CN110118305B - Residual pressure comprehensive utilization system of natural gas pressure regulating station - Google Patents
Residual pressure comprehensive utilization system of natural gas pressure regulating station Download PDFInfo
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- CN110118305B CN110118305B CN201910486649.1A CN201910486649A CN110118305B CN 110118305 B CN110118305 B CN 110118305B CN 201910486649 A CN201910486649 A CN 201910486649A CN 110118305 B CN110118305 B CN 110118305B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 414
- 239000003345 natural gas Substances 0.000 title claims abstract description 207
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 130
- 238000005057 refrigeration Methods 0.000 claims abstract description 111
- 230000001502 supplementing effect Effects 0.000 claims abstract description 30
- 238000010248 power generation Methods 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims description 187
- 239000007789 gas Substances 0.000 claims description 170
- 239000003507 refrigerant Substances 0.000 claims description 62
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- 238000009825 accumulation Methods 0.000 claims description 29
- 238000001816 cooling Methods 0.000 claims description 29
- 238000011144 upstream manufacturing Methods 0.000 claims description 25
- 239000002826 coolant Substances 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 230000033228 biological regulation Effects 0.000 abstract description 20
- 230000007363 regulatory process Effects 0.000 abstract description 9
- 238000007710 freezing Methods 0.000 description 11
- 230000008014 freezing Effects 0.000 description 11
- 239000011232 storage material Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 230000008020 evaporation Effects 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D13/00—Stationary devices, e.g. cold-rooms
-
- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D23/00—General constructional features
- F25D23/003—General constructional features for cooling refrigerating machinery
-
- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/005—Mounting of control devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The application relates to the technical field of natural gas pressure regulation, in particular to a residual pressure comprehensive utilization system of a natural gas pressure regulating station. The application provides a natural gas pressure regulating station residual pressure comprehensive utilization system, include: the natural gas pressure regulating device, the power generation device and the refrigeration house refrigerating device; the natural gas pressure regulating device comprises a prime motor, a first condenser and a temperature regulator; the power generation device comprises a generator, the prime motor is coaxially connected with the generator, and the generator is connected with an external power grid; the refrigeration device of the refrigeration house comprises a first compressor, a first throttle valve, a refrigeration house warehouse and a refrigeration house supplementing refrigeration device; the refrigerator is characterized in that a first evaporator and a second evaporator are arranged in the refrigerator. The natural gas pressure regulating station residual pressure comprehensive utilization system can utilize the pressure difference generated in the natural gas pressure regulating process to generate power, and also utilizes residual cold generated in the natural gas pressure regulating process to cool a refrigeration house.
Description
Technical Field
The application relates to the technical field of natural gas pressure regulation, in particular to a residual pressure comprehensive utilization system of a natural gas pressure regulating station.
Background
The gas transmission pressure of the high-pressure natural gas pipe network in China reaches 6.4-10 Mpa, and the national regulations state that the pressure is 0.4Mpa when natural gas is transmitted to town users. Therefore, natural gas is conveyed from a high-pressure pipe network to a low-pressure pipe network, and pressure regulation is needed for a plurality of times, so that the pressure difference between the high-pressure pipe network and the low-pressure pipe network is huge. At present, most of natural gas pressure regulating stations in China are regulated by pressure regulating skids, a great amount of pressure energy is lost, and the temperature of the natural gas is rapidly reduced along with the pressure reduction after the natural gas is regulated. In order to maintain the normal transportation of natural gas in the pipeline and prevent the low-temperature damage of the pipeline and equipment caused by the natural gas with too low temperature and the ice blockage of the valve, the natural gas after pressure regulation needs to be heated by an external heat source so that the temperature of the natural gas reaches a certain height. While external heating requires additional energy from the outside. Therefore, an improvement is needed in the pressure regulating mode of the conventional natural gas pressure regulating station.
As the age has shifted, more and more offshore natural gas has been explored and the trend of natural gas transportation from coastal to inland has become more and more apparent. Natural gas pressure regulating stations built in coastal areas are mostly in hot and humid climatic environments, so that the requirements of people and equipment on air conditioning are increasing.
Most of the existing natural gas pressure energy utilization methods are single pressure energy power generation. The pressure energy generation uses only mechanical work of the pressure energy and does not use cold energy generated thereby. Therefore, the existing natural gas pressure energy utilization device has the common problem that the pressure energy is not fully utilized, so that energy is wasted.
Disclosure of Invention
The invention aims to solve the technical problem that the pressure energy of a natural gas pressure regulating station is not fully utilized in the prior art, and provides a comprehensive utilization system for the residual pressure of the natural gas pressure regulating station, which can utilize a large amount of wasted pressure energy during the pressure regulation of the natural gas pressure regulating station, generate power by the wasted pressure energy during the pressure regulation of the natural gas, and is used for refrigeration of a refrigeration house and refrigeration of an air conditioner, thereby improving the energy utilization rate of the residual pressure.
In view of this, the present application provides a natural gas pressure regulating station residual pressure comprehensive utilization system, the system includes: the natural gas pressure regulating device, the power generation device and the refrigeration house refrigerating device;
the natural gas pressure regulating device comprises a prime motor, a first condenser and a temperature regulator;
the outlet of the upstream high-pressure natural gas pipeline is connected with the air inlet of the prime motor; the gas outlet of the prime motor is connected with the gas inlet of the natural gas end of the first condenser, the gas outlet of the natural gas end of the first condenser is connected with the gas inlet of the temperature regulator, and the gas outlet of the temperature regulator is connected with the gas inlet of the downstream medium-low pressure gas pipeline;
The power generation device comprises a generator, the prime motor is coaxially connected with the generator, and the generator is connected with an external power grid;
the refrigeration device of the refrigeration house comprises a first compressor, a first throttle valve, a refrigeration house warehouse and a refrigeration house supplementing refrigeration device; a first evaporator and a second evaporator are arranged in the refrigerator warehouse;
the air outlet of the first compressor is connected with the refrigerant air inlet of the first condenser, the refrigerant liquid outlet of the first condenser is connected with the liquid inlet of the first throttle valve, the liquid outlet of the first throttle valve is connected with the liquid inlet of the first evaporator, the air outlet of the first evaporator is connected with the air inlet of the first compressor, the liquid outlet of the second throttle valve of the refrigeration house supplementing refrigerating device is connected with the liquid inlet of the second evaporator, the air outlet of the second evaporator is connected with the air inlet of the second compressor of the refrigeration house supplementing refrigerating device, and the refrigeration house supplementing refrigerating device cools the refrigeration house through the second evaporator.
Preferably, the refrigeration house supplementing refrigeration device comprises a second compressor, a second throttle valve, a second condenser, a pump A and a cooling tower A;
The gas outlet of the second compressor is connected with the refrigerant gas inlet of the second condenser, the refrigerant liquid outlet of the second condenser is connected with the liquid inlet of the second throttle valve, the liquid outlet of the second throttle valve is connected with the liquid inlet of the second evaporator, the gas outlet of the second evaporator is connected with the gas inlet of the second compressor, the liquid outlet of the cooling tower A is connected with the cooling medium liquid inlet of the second condenser, and the cooling medium liquid inlet of the second condenser is connected with the liquid inlet of the cooling tower A through the pump A.
The cooling tower (The cooling tower) is a device for absorbing heat from a system and discharging the heat to the atmosphere by using water as a circulating coolant so as to reduce the water temperature; the cold is an evaporation heat-dissipating device which utilizes the principles of heat dissipation by evaporation, convection heat transfer, radiation heat transfer and the like of heat taken away by evaporation by steam generated by cold-heat exchange after water is in flowing contact with air to dissipate waste heat generated in industry or refrigeration air conditioner so as to reduce water temperature.
Preferably, the natural gas pressure regulating station residual pressure comprehensive utilization system further comprises a cold accumulation peak regulating device, wherein the cold accumulation peak regulating device comprises a subcooler A, a pump B, a cold accumulator A and a cold accumulation heat exchanger of a cold storage; the cold accumulator A is internally filled with a cold accumulation agent;
The outlet of the upstream high-pressure natural gas pipeline is connected with the air inlet of the prime motor; the gas outlet of the prime motor is connected with the gas inlet of the natural gas end of the first condenser, the gas outlet of the natural gas end of the first condenser is connected with the gas inlet of the subcooler A, the gas outlet of the subcooler A is connected with the gas inlet of the temperature regulator, and the gas outlet of the temperature regulator is connected with the gas inlet of the downstream medium-low pressure gas pipeline; the liquid outlet of the subcooler A is connected with the liquid inlet of the cold accumulator A, the liquid outlet of the cold accumulator A is connected with the liquid inlet of the pump B, and the liquid outlet of the pump B is connected with the liquid inlet of the subcooler A; the cold storage heat exchanger of the cold storage is arranged in the cold storage device A, a first refrigerant liquid outlet of the second condenser is connected with a liquid inlet of the cold storage heat exchanger of the cold storage, and a liquid outlet of the cold storage heat exchanger of the cold storage is connected with a liquid inlet of the second throttle valve.
Preferably, the natural gas pressure regulating station residual pressure comprehensive utilization system further comprises a precooler and a high-temperature medium refrigerating device;
the outlet of the upstream high-pressure natural gas pipeline is connected with the air inlet of the prime motor; the gas outlet of the prime motor is connected with the gas inlet of the natural gas end of the first condenser, the gas outlet of the natural gas end of the first condenser is connected with the gas inlet of the natural gas end of the precooler, the gas outlet of the natural gas end of the precooler is connected with the gas inlet of the temperature regulator, and the gas outlet of the temperature regulator is connected with the gas inlet of the downstream medium-low pressure gas pipeline;
The high-temperature medium refrigerating device comprises a precooler, a high-temperature medium pipeline, a medium container and a pump C; the high-temperature medium pipeline is connected with the water inlet of the pump C, the water outlet of the pump C is connected with the water inlet of the precooler, and the water outlet of the precooler is connected with the medium container.
Further, the high-temperature medium pump further comprises a pump F and a flow regulating valve, wherein the pump F is connected with the high-temperature medium pipeline, the flow regulating valve is connected with a water inlet of the high-temperature medium pipeline, the pump F is used for pumping the high-temperature medium into the high-temperature medium pipeline, and the flow regulating valve is used for controlling the flow and the passing time of the high-temperature medium passing through the high-temperature medium pipeline.
Further, the water outlet of the medium container is also connected with a medium container water outlet pipeline and a flow regulating valve, the medium container water outlet pipeline is connected with the flow regulating valve, after the relatively high-temperature medium is subjected to heat exchange through the relatively low-temperature natural gas of the precooler, the temperature of the relatively high-temperature medium is reduced to be changed into a low-temperature medium, the low-temperature medium subjected to heat exchange through the precooler is conveyed into the medium container, the medium container water outlet pipeline can output the low-temperature medium, and the low-temperature medium has multiple purposes of cooling or cooling and the like.
Specifically, the high-temperature medium pipeline can be communicated with a temperature-adjustable medium, the medium container contains the temperature-adjustable medium, the medium can be water, the temperature-adjustable medium can be air conditioner freezing backwater, and the medium container is an air conditioner water tank; the temperature of the air conditioner freezing backwater is higher than that of the natural gas in the precooler, so that heat exchange can be carried out between the air conditioner freezing backwater and the natural gas in the precooler, heat is transferred to the natural gas in the precooler with relatively low temperature by the air conditioner freezing backwater with relatively high temperature, and finally, the temperature of the air conditioner freezing backwater with relatively high temperature is reduced, and the air conditioner freezing backwater with reduced temperature is introduced into an air conditioner water tank.
Preferably, the natural gas pressure regulating station residual pressure comprehensive utilization system further comprises a high-temperature medium supplementing and refrigerating device, wherein the high-temperature medium supplementing and refrigerating device comprises a third evaporator, a third compressor, a third throttle valve, a third condenser, a pump D and a cooling tower B;
the third evaporator is arranged in the medium container so that the third evaporator can refrigerate the medium in the medium container; the gas outlet of the third compressor is connected with the refrigerant gas inlet of the third condenser, the first refrigerant liquid outlet of the third condenser is connected with the liquid inlet of the third throttle valve, the liquid outlet of the third throttle valve is connected with the liquid inlet of the third evaporator, the gas outlet of the third evaporator is connected with the gas inlet of the third compressor, the liquid outlet of the cooling tower B is connected with the cooling medium liquid inlet of the third condenser, and the cooling medium liquid outlet of the third condenser is connected with the liquid inlet of the cooling tower B through a pump D.
Preferably, the natural gas pressure regulating station residual pressure comprehensive utilization system further comprises a cold accumulation peak regulating device, wherein the cold accumulation peak regulating device comprises a subcooler B, a pump E, a cold accumulator B and a high-temperature medium cold accumulation heat exchanger; the cold accumulator B is internally filled with a cold accumulating agent;
the outlet of the upstream high-pressure natural gas pipeline is connected with the air inlet of the prime motor; the gas outlet of the prime motor is connected with the gas inlet of the natural gas end of the first condenser, the gas outlet of the natural gas end of the first condenser is connected with the gas inlet of the subcooler B, the gas outlet of the subcooler B is connected with the gas inlet of the precooler, the gas outlet of the precooler is connected with the gas inlet of the temperature regulator, and the gas outlet of the temperature regulator is connected with the gas inlet of the downstream medium-low pressure gas pipeline; the liquid outlet of the subcooler B is connected with the liquid inlet of the cold accumulator B, the liquid outlet of the cold accumulator B is connected with the liquid inlet of the pump E, and the liquid outlet of the pump E is connected with the liquid inlet of the subcooler B; the high-temperature medium cold-storage heat exchanger is arranged in the cold accumulator B, a first refrigerant liquid outlet of the third condenser is connected with a liquid inlet of the high-temperature medium cold-storage heat exchanger, and a liquid outlet of the high-temperature medium cold-storage heat exchanger is connected with a liquid inlet of the third throttle valve.
The cold accumulation peak shaving device can independently refrigerate the refrigerant of the cold storage supplementary refrigeration device after accumulating the cold, and can independently refrigerate the refrigerant of the high-temperature medium supplementary refrigeration device after accumulating the cold, and can simultaneously refrigerate the refrigerant of the cold storage supplementary refrigeration device and the refrigerant of the high-temperature medium supplementary refrigeration device after accumulating the cold.
Preferably, the natural gas pressure regulating station residual pressure comprehensive utilization system further comprises a cold accumulation peak regulating device, wherein the cold accumulation peak regulating device comprises a subcooler A, a pump B, a cold accumulator A, a high-temperature medium cold accumulation heat exchanger and a cold storage heat exchanger; the cold accumulator A is internally filled with a cold accumulation agent;
the outlet of the upstream high-pressure natural gas pipeline is connected with the air inlet of the prime motor; the gas outlet of the prime motor is connected with the gas inlet of the natural gas end of the first condenser, the gas outlet of the natural gas end of the first condenser is connected with the gas inlet of the subcooler A, the gas outlet of the subcooler A is connected with the gas inlet of the precooler, the gas outlet of the precooler is connected with the gas inlet of the temperature regulator, and the gas outlet of the temperature regulator is connected with the gas inlet of the downstream medium-low pressure gas pipeline; the liquid outlet of the subcooler A is connected with the liquid inlet of the cold accumulator A, the liquid outlet of the cold accumulator A is connected with the liquid inlet of the pump B, and the liquid outlet of the pump B is connected with the liquid inlet of the subcooler A; the cold storage heat exchanger and the high-temperature medium cold storage heat exchanger are arranged in the cold storage device A, a first refrigerant liquid outlet of the second condenser is connected with a liquid inlet of the cold storage heat exchanger, and a liquid outlet of the cold storage heat exchanger is connected with a liquid inlet of the second throttle valve; the first refrigerant liquid outlet of the third condenser is connected with the liquid inlet of the high-temperature medium cold-storage heat exchanger, and the liquid outlet of the high-temperature medium cold-storage heat exchanger is connected with the liquid inlet of the third throttle valve.
Preferably, the natural gas pressure regulating station residual pressure comprehensive utilization system further comprises a flow regulating valve, and the gas outlet of the prime motor is connected with the gas inlet of the natural gas end of the first condenser through the flow regulating valve; and a natural gas outlet of the first condenser is connected with an air inlet of the temperature regulator through the flow regulating valve.
Preferably, the natural gas pressure regulating station residual pressure comprehensive utilization system further comprises a flow regulating valve, wherein a first refrigerant liquid outlet of the second condenser is connected with a liquid inlet of the cold storage heat exchanger of the cold storage through the flow regulating valve, and a first refrigerant liquid outlet of the second condenser is connected with a liquid inlet of the second throttling valve through the flow regulating valve.
Further, the air outlet of the second evaporator is connected with the air inlet of the second compressor through the flow regulating valve.
Preferably, the natural gas pressure regulating station residual pressure comprehensive utilization system further comprises a flow regulating valve, wherein a natural gas end gas outlet of the first condenser is connected with a gas inlet of the precooler through the flow regulating valve; and an air outlet of the precooler is connected with an air inlet of the temperature regulator through the flow regulating valve.
More preferably, the natural gas pressure regulating station residual pressure comprehensive utilization system further comprises a flow regulating valve, and an outlet of the upstream high-pressure natural gas pipeline is connected with an air inlet of the prime motor; the gas outlet of the prime motor is connected with the gas inlet of the natural gas end of the first condenser through the flow regulating valve, the gas outlet of the natural gas end of the first condenser is connected with the gas inlet of the temperature regulator through the flow regulating valve, and the gas outlet of the temperature regulator is connected with the gas inlet of the downstream medium-low pressure gas pipeline through the flow regulating valve.
Preferably, the natural gas pressure regulating station residual pressure comprehensive utilization system further comprises a flow regulating valve, wherein the first refrigerant liquid outlet of the third condenser is connected with the liquid inlet of the high-temperature medium cold storage heat exchanger through the flow regulating valve; and the first refrigerant liquid outlet of the third condenser is connected with the liquid inlet of the third throttle valve through the flow regulating valve.
Further, the air outlet of the third evaporator is connected with the air inlet of the third compressor through the flow regulating valve.
From the above technical solutions, the embodiments of the present application have the following advantages:
The application designs a natural gas pressure regulating station residual pressure comprehensive utilization system, and a natural gas pressure regulating device, a power generation device and a refrigeration house refrigerating device are started simultaneously. When the device is used, high-pressure natural gas enters the device of the embodiment of the application from the outlet of the upstream high-pressure natural gas pipeline, the high-pressure natural gas passes through the prime motor, and the prime motor drives the generator to generate power by utilizing the pressure difference generated in the pressure regulating process of the natural gas; simultaneously, the high-pressure natural gas is subjected to expansion action of a prime motor, the pressure of the high-pressure natural gas is reduced, the temperature of the high-pressure natural gas is reduced together with the pressure reduction of the high-pressure natural gas, meanwhile, the first condenser, the first compressor, the first throttle valve and the first evaporator form an electric compression refrigeration cycle, the high-pressure natural gas enters the first condenser after passing through the prime motor, the temperature of the high-pressure natural gas is reduced after being regulated, the natural gas with relatively low temperature enters the first condenser, the first compressor sucks working medium steam with lower pressure from the first evaporator, the working medium steam with higher pressure is conveyed into the first condenser after being increased in pressure, working medium liquid with higher pressure is condensed into the first condenser, the working medium liquid with lower pressure is conveyed into the first evaporator after being throttled by the throttle valve, the working medium liquid is subjected to endothermic evaporation in the first evaporator to form steam with lower pressure, the temperature of a cold storage warehouse is reduced, and then the steam with lower pressure is sucked into the first compressor to form refrigeration cycle; therefore, the natural gas with relatively low temperature and the working medium steam with relatively high temperature are subjected to heat exchange in the first condenser, the temperature of the natural gas is increased in the process, and the temperature of the working medium steam is reduced by condensation, so that the residual cold generated by the upstream high-pressure natural gas during pressure regulation is utilized to refrigerate a refrigeration house; because natural gas flow can fluctuate, residual cold for natural gas pressure regulation which provides a cold source for a refrigeration house can also fluctuate (namely, residual cold for natural gas pressure regulation cannot be stably output), when the flow of the upstream high-pressure natural gas flow fluctuates and the flow is reduced, a refrigeration house supplementing refrigeration device is started, and the refrigeration house supplementing refrigeration device can be an existing commonly used vapor compression refrigeration device or a refrigeration device with similar function; if the fluctuation condition of the natural gas flow of the upstream high pressure does not occur, a refrigeration house supplementing and refrigerating device is not required to be started, and the residual cold generated by the pressure regulation of the natural gas of the upstream high pressure is directly utilized to cool the refrigeration house. Therefore, the natural gas pressure regulating station residual pressure comprehensive utilization system can utilize the differential pressure generated in the natural gas pressure regulating process to generate power, and also utilizes residual cold generated in the natural gas pressure regulating process to cool a refrigerator warehouse.
Drawings
Fig. 1 is a block diagram of a first natural gas pressure regulating station residual pressure comprehensive utilization system provided in an embodiment of the present application;
FIG. 2 is a block diagram of a second natural gas pressure regulating station residual pressure comprehensive utilization system provided in an embodiment of the present application;
FIG. 3 is a block diagram of a third system for comprehensively utilizing residual pressure of a natural gas pressure regulating station according to an embodiment of the present application;
fig. 4 is a block diagram of a fourth comprehensive utilization system of residual pressure in a natural gas pressure regulating station provided in an embodiment of the present application;
FIG. 5 is a block diagram of a fifth system for comprehensively utilizing residual pressure in a natural gas pressure regulating station according to an embodiment of the present application;
fig. 6 is a schematic illustration of the flow control valve of fig. 1-5.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the embodiments of the present application, are within the scope of the embodiments of the present application.
In the description of the embodiments of the present application, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on directions or positional relationships shown in the drawings, are merely for convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in the embodiments of the present application will be understood by those of ordinary skill in the art in a specific context.
It should be understood that, the present application is applied to the residual pressure utilization of a natural gas pressure regulating station, refer to fig. 1, fig. 1 is a structural diagram of a first residual pressure comprehensive utilization system of a natural gas pressure regulating station provided in an embodiment of the present application, as shown in fig. 1, where fig. 1 includes a natural gas pressure regulating device, a power generating device and a refrigeration house refrigerating device; the natural gas pressure regulating device comprises a prime motor 2, a first condenser 3 and a temperature regulator 6; the outlet A of the upstream high-pressure natural gas pipeline is connected with the air inlet of the prime motor 2; the gas outlet of the prime motor 2 is connected with the gas inlet of the natural gas end of the first condenser 3, the gas outlet of the natural gas end of the first condenser 3 is connected with the gas inlet of the temperature regulator 6, and the gas outlet of the temperature regulator 6 is connected with the gas inlet B of the downstream medium-low pressure gas pipeline; the power generation device comprises a power generator 1, a prime motor 2 is coaxially connected with the power generator 1, and the power generator 1 is connected with an external power grid; the refrigeration device of the refrigeration house comprises a first compressor 19, a first throttle valve 22, a refrigeration house Y and a refrigeration house supplementing refrigeration device X; a first evaporator 21 and a second evaporator 20 are arranged in the refrigeration house Y; the gas outlet of the first compressor 19 is connected with the refrigerant gas inlet of the first condenser 3, the refrigerant liquid outlet of the first condenser 3 is connected with the liquid inlet of the first throttle valve 22, the liquid outlet of the first throttle valve 22 is connected with the liquid inlet of the first evaporator 21, the gas outlet of the first evaporator 21 is connected with the gas inlet of the first compressor 19, the liquid outlet of the second throttle valve of the refrigeration house supplementing refrigerating device X is connected with the liquid inlet of the second evaporator 20, the gas outlet of the second evaporator 20 is connected with the gas inlet of the second compressor of the refrigeration house supplementing refrigerating device X, and the refrigeration house supplementing refrigerating device X cools the refrigeration house storehouse Y through the second evaporator 20.
The application designs a natural gas pressure regulating station residual pressure comprehensive utilization system, and a natural gas pressure regulating device, a power generation device and a refrigeration house refrigerating device are started simultaneously. When the device is used, high-pressure natural gas enters the device of the embodiment of the application from the outlet A of the upstream high-pressure natural gas pipeline, the high-pressure natural gas passes through the prime motor 2, and the prime motor 2 drives the generator 1 to generate power by utilizing the pressure difference generated in the pressure regulation process of the natural gas; simultaneously, the temperature and the pressure of the high-pressure natural gas are reduced after the high-pressure natural gas passes through the expansion of the prime motor 2, the temperature of the high-pressure natural gas is reduced after the pressure of the high-pressure natural gas is reduced, meanwhile, the first condenser 3, the first compressor 19, the first throttle valve 22 and the first evaporator 21 form an electric compression refrigeration cycle, the high-pressure natural gas passes through the prime motor 2 and then enters the first condenser 3, the temperature of the high-pressure natural gas is reduced after the pressure of the high-pressure natural gas is regulated, the relatively low-temperature natural gas enters the first condenser 3, the first compressor 19 sucks working medium steam with lower pressure from the first evaporator 21, the working medium steam with higher pressure is conveyed into the first condenser 3 after the pressure is increased, the working medium liquid with higher pressure is condensed into working medium liquid after the throttling valve, the working medium liquid with lower pressure is conveyed into the first evaporator 21, the working medium steam with lower pressure is absorbed and evaporated in the first evaporator 21, the temperature of a storehouse Y is reduced, and then the low-pressure steam is sucked into the first condenser 19 to form the refrigeration cycle; therefore, the natural gas with relatively low temperature and the working medium steam with relatively high temperature are subjected to heat exchange in the first condenser 3, the temperature of the natural gas is increased in the process, and the temperature of the working medium steam is reduced by condensation, so that the residual cold generated by the upstream high-pressure natural gas during pressure regulation is utilized to refrigerate the refrigeration house Y; because natural gas flow can fluctuate, residual cold for natural gas pressure regulation which provides a cold source for the refrigeration house Y also fluctuates (namely, residual cold for natural gas pressure regulation cannot be stably output), but when the natural gas flow at high upstream pressure fluctuates and decreases, a refrigeration house supplementing refrigeration device is started, and the refrigeration house supplementing refrigeration device can be an existing common vapor compression refrigeration device or a refrigeration device with similar function; if the fluctuation condition of the natural gas flow of the upstream high pressure does not occur, a refrigeration house supplementing and refrigerating device is not required to be started, and the residual cold generated by the pressure regulation of the natural gas of the upstream high pressure is directly utilized to cool the refrigeration house Y. Therefore, the natural gas pressure regulating station residual pressure comprehensive utilization system can utilize the differential pressure generated in the natural gas pressure regulating process to generate power, and also utilizes residual cold generated in the natural gas pressure regulating process to cool the cold storage warehouse Y.
It should be noted that, the natural gas pressure regulating device and the refrigeration house refrigerating device can supply power to the natural gas pressure regulating device and the refrigeration house refrigerating device through an external power supply system, and can also supply power to the natural gas pressure regulating device and the refrigeration house refrigerating device through the power generation device.
For easy understanding, referring to fig. 2, fig. 2 is a block diagram of a second natural gas pressure regulating station residual pressure comprehensive utilization system provided in an embodiment of the present application, and as shown in fig. 2, a refrigerator supplement refrigeration device X includes a second compressor 17, a second throttle valve 14, a second condenser 15, a pump a16, and a cooling tower a 18; the gas outlet of the second compressor 17 is connected with the refrigerant gas inlet of the second condenser 15, the first refrigerant liquid outlet of the second condenser 15 is connected with the liquid inlet of the second throttle valve 14, the liquid outlet of the second throttle valve 14 is connected with the liquid inlet of the second evaporator 20, the gas outlet of the second evaporator 20 is connected with the gas inlet of the second compressor 17, the liquid outlet of the cooling tower A18 is connected with the refrigerant liquid inlet of the second condenser 15, and the second refrigerant liquid outlet of the second condenser 15 is connected with the liquid inlet of the cooling tower A18 through the pump A16. The embodiment of the application specifically defines the structure of the refrigeration house supplementing refrigeration device, mainly adopts a vapor compression refrigeration device, is further provided with a cooling tower for physical cooling of the second condenser 15, an external power supply system supplies power to the second compressor 17, the second evaporator 20, the second compressor 17, the second throttle valve 14 and the second condenser 15 form an electric compression refrigeration cycle, the working principle of the electric compression refrigeration cycle is similar to that of the first condenser 3, the first compressor 19, the first throttle valve 22 and the first evaporator 21, the second condenser 15 is additionally provided with a pump A16 and a cooling tower A18, the cooling tower is used for rapidly cooling the cooling medium, the cooling medium is pumped into the second condenser 15 through the pump A16, and the cooling medium can be subjected to heat exchange in the second condenser 15, so that the condensation effect of the second condenser 15 is better.
For easy understanding, referring to fig. 3, fig. 3 is a block diagram of a third natural gas pressure regulating station residual pressure comprehensive utilization system provided in the embodiment of the present application, and as shown in fig. 3, the embodiment further includes a cold storage peak regulating device, where the cold storage peak regulating device includes a subcooler a23, a pump B24, a cold storage device a25, and a cold storage heat exchanger 26; the cold accumulator A25 is internally filled with a cold accumulating agent; the outlet A of the upstream high-pressure natural gas pipeline is connected with the air inlet of the prime motor 2; the gas outlet of the prime motor 2 is connected with the gas inlet of the natural gas end of the first condenser 3, the gas outlet of the natural gas end of the first condenser 3 is connected with the gas inlet of the subcooler A23, the gas outlet of the subcooler A23 is connected with the gas inlet of the temperature regulator 6, and the gas outlet of the temperature regulator 6 is connected with the gas inlet B of a downstream medium-low pressure gas pipeline; the liquid outlet of the subcooler A23 is connected with the liquid inlet of the regenerator A25, the liquid outlet of the regenerator A25 is connected with the liquid inlet of the pump B24, and the liquid outlet of the pump B24 is connected with the liquid inlet of the subcooler A23; the cold storage heat exchanger 26 is arranged in the cold storage device A25, the first refrigerant liquid outlet of the second condenser 15 is connected with the liquid inlet of the cold storage heat exchanger 26, and the liquid outlet of the cold storage heat exchanger 26 is connected with the liquid inlet of the second throttle valve 14. The operation of the cold accumulation peak shaving device of the embodiment can be controlled by a flow regulating valve. The residual cold utilization system also can generate fluctuation of the cold energy provided to the cold store Y due to the fluctuation of the flow of the upstream high-pressure natural gas. When the natural gas flow is too large, the cold energy generated in the natural gas pressure regulating process cannot be fully utilized by the first condenser 3. The cold accumulation peak shaving device is used for continuously utilizing the cold energy. The cold storage agent placed in the cold storage device a25 is fed into the first condenser 3 by the action of the pump B24, so that the cold storage agent at a relatively high temperature exchanges heat with the natural gas at a relatively low temperature in the first condenser 3, the temperature of the cold storage agent is reduced, and the cold storage agent returns to the cold storage device a25 for storage. When the natural gas flow is insufficient, the refrigeration storage supplementing refrigeration device is started, the refrigerant in the second condenser 15 is conveyed into the refrigeration storage cold-storage heat exchanger 26, and the refrigerant can perform heat exchange with the cold-storage agent in the cold-storage device through the refrigeration storage cold-storage heat exchanger 26, so that the cold quantity provided by the refrigerant with the same mass flow after throttling is more than that provided by the refrigerant without passing through the refrigeration storage cold-storage heat exchanger 26, and the cold quantity additionally provided by the refrigerant is related to the temperature of the refrigerant of the refrigeration storage supplementing refrigeration device.
For easy understanding, referring to fig. 4, fig. 4 is a block diagram of a fourth system for comprehensive utilization of residual pressure in a natural gas pressure regulating station provided in an embodiment of the present application, and as shown in fig. 4, the embodiment further includes a precooler 5 and a high-temperature medium refrigerating device; the outlet A of the upstream high-pressure natural gas pipeline is connected with the air inlet of the prime motor 2; the gas outlet of the prime motor 2 is connected with the gas inlet of the natural gas end of the first condenser 3, the gas outlet of the natural gas end of the first condenser 3 is connected with the gas inlet of the natural gas end of the precooler 5, the gas outlet of the natural gas end of the precooler 5 is connected with the gas inlet of the temperature regulator 6, and the gas outlet of the temperature regulator 6 is connected with the gas inlet B of a downstream medium-low pressure gas pipeline; the high-temperature medium refrigerating device comprises a high-temperature medium pipeline, a medium container Z and a pump C7; the high-temperature medium pipeline is connected with the water inlet of the pump C7, the water outlet of the pump C7 is connected with the water inlet of the precooler 5, and the water outlet of the precooler 5 is connected with the medium container Z. The high-temperature medium is pumped into the precooler 5 from the high-temperature medium pipeline through the pump C7, heat exchange is carried out between the high-temperature medium with relatively high temperature and the natural gas with relatively low temperature in the precooler 5, and the high-temperature medium is changed into the low-temperature medium and is conveyed into the medium container Z.
Specifically, the water outlet of the medium container Z is also connected with a medium container water outlet pipeline and a flow regulating valve, the medium container water outlet pipeline is connected with the flow regulating valve, after the relatively high-temperature medium is subjected to heat exchange through the relatively high-temperature natural gas of the precooler, the temperature of the relatively high-temperature medium is reduced to be changed into a low-temperature medium, the low-temperature medium subjected to heat exchange through the precooler is conveyed into the medium container, the medium container water outlet pipeline can output the low-temperature medium, and the low-temperature medium has multiple purposes such as cooling or cooling.
Specifically, the high-temperature medium pipeline can be communicated with a temperature-adjustable medium, the medium container contains the temperature-adjustable medium, the medium can be water or other temperature-adjustable medium, for example, the temperature-adjustable medium can be air conditioner frozen backwater or other high-temperature medium, and the medium container is an air conditioner water tank; the temperature of the air conditioner freezing backwater is higher than that of natural gas in the precooler, so that heat exchange can be carried out between the air conditioner freezing backwater and the natural gas in the precooler, heat is transferred to the natural gas in the precooler at a relatively low temperature by the air conditioner freezing backwater at a relatively high temperature, finally, the temperature of the air conditioner freezing backwater at a relatively high temperature is reduced, the air conditioner freezing backwater with reduced temperature is introduced into an air conditioner water tank, and the high-temperature medium refrigerating device can be combined with the high-temperature medium supplementing refrigerating device, so that the high-temperature medium supplementing refrigerating device supplements refrigeration to the high-temperature medium refrigerating device.
For easy understanding, referring to fig. 5, fig. 5 is a block diagram of a fifth system for comprehensive utilization of residual pressure in a natural gas pressure regulating station provided in the embodiment of the present application, and as shown in fig. 5, the embodiment further includes a high-temperature medium supplementary refrigeration device, where the high-temperature medium supplementary refrigeration device includes a third evaporator 8, a third compressor 9, a third throttle valve 13, a third condenser 12, a pump D11, and a cooling tower B10; the third evaporator 8 is provided inside the medium container Z so that the third evaporator 8 refrigerates the medium of the medium container Z; the gas outlet of the third compressor 9 is connected with the refrigerant gas inlet of the third condenser 12, the first refrigerant liquid outlet of the third condenser 12 is connected with the liquid inlet of the third throttle valve 13, the liquid outlet of the third throttle valve 13 is connected with the liquid inlet of the third evaporator 8, the gas outlet of the third evaporator 8 is connected with the gas inlet of the third compressor 9, the liquid outlet of the cooling tower B10 is connected with the refrigerant liquid inlet of the third condenser 12, and the second refrigerant liquid outlet of the third condenser 12 is connected with the liquid inlet of the cooling tower B10 through the pump D11. The working principle of the high-temperature medium supplementary refrigeration device in this embodiment is similar to that of the refrigeration house supplementary refrigeration device X, the external power supply system supplies power to the third compressor 9, the third evaporator 8, the third compressor 9, the third throttle valve 13 and the third condenser 12 form a voltage reduction refrigeration cycle, the third compressor 9 sucks working medium steam with lower pressure from the third evaporator 8, the working medium steam is sent to the third condenser 12 after the pressure is increased, the working medium liquid with higher pressure is condensed into working medium liquid in the third condenser 12, the working medium liquid is sent to the third evaporator 8 after being throttled by the third throttle valve 13, the working medium liquid is absorbed and evaporated in the third evaporator 8 to form steam with lower pressure, the temperature of the medium container Z is reduced, and then the medium in the medium container Z is reduced, and the steam with lower pressure is sucked into the third compressor 9 to form the refrigeration cycle.
Further, the embodiment also comprises a cold accumulation peak regulation device, wherein the cold accumulation peak regulation device comprises a subcooler B, a pump E, a cold accumulator B and a high-temperature medium cold accumulation heat exchanger 27; the cold accumulator B is internally filled with a cold accumulating agent; the outlet A of the upstream high-pressure natural gas pipeline is connected with the air inlet of the prime motor 2; the gas outlet of the prime motor 2 is connected with the gas inlet of the natural gas end of the first condenser 3, the gas outlet of the natural gas end of the first condenser 3 is connected with the gas inlet of the subcooler B, the gas outlet of the subcooler B is connected with the gas inlet of the temperature regulator 6, and the gas outlet of the temperature regulator 6 is connected with the gas inlet B of the downstream medium-low pressure gas pipeline; the liquid outlet of the subcooler B is connected with the liquid inlet of the regenerator B, the liquid outlet of the regenerator B is connected with the liquid inlet of the pump E, and the liquid outlet of the pump E is connected with the liquid inlet of the subcooler B; the high-temperature medium cold-storage heat exchanger 27 is arranged in the cold accumulator B, the first refrigerant liquid outlet of the third condenser 12 is connected with the liquid inlet of the high-temperature medium cold-storage heat exchanger 27, and the liquid outlet of the high-temperature medium cold-storage heat exchanger 27 is connected with the liquid inlet of the third throttle valve 13.
Furthermore, the cold accumulation peak shaving device of the embodiment can store cold energy of natural gas pressure regulation in the cold accumulator of the cold accumulation peak shaving device through the cold accumulation peak shaving device, and then cold sources are respectively provided for the cold storage supplementary refrigeration device and the high temperature medium supplementary refrigeration device, so the cold accumulation peak shaving device of the embodiment comprises a subcooler A23, a pump B24, a cold accumulator A25, a cold storage cold-storage heat exchanger 26 and a high temperature medium cold-storage heat exchanger 27; the cold accumulator A25 is internally filled with a cold accumulating agent; the outlet A of the upstream high-pressure natural gas pipeline is connected with the air inlet of the prime motor 2; the gas outlet of the prime motor 2 is connected with the gas inlet of the natural gas end of the first condenser 3, the gas outlet of the natural gas end of the first condenser 3 is connected with the gas inlet of the subcooler A23, the gas outlet of the subcooler A23 is connected with the gas inlet of the precooler 5, the gas outlet of the precooler 5 is connected with the gas inlet of the temperature regulator 6, and the gas outlet of the temperature regulator 6 is connected with the gas inlet B of a downstream medium-low pressure gas pipeline; the liquid outlet of the subcooler A23 is connected with the liquid inlet of the regenerator A25, the liquid outlet of the regenerator A25 is connected with the liquid inlet of the pump B24, and the liquid outlet of the pump B24 is connected with the liquid inlet of the subcooler A23; the cold storage heat exchanger 26 and the high-temperature medium cold storage heat exchanger 27 are arranged in the cold storage A25, a first refrigerant liquid outlet of the second condenser 15 is connected with a liquid inlet of the cold storage heat exchanger 26, and a liquid outlet of the cold storage heat exchanger 26 is connected with a liquid inlet of the second throttle valve 14; the first refrigerant liquid outlet of the third condenser 12 is connected with the liquid inlet of the high-temperature medium cold-storage heat exchanger 27, and the liquid outlet of the high-temperature medium cold-storage heat exchanger 27 is connected with the liquid inlet of the third throttle valve 13. Specifically, when the natural gas flow is too large, the cold energy generated in the natural gas pressure regulating process cannot be fully utilized by the first condenser 3 and the precooler 5. The cold accumulation peak shaving device is used for continuously utilizing the cold energy. The cold storage agent placed in the cold storage device B is fed into the subcooler a23 by the action of the pump E, so that the cold storage agent at a relatively high temperature exchanges heat with the natural gas at a relatively low temperature in the subcooler a23, the temperature of the cold storage agent is reduced, and the cold storage agent returns to the cold storage device a25 for storage. When the natural gas flow is insufficient, the refrigeration storage supplementary refrigeration device and the high-temperature medium supplementary refrigeration device are started, the refrigerant in the second condenser 15 is conveyed into the refrigeration storage heat exchanger 26, the refrigerant can perform heat exchange with the cold storage agent in the cold storage device through the refrigeration storage heat exchanger 26, the refrigerant in the third condenser 12 is conveyed into the high-temperature medium cold storage heat exchanger 27, and the refrigerant can perform heat exchange with the cold storage agent in the cold storage device through the high-temperature medium cold storage heat exchanger 27, so that more cold energy can be provided by the refrigerant with the same mass flow after throttling than the refrigerant without passing through the high-temperature medium cold storage heat exchanger 27, and the additionally provided cold energy is related to the temperature of the refrigerant of the supplementary refrigeration device and the high-temperature medium supplementary refrigeration device. The cold accumulation peak shaver of the present embodiment is used to enhance the condensing effect of the third condenser 12.
The temperature regulator 6, the subcooler 23 and the precooler 5 may be heat exchangers, and the heat sources may be electric heating, industrial waste heat, hot water and other heat sources, and the high-temperature natural gas generates low-temperature natural gas through pressure regulation, and the low-temperature natural gas passes through the temperature regulator and can exchange heat with the heat source of the temperature regulator, and the low-temperature natural gas passes through the subcooler and can exchange heat with the heat source of the subcooler, and the low-temperature natural gas passes through the precooler and can exchange heat with the heat source of the precooler.
Further, the present embodiment further includes a flow rate adjusting valve 4, and fig. 6 is a flow rate adjusting valve; the air outlet of the prime motor 2 is connected with the natural gas end air inlet of the first condenser 3 through a flow regulating valve; the natural gas outlet of the first condenser 3 is connected with the gas inlet of the temperature regulator 6 through a flow regulating valve; the first refrigerant liquid outlet of the second condenser 15 is connected with the liquid inlet of the cold storage heat exchanger 26 of the cold storage through a flow regulating valve, and the first refrigerant liquid outlet of the second condenser 15 is connected with the liquid inlet of the second throttle valve 14 through a flow regulating valve; the natural gas outlet of the first condenser 3 is connected with the gas inlet of the precooler 5 through a flow regulating valve; the air outlet of the precooler 5 is connected with the air inlet of the temperature regulator 6 through a flow regulating valve; the first refrigerant liquid outlet of the third condenser 12 is connected with the liquid inlet of the high-temperature medium cold-storage heat exchanger 27 through a flow regulating valve; the first refrigerant outlet of the third condenser 12 is connected with the liquid inlet of the third throttle valve 13 through a flow regulating valve.
Further, the air outlet of the second evaporator 20 is connected with the air inlet of the second compressor 17 through a flow regulating valve; the air outlet of the third evaporator 8 is connected with the air inlet of the third compressor 9 through a flow regulating valve.
After the natural gas is acted by the prime motor 2, a flow regulating valve can be regulated according to actual requirements to control the flow of the natural gas to a condenser, a subcooler, a precooler or a temperature regulator 6; the flow regulating valve can be regulated according to actual needs to control the flow of the refrigerant or other mediums flowing to the throttle valve, the compressor, the pump, the cold storage heat exchanger of the refrigeration house, the cold storage heat exchanger of the high-temperature medium and the like.
The terms "first," "second," "third," "fourth," and the like in the description of the present application and in the above-described figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be capable of operation in sequences other than those illustrated or described herein, for example. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in this application, "at least one" means one or more, and "a plurality" means two or more. "and/or" for describing the association relationship of the association object, the representation may have three relationships, for example, "a and/or B" may represent: only a, only B and both a and B are present, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b or c may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
The above embodiments are merely for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (8)
1. The utility model provides a natural gas pressure regulating station residual pressure comprehensive utilization system which characterized in that includes:
the natural gas pressure regulating device, the power generation device and the refrigeration house refrigerating device;
the natural gas pressure regulating device comprises a prime motor, a first condenser and a temperature regulator;
the outlet of the upstream high-pressure natural gas pipeline is connected with the air inlet of the prime motor; the gas outlet of the prime motor is connected with the gas inlet of the natural gas end of the first condenser, the gas outlet of the natural gas end of the first condenser is connected with the gas inlet of the temperature regulator, and the gas outlet of the temperature regulator is connected with the gas inlet of the downstream medium-low pressure gas pipeline;
the power generation device comprises a generator, the prime motor is coaxially connected with the generator, and the generator is connected with an external power grid;
the refrigeration device of the refrigeration house comprises a first compressor, a first throttle valve, a refrigeration house warehouse and a refrigeration house supplementing refrigeration device; a first evaporator and a second evaporator are arranged in the refrigerator warehouse;
the air outlet of the first compressor is connected with the refrigerant air inlet of the first condenser, the refrigerant liquid outlet of the first condenser is connected with the liquid inlet of the first throttle valve, the liquid outlet of the first throttle valve is connected with the liquid inlet of the first evaporator, the air outlet of the first evaporator is connected with the air inlet of the first compressor, the liquid outlet of the second throttle valve of the refrigeration house supplementing refrigerating device is connected with the liquid inlet of the second evaporator, the air outlet of the second evaporator is connected with the air inlet of the second compressor of the refrigeration house supplementing refrigerating device, and the refrigeration house supplementing refrigerating device cools the refrigeration house through the second evaporator;
The refrigeration house supplementing and refrigerating device comprises a second compressor, a second throttle valve, a second condenser, a pump A and a cooling tower A;
the air outlet of the second compressor is connected with the refrigerant air inlet of the second condenser, the refrigerant liquid outlet of the second condenser is connected with the liquid inlet of the second throttle valve, the liquid outlet of the second throttle valve is connected with the liquid inlet of the second evaporator, the air outlet of the second evaporator is connected with the air inlet of the second compressor, the liquid outlet of the cooling tower A is connected with the cooling medium liquid inlet of the second condenser, and the cooling medium liquid inlet of the second condenser is connected with the liquid inlet of the cooling tower A through a pump A;
the natural gas pressure regulating station residual pressure comprehensive utilization system also comprises a precooler and a high-temperature medium refrigerating device;
the natural gas end gas outlet of the first condenser is connected with the natural gas end gas inlet of the precooler, the natural gas end gas outlet of the precooler is connected with the gas inlet of the temperature regulator, and the gas outlet of the temperature regulator is connected with the gas inlet of the downstream medium-low pressure gas pipeline;
the high-temperature medium refrigerating device comprises a precooler, a high-temperature medium pipeline, a medium container and a pump C; the high-temperature medium pipeline is connected with the water inlet of the pump C, the water outlet of the pump C is connected with the water inlet of the precooler, and the water outlet of the precooler is connected with the medium container.
2. The system for comprehensively utilizing the residual pressure of the natural gas pressure regulating station according to claim 1, further comprising a cold accumulation peak regulating device, wherein the cold accumulation peak regulating device comprises a subcooler A, a pump B, a cold accumulator A and a cold storage heat exchanger of a cold storage house; the cold accumulator A is internally filled with a cold accumulation agent;
the outlet of the upstream high-pressure natural gas pipeline is connected with the air inlet of the prime motor; the gas outlet of the prime motor is connected with the gas inlet of the natural gas end of the first condenser, the gas outlet of the natural gas end of the first condenser is connected with the gas inlet of the subcooler A, the gas outlet of the subcooler A is connected with the gas inlet of the temperature regulator, and the gas outlet of the temperature regulator is connected with the gas inlet of the downstream medium-low pressure gas pipeline; the liquid outlet of the subcooler A is connected with the liquid inlet of the cold accumulator A, the liquid outlet of the cold accumulator A is connected with the liquid inlet of the pump B, and the liquid outlet of the pump B is connected with the liquid inlet of the subcooler A; the cold storage heat exchanger of the cold storage is arranged in the cold storage device A, a first refrigerant liquid outlet of the second condenser is connected with a liquid inlet of the cold storage heat exchanger of the cold storage, and a liquid outlet of the cold storage heat exchanger of the cold storage is connected with a liquid inlet of the second throttle valve.
3. The natural gas pressure regulating station residual pressure comprehensive utilization system according to claim 1, further comprising a high temperature medium supplementing refrigeration device, wherein the high temperature medium supplementing refrigeration device comprises a third evaporator, a third compressor, a third throttle valve, a third condenser, a pump D and a cooling tower B;
the third evaporator is arranged in the medium container so that the third evaporator can refrigerate the medium in the medium container; the gas outlet of the third compressor is connected with the refrigerant gas inlet of the third condenser, the first refrigerant liquid outlet of the third condenser is connected with the liquid inlet of the third throttle valve, the liquid outlet of the third throttle valve is connected with the liquid inlet of the third evaporator, the gas outlet of the third evaporator is connected with the gas inlet of the third compressor, the liquid outlet of the cooling tower B is connected with the cooling medium liquid inlet of the third condenser, and the cooling medium liquid outlet of the third condenser is connected with the liquid inlet of the cooling tower B through a pump D.
4. The system for comprehensively utilizing the residual pressure of the natural gas pressure regulating station according to claim 3, further comprising a cold accumulation peak regulating device, wherein the cold accumulation peak regulating device comprises a subcooler B, a pump E, a cold accumulator B and a high-temperature medium cold accumulation heat exchanger; the cold accumulator B is internally filled with a cold accumulating agent;
The outlet of the upstream high-pressure natural gas pipeline is connected with the air inlet of the prime motor; the gas outlet of the prime motor is connected with the gas inlet of the natural gas end of the first condenser, the gas outlet of the natural gas end of the first condenser is connected with the gas inlet of the subcooler B, the gas outlet of the subcooler B is connected with the gas inlet of the precooler, the gas outlet of the precooler is connected with the gas inlet of the temperature regulator, and the gas outlet of the temperature regulator is connected with the gas inlet of the downstream medium-low pressure gas pipeline; the liquid outlet of the subcooler B is connected with the liquid inlet of the cold accumulator B, the liquid outlet of the cold accumulator B is connected with the liquid inlet of the pump E, and the liquid outlet of the pump E is connected with the liquid inlet of the subcooler B; the high-temperature medium cold-storage heat exchanger is arranged in the cold accumulator B, a first refrigerant liquid outlet of the third condenser is connected with a liquid inlet of the high-temperature medium cold-storage heat exchanger, and a liquid outlet of the high-temperature medium cold-storage heat exchanger is connected with a liquid inlet of the third throttle valve.
5. The system for comprehensively utilizing the residual pressure of the natural gas pressure regulating station according to claim 1, further comprising a flow regulating valve, wherein the gas outlet of the prime mover is connected with the gas inlet of the natural gas end of the first condenser through the flow regulating valve; and a natural gas outlet of the first condenser is connected with an air inlet of the temperature regulator through the flow regulating valve.
6. The natural gas pressure regulating station residual pressure comprehensive utilization system according to claim 2, further comprising a flow regulating valve, wherein the first refrigerant liquid outlet of the second condenser is connected with the liquid inlet of the cold storage heat exchanger of the cold storage through the flow regulating valve, and the first refrigerant liquid outlet of the second condenser is connected with the liquid inlet of the second throttling valve through the flow regulating valve.
7. The system for comprehensively utilizing the residual pressure of the natural gas pressure regulating station according to claim 1, further comprising a flow regulating valve, wherein a natural gas end gas outlet of the first condenser is connected with a gas inlet of the precooler through the flow regulating valve; and an air outlet of the precooler is connected with an air inlet of the temperature regulator through the flow regulating valve.
8. The system for comprehensively utilizing the residual pressure of the natural gas pressure regulating station according to claim 4, further comprising a flow regulating valve, wherein the first refrigerant liquid outlet of the third condenser is connected with the liquid inlet of the high-temperature medium cold-storage heat exchanger through the flow regulating valve; and the first refrigerant liquid outlet of the third condenser is connected with the liquid inlet of the third throttle valve through the flow regulating valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910486649.1A CN110118305B (en) | 2019-06-05 | 2019-06-05 | Residual pressure comprehensive utilization system of natural gas pressure regulating station |
Applications Claiming Priority (1)
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