CN114440487A - System device for reducing backpressure of coal-fired unit - Google Patents

System device for reducing backpressure of coal-fired unit Download PDF

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Publication number
CN114440487A
CN114440487A CN202210113880.8A CN202210113880A CN114440487A CN 114440487 A CN114440487 A CN 114440487A CN 202210113880 A CN202210113880 A CN 202210113880A CN 114440487 A CN114440487 A CN 114440487A
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Prior art keywords
heat exchange
equipment
cold
unit
liquid
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Inventor
马明俊
李振亚
范雪飞
刘传亮
张广源
张琳
边文杰
蒋励
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Shanghai Power Equipment Research Institute Co Ltd
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Shanghai Power Equipment Research Institute Co Ltd
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Priority to CN202210113880.8A priority Critical patent/CN114440487A/en
Publication of CN114440487A publication Critical patent/CN114440487A/en
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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
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/10—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point with several cooling stages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • 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
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/40—Fluid line arrangements
    • 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
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • 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
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/14—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
    • 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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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

The invention relates to a system device for reducing the backpressure of a coal-fired unit, which comprises a compression unit, a refrigerant separation and storage unit and a mixing output unit, wherein the compression unit is connected with the refrigerant separation and storage unit; the compression unit comprises at least 3 stages of compression devices; the refrigerant separation and storage unit comprises a cold box, low-temperature turbine expansion equipment and gas-liquid separation equipment which are sequentially arranged; the material outlet of the compression unit is connected with the material inlet of the cold box; the gas phase outlet of the gas-liquid separation equipment is connected with the gas phase inlet of the cold box; the cold box is connected in parallel with a cold accumulation device; the cold accumulation device is connected with the first heat exchange device in parallel; a liquid outlet of the gas-liquid separation equipment is connected with a liquid phase inlet of the first heat exchange equipment; and a liquid phase outlet of the first heat exchange equipment is connected with a condenser in the mixing output unit. The cooling capacity generated by the liquefied air is used for reducing the temperature of cooling water or cooling air in a condenser of the coal-fired unit, so that the back pressure of the low-coal-fired unit is controlled, the stable operation of the unit is realized, and the heat efficiency of a circulating system is improved.

Description

System device for reducing backpressure of coal-fired unit
Technical Field
The invention relates to the field of power generation, in particular to a system device for reducing the backpressure of a coal-fired unit.
Background
At present, the power generation with a large proportion is still thermal power generation, and a steam turbine set is generally used in the thermal power generation process.
The CN110318961A discloses a steam turbine set of a power plant and a power generation method thereof, wherein the steam turbine set comprises a solar heat exchanger set, a steam brayton cycle and a steam rankine cycle, the solar heat exchanger set comprises a first superheater, a first reheater, a second superheater and a second reheater, the steam brayton cycle comprises a compressor, a reheater, a high-pressure turbine, an intermediate heat exchanger and a first power generator, and the steam rankine cycle comprises a condensed water pump, a low-pressure heater, a deaerator, a feed water pump, a high-pressure heater, an intermediate-pressure turbine, a low-pressure turbine, a condenser and a second power generator. Through organically combining the Brayton cycle and the Rankine cycle, on one hand, the thermal efficiency of the Rankine cycle can be obviously improved, on the other hand, the flow of the working medium passing through the high-pressure turbine is very large, the internal efficiency of the high-pressure turbine is improved, the thermal efficiency of the Brayton cycle is ensured, and finally the thermal efficiency of the whole unit is obviously improved.
CN108868922A adopts a thermodynamic system of a back pressure type water feeding pump turbine and a main turbine, which belongs to the technical field of thermal power generation, wherein the steam inlet of the back pressure type water feeding pump turbine is from the steam exhaust of an ultra-high pressure cylinder, the steam inlet of a first high pressure heater group is from the steam exhaust of the ultra-high pressure cylinder, the steam inlet of a second high pressure heater group is from the steam extraction of the back pressure type water feeding pump turbine, the steam inlet of a third high pressure heater group is from the steam exhaust of the high pressure cylinder, the steam inlet of a fourth high pressure heater group is from the steam extraction of the back pressure type water feeding pump turbine, the steam inlet of a mixed heater group is from the steam exhaust of the back pressure type water feeding pump turbine and the steam exhaust or steam extraction of an intermediate pressure cylinder, and the steam inlet of the low pressure heater group is from the steam extraction of a low pressure cylinder. The exhaust steam of high pressure cylinder and the exhaust steam of taking out of intermediate pressure cylinder, alternate at the backheat system of back pressure formula feed water pump steam turbine, whole system adjusts simpler, and the variable operating mode operation is safer, high-efficient.
However, in the operation process of the current steam turbine, the change of the environmental temperature is large, especially the high temperature in summer, the back pressure of the steam turbine is increased, the exhaust temperature is further increased, the exhaust cylinder of the low-pressure cylinder is deformed, and the final-stage blade flutters, so that the power generation efficiency is also influenced.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a system device for reducing the backpressure of a coal-fired unit, and solve the problem that the backpressure of the existing steam turbine unit cannot be effectively controlled in the operation process.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a system device for reducing the backpressure of a coal-fired unit, which comprises a compression unit, a refrigerant separation and storage unit and a mixing output unit, wherein the compression unit is used for compressing refrigerant;
the compression unit comprises at least 3 stages of compression devices;
the refrigerant separation and storage unit comprises a cold box, low-temperature turbine expansion equipment and gas-liquid separation equipment which are sequentially arranged;
the material outlet of the compression unit is connected with the material inlet of the cold box;
the gas phase outlet of the gas-liquid separation equipment is connected with the gas phase inlet of the cold box;
the cold boxes are connected in parallel and provided with cold accumulation equipment;
the cold accumulation device is connected with the first heat exchange device in parallel;
the liquid outlet of the gas-liquid separation equipment is connected with the liquid phase inlet of the first heat exchange equipment;
and a liquid phase outlet of the first heat exchange equipment is connected with a condenser in the mixing output unit.
According to the system device provided by the invention, the surplus electric quantity of new energy or a power grid is converted into cold energy, the liquid compressed air energy storage system is coupled with the thermal power generation system, and the cold energy generated by liquefied air is used for reducing the temperature of cooling water or cooling air in a condenser of a coal-fired unit, so that the back pressure of the low-coal-fired unit is controlled, the stable operation of the unit is realized, and the heat efficiency of a circulating system is improved.
In the present invention, the compression unit comprises at least 3 stages of compression devices, such as 3, 4, 5, 6, 7 or 8 stages, but not limited to the recited values, and other combinations not recited within the scope are equally applicable.
As a preferred technical scheme of the present invention, a heat exchange device set is correspondingly configured in the compression unit and the compression device.
As a preferable technical scheme of the invention, a heat source outlet in the heat exchange equipment set is connected with heat storage equipment.
As the preferable technical scheme of the invention, the cold source outlet in the heat exchange equipment set is connected with the cold storage equipment.
As a preferable technical scheme of the present invention, a mixer or a second heat exchange device is further disposed between the liquid phase outlet of the first heat exchange device and the condenser in the mixing output unit.
As a preferable technical scheme of the invention, a mixer is arranged between a liquid phase outlet of the first heat exchange equipment and a condenser in the mixing output unit, and a material outlet of the mixer is connected with a feed inlet of the condenser.
As a preferred technical scheme of the present invention, a second heat exchange device is further disposed between the liquid phase outlet of the first heat exchange device and the condenser in the mixed output unit, the cold medium after heat exchange returns to the compression unit, and the heat medium after heat exchange enters the condenser through a pipeline.
As a preferable technical scheme of the present invention, a liquid-air storage device and a cryogenic pump are further sequentially disposed between the liquid outlet of the gas-liquid separation device and the first heat exchange device.
As a preferred technical scheme of the present invention, the cold medium after the heat exchange of the second heat exchange device enters the heat exchange turbine unit through a pipeline;
preferably, the heat exchange turbine unit comprises at least 4 sets of heat exchange-turbine combination equipment, such as 4, 5, 6, 7, 8 or 9 sets, etc., but not limited to the recited values, and other combinations not recited within this range are equally applicable.
Preferably, the heat exchange-turbine combined equipment comprises a heat exchanger and a turbine which are connected in sequence, and the cold medium after heat exchange enters the turbine through a pipeline.
The medium finally discharged from the turbine can be discharged directly into the atmosphere.
As the preferred technical scheme of the invention, the system device comprises a compression unit, a refrigerant separation and storage unit and a mixing output unit;
the compression unit comprises at least 3 stages of compression devices; a heat exchange equipment group is correspondingly matched with the compression equipment in the compression unit; a heat source outlet in the heat exchange equipment set is connected with heat storage equipment; a cold source outlet in the heat exchange equipment set is connected with cold storage equipment;
the refrigerant separation and storage unit comprises a cold box, low-temperature turbine expansion equipment and gas-liquid separation equipment which are sequentially arranged;
the material outlet of the compression unit is connected with the material inlet of the cold box;
the gas phase outlet of the gas-liquid separation equipment is connected with the gas phase inlet of the cold box;
the cold boxes are connected in parallel and provided with cold accumulation equipment;
the cold accumulation device is connected with the first heat exchange device in parallel;
the liquid outlet of the gas-liquid separation equipment is connected with the liquid phase inlet of the first heat exchange equipment;
a liquid phase outlet of the first heat exchange equipment is connected with a condenser in the mixing output unit;
a second heat exchange device is arranged between a liquid phase outlet of the first heat exchange device and a condenser in the mixed output unit, a cold medium after heat exchange returns to the compression unit, and a hot medium after heat exchange enters the condenser through a pipeline; a liquid-air storage device and a low-temperature pump are sequentially arranged between the liquid outlet of the gas-liquid separation device and the first heat exchange device; the cold medium after heat exchange of the second heat exchange equipment enters the heat exchange turbine unit through a pipeline; the heat exchange turbine unit comprises at least 4 groups of heat exchange-turbine combined equipment; the heat exchange-turbine combined equipment comprises a heat exchanger and a turbine which are sequentially connected, and a cold medium after heat exchange enters the turbine through a pipeline.
In the invention, the flow rate of circulating water entering the condenser is required to be controlled to be 120kg/s, the temperature measurement is 15-25 ℃, the temperature of cold air passing through the cold accumulation equipment entering the heat exchanger is-20 to-10 ℃, the flow rate is 100kg/s, the temperature of back pressure after mixing is ensured to be 0-15 ℃, and the back pressure is ensured to be 2.8-6.8kPa during the application process. Thereby further ensuring the enhancement of the power generation efficiency.
Compared with the prior art, the invention at least has the following beneficial effects:
(1) the system device provided by the invention couples the liquid compressed air energy storage system with the thermal power generation system, and reduces the temperature of cooling water or cooling air of the coal-fired unit by using the cold energy generated by liquefied air, thereby controlling the back pressure of the low-coal-fired unit, realizing the stable operation of the unit and improving the heat efficiency of a circulating system.
(2) The system device of the invention can ensure the safe operation of the unit, reduce the deformation of the exhaust cylinder of the low pressure cylinder, reduce the vibration of the last stage blade and reduce the stress of the flange and the bolt of the exhaust part to a certain extent.
(3) The ideal enthalpy drop of the steam turbine can be obviously improved, and the efficiency of thermal power generation under the same flow is obviously improved. The steam power generation efficiency of the thermal power generation is improved by 3-10% compared with that of the conventional unit (the system device in the invention is not adopted).
Drawings
FIG. 1 is a schematic view of a system for reducing back pressure of a coal-fired unit according to example 1 of the present invention;
FIG. 2 is a schematic view of a system for reducing the back pressure of a coal-fired unit according to example 2 of the present invention;
FIG. 3 is a schematic view of a system for reducing the back pressure of a coal-fired unit according to embodiment 3 of the present invention.
In the figure: 1-a first compressor, 2-a first heat exchanger, 3-a second compressor, 4-a second heat exchanger, 5-a third compressor, 6-a third heat exchanger, 7-a cold box, 8-a cryogenic turboexpansion plant, 9-a gas-liquid separation plant, 10-a first heat exchange plant, 11.1-a mixer, 11.2-a second heat exchange plant, 12-a condenser, 13-a liquid-air storage plant, 14-a cryogenic pump, 15.1-a heat exchanger, 15.2-a turbine;
a-cold storage equipment, B-cold storage equipment and C-heat storage equipment.
The present invention is described in further detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
Detailed Description
To better illustrate the invention and to facilitate the understanding of the technical solutions thereof, typical but non-limiting examples of the invention are as follows:
example 1
The present embodiment provides a system device for reducing back pressure of a coal-fired unit, as shown in fig. 1, the system device includes a compression unit, a refrigerant separation storage unit, and a mixing output unit;
the compression unit is 3-stage compression equipment comprising a first compressor 1, a second compressor 3 and a third compressor 5;
the refrigerant separation and storage unit comprises a cold box 7, a low-temperature turbine expansion device 8 and a gas-liquid separation device 8 which are arranged in sequence;
the material outlet of the compression unit is connected with the material inlet of the cold box 7;
the gas phase outlet of the gas-liquid separation equipment 8 is connected with the gas phase inlet of the cold box 7;
the cold box 7 is connected in parallel with a cold accumulation device A;
the cold accumulation device A is connected with the first heat exchange device 10 in parallel;
the liquid outlet of the gas-liquid separation device 8 is connected with the liquid phase inlet of the first heat exchange device 10;
and a liquid phase outlet of the first heat exchange device 10 is connected with a condenser 12 in the mixing output unit.
And a heat exchange equipment group is correspondingly and cooperatively arranged in the compression unit with the compression equipment, namely, the compression unit comprises 3 heat exchangers, namely a first heat exchanger 2, a second heat exchanger 4 and a third heat exchanger 6.
And a heat source outlet in the heat exchange equipment group is connected with the heat storage equipment C.
And a cold source outlet in the heat exchange equipment set is connected with the cold storage equipment B.
A mixer 11.1 is arranged between a liquid phase outlet of the first heat exchange device 10 and a condenser 12 in the mixing output unit, and a material outlet of the mixer 11.1 is connected with a feed inlet of the condenser 12.
Example 2
The present embodiment provides a system device for reducing back pressure of a coal-fired unit, as shown in fig. 2, the system device includes a compression unit, a refrigerant separation storage unit, and a mixing output unit;
the compression unit is 3-stage compression equipment comprising a first compressor 1, a second compressor 3 and a third compressor 5;
the refrigerant separation and storage unit comprises a cold box 7, a low-temperature turbine expansion device 8 and a gas-liquid separation device 8 which are sequentially arranged;
the material outlet of the compression unit is connected with the material inlet of the cold box 7;
the gas phase outlet of the gas-liquid separation equipment 8 is connected with the gas phase inlet of the cold box 7;
the cold box 7 is provided with a cold accumulation device A in parallel;
the cold accumulation device A is connected with the first heat exchange device 10 in parallel;
a liquid outlet of the gas-liquid separation device 8 is connected with a liquid phase inlet of the first heat exchange device 10;
and a liquid phase outlet of the first heat exchange device 10 is connected with a condenser 12 in the mixing output unit.
And a heat exchange equipment group is correspondingly and cooperatively arranged in the compression unit with the compression equipment, namely, the heat exchange equipment group comprises 3 heat exchangers, namely a first heat exchanger 2, a second heat exchanger 4 and a third heat exchanger 6.
And a heat source outlet in the heat exchange equipment set is connected with the heat storage equipment C.
And a cold source outlet in the heat exchange equipment set is connected with the cold storage equipment B.
And a second heat exchange device 11.2 is also arranged between the liquid phase outlet of the first heat exchange device 10 and the condenser 12 in the mixing output unit, the cold medium after heat exchange returns to the compression unit, and the heat medium after heat exchange enters the condenser 12 through a pipeline.
Example 3
The embodiment provides a system device for reducing the backpressure of a coal-fired unit, as shown in fig. 3, the system device comprises a compression unit, a refrigerant separation and storage unit and a mixing output unit;
the compression unit is 3-stage compression equipment comprising a first compressor 1, a second compressor 3 and a third compressor 5;
the refrigerant separation and storage unit comprises a cold box 7, a low-temperature turbine expansion device 8 and a gas-liquid separation device 8 which are sequentially arranged;
the material outlet of the compression unit is connected with the material inlet of the cold box 7;
the gas phase outlet of the gas-liquid separation equipment 8 is connected with the gas phase inlet of the cold box 7;
the cold box 7 is connected in parallel with a cold accumulation device A;
the cold accumulation device A is connected with the first heat exchange device 10 in parallel;
a liquid outlet of the gas-liquid separation device 8 is connected with a liquid phase inlet of the first heat exchange device 10;
and a liquid phase outlet of the first heat exchange device 10 is connected with a condenser 12 in the mixing output unit.
And a heat exchange equipment group is correspondingly and cooperatively arranged in the compression unit with the compression equipment, namely, the heat exchange equipment group comprises 3 heat exchangers, namely a first heat exchanger 2, a second heat exchanger 4 and a third heat exchanger 6.
And a heat source outlet in the heat exchange equipment group is connected with the heat storage equipment C.
And a cold source outlet in the heat exchange equipment set is connected with the cold storage equipment B.
A second heat exchange device 11.2 is further arranged between the liquid phase outlet of the first heat exchange device 10 and the condenser 12 in the mixing output unit, the cold medium after heat exchange returns to the compression unit, and the hot medium after heat exchange enters the condenser 12 through a pipeline.
And a liquid-air storage device 13 and a low-temperature pump 14 are sequentially arranged between the liquid outlet of the gas-liquid separation device 8 and the first heat exchange device 10.
The cold medium after heat exchange of the second heat exchange device 11.2 enters the heat exchange turbine unit through a pipeline;
the heat exchange turbine unit comprises at least 4 groups of heat exchange-turbine combined equipment;
the heat exchange-turbine combined equipment comprises a heat exchanger 15.1 and a turbine 15.2 which are connected in sequence, and a cold medium after heat exchange enters the turbine 15.2 through a pipeline.
Application example 1
The application example is performed by using the system device in embodiment 1, and specifically includes: air enters a cold box after being subjected to primary compression, primary heat exchange, secondary compression, secondary heat exchange, tertiary compression and tertiary heat exchange in sequence, then is subjected to gas-liquid separation in sequence through a low-temperature turbine to obtain liquid air, part of cold energy is recycled through heat exchange and then is mixed with a working medium of a condenser in a mixer, the temperature is 15 ℃ according to the flow (100kg/s) of the working medium of the condenser, the temperature of cold air entering the mixer after being liquefied is adjusted adaptively at the moment to be-30 ℃, the flow is 105kg/s, the temperature of mixed back pressure is 8 ℃, and the back pressure is 4.8 kPa.
Wherein the pressure of the gas obtained after the first compression is 0.85 MPa; the pressure of the gas obtained after the second compression is 6.5 MPa; the temperature of the liquid air obtained after the gas-liquid separation is-175 ℃; the pressure of the liquid air obtained after the gas-liquid separation is 1.5 MPa;
application example 2
The application example is performed by using the system device in embodiment 2, and specifically includes: the method comprises the steps of sequentially performing primary compression, primary heat exchange, secondary compression, secondary heat exchange, tertiary compression and tertiary heat exchange on air, then enabling the air to enter a cold box, sequentially performing gas-liquid separation through a low-temperature turbine, obtaining liquid air, performing heat exchange on the liquid air after heat exchange, recovering part of cold energy to cool a cold storage device, and then performing heat exchange on the liquid air and a working medium of a condenser, wherein the temperature of the cold air after adaptive cold storage entering a heat exchanger is-30 ℃ and 210kg/s according to the flow (100kg/s) and the temperature (15 ℃) of the working medium of the condenser, the temperature of the mixed back pressure is 0 ℃ and the back pressure is 2.8 kPa. After heat exchange, the expanded working medium can be returned to the primary compressed air inlet to form closed circulation.
Wherein the pressure of the gas obtained after the first compression is 0.9 MPa; the pressure of the gas obtained after the second compression is 7 MPa; the temperature of the liquid air obtained after the gas-liquid separation is-160 ℃; the pressure of the liquid air obtained after the gas-liquid separation is 2 MPa;
application example 3
The application example is performed by using the system device in embodiment 3, and specifically includes: the method comprises the following steps of sequentially performing primary compression, primary heat exchange, secondary compression, secondary heat exchange, tertiary compression and tertiary heat exchange on air, then enabling the air to enter a cold box, sequentially performing gas-liquid separation through a low-temperature turbine, obtaining liquid air, recovering part of cold energy after heat exchange, performing heat exchange with working media of a condenser after cold storage equipment, enabling the gas after heat exchange to enter a heat exchange turbine unit, and achieving energy reutilization through multi-stage heating-turbine.
The flow rate of circulating water entering the condenser is 100kg/s, the temperature is measured to be 25 ℃, the temperature of cold air passing through the cold accumulation equipment and entering the heat exchanger is adjusted to be-20 ℃, the flow rate is 120kg/s, the temperature of back pressure after mixing is 15 ℃, and the back pressure is 6.8 kPa.
Wherein the pressure of the gas obtained after the first compression is 0.8 MPa; the pressure of the gas obtained after the second compression is 6 MPa; the temperature of the liquid air obtained after the gas-liquid separation is-170 ℃; the pressure of the liquid air obtained after the gas-liquid separation is 0.8 MPa;
according to the results of the application examples of the embodiments, the system device provided by the invention couples the liquid compressed air energy storage system with the thermal power generation system, and reduces the cooling water or cooling air temperature of the coal-fired unit by using the cooling capacity generated by the liquefied air, so that the back pressure of the low-coal-fired unit is controlled, the stable operation of the unit is realized, and the thermal efficiency of the circulating system is improved.
It is to be noted that the present invention is described by the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the detailed structural features, that is, it is not meant to imply that the present invention must be implemented by relying on the detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims (10)

1. A system device for reducing the backpressure of a coal-fired unit is characterized by comprising a compression unit, a refrigerant separation and storage unit and a mixing output unit;
the compression unit comprises at least 3 stages of compression devices;
the refrigerant separation and storage unit comprises a cold box, low-temperature turbine expansion equipment and gas-liquid separation equipment which are sequentially arranged;
the material outlet of the compression unit is connected with the material inlet of the cold box;
the gas phase outlet of the gas-liquid separation equipment is connected with the gas phase inlet of the cold box;
the cold boxes are connected in parallel and provided with cold accumulation equipment;
the cold accumulation device is connected with the first heat exchange device in parallel;
the liquid outlet of the gas-liquid separation equipment is connected with the liquid phase inlet of the first heat exchange equipment;
and a liquid phase outlet of the first heat exchange equipment is connected with a condenser in the mixing output unit.
2. The system device as claimed in claim 1, wherein a heat exchange equipment set is provided in the compression unit corresponding to the compression equipment.
3. The system apparatus as claimed in claim 2, wherein the heat source outlet of the heat exchange device set is connected to the heat storage device.
4. The system device as claimed in claim 2 or 3, wherein the cold source outlet of the heat exchange device group is connected with the cold storage device.
5. The system arrangement according to claims 1-4, characterized in that a mixer or a second heat exchange device is further arranged between the liquid phase outlet of the first heat exchange device and the condenser in the mixing output unit.
6. The system device according to claim 5, wherein a mixer is arranged between the liquid phase outlet of the first heat exchange equipment and the condenser in the mixing output unit, and a material outlet of the mixer is connected with a feed inlet of the condenser.
7. The system device according to claim 5, wherein a second heat exchange device is arranged between the liquid phase outlet of the first heat exchange device and a condenser in the mixing output unit, the cold medium after heat exchange returns to the compression unit, and the hot medium after heat exchange enters the condenser through a pipeline.
8. The system apparatus as set forth in claim 7, wherein a liquid-air storage device and a cryogenic pump are further disposed between the liquid outlet of the gas-liquid separation device and the first heat exchange device in sequence.
9. The system device of claim 7, wherein the cold medium after heat exchange in the second heat exchange device enters the heat exchange turbine unit through a pipeline;
preferably, the heat exchange turbine unit comprises at least 4 sets of heat exchange-turbine combination equipment;
preferably, the heat exchange-turbine combined equipment comprises a heat exchanger and a turbine which are connected in sequence, and the cold medium after heat exchange enters the turbine through a pipeline.
10. The system device according to any one of claims 1 to 9, wherein the system device comprises a compression unit, a refrigerant separation and storage unit and a mixing and output unit;
the compression unit comprises at least 3 stages of compression devices; a heat exchange equipment group is correspondingly matched with the compression equipment in the compression unit; a heat source outlet in the heat exchange equipment set is connected with heat storage equipment; a cold source outlet in the heat exchange equipment set is connected with cold storage equipment;
the refrigerant separation and storage unit comprises a cold box, low-temperature turbine expansion equipment and gas-liquid separation equipment which are sequentially arranged;
the material outlet of the compression unit is connected with the material inlet of the cold box;
the gas phase outlet of the gas-liquid separation equipment is connected with the gas phase inlet of the cold box;
the cold boxes are connected in parallel and provided with cold accumulation equipment;
the cold accumulation device is connected with the first heat exchange device in parallel;
the liquid outlet of the gas-liquid separation equipment is connected with the liquid phase inlet of the first heat exchange equipment;
a liquid phase outlet of the first heat exchange equipment is connected with a condenser in the mixing output unit;
a second heat exchange device is arranged between a liquid phase outlet of the first heat exchange device and a condenser in the mixed output unit, a cold medium subjected to heat exchange returns to the compression unit, and a heat medium subjected to heat exchange enters the condenser through a pipeline; a liquid-air storage device and a low-temperature pump are sequentially arranged between the liquid outlet of the gas-liquid separation device and the first heat exchange device; the cold medium after heat exchange of the second heat exchange equipment enters the heat exchange turbine unit through a pipeline; the heat exchange turbine unit comprises at least 4 groups of heat exchange-turbine combined equipment; the heat exchange-turbine combined equipment comprises a heat exchanger and a turbine which are sequentially connected, and a cold medium after heat exchange enters the turbine through a pipeline.
CN202210113880.8A 2022-01-30 2022-01-30 System device for reducing backpressure of coal-fired unit Pending CN114440487A (en)

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CN112178615A (en) * 2020-09-29 2021-01-05 西安热工研究院有限公司 Electric-steam air-cooling multi-combined supply system based on liquid compressed air energy storage system
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US20200182542A1 (en) * 2017-06-01 2020-06-11 Institute Of Engineering Thermophysics, Chinese Academy Of Sciences Staged cryogenic storage type supercritical compressed air energy storage system and method
CN111022139A (en) * 2019-11-27 2020-04-17 中国大唐集团科学技术研究院有限公司火力发电技术研究院 Coal-fired generating set coupling liquefied air energy storage power generation system
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