CN110863870B - Inclined temperature layer heat storage peak regulation system and peak regulation method based on high-pressure heating loop - Google Patents
Inclined temperature layer heat storage peak regulation system and peak regulation method based on high-pressure heating loop Download PDFInfo
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- CN110863870B CN110863870B CN201911088051.3A CN201911088051A CN110863870B CN 110863870 B CN110863870 B CN 110863870B CN 201911088051 A CN201911088051 A CN 201911088051A CN 110863870 B CN110863870 B CN 110863870B
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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
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
- F28D2020/0047—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material using molten salts or liquid metals
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Abstract
The invention discloses a thermocline heat storage peak regulation system and a peak regulation method based on a high-pressure heating loop, wherein the peak regulation system comprises a heat storage module and a peak regulation module, the peak regulation module comprises a main path throttle valve, a bypass throttle valve, a first molten salt pump, a second molten salt pump, a first molten salt valve, a second molten salt valve, a first steam valve and a second steam valve, and the peak regulation method is characterized in that the work state of a steam turbine is changed through the peak regulation module according to an input peak regulation target, so that dynamic peak regulation is realized; the invention can improve the load lifting speed of the thermal power generating unit, improve the flexibility and the economy of the unit, and has simple structure and convenient operation.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a sloping temperature layer heat storage peak regulation system and a peak regulation method based on a high-pressure heating loop.
Background
At present, with the rapid development of economy in China and the increasing improvement of the living standard of people, the power utilization requirement is also continuously improved. The capacity of a coal burner assembling machine in an electric power system is large, and in order to match with new energy power generation grid connection of large-scale wind power, solar energy and the like and change of electricity utilization structures in China, a coal-fired unit can bear more and more difficult peak regulation tasks. This puts higher demands on the flexibility of the coal-fired unit, requires that it can operate with a large amplitude of variable load and has a fast variable load rate. When the power grid requires rapid load change, the heat storage capacity in the system is limited, and a more potential heat storage system is required to be matched with the traditional coal-fired unit. The main limiting factors of the flexibility of the thermal power generating unit in China are insufficient peak regulation capacity, slow load response speed and obvious influence on the safety, environmental protection and economy of the unit. The technology adopted for improving the flexibility of the unit at home and abroad mainly comprises the following steps: the method comprises a minimum stable combustion technology, a heat storage tank thermoelectric decoupling peak regulation technology, an electric boiler thermoelectric decoupling peak regulation technology, a turbine bypass heat supply peak regulation technology, an energy storage peak regulation technology, a coordination optimization control technology and the like.
Disclosure of Invention
The invention aims to provide a thermocline heat storage peak regulation system and a peak regulation method based on a high-pressure heating loop, which can improve the load lifting speed of a thermal power generating unit, improve the flexibility and the economy of the unit, and have the advantages of simple structure and convenience in operation.
The technical scheme adopted by the invention is as follows:
a thermocline heat storage and peak regulation system based on a high-pressure heating loop comprises a boiler, a steam turbine, a condenser and a heat regeneration system, wherein steam in the boiler enters the steam turbine through a steam pipeline to do work, the boiler, the steam turbine, the condenser and the heat regeneration system are sequentially connected to form a loop, and the thermocline heat storage and peak regulation system further comprises a heat storage module and a peak regulation module;
the steam turbine comprises a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder, a new steam outlet of the boiler is connected with an inlet of the high-pressure cylinder, exhaust steam of the high-pressure cylinder enters the boiler to be reheated, a reheated steam outlet of the boiler is connected with an inlet of the intermediate-pressure cylinder, a steam exhaust port of the intermediate-pressure cylinder is connected with an inlet of the low-pressure cylinder, and a steam exhaust port of the low-pressure cylinder is connected with a condenser;
the heat recovery system comprises a low-pressure heat exchanger, a deaerator and a high-pressure heat exchanger which are sequentially connected through a main pipeline, wherein the inlet of the low-pressure heat exchanger is connected with a condenser, and the outlet of the high-pressure heat exchanger is connected with the inlet of a boiler; the heat exchange port of the low-pressure heat exchanger is connected with the steam extraction port of the low-pressure cylinder, the inlet of the deaerator is connected with the steam exhaust port of the medium-pressure cylinder, and the heat exchange port of the high-pressure heat exchanger is respectively connected with the steam extraction port of the medium-pressure cylinder and the steam extraction port of the high-pressure cylinder;
the heat storage system comprises a water-molten salt heat exchanger, a molten salt tank, a steam-molten salt heat exchanger and a heat pump, wherein the molten salt tank is a single tank; the water-side inlet of the water-molten salt heat exchanger is connected with the outlet of the deaerator, the water-side outlet of the water-molten salt heat exchanger is connected with the inlet of the boiler through a steam drum, the molten salt-side inlet of the water-molten salt heat exchanger is connected with the top of the molten salt tank, and the molten salt-side outlet of the water-molten salt heat exchanger is connected with the bottom of the molten salt tank; a fused salt side outlet of the steam-fused salt heat exchanger is connected with the top of the fused salt tank, a fused salt side inlet of the steam-fused salt heat exchanger is connected with the bottom of the fused salt tank, a steam side outlet of the steam-fused salt heat exchanger is connected with an inlet of the boiler through a steam drum, and a steam side inlet of the steam-fused salt heat exchanger is connected with an outlet of the heat pump; the primary inlet of the heat pump is connected with a new steam outlet of the boiler through a new steam bypass pipeline, and the secondary inlet of the heat pump is connected with a reheat steam outlet of the boiler through a reheat steam bypass pipeline;
the peak regulation module comprises a main path throttle valve, a bypass throttle valve, a first molten salt pump, a second molten salt pump, a first molten salt valve, a second molten salt valve, a first steam valve and a second steam valve; the main path throttle valve is arranged on an outlet water supply pipeline of the deaerator, the bypass throttle valve is arranged on a water side inlet of the water-molten salt heat exchanger, the first molten salt pump and the first molten salt valve are sequentially arranged on a molten salt side inlet of the water-molten salt heat exchanger, the second molten salt pump and the second molten salt valve are sequentially arranged on a molten salt side inlet of the steam-molten salt heat exchanger, the first steam valve is arranged between a primary inlet of the heat pump and a new steam outlet of the boiler, and the second steam valve is arranged between a secondary inlet of the heat pump and a reheated steam outlet of the boiler.
Further, the heat pump is an ejector heat pump.
A peak regulation method adopting the thermocline heat storage peak regulation system based on the high-pressure heating loop comprises the following steps:
A. inputting a set peak regulation target in a control center; the peak regulation target comprises a peak regulation type and a load regulation target value;
B. according to the peak regulation target, the work doing state of the steam turbine is changed through a peak regulation module, and then dynamic peak regulation is achieved; the peak regulation type comprises a rapid load increasing and a rapid load decreasing;
(a) the peak regulation process of the rapid load increase specifically comprises the following steps:
a 1: opening a first molten salt valve and a bypass throttle valve, enabling a first molten salt pump to work, and enabling a second molten salt pump to not work;
a 2: closing the first steam valve, the second steam valve and the second molten salt valve;
a 3: the opening degree of a main path throttle valve is reduced according to the load adjustment target value, the main water supply quantity at the outlet of the deaerator is reduced, the steam extraction quantity of a high-pressure cylinder and a medium-pressure cylinder of the steam turbine is reduced, more steam of the low-pressure cylinder applies work and returns to the condenser, and the work of the steam turbine is increased;
a 4: part of the deaerator outlet feed water enters the water-molten salt heat exchanger through the bypass throttle valve to be heated, and the heated water enters the steam drum;
a 5: the hot molten salt on the top of the molten salt tank is driven by a first molten salt pump to release heat through a water-molten salt heat exchanger and then becomes cold molten salt to return to the bottom of the molten salt tank;
(b) the peak regulation process of the rapid load reduction specifically comprises the following steps:
b 1: opening a first steam valve, a second molten salt valve and a main path throttle valve, wherein the opening degrees of the first steam valve and the second steam valve are adjusted according to a load adjustment target value;
b 2: closing the first molten salt valve and the bypass throttle valve, wherein the first molten salt pump does not work, and the second molten salt pump works;
b 3: the new steam and the reheated steam of the boiler enter a steam-molten salt heat exchanger through a heat pump to release heat, and the steam after heat release enters a steam drum;
b 4: the cold molten salt at the bottom of the molten salt tank is heated by the steam-molten salt heat exchanger under the drive of the second molten salt pump and then returns to the top of the molten salt tank to be used as hot molten salt heat storage; because part of the live steam and the reheated steam heat the molten salt for heat storage, the work of the steam turbine is reduced.
The invention has the following beneficial effects:
(1) the peak regulation module is adopted to carry out structural adjustment on the heat storage systems under different working conditions, and the heat storage characteristics of an inclined temperature layer in the molten salt tank are utilized, namely the upper layer is hot molten salt and the lower layer is cold molten salt, so that the dynamic conversion of heat during load lifting is realized, the load lifting speed of the thermal power generating unit is improved, the flexibility and the economy of the unit are improved, and meanwhile, the peak regulation module has the advantages of simple structure and cost saving;
(2) by adopting the jet heat pump and designing the inlet steam of the jet heat pump to be the new steam and the reheated steam of the boiler, the temperature can be flexibly adjusted to reach the heating temperature required by the molten salt, and the flexibility of the invention is further improved;
(3) the peak regulation targets of fast load increasing and fast load decreasing are realized by adjusting different structures in the peak regulation module according to the load adjustment requirement, the peak regulation efficiency is high, the flexibility is strong, the energy generated by the system is fully utilized, and the economy of the peak regulation system is improved.
Drawings
Fig. 1 is a schematic structural diagram of the peak shaving system of the present invention.
Description of reference numerals:
1. a heat pump; 1-1, primary inlet; 1-2, a secondary inlet; 2. a molten salt tank; 3. a steam-molten salt heat exchanger; 3-1, a steam side inlet of the steam-molten salt heat exchanger; 3-2, a steam side outlet of the steam-molten salt heat exchanger; 3-3, a fused salt side outlet of the steam-fused salt heat exchanger; 3-4, a molten salt side inlet of the steam-molten salt heat exchanger; 4. a water-molten salt heat exchanger; 4-1, a molten salt side inlet of the water-molten salt heat exchanger; 4-2, a molten salt side outlet of the water-molten salt heat exchanger; 4-3, water side outlet of the water-molten salt heat exchanger; 4-4, a water-side inlet of the water-molten salt heat exchanger; 5. a first molten salt pump; 6. a second molten salt pump; 7. a second steam valve; 8. a first steam valve; 9. a first molten salt valve; 10. a second molten salt valve; 11. a bypass throttle valve; 12. a condenser; 13. a steam drum; 14. a boiler; 15. a high pressure cylinder; 16. an intermediate pressure cylinder; 17. a low pressure cylinder; 18. a deaerator; 19. the main road throttle valve.
Detailed Description
As shown in fig. 1, the present invention includes a peak shaving system and a peak shaving method for thermocline heat storage based on a high-pressure heating loop.
The peak regulation system comprises a boiler 14, a steam turbine, a condenser 12 and a regenerative system, wherein steam in the boiler 14 enters the steam turbine through a steam pipeline to do work, the boiler 14, the steam turbine, the condenser 12 and the regenerative system are sequentially connected to form a loop, and the peak regulation system also comprises a heat storage module and a peak regulation module;
the steam turbine comprises a high-pressure cylinder 15, an intermediate-pressure cylinder 16 and a low-pressure cylinder 17, a new steam outlet of a boiler 14 is connected with an inlet of the high-pressure cylinder 15, exhaust steam of the high-pressure cylinder 15 enters the boiler 14 for reheating, a reheated steam outlet of the boiler 14 is connected with an inlet of the intermediate-pressure cylinder 16, a steam outlet of the intermediate-pressure cylinder 16 is connected with an inlet of the low-pressure cylinder 17, and a steam outlet of the low-pressure cylinder 17 is connected with a condenser 12;
the heat recovery system comprises a low-pressure heat exchanger, a deaerator 18 and a high-pressure heat exchanger which are sequentially connected through a main pipeline, wherein the inlet of the low-pressure heat exchanger is connected with a condenser 12, and the outlet of the high-pressure heat exchanger is connected with the inlet of a boiler 14; the heat exchange port of the low-pressure heat exchanger is connected with the steam extraction port of a low-pressure cylinder 17, the inlet of a deaerator 18 is connected with the steam exhaust port of a medium-pressure cylinder 16, and the heat exchange port of the high-pressure heat exchanger is respectively connected with the steam extraction port of the medium-pressure cylinder 16 and the steam extraction port of a high-pressure cylinder 15;
the heat storage system comprises a water-molten salt heat exchanger 4, a molten salt tank 2, a steam-molten salt heat exchanger 3 and a heat pump 1, wherein the molten salt tank 2 is a single tank; a water side inlet 4-4 of the water-molten salt heat exchanger is connected with an outlet of a deaerator 18, a water side outlet 4-3 of the water-molten salt heat exchanger is connected with an inlet of a boiler 14 through a steam drum 13, a molten salt side inlet 4-1 of the water-molten salt heat exchanger is connected with the top of a molten salt tank 2, and a molten salt side outlet 4-2 of the water-molten salt heat exchanger is connected with the bottom of the molten salt tank 2; a fused salt side outlet 3-3 of the steam-fused salt heat exchanger is connected with the top of the fused salt tank 2, a fused salt side inlet 3-4 of the steam-fused salt heat exchanger is connected with the bottom of the fused salt tank 2, a steam side outlet 3-2 of the steam-fused salt heat exchanger is connected with an inlet of a boiler 14 through a steam drum 13, and a steam side inlet 3-1 of the steam-fused salt heat exchanger is connected with an outlet of a heat pump 1; a primary inlet 1-1 of the heat pump 1 is connected with a fresh steam outlet of the boiler 14 through a fresh steam bypass pipeline, and a secondary inlet 1-2 of the heat pump 1 is connected with a reheat steam outlet of the boiler 14 through a reheat steam bypass pipeline;
the peak regulation module comprises a main path throttle valve 19, a bypass throttle valve 11, a first molten salt pump 5, a second molten salt pump 6, a first molten salt valve 9, a second molten salt valve 10, a first steam valve 8 and a second steam valve 7; the main path throttle valve 19 is arranged on a water supply pipeline at the outlet of the deaerator 18, the bypass throttle valve 11 is arranged on a water side inlet of the water-molten salt heat exchanger 4, the first molten salt pump 5 and the first molten salt valve 9 are sequentially arranged at a molten salt side inlet 4-1 of the water-molten salt heat exchanger, the second molten salt pump 6 and the second molten salt valve 10 are sequentially arranged at a molten salt side inlet 3-4 of the steam-molten salt heat exchanger, the first steam valve 8 is arranged between a primary inlet 1-1 of the heat pump 1 and a new steam outlet of the boiler 14, and the second steam valve 7 is arranged between a secondary inlet 1-2 of the heat pump 1 and a reheated steam outlet of the boiler 14.
The peak regulation method comprises the following steps:
A. inputting a set peak regulation target in a control center; the peak regulation target comprises a peak regulation type and a load regulation target value;
B. according to the peak regulation target, the work doing state of the steam turbine is changed through a peak regulation module, and then dynamic peak regulation is achieved; the peak regulation type comprises a rapid load increasing and a rapid load decreasing;
(a) the peak regulation process of the rapid load increase specifically comprises the following steps:
a 1: opening a first molten salt valve 9 and a bypass throttle valve 11, enabling a first molten salt pump 5 to work, and enabling a second molten salt pump 6 to not work;
a 2: closing the first steam valve 8, the second steam valve 7 and the second molten salt valve 10;
a 3: the opening degree of a main path throttle valve 19 is reduced according to the load adjustment target value, the main water supply quantity at the outlet of a deaerator 18 is reduced, the steam extraction quantity of a high pressure cylinder 15 and a medium pressure cylinder 16 of the steam turbine is reduced, more steam of a low pressure cylinder 17 does work and returns to a condenser 12, and the work of the steam turbine is increased;
a 4: part of the deaerator outlet feed water enters the water-molten salt heat exchanger 4 through the bypass throttle valve 11 to be heated, and the heated water enters the steam drum 13;
a 5: the hot molten salt at the top of the molten salt tank 2 is driven by a first molten salt pump 5 to release heat through a water-molten salt heat exchanger 4 and then becomes cold molten salt to return to the bottom of the molten salt tank 2;
(b) the peak regulation process of the rapid load reduction specifically comprises the following steps:
b 1: opening the first steam valve 8, the second steam valve 7, the second molten salt valve 10 and the main path throttle valve 19, wherein the opening degrees of the first steam valve 8 and the second steam valve 7 are adjusted according to the load adjustment target value;
b 2: closing the first molten salt valve 9 and the bypass throttle valve 11, enabling the first molten salt pump 5 to be out of work, and enabling the second molten salt pump 6 to be in work;
b 3: the new steam and the reheated steam of the boiler 14 enter the steam-molten salt heat exchanger 3 through the heat pump 1 for heat release, and the steam after the heat release enters the steam drum 13;
b 4: the cold molten salt at the bottom of the molten salt tank 2 is heated by the steam-molten salt heat exchanger 3 under the drive of the second molten salt pump 6 and then returns to the top of the molten salt tank 2 to be used as hot molten salt heat storage; because part of the live steam and the reheated steam heat the molten salt for heat storage, the work of the steam turbine is reduced.
For a better understanding of the present invention, the technical solutions of the present invention are further described below with reference to the accompanying drawings.
As shown in figure 1, the invention discloses a sloped temperature layer heat storage peak regulation system based on a high-pressure heating loop, which comprises a boiler 14, a steam turbine, a condenser 12, a heat return system, a heat storage module and a peak regulation module, wherein steam in the boiler 14 enters the steam turbine through a steam pipeline to do work, and the boiler 14, the steam turbine, the condenser 12 and the heat return system are sequentially connected to form a loop.
The steam turbine includes high pressure cylinder 15, intermediate pressure cylinder 16 and low pressure cylinder 17, and 14 new steam outlet connections high pressure cylinder 15 entrys of boiler, and high pressure cylinder 15 steam exhausts and gets into 14 reheats of boiler, and 14 reheat steam outlet connections intermediate pressure cylinder 16 entrys, and the 16 steam vents of intermediate pressure cylinder connect the 17 entries of low pressure cylinder, and low pressure cylinder 17 steam vents connects condenser 12.
The heat recovery system comprises a low-pressure heat exchanger, a deaerator 18 and a high-pressure heat exchanger which are sequentially connected through a main pipeline, a circulating pump for driving circulation is arranged in the main pipeline, the inlet of the low-pressure heat exchanger is connected with a condenser 12 through a connecting pipe, a low-pressure water feed pump is arranged between the low-pressure heat exchanger and the condenser 12, and the outlet of the high-pressure heat exchanger is connected with the inlet of a boiler 14; the heat exchange ports of the low-pressure heat exchanger are connected with the steam extraction port of a low-pressure cylinder 17, the inlet of a deaerator 18 is connected with the steam exhaust port of a medium-pressure cylinder, a plurality of heat exchange ports of the high-pressure heat exchanger are connected with the steam extraction port of the medium-pressure cylinder 16, and the rest heat exchange ports of the high-pressure heat exchanger are connected with the steam extraction port of a high-pressure cylinder 15.
The heat storage system comprises a water-molten salt heat exchanger 4, a molten salt tank 2, a steam-molten salt heat exchanger 3 and a heat pump 1, wherein the molten salt tank 2 is a single tank; a water side inlet 4-4 of the water-molten salt heat exchanger is connected with an outlet of a deaerator 18, a water side outlet 4-3 of the water-molten salt heat exchanger is connected with an inlet of a boiler 14 through a steam drum 13, a molten salt side inlet 4-1 of the water-molten salt heat exchanger is connected with the top of a molten salt tank 2, and a molten salt side outlet 4-2 of the water-molten salt heat exchanger is connected with the bottom of the molten salt tank 2; a fused salt side outlet 3-3 of the steam-fused salt heat exchanger is connected with the top of the fused salt tank 2, a fused salt side inlet 3-4 of the steam-fused salt heat exchanger is connected with the bottom of the fused salt tank 2, a steam side outlet 3-2 of the steam-fused salt heat exchanger is connected with an inlet of a boiler 14 through a steam drum 13, and a steam side inlet 3-1 of the steam-fused salt heat exchanger is connected with an outlet of a heat pump 1; a primary inlet 1-1 of the heat pump 1 is connected with a fresh steam outlet of the boiler 14 through a fresh steam bypass pipeline, and a secondary inlet 1-2 of the heat pump 1 is connected with a reheat steam outlet of the boiler 14 through a reheat steam bypass pipeline.
The medium in the molten salt tank 2 is molten salt, high-temperature and low-temperature distribution is formed by utilizing an inclined temperature layer, the top and the bottom of the molten salt tank are respectively connected with two molten salt heat exchangers, a heat exchange loop is formed by the molten salt tank and the water-molten salt heat exchanger 4 when heat is released, and a heat exchange loop is formed by the molten salt tank and the steam-molten salt heat exchanger 3 when heat is stored.
The heat pump 1 adopts the injection type heat pump 1, and it is pointed out that the steam entering from the primary inlet 1-1 of the injection type heat pump 1 is new steam, and the steam entering from the secondary inlet 1-2 is reheat steam, so that the steam quality can be flexibly controlled to reach the temperature required by molten salt, and in order to reach the temperature required by heating the molten salt, the opening degrees of the first steam valve 8 and the second steam valve 7 can be adjusted under different conditions to adjust the temperature of the steam side in the steam-molten salt heat exchanger 3, and the specific adjusting process is a mature technical means in the field and is not described herein again.
The peak regulation module comprises a main path throttle valve 19, a bypass throttle valve 11, a first molten salt pump 5, a second molten salt pump 6, a first molten salt valve 9, a second molten salt valve 10, a first steam valve 8 and a second steam valve 7; main way choke valve 19 is located oxygen-eliminating device 18 export water supply line, be equipped with the high pressure water feed pump between main way choke valve 19 and the oxygen-eliminating device 18, bypass choke valve 11 is located the water side entry of water-fused salt heat exchanger 4, the fused salt side entry of water-fused salt heat exchanger 4 is located in proper order to first fused salt pump 5 and first fused salt valve 9, the fused salt side entry of steam-fused salt heat exchanger 3 is located in proper order to second fused salt pump 6 and second fused salt valve 10, first steam valve 8 is located between 1 first entry 1-1 of heat pump and the 14 new steam exports of boiler, second steam valve 7 is located between 1 secondary inlet 1-2 of heat pump and the 14 reheat steam exports of boiler.
The invention also discloses a thermocline heat storage peak regulation method based on the high-pressure heating loop, which comprises the following steps of:
A. inputting a set peak regulation target in a control center; the peak regulation target comprises a peak regulation type and a load regulation target value;
B. according to the peak regulation target, the work doing state of the steam turbine is changed through a peak regulation module, and then dynamic peak regulation is achieved; the peak regulation type comprises a rapid load increasing and a rapid load decreasing;
(a) the peak regulation process of the rapid load increase specifically comprises the following steps:
a 1: opening a first molten salt valve 9 and a bypass throttle valve 11, enabling a first molten salt pump 5 to work, and enabling a second molten salt pump 6 to not work;
a 2: closing the first steam valve 8, the second steam valve 7 and the second molten salt valve 10;
a 3: the opening degree of a main path throttle valve 19 is reduced according to the load adjustment target value, the main water supply quantity at the outlet of a deaerator 18 is reduced, the steam extraction quantity of a high pressure cylinder 15 and a medium pressure cylinder 16 of the steam turbine is reduced, more steam of a low pressure cylinder 17 does work and returns to a condenser 12, and the work of the steam turbine is increased;
a 4: part of the feed water at the outlet of the deaerator 18 enters the water-molten salt heat exchanger 4 through the bypass throttle valve 11 to be heated, and the heated water enters the steam drum 13;
a 5: the hot molten salt at the top of the molten salt tank 2 is driven by a first molten salt pump 5 to release heat through a water-molten salt heat exchanger 4 and then becomes cold molten salt to return to the bottom of the molten salt tank 2.
When the load is quickly increased, part of the high-pressure loop feed water is heated by hot molten salt, steam extraction of the high-pressure cylinder 15 and the medium-pressure cylinder 16 is reduced, the work of the steam turbine is increased, namely the work of the steam turbine is increased by reducing the high-pressure feed water quantity, the hot molten salt is used for providing heat for the high-pressure bypass feed water loop, and the flexibility of the unit during load increase is improved.
(b) The peak regulation process of the rapid load reduction specifically comprises the following steps:
b 1: opening the first steam valve 8, the second steam valve 7, the second molten salt valve 10 and the main path throttle valve 19, wherein the opening degrees of the first steam valve 8 and the second steam valve 7 are adjusted according to the load adjustment target value;
b 2: closing the first molten salt valve 9 and the bypass throttle valve 11, enabling the first molten salt pump 5 to be out of work, and enabling the second molten salt pump 6 to be in work;
b 3: the new steam and the reheated steam of the boiler 14 enter the steam-molten salt heat exchanger 3 through the heat pump 1 for heat release, and the steam after the heat release enters the steam drum 13;
b 4: the cold molten salt at the bottom of the molten salt tank 2 is heated by the steam-molten salt heat exchanger 3 under the drive of the second molten salt pump 6 and then returns to the top of the molten salt tank 2 to be used as hot molten salt heat storage; because part of the live steam and the reheated steam heat the molten salt for heat storage, the work of the steam turbine is reduced.
When the load is quickly reduced, part of live steam and reheated steam heat the molten salt for heat storage, the work amount of the live steam and the reheated steam entering the steam turbine is correspondingly reduced, and the work amount of the steam turbine is reduced.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes, modifications and substitutions can be made therein without departing from the spirit and scope of the embodiments of the present invention.
Claims (2)
1. The utility model provides a thermocline heat-storage peak regulation system based on high pressure heating return circuit, includes boiler, steam turbine, condenser and backheat system, and steam gets into the steam turbine through steam conduit and does work in the boiler, and boiler, steam turbine, condenser and backheat system connect gradually and constitute return circuit, its characterized in that: the device also comprises a heat storage module and a peak regulation module;
the steam turbine comprises a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder, a new steam outlet of the boiler is connected with an inlet of the high-pressure cylinder, exhaust steam of the high-pressure cylinder enters the boiler to be reheated, a reheated steam outlet of the boiler is connected with an inlet of the intermediate-pressure cylinder, a steam exhaust port of the intermediate-pressure cylinder is connected with an inlet of the low-pressure cylinder, and a steam exhaust port of the low-pressure cylinder is connected with a condenser;
the heat recovery system comprises a low-pressure heat exchanger, a deaerator and a high-pressure heat exchanger which are sequentially connected through a main pipeline, wherein the inlet of the low-pressure heat exchanger is connected with a condenser, and the outlet of the high-pressure heat exchanger is connected with the inlet of a boiler; the heat exchange port of the low-pressure heat exchanger is connected with the steam extraction port of the low-pressure cylinder, the inlet of the deaerator is connected with the steam exhaust port of the medium-pressure cylinder, and the heat exchange port of the high-pressure heat exchanger is respectively connected with the steam extraction port of the medium-pressure cylinder and the steam extraction port of the high-pressure cylinder;
the heat storage module comprises a water-molten salt heat exchanger, a molten salt tank, a steam-molten salt heat exchanger and a heat pump, wherein the molten salt tank is a single tank; the water-side inlet of the water-molten salt heat exchanger is connected with the outlet of the deaerator, the water-side outlet of the water-molten salt heat exchanger is connected with the inlet of the boiler through a steam drum, the molten salt-side inlet of the water-molten salt heat exchanger is connected with the top of the molten salt tank, and the molten salt-side outlet of the water-molten salt heat exchanger is connected with the bottom of the molten salt tank; a fused salt side outlet of the steam-fused salt heat exchanger is connected with the top of the fused salt tank, a fused salt side inlet of the steam-fused salt heat exchanger is connected with the bottom of the fused salt tank, a steam side outlet of the steam-fused salt heat exchanger is connected with an inlet of the boiler through a steam drum, and a steam side inlet of the steam-fused salt heat exchanger is connected with an outlet of the heat pump; the primary inlet of the heat pump is connected with a new steam outlet of the boiler through a new steam bypass pipeline, and the secondary inlet of the heat pump is connected with a reheat steam outlet of the boiler through a reheat steam bypass pipeline;
the peak regulation module comprises a main path throttle valve, a bypass throttle valve, a first molten salt pump, a second molten salt pump, a first molten salt valve, a second molten salt valve, a first steam valve and a second steam valve; the main path throttle valve is arranged on a water supply pipeline at the outlet of the deaerator, the bypass throttle valve is arranged on a water side inlet of the water-molten salt heat exchanger, the first molten salt pump and the first molten salt valve are sequentially arranged on a molten salt side inlet of the water-molten salt heat exchanger, the second molten salt pump and the second molten salt valve are sequentially arranged on a molten salt side inlet of the steam-molten salt heat exchanger, the first steam valve is arranged between a primary inlet of the heat pump and a new steam outlet of the boiler, and the second steam valve is arranged between a secondary inlet of the heat pump and a reheated steam outlet of the boiler; the heat pump is an injection type heat pump.
2. A peak shaving method using the thermocline heat storage peak shaving system based on the high-pressure heating loop as claimed in claim 1, characterized in that: the method comprises the following steps:
A. inputting a set peak regulation target in a control center; the peak regulation target comprises a peak regulation type and a load regulation target value;
B. according to the peak regulation target, the work doing state of the steam turbine is changed through a peak regulation module, and then dynamic peak regulation is achieved; the peak regulation type comprises a rapid load increasing and a rapid load decreasing;
(a) the peak regulation process of the rapid load increase specifically comprises the following steps:
a 1: opening a first molten salt valve and a bypass throttle valve, enabling a first molten salt pump to work, and enabling a second molten salt pump to not work;
a 2: closing the first steam valve, the second steam valve and the second molten salt valve;
a 3: the opening degree of a main path throttle valve is reduced according to the load adjustment target value, the main water supply quantity at the outlet of the deaerator is reduced, the steam extraction quantity of a high-pressure cylinder and a medium-pressure cylinder of the steam turbine is reduced, more steam of the low-pressure cylinder applies work and returns to the condenser, and the work of the steam turbine is increased;
a 4: part of the deaerator outlet feed water enters the water-molten salt heat exchanger through the bypass throttle valve to be heated, and the heated water enters the steam drum;
a 5: the hot molten salt on the top of the molten salt tank is driven by a first molten salt pump to release heat through a water-molten salt heat exchanger and then becomes cold molten salt to return to the bottom of the molten salt tank;
(b) the peak regulation process of the rapid load reduction specifically comprises the following steps:
b 1: opening a first steam valve, a second molten salt valve and a main path throttle valve, wherein the opening degrees of the first steam valve and the second steam valve are adjusted according to a load adjustment target value;
b 2: closing the first molten salt valve and the bypass throttle valve, wherein the first molten salt pump does not work, and the second molten salt pump works;
b 3: the new steam and the reheated steam of the boiler enter a steam-molten salt heat exchanger through a heat pump to release heat, and the steam after heat release enters a steam drum;
b 4: the cold molten salt at the bottom of the molten salt tank is heated by the steam-molten salt heat exchanger under the drive of the second molten salt pump and then returns to the top of the molten salt tank to be used as hot molten salt heat storage; because part of the live steam and the reheated steam heat the molten salt for heat storage, the work of the steam turbine is reduced.
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| CN113623034B (en) * | 2021-08-17 | 2022-10-28 | 西安交通大学 | Thermoelectric decoupling system with two-stage steam ejector and operation method |
| CN114704815B (en) * | 2022-04-08 | 2023-11-07 | 西安热工研究院有限公司 | Steam heat storage system |
| CN116398865B (en) * | 2023-04-04 | 2024-08-02 | 北京怀柔实验室 | Efficient and flexible peak shaving molten salt system |
| CN116164271B (en) * | 2023-04-04 | 2024-08-02 | 华北电力大学 | Quick peak-adjusting coal-fired power generation system and operation method |
| CN116718059B (en) * | 2023-08-07 | 2023-10-27 | 山西中能天胜科技有限公司 | Power station peak shaving system and method based on high-capacity high-temperature molten salt energy storage |
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