CN112129005A - Combined cycle power plant multi-energy complementary energy station - Google Patents
Combined cycle power plant multi-energy complementary energy station Download PDFInfo
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- CN112129005A CN112129005A CN202011119693.8A CN202011119693A CN112129005A CN 112129005 A CN112129005 A CN 112129005A CN 202011119693 A CN202011119693 A CN 202011119693A CN 112129005 A CN112129005 A CN 112129005A
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- 230000000295 complement effect Effects 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 323
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 204
- 238000005057 refrigeration Methods 0.000 claims abstract description 116
- 239000003345 natural gas Substances 0.000 claims abstract description 102
- 239000002918 waste heat Substances 0.000 claims abstract description 95
- 238000001816 cooling Methods 0.000 claims abstract description 86
- 238000003860 storage Methods 0.000 claims abstract description 57
- 238000009825 accumulation Methods 0.000 claims abstract description 53
- 238000010248 power generation Methods 0.000 claims abstract description 51
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000003546 flue gas Substances 0.000 claims abstract description 34
- 230000001105 regulatory effect Effects 0.000 claims abstract description 21
- 239000007789 gas Substances 0.000 claims abstract description 14
- 230000005611 electricity Effects 0.000 claims abstract description 10
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims description 58
- 238000005086 pumping Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims 1
- 239000000446 fuel Substances 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 238000003786 synthesis reaction Methods 0.000 abstract description 2
- 239000013589 supplement Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
- F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
- F25B15/06—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being water vapour evaporated from a salt solution, e.g. lithium bromide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B27/00—Machines, plants or systems, using particular sources of energy
- F25B27/02—Machines, plants or systems, using particular sources of energy using waste heat, e.g. from internal-combustion engines
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
- Y02B30/625—Absorption based systems combined with heat or power generation [CHP], e.g. trigeneration
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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
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
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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
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
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- Combustion & Propulsion (AREA)
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- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a combined cycle power plant multi-energy complementary energy station which comprises a natural gas pressure regulating module, a natural gas power generation and refrigeration system, a gas turbine, a waste heat boiler flue gas waste heat refrigeration system, a waste heat boiler steam refrigeration system, a water cold accumulation system and a cold supply pipeline system. The invention provides a multi-energy complementary energy station of a combined cycle power plant, which is suitable for the combined cycle power plant using pipe network natural gas as fuel. But this energy station make full use of power plant's pipe network natural gas's pressure energy generates electricity and refrigerates, also utilizes exhaust-heat boiler flue gas waste heat to refrigerate simultaneously, when above two kinds of modes cooling are not enough, also can adopt exhaust-heat boiler steam refrigeration as the cold source and supply, realizes that the multipotency is complementary to utilize water cold storage device to save the cold energy, when realizing that combined cycle unit stops, the continuous utilization of cold energy reaches synthesis, make full use of the energy.
Description
Technical Field
The invention belongs to the technical field of residual pressure and waste heat utilization of power plants, and particularly relates to a combined cycle power plant multi-energy complementary energy station which fully utilizes natural gas residual pressure of a combined cycle unit to generate power and refrigerate and waste heat of a waste heat boiler to refrigerate, and adopts waste heat boiler steam refrigeration as cold source supplement to supply power and cold externally.
Background
The natural gas of a pipe network is generally conveyed in a high-pressure mode, the natural gas usually needs pressure reduction treatment when reaching a combined cycle generator set, and the pressure energy generated in the pressure reduction process can be considered for recycling. At present, the common natural gas pipe network pressure energy recycling mode comprises two aspects of power generation and refrigeration. The basic principle of natural gas pipeline pressure energy power generation is that mechanical energy generated when high-pressure natural gas is expanded and depressurized is utilized to drive a generator to generate power, and refrigeration refers to that the temperature of the high-pressure natural gas is reduced after the high-pressure natural gas is expanded and depressurized and the cold energy contained in low-temperature natural gas is considered, so that the natural gas pipeline pressure energy power generation device can be utilized in a plurality of fields such as ice making, refrigeration houses, light hydrocarbon separation, rubber crushing and the like.
The exhaust gas temperature of the existing waste heat boiler of the large F-stage combined cycle unit is generally about 90 ℃. If the natural gas used by the power plant contains less or even no sulfur, the problems of acid corrosion and the like of the waste heat boiler do not need to be considered, and the smoke exhaust dew point temperature of the corresponding waste heat boiler is equal to the water dew point temperature of the smoke. Thus, in theory, the limit temperature to which the waste heat boiler flue gas can be brought down is about 60 ℃ (taking into account that the flue gas temperature should be 10 ℃ above the dew point temperature). If the waste heat in the discharged smoke can be converted into hot water by increasing the heating surface at the tail part, and air-conditioning cold water is prepared by the hot water type lithium bromide water chilling unit, the concentrated cooling is realized, the target of gradient utilization of energy is met, and considerable economic benefit can be brought to a power plant. Besides waste heat refrigeration of the waste heat boiler, the waste heat boiler is directly utilized for steam refrigeration, and the method is also an effective means for increasing the cooling capacity of the power plant and improving the economic benefit.
Disclosure of Invention
The invention aims to provide a combined cycle power plant multi-energy complementary energy station, which fully utilizes natural gas residual pressure of the combined cycle power plant to generate power and refrigerate and waste heat boiler waste heat to refrigerate, and adopts waste heat boiler steam refrigeration as cold source supplement to supply power and cold externally.
The invention is realized by adopting the following technical scheme:
a combined cycle power plant multi-energy complementary energy station comprises a natural gas pressure regulating module, a natural gas power generation and refrigeration system, a gas turbine, a waste heat boiler flue gas waste heat refrigeration system, a waste heat boiler steam refrigeration system, a water cold accumulation system and a cold supply pipeline system.
The natural gas pressure regulating module is connected with the natural gas power generation and refrigeration system in a parallel connection mode; the outlet of the natural gas pressure regulating module and the outlets of the natural gas power generation and refrigeration system are communicated to the gas turbine; the natural gas power generation and refrigeration system is used for preparing primary cold water at 5 ℃ and transmitting the primary cold water to the cold supply pipeline system or the chilled water storage system, and primary warm water at 12 ℃ returned from the cold supply pipeline system or the chilled water storage system is transmitted to the natural gas power generation and refrigeration system to form a circulation loop;
the exhaust-heat boiler flue gas waste heat refrigerating system is used for pumping a strand of hot water from a condensed water heater at the tail part of the exhaust-heat boiler to prepare primary cold water at 5 ℃ and conveying the primary cold water to the cold supply pipeline system or the water cold storage system, and primary warm water at 12 ℃ returned from the cold supply pipeline system or the water cold storage system is conveyed to the exhaust-heat boiler flue gas waste heat refrigerating system to form a circulating loop;
the waste heat boiler steam refrigeration system is used for leading out a stream of steam from a waste heat boiler medium-pressure superheated steam pipeline to prepare primary cold water at the temperature of 5 ℃ and conveying the primary cold water to the cold supply pipeline system or the water cold accumulation system, and primary warm water at the temperature of 12 ℃ returned from the cold supply pipeline system or the water cold accumulation system is conveyed to the waste heat boiler steam refrigeration system to form a circulation loop;
in the cooling pipeline system, secondary cold water at 7 ℃ from the cooling pipeline is used for being conveyed to each cooling user, and secondary warm water at 14 ℃ formed after temperature rise returns through the cooling pipeline to form a circulation loop.
The further improvement of the invention is that the natural gas power generation and refrigeration system comprises an expander, a generator, a heat exchanger, a water pump and an auxiliary heater of the natural gas power generation and refrigeration system and a natural gas pressure regulating module in the natural gas power generation and refrigeration system; the expander provides natural gas for acting, the mechanical work is used for driving the generator to generate electricity, and the cooled natural gas is communicated to the heat exchanger which is connected with the auxiliary heat exchanger in parallel and is used for exchanging heat with primary warm water at 12 ℃ from the chilled water storage system or the cold supply pipeline system; the natural gas after heat exchange and temperature rise is subjected to pressure regulation by a natural gas pressure regulating module in a natural gas power generation and refrigeration system and then is conveyed into a gas turbine; the primary warm water with the temperature of 12 ℃ from the water cold accumulation system or the cold supply pipeline system exchanges heat in the heat exchanger and cools the primary cold water to the temperature of 5 ℃, and the primary cold water enters the water cold accumulation system or the cold supply pipeline system through the water pump of the refrigeration system to form a refrigeration cycle loop.
The invention has the further improvement that the waste heat boiler flue gas waste heat refrigerating system comprises a hot water type lithium bromide refrigerator and a water pump of the waste heat refrigerating system, hot water led out from an outlet of a condensed water heater at a flue gas outlet of the waste heat boiler is used for being conveyed into the hot water type lithium bromide refrigerator, and the hot water returns to an inlet of the condensed water heater after heat exchange; the hot water type lithium bromide refrigerator is used for preparing primary cold water at 5 ℃, the primary cold water is pumped to the water cold accumulation system or the cold supply pipeline system through the water of the waste heat refrigeration system, and primary warm water at 12 ℃ returned from the water cold accumulation system or the cold supply pipeline system is conveyed to the hot water type lithium bromide refrigerator for refrigeration to form a circulation loop.
The invention has the further improvement that the waste heat boiler steam refrigerating system comprises a steam type lithium bromide refrigerator and a water pump of the steam refrigerating system, superheated steam led out from an outlet of a middle-pressure superheater of the waste heat boiler is conveyed into the steam type lithium bromide refrigerator, and returns to an inlet of a condensed water heater after heat exchange; the steam type lithium bromide refrigerator is used for preparing primary cold water at 5 ℃, the primary cold water is pumped to the water cold accumulation system or the cold supply pipeline system through a water pump of the steam refrigeration system, and primary warm water at 12 ℃ returned from the water cold accumulation system or the cold supply pipeline system is conveyed to the steam type lithium bromide refrigerator for refrigeration to form a circulation loop.
The invention has the further improvement that the water cold accumulation system comprises a water cold accumulation tank and water distributors arranged at the upper part and the lower part of the water cold accumulation tank, when the combined cycle unit operates, the water cold accumulation system is in a cold accumulation function, primary cold water at 5 ℃ generated by the natural gas power generation, refrigeration system, exhaust-heat boiler flue gas waste heat refrigeration system or exhaust-heat boiler steam refrigeration system flows in from the bottom of the water cold accumulation tank through the lower water distributor, primary warm water at 12 ℃ is pumped out from the upper part of the water cold accumulation tank through the upper water distributor and enters the natural gas power generation, refrigeration system, exhaust-heat boiler flue gas waste heat refrigeration system or exhaust-heat boiler steam refrigeration system for cooling;
when the combined cycle unit stops working, the water cold accumulation system has a cold discharge function, primary cold water at 5 ℃ generated by the water cold accumulation system flows out of the bottom of the water cold accumulation tank through the lower water distributor, enters the cold supply pipeline system, and primary warm water returned at 12 ℃ flows into the upper part of the water cold accumulation tank through the upper water distributor.
The invention has the further improvement that the cold supply pipeline system comprises a water pump for secondary water of the cold supply pipeline system and a plate heat exchanger of the cold supply pipeline system, when the combined cycle unit runs, primary cold water with the temperature of 5 ℃ from a natural gas power generation system, a refrigeration system, a waste heat boiler flue gas waste heat refrigeration system or a waste heat boiler steam refrigeration system enters the cold supply pipeline system, primary warm water with the temperature of 12 ℃ is returned to the refrigeration system after heat exchange by the plate heat exchanger of the cold supply pipeline system, and a circulation loop is formed; secondary cold water with the temperature of 7 ℃ from the cooling pipeline is conveyed to each cooling user through a water pump of secondary water of the cooling pipeline system, secondary warm water with the temperature of 14 ℃ is formed after temperature rise, and the secondary warm water returns to a plate heat exchanger of the cooling pipeline system through the cooling pipeline to form a circulation loop;
when the combined cycle unit stops working, primary cold water with the temperature of 5 ℃ from the water cold storage system enters the cold supply pipeline system, primary warm water with the temperature of 12 ℃ is returned to the water cold storage system after heat exchange of a plate heat exchanger of the cold supply pipeline system, and a circulation loop is formed; the secondary cold water with the temperature of 7 ℃ from the cooling pipeline is conveyed to each cooling user through a water pump of the secondary water of the cooling pipeline system, and secondary warm water with the temperature of 14 ℃ is formed after the temperature is raised and returns to the plate heat exchanger of the cooling pipeline system through the cooling pipeline, so that a circulation loop is formed.
The invention has at least the following beneficial technical effects:
natural gas power generation, refrigerating system: the natural gas does work through the expansion machine to drive the generator to generate electricity, meanwhile, the temperature is greatly reduced after the natural gas is expanded, the low-temperature natural gas with reduced pressure enters the heat exchanger to prepare primary cold water with the temperature of 5 ℃, the primary cold water is conveyed to a cold supply pipeline system or a water cold storage system through a water pump, and meanwhile, the natural gas is heated through heat exchange and enters the pressure regulating module; the primary warm water at 12 ℃ returned from the cold supply pipeline system or the chilled water storage system is conveyed to the heat exchanger to form circulation; the system and the unit natural gas pressure regulating module are connected in parallel, and when a natural gas power generation and refrigeration system is overhauled, an original pressure regulating system is started to ensure stable gas supply; when the cooling demand is less or the cooling is not needed, part or all of the low-temperature natural gas can enter the auxiliary heater, and enters the pressure regulating module after being heated and warmed.
Waste heat boiler flue gas waste heat refrigerating system: a strand of hot water is pumped out from a condensed water heater at the tail part of the waste heat boiler and is conveyed to a lithium bromide water chilling unit through a water supply pipeline, and the hot water is cooled in the refrigerating unit to form warm water and then returns to an outlet pipeline of the condensed water pump through a water return pipeline and a pressure pump to form circulation. Meanwhile, the lithium bromide water chilling unit prepares primary cold water at 5 ℃ and conveys the primary cold water to a cold supply pipeline system or a water cold accumulation system. The primary warm water at 12 ℃ returned from the cold supply pipeline system or the chilled water storage system returns to the flue gas waste heat refrigerating system through the water pump to form circulation. When the cooling demand is small or no cooling is needed, the amount of hot water pumped out from the condensed water heater at the tail part of the waste heat boiler can be reduced or closed through the automatic control system, and the cooling can be reduced or closed.
Waste heat boiler steam refrigerating system: a steam is led out from a medium-pressure superheated steam pipeline of the waste heat boiler to the steam type lithium bromide water chilling unit, and after the steam is cooled in the refrigeration unit to form warm water, the warm water returns to an outlet pipeline of the condensed water pump through a water return pipeline and a pressure pump to form circulation. Meanwhile, the steam type lithium bromide water chilling unit prepares primary cold water with the temperature of 5 ℃ and conveys the primary cold water to a cold supply pipeline system or a water cold accumulation system. The primary warm water at 12 ℃ returned from the cold supply pipeline system or the chilled water storage system returns to the waste heat boiler steam refrigerating system through the water pump to form circulation. When the cooling demand is smaller or no cooling is needed, the amount of the steam extracted from the medium-pressure superheated steam pipeline of the waste heat boiler can be reduced or closed through the automatic control system, and the cooling can be reduced or closed.
The water cold storage system: when cold accumulation is carried out, primary cold water at 5 ℃ generated by a natural gas residual pressure utilization system, a waste heat boiler flue gas waste heat refrigerating system or a waste heat boiler steam refrigerating system (the three are collectively called as a refrigerating system) slowly flows in from the bottom of the water cold accumulation tank through a lower water distributor, primary warm water at 12 ℃ is pumped out from the upper part of the water cold accumulation tank through an upper water distributor, enters the refrigerating system for cooling, an inclined temperature layer gradually rises in the water cold accumulation tank from bottom to top until the inclined temperature layer completely disappears, cold accumulation is completed when all cold water exists in the water cold accumulation tank, and related pipelines are closed through an automatic control system to stop cold supply of the refrigerating system to the water cold accumulation system; when the water cooling system is used for cooling, primary cold water at the temperature of 5 ℃ flows out of the bottom of the water storage tank through the lower water distributor and enters the cooling pipeline system, primary warm water returning to the temperature of 12 ℃ flows into the upper part of the water storage tank through the upper water distributor, the thermocline is gradually lowered from top to bottom in the water storage tank until the thermocline completely disappears, the water storage tank is filled with the warm water, cooling is finished, related pipelines are closed through the automatic control system, and cooling of the water storage system to the cooling pipeline system is stopped.
Cooling pipe system: primary cold water at 5 ℃ from a refrigeration system or a chilled water storage system enters a cold supply pipeline system, primary warm water at 12 ℃ is returned to the refrigeration system or the chilled water storage system after heat exchange by a plate heat exchanger, and circulation is formed; and (3) conveying the secondary cold water at 7 ℃ from the cooling pipeline to each cooling user, heating to form secondary warm water at 14 ℃, and returning the secondary warm water to the plate heat exchanger through the cooling pipeline to form circulation.
In summary, from the perspective of comprehensive utilization of energy and energy conservation and emission reduction, the combined cycle power plant provided by the invention is a multi-energy complementary energy station, and is suitable for combined cycle power plants using pipe network natural gas as fuel. But this energy station make full use of power plant's pipe network natural gas's pressure energy generates electricity and refrigerates, also utilizes exhaust-heat boiler flue gas waste heat to refrigerate simultaneously, when above two kinds of modes cooling are not enough, also can adopt exhaust-heat boiler steam refrigeration as the cold source and supply, realizes that the multipotency is complementary to utilize water cold storage device to save the cold energy, when realizing that combined cycle unit stops, the continuous utilization of cold energy reaches synthesis, make full use of the energy.
Drawings
Fig. 1 is a schematic diagram of an overall system of a multi-energy complementary energy station.
FIG. 2 is a schematic diagram of a natural gas power generation and refrigeration system.
FIG. 3 is a flue gas waste heat refrigerating system of a waste heat boiler.
FIG. 4 is a schematic diagram of a waste heat boiler steam refrigeration system.
Fig. 5 is a schematic view of a chilled water storage system.
FIG. 6 is a schematic view of a cooling duct system
Description of reference numerals:
1 is a natural gas pressure regulating module; 2, a natural gas power generation and refrigeration system; 2A is an expander; 2B is a generator; 2C is a heat exchanger; 2D is a water pump of a natural gas power generation and refrigeration system; 2E is an auxiliary heater; 2F is a natural gas pressure regulating module in the natural gas power generation and refrigeration system; 3 is a gas turbine; 4, a waste heat boiler flue gas waste heat refrigerating system; 4A is a hot water type lithium bromide refrigerator; 4B is a water pump of the waste heat refrigerating system; 5 is a waste heat boiler steam refrigerating system; 5A is a steam type lithium bromide refrigerator; 5B is a water pump of the steam refrigerating system; 6 is a water cold storage system; 6A is a water cold storage tank; 6B is a water distributor; 7 is a cooling pipeline system; 7A is a water pump for secondary water of a cooling pipeline system; 7B is a plate heat exchanger of a cooling pipeline system.
Detailed Description
The invention will be described in detail below with reference to the following drawings:
as shown in fig. 1, the present invention provides a combined cycle power plant multi-energy complementary energy station, which includes:
the natural gas pressure regulating module 1 and the natural gas power generation and refrigeration system 2 are connected in parallel. When the natural gas power generation and refrigeration system 3 works, high-pressure natural gas enters the natural gas power generation and refrigeration system 2, and enters the gas turbine 3 as fuel after pressure energy is recovered. When the natural gas power generation and refrigeration system 2 is overhauled, the original natural gas pressure regulating module 1 is started to ensure the stable gas supply of the gas turbine 3;
and a natural gas power generation and refrigeration system 2. As shown in fig. 2. Under the normal operation condition, natural gas enters the expansion machine 2A to do work, and the mechanical work drives the generator 2B to generate electricity; the generated electricity can be used as electricity for production or life in a factory; the temperature of the natural gas is greatly reduced after the natural gas passes through the expansion machine 2A, and the cooled natural gas enters the heat exchanger 2C to exchange heat with primary warm water at 12 ℃ from the water cold storage system 6 and the cold supply pipeline system 7; the natural gas after heat exchange and temperature rise is adjusted to proper natural gas pressure through a natural gas pressure regulating module 2F in the natural gas power generation and refrigeration system, then leaves the natural gas power generation and refrigeration system 2 and enters a gas turbine 3; the primary warm water with the temperature of 12 ℃ from the water cold storage system 6 and the cold supply pipeline system 7 exchanges heat in the heat exchanger 2C and cools the primary cold water to the temperature of 5 ℃, and the primary cold water enters the water cold storage system 6 and the cold supply pipeline system 7 through the water pump 2D of the refrigeration system to form a refrigeration cycle loop. After the water cold accumulation system 6 finishes the cold accumulation process, the cold energy generated by the natural gas power generation and refrigeration system 2 is directly supplied to the cold supply pipeline system 7 for cold users to use; when the cooling demand is smaller or the cooling is not needed, part or all of the low-temperature natural gas enters the auxiliary heater 2E, and enters the natural gas pressure regulating module 2F in the natural gas power generation and refrigeration system after being heated and warmed.
And a waste heat boiler flue gas waste heat refrigerating system 4. As shown in fig. 3, under normal operation, hot water led out from the outlet of the condensed water heater at the flue gas outlet of the exhaust-heat boiler is sent to the hot water type lithium bromide refrigerator 4A, and returns to the inlet of the condensed water heater after heat exchange. The hot water type lithium bromide refrigerator 4A produces primary cold water with the temperature of 5 ℃, and the primary cold water is sent to the water cold storage system 6 and the cold supply pipeline system 7 through the water pump 4B of the waste heat refrigeration system. The primary warm water of 12 ℃ returned from the water cold storage system 6 and the cold supply pipeline system 7 is conveyed to the hot water type lithium bromide refrigerator 4A for refrigeration to form circulation. After the water cold accumulation system 6 finishes the cold accumulation process, the cold energy generated by the waste heat boiler flue gas waste heat refrigerating system 4 is directly supplied to the cold supply pipeline system 7 for cold users to use.
And a waste heat boiler steam refrigerating system 5. When the natural gas power generation and refrigeration system 2 and the exhaust-heat boiler flue gas waste heat refrigeration system 4 cannot meet the cooling demand, the exhaust-heat boiler steam refrigeration system 5 is used as a cold source for supplement. As shown in fig. 4, under normal operation, the superheated steam extracted from the outlet of the intermediate-pressure superheater of the waste heat boiler is sent to the steam-type lithium bromide refrigerator 5A, and after heat exchange, is returned to the inlet of the condensate heater. The primary cold water with the temperature of 5 ℃ is prepared by the steam type lithium bromide refrigerator 5A and is sent to the water cold storage system 6 and the cold supply pipeline system 7 by the water pump 5B of the steam refrigeration system. The primary warm water at 12 ℃ returned from the water cold storage system 6 and the cold supply pipeline system 7 is conveyed to the steam type lithium bromide refrigerator 5A for refrigeration to form circulation. After the water cold storage system 6 finishes the cold storage process, the cold energy generated by the waste heat boiler steam refrigerating system 5 is directly supplied to the cold supply pipeline system 7 for cold users to use.
A chilled water storage system 6. As shown in fig. 5, when the combined cycle unit operates, the cold accumulation function of the water cold accumulation system 6 is started, that is, primary cold water at 5 ℃ generated by the natural gas power generation and refrigeration system 2, the exhaust-heat boiler flue gas waste heat refrigeration system 4 or the exhaust-heat boiler steam refrigeration system 5 (the three are collectively called as a refrigeration system) slowly flows in from the bottom of the water cold accumulation tank 6A through the lower water distributor 6B, primary warm water at 12 ℃ is pumped out from the upper part of the water cold accumulation tank 6A through the upper water distributor 6B and enters the refrigeration system for cooling, the inclined temperature layer gradually rises in the water cold accumulation tank 6A from bottom to top until the water completely disappears, and the cold accumulation process is completed when all cold water in the water cold accumulation tank 6A; when the combined cycle unit is shut down, the cold discharge function of the water cold storage system 6 is started, namely, primary cold water at 5 ℃ generated by the water cold storage system 6 flows out of the bottom of the water cold storage tank 6A through the lower water distributor 6B, enters the cold supply pipeline system 7, primary warm water returning to 12 ℃ flows into the upper part of the water cold storage tank 6A through the upper water distributor 6B, the inclined temperature layer is gradually lowered from top to bottom in the water storage tank 6A until the inclined temperature layer completely disappears, and the water storage tank is filled with the warm water, so that the cold discharge process is completed.
A cooling duct system 7. As shown in fig. 6. When the combined cycle unit operates, primary cold water at 5 ℃ from the natural gas power generation and refrigeration system 2, the exhaust-heat boiler flue gas waste heat refrigeration system 4 or the exhaust-heat boiler steam refrigeration system 5 (the three are collectively called as a refrigeration system) enters the cold supply pipeline system 7, and primary warm water at 12 ℃ after heat exchange is carried out by the plate heat exchanger 7B of the cold supply pipeline system, returns to the refrigeration system, and forms a cycle; the secondary cold water with the temperature of 7 ℃ from the cooling pipeline is conveyed to each cooling user through a water pump 7A of the secondary water of the cooling pipeline system, and secondary warm water with the temperature of 14 ℃ is formed after the temperature is raised and returns to a plate heat exchanger 7B of the cooling pipeline system through the cooling pipeline system to form circulation. When the combined cycle unit stops working, primary cold water with the temperature of 5 ℃ from the chilled water storage system 6 enters the cold supply pipeline system 7, primary warm water with the temperature of 12 ℃ is heated and returns to the chilled water storage system 6 after heat exchange is carried out by the plate heat exchanger 7B of the cold supply pipeline system, and circulation is formed; the secondary cold water with the temperature of 7 ℃ from the cooling pipeline is conveyed to each cooling user through a water pump 7A of the secondary water of the cooling pipeline system, and secondary warm water with the temperature of 14 ℃ is formed after the temperature is raised and returns to a plate heat exchanger 7B of the cooling pipeline system through the cooling pipeline system to form circulation.
In the combined cycle power plant multi-energy complementary energy station, electricity generated by the natural gas power generation and refrigeration system 2 is used as electricity for production or living in the plant; when the cooling capacity of the natural gas power generation and refrigeration system 2 exceeds the cooling demand, only the natural gas power generation and refrigeration system 2 is used for refrigeration; when the cooling capacity of the natural gas power generation and refrigeration system 2 cannot meet the cooling demand, the waste heat boiler flue gas waste heat refrigeration system 4 is used as a cold source for supplement so as to meet the cooling demand; when the cooling capacity of the natural gas power generation and refrigeration system 2 and the cooling capacity of the waste heat boiler flue gas waste heat refrigeration system 4 can not meet the cooling demand, the waste heat boiler steam refrigeration system 5 is used as a cold source for supplying so as to meet the cooling demand.
Claims (6)
1. The combined cycle power plant multi-energy complementary energy station is characterized by comprising a natural gas pressure regulating module (1), a natural gas power generation and refrigeration system (2), a gas turbine (3), a waste heat boiler flue gas waste heat refrigeration system (4), a waste heat boiler steam refrigeration system (5), a water cold storage system (6) and a cold supply pipeline system (7); wherein the content of the first and second substances,
the natural gas pressure regulating module (1) and the natural gas power generation and refrigeration system (2) are connected in parallel; the outlet of the natural gas pressure regulating module (1) and the outlet of the natural gas power generation and refrigeration system (2) are communicated to the gas turbine (3); the natural gas power generation and refrigeration system (2) is used for preparing primary cold water at the temperature of 5 ℃, and transmitting the primary cold water to the cold supply pipeline system (7) or the water cold accumulation system (6), and primary warm water at the temperature of 12 ℃ returned from the cold supply pipeline system (7) or the water cold accumulation system (6) is transmitted to the natural gas power generation and refrigeration system (2) to form a circulation loop;
the waste heat boiler flue gas waste heat refrigerating system (4) is used for pumping a strand of hot water from a condensed water heater at the tail part of the waste heat boiler to prepare primary cold water at 5 ℃ and conveying the primary cold water to the cold supply pipeline system (7) or the water cold storage system (6), and primary warm water at 12 ℃ returned from the cold supply pipeline system (7) or the water cold storage system (6) is conveyed to the waste heat boiler flue gas waste heat refrigerating system (4) to form a circulation loop;
the waste heat boiler steam refrigeration system (5) is used for leading out a steam from a waste heat boiler medium-pressure superheated steam pipeline to prepare primary cold water at the temperature of 5 ℃ and transmitting the primary cold water to the cold supply pipeline system (7) or the water cold storage system (6), and primary warm water at the temperature of 12 ℃ returned from the cold supply pipeline system (7) or the water cold storage system (6) is transmitted to the waste heat boiler steam refrigeration system (5) to form a circulation loop;
in the cooling pipeline system (7), secondary cold water with the temperature of 7 ℃ from the cooling pipeline is used for being conveyed to each cooling user, and secondary warm water with the temperature of 14 ℃ is formed after the temperature is raised and returns through the cooling pipeline to form a circulation loop.
2. The combined cycle power plant multi-energy complementary energy station as claimed in claim 1, wherein the natural gas power generation and refrigeration system (2) comprises an expander (2A), a generator (2B), a heat exchanger (2C), a water pump (2D) of the natural gas power generation and refrigeration system, an auxiliary heat device (2E) and a natural gas pressure regulating module (2F) in the natural gas power generation and refrigeration system; the expander (2A) provides natural gas to do work, mechanical work is used for driving the generator (2B) to generate electricity, and the cooled natural gas is communicated to the heat exchanger (2C) which is connected with the auxiliary heat exchanger (2E) in parallel and is used for exchanging heat with primary warm water at 12 ℃ from the water cold storage system (6) or the cold supply pipeline system (7); the natural gas after heat exchange and temperature rise is subjected to pressure regulation by a natural gas pressure regulating module (2F) in the natural gas power generation and refrigeration system and then is conveyed into a gas turbine (3); the primary warm water with the temperature of 12 ℃ from the water cold storage system (6) or the cold supply pipeline system (7) exchanges heat in the heat exchanger (2C) and cools the primary cold water to the temperature of 5 ℃, and the primary cold water enters the water cold storage system (6) or the cold supply pipeline system (7) through the water pump (2D) of the refrigeration system to form a refrigeration cycle loop.
3. The combined cycle power plant multi-energy complementary energy station as claimed in claim 1, wherein the exhaust-heat boiler flue gas waste heat refrigerating system (4) comprises a hot water type lithium bromide refrigerator (4A) and a water pump (4B) of the exhaust-heat refrigerating system, hot water led out from an outlet of a condensed water heater at a flue gas outlet of the exhaust-heat boiler is used for being conveyed into the hot water type lithium bromide refrigerator (4A), and the hot water returns to an inlet of the condensed water heater after heat exchange; the hot water type lithium bromide refrigerator (4A) is used for preparing primary cold water at 5 ℃, the primary cold water is sent to the water cold accumulation system (6) or the cold supply pipeline system (7) through the water pump (4B) of the waste heat refrigeration system, and primary warm water at 12 ℃ returned from the water cold accumulation system (6) or the cold supply pipeline system (7) is sent to the hot water type lithium bromide refrigerator (4A) for refrigeration to form a circulation loop.
4. The combined cycle power plant multipotency complementary energy station according to claim 1, characterized in that, the exhaust-heat boiler steam refrigerating system (5) comprises a steam type lithium bromide refrigerator (5A) and a water pump (5B) of the steam refrigerating system, superheated steam led out from an outlet of the intermediate pressure superheater of the exhaust-heat boiler is delivered to the steam type lithium bromide refrigerator (5A), and returns to an inlet of the condensed water heater after heat exchange; the steam type lithium bromide refrigerator (5A) is used for preparing primary cold water at 5 ℃, the primary cold water is sent to the water cold storage system (6) or the cold supply pipeline system (7) through the water pump (5B) of the steam refrigeration system, and primary warm water at 12 ℃ returned from the water cold storage system (6) or the cold supply pipeline system (7) is sent to the steam type lithium bromide refrigerator (5A) for refrigeration to form a circulation loop.
5. The combined cycle power plant multi-energy complementary energy station according to claim 1, characterized in that the chilled water storage system (6) comprises a chilled water storage tank (6A) and water distributors (6B) arranged at the upper and lower parts of the chilled water storage tank (6A), when the combined cycle unit operates, the water cold accumulation system (6) has a cold accumulation function, primary cold water at 5 ℃ generated by the natural gas power generation and refrigeration system (2), the waste heat boiler flue gas waste heat refrigeration system (4) or the waste heat boiler steam refrigeration system (5) flows in from the bottom of the water cold accumulation tank (6A) through the lower water distributor (6B), primary warm water at 12 ℃ is pumped out from the upper part of the water cold accumulation tank (6A) through the upper water distributor (6B) and enters the natural gas power generation and refrigeration system (2), the waste heat boiler flue gas waste heat refrigeration system (4) or the waste heat boiler steam refrigeration system (5) for cooling;
when the combined cycle unit stops working, the water cold accumulation system (6) is in a cold discharge function, primary cold water with the temperature of 5 ℃ generated by the water cold accumulation system (6) flows out of the bottom of the water cold accumulation tank (6A) through the lower water distributor (6B), enters the cold supply pipeline system (7), and primary warm water with the temperature of 12 ℃ returned flows into the upper part of the water cold accumulation tank (6A) through the upper water distributor (6B).
6. The combined cycle power plant multipotency complementary energy station according to claim 1, characterized in that the cooling pipeline system (7) comprises a water pump (7A) for secondary water of the cooling pipeline system and a plate heat exchanger (7B) for the cooling pipeline system, when the combined cycle unit is operated, primary cold water at 5 ℃ from the natural gas power generation and refrigeration system (2), the exhaust-heat boiler flue gas waste heat refrigeration system (4) or the exhaust-heat boiler steam refrigeration system (5) enters the cooling pipeline system (7), and primary warm water with the temperature of 12 ℃ is returned to the refrigeration system after heat exchange by the plate heat exchanger (7B) of the cooling pipeline system to form a circulation loop; secondary cold water with the temperature of 7 ℃ from the cooling pipeline is conveyed to each cooling user through a water pump (7A) of secondary water of the cooling pipeline system, secondary warm water with the temperature of 14 ℃ is formed after the temperature is raised, and the secondary warm water returns to a plate type heat exchanger (7B) of the cooling pipeline system through the cooling pipeline system to form a circulation loop;
when the combined cycle unit stops working, primary cold water at 5 ℃ from the chilled water storage system (6) enters the cold supply pipeline system (7), primary warm water heated to 12 ℃ is returned to the chilled water storage system (6) after heat exchange by a plate heat exchanger (7B) of the cold supply pipeline system, and a circulation loop is formed; the secondary cold water with the temperature of 7 ℃ from the cooling pipeline is conveyed to each cooling user through a water pump (7A) of the secondary water of the cooling pipeline system, and secondary warm water with the temperature of 14 ℃ is formed after the temperature is raised and returns to a plate type heat exchanger (7B) of the cooling pipeline system through the cooling pipeline to form a circulation loop.
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