CN112503797A - Refrigerating system based on gas-electricity complementation - Google Patents
Refrigerating system based on gas-electricity complementation Download PDFInfo
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- 238000005057 refrigeration Methods 0.000 claims abstract description 98
- 239000007789 gas Substances 0.000 claims abstract description 45
- 238000002485 combustion reaction Methods 0.000 claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000003546 flue gas Substances 0.000 claims abstract description 16
- 239000006096 absorbing agent Substances 0.000 claims description 35
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims description 18
- 230000005611 electricity Effects 0.000 claims description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 26
- 239000003345 natural gas Substances 0.000 abstract description 12
- 239000002918 waste heat Substances 0.000 abstract description 5
- 238000001816 cooling Methods 0.000 abstract description 4
- 238000011084 recovery Methods 0.000 abstract description 4
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 238000010248 power generation Methods 0.000 abstract description 3
- 239000002609 medium Substances 0.000 description 45
- 239000003507 refrigerant Substances 0.000 description 15
- 239000000498 cooling water Substances 0.000 description 14
- 230000005540 biological transmission Effects 0.000 description 11
- 230000009977 dual effect Effects 0.000 description 6
- 230000010354 integration Effects 0.000 description 5
- 239000000779 smoke Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000006163 transport media Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000002699 waste material 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
- F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
- F25B25/02—Compression-sorption machines, plants, or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
- F02B63/04—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
- F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Sorption Type Refrigeration Machines (AREA)
Abstract
本发明公开了一种基于气电互补的制冷系统，所述系统包括燃气内燃机、电路单元、双效制冷单元以及制冷单元，所述燃气内燃机分别与所述双效制冷单元以及所述电路单元相连接，所述燃气内燃机产生的烟气以及缸套水传输至所述双效制冷单元；所述燃气内燃机为电路单元提供能量以使得电路单元产生电能；所述电路单元与所述制冷单元以及所述双效制冷单元相连接；所述双效制冷单元与所述制冷单元相连接。本发明提供的制冷系统通过双效制冷单元回收利用燃气内燃机形成的高温烟气以及高温缸套水，实现燃气发电制冷与余热回收制冷的耦合，实现系统冷输出最大化，提高了天然气的利用率。
The invention discloses a refrigeration system based on gas-electricity complementation. The system includes a gas-fired internal combustion engine, a circuit unit, a double-effect refrigeration unit and a refrigeration unit. The gas-fired internal combustion engine is respectively connected to the double-effect refrigeration unit and the circuit unit. connected, the flue gas and cylinder jacket water generated by the gas internal combustion engine are transmitted to the double-effect refrigeration unit; the gas internal combustion engine provides energy for the circuit unit to make the circuit unit generate electrical energy; the circuit unit is connected with the refrigeration unit and all The double-effect refrigeration unit is connected; the double-effect refrigeration unit is connected with the refrigeration unit. The refrigeration system provided by the invention recycles the high-temperature flue gas and high-temperature cylinder jacket water formed by a gas-fired internal combustion engine through a double-effect refrigeration unit, realizes the coupling of gas-fired power generation refrigeration and waste heat recovery refrigeration, maximizes the cooling output of the system, and improves the utilization rate of natural gas .
Description
Technical Field
The invention relates to the technical field of natural gas, in particular to a refrigerating system based on gas-electricity complementation.
Background
With the increasing prominence of global warming, energy crisis and environmental pollution problems, energy-saving and environment-friendly technologies are urgently needed. Accelerating the efficient utilization of the developed clean energy at the end of a user is an important path for promoting the coordinated and stable development and constructing a clean, low-carbon, safe and efficient modern energy system.
Under the background, aiming at the characteristics of natural climate in southern areas of China, the energy demand of hotel type users and users in small industrial parks is solved, and the development of complementary energy supply high-efficiency refrigeration technology mainly based on natural gas and secondarily based on electric energy has important significance. However, in the currently commonly used cooling mode of the gas engine heat pump, the waste heat of the gas engine is usually directly discharged to the outdoor environment through the radiator, so that the utilization rate of the primary energy of the system is low in the cooling process of the gas engine heat pump.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a refrigeration system based on gas-electricity complementation, aiming at the defects of the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a refrigerating system based on gas-electricity complementation comprises a gas internal combustion engine, a circuit unit, a double-effect refrigerating unit and a refrigerating unit, wherein the gas internal combustion engine is respectively connected with the double-effect refrigerating unit and the circuit unit, and smoke generated by the gas internal combustion engine and cylinder sleeve water are transmitted to the double-effect refrigerating unit; the gas internal combustion engine provides energy for the circuit unit to enable the circuit unit to generate electric energy; the circuit unit is connected with the refrigerating unit and the double-effect refrigerating unit; the double-effect refrigerating unit is connected with the refrigerating unit.
The refrigeration system based on gas-electricity complementation, wherein the double-effect refrigeration unit comprises a high-pressure generation unit, a low-pressure generation unit, an absorber, a first condenser and a first evaporator; the absorber is respectively connected with the high-pressure generation unit and the low-pressure generation unit, the high-pressure generation unit is connected with the low-pressure generation unit, and the first condenser, the first evaporator and the absorber are sequentially connected; the absorber, the high pressure generation unit, the low pressure generation unit, the first condenser and the first evaporator form a first circulation loop, and the absorber, the high pressure generation unit, the low pressure generation unit, the first condenser and the first evaporator form a second circulation loop.
The refrigerating system based on the gas-electricity complementation is characterized in that the high-pressure generating unit is connected with a smoke outlet of a gas internal combustion engine, and the low-pressure generating unit and a sleeve cylinder of the gas internal combustion engine form a heat exchange loop.
The refrigeration system based on gas-electricity complementation, wherein the circulating media of the first circulating loop are lithium bromide solution.
The refrigeration system based on gas-electricity complementation, wherein the concentration of the lithium bromide solution flowing out of the absorber is less than that of the lithium bromide solution flowing in the absorber.
The refrigerating system based on gas-electricity complementation comprises a refrigerating unit, wherein the refrigerating unit comprises a compressor, a second condenser and a second evaporator, the compressor is connected with a circuit unit, the compressor, the second condenser and the second evaporator form a loop, and the second evaporator is connected with a double-effect refrigerating unit and provides a cold source for external equipment.
The gas-electric complementation based refrigeration system, wherein the refrigeration unit further comprises a pressure reducing valve, and the pressure reducing valve is positioned between the condenser and the evaporator.
The refrigerating system based on the gas-electricity complementation is characterized in that the circuit unit comprises a generator and a circuit integrated board which are sequentially connected, the generator is connected with a gas internal combustion engine, the circuit integrated board is connected with the refrigerating unit and the double-effect refrigerating unit, and the circuit integrated board is used for supplying power to a user, the refrigerating unit and the double-effect refrigerating unit.
The refrigeration system based on gas-electricity complementation, wherein the refrigeration unit is connected with an external power supply, and when the electricity price is in a valley period, the refrigeration unit is powered by the external power supply.
Has the advantages that: compared with the prior art, the invention provides a refrigerating system based on gas-electricity complementation, which comprises a gas internal combustion engine, a circuit unit, a double-effect refrigerating unit and a refrigerating unit, wherein the gas internal combustion engine is respectively connected with the double-effect refrigerating unit and the circuit unit, and smoke generated by the gas internal combustion engine and cylinder sleeve water are transmitted to the double-effect refrigerating unit; the gas internal combustion engine provides energy for the circuit unit to enable the circuit unit to generate electric energy; the circuit unit is connected with the refrigerating unit and the double-effect refrigerating unit to provide electric energy for the refrigerating unit; the double-effect refrigerating unit is connected with the refrigerating unit to provide cooling water for the refrigerating unit; the refrigeration unit is used for providing a cold source for external equipment. The refrigeration system provided by the invention recycles high-temperature flue gas and high-temperature cylinder sleeve water formed by the gas internal combustion engine through the double-effect refrigeration unit, realizes coupling of gas power generation refrigeration and waste heat recovery refrigeration, realizes maximization of system cold output, and improves the utilization rate of natural gas.
Drawings
Fig. 1 is a schematic structural diagram of a refrigeration system based on gas-electricity complementation provided by the invention.
Fig. 2 is a schematic structural diagram of a double-effect refrigeration unit in a refrigeration system based on gas-electricity complementation provided by the invention.
Detailed Description
The invention provides a refrigeration system based on gas-electricity complementation, and in order to make the purpose, technical scheme and effect of the invention clearer and clearer, the invention is further described in detail by referring to the attached drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It should also be noted that the same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The invention will be further explained by the description of the embodiments with reference to the drawings.
The embodiment provides a refrigeration system based on gas-electricity complementation, as shown in fig. 1, the refrigeration system comprises a gas internal combustion engine 100, a circuit unit, a double-effect refrigeration unit 200 and a refrigeration unit; the gas combustion engine 100 is respectively connected with a circuit unit and a double-effect refrigerating unit 200, the double-effect refrigerating unit 200 and the circuit unit are both connected with the refrigerating unit, and the circuit unit is connected with the double-effect refrigerating unit 200. The gas internal combustion engine 100 generates electric energy, high-temperature flue gas and high-temperature cylinder jacket water by burning natural gas, and the electric energy is transmitted to the refrigerating unit and the double-effect refrigerating unit 200 through the circuit unit to provide electric energy for the refrigerating unit and the double-effect refrigerating unit 200; high-temperature cylinder liner water is transmitted to the double-effect refrigeration unit 200, and is cooled by the double-effect refrigeration unit 200 and then returns to the gas combustion engine 100, so that the cylinder liner water is recycled; high-temperature flue gas generated by the gas internal combustion engine 100 is transmitted to the double-effect refrigeration unit 200, and the double-effect refrigeration unit 200 absorbs heat in the high-temperature flue gas and then removes the high-temperature flue gas. Thus, a part of energy generated by combustion of natural gas is converted into electric energy, a part of the energy forms heat energy through high-temperature flue gas and high-temperature cylinder sleeve water, and the heat energy carried by the high-temperature flue gas and the heat energy carried by the high-temperature cylinder sleeve water are recycled through the double-effect refrigerating unit 200, so that the utilization rate of natural gas is improved.
In one implementation of the present embodiment, the gas internal combustion engine 100 may use methane, syngas, biogas, coal gas, and the like, in addition to natural gas. The natural gas provided in this embodiment is only an example, and other gases that can be used as the gas source of the gas internal combustion engine 100 may be used as the natural gas in this embodiment. Of course, in practical applications, the gas engine 100 may be determined according to the gas source of the gas engine 100, or the gas source may be determined according to the gas source suitable for the gas engine 100, and so on.
In one implementation manner of this embodiment, the circuit unit may include a generator 301 and a circuit board 302, the generator 301 is connected to the gas engine 100, the generator 301 is connected to the circuit board 302, the circuit board 302 is connected to the refrigeration unit, the dual-effect refrigeration unit 200 and the user side, and the electric energy is transmitted to the refrigeration unit, the dual-effect refrigeration unit 200 and the user side through the circuit board 302. The circuit integration board 302 provides electric energy for the refrigeration unit and the dual-effect refrigeration unit 200 according to the power demand of the refrigeration unit and the dual-effect refrigeration unit 200, and when the electric energy generated by the generator 301 is greater than the electric energy required by the refrigeration unit and the dual-effect refrigeration unit 200, the surplus electric energy can be supplied to the user side, so that the waste of the surplus electric energy is avoided, and the utilization rate of the electric energy can be improved. In an implementation manner of this embodiment, the user terminal may be a user terminal power grid bus, and the circuit integration board 302 is connected to the user terminal power grid bus to transmit the electric energy to the power grid.
In one implementation manner of the embodiment, the refrigeration unit is connected with the external power source, so that the external power source and the circuit unit serve as two energy supply ends of the refrigeration unit, and the energy supply end adopted by the refrigeration unit is determined based on the cost of the electric energy provided by the two energy supply ends, wherein the energy supply end adopted by the refrigeration unit is the energy supply end with low cost of the electric energy provided by the two energy supply ends, so that the energy supply end adopted by the refrigeration unit is determined based on the cost of the electric energy, the refrigeration cost can be reduced, and the flexibility and the economic competitiveness of the system can be increased. In one embodiment, since the cost of the electric power provided by the circuit unit is higher than the cost of the electric power provided by the external power source when the electricity price is in the valley period, the external power source can be used as the power supply terminal, and the cost of the electric power provided by the circuit unit is lower than the cost of the electric power provided by the external power source when the electricity price is in the peak period, the circuit unit can be used as the power supply terminal. In addition, in practical applications, when an external power source is used as the power supply terminal, the internal combustion engine may be controlled to stop operating.
In one implementation, the refrigeration unit includes a compressor 401, a second condenser 402, and a second evaporator 403, the compressor 401 is connected to the circuit unit, and the compressor 401, the second condenser 402, and the second evaporator 403 form a loop. The compressor 401 is connected with an external power supply and circuit integration board 302 to provide electric energy for the compressor 401 through the external power supply and circuit integration board 302; the compressor 401 is connected to the second condenser 402, the refrigerant compressed by the compressor 401 is transferred to the second condenser 402, heat exchange is performed between the refrigerant and the cooling water flowing into the second condenser 402 in the second condenser 402, and the heat-exchanged cooling water flows out of the second condenser 402; the transmission medium passing through the second condenser 402 is transmitted to the second evaporator 403 through the pressure reducing valve, and exchanges heat with the chilled water flowing into the second evaporator 403, and the chilled water after heat exchange is transmitted to the external device to provide a cold source for the external device; the transport medium flowing through the second evaporator 403 returns to the compressor 401 to form a circulation of the transport medium along the compressor 401, the second condenser 402 and the second evaporator 403 to form a loop.
In a specific implementation manner, a low-temperature low-pressure transmission medium flows into the compressor 401, the compressor 401 compresses the low-temperature low-pressure transmission medium to a high-temperature high-pressure transmission medium, and transmits the high-temperature high-pressure transmission medium to the second condenser 402, the high-temperature high-pressure transmission medium exchanges heat with cooling water flowing into the second condenser 402 in the second condenser 402, so that the temperature of the cooling water is raised to 30-40 ℃, and the high-temperature high-pressure transmission medium is converted into the low-temperature high-pressure transmission medium through the second condenser 402; the low-temperature high-pressure transmission medium is converted into a low-temperature low-pressure transmission medium through a pressure reducing valve 404; the low-temperature and low-pressure transmission medium exchanges heat with the chilled water flowing into the second evaporator 403 in the second evaporator 403, absorbs heat in the chilled water, and transmits the heat to the compressor 401. In this embodiment, the temperature of the chilled water flowing into the second evaporator 403 may be 14 degrees celsius, and may be reduced to 7 degrees celsius after passing through the second evaporator 403.
In one implementation of the present embodiment, as shown in fig. 2, the dual effect refrigeration unit 200 includes a high pressure generation unit, a low pressure generation unit, an absorber 203, a first condenser 206 and a first evaporator 207; the absorber 203 is respectively connected with the high pressure generation unit and the low pressure generation unit, the high pressure generation unit is connected with the low pressure generation unit, and the first condenser 206, the first evaporator 207 and the absorber 203 are sequentially connected; the absorber 203, the high pressure generation unit, and the low pressure generation unit form a first circulation circuit, and the absorber 203, the high pressure generation unit, the low pressure generation unit, the first condenser 206, and the first evaporator 207 form a second circulation circuit. The high-pressure generating unit is connected with a smoke outlet of the gas internal combustion engine 100, the low-pressure generating unit and a sleeve cylinder of the gas internal combustion engine 100 form a heat exchange loop, so that high-temperature smoke formed by the gas internal combustion engine 100 provides a heat source for the high-pressure generating unit, high-temperature sleeve water formed by a sleeve cylinder provides a heat source for the low-pressure generating unit, double recovery of waste heat generated by the gas internal combustion engine 100 is realized, and the utilization rate of natural gas can be improved.
In one implementation of the present embodiment, as shown in fig. 2, the high pressure generating unit includes a high pressure generator 201 and a high temperature heat exchanger 202; the low pressure generating unit includes a low pressure generator 204 and a low temperature heat exchanger 205. The high-temperature heat exchanger 202 is respectively connected with the absorber 203, the high-pressure generator 201 and the low-pressure generator 204, a circulating medium flowing out of the absorber 203 is preheated by the high-temperature heat exchanger 202 and then flows into the high-pressure generator 201, the high-pressure generator 201 analyzes the circulating medium, and the analyzed circulating medium flows back to the high-temperature heat exchanger 202 and flows into the low-pressure generator 204 through the high-temperature heat exchanger 202; the high pressure generator 201 is connected to the low pressure generator 204, and superheated refrigerant vapor obtained by the high pressure generator 201 analyzing the circulating medium flows into the low pressure generator 204. The low-temperature heat exchanger 205 is connected with the low-pressure generator 204 and the absorber 203 respectively, and the low-pressure generator 204 is connected with the first condenser 206; the circulating medium flowing out of the absorber 203 is preheated by the low-temperature heat exchanger 205 and then flows into the low-pressure generator 204, the low-pressure generator 204 analyzes the circulating medium flowing in the low-temperature heat exchanger 205 and the high-temperature heat exchanger 202, and the analyzed circulating medium flows back to the low-temperature heat exchanger 205 and flows back to the absorber 203 through the low-temperature heat exchanger 205; the superheated refrigerant vapor obtained by analyzing the circulating medium flowing into the low-temperature heat exchanger 205 and the high-temperature heat exchanger 202 by the low-pressure generator 204 and the superheated refrigerant vapor flowing into the high-pressure generator 201 flow into the first condenser 206.
The absorber 203 is respectively connected with the low-temperature heat exchanger 205 and the high-temperature heat exchanger 202, part of the circulating liquid flowing out of the absorber 203 flows into the low-temperature heat exchanger 205, and part of the circulating liquid flows into the high-temperature heat exchanger 202, wherein the circulating medium flowing into the high-temperature heat exchanger 202 is preheated by the high-temperature heat exchanger 202 and then flows into the high-pressure generator 201, the circulating medium is analyzed by the high-pressure generator 201, and when the circulating medium is analyzed by the high-pressure generator 201, the high-temperature flue gas flowing into the high-pressure generator 201 provides a heat source for the high-pressure generator 201, namely the high-temperature; the circulating medium flowing into the low-temperature heat exchanger 205 is preheated by the low-temperature heat exchanger 205, then flows into the low-pressure generator 204, is analyzed by the low-pressure generator 204, and when the circulating medium is analyzed by the low-pressure generator 204, the high-temperature cylinder liner water flowing into the low-pressure generator 204 provides a heat source for the low-pressure generator 204, namely the high-temperature cylinder liner water is used for heating the low-pressure generator 204.
In the present embodiment, the high pressure generator 201 obtains the first circulation medium and the superheated refrigerant vapor by analyzing the circulating medium flowing in; the low pressure generator 204 analyzes the circulating medium flowing in to obtain a second circulating medium and superheated refrigerant vapor, wherein the concentrations of the circulating mediums flowing into the high pressure generator 201 and the low pressure generator 204 are the same, the concentration of the first circulating medium flowing into the high pressure generator 201 is smaller than that of the circulating medium flowing out of the high pressure generator 201, the concentration of the second circulating medium flowing into the low pressure generator 204 is smaller than that of the circulating medium flowing out of the low pressure generator 204, and the concentration of the first circulating medium flowing out of the high pressure generator 201 is lower than that of the second circulating medium flowing out of the low pressure generator 204. In one specific implementation, the circulating medium, the first circulating medium, and the second circulating medium are all lithium bromide solutions.
The first circulating medium flowing out of the high pressure generator 201 flows into the high temperature heat exchanger 202, and flows into the low pressure generator 204 through the high temperature heat exchanger 202 and the pressure reducing valve, and the first circulating medium is further analyzed by the low pressure generator 204 to obtain a second circulating medium; superheated refrigerant vapor flowing from the high pressure generator 201 flows through the low pressure generator 204 into the second condenser 402. The second circulating medium flowing out of the low-pressure generator 204 flows back to the absorber 203 through the low-temperature heat exchanger 205, and is diluted by the absorber 203; the superheated refrigerant vapor formed by the low-pressure generator 204 and the superheated refrigerant vapor flowing into the low-pressure generator 204 from the high-pressure generator 201 flow into the first condenser 206 and are condensed in the first condenser 206. In the present embodiment, the concentration of the lithium bromide solution flowing out of the absorber 203 is less than the concentration of the lithium bromide solution flowing in the absorber 203.
The superheated refrigerant vapor flowing into the first condenser 206 is condensed in the first condenser 206, and the heat released by the condensation is absorbed by the cooling water flowing into the first condenser 206, so that the cooling water flowing into the first condenser 206 is heated and then flows out. In other words, the cooling water flowing into the first condenser 206 is heated by the heat released from the condensing process of the superheated refrigerant vapor, and the heated cooling water flows into the first condenser 206, i.e., the temperature of the cooling water flowing out of the first condenser 206 is higher than the temperature of the cooling water flowing in the first condenser 206. In one specific implementation, the cooling water flowing in the first condenser 206 is normal temperature water, and the temperature of the cooling water flowing out of the first condenser 206 is within 30-40 ℃.
The condensed water of the superheated refrigerant vapor condensed in the first condenser 206 flows into the first evaporator 207 through the pressure reducing valve, the first evaporator 207 exchanges heat with the chilled water flowing into the first evaporator 207, the condensed water after heat exchange is converted into water vapor, and the water vapor flows into the absorber 203 to dilute the second circulating medium flowing into the absorber 203 through the water vapor, so as to obtain the circulating medium flowing out of the absorber 203. In addition, in the first evaporator 207, the heat of the chilled water diluted by the condensed water is converted into water vapor, and the chilled water releases the heat to lower the temperature, so that the chilled water flowing into the first evaporator 207 is cooled, and a cooling source can be provided for external equipment through the first evaporator 207. In a specific implementation manner of this embodiment, the temperature of the chilled water flowing in the first evaporator 207 may be 14 degrees celsius, and the temperature of the chilled water flowing out of the first evaporator 207 may be 7 degrees celsius to 14 degrees celsius. In one specific implementation, the chilled water from the first evaporator 207 is supplied to the second evaporator 403 in the refrigeration unit, so as to realize the integration of the chilled water delivery pipeline, and finally the cold energy produced by the second evaporator 403 in the refrigeration unit is supplied to hotel users, small industrial parks and the like.
The double-effect refrigeration unit 200 absorbs heat provided by high-temperature flue gas and high-temperature cylinder jacket water, transfers the heat provided by the high-temperature flue gas and the high-temperature cylinder jacket water to superheated refrigerant steam through a circulation loop formed by the high-pressure generator 201, the low-pressure generator 204, the high-temperature heat exchanger 202 and the low-temperature heat exchanger 205, heats cooling water flowing into the first condenser 206 through the hot refrigerant steam, cools chilled water flowing into the first evaporator 207 through condensed water in the flow path of the first condenser 206, and improves the utilization rate of energy; and the water vapor flowing out of the first evaporator 207 flows into the absorber 203 for diluting the second circulating medium flowing into the absorber 203, thereby realizing a concentration change cycle of the circulating medium.
In summary, the present embodiment provides a refrigeration system based on gas-electricity complementation, where the system includes a gas internal combustion engine, a circuit unit, a double-effect refrigeration unit and a refrigeration unit, the gas internal combustion engine is connected to the double-effect refrigeration unit and the circuit unit, and flue gas and cylinder liner water generated by the gas internal combustion engine are transmitted to the double-effect refrigeration unit; the gas internal combustion engine provides energy for the circuit unit to enable the circuit unit to generate electric energy; the circuit unit is connected with the refrigerating unit and the double-effect refrigerating unit; the double-effect refrigerating unit is connected with the refrigerating unit. The refrigeration system provided by the invention recycles high-temperature flue gas and high-temperature cylinder sleeve water formed by the gas internal combustion engine through the double-effect refrigeration unit, realizes coupling of gas power generation refrigeration and waste heat recovery refrigeration, realizes maximization of system cold output, and improves the utilization rate of natural gas.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
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| CN202011423645.8A CN112503797A (en) | 2020-12-08 | 2020-12-08 | Refrigerating system based on gas-electricity complementation |
| PCT/CN2021/122692 WO2022121484A1 (en) | 2020-12-08 | 2021-10-08 | Refrigeration system based on gas-electricity complementation |
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| CN202011423645.8A CN112503797A (en) | 2020-12-08 | 2020-12-08 | Refrigerating system based on gas-electricity complementation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113865144A (en) * | 2021-08-23 | 2021-12-31 | 深圳市燃气集团股份有限公司 | Zero-carbon-emission refrigeration system |
| WO2022121484A1 (en) * | 2020-12-08 | 2022-06-16 | 深圳市燃气集团股份有限公司 | Refrigeration system based on gas-electricity complementation |
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