.5-4.0 MPa.
The heat storage peak regulation and energy-saving steam supply thermodynamic system in the embodiment can meet the steam supply requirements of different flow rates, the steam supply flow rate can be adjusted, and the system can adapt to the change of the steam supply flow rate which is less than or equal to 200 t/h.
In the heat storage peak regulation and energy-saving steam supply thermodynamic system in the embodiment, the power supply of the molten salt electric heating furnace can be from clean energy such as wind power, photoelectricity and the like, so that the new energy power consumption can be promoted, the wind and light abandonment is reduced, and the effects of energy saving, carbon reduction and environmental protection are achieved.
Claims (9)
1. A heat storage peak regulation and energy-saving steam supply thermodynamic system is characterized by comprising an inclined temperature layer molten salt storage tank (1), a low-temperature molten salt circulating pump (2), a first low-temperature molten salt flow control valve (3), a molten salt-steam heat exchanger (4), a second low-temperature molten salt flow control valve (5), a molten salt electric heating furnace (6), a high-temperature molten salt circulating pump (7), a high-temperature molten salt flow control valve (8), a superheater (9), an evaporator (10) and a preheater (11);
the thermocline molten salt storage tank (1) is a thermocline storage tank with a middle partition plate, the upper layer is used for storing hot molten salt, and the lower layer is used for storing cold molten salt; the upper layer of the thermocline molten salt storage tank (1) is provided with a high-temperature inlet and a high-temperature outlet, and the lower layer of the thermocline molten salt storage tank (1) is provided with a low-temperature outlet and a low-temperature inlet;
the low-temperature outlet of the thermocline molten salt storage tank (1) is connected with the inlet of the low-temperature molten salt circulating pump (2), and the outlet of the low-temperature molten salt circulating pump (2) is respectively connected with the inlets of the first low-temperature molten salt flow control valve (3) and the second low-temperature molten salt flow control valve (5); an outlet of the first low-temperature molten salt flow control valve (3) is connected with a molten salt inlet of the molten salt-steam heat exchanger (4), and a molten salt outlet of the molten salt-steam heat exchanger (4) is connected with a high-temperature inlet of the thermocline molten salt storage tank (1); a molten salt electric heating furnace (6) is arranged between the outlet of the second low-temperature molten salt flow control valve (5) and the high-temperature inlet of the thermocline molten salt storage tank (1);
the high-temperature outlet of the thermocline molten salt storage tank (1) is sequentially connected with the molten salt inlets of the high-temperature molten salt circulating pump (7), the high-temperature molten salt flow control valve (8) and the superheater (9), the molten salt outlet of the superheater (9) is connected with the molten salt inlet of the evaporator (10), the molten salt outlet of the evaporator (10) is connected with the molten salt inlet of the preheater (11), and the molten salt outlet of the preheater (11) is connected with the low-temperature inlet of the thermocline molten salt storage tank (1);
the steam outlet of the preheater (11) is connected with the steam inlet of the evaporator (10), the steam outlet of the evaporator (10) is connected with the steam inlet of the superheater (9), and the steam outlet of the superheater (9) is connected with the steam outlet of the molten salt-steam heat exchanger (4).
2. The system of claim 1, further comprising a pressure regulating valve (12), wherein one end of the pressure regulating valve (12) is connected to a steam inlet of the preheater (11), and the other end of the pressure regulating valve (12) is connected to high-temperature and high-pressure steam supply of the steam turbine.
3. The heat storage, peak regulation and energy-saving steam supply thermodynamic system as claimed in claim 1 further comprising a steam extraction control valve set (13), wherein one end of the steam extraction control valve set (13) is connected with a steam inlet of the molten salt-steam heat exchanger (4), and the other end is connected with steam extraction of the steam turbine set.
4. The heat storage, peak regulation and energy-saving steam supply thermodynamic system as claimed in claim 1, wherein the high-temperature molten salt flow control valve (8) is opened, the high-temperature molten salt circulating pump (7) pumps the hot molten salt in the thermocline molten salt storage tank (1) into the superheater (9), the hot molten salt flows into the evaporator (10) after being subjected to heat exchange with saturated steam and temperature reduction, flows into the preheater (11) after being subjected to heat exchange with saturated water and temperature reduction again, and flows out of the preheater (11) after being subjected to heat exchange with water and temperature reduction for the third time to become cold molten salt, and the cold molten salt returns to the thermocline molten salt storage tank (1).
5. The heat storage, peak regulation and energy-saving steam supply thermodynamic system according to claim 1, characterized in that in the energy storage process, the first low-temperature molten salt flow control valve (3) is opened, the low-temperature molten salt circulating pump (2) pumps cold molten salt in the thermocline molten salt storage tank (1) into the steam-molten salt heat exchanger (4) to exchange heat with steam extracted by a steam turbine set passing through the steam extraction control valve group (13) to form hot molten salt, and then the hot molten salt flows into the thermocline molten salt storage tank (1); in the process, the steam extraction of the steam turbine set is cooled to the steam supply parameter for supplying steam to the outside, and at the moment, all the industrial steam supply is supplied by the steam extraction and cooling of the steam turbine set.
6. The heat storage, peak regulation and energy-saving steam supply thermodynamic system according to claim 1, wherein in the energy storage process, the second low-temperature molten salt flow control valve (5) is opened, and the low-temperature molten salt circulating pump (2) pumps cold molten salt in the thermocline molten salt storage tank (1) into the molten salt electric heating furnace (6) to be heated into hot molten salt, and then the hot molten salt flows into the thermocline molten salt storage tank (1).
7. The heat storage, peak regulation and energy-saving steam supply thermodynamic system as claimed in claim 6, wherein the molten salt electric heating furnace (6) adopts clean electric energy or wave valley electricity.
8. The heat storage, peak regulation and energy-saving steam supply thermodynamic system as claimed in claim 1, wherein in the energy release process, when the steam extraction temperature and pressure of the steam turbine set are both higher than the industrial steam supply parameters and the flow is lower than the industrial steam supply parameters, the first low temperature molten salt flow control valve (3) is opened, the steam extraction of the steam turbine set exchanges heat with the cold molten salt entering the steam-molten salt heat exchanger (4) through the low temperature molten salt circulating pump (2) and the first low temperature molten salt flow control valve (3) via the steam extraction control valve set (13), so that the temperature of the steam extraction of the steam turbine set is reduced to the steam supply parameters for external steam supply; meanwhile, a high-temperature molten salt flow control valve (8) is opened, a high-temperature molten salt circulating pump (7) pumps hot molten salt in an inclined temperature layer molten salt storage tank (1) into a superheater (9), an evaporator (10) and a preheater (11), high-temperature and high-pressure water supply of a steam turbine is decompressed to steam supply pressure through a pressure regulating valve (12) and then enters the preheater (11) to exchange heat with the hot molten salt, water is heated to a saturated water state, the saturated water enters the evaporator (10) to exchange heat with the hot molten salt, the saturated water is heated to a saturated steam state, the saturated steam enters the superheater (9) to exchange heat with the hot molten salt, the saturated steam is heated to a superheated steam state to become supplementary steam supply for supplying steam to the outside, and at the moment, industrial steam supply is provided by steam turbine units for steam extraction and temperature reduction and supplementary steam supply.
9. The heat storage peak regulation and energy-saving steam supply thermodynamic system as claimed in claim 1, wherein in the energy release process, when the steam extraction temperature or pressure of the steam turbine set is lower than the industrial steam supply parameter, the high-temperature molten salt flow control valve (8) is opened, the high-temperature molten salt circulating pump (7) pumps the hot molten salt in the inclined temperature layer molten salt storage tank (1) into the superheater (9), the evaporator (10) and the preheater (11), the high-temperature high-pressure feed water of the steam turbine is decompressed to the steam supply pressure through the pressure regulating valve (12) and then enters the preheater (11) to exchange heat with the hot molten salt, the water is heated to a saturated water state, the saturated water enters the evaporator (10) to exchange heat with the hot molten salt, the saturated water is heated to a saturated steam state, the saturated steam enters the superheater (9) to exchange heat with the hot molten salt, the saturated steam is heated to a superheated steam state to supply steam to the outside, and the industrial steam supply is completely provided by the supplementary steam at this time.
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