CN103742792A - Portal pipe network natural gas treatment system - Google Patents
Portal pipe network natural gas treatment system Download PDFInfo
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- CN103742792A CN103742792A CN201410013990.2A CN201410013990A CN103742792A CN 103742792 A CN103742792 A CN 103742792A CN 201410013990 A CN201410013990 A CN 201410013990A CN 103742792 A CN103742792 A CN 103742792A
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Abstract
The invention provides a portal pipe network natural gas treatment system comprising a main heat exchanger, a high-temperature expander, a low-temperature expander, a decarburization device and a gas-liquid separation device. The main heat exchanger comprises a first heat exchange passage, a second heat exchange passage, a third heat exchange passage, a fourth heat exchange passage and a fifth heat exchange passage, the high-temperature expander comprises a high-temperature expansion end and a high-temperature pressurizing end, and the low-temperature expander comprises a low-temperature expansion end and a low-temperature pressurizing end. After being serially connected with the low-temperature pressurizing end, the high-temperature pressurizing end is connected with an inlet of the low-temperature expansion end through the fourth heat exchange passage. The low-temperature expansion end comprises an outlet connected with a branch pipe network, and the outlet of the low-temperature expansion end is connected with the branch pipe network through the fifth heat exchange passage. The main heat exchanger, the high-temperature expander, the low-temperature expander, the decarburization device and the gas-liquid separation device are enabled to be correspondingly connected, and pressure energy generated in the natural gas pressure regulation process can be utilized to liquefy part of natural gas, so that energy resources are saved, and peak regulating capability is realized.
Description
Technical field
The present invention relates to natural gas transport field, more specifically, relate to a kind of station pipe network natural gas processing system.
Background technique
China, through NG Pipeline Construction for many years, couples together the main place of production of rock gas and main area of consumption, has formed and take pipeline of transferring natural gas from the west to the east as main radiativity pipe network.Rock gas, as a kind of clean fuel, with its unique advantage, progressively for city domestic gas and power station, and extends to the traffic and transport fields such as automobile, steamer.
Yet, because natural gas via is crossed long distance pipeline and is delivered to a minute defeated station, by a minute defeated station, flow to terminal use again, during this time must be through twice pressure regulation, when pressure regulation, natural gas temperature sharply reduces, so rock gas not only can cause damage to voltage adjusting device in pressure regulation process, also can produce a large amount of wastes of resource.
At present, the consumption ratio of rock gas in primary energy risen to 4%, and this numeral estimates that 2015 will reach 8%, and the demand of China's natural gas will reach 2730 billion cubic meters when the time comes, expect 2025, and rock gas annual requirement reaches nearly 4000 billion cubic meters.Like this, during the pressure regulation of rock gas, considerable pressure energy can be produced, if this part pressure energy can not be recycled in time, larger energy loss will be caused.
Summary of the invention
The present invention aims to provide a kind of station pipe network natural gas processing system, to solve the gas conveying system of prior art, produces the problem of larger energy loss when to natural gas pressure regulating.
For solving the problems of the technologies described above, the invention provides a kind of station pipe network natural gas processing system, comprising: main heat exchanger, high-temperature expansion machine, cryogenic expansion machine, decarbonization device and gas-liquid separation device; Wherein, main heat exchanger comprises the first heat exchanger channels, the second heat exchanger channels, the 3rd heat exchanger channels, the 4th heat exchanger channels and the 5th heat exchanger channels, high-temperature expansion machine comprises high-temperature expansion end and high temperature pressurised end, and cryogenic expansion machine comprises low-temperature expansion end and low temperature pressurized end; Decarbonization device comprises the purification import for being connected with trunk line pipe network, and the purge outlet of decarbonization device is connected with gas-liquid separation device by the second heat exchanger channels; The first heat exchanger channels comprises the import for being connected with trunk line pipe network, and the outlet of the first heat exchanger channels is connected with high-temperature expansion end, and the outlet of high-temperature expansion end is connected with the import of high temperature pressurised end by the 3rd heat exchanger channels; High temperature pressurised end is connected with the import of low-temperature expansion end by the 4th heat exchanger channels with after the series connection of low temperature pressurized end, and low-temperature expansion end comprises the outlet for being connected with branch line pipe network, and the outlet of low-temperature expansion end is connected with branch line pipe network by the 5th heat exchanger channels.
Further, door station pipe network natural gas processing system also comprises subcooler, gas-liquid separation device comprises the first flash drum, and the import of the first flash drum is connected with the outlet of the second heat exchanger channels by subcooler, and the air outlet of the first flash drum is connected with the 3rd heat exchanger channels by subcooler.
Further, main heat exchanger also comprises the 6th heat exchanger channels, and gas-liquid separation device also comprises the second flash drum; The import of the second flash drum is connected with the liquid outlet of the first flash drum, the air outlet of the second flash drum is connected with the import of high temperature pressurised end by subcooler and the 6th heat exchanger channels successively, and the second flash drum comprises the liquid outlet for being connected with LNG Liquefied natural gas gathering-device.
Further, door station pipe network natural gas processing system also comprises: compressor, and the import of compressor is connected with the outlet of the 6th heat exchanger channels, and the outlet of compressor is connected with the import of high temperature pressurised end.
Further, the outlet of compressor is also connected with the regeneration gas import of decarbonization device, and decarbonization device also comprises the regeneration gas outlet for being connected with branch line pipe network.
Further, door station pipe network natural gas processing system also comprises: the first liquid flow throttle valve, and one end of the first liquid flow throttle valve is connected with subcooler, and the other end of the first liquid flow throttle valve is connected with the import of the first flash drum; The second liquid flow throttle valve, one end of the second liquid flow throttle valve is connected with the liquid outlet of the first flash drum, and the other end of the second liquid flow throttle valve is connected with the import of the second flash drum.
Further, decarbonization device is removed to 1000ppm to 3100ppm by the CO2 in rock gas.
Further, the first liquid flow throttle valve is decompressed to 16bar to 25bar by rock gas; The second liquid flow throttle valve is decompressed to 4bar to 6bar by rock gas.
Further, compressor by natural gas boosting to 16bar to 25bar.
Further, the rock gas through high-temperature expansion end is expanded to 16bar to 25bar.
The present invention is by making main heat exchanger, high-temperature expansion machine, cryogenic expansion machine, decarbonization device correspondingly be connected with gas-liquid separation device, can utilize the pressure energy producing in the natural gas pressure regulating process part rock gas that liquefies, thereby not only save the energy but also there is the ability of peak regulation.
Accompanying drawing explanation
The accompanying drawing that forms the application's a part is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 has schematically shown the structural representation of the door station pipe network natural gas processing system in the present invention.
Reference character in figure: 10, decarbonization device; 20, main heat exchanger; 30, high-temperature expansion machine; 31, high-temperature expansion end; 32, high temperature pressurised end; 40, cryogenic expansion machine; 41, low-temperature expansion end; 42, low temperature pressurized end; 51, the first flash drum; 52, the second flash drum; 61, the first cooler; 62, the second cooler; 63, subcooler; 64, the first liquid flow throttle valve; 65, the second liquid flow throttle valve; 70, compressor; 80, dehydration de-heavy hydrocarbon apparatus; 90, desulfuration demercuration device; 100, trunk line pipe network; 200, branch line pipe network; 300, LNG Liquefied natural gas gathering-device.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
The invention provides a kind of station pipe network natural gas processing system, please refer to Fig. 1, comprising: main heat exchanger 20, high-temperature expansion machine 30, cryogenic expansion machine 40, decarbonization device 10 and gas-liquid separation device; Wherein, main heat exchanger 20 comprises the first heat exchanger channels, the second heat exchanger channels, the 3rd heat exchanger channels, the 4th heat exchanger channels and the 5th heat exchanger channels, high-temperature expansion machine 30 comprises high-temperature expansion end 31 and high temperature pressurised end 32, and cryogenic expansion machine 40 comprises low-temperature expansion end 41 and low temperature pressurized end 42; Decarbonization device 10 comprises the purification import for being connected with trunk line pipe network 100, and the purge outlet of decarbonization device 10 is connected with gas-liquid separation device by the second heat exchanger channels; The first heat exchanger channels comprises the import for being connected with trunk line pipe network 100, and the outlet of the first heat exchanger channels is connected with high-temperature expansion end 31, and the outlet of high-temperature expansion end 31 is connected with the import of high temperature pressurised end 32 by the 3rd heat exchanger channels; High temperature pressurised end 32 is connected with the import of low-temperature expansion end 41 by the 4th heat exchanger channels with after 42 series connection of low temperature pressurized end, low-temperature expansion end 41 comprises the outlet for being connected with branch line pipe network 200, and the outlet of low-temperature expansion end 41 is connected with branch line pipe network 200 by the 5th heat exchanger channels.Preferably, it is 3～5 with branch line pipe network 200 pressure ratio scopes that the present invention is applied in trunk line pipe network 100, and the pressure of branch line pipe network 200 is in the environment of 16bar to 25bar time, and now, liquefied fraction of this station pipe network natural gas processing system is 17% to 20%.
The present invention is by making main heat exchanger 20, high-temperature expansion machine 30, cryogenic expansion machine 40, decarbonization device 10 correspondingly be connected with gas-liquid separation device, can utilize the pressure energy producing in the natural gas pressure regulating process part rock gas that liquefies, thereby not only save the energy but also there is the ability of peak regulation.
Preferably, pipe network natural gas processing system comprises subcooler 63, gas-liquid separation device comprises that the import of the first flash drum 51, the first flash drums 51 is connected with the outlet of the second heat exchanger channels by subcooler 63, and the air outlet of the first flash drum 51 is connected with the 3rd heat exchanger channels by subcooler 63.Preferably, door station pipe natural gas processing system also comprises the first cooler 61 and the second cooler 62, wherein, the outlet of high temperature pressurised end 32 is connected with the import of low temperature pressurized end 42 by the first cooler 61, and the outlet of low temperature pressurized end 42 is connected with the 4th heat exchanger channels by the second cooler 62.
Preferably, main heat exchanger 20 also comprises the 6th heat exchanger channels, and gas-liquid separation device also comprises the second flash drum 52; The import of the second flash drum 52 is connected with the liquid outlet of the first flash drum 51, the air outlet of the second flash drum 52 is connected with the import of high temperature pressurised end 32 with the 6th heat exchanger channels by subcooler 63 successively, and the second flash drum 52 comprises the liquid outlet for being connected with LNG Liquefied natural gas gathering-device 300.
Preferably, door station pipe natural gas processing system also comprises: compressor 70, and the import of compressor 70 is connected with the outlet of the 6th heat exchanger channels, and the outlet of compressor 70 is connected with the import of high temperature pressurised end 32.
Preferably, the outlet of compressor 70 is also connected with the regeneration gas import of decarbonization device 10, and decarbonization device 10 also comprises the regeneration gas outlet for being connected with branch line pipe network 200.Preferably, pipe network natural gas processing door station, door station pipe natural gas processing system also comprises: dehydration de-heavy hydrocarbon apparatus 80, the purification import of dehydration de-heavy hydrocarbon apparatus 80 is connected with trunk line pipe network 100, and the dehydration purge outlet of de-heavy hydrocarbon apparatus 80 and the purification import of decarbonization device 10 are connected; The regeneration gas import of dehydration de-heavy hydrocarbon apparatus 80 is connected with the outlet of compressor 70, and dehydration de-heavy hydrocarbon apparatus 80 also comprises the regeneration gas outlet for being connected with branch line pipe network 200.Preferably, dehydration de-heavy hydrocarbon apparatus 80 sorbent used is 4A molecular sieve, makes the water dew point in rock gas be less than-70 ℃, and heavy hydrocarbon and aromatic hydrocarbon are less than 20ppm.Preferably, pipe network natural gas processing door station, door station pipe natural gas processing system also comprises: desulfuration demercuration device 90, the import of desulfuration demercuration device 90 is connected with the purge outlet of dehydration de-heavy hydrocarbon apparatus 80, and the outlet of desulfuration demercuration device 90 is connected with the purification import of decarbonization device 10.Desulfuration demercuration device sorbent used, for soaking sulphur active carbon, makes the mercury content in rock gas be less than 0.01 μ g/m
3.The virgin gas flowing out from desulfuration demercuration device 90 is divided into two strands, and one is as expanded gas flow, and one is as liquid gas flow, and expanded gas flow enters high-temperature expansion end 31 after by main heat exchanger 20, and liquid gas flow enters decarbonization device 10 to remove CO
2.
Preferably, pipe network natural gas processing door station, door station pipe natural gas processing system also comprises: one end of the first liquid flow throttle valve 64, the first liquid flow throttle valves 64 is connected with subcooler 63, and the other end of the first liquid flow throttle valve 64 is connected with the import of the first flash drum 51; One end of the second liquid flow throttle valve 65, the second liquid flow throttle valves 65 is connected with the liquid outlet of the first flash drum 51, and the other end of the second liquid flow throttle valve 65 is connected with the import of the second flash drum 52.
Preferably, decarbonization device 10 is by the CO in rock gas
2be removed to 1000ppm to 3100ppm.Preferably, decarburization sorbent used is 13X molecular sieve, and it is relevant with the pressure of the LNG Liquefied natural gas of outflow the second flash drum 52 that it deviates from degree.Preferably, when flowing out the pressure of the LNG Liquefied natural gas of the second flash drum 52 while being 4bar, decarbonization device 10 is by the CO in rock gas
2be removed to 1500ppm.Because the present invention has reduced CO
2deviate from degree, so the present invention has reduced the purification load of decarbonization device 10 to a certain extent.
Preferably, the first liquid flow throttle valve 64 is decompressed to 16bar to 25bar by rock gas; The second liquid flow throttle valve 65 is decompressed to 4bar to 6bar by rock gas.
Preferably, compressor 70 by natural gas boosting to 16bar to 25bar.A rock gas part that flows out compressor 70 enters in decarbonization device 10 and dehydration de-heavy hydrocarbon apparatus 80 as regeneration gas, and a part enters the pressurized end 32 of high-temperature expansion machine 30, for whole system provides cold.Preferably, the rock gas of the first heat exchanger channels of process main heat exchanger 20 is cooled to 255K to 265K.
Preferably, the rock gas through high-temperature expansion end 31 is expanded to 16bar to 25bar.Preferably, the rock gas through low temperature pressurized end 42 is pressurized to 26bar to 40bar.Preferably, the present invention makes to be consistent by the pressure of the rock gas after high-temperature expansion machine 30 and cryogenic expansion machine 40 and middle pressure urban pipe network, and then can reduce irreversible loss, the increase liquefied fraction of energy, the flexibility that can also improve device.When the present invention is applied to middle pressure urban pipe network, can be so that liquefied fraction reaches 17～20%.Preferably, the rock gas of the 4th heat exchanger channels of process main heat exchanger 20 is cooled to 195K to 205K.Preferably, the rock gas of process low-temperature expansion end 41 is cooled to 178K to 188K, and the water content of the rock gas after expanding is less than 5%.Preferably, the gas pressure of the rock gas of process low-temperature expansion end 41 is identical with the pressure of middle pressure pipe net, and like this, the rock gas that flows out low-temperature expansion end 41 can directly enter urban pipe network, and then can reduce irreversible loss, improves liquefied fraction.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a door station pipe network natural gas processing system, is characterized in that, comprising: main heat exchanger (20), high-temperature expansion machine (30), cryogenic expansion machine (40), decarbonization device (10) and gas-liquid separation device; Wherein, described main heat exchanger (20) comprises the first heat exchanger channels, the second heat exchanger channels, the 3rd heat exchanger channels, the 4th heat exchanger channels and the 5th heat exchanger channels, described high-temperature expansion machine (30) comprises high-temperature expansion end (31) and high temperature pressurised end (32), and described cryogenic expansion machine (40) comprises low-temperature expansion end (41) and low temperature pressurized end (42);
Described decarbonization device (10) comprises the purification import for being connected with trunk line pipe network (100), and the purge outlet of described decarbonization device (10) is connected with described gas-liquid separation device by described the second heat exchanger channels;
Described the first heat exchanger channels comprises the import for being connected with described trunk line pipe network (100), the outlet of described the first heat exchanger channels is connected with described high-temperature expansion end (31), and the outlet of described high-temperature expansion end (31) is connected with the import of described high temperature pressurised end (32) by described the 3rd heat exchanger channels;
Described high temperature pressurised end (32) is connected with the import of described low-temperature expansion end (41) by described the 4th heat exchanger channels with after described low temperature pressurized end (42) series connection, described low-temperature expansion end (41) comprises the outlet for being connected with branch line pipe network (200), and the outlet of described low-temperature expansion end (41) is connected with described branch line pipe network (200) by described the 5th heat exchanger channels.
2. door station according to claim 1 pipe network natural gas processing system, it is characterized in that, described door station pipe network natural gas processing system also comprises subcooler (63), described gas-liquid separation device comprises the first flash drum (51), the import of described the first flash drum (51) is connected with the outlet of described the second heat exchanger channels by described subcooler (63), and the air outlet of described the first flash drum (51) is connected with described the 3rd heat exchanger channels by described subcooler (63).
3. door according to claim 2 station pipe network natural gas processing system, is characterized in that, described main heat exchanger (20) also comprises the 6th heat exchanger channels, and described gas-liquid separation device also comprises the second flash drum (52); The import of described the second flash drum (52) is connected with the liquid outlet of described the first flash drum (51), the air outlet of described the second flash drum (52) is connected with the import of described high temperature pressurised end (32) by described subcooler (63) and described the 6th heat exchanger channels successively, and described the second flash drum (52) comprises the liquid outlet for being connected with LNG Liquefied natural gas gathering-device (300).
4. door according to claim 3 station pipe network natural gas processing system, is characterized in that, described door station pipe network natural gas processing system also comprises:
Compressor (70), the import of described compressor (70) is connected with the outlet of described the 6th heat exchanger channels, and the outlet of described compressor (70) is connected with the import of described high temperature pressurised end (32).
5. door station according to claim 4 pipe network natural gas processing system, it is characterized in that, the outlet of described compressor (70) is also connected with the regeneration gas import of described decarbonization device (10), and described decarbonization device (10) also comprises the regeneration gas outlet for being connected with described branch line pipe network (200).
6. door according to claim 3 station pipe network natural gas processing system, is characterized in that, described door station pipe network natural gas processing system also comprises:
The first liquid flow throttle valve (64), one end of described the first liquid flow throttle valve (64) is connected with described subcooler (63), and the other end of described the first liquid flow throttle valve (64) is connected with the import of described the first flash drum (51);
The second liquid flow throttle valve (65), one end of described the second liquid flow throttle valve (65) is connected with the liquid outlet of described the first flash drum (51), and the other end of described the second liquid flow throttle valve (65) is connected with the import of described the second flash drum (52).
7. door according to claim 4 station pipe network natural gas processing system, is characterized in that, described decarbonization device (10) is by the CO in rock gas
2be removed to 1000ppm to 3100ppm.
8. door according to claim 6 station pipe network natural gas processing system, is characterized in that, described the first liquid flow throttle valve (64) is decompressed to 16bar to 25bar by rock gas; Described the second liquid flow throttle valve (65) is decompressed to 4bar to 6bar by rock gas.
9. door station according to claim 4 pipe network natural gas processing system, is characterized in that, described compressor (70) by natural gas boosting to 16bar to 25bar.
10. door according to claim 1 station pipe network natural gas processing system, is characterized in that, the rock gas of the described high-temperature expansion end of process (31) is expanded to 16bar to 25bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410013990.2A CN103742792A (en) | 2014-01-13 | 2014-01-13 | Portal pipe network natural gas treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410013990.2A CN103742792A (en) | 2014-01-13 | 2014-01-13 | Portal pipe network natural gas treatment system |
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| CN103742792A true CN103742792A (en) | 2014-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410013990.2A Pending CN103742792A (en) | 2014-01-13 | 2014-01-13 | Portal pipe network natural gas treatment system |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101048636A (en) * | 2004-10-28 | 2007-10-03 | 普莱克斯技术有限公司 | Natural gas liquefaction system |
| CN202393170U (en) * | 2012-05-02 | 2012-08-22 | 青岛中油通用机械有限公司 | Natural gas transmission main line double-return-circuit double-expansion machine differential-pressure-type energy-saving liquefied device |
| CN202595072U (en) * | 2012-04-27 | 2012-12-12 | 新地能源工程技术有限公司 | Device for partially liquefying natural gas by using pressure energy of natural gas |
-
2014
- 2014-01-13 CN CN201410013990.2A patent/CN103742792A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101048636A (en) * | 2004-10-28 | 2007-10-03 | 普莱克斯技术有限公司 | Natural gas liquefaction system |
| CN202595072U (en) * | 2012-04-27 | 2012-12-12 | 新地能源工程技术有限公司 | Device for partially liquefying natural gas by using pressure energy of natural gas |
| CN202393170U (en) * | 2012-05-02 | 2012-08-22 | 青岛中油通用机械有限公司 | Natural gas transmission main line double-return-circuit double-expansion machine differential-pressure-type energy-saving liquefied device |
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Application publication date: 20140423 |
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