CN203731092U - Device for pressurizing raw natural gas by using natural gas pipeline network pressure energy - Google Patents

Device for pressurizing raw natural gas by using natural gas pipeline network pressure energy Download PDF

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CN203731092U
CN203731092U CN201320863953.1U CN201320863953U CN203731092U CN 203731092 U CN203731092 U CN 203731092U CN 201320863953 U CN201320863953 U CN 201320863953U CN 203731092 U CN203731092 U CN 203731092U
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natural gas
heat exchanger
compression
pipeline
pressure
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何振勇
煜龙
张生
傅建青
韩金潮
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Xindi Energy Engineering Technology Co Ltd
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Xindi Energy Engineering Technology Co Ltd
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Abstract

The utility model provides a device for pressurizing natural gas by using pipeline network pressure energy. The device comprises a booster expansion turbine and a heat exchanger. The booster expansion turbine comprises an expansion end and a compression end, the expansion end comprises an inlet pipeline and an outlet pipeline, and the compression end comprises an inlet pipeline and an outlet pipeline. The inlet pipeline of the expansion end is connected with a high pressure natural gas pipeline, and the outlet pipeline of the expansion end is connected to a low temperature natural gas inlet channel of the heat exchanger. The inlet pipeline of the compression end is connected with a raw natural gas pipeline of a liquefied natural gas factory, and the outlet pipeline of the compression end is connected to a high temperature natural gas inlet channel of the heat exchanger. According to the device, the pressure difference between a high pressure pipeline network and a low pressure pipeline network is adopted, the pressure energy generated in the depressurizing process of high pressure natural gas from a natural gas station is used for pressurizing the raw natural gas of the liquefied natural gas factory, no additional compression power consumption is needed, the cooling capacity generated in the depressurizing process of the high pressure natural gas is recycled, and the depressurized natural gas enters the pipeline networks of the station after pressure regulating; meanwhile, energy consumption of the liquefied factory is obviously lowered, and loads of the station are also lowered; the process of the device is simple, and load varying operation is flexible.

Description

Utilize the device of natural gas pipe network pressure energy for raw natural gas supercharging
Technical field
The utility model relates to the device that utilizes natural gas pipe network pressure energy to be natural gas boosting, utilizes the pressure difference between high low pressure gas distributing system, for purifying and the natural gas boosting before treatment that liquefies, does not need extra compression power consumption.
Background technique
Pipeline gas is generally transported to downstream urban pipe network in high pressure mode by long distance pipeline, conventionally need to enter natural valve station being supplied to before terminal use, carries out step-down processing by voltage adjusting device, so as the pressure of rock gas can with mate with gas facility.In high-pressure natural gas, containing huge pressure energy, by the process of voltage adjusting device pressure regulation, this part pressure energy is often by slatterning in vain.In addition, due to sharply step-down of rock gas, cooling, be easy to the safe operation of voltage adjusting device and pipe-line equipment constitute a threat to and need to introduce heating facility the rock gas after lowering the temperature is heated, cause the waste of energy.If this part pressure energy is used, not only can obtain considerable income, the loss that also can reduce rock gas improves the utilization ratio of rock gas.The utilization of high-pressure natural gas pressure energy, can realize by devices such as decompressors.
CN202209192U discloses a kind of natural gas differential pressure power generation, be arranged between High-pressure Gas Pipeline and low pressure natural gas pipeline, comprise at least one turbo-expander, the inlet end of described turbo-expander is communicated with described High-pressure Gas Pipeline, and the exhaust end of described turbo-expander is communicated with described low pressure natural gas pipeline; The electricity generating device being driven by described turbo-expander; Gas heater, described gas heater connection is arranged between described High-pressure Gas Pipeline and the inlet end of described turbo-expander.
CN202791338U discloses a kind of pipeline gas pressure energy recovering device, parallel multiplex Turbine expansion unit between high-pressure natural gas pipeline and low pressure natural gas pipeline, and Turbine expansion unit is composed in series by flowmeter, control valve, decompressor successively; Decompressor output shaft is connected with power plant and carries out energy recovery.
The device that the utility model provides a kind of natural gas pipe network pressure energy to utilize is the supercharging of liquefied natural gas (LNG) plant virgin gas.
Model utility content
The purpose of this utility model is to propose a kind of device that natural gas pipe network pressure energy is natural gas boosting that utilizes, utilize the pressure difference between high low pressure pipe network, the raw natural gas supercharging that the pressure energy producing during by high-pressure natural gas step-down from existing natural valve station is liquefied natural gas (LNG) plant, without extra compression power consumption, reclaim the cold that high-pressure natural gas step-down produces simultaneously; Owing to having improved the pressure of raw natural gas, the energy consumption of liquefaction plant significantly reduces, and has also reduced on the other hand the load at door station.
The utility model provides a kind of device of natural gas pipe network pressure energy for raw natural gas supercharging that utilize, and it is characterized in that: this device comprises: booster expansion turbine and heat exchanger;
Described heat exchanger comprises high-temperature natural gas inlet channel, high-temperature natural gas outlet passage, cryogenic natural gas inlet channel and cryogenic natural gas outlet passage;
Described booster expansion turbine comprises inflating end and compression end; Inflating end comprises entrance pipe and export pipeline; Compression end comprises entrance pipe and export pipeline; The entrance pipe of described inflating end connects high pressure gas pipeline; The export pipeline of inflating end is connected to the cryogenic natural gas inlet channel of heat exchanger; The entrance pipe of described compression end connects the raw natural gas pipeline of liquefied natural gas (LNG) plant; The export pipeline of compression end is connected to the high-temperature natural gas inlet channel of heat exchanger;
The cryogenic natural gas outlet passage of described heat exchanger is connected to downstream low-pressure pipe network; The high-temperature natural gas outlet passage of described heat exchanger is connected to downstream natural gas purification and liquefaction system.
Wherein, the inflating end of booster expansion turbine described in the utility model can expand or multistage expansion (as two, three grades of expansions) for one-level; Compression end can be one-level supercharging or multi-stage booster (as two, three grades of superchargings); Gas after expansions at different levels respectively with compressions at different levels after gas heat exchange in additional heat exchanger, realize the cooling of gas after the re-heat of the gas after expansions at different levels and compression at different levels.
In another embodiment, the utility model provides a kind of device that pipe network pressure energy is natural gas boosting that utilizes, and it is characterized in that: this device comprises: booster expansion turbine and two heat exchangers, i.e. First heat exchanger and second heat exchanger; Described First heat exchanger comprises high-temperature natural gas inlet channel, high-temperature natural gas outlet passage, cryogenic natural gas inlet channel and cryogenic natural gas outlet passage; Described second heat exchanger comprises high-temperature natural gas inlet channel, high-temperature natural gas outlet passage, cryogenic natural gas inlet channel and cryogenic natural gas outlet passage;
Described booster expansion turbine comprises inflating end and compression end; Described booster expansion turbine inflating end is compound expansion, comprises first order expansion entrance pipe, first order expansion export pipeline, second level expansion entrance pipe, second level expansion export pipeline;
Described booster expansion turbine compression end is two-stage compression, comprises first order compression entrance pipe, first order compression export pipeline, second level compression entrance pipe, second level compression export pipeline;
The first order compression entrance pipe of described booster expansion turbine compression end connects the raw natural gas pipeline of liquefied natural gas (LNG) plant, first order compression export pipeline is connected to the high-temperature natural gas inlet channel of First heat exchanger, second level compression entrance pipe is connected to the high-temperature natural gas outlet passage of First heat exchanger, and second level compression export pipeline is connected to the high-temperature natural gas inlet channel of second heat exchanger;
The first order expansion entrance pipe of described booster expansion turbine inflating end connects High-pressure Gas Pipeline, first order expansion export pipeline is connected to the cryogenic natural gas inlet channel of First heat exchanger, second level expansion entrance pipe is connected to the cryogenic natural gas outlet passage of First heat exchanger, and second level expansion export pipeline is connected to the cryogenic natural gas inlet channel of second heat exchanger;
The high-temperature natural gas outlet passage of described second heat exchanger is connected to downstream natural gas purification and liquefaction system, and the cryogenic natural gas outlet passage of described second heat exchanger is connected to downstream low-pressure pipe network.
The idiographic flow of device described in the utility model is as follows:
Utilize the method for natural gas pipe network pressure energy for raw natural gas supercharging,
Enter the compression end supercharging of booster expansion turbine from the raw natural gas of liquefaction plant, after natural gas via heat exchanger after supercharging is cooling, enter natural gas purification and the liquefaction system in downstream; Enter the inflating end expansion step-down of booster expansion turbine from the high-pressure natural gas at door station, heat exchanger reclaims the low pressure natural gas pipe network after the station pressure regulation of the laggard introduction of cold described in the natural gas via after step-down.
The compression end of described booster expansion turbine can adopt one-level or secondary or three grades of superchargings, inflating end can corresponding employing one-level or secondary or three grades of expansions, gas after expansions at different levels respectively with compressions at different levels after gas heat exchange in heat exchanger, realize the cooling of gas after the re-heat of the gas after expansions at different levels and compression at different levels.
As described a kind of preferred implementation of utilizing the method that pipe network pressure energy is natural gas boosting, the method comprises:
The compression end (one-level compression) that for example, enters booster expansion turbine from the raw natural gas (pressure is 2.0~6.0MPaG) of liquefaction plant is compressed supercharging and (is for example pressurized to 4.5~8.5MPaG, preferably 5~8MPaG, more preferably 5.5~7.5MPaG), after the natural gas via heat exchanger cooling (for example to 35~45 DEG C) after supercharging, enter natural gas purification and the liquefaction system in downstream;
Inflating end (one-level expansion) step-down of expanding that for example, enters booster expansion turbine from the high-pressure natural gas (pressure is 2.0~6.0MPaG) at door station (is for example depressurized to 0.3~1.6MPaG, preferably 0.5~1.5MPaG, more preferably 0.7~1.2MPaG), cryogenic natural gas after step-down enters heat exchanger and reclaims cold (with the raw natural gas heat exchange after supercharging, for example re-heat temperature rises to 10~40 DEG C) after, the low pressure natural gas pipe network after a station pressure regulation entered.
As the described another kind of preferred implementation of utilizing the method that pipe network pressure energy is natural gas boosting, the method comprises:
The compression end that for example, enters booster expansion turbine from the raw natural gas (pressure is 2.0~6.0MPaG) of liquefaction plant is carried out two-stage compression supercharging, first order supercharging (is for example pressurized to 3.0~7.2MPaG, preferably 3.5~7.0MPaG, more preferably 4.0~6.5MPaG) after natural gas via First heat exchanger cooling (for example to 35~45 DEG C) after enter the supercharging of the compression end second level, second level supercharging (is for example pressurized to 4.5~8.5MPaG, preferably 5~8MPaG, more preferably 5.5~7.5MPaG) after rock gas enter the natural gas purification and the liquefaction system that enter downstream after second heat exchanger cooling (for example to 35~45 DEG C),
The inflating end that for example, enters booster expansion turbine from the high-pressure natural gas (pressure is 2.0~6.0MPaG) at door station carries out compound expansion step-down, the first order (is for example depressurized to 0.8~3.0MPaG after expanding, preferably 1.0~2.5MPaG, more preferably 1.5~2.0MPaG) the re-heat of natural gas via First heat exchanger (with the heat exchange gas after first order supercharging, for example re-heat to 10~40 DEG C) after enter the expansion step-down of the inflating end second level and (be for example depressurized to 0.3~1.6MPaG, preferably 0.5~1.5MPaG, more preferably 0.7~1.2MPaG), cryogenic natural gas after step-down enters second heat exchanger and reclaims cold (with the heat exchange gas after the supercharging of the second level, for example re-heat rises to 10~40 DEG C) low pressure natural gas pipe network after the station pressure regulation of laggard introduction.
Advantage of the present utility model:
What 1, the utility model provided utilizes the device that pressure energy is natural gas boosting, and the pressure energy of high pressure pipe network rock gas is converted into cold energy, and its cold energy is reclaimed;
2, the compression end of decompressor drives by inflating end, without extra compression power consumption;
3, owing to having improved the pressure of rock gas, the energy consumption of downstream natural gas liquefaction system can significantly reduce;
4, flow process is simple, device varying duty flexible operation.
Brief description of the drawings
Fig. 1 is that booster expansion turbine is the technique erection drawing of one-level compression, expansion, wherein 1 raw natural gas that is liquefied natural gas (LNG) plant, 2 is rock gas after supercharging, and 3 is rock gas to be clean and liquefaction, and 4 is high pressure pipe network rock gas, 5 is the rock gas after expansion step-down, 6 for removing the rock gas of downstream pipe network, and TEC1 is booster expansion turbine, and X1 is decompressor inflating end, C1 is decompressor compression end, and E1 is heat exchanger.
Fig. 2 is that booster expansion turbine is the technique erection drawing of two-stage compression, expansion.Wherein 7 is raw natural gas, 8 is the rock gas after one-level supercharging, 9 for removing the rock gas of two-stage supercharging, 10 is rock gas after two-stage supercharging, 11 is rock gas to be clean and liquefaction, 12 is high pressure pipe network rock gas, 13 is the rock gas after one-level expansion step-down, and 14 for removing the rock gas of compound expansion, and 15 is the rock gas after compound expansion, 16 for removing the rock gas of downstream pipe network, TEC2 is booster expansion turbine, and X2 is decompressor inflating end, and C2 is decompressor compression end, E2 is First heat exchanger, and E3 is second heat exchanger.
Embodiment
The purpose of this utility model is to propose a kind of device that pipe network pressure energy is natural gas boosting that utilizes, utilize the pressure difference between high low pressure pipe network, the raw natural gas supercharging that the pressure energy producing during by high-pressure natural gas step-down from existing natural valve station is liquefied natural gas (LNG) plant, without extra compression power consumption, reclaim the cold that high-pressure natural gas step-down produces simultaneously; Owing to having improved the pressure of rock gas, the energy consumption of liquefaction plant significantly reduces, and has also reduced on the other hand the load at door station.
As shown in Figure 1, as a kind of mode of execution of the present utility model, this device booster expansion turbine is that one-level compression, one-level expand; Described device comprises: booster expansion turbine TEC1 and heat exchanger E1;
Described heat exchanger E1 comprises high-temperature natural gas inlet channel, high-temperature natural gas outlet passage, cryogenic natural gas inlet channel and cryogenic natural gas outlet passage;
Described booster expansion turbine TEC1 comprises inflating end X1 and compression end C1; Inflating end X1 comprises entrance pipe and export pipeline; Compression end C1 comprises entrance pipe and export pipeline; The entrance pipe of described inflating end X1 connects high pressure gas pipeline; The export pipeline of inflating end X1 is connected to the cryogenic natural gas inlet channel of heat exchanger E1; The entrance pipe of described compression end C1 connects the raw natural gas pipeline of liquefied natural gas (LNG) plant; The export pipeline of compression end C1 is connected to the high-temperature natural gas inlet channel of heat exchanger E1;
The cryogenic natural gas outlet passage of described heat exchanger E1 is connected to downstream low pressure natural gas pipe network; The high-temperature natural gas outlet passage of described heat exchanger E1 is connected to downstream natural gas purification and liquefaction system.
The flow process of this device is as follows: the raw natural gas 1(pressure of liquefied natural gas (LNG) plant is 2.0~6.0MPaG) the compression end C1 supercharging that enters booster expansion turbine TEC1 (is pressurized to 4.5~8.5MPaG, preferably 5~8MPaG, more preferably 5.5~7.5MPaG), rock gas 2 after supercharging enters First Heat Exchanger E1 and is cooled to 35~45 DEG C, enters afterwards natural gas purification and the liquefaction system in downstream as rock gas 3 to be clean and liquefaction; High pressure pipe network rock gas 4(pressure from door station is 2.0~6.0MPaG) the inflating end X1 one-level expansion step-down that enters booster expansion turbine TEC1 (is depressurized to 0.3~1.6MPaG, preferably 0.5~1.5MPaG, more preferably 0.7~1.2MPaG), cryogenic natural gas 5 after step-down enters First Heat Exchanger E1 and reclaims cold, temperature rises to after 10~40 DEG C, enters the pipe network after a station pressure regulation as the rock gas 6 that removes downstream pipe network.
As shown in Figure 2, as another kind of mode of execution of the present utility model, this device booster expansion turbine is two-stage compression, compound expansion; Described this device comprises: booster expansion turbine TEC2 and two heat exchangers, i.e. First heat exchanger E2 and second heat exchanger E3; Described First heat exchanger E2 comprises high-temperature natural gas inlet channel, high-temperature natural gas outlet passage, cryogenic natural gas inlet channel and cryogenic natural gas outlet passage; Described second heat exchanger E3 comprises high-temperature natural gas inlet channel, high-temperature natural gas outlet passage, cryogenic natural gas inlet channel and cryogenic natural gas outlet passage;
Described booster expansion turbine TEC2 comprises inflating end X2 and compression end C2; Described booster expansion turbine inflating end X2 is compound expansion, comprises first order expansion entrance pipe, first order expansion export pipeline, second level expansion entrance pipe, second level expansion export pipeline;
Described booster expansion turbine compression end C2 is two-stage compression, comprises first order compression entrance pipe, first order compression export pipeline, second level compression entrance pipe, second level compression export pipeline;
The first order compression entrance pipe of described booster expansion turbine compression end C2 connects the raw natural gas pipeline of liquefied natural gas (LNG) plant, first order compression export pipeline is connected to the high-temperature natural gas inlet channel of First heat exchanger E2, second level compression entrance pipe is connected to the high-temperature natural gas outlet passage of First heat exchanger E2, and second level compression export pipeline is connected to the high-temperature natural gas inlet channel of second heat exchanger E3; The high-temperature natural gas outlet passage of described second heat exchanger E3 is connected to downstream natural gas purification and liquefaction system,
The first order expansion entrance pipe of described booster expansion turbine inflating end X2 connects High-pressure Gas Pipeline, first order expansion export pipeline is connected to the cryogenic natural gas inlet channel of First heat exchanger E2, second level expansion entrance pipe is connected to the cryogenic natural gas outlet passage of First heat exchanger E2, and second level expansion export pipeline is connected to the cryogenic natural gas inlet channel of second heat exchanger E3; The cryogenic natural gas outlet passage of described second heat exchanger E3 is connected to downstream low-pressure pipe network.
The flow process of this device is as follows: the raw natural gas 7(pressure of liquefied natural gas (LNG) plant is 2.0~6.0MPaG) enter the compression end C1 secondary booster of booster expansion turbine TEC2, rock gas 8(after first order supercharging is for example pressurized to 3.0~7.2MPaG, preferably 3.5~7.0MPaG, more preferably 4.0~6.5MPaG) enter First Heat Exchanger E2 and be cooled to 35~45 DEG C, then as going the rock gas 9 of two-stage supercharging to enter the second level supercharging of compression end C2, second level supercharging (is for example pressurized to 4.5~8.5MPaG, preferably 5~8MPaG, more preferably 5.5~7.5MPaG) after rock gas 10 enter the second heat exchanger E3 and be cooled to 35~45 DEG C, enter afterwards natural gas purification and the liquefaction system in downstream as rock gas 11 to be clean and liquefaction, high pressure pipe network rock gas 12(pressure from door station is 2.0~6.0MPaG) the inflating end X2 compound expansion step-down that enters booster expansion turbine TEC2, rock gas 13(after first order expansion step-down is for example depressurized to 0.8~3.0MPaG, preferably 1.0~2.5MPaG, more preferably 1.5~2.0MPaG) enter behind First Heat Exchanger E2 re-heat to 10~40 DEG C, enter the expansion step-down of the inflating end X2 second level as the rock gas 14 that goes compound expansion and (be for example depressurized to 0.3~1.6MPaG, preferably 0.5~1.5MPaG, more preferably 0.7~1.2MPaG), rock gas 15 after the expansion step-down of the second level enters the second heat exchanger E3 and reclaims cold, temperature rises to after 10~40 DEG C, enter the pipe network after a station pressure regulation as the rock gas 16 that removes downstream pipe network.
In addition, the compression end of booster expansion turbine described in the utility model also can adopt three grades of superchargings, inflating end also can adopt three grades of expansions, gas after expansions at different levels respectively with compressions at different levels after gas heat exchange in heat exchanger, realize the cooling of gas after the re-heat of the gas after expansions at different levels and compression at different levels.

Claims (3)

1. utilize the device that pipe network pressure energy is natural gas boosting, it is characterized in that: this device comprises: booster expansion turbine and heat exchanger;
Described heat exchanger comprises high-temperature natural gas inlet channel, high-temperature natural gas outlet passage, cryogenic natural gas inlet channel and cryogenic natural gas outlet passage;
Described booster expansion turbine comprises inflating end and compression end; Inflating end comprises entrance pipe and export pipeline; Compression end comprises entrance pipe and export pipeline; The entrance pipe of described inflating end connects high pressure gas pipeline; The export pipeline of inflating end is connected to the cryogenic natural gas inlet channel of heat exchanger; The entrance pipe of described compression end connects the raw natural gas pipeline of liquefied natural gas (LNG) plant; The export pipeline of compression end is connected to the high-temperature natural gas inlet channel of heat exchanger;
The cryogenic natural gas outlet passage of described heat exchanger is connected to downstream low-pressure pipe network; The high-temperature natural gas outlet passage of described heat exchanger is connected to downstream natural gas purification and liquefaction system.
2. device according to claim 1, it is characterized in that: the compression end of described booster expansion turbine adopts secondary or three grades of supercharging devices, inflating end adopts secondary or three grades of expansion gears, the gas after expansions at different levels respectively with compressions at different levels after gas heat exchange in additional heat exchanger.
3. utilize the device that pipe network pressure energy is natural gas boosting, it is characterized in that: this device comprises: booster expansion turbine and two heat exchangers, i.e. First heat exchanger and second heat exchanger; Described First heat exchanger comprises high-temperature natural gas inlet channel, high-temperature natural gas outlet passage, cryogenic natural gas inlet channel and cryogenic natural gas outlet passage; Described second heat exchanger comprises high-temperature natural gas inlet channel, high-temperature natural gas outlet passage, cryogenic natural gas inlet channel and cryogenic natural gas outlet passage;
Described booster expansion turbine comprises inflating end and compression end; Described booster expansion turbine inflating end is compound expansion, comprises first order expansion entrance pipe, first order expansion export pipeline, second level expansion entrance pipe, second level expansion export pipeline;
Described booster expansion turbine compression end is two-stage compression, comprises first order compression entrance pipe, first order compression export pipeline, second level compression entrance pipe, second level compression export pipeline;
The first order compression entrance pipe of described booster expansion turbine compression end connects the raw natural gas pipeline of liquefied natural gas (LNG) plant, first order compression export pipeline is connected to the high-temperature natural gas inlet channel of First heat exchanger, second level compression entrance pipe is connected to the high-temperature natural gas outlet passage of First heat exchanger, and second level compression export pipeline is connected to the high-temperature natural gas inlet channel of second heat exchanger;
The first order expansion entrance pipe of described booster expansion turbine inflating end connects High-pressure Gas Pipeline, first order expansion export pipeline is connected to the cryogenic natural gas inlet channel of First heat exchanger, second level expansion entrance pipe is connected to the cryogenic natural gas outlet passage of First heat exchanger, and second level expansion export pipeline is connected to the cryogenic natural gas inlet channel of second heat exchanger;
The high-temperature natural gas outlet passage of described second heat exchanger is connected to downstream natural gas purification and liquefaction system, and the cryogenic natural gas outlet passage of described second heat exchanger is connected to downstream low-pressure pipe network.
CN201320863953.1U 2013-12-26 2013-12-26 Device for pressurizing raw natural gas by using natural gas pipeline network pressure energy Active CN203731092U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103712062A (en) * 2013-12-26 2014-04-09 新地能源工程技术有限公司 Method and device for pressurizing raw natural gas through natural gas pipeline network pressure energy
CN105240064A (en) * 2015-11-25 2016-01-13 杰瑞石油天然气工程有限公司 LNG (Liquefied Natural Gas) energy recovery process

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103712062A (en) * 2013-12-26 2014-04-09 新地能源工程技术有限公司 Method and device for pressurizing raw natural gas through natural gas pipeline network pressure energy
CN103712062B (en) * 2013-12-26 2017-02-15 新地能源工程技术有限公司 Method and device for pressurizing raw natural gas through natural gas pipeline network pressure energy
CN105240064A (en) * 2015-11-25 2016-01-13 杰瑞石油天然气工程有限公司 LNG (Liquefied Natural Gas) energy recovery process

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