CN114593410B - Thermoelectric decoupling system and method - Google Patents
Thermoelectric decoupling system and method Download PDFInfo
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- CN114593410B CN114593410B CN202210210343.5A CN202210210343A CN114593410B CN 114593410 B CN114593410 B CN 114593410B CN 202210210343 A CN202210210343 A CN 202210210343A CN 114593410 B CN114593410 B CN 114593410B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 70
- 238000010248 power generation Methods 0.000 claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 239000003673 groundwater Substances 0.000 claims abstract description 17
- 238000005338 heat storage Methods 0.000 claims description 16
- 230000005540 biological transmission Effects 0.000 claims description 3
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- 230000008859 change Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
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- 239000000463 material Substances 0.000 description 2
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- 239000013589 supplement Substances 0.000 description 2
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- 238000010795 Steam Flooding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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- 230000003993 interaction Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
- F01K7/02—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 of multiple-expansion type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D15/00—Other domestic- or space-heating systems
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The application discloses a thermoelectric decoupling system and a thermoelectric decoupling method, and relates to the technical field of cogeneration. The specific implementation scheme is as follows: the power generation subsystem and the shell side of the steam-water heat exchanger are connected through a circulating pipeline to form a first loop, and the power generation subsystem and the heat supply subsystem are connected through a circulating pipeline to form a second loop; the outlet of the heating subsystem is connected with the inlet of the cold well; the pipe side outlet of the steam-water heat exchanger is connected with the inlet of the hot well, and the hot well submersible pump is connected between the outlet of the hot well and the inlet of the heat supply subsystem. The application realizes flexible conversion of energy among steam heat energy, groundwater heat energy and heat energy of heat supply network water heat energy, and improves flexibility of the thermoelectric decoupling system.
Description
Technical Field
The application relates to the technical field of cogeneration, in particular to a thermoelectric decoupling system and a thermoelectric decoupling method.
Background
In the related technology, the coal-electricity flexibility transformation is a trend of power production development under the energy transformation background, and mainly relates to the technologies of low-load stable combustion, unit load rate change improvement, thermoelectric decoupling, energy storage peak shaving and the like. In the aspect of the thermoelectric decoupling technology, the cut-cylinder heat supply improves the power output adjusting capability of the unit, but because the unit is directly switched from steam extraction heat supply to cut-cylinder heat supply, the middle part has no transition state, and the electric heating operation domain of the unit is limited.
Disclosure of Invention
To this end, the present application provides a system and method for thermal decoupling.
According to a first aspect of the present application, there is provided a thermocouple system characterized by comprising: the heat storage subsystem comprises a steam-water heat exchanger, a cold well, a hot well submersible pump and a cold well submersible pump, wherein,
the power generation subsystem is connected with the shell side of the steam-water heat exchanger through a circulating pipeline to form a first loop, and the power generation subsystem is connected with the heat supply subsystem through a circulating pipeline to form a second loop;
the cold well submerged pump is connected between the outlet of the cold well and the pipe side inlet of the steam-water heat exchanger, and the outlet of the heat supply subsystem is connected with the inlet of the cold well;
and a pipe side outlet of the steam-water heat exchanger is connected with an inlet of the hot well, and the hot well submersible pump is connected between an outlet of the hot well and an inlet of the heat supply subsystem.
According to one embodiment of the present disclosure, the power generation subsystem includes a heat source, a high pressure cylinder, a medium pressure cylinder, a low pressure cylinder, and a generator, wherein,
the outlet of the heat source is sequentially connected with the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder;
the high-pressure cylinder is sequentially connected with the medium-pressure cylinder, the low-pressure cylinder and the generator through transmission shafts;
a first valve is connected between the outlet of the medium pressure cylinder and the inlet of the low pressure cylinder;
and the outlet of the medium pressure cylinder is connected with the inlet of the heating subsystem.
According to one embodiment of the present disclosure, the power generation subsystem further comprises a condenser, a condensate pump, a deaerator, a low pressure heater bank, a feedwater pump, and a high pressure heater bank, wherein,
the outlet of the low-pressure cylinder is sequentially connected with a condenser, a condensate pump, a low-pressure heater group, a deaerator, a water supply pump, a high-pressure heater group and finally connected to the inlet of the heat source;
and an outlet of the heating subsystem is connected with an inlet of the deaerator.
According to one embodiment of the present disclosure, the heating subsystem includes a primary and a secondary heat network heater, wherein,
the pipe side outlet of the primary heat supply network heater is connected with the pipe side inlet of the secondary heat supply network heater;
the outlet of the medium pressure cylinder is connected with the shell side inlet of the secondary heat supply network heater;
the shell side outlet of the secondary heat supply network heater is connected with the inlet of the deaerator;
the hot well submersible pump is connected between the outlet of the hot well and the shell side inlet of the primary heat supply network heater;
and a shell side outlet of the primary heat supply network heater is connected with an inlet of the cold well.
According to one embodiment of the present disclosure, the heating subsystem further comprises a fifth valve and a sixth valve, wherein,
the fifth valve is connected between the outlet of the medium pressure cylinder and the shell side inlet of the secondary heat supply network heater;
and the sixth valve is connected between the shell side outlet of the secondary heat supply network heater and the inlet of the deaerator.
According to one embodiment of the present disclosure, the outlet of the high pressure cylinder is connected to the inlet of the heat source.
According to one embodiment of the present disclosure, the heat storage subsystem further comprises a third valve and a fourth valve, wherein,
the outlet of the medium pressure cylinder is connected with the fourth valve between the shell side inlet of the steam-water heat exchanger;
and the fifth valve is connected between the shell side outlet of the steam-water heat exchanger and the inlet of the deaerator.
According to one embodiment of the present disclosure, the system further comprises a second valve and a seventh valve, wherein,
the outlet of the power generation subsystem is connected with one side of the second valve;
the other side of the second valve is connected with the inlet of the heat storage subsystem and the inlet of the heat supply subsystem;
one side of the seventh valve is connected with the outlet of the heat storage subsystem and the outlet of the heat supply subsystem;
the other side of the seventh valve is connected with the inlet of the power generation subsystem.
According to a second aspect of the present application there is provided a method for a thermocouple system as described in the first aspect, comprising:
acquiring a current thermal load demand value and a current electrical load demand value;
determining a first preset heat supply amount and a second preset heat supply amount corresponding to the current electric load demand value according to the current electric load demand value;
comparing the pre-heat load demand value with the first preset heat supply amount and the second preset heat supply amount to obtain a comparison result; wherein the first preset heat supply amount is smaller than the second preset heat supply amount;
and adjusting a valve in the thermoelectric decoupling system based on the comparison result so that the current heat supply quantity is equal to the current heat load demand value.
According to one embodiment of the disclosure, the adjusting the valve in the thermoelectric decoupling system based on the comparison result so that the current heat supply amount is equal to the current heat load demand value includes:
responding to the comparison result that the current heat load demand value is smaller than or equal to the first preset heat supply quantity, and adjusting the opening of the first valve based on a preset first opening value; or,
responding to the comparison result that the current heat load demand value is larger than the first preset heat supply quantity and smaller than the second preset heat supply quantity, adjusting the opening of the first valve based on a preset second opening value, opening a third valve and a fourth valve, controlling the cold well submersible pump to pump underground water into the steam-water heat exchanger for heat exchange, and controlling the steam-water heat exchanger to input the underground water subjected to heat exchange into the hot well; or,
responding to the comparison result that the current heat load demand value is equal to the second preset heat supply amount, and adjusting the opening of the first valve based on a preset second opening value; or,
and responding to the comparison result that the current heat load demand value is larger than the second preset heat supply amount, adjusting the opening of the first valve based on the preset second opening value, controlling the hot well submersible pump to pump groundwater into the primary heat supply network heater so as to preheat heat supply network water in the primary heat supply network heater, and controlling the primary heat supply network heater to input groundwater into the cold well.
According to the technical scheme, the redundant heat generated in the power generation subsystem and the groundwater of the aquifer in the heat storage subsystem are subjected to heat exchange, the redundant heat generated in the heat supply process is stored, and when the heat supply is insufficient, the heat stored in the groundwater is used for supplementing the heat supply, so that the flexible conversion of energy among steam heat energy, groundwater heat energy and heat energy of heat supply network water is realized, and the flexibility of the thermoelectric decoupling system is improved.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the application or to delineate the scope of the application. Other features of the present application will become apparent from the description that follows.
Drawings
The drawings are included to provide a better understanding of the present application and are not to be construed as limiting the application. Wherein:
fig. 1 is a schematic diagram of a thermoelectric decoupling system according to a first embodiment of the present application;
fig. 2 is a schematic diagram of a method of a thermoelectric decoupling system according to a second embodiment of the present application.
Reference numerals
1-a boiler; 2-a high-pressure cylinder; 3-a medium pressure cylinder; 4-a low pressure cylinder; a 5-generator; 6-a condenser; 7-a condensate pump; 8-a low pressure heater group; 9-deaerator; 10-a water supply pump; 11-a high-pressure heater group; 12-a steam-water heat exchanger; 13-a thermal well; 14-cooling well; 15-a thermal well submersible pump; 16-a cold well submersible pump; 17-a secondary heat supply network heater; 18-a primary heating network heater; 19-a first valve; 20-a second valve; 21-a third valve; 22-fourth valve; 23-fifth valve; 24-sixth valve; 25-seventh valve.
Detailed Description
Exemplary embodiments of the present application will now be described with reference to the accompanying drawings, in which various details of the embodiments of the present application are included to facilitate understanding, and are to be considered merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the application. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
In the related art, the coal-electricity flexibility transformation is a trend of power production development under the energy transformation background, and mainly relates to the technologies of low-load stable combustion, unit load rate change improvement, thermoelectric decoupling, energy storage peak shaving and the like. In the aspect of the thermoelectric decoupling technology, the cut-cylinder heat supply improves the power output adjusting capability of the unit, but because the unit is directly switched from steam extraction heat supply to cut-cylinder heat supply, the middle part has no transition state, and the electric heating operation domain of the unit is limited.
Based on the above problems, the application provides a thermoelectric decoupling system and a thermoelectric decoupling method, which can realize heat exchange between the redundant heat generated in the power generation subsystem and the groundwater in the water-bearing layer in the heat storage subsystem, store the redundant heat generated in the heat supply process, and supplement the heat supply by utilizing the heat stored in the groundwater when the heat supply is insufficient, thereby realizing flexible conversion of energy among steam heat energy, groundwater heat energy and heat energy of heat supply network water heat energy and improving the flexibility of the thermoelectric decoupling system.
Fig. 1 is a schematic diagram of a thermoelectric decoupling system according to a first embodiment of the present application. As shown in fig. 1, a thermal decoupling system includes a power generation subsystem, a heating subsystem, and a heat storage subsystem.
The power generation subsystem comprises a heat source, a high-pressure cylinder 2, a medium-pressure cylinder 3, a low-pressure cylinder 4, a generator 5, a condenser 6, a condensate pump 7, a low-pressure heater group 8, a deaerator 9, a water supply pump 10 and a high-pressure heater group 11, as shown in fig. 1. The outlet of the heat source is sequentially connected with the high-pressure cylinder 2, the medium-pressure cylinder 3 and the low-pressure cylinder 4, the high-pressure cylinder 2 is sequentially connected with the medium-pressure cylinder 3, the low-pressure cylinder 4 and the generator 5 through a transmission shaft, a first valve 19 is connected between the outlet of the medium-pressure cylinder 3 and the inlet of the low-pressure cylinder 4, the outlet of the medium-pressure cylinder 3 is connected with the inlet of a heat supply subsystem, the outlet of the low-pressure cylinder 4 is sequentially connected with the condenser 6, the condensate pump 7, the low-pressure heater group 8, the deaerator 9, the water supply pump 10, the high-pressure heater group 11 and finally connected with the inlet of the heat source, and the outlet of the heat supply subsystem is connected with the inlet of the deaerator 9.
Alternatively, the heat source may be the boiler 1. The tube side may be a side of the apparatus for transporting a low temperature medium, and the shell side may be a side of the apparatus for transporting a high temperature medium. Wherein the cryogenic medium may be water. The high temperature thermal medium may be steam or water.
It can be understood that the boiler 1 heats water, the generated steam drives the generator 5 to generate electricity after acting through the high-pressure cylinder 2, the medium-pressure cylinder 3 and the low-pressure cylinder 4 in sequence, the low-pressure cylinder 4 inputs the exhaust steam into the condenser 6 to be condensed, and then the exhaust steam sequentially passes through the condensate pump 7, the low-pressure heater group 8, the deaerator 9, the water supply pump 10 and the high-pressure heater group 11, and then returns to the boiler 1 to complete the steam-water circulation of the coal-fired generator set.
As a possible example, the outlet of the high pressure cylinder 2 is connected with the inlet of the heat source, the steam generated by the boiler 1 enters the high pressure cylinder 2 to do work and then returns to the boiler 1 to perform secondary heating, and the steam after the secondary heating enters the medium pressure cylinder 3 to do work.
The heat storage subsystem comprises a steam-water heat exchanger 12, a cold well 14, a hot well 13, a hot well submersible pump 15 and a cold well submersible pump 16, and the power generation subsystem is connected with the shell side of the steam-water heat exchanger 12 through a circulating pipeline to form a first loop. Specifically, steam generated in the power generation subsystem is transmitted to the steam-water heat exchanger 12 via a circulation pipeline, and the steam is heated by the underground water in the steam-water heat exchanger 12 and then returned to the power generation subsystem.
The power generation subsystem and the heat supply subsystem are connected through a circulating pipeline to form a second loop. A cold well submersible pump 16 is connected between the outlet of the cold well 14 and the pipe side inlet of the steam-water heat exchanger 12, the outlet of the heat supply subsystem is connected with the inlet of the cold well 14, the pipe side outlet of the steam-water heat exchanger 12 is connected with the inlet of the hot well 13, and a hot well submersible pump 15 is connected between the outlet of the hot well 13 and the inlet of the heat supply subsystem.
As one possible example, the cold well 14, the hot well 13 are disposed in an aquifer below the surface.
When heat storage is needed, steam enters the steam-water heat exchanger 12 from the medium pressure cylinder 3 of the power generation system, and the cold well submersible pump 16 inputs groundwater in the cold well 14 to the steam-water heat exchanger 12. The underground water enters a heat well 13 after heat exchange with steam in a steam-water heat exchanger 12, and heat storage is completed. The steam returns to the deaerator 9 after heat exchange is completed, so that the steam-water circulation of the power generation system is realized.
A third valve 21 is connected between the outlet of the medium pressure cylinder 3 and the shell side inlet of the steam-water heat exchanger 12; a fourth valve 22 is connected between the shell-side outlet of the steam-water heat exchanger 12 and the inlet of the deaerator 9.
In an embodiment of the application, a third valve 21 may be used to control the steam entering the steam-to-water heat exchanger 12 and a fourth valve 22 may be used to control the steam return to the power generation subsystem.
The heat supply subsystem comprises a primary heat supply network heater 18 and a secondary heat supply network heater 17, wherein a pipe side outlet of the primary heat supply network heater 18 is connected with a pipe side inlet of the secondary heat supply network heater 17, an outlet of the medium pressure cylinder 3 is connected with a shell side inlet of the secondary heat supply network heater 17, a shell side outlet of the secondary heat supply network heater 17 is connected with an inlet of the deaerator 9, a heat well submersible pump 15 is connected between an outlet of the heat well 13 and a shell side inlet of the primary heat supply network heater 18, and a shell side outlet of the primary heat supply network heater 18 is connected with an inlet of the cold well 14.
As a possible example, steam from the intermediate pressure cylinder 3 enters the secondary grid heater 17 to heat the grid water and then returns to the deaerator 9 of the power generation subsystem.
It will be appreciated that the return water from the heat supply network passes through the primary and secondary heat supply network heaters 18 and 17 in sequence and returns to the heat supply network to form a circulation.
As one possible example, the groundwater in the thermal wells may be input to the primary thermal network heater 18 via the thermal well submersible pump 15 to preheat the thermal network water return. The preheated groundwater is input into the cold well 14, the preheated heat supply network water is input into the secondary heat supply network heater 17 for heating, and then the preheated groundwater is used as heat supply network water to enter the heat supply network again.
The heating subsystem further comprises a fifth valve 23 and a sixth valve 24, wherein the fifth valve 23 is connected between the outlet of the medium pressure cylinder 3 and the shell side inlet of the secondary heat supply network heater 17; a sixth valve 24 is connected between the shell side outlet of the secondary heat supply network heater 17 and the inlet of the deaerator 9.
In an embodiment of the present application, a fifth valve 23 may be used to control steam to enter the secondary grid heater 17 and a sixth valve 24 may be used to control the secondary grid heater 17 to output steam.
The outlet of the power generation subsystem is connected with one side of the second valve 20, the other side of the second valve 20 is connected with the inlet of the heat storage subsystem and the inlet of the heat supply subsystem, one side of the seventh valve 25 is connected with the outlet of the heat storage subsystem and the outlet of the heat supply subsystem, and the other side of the seventh valve 25 is connected with the inlet of the power generation subsystem.
In the embodiment of the application, the second valve 20 can be used for controlling steam from the medium pressure cylinder 3 to enter the steam-water heat exchanger 12 and the secondary heat supply network heater 17, and the seventh valve 25 can be used for controlling steam in the steam-water heat exchanger 12 and the secondary heat supply network heater 17 to enter the deaerator 9.
Fig. 2 is a schematic diagram of a method of a thermal decoupling system according to a second embodiment of the present application. In some embodiments of the present application, as shown in fig. 2, the method of the thermal decoupling system includes:
step 101, a current thermal load demand value and a current electrical load demand value are obtained.
Step 102, determining a first preset heat supply amount and a second preset heat supply amount corresponding to the current electric load demand value according to the current electric load demand value.
It should be noted that, the first preset heat supply amount may be the maximum heat supply amount of the power generation subsystem when the power generation subsystem is required to be the current power load to the external power generation load by reducing the opening of the first valve 19 according to the actual requirement when the system is operated in the medium-exhaust steam extraction heat supply mode. The second preset heat supply amount may be the external heat supply amount of the power generation subsystem when the external power generation load of the power generation subsystem is the current power load demand value after the opening of the first valve 19 is further reduced according to the actual demand, so that the system operates in the cylinder cutting heat supply mode.
It should be noted that, the medium-pressure exhaust steam-extraction heat supply mode is that on the medium-pressure and low-pressure communicating pipe, part of medium-pressure cylinder exhaust steam is extracted as heat source, and the maximum heat supply quantity which can be extracted is the first preset heat supply quantity under the condition of meeting the minimum steam inlet flow limit of the low-pressure cylinder. The cylinder cutting heat supply mode is that under the high vacuum operation condition of a low pressure cylinder of a steam turbine, an original steam inlet pipeline of the low pressure cylinder is cut off by adopting a hydraulic butterfly valve capable of being completely sealed, and only a small amount of cooling steam is introduced into a cooling steam pipeline for cooling a low pressure final stage blade under the air blast working condition under the low pressure cylinder low steam operation working condition, and the maximum heat supply quantity which can be extracted is a second preset heat supply quantity.
As one possible example, the current thermal load demand value Q0 and the current electrical load demand value E0 are acquired, and the first preset heat supply amount Q1 and the second preset heat supply amount Q2 are found from the current electrical load demand value E0.
And step 103, comparing the pre-heat load demand value with the first preset heat supply amount and the second preset heat supply amount to obtain a comparison result.
In the embodiment of the present application, the first preset heat supply amount Q1 is smaller than the second preset heat supply amount Q2.
And 104, adjusting a valve in the thermoelectric decoupling system based on the comparison result so that the current heat supply quantity is equal to the current heat load demand value.
In response to the comparison result being q0< = Q1, the opening of the first valve 19 is controlled to be increased from a preset first opening value, so that the current heat supply quantity q=q0, i.e. the heat supply is performed by adopting the steam extraction heat supply mode.
And in response to the comparison result being Q1< Q0< Q2, controlling the opening of the first valve 19 to be reduced to a second preset opening value, namely adopting a cylinder cutting heat supply mode to supply heat, and opening the third valve 21 and the fourth valve 22. The control refrigeration well submersible pump 16 extracts underground water into the steam-water heat exchanger 12 for heat exchange, and controls the steam-water heat exchanger 12 to input the underground water subjected to heat exchange into the hot well 13, so that redundant heat energy is converted into underground water heat energy, and the underground water heat energy is stored in the hot well 13.
It should be noted that the second preset opening value is smaller than the preset first opening value.
In response to q0=q2, the opening degree of the first valve 19 is controlled to be reduced to a preset second opening degree value.
In response to Q0> Q2, the opening of the first valve 19 is controlled to be reduced to a preset second opening value, the hot well submersible pump 15 is controlled to pump groundwater into the primary heating network heater 18 so as to preheat the heating network water in the primary heating network heater 18, and the primary heating network heater 18 is controlled to input the groundwater into the cold well 14. The heat stored in the underground water is supplemented and heated by the aquifer thermal well 13 to supplement the heat supply quantity of the heat supply network, so that the external heat supply quantity Q=Q0 is met.
According to the method for the thermal decoupling system, disclosed by the embodiment of the application, the current thermal load demand value and the current electric load demand value are obtained, the first preset heat supply amount and the second preset heat supply amount corresponding to the current electric load demand value are determined according to the current electric load demand value, the previous thermal load demand value is compared with the first preset heat supply amount and the second preset heat supply amount, the comparison result is obtained, and the valve in the thermal decoupling system is adjusted based on the comparison result, so that the current heat supply amount is equal to the current thermal load demand value.
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (7)
1. A thermal decoupling system, comprising: the heat storage subsystem comprises a steam-water heat exchanger, a cold well, a hot well submersible pump and a cold well submersible pump, wherein,
the power generation subsystem is connected with the shell side of the steam-water heat exchanger through a circulating pipeline to form a first loop, and the power generation subsystem is connected with the heat supply subsystem through a circulating pipeline to form a second loop;
the cold well submerged pump is connected between the outlet of the cold well and the pipe side inlet of the steam-water heat exchanger, and the outlet of the heat supply subsystem is connected with the inlet of the cold well;
the pipe side outlet of the steam-water heat exchanger is connected with the inlet of the hot well, and the hot well submersible pump is connected between the outlet of the hot well and the inlet of the heat supply subsystem;
the power generation subsystem comprises a heat source, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder and a power generator, wherein,
the outlet of the heat source is sequentially connected with the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder through pipelines;
the high-pressure cylinder is sequentially connected with the medium-pressure cylinder, the low-pressure cylinder and the generator through transmission shafts;
a first valve is connected between the outlet of the medium pressure cylinder and the inlet of the low pressure cylinder;
the outlet of the medium pressure cylinder is connected with the inlet of the heating subsystem; the power generation subsystem also comprises a condenser, a condensate pump, a low-pressure heater group, a deaerator, a water supply pump and a high-pressure heater group, wherein,
the outlet of the low-pressure cylinder is sequentially connected with a condenser, a condensate pump, a low-pressure heater group, a deaerator, a water supply pump, a high-pressure heater group and finally connected to the inlet of the heat source;
the outlet of the heating subsystem is connected with the inlet of the deaerator;
the heating subsystem comprises a primary heat supply network heater and a secondary heat supply network heater, wherein,
the pipe side outlet of the primary heat supply network heater is connected with the pipe side inlet of the secondary heat supply network heater;
the outlet of the medium pressure cylinder is connected with the shell side inlet of the secondary heat supply network heater;
the shell side outlet of the secondary heat supply network heater is connected with the inlet of the deaerator;
the hot well submersible pump is connected between the outlet of the hot well and the shell side inlet of the primary heat supply network heater;
and a shell side outlet of the primary heat supply network heater is connected with an inlet of the cold well.
2. The system of claim 1, wherein the heating subsystem further comprises a fifth valve and a sixth valve, wherein,
the fifth valve is connected between the outlet of the medium pressure cylinder and the shell side inlet of the secondary heat supply network heater;
and the sixth valve is connected between the shell side outlet of the secondary heat supply network heater and the inlet of the deaerator.
3. The system of claim 1, wherein the system further comprises a controller configured to control the controller,
the outlet of the high-pressure cylinder is connected with the inlet of the heat source.
4. The system of claim 1, wherein the heat storage subsystem further comprises a third valve and a fourth valve, wherein,
the outlet of the medium pressure cylinder is connected with the shell side inlet of the steam-water heat exchanger;
and the fourth valve is connected between the shell side outlet of the steam-water heat exchanger and the inlet of the deaerator.
5. The system of claim 1, further comprising a second valve and a seventh valve, wherein,
the outlet of the power generation subsystem is connected with one side of the second valve;
the other side of the second valve is connected with the inlet of the heat storage subsystem and the inlet of the heat supply subsystem;
one side of the seventh valve is connected with the outlet of the heat storage subsystem and the outlet of the heat supply subsystem;
the other side of the seventh valve is connected with the inlet of the power generation subsystem.
6. A method for use in a thermal decoupling system as claimed in any one of claims 1 to 5, comprising:
acquiring a current thermal load demand value and a current electrical load demand value;
determining a first preset heat supply amount and a second preset heat supply amount corresponding to the current electric load demand value according to the current electric load demand value;
comparing the pre-heat load demand value with the first preset heat supply amount and the second preset heat supply amount to obtain a comparison result; wherein the first preset heat supply amount is smaller than the second preset heat supply amount;
and adjusting a valve in the thermoelectric decoupling system based on the comparison result so that the current heat supply quantity is equal to the current heat load demand value.
7. The method of claim 6, wherein adjusting a valve in the thermocouple system such that a current heat supply amount is equal to the current heat load demand value based on the comparison result comprises:
responding to the comparison result that the current heat load demand value is smaller than or equal to the first preset heat supply quantity, and adjusting the opening of the first valve based on a preset first opening value; or,
responding to the comparison result that the current heat load demand value is larger than the first preset heat supply quantity and smaller than the second preset heat supply quantity, adjusting the opening of the first valve based on a preset second opening value, opening a third valve and a fourth valve, controlling the cold well submersible pump to pump underground water into the steam-water heat exchanger for heat exchange, and controlling the steam-water heat exchanger to input the underground water subjected to heat exchange into the hot well; or,
responding to the comparison result that the current heat load demand value is equal to the second preset heat supply amount, and adjusting the opening of the first valve based on a preset second opening value; or,
and responding to the comparison result that the current electric load demand value is larger than the second preset heat supply amount, adjusting the opening of the first valve based on the preset second opening value, controlling the hot well submersible pump to pump groundwater into the primary heat supply network heater so as to preheat heat supply network water in the primary heat supply network heater, and controlling the primary heat supply network heater to input groundwater into the cold well.
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