CN114233417B - Heat storage type deep flexible peak regulation thermal power generation system and heat storage and release method - Google Patents
Heat storage type deep flexible peak regulation thermal power generation system and heat storage and release method Download PDFInfo
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- 238000005338 heat storage Methods 0.000 title claims abstract description 60
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- 238000010248 power generation Methods 0.000 title claims abstract description 30
- 150000003839 salts Chemical class 0.000 claims abstract description 211
- 238000002485 combustion reaction Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 51
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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
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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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
- F01K13/00—General layout or general methods of operation of complete plants
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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
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Abstract
The invention discloses a heat storage type deep flexible peak regulation thermal power generation system and a heat storage and release method. The system comprises a boiler, a steam turbine, a generator, a condensate pump, a low-pressure heater group, a deaerator, a high-pressure heater group, a high-temperature molten salt tank, a low-temperature molten salt tank, a molten salt pump group, a steam-salt heat exchanger, a water-salt heat exchanger, a phase-change heat exchanger and the like. During the power consumption valley period of a power grid, when the stable combustion load of a boiler is greater than the load of a steam turbine, the surplus heat is stored in a double-tank molten salt heat storage system; during the period that the power grid uses electricity in a non-valley mode, the double-tank molten salt heat storage system releases stored heat, and generated steam is sent to the steam turbine to do work. The system and the method solve the problem that the lowest loads of a boiler and a steam turbine of the thermal power generator unit are not matched during the power consumption valley period of a power grid through the double-tank molten salt heat storage system, realize that the boiler operates above a stable combustion load working condition, realize that the steam turbine generator unit operates under an extremely low load working condition, and achieve the purpose of deep, rapid and flexible peak regulation of the thermal power generator unit.
Description
Technical Field
The invention belongs to the field of power generation, and particularly relates to a heat storage type deep flexible peak shaving thermal power generation system and a heat storage and release method.
Background
Under the important strategic background of carbon peaking and carbon neutralization in China, the large-scale development and high-quality development of new energy power generation are comprehensively promoted, and the total installed capacity of wind power and solar power generation in China reaches more than 12 hundred million kilowatts by 2030. The fluctuation of wind power and photovoltaic power generation is large, and the peak-to-valley demand of the electric load is difficult to match, so that the peak-load regulation pressure of the power system is obviously increased. At present, a main unit for peak regulation of electric power is a thermal power unit, but the thermal power unit is limited by the minimum stable combustion load of a key device, namely a boiler, and during the power consumption valley period of a power grid, a thermal power unit is difficult to continuously maintain the operation under the low-load working condition, so that the peak regulation capability of the thermal power unit is greatly influenced. Particularly, when the power generation ratio of new energy is continuously increased, the ratio of the thermal power generating unit is relatively reduced, and the power grid puts higher requirements on the peak regulation depth of the thermal power generating unit. Therefore, technical means are needed to improve the capacity of deep peak shaving of the unit.
The depth of the thermal power generator set participating in peak shaving is mainly limited by stable combustion of the boiler, and the solving ways are divided into two categories, namely, the stable combustion load of the boiler is reduced through the body modification of the boiler, particularly the stable combustion modification of a combustion system, so that the purpose of deep peak shaving is achieved; and secondly, the excess heat of the boiler is utilized by adopting a technical means, such as a reasonable heat supply mode or an energy storage mode. Meanwhile, the two ways are used simultaneously, so that the peak shaving depth of the unit can be further improved.
The energy storage technology mainly comprises the modes of pumped storage, compressed air storage, flywheel storage, electrochemical storage, heat storage and the like, and the storage is mainly carried out in the forms of potential energy, mechanical energy, electric energy and heat energy. In thermal power plants, heat storage is a relatively suitable form of energy storage. The fused salt energy storage system has mature commercial application in a solar photo-thermal power station, the heat storage temperature is matched with the temperature of a thermal power generator set, and the fused salt energy storage system is a relatively suitable energy storage mode.
The double-tank molten salt heat storage system is adopted to store the excess energy of the boiler, so that the balance of the lowest stable operation load of the unit boiler and the steam turbine is achieved, heat is released during non-valley power utilization, steam is heated, the steam turbine is driven to do work, and the purpose of deep, rapid and flexible peak regulation of the thermal power generator set is achieved under the condition of small energy loss.
Disclosure of Invention
The invention aims to provide a heat storage type deep flexible peak regulation thermal power generation system and a heat storage and release method.
The invention provides a heat storage type thermal power generation system with flexible depth peak regulation, which comprises a boiler, a steam turbine, a condenser, a generator, a condensate pump, a low-pressure heater group, a deaerator, a water feed pump, a high-pressure heater group, a high-temperature molten salt tank, a low-temperature molten salt pump, a high-temperature molten salt pump, a first vapor-salt heat exchanger, a second vapor-salt heat exchanger, a third vapor-salt heat exchanger, a water-salt heat exchanger, a first phase-change heat exchanger, a second phase-change heat exchanger and a fourth vapor-salt heat exchanger; wherein, a superheater (1-1) of the boiler (1) is connected with an inlet of a high-pressure cylinder (2-1) of a steam turbine (2) through a steam pipeline, an outlet of the high-pressure cylinder (2-1) is connected with an inlet of a reheater (1-2) of the boiler (1), and an outlet of the reheater (1-2) is connected with an inlet of a medium-low pressure cylinder (2-2) of the steam turbine (2); the steam turbine (2) is connected with the generator (3) in a mechanical mode, the exhaust steam of the medium and low pressure cylinder (2-2) of the steam turbine (2) is connected to the condenser (4), the condensed water of the condenser (4) is connected with the condensed water pump (5) through a pipeline, then is sequentially connected to the low-pressure heater group (6), the deaerator (7) and the water feed pump (8) through pipelines, and finally is connected to the boiler (1) through a pipeline, so that steam power circulation is realized; the low-temperature molten salt tank (10) is connected with a low-temperature molten salt pump (11) through a pipeline, the outlet of the low-temperature molten salt pump (11) is divided into two pipelines, one pipeline is connected with a first vapor-salt heat exchanger (14), and then the other pipeline is connected with the high-temperature molten salt tank (12) through a pipeline; the other path is connected with a first phase-change heat exchanger (16), a fused salt outlet pipeline of the first phase-change heat exchanger (16) is connected with a second vapor-salt heat exchanger (15), and a fused salt outlet of the second vapor-salt heat exchanger (15) is connected to a high-temperature fused salt tank (12) through a pipeline; the steam end of the first steam-salt heat exchanger (14) is respectively connected with the outlet of a superheater (1-1) of the boiler (1) and the inlet of a reheater (1-2) through pipelines; the steam inlet end of the second steam-salt heat exchanger (15) is connected to the outlet of a reheater (1-2) of the boiler (1) through a pipeline, the steam outlet is connected to the first phase-change heat exchanger (16) through a pipeline, and the water side outlet of the first phase-change heat exchanger (16) is connected to the deaerator (7); the high-temperature molten salt tank (12) is connected with the high-temperature molten salt pump (13) through a pipeline, and an outlet pipeline of the high-temperature molten salt pump (13) is divided into two paths: one path is connected to a third vapor-salt heat exchanger (17), a second phase heat exchanger (18) and a water-salt heat exchanger (19) in sequence, and is finally connected to a low-temperature molten salt tank (10) through a pipeline; the other routing pipeline is connected to a fourth vapor-salt heat exchanger (20) and then connected to the low-temperature molten salt tank (10); the steam inlet end of the fourth steam-salt heat exchanger is connected to a steam exhaust pipeline of a high-pressure cylinder (2-1) of the steam turbine (2) through a pipeline, and the outlet end of the fourth steam-salt heat exchanger is connected to a medium-low pressure cylinder (2-2); the water inlet end of the water salt heat exchanger (19) is connected to an outlet pipeline of the high-pressure heater group (9) through a pipeline, the water outlet end of the water salt heat exchanger (19) is connected to the water inlet end of the second phase heat exchanger (18) through a pipeline, the steam outlet end of the second phase heat exchanger (18) is connected to the steam inlet end of the third steam salt heat exchanger (17) through a pipeline, and the steam outlet end of the third steam salt heat exchanger (17) is connected to the steam inlet pipeline of the high-pressure cylinder (2-1) through a pipeline.
According to the heat storage type thermal power generation system with the flexible depth peak regulation function, steam flowing out of a superheater (1-1) of a boiler (1) is divided into two paths, one path of the steam enters a high-pressure cylinder (2-1) of a steam turbine (2) to do work, the other path of the steam enters a first steam-salt heat exchanger (14), heat is released to heat molten salt, and then the molten salt returns to an inlet of a reheater (1-2) of the boiler; the steam at the outlet of the boiler reheater (1-2) is divided into two paths, and one path of the steam enters the low-pressure cylinder (2-2) in the steam turbine to do work; the other path of the water flows through a second vapor-salt heat exchanger (15) and a first phase-change heat exchanger (16) in sequence, releases heat to heat molten salt to form water, and flows to a deaerator (7) along a pipeline; after the pressure of low-temperature molten salt in the low-temperature molten salt tank (10) is increased by a low-temperature molten salt pump (11), the low-temperature molten salt is divided into two paths: one path of the steam flows to the high-temperature molten salt tank (12) after flowing through the first phase-change heat exchanger (16) and the second vapor-salt heat exchanger (15) in sequence and performing reverse heat exchange with the steam; the other path flows to the high-temperature molten salt tank (12) after flowing through the first vapor-salt heat exchanger (14) to absorb heat; and realizing a heat storage process.
According to the heat storage type thermal power generation system with the flexible peak regulation depth, high-temperature molten salt stored in a high-temperature molten salt tank (12) of the system is boosted by a high-temperature molten salt pump (13) and then divided into two paths: the first path enters a third steam-salt heat exchanger (17), a second phase heat exchanger (18) and a water-salt heat exchanger (19) in sequence, releases the heat of the molten salt to become low-temperature molten salt, and flows to a low-temperature molten salt tank (10); the second path enters a fourth steam-salt heat exchanger (20) to discharge molten salt heat, and formed low-temperature molten salt flows to a low-temperature molten salt tank (10); the two molten salt flows realize the heat release flow of the molten salt; boiler feed water from a high-pressure heater group (9) firstly flows through a water-salt heat exchanger (19) for preheating, preheated water flows are evaporated into steam through a second phase heat exchanger (18), the steam flows through a third steam-salt heat exchanger (17) for superheating, and the generated superheated steam is mixed with superheated steam produced by a boiler superheater (1-1) and sent to a high-pressure cylinder (2-1) of a steam turbine (2) for doing work; after exhaust steam from the high-pressure cylinder (2-1) enters the fourth steam-salt heat exchanger (20) to absorb heat of molten salt, the temperature is increased, and the exhaust steam is mixed with steam at the outlet of the boiler reheater (1-2) and sent to the medium-low pressure cylinder (2-2) to do work; realizing the heat absorption process of the steam.
The heat storage type deep flexible peak regulation thermal power generation system heat storage and release method is provided, the power generation system is used, when the stable combustion load of the boiler (1) is larger than the load demand of the steam turbine (2), the part of the boiler (1) outputting more heat than the demand of the steam turbine (2) is stored in a molten salt heat storage mode; when the heat demand of the steam turbine (2) is higher than the stable combustion load of the boiler (1), releasing the heat stored in the molten salt, heating the feed water and the steam to generate high-temperature steam, and sending the high-temperature steam into the steam turbine (2) to do work; in the heat storage process, a heat storage and exchange system consisting of a first vapor-salt heat exchanger (14), a second vapor-salt heat exchanger (15), a first phase change heat exchanger (16) and a connecting pipeline is connected in parallel with a steam turbine system consisting of a high-pressure cylinder (2-1), a medium-low pressure cylinder (2-2) and a connecting pipeline, and steam at the outlet of a superheater (1-1) and a reheater (1-2) of a boiler (1) is respectively sent to a steam turbine (2) to do work and the heat storage and exchange system to store heat; the heat release process adopts a parallel connection mode of a boiler system comprising a superheater (1-1) and a reheater (1-2) and a molten salt boiler system comprising a third vapor-salt heat exchanger (17), a second phase heat exchanger (18), a water-salt heat exchanger (19), a fourth vapor-salt heat exchanger (20) and a connecting pipeline, and steam at the outlet of the boiler superheater (1-1) and steam at the outlet of the third vapor-salt heat exchanger (17) are mixed and enter a high-pressure cylinder (2-1) of the steam turbine to do work; steam at the outlet of the boiler reheater (1-2) and steam at the outlet of the fourth steam-salt heat exchanger (20) are mixed and enter the medium-low pressure cylinder (2-2) to do work; the method solves the contradiction of different lowest stable operation loads of the boiler and the steam turbine, can carry out deep peak shaving according to the lowest load of the steam turbine (2), reduces heat loss during peak shaving and improves the fuel utilization rate.
The heat storage and release method of the heat storage type deep flexible peak regulation thermal power generation system comprises the following two parts: the first part is superheated steam at an outlet of a superheater (1-1) of the boiler (1) and enters a first steam-salt heat exchanger (14), and the steam after heat release returns to an inlet of a reheater (1-2); the low-temperature molten salt enters a first vapor-salt heat exchanger (14) after being boosted by a low-temperature molten salt pump (11) from a low-temperature molten salt tank (10), and the high-temperature molten salt absorbing heat flows into a high-temperature molten salt tank (12) for storage; the second part is that reheat steam of reheater (1-2) export of boiler (1) gets into second vapour and salt heat exchanger (15) and first phase change heat exchanger (16) in order and releases heat, and the condensate water is retrieved to oxygen-eliminating device (7), and low temperature fused salt gets into first phase change heat exchanger (16) and second vapour and salt heat exchanger (15) in order against the current after low temperature fused salt boosts from low temperature fused salt jar (10) through low temperature fused salt pump (11), and the high temperature fused salt after the heat absorption flows into high temperature fused salt jar (12) and stores.
The heat storage and release method of the heat storage type deep flexible peak regulation thermal power generation system comprises the following two parts: the first part is high-temperature molten salt of the high-temperature molten salt tank (12) and flows through a third vapor-salt heat exchanger (17), a second phase heat exchanger (18) and a water-salt heat exchanger (19) in sequence after being boosted by a high-temperature molten salt pump (13), and the low-temperature molten salt after releasing heat flows into the low-temperature molten salt tank (10); the feed water from the high-pressure heater group (9) flows through a water-salt heat exchanger (19), a second phase heat exchanger (18) and a third steam-salt heat exchanger (17) in sequence to absorb heat to generate superheated steam, and the superheated steam is mixed with a boiler superheater (1-1) and then sent to an inlet of a steam turbine high-pressure cylinder (2-1); the second part is that the high-temperature molten salt of the high-temperature molten salt tank (12) flows into the fourth vapor salt heat exchanger (20) after being boosted by the high-temperature molten salt pump (13), and the low-temperature molten salt after releasing heat flows into the low-temperature molten salt tank (10).
The invention has the beneficial effects that:
the invention relates to a heat storage type deep flexible peak regulation thermal power generation system heat storage and release method. The invention can store part of heat of the boiler higher than the load requirement of the steam turbine in a high-temperature form and store the part of heat in the molten salt heat storage system under the condition that the lowest stable operation load of the boiler and the steam turbine is not matched, so that the thermal generator set supplies power to a power grid by the lowest load of the steam turbine, and the purpose of deep peak regulation of the thermal generator set is achieved. During the load valley period of the power grid, the rapid load reduction capability of the thermal power generator unit is greatly improved through the parallel operation of the energy storage system and the steam turbine generator unit. During the period of low load cost of the power grid, the rapid load-increasing capacity of the thermal power generator set is greatly improved through the parallel operation of the energy storage system and the boiler system. Because the heat storage temperature is matched with the main steam and the reheated steam temperature of the steam turbine generator set, the loss of the work capacity of the boiler heat can be greatly reduced. The invention is not only suitable for the newly built thermal power generation system with deep peak regulation capability, but also can be used for the deep peak regulation reconstruction of the existing thermal power generation system.
Drawings
Fig. 1 is a schematic structural diagram of a thermal storage type deep flexible peak shaving thermal power generation system.
In the figure, a boiler 1, a superheater 1-1, a reheater 1-2, a steam turbine 2, a high-pressure cylinder 2-1, a low-pressure cylinder 2-2, a generator 3, a condenser 4, a condensate pump 5, a low-pressure heater group 6, a deaerator 7, a feed water pump 8, a high-pressure heater group 9, a low-temperature molten salt tank 10, a low-temperature molten salt pump 11, a high-temperature molten salt tank 12, a high-temperature molten salt pump 13, a first vapor-salt heat exchanger 14, a second vapor-salt heat exchanger 15, a first phase-change heat exchanger 16, a third vapor-salt heat exchanger 17, a second phase-change heat exchanger 18, a water-salt heat exchanger 19 and a fourth vapor-salt heat exchanger 20 are provided.
Detailed Description
The invention provides a heat storage type deep flexible peak regulation thermal power generation system and a heat storage and release method.
The invention is described in further detail below with reference to the figures and specific embodiments.
Example 1
Fig. 1 is a schematic diagram of a structural form of a heat storage type deep flexible peak shaving thermal power generation system, and the system is composed of a boiler 1, a steam turbine 2, a condenser 4, a generator 3, a condensate pump 5, a low-pressure heater group 6, a deaerator 7, a water feed pump 8, a high-pressure heater group 9, a high-temperature molten salt tank 12, a low-temperature molten salt tank 10, a low-temperature molten salt pump 11, a high-temperature molten salt pump 13, a first vapor-salt heat exchanger 14, a second vapor-salt heat exchanger 15, a third vapor-salt heat exchanger 17, a water-salt heat exchanger 19, a first phase-change heat exchanger 16, a second phase-change heat exchanger 18, a fourth vapor-salt heat exchanger 20, a pipeline, a valve and accessories.
The structure and connection relationship of the system of the embodiment. A superheater 1-1 of a boiler 1 is connected with an inlet of a high-pressure cylinder 2-1 of a steam turbine 2 through a steam pipeline, an outlet of the high-pressure cylinder 2-1 is connected with an inlet of a reheater 1-2 of the boiler 1, and an outlet of the reheater 1-2 is connected with an inlet of a medium-low pressure cylinder 2-2 of the steam turbine 2; the steam turbine 2 is mechanically connected with the generator 3, the exhaust steam of the medium and low pressure cylinder 2-2 of the steam turbine 2 is connected to the condenser 4, the condensed water of the condenser 4 is connected with the condensed water pump 5 through a pipeline, and then is sequentially connected to the low-pressure heater group 6, the deaerator 7 and the feed pump 8 through pipelines, and finally is connected to the boiler 1 through a pipeline, so that the steam power circulation is realized; the low-temperature molten salt tank 10 is connected with a low-temperature molten salt pump 11 through a pipeline, the outlet of the low-temperature molten salt pump 11 is divided into two pipelines, one pipeline is connected with a first vapor-salt heat exchanger 14, and then the other pipeline is connected with a high-temperature molten salt tank 12 through a pipeline; the other path is connected with a first phase-change heat exchanger 16, a fused salt outlet pipeline of the first phase-change heat exchanger 16 is connected with a second vapor-salt heat exchanger 15, and a fused salt outlet of the second vapor-salt heat exchanger 15 is connected to the high-temperature fused salt tank 12 through a pipeline; the steam end of the first steam-salt heat exchanger 14 is respectively connected with the outlet of a superheater 1-1 of the boiler 1 and the inlet of a reheater 1-2 through pipelines; the steam inlet end of the second steam-salt heat exchanger 15 is connected to an outlet of a reheater 1-2 of the boiler 1 through a pipeline, a steam outlet is connected to a steam inlet end of the first phase-change heat exchanger 16 through a pipeline, and a water side outlet of the first phase-change heat exchanger 16 is connected to the deaerator 7; the high-temperature molten salt tank 12 is connected with the high-temperature molten salt pump 13 by a pipeline, and an outlet pipeline of the high-temperature molten salt pump 13 is divided into two paths: one path is connected to a third vapor-salt heat exchanger 17, a second phase heat exchanger 18 and a water-salt heat exchanger 19 in sequence, and is finally connected to the low-temperature molten salt tank 10 through a pipeline; the other routing pipeline is connected to the fourth vapor-salt heat exchanger 20 and then connected to the low-temperature molten salt tank 10; the steam inlet end of the fourth steam-salt heat exchanger 20 is connected to a steam exhaust pipeline of a high-pressure cylinder 2-1 of the steam turbine 2 through a pipeline, and the outlet end of the fourth steam-salt heat exchanger is connected to a medium-low pressure cylinder 2-2; the water inlet end of the water salt heat exchanger 19 is connected to the outlet pipeline of the high-pressure heater group 9 through a pipeline, the water outlet end of the water salt heat exchanger 19 is connected to the water inlet end of the second phase heat exchanger 18 through a pipeline, the steam outlet end of the second phase heat exchanger 18 is connected to the steam inlet end of the third steam salt heat exchanger 17 through a pipeline, and the steam outlet end of the third steam salt heat exchanger 17 is connected to the steam inlet pipeline of the high-pressure cylinder 2-1 through a pipeline.
The heat storage working medium flow of the embodiment. The steam flowing out of the superheater 1-1 of the boiler 1 is divided into two paths, one path of the steam enters a high-pressure cylinder 2-1 of a steam turbine 2 to do work, the other path of the steam enters a first steam-salt heat exchanger 14 to release heat to heat molten salt, and then the steam returns to an inlet of a reheater 1-2 of the boiler; the steam at the outlet of the boiler reheater 1-2 is divided into two paths, and one path of the steam enters the low pressure cylinder 2-2 of the steam turbine to do work; the other path of water sequentially flows through a second vapor-salt heat exchanger 15 and a first phase-change heat exchanger 16, releases heat to heat molten salt to form water, and flows to a deaerator 7 along a pipeline; after the low-temperature molten salt in the low-temperature molten salt tank 10 is boosted by the low-temperature molten salt pump 11, the low-temperature molten salt is divided into two paths: one path of the steam flows to the high-temperature molten salt tank 12 after flowing through the first phase-change heat exchanger 16 and the second vapor-salt heat exchanger 15 in sequence and performing reverse heat exchange with the steam; the other path flows to the high-temperature molten salt tank 12 after flowing through the first vapor-salt heat exchanger 14 to absorb heat; and realizing a heat storage process.
The heat releasing working medium flow of the present embodiment. The high-temperature molten salt stored in the high-temperature molten salt tank 12 of the system is boosted by a high-temperature molten salt pump 13 and then divided into two paths: the first path enters a third steam-salt heat exchanger 17, a second phase heat exchanger 18 and a water-salt heat exchanger 19 in sequence, releases the heat of the molten salt to become low-temperature molten salt, and flows to a low-temperature molten salt tank 10; the second path enters a fourth steam-salt heat exchanger 20 to discharge molten salt heat, and formed low-temperature molten salt flows to a low-temperature molten salt tank 10; the two molten salt flows realize the heat release flow of the molten salt; boiler feed water from the high-pressure heater group 9 firstly flows through a water-salt heat exchanger 19 to be preheated, preheated water flows are evaporated into steam through a second phase heat exchanger 18, the steam flows through a third steam-salt heat exchanger 17 to be superheated, and the generated superheated steam is mixed with superheated steam produced by a boiler superheater 1-1 and is sent to a high-pressure cylinder 2-1 of a steam turbine 2 to do work; after exhaust steam from the high-pressure cylinder 2-1 enters the fourth steam-salt heat exchanger 20 to absorb heat of molten salt, the temperature is increased, and the exhaust steam is mixed with steam at the outlet of the boiler reheater 1-2 and sent to the medium-low pressure cylinder 2-2 to do work; realizing the heat absorption process of the steam.
The heat storage and release method of the embodiment. When the stable combustion load of the boiler 1 is larger than the load demand of the steam turbine 2, storing the part of the boiler 1 outputting heat more than the demand of the steam turbine 2 by adopting a molten salt heat storage mode, releasing the heat stored in the molten salt when the heat demand of the steam turbine 2 is higher than the stable combustion load of the boiler 1, heating feed water and steam to generate high-temperature steam, and sending the high-temperature steam into the steam turbine 2 to do work; in the heat storage process, a heat storage and exchange system consisting of a first vapor-salt heat exchanger 14, a second vapor-salt heat exchanger 15, a first phase change heat exchanger 16 and a connecting pipeline is connected in parallel with a steam turbine system consisting of a high-pressure cylinder 2-1, a medium-low pressure cylinder 2-2 and a connecting pipeline, and steam at the outlets of a superheater 1-1 and a reheater 1-2 of a boiler 1 is respectively sent to a steam turbine 2 to do work and the heat storage and exchange system to store heat; in the heat release process, a boiler system comprising a superheater 1-1 and a reheater 1-2 and a molten salt boiler system comprising a third steam-salt heat exchanger 17, a second phase heat exchanger 18, a water-salt heat exchanger 19, a fourth steam-salt heat exchanger 20 and a connecting pipeline are connected in parallel, and steam at an outlet of the boiler superheater 1-1 and steam at an outlet of the third steam-salt heat exchanger 17 are mixed and enter a high-pressure cylinder 2-1 of the steam turbine for acting; mixing the steam at the outlet of the boiler reheater 1-2 and the steam at the outlet of the fourth steam-salt heat exchanger 20, and feeding the mixed steam into the medium-low pressure cylinder 2-2 for acting; the method solves the contradiction of different lowest stable operation loads of the boiler and the steam turbine, can carry out deep peak regulation according to the lowest load of the steam turbine 2, reduces heat loss during peak regulation and improves the fuel utilization rate.
The heat storage method of the present embodiment. The heat storage process is divided into two parts: the superheated steam of the first part, which is the outlet of the superheater 1-1 of the boiler 1, enters a first steam-salt heat exchanger 14, the steam after heat release returns to the inlet of a reheater 1-2, the low-temperature molten salt enters the first steam-salt heat exchanger 14 after being boosted by a low-temperature molten salt pump 11 from a low-temperature molten salt tank 10, and the high-temperature molten salt after heat absorption flows into a high-temperature molten salt tank 12 for storage; the second part is that reheat steam at the outlet of a reheater 1-2 of the boiler 1 sequentially enters a second vapor-salt heat exchanger 15 and a first phase-change heat exchanger 16 to release heat, condensed water is recovered to a deaerator 7, low-temperature molten salt is boosted by a low-temperature molten salt pump 11 from a low-temperature molten salt tank 10 and then sequentially enters the first phase-change heat exchanger 16 and the second vapor-salt heat exchanger 15 in a countercurrent mode, and the high-temperature molten salt after heat absorption flows into a high-temperature molten salt tank 12 to be stored.
The heat release method of this example. The heat release process is divided into two parts: the first part is high-temperature molten salt of a high-temperature molten salt tank (12) and flows through a third vapor-salt heat exchanger 17, a second phase heat exchanger 18 and a water-salt heat exchanger 19 in sequence after being boosted by a high-temperature molten salt pump 13, and the low-temperature molten salt after releasing heat flows into a low-temperature molten salt tank 10; the feed water from the high-pressure heater group 9 sequentially flows through the water-salt heat exchanger 19, the second phase heat exchanger 18 and the third steam-salt heat exchanger 17 to absorb heat, generate superheated steam, and is mixed with the boiler superheater 1-1 and then sent to the inlet of the high-pressure cylinder 2-1 of the steam turbine; the second part is that the high-temperature molten salt in the high-temperature molten salt tank 12 is pressurized by the high-temperature molten salt pump 13 and then flows into the fourth vapor-salt heat exchanger 20, and the low-temperature molten salt after releasing heat flows into the low-temperature molten salt tank 10.
The invention has not been described in detail and is part of the common general knowledge of a person skilled in the art. The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and the preferred embodiments are not exhaustive and do not limit the invention to the precise embodiments described. Various modifications and improvements of the technical solution of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and the technical solution of the present invention is to be covered by the protection scope defined by the claims.
Claims (6)
1. The heat storage type deep flexible peak shaving thermal power generation system is characterized by comprising a boiler (1), a steam turbine (2), a condenser (4), a generator (3), a condensate pump (5), a low-pressure heater group (6), a deaerator (7), a water feeding pump (8), a high-pressure heater group (9), a high-temperature molten salt tank (12), a low-temperature molten salt tank (10), a low-temperature molten salt pump (11), a high-temperature molten salt pump (13), a first vapor-salt heat exchanger (14), a second vapor-salt heat exchanger (15), a third vapor-salt heat exchanger (17), a water-salt heat exchanger (19), a first phase-change heat exchanger (16), a second phase-change heat exchanger (18) and a fourth vapor-salt heat exchanger (20); wherein, a superheater (1-1) of the boiler (1) is connected with an inlet of a high-pressure cylinder (2-1) of a steam turbine (2) through a steam pipeline, an outlet of the high-pressure cylinder (2-1) is connected with an inlet of a reheater (1-2) of the boiler (1), and an outlet of the reheater (1-2) is connected with an inlet of a medium-low pressure cylinder (2-2) of the steam turbine (2); the steam turbine (2) is connected with the generator (3) in a mechanical mode, the exhaust steam of the medium and low pressure cylinder (2-2) of the steam turbine (2) is connected to the condenser (4), the condensed water of the condenser (4) is connected with the condensed water pump (5) through a pipeline, then is sequentially connected to the low-pressure heater group (6), the deaerator (7) and the water feed pump (8) through pipelines, and finally is connected to the boiler (1) through a pipeline, so that steam power circulation is realized; the low-temperature molten salt tank (10) is connected with a low-temperature molten salt pump (11) through a pipeline, the outlet of the low-temperature molten salt pump (11) is divided into two pipelines, one pipeline is connected with a first vapor-salt heat exchanger (14), and then the other pipeline is connected with the high-temperature molten salt tank (12) through a pipeline; the other path is connected with a first phase-change heat exchanger (16), a fused salt outlet pipeline of the first phase-change heat exchanger (16) is connected with a second vapor-salt heat exchanger (15), and a fused salt outlet of the second vapor-salt heat exchanger (15) is connected to a high-temperature fused salt tank (12) through a pipeline; the steam end of the first steam-salt heat exchanger (14) is respectively connected with the outlet of a superheater (1-1) of the boiler (1) and the inlet of a reheater (1-2) through pipelines; the steam inlet end of the second steam-salt heat exchanger (15) is connected to the outlet of a reheater (1-2) of the boiler (1) through a pipeline, the steam outlet is connected to the first phase-change heat exchanger (16) through a pipeline, and the water side outlet of the first phase-change heat exchanger (16) is connected to the deaerator (7); the high-temperature molten salt tank (12) is connected with the high-temperature molten salt pump (13) through a pipeline, and an outlet pipeline of the high-temperature molten salt pump (13) is divided into two paths: one path is connected to a third vapor-salt heat exchanger (17), a second phase heat exchanger (18) and a water-salt heat exchanger (19) in sequence, and is finally connected to a low-temperature molten salt tank (10) through a pipeline; the other route is connected to a fourth vapor-salt heat exchanger (20) through a pipeline and then connected to a low-temperature molten salt tank (10); the steam inlet end of the fourth steam-salt heat exchanger (20) is connected to a steam exhaust pipeline of a high-pressure cylinder (2-1) of the steam turbine (2) through a pipeline, and the outlet end of the fourth steam-salt heat exchanger is connected to the medium-low pressure cylinder (2-2); the water inlet end of the water salt heat exchanger (19) is connected to an outlet pipeline of the high-pressure heater group (9) through a pipeline, the water outlet end of the water salt heat exchanger (19) is connected to the water inlet end of the second phase heat exchanger (18) through a pipeline, the steam outlet end of the second phase heat exchanger (18) is connected to the steam inlet end of the third steam salt heat exchanger (17) through a pipeline, and the steam outlet end of the third steam salt heat exchanger (17) is connected to the steam inlet pipeline of the high-pressure cylinder (2-1) through a pipeline.
2. The heat storage type deep flexible peak shaving thermal power generation system according to claim 1, wherein steam flowing out of a superheater (1-1) of a boiler (1) is divided into two paths, one path enters a high-pressure cylinder (2-1) of a steam turbine (2) to do work, and the other path enters a first steam-salt heat exchanger (14) to heat molten salt and then returns to an inlet of a reheater (1-2) of the boiler; the steam at the outlet of a reheater (1-2) of the boiler is divided into two paths, and one path of the steam enters a medium-low pressure cylinder (2-2) of the steam turbine to do work; the other path of the water flows through a second vapor-salt heat exchanger (15) and a first phase-change heat exchanger (16) in sequence, releases heat to heat molten salt to form water, and flows to a deaerator (7) along a pipeline; after the low-temperature molten salt in the low-temperature molten salt tank (10) is boosted by a low-temperature molten salt pump (11), the low-temperature molten salt is divided into two paths: one path of the steam flows to the high-temperature molten salt tank (12) after flowing through the first phase-change heat exchanger (16) and the second vapor-salt heat exchanger (15) in sequence and performing reverse heat exchange with the steam; the other path flows to the high-temperature molten salt tank (12) after flowing through the first vapor-salt heat exchanger (14) to absorb heat; and realizing a heat storage process.
3. The thermal storage type thermal power generation system with the depth flexible peak regulation function as claimed in claim 1, wherein the high-temperature molten salt stored in a high-temperature molten salt tank (12) of the system is boosted by a high-temperature molten salt pump (13) and then divided into two paths: the first path enters a third steam-salt heat exchanger (17), a second phase heat exchanger (18) and a water-salt heat exchanger (19) in sequence, releases the heat of the molten salt to become low-temperature molten salt, and flows to a low-temperature molten salt tank (10); the second path enters a fourth steam-salt heat exchanger (20) to discharge molten salt heat, and formed low-temperature molten salt flows to a low-temperature molten salt tank (10); the two molten salt flows realize the heat release flow of the molten salt; boiler feed water from a high-pressure heater group (9) firstly flows through a water-salt heat exchanger (19) for preheating, preheated water flows are evaporated into steam through a second phase heat exchanger (18), the steam flows through a third steam-salt heat exchanger (17) for superheating, and the generated superheated steam is mixed with superheated steam produced by a superheater (1-1) of the boiler and sent to a high-pressure cylinder (2-1) of a steam turbine (2) for doing work; after exhaust steam from the high-pressure cylinder (2-1) enters the fourth steam-salt heat exchanger (20) to absorb heat of molten salt, the temperature is increased, and the exhaust steam is mixed with steam at an outlet of a reheater (1-2) of the boiler and sent to the medium-low pressure cylinder (2-2) to do work; realizing the heat absorption process of the steam.
4. A heat storage type deep flexible peak regulation thermal power generation system heat storage and release method, characterized in that, the power generation system according to any one of claims 1-3 is used, when the stable combustion load of the boiler (1) is larger than the load demand of the steam turbine (2), the part of the boiler (1) outputting more heat than the demand of the steam turbine (2) is stored by adopting a molten salt heat storage mode; when the heat demand of the steam turbine (2) is higher than the stable combustion load of the boiler (1), releasing the heat stored in the molten salt, heating feed water and steam to generate high-temperature steam, and sending the high-temperature steam into the steam turbine (2) to do work; in the heat storage process, a heat storage and exchange system consisting of a first vapor-salt heat exchanger (14), a second vapor-salt heat exchanger (15), a first phase change heat exchanger (16) and a connecting pipeline is connected in parallel with a steam turbine system consisting of a high-pressure cylinder (2-1), a medium-low pressure cylinder (2-2) and a connecting pipeline, and steam at the outlet of a superheater (1-1) and a reheater (1-2) of a boiler (1) is respectively sent to a steam turbine (2) to do work and the heat storage and exchange system to store heat; the heat release process adopts a parallel connection mode of a boiler system comprising a superheater (1-1) and a reheater (1-2) and a molten salt boiler system comprising a third vapor-salt heat exchanger (17), a second phase heat exchanger (18), a water-salt heat exchanger (19), a fourth vapor-salt heat exchanger (20) and a connecting pipeline, and steam at the outlet of the superheater (1-1) and steam at the outlet of the third vapor-salt heat exchanger (17) of the boiler are mixed and enter a high-pressure cylinder (2-1) of a steam turbine to do work; steam at the outlet of a reheater (1-2) of the boiler and steam at the outlet of a fourth steam-salt heat exchanger (20) are mixed and enter a medium-low pressure cylinder (2-2) to do work.
5. The heat storage and release method of the heat storage type deep flexible peak shaving thermal power generation system according to claim 4, wherein the heat storage process is divided into two parts: the first part is that the superheated steam of the superheater (1-1) outlet of the boiler (1) enters a first vapor-salt heat exchanger (14), the steam after releasing heat returns to the inlet of a reheater (1-2), the low-temperature molten salt enters the first vapor-salt heat exchanger (14) after being boosted by a low-temperature molten salt pump (11) from a low-temperature molten salt tank (10), and the high-temperature molten salt after absorbing heat flows into a high-temperature molten salt tank (12) for storage; the second part is that reheat steam of reheater (1-2) export of boiler (1) gets into second vapour and salt heat exchanger (15) and first phase change heat exchanger (16) in order and releases heat, and the condensate water is retrieved to oxygen-eliminating device (7), and low temperature fused salt gets into first phase change heat exchanger (16) and second vapour and salt heat exchanger (15) in order against the current after low temperature fused salt boosts from low temperature fused salt jar (10) through low temperature fused salt pump (11), and the high temperature fused salt after the heat absorption flows into high temperature fused salt jar (12) and stores.
6. The heat storage and release method of the thermal storage type deep flexible peak shaving thermal power generation system according to claim 4, wherein the heat release process is divided into two parts: the first part is that the high-temperature molten salt of the high-temperature molten salt tank (12) is boosted by a high-temperature molten salt pump (13) and then flows through a third vapor-salt heat exchanger (17), a second phase change heat exchanger (18) and a water-salt heat exchanger (19) in sequence, and the low-temperature molten salt after releasing heat flows into the low-temperature molten salt tank (10); the feed water from the high-pressure heater group (9) flows through a water-salt heat exchanger (19), a second phase heat exchanger (18) and a third vapor-salt heat exchanger (17) in sequence to absorb heat to generate superheated steam, and the superheated steam is mixed with a superheater (1-1) of a boiler and then is sent to an inlet of a high-pressure cylinder (2-1) of a steam turbine; the second part is that the high-temperature molten salt of high-temperature molten salt jar (12) flows into fourth vapour salt heat exchanger (20) after high-temperature molten salt pump (13) steps up, and the low-temperature molten salt after giving out the heat flows into low-temperature molten salt jar (10).
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| CN114876596B (en) * | 2022-05-18 | 2023-05-23 | 西安热工研究院有限公司 | An operating system and method for heat storage of molten salt steam in a cylinder cutting unit |
| CN114876597B (en) * | 2022-05-19 | 2024-01-23 | 西安热工研究院有限公司 | System and method for realizing island operation of thermal power generating unit by coupling molten salt energy storage |
| CN114776396B (en) * | 2022-05-27 | 2023-05-05 | 华能国际电力股份有限公司 | Quick starting system and operation method for coal-fired power plant |
| CN114992613A (en) * | 2022-05-30 | 2022-09-02 | 中国电力工程顾问集团华东电力设计院有限公司 | Energy storage depth peak regulation system of steam-fused salt coupling |
| CN114909193B (en) | 2022-06-21 | 2024-02-27 | 西安热工研究院有限公司 | Thermal power generating unit flexible operation system based on fused salt heat storage |
| CN115102203B (en) * | 2022-08-29 | 2023-01-17 | 中国能源建设集团山西省电力勘测设计院有限公司 | Energy storage and discharge method of cogeneration unit under deep peak regulation operation |
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