WO2022121484A1

WO2022121484A1 - Refrigeration system based on gas-electricity complementation

Info

Publication number: WO2022121484A1
Application number: PCT/CN2021/122692
Authority: WO
Inventors: 范峻铭; 蒋鹏; 孟伟; 杨光; 刘建辉; 李璐伶; 钟昶; 姜红星; 余健亭; 乔亮
Original assignee: 深圳市燃气集团股份有限公司; 深圳市深燃燃气技术研究院
Priority date: 2020-12-08
Filing date: 2021-10-08
Publication date: 2022-06-16
Also published as: CN112503797A

Abstract

A refrigeration system based on gas-electricity complementation, comprising a gas internal combustion engine (100), a circuit unit, a double-effect refrigeration unit (200), and a refrigeration unit. The gas internal combustion engine (100) is connected to the double-effect refrigeration unit (200) and the circuit unit, separately, and flue gas generated by the gas internal combustion engine (100) and jacket water are transmitted to the double-effect refrigeration unit (200); the gas internal combustion engine (100) provides energy for the circuit unit to make the circuit unit generate electrical energy; the circuit unit is connected to the refrigeration unit and the double-effect refrigeration unit (200); and the double-effect refrigeration unit (200) is connected to the refrigeration unit. According to the refrigeration system, high-temperature flue gas formed by the gas internal combustion engine and high-temperature jacket water are recycled by means of the double-effect refrigeration unit (200), so that the coupling between gas power generation refrigeration and waste heat recovery refrigeration is achieved, cold output of the system is maximized, and the utilization ratio of natural gas is improved.

Description

A refrigeration system based on gas and electricity complementation

technical field

The invention relates to the technical field of natural gas, in particular to a refrigeration system based on gas-electricity complementation.

Background technique

With the increasingly prominent problems of global warming, energy crisis and environmental pollution, there is an urgent need to implement energy-saving and environmental protection technologies. Accelerating the development of efficient utilization of clean energy at the end of users is an important way to promote coordinated and stable development and build a clean, low-carbon, safe and efficient modern energy system.

In this context, in view of the natural climate characteristics in southern my country, it is of great significance to develop a complementary energy supply and efficient cooling technology based on natural gas and supplemented by electricity to meet the energy needs of hotel users and small industrial park users. 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 into the outdoor environment through the radiator, resulting in a low utilization rate of the primary energy of the system during the cooling process of the gas engine heat pump.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a refrigeration system based on gas and electricity complementation in view of the deficiencies of the prior art.

In order to solve the above-mentioned technical problems, the technical scheme adopted in the present invention is as follows:

A refrigeration system based on gas-electricity complementarity, 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 with the double-effect refrigeration unit and the circuit unit, and the The flue gas and cylinder jacket water generated by the gas-fired internal combustion engine are transmitted to the double-effect refrigeration unit; the gas-fired internal combustion engine provides energy for the circuit unit to make the circuit unit generate electricity; the circuit unit, the refrigeration unit and the double-effect refrigeration unit units are connected; the double-effect refrigeration unit is connected with the refrigeration unit.

The refrigeration system based on gas-electricity complementarity, wherein the double-effect refrigeration unit includes a high-pressure generating unit, a low-pressure generating unit, an absorber, a first condenser and a first evaporator; the absorber and the high-pressure generating unit are respectively unit and the low pressure generating unit are connected, the high pressure generating unit is connected with the low pressure generating unit, the first condenser, the first evaporator and the absorber are connected in sequence; the absorber, the high pressure generating unit and the The low pressure generating unit forms a first circulation loop, and the absorber, the high pressure generating unit, the low pressure generating unit, the first condenser and the first evaporator form a second circulation loop.

In the refrigeration system based on gas-electricity complementarity, the high-pressure generating unit is connected with the flue gas outlet of the gas-fired internal combustion engine, and the low-pressure generating unit and the casing of the gas-fired internal combustion engine form a heat exchange circuit.

In the refrigeration system based on gas-electricity complementarity, the circulating medium of the first circulation loop is a lithium bromide solution.

In the refrigeration system based on gas-electricity complementarity, the concentration of the lithium bromide solution flowing out of the absorber is smaller than the concentration of the lithium bromide solution flowing into the absorber.

The refrigeration system based on gas-electricity complementarity, wherein the refrigeration unit includes a compressor, a second condenser and a second evaporator, the compressor is connected to the circuit unit, the compressor, the second condenser and The second evaporator forms a loop, the second evaporator is connected with the double-effect refrigeration unit, and provides a cold source for external equipment.

In the refrigeration system based on gas-electric complementarity, the refrigeration unit further includes a pressure reducing valve, and the pressure reducing valve is located between the condenser and the evaporator.

In the refrigeration system based on gas-electricity complementarity, the circuit unit includes a generator and a circuit integrated board connected in sequence, the generator is connected with a gas-fired internal combustion engine, and the circuit integrated board is connected with the refrigeration unit and the circuit integrated board. The double-effect refrigeration unit is connected, and the circuit integrated board is used for supplying power to the user, the refrigeration unit and the double-effect refrigeration unit.

In the refrigeration system based on gas-electricity complementarity, the refrigeration unit is connected to an external power source, and when the electricity price is in a trough period, the refrigeration unit is powered by the external power source.

Beneficial effects: Compared with the prior art, the present invention provides a refrigeration system based on gas-electricity complementarity, 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 and the The double-effect refrigeration unit and the circuit unit are connected, and the flue gas and cylinder jacket water generated by the gas-fired internal combustion engine are transmitted to the double-effect refrigeration unit; the gas-fired internal combustion engine provides energy for the circuit unit to make the circuit unit generate electricity; so The circuit unit is connected to the refrigeration unit and the double-effect refrigeration unit to provide electrical energy for the refrigeration unit; the double-effect refrigeration unit is connected to the refrigeration unit to provide cooling water for the refrigeration unit; the Refrigeration units are used to provide cold sources for external equipment. The refrigeration system provided by the invention recycles 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 of drawings

FIG. 1 is a schematic structural diagram of a refrigeration system based on gas-electricity complementation provided by the present invention.

FIG. 2 is a schematic structural diagram of a double-effect refrigeration unit in the refrigeration system based on gas-electricity complementation provided by the present invention.

Detailed ways

The present invention provides a refrigeration system based on gas-electricity complementation. In order to make the purpose, technical solution and effect of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or 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 the terms "upper", "lower", "lower" The orientation or positional relationship indicated by "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific Therefore, the terms describing the positional relationship in the accompanying drawings are only used for exemplary illustration and should not be construed as a limitation on this patent. For those of ordinary skill in the art, the Understand the specific meaning of the above terms.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first", "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

In the following, the content of the invention will be further illustrated by describing the embodiments in conjunction with the accompanying drawings.

This embodiment provides a refrigeration system based on gas and electricity complementation. As shown in FIG. 1 , the refrigeration system includes a gas internal combustion engine 100, a circuit unit, a double-effect refrigeration unit 200 and a refrigeration unit; the gas internal combustion engine 100 is connected to the circuit The unit and the double-effect refrigeration unit 200 are connected, the double-effect refrigeration unit 200 and the circuit unit are both connected to the refrigeration unit, and the circuit unit is connected to the double-effect refrigeration unit 200 . The gas-fired internal combustion engine 100 generates electric energy, high-temperature flue gas and high-temperature liner water by burning natural gas, and the electric energy is transmitted to the refrigeration unit and the double-effect refrigeration unit 200 through the circuit unit to provide electric energy for the refrigeration unit and the double-effect refrigeration unit 200; the high-temperature liner water transmits To the double-effect refrigeration unit 200, after cooling through the double-effect refrigeration unit 200, it is looped to the gas-fired internal combustion engine 100 to realize the recycling of the cylinder jacket water; The 200 absorbs the heat in the high-temperature flue gas and removes the high-temperature flue gas. In this way, part of the energy generated by the combustion of natural gas is converted into electrical energy, and part of it is converted into heat energy through the high-temperature flue gas and the high-temperature cylinder jacket water, and the double-effect refrigeration unit 200 recycles the thermal energy carried by the high-temperature flue gas and the thermal energy carried by the high-temperature cylinder jacket water. , thereby improving the utilization rate of hot air.

In an implementation manner of this embodiment, the gas-fired internal combustion engine 100 can use not only natural hot gas, but also biogas, synthesis gas, biogas, and coal-to-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-fired internal combustion engine 100 can be used to replace the natural gas in this embodiment. Of course, in practical applications, the gas internal combustion engine 100 may be determined according to the gas source used as the gas internal combustion engine 100 , or the gas source may be determined according to the gas source suitable for the gas internal combustion engine 100 , and the like.

In an implementation of this embodiment, the circuit unit may include a generator 301 and a circuit integrated board 302, the generator 301 is connected to the gas internal combustion engine 100, the generator 301 is connected to the circuit integrated board 302, and the circuit integrated The board 302 is connected with the refrigeration unit, the double-effect refrigeration unit 200 and the user terminal, and the electrical energy is transmitted to the refrigeration unit, the double-effect refrigeration unit 200 and the user terminal through the circuit integrated board 302 . The circuit integrated board 302 provides electrical energy for the refrigeration unit and the double-effect refrigeration unit 200 according to the electricity demand of the refrigeration unit and the double-effect refrigeration unit 200, and when the electric energy generated by the generator 301 is greater than that required by the refrigeration unit and the double-effect refrigeration unit 200 When the electric energy is generated, the surplus electric energy can be supplied to the user end to avoid waste of excess electric energy, thereby improving the utilization rate of electric energy. In an implementation manner of this embodiment, the user end may be a user end grid bus, and the circuit integrated board 302 is connected to the user end grid bus to transmit electric energy to the grid.

In an implementation of this embodiment, the refrigeration unit is connected to an external power supply, so that the external power supply and the circuit unit serve as two energy supply terminals of the refrigeration unit, and the determination is based on the cost of the electric energy provided by the two energy supply terminals The energy supply end used by the refrigeration unit, wherein the energy supply end used by the refrigeration unit is the energy supply end with the low cost of the electric energy provided by the two energy supply ends, so that the energy supply end used by the refrigeration unit is determined based on the cost of the electric energy. It can reduce the cooling cost and increase the flexibility and economic competitiveness of the system. In a specific implementation manner, since the cost of the electric energy provided by the circuit unit is higher than the cost of the electric energy provided by the external power supply when the electricity price is in the trough period, the external power supply can be used as the energy supply terminal. When the electricity price is in the peak period, the circuit unit The cost of the provided electric energy is lower than that of the electric energy provided by the external power supply, so that the circuit unit can be used as the energy supply terminal. In addition, in practical applications, when an external power source is used as the energy supply terminal, the internal combustion engine can be controlled to stop working.

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, the compressor 401, the second condenser 402 and The second evaporator 403 forms a circuit. The compressor 401 is connected with the external power supply and the circuit integrated board 302 to provide power for the compressor 401 through the external power supply and the circuit integrated board 302; the compressor 401 is connected with the second condenser 402, and the transmission medium compressed by the compressor 401 is passed Transferred to the second condenser 402, in the second condenser 402, it exchanges heat with the cooling water flowing into the second condenser 402, and the cooling water after heat exchange flows out of the second condenser 402; transmission through the second condenser 402 The medium is transmitted to the second evaporator 403 through the pressure reducing valve, and conducts heat exchange with the chilled water flowing into the second evaporator 403, and the chilled water after heat exchange is transported to an external device to provide a cold source for the external device; The transmission medium of 403 is returned to the compressor 401 to form a circulation of the transmission medium forming a loop along the compressor 401 , the second condenser 402 and the second evaporator 403 .

In a specific implementation, the low temperature and low pressure transmission medium flows into the compressor 401. The compressor 401 compresses the low temperature and low pressure transmission medium to the high temperature and high pressure transmission medium, and transmits the high temperature and high pressure transmission medium to the second condenser 402, and the high temperature and high pressure transmission medium The medium exchanges heat with the cooling water flowing into the second condenser 402 in the second condenser 402, so that the cooling water is heated to 30-40 degrees Celsius, and the high-temperature and high-pressure transmission medium passes through the second condenser 402 and is converted into a low-temperature and high-pressure transmission medium; The low-temperature and high-pressure transmission medium is converted into a low-temperature and low-pressure transmission medium through the 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 the heat in the chilled water and transmits it to the second evaporator 403. 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 an implementation of this embodiment, as shown in FIG. 2 , the double-effect refrigeration unit 200 includes a high-pressure generating unit, a low-pressure generating unit, an absorber 203, a first condenser 206, and a first evaporator 207; the The absorber 203 is respectively connected with the high pressure generating unit and the low pressure generating unit, the high pressure generating unit is connected with the low pressure generating unit, the first condenser 206 , the first evaporator 207 and the absorber 203 Connected in sequence; the absorber 203, the high pressure generating unit and the low pressure generating unit form a first circulation loop, and the absorber 203, the high pressure generating unit, the low pressure generating unit, the first condenser 206 and the first evaporator 207 form the second circulation loop circular loop. The high-pressure generating unit is connected to the flue gas outlet of the gas-fired internal combustion engine 100, and the low-pressure generating unit forms a heat exchange circuit with the casing of the gas-fired internal combustion engine 100, so that the high-temperature flue gas formed by the gas-fired internal combustion engine 100 is a high-pressure generating unit The heat source is increased, and the high-temperature cylinder liner water formed by the cylinder liner provides a heat source for the low-pressure generating unit, and realizes double recovery of the waste heat generated by the gas-fired internal combustion engine 100, thereby improving the utilization rate of natural gas.

In an implementation of this 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. The 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. 201 analyzes the circulating medium, and the analyzed circulating medium returns 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 the high pressure The superheated refrigerant vapor obtained by analyzing the circulating medium by the generator 201 flows into the low-pressure generator 204 . The low temperature heat exchanger 205 is respectively connected with the low pressure generator 204 and the absorber 203, 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 and the low pressure generator 204 analyze the circulating medium flowing into the low temperature heat exchanger 205 and the high temperature heat exchanger 202, and the analyzed circulating medium returns to the low temperature heat exchanger 205, and returns to the low temperature heat exchanger 205 to the low temperature heat exchanger 205. The absorber 203 ; the low pressure generator 204 , 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 , and the superheated refrigerant vapor flowing into the high pressure generator 201 flow into the first condenser 206 .

The absorber 203 is connected to the low temperature heat exchanger 205 and the high temperature heat exchanger 202 respectively, and the circulating liquid flowing out of the absorber 203 partially flows into the low temperature heat exchanger 205, and part flows into the high temperature heat exchanger 202, wherein the circulating liquid flows into the high temperature heat exchanger 202 The circulating medium is preheated by the high temperature heat exchanger 202 and then flows into the high pressure generator 201, and is analyzed by the high pressure generator 201, and when the high pressure generator 201 analyzes the circulating medium, the high temperature flue gas flowing into the high pressure generator 201 is high pressure The generator 201 provides a heat source, that is, the high-temperature flue gas is used to heat the high-pressure generator 201; the circulating medium flowing into the low-temperature heat exchanger 205 flows into the low-pressure generator 204 after being preheated by the low-temperature heat exchanger 205, and is analyzed by the low-pressure generator 204 , and when the low pressure generator 204 analyzes the circulating medium, the high temperature cylinder jacket water flowing into the low pressure generator 204 provides a heat source for the low pressure generator 204 , that is, the high temperature cylinder jacket water is used to heat the low pressure generator 204 .

In this embodiment, the high-pressure generator 201 obtains the first circulating medium and the superheated refrigerant vapor by analyzing the inflowing circulating medium; the low-pressure generator 204 obtains the second circulating medium and the superheated refrigerant vapor by analyzing the flowing circulating medium The refrigerant vapor, wherein the concentration of the circulating medium flowing into the high-pressure generator 201 and the low-pressure generator 204 is the same, the concentration of the first circulating medium flowing into the high-pressure generator 201 is smaller than the concentration of the circulating medium flowing out of the high-pressure generator 201, and the low-pressure generating The concentration of the second circulating medium from the generator 204 is lower than that of the circulating medium from the low pressure generator 204 , and the concentration of the first circulating medium from the high pressure generator 201 is lower than the concentration of the second circulating medium from the low pressure generator 204 . In a specific implementation manner, 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 The second circulating medium; the superheated refrigerant vapor flowing out of the high pressure generator 201 flows into the second condenser 402 through the low pressure generator 204 . 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 the second circulating medium is diluted by the absorber 203; the superheated refrigerant vapor formed by the low-pressure generator 204 and the high-pressure generator 201 flow in The superheated refrigerant vapor from the low pressure generator 204 flows into the first condenser 206 and is condensed in the first condenser 206 . In this embodiment, the concentration of the lithium bromide solution flowing out of the absorber 203 is lower than the concentration of the lithium bromide solution flowing into 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 by the condensation process of the superheated refrigerant vapor, and the heated cooling water flows into the first condenser 206 , that is, the temperature of the cooling water flowing out of the first condenser 206 higher than the temperature of the cooling water flowing into the first condenser 206 . In a specific implementation manner, the cooling water flowing into the first condenser 206 is normal temperature water, and the temperature of the cooling water flowing out of the first condenser 206 is contained within 30 degrees Celsius to 40 degrees Celsius.

The condensed water after the superheated refrigerant vapor is condensed in the first condenser 206 flows into the first evaporator 207 through the pressure reducing valve, and the first evaporator 207 exchanges heat with the chilled water flowing into the first evaporator 207, The condensed water 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 by 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 condensed water diluting the chilled water is converted into water vapor, and the chilled water releases heat to reduce the temperature, so as to obtain the chilled water flowing into the first evaporator 207 to cool down, so as to pass through the first evaporator 207 A cold source can be provided for external equipment. In a specific implementation of this embodiment, the temperature of the chilled water flowing into 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 between 7 degrees Celsius and 14 degrees Celsius. In a specific implementation, the chilled water flowing out of the first evaporator 207 is supplied to the second evaporator 403 in the refrigeration unit 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 Hotel users and small industrial parks, etc.

The double-effect refrigeration unit 200 absorbs the heat provided by the high-temperature flue gas and the high-temperature cylinder jacket water, and cools the high temperature through the 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. The heat provided by the flue gas and the high-temperature cylinder jacket water is transferred to the superheated refrigerant vapor, and the cooling water flowing into the first condenser 206 is heated by the hot refrigerant vapor. The chilled water in the first evaporator 207 is cooled to improve 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, realizing the circulation medium. Concentration change cycle.

To sum up, this embodiment provides a refrigeration system based on gas-electricity complementarity. 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 is connected, and the flue gas and cylinder jacket water generated by the gas-fired internal combustion engine are transmitted to the double-effect refrigeration unit; the gas-fired internal combustion engine provides energy for the circuit unit to make the circuit unit generate electricity; the circuit unit is connected to The refrigeration unit and the double-effect refrigeration unit are connected; the double-effect refrigeration unit is connected with the refrigeration unit. The refrigeration system provided by the invention recycles 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 .

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

A refrigeration system based on gas-electricity complementarity, characterized in that the system includes a gas-fired internal combustion engine, a circuit unit, a double-effect refrigeration unit and a refrigeration unit, and the gas-fired internal combustion engine is respectively in phase with 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 electricity; the circuit unit is connected to 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 based on gas-electricity complementarity according to claim 1, wherein the double-effect refrigeration unit comprises a high-pressure generating unit, a low-pressure generating unit, an absorber, a first condenser and a first evaporator; the absorber are respectively connected with the high pressure generating unit and the low pressure generating unit, the high pressure generating unit is connected with the low pressure generating unit, the first condenser, the first evaporator and the absorber are connected in sequence; the absorption The absorber, the high pressure generating unit and the low pressure generating unit form a first circulation loop, and the absorber, the high pressure generating unit, the low pressure generating unit, the first condenser and the first evaporator form a second circulation loop.
The refrigeration system based on gas-electricity complementarity according to claim 2, wherein the high-pressure generating unit is connected to the flue gas outlet of the gas-fired internal combustion engine, and the low-pressure generating unit and the casing of the gas-fired internal combustion engine form a heat exchange circuit .
The refrigeration system based on gas-electricity complementarity according to claim 2, wherein the circulating medium of the first circulation loop is a lithium bromide solution.
The refrigeration system based on gas-electricity complementarity according to claim 4, wherein the concentration of the lithium bromide solution flowing out of the absorber is lower than the concentration of the lithium bromide solution flowing into the absorber.
The refrigeration system based on complementary gas and electricity according to claim 1, wherein the refrigeration unit comprises a compressor, a second condenser and a second evaporator, the compressor is connected to the circuit unit, and the compressor , the second condenser and the second evaporator form a loop, and the second evaporator is connected with the double-effect refrigeration unit and provides a cold source for external equipment.
The refrigeration system based on complementary gas and electricity according to claim 6, wherein the refrigeration unit further comprises a pressure reducing valve, and the pressure reducing valve is located between the condenser and the evaporator.
The refrigeration system based on gas-electricity complementarity according to claim 1, wherein the circuit unit comprises a generator and a circuit integrated board which are connected in sequence, the generator is connected to the gas internal combustion engine, and the circuit integrated board is connected to the integrated circuit board. The refrigerating unit and the double-effect refrigerating unit are connected, and the circuit integrated board is used to supply power to the user, the refrigerating unit and the double-effect refrigerating unit.
The refrigeration system based on gas-electricity complementarity according to claim 1 or 8, wherein the refrigeration unit is connected to an external power source, and when the electricity price is in a trough period, the refrigeration unit is powered by the external power source.