CN106753640A - Tail gas recycling system and method during a kind of natural gas purification - Google Patents
Tail gas recycling system and method during a kind of natural gas purification Download PDFInfo
- Publication number
- CN106753640A CN106753640A CN201611193553.9A CN201611193553A CN106753640A CN 106753640 A CN106753640 A CN 106753640A CN 201611193553 A CN201611193553 A CN 201611193553A CN 106753640 A CN106753640 A CN 106753640A
- Authority
- CN
- China
- Prior art keywords
- natural gas
- mdea
- gas
- depickling
- resolution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
- C10L3/102—Removal of contaminants of acid contaminants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1425—Regeneration of liquid absorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
Abstract
The invention discloses tail gas recycling system and method during a kind of natural gas purification, including absorption tower, MDEA solution and natural gas are passed through in the absorption tower, first depickling is carried out to natural gas by MDEA solution, obtain the natural gas after depickling；Flash tank, the flash tank is connected with the absorption tower liquid phase, for being flashed to the MDEA rich solutions after depickling, obtains the MDEA rich solutions after amine liquid flashed vapour and flash distillation；Regenerator, the regenerator is connected with the flash tank liquid phase, for being regenerated to the MDEA rich solutions after flash distillation, obtains MDEA lean solutions and resolution gas；Compressor, the flash tank and the regenerator are connected with the compressor gas phase, for resolution gas, amine liquid flashed vapour to be pressurized after flow into downstream pipe network.The present invention realizes non-exhaust emission on the premise of pipe network natural gas quality is not influenceed, and reduces atmosphere pollution.
Description
Technical field
Utilized the present invention relates to tail gas recycle during natural gas technical field, more particularly to a kind of natural gas purification
System and method.
Background technology
At present, when desulfurization process are carried out to natural gas, resolution gas are all directly emptying discharges, cause atmosphere pollution.
In the prior art, resolution gas are processed rationally to utilize without further.
Therefore, prior art has yet to be improved and developed.
The content of the invention
In view of above-mentioned the deficiencies in the prior art, return it is an object of the invention to provide tail gas during a kind of natural gas purification
Receipts utilize system and method, it is intended to when solution carries out desulfurization process to natural gas in the prior art, and resolution gas are all directly emptying
Discharge, causes the defect of atmosphere pollution.
Technical scheme is as follows：
Tail gas recycling system during a kind of natural gas purification, wherein, including：
Absorption tower, is passed through MDEA solution and natural gas in the absorption tower, first depickling is carried out to natural gas by MDEA solution,
Obtain the natural gas after depickling；
Flash tank, the flash tank is connected with the absorption tower liquid phase, for being flashed to the MDEA rich solutions after depickling, obtains
MDEA rich solutions after amine liquid flashed vapour and flash distillation；
Regenerator, the regenerator is connected with the flash tank liquid phase, for being regenerated to the MDEA rich solutions after flash distillation, obtains
MDEA lean solutions and resolution gas；
Compressor, the flash tank and the regenerator are connected with the compressor gas phase, for resolution gas, amine liquid to be dodged
Steam flows into downstream pipe network after being pressurized.
Tail gas recycling system during the natural gas purification, wherein, the resolution gas include CO2, natural gas and
H2S。
Tail gas recycling system during the natural gas purification, wherein, the resolution gas are also condensed and gravity
Enter compressor after the dewater treatment of separation.
Tail gas recycling system during the natural gas purification, wherein, the temperature in the absorption tower is 43-45
DEG C, pressure is 4MPa.
Tail gas recycling system during the natural gas purification, wherein, the temperature flashed in the flash tank
It it is 43-45 DEG C, pressure is 0.6MPa.
Tail gas recycling system during the natural gas purification, wherein, the temperature regenerated in the regenerator
It it is 105-115 DEG C, pressure is 0.03-0.05Mpa.
Tail gas recycle Application way during a kind of natural gas purification, wherein, the described method comprises the following steps：
MDEA solution and natural gas are passed through in A, absorption tower, first depickling is carried out to natural gas by MDEA solution, obtain depickling
Natural gas afterwards；
B, flash tank are flashed to the MDEA rich solutions after depickling, obtain the MDEA rich solutions after amine liquid flashed vapour and flash distillation；
C, regenerator regenerate to the MDEA rich solutions after flash distillation, obtain MDEA lean solutions and resolution gas；
D, compressor flow into downstream pipe network after being pressurized resolution gas, amine liquid flashed vapour.
Tail gas recycle Application way during the natural gas purification, wherein, the resolution gas include CO2, natural gas and
H2S。
Tail gas recycle Application way during the natural gas purification, wherein, the resolution gas are also condensed and gravity
Enter compressor after the dewater treatment of separation.
Tail gas recycle Application way during the natural gas purification, wherein, the temperature regenerated in the regenerator
It it is 105-115 DEG C, pressure is 0.03-0.05Mpa.
Tail gas recycling system and method during natural gas purification provided by the present invention, including absorption tower, it is described
MDEA solution and natural gas are passed through in absorption tower, first depickling is carried out to natural gas by MDEA solution, obtain the day after depickling
Right gas；Flash tank, the flash tank is connected with the absorption tower liquid phase, for being flashed to the MDEA rich solutions after depickling, obtains
MDEA rich solutions to after amine liquid flashed vapour and flash distillation；Regenerator, the regenerator is connected with the flash tank liquid phase, for right
MDEA rich solutions after flash distillation are regenerated, and obtain MDEA lean solutions and resolution gas；Compressor, the flash tank and the regenerator
Be connected with the compressor gas phase, for resolution gas, amine liquid flashed vapour to be pressurized after flow into downstream pipe network.The present invention exists
On the premise of not influenceing pipe network natural gas quality, non-exhaust emission is realized, reduce atmosphere pollution.
Brief description of the drawings
Fig. 1 is the structural representation of tail gas recycling system preferred embodiment during natural gas purification of the present invention
Figure.
Fig. 2 is the flow chart of tail gas recycle Application way preferred embodiment during natural gas purification of the present invention.
Specific embodiment
The present invention provides tail gas recycling system and method during a kind of natural gas purification, to make mesh of the invention
, technical scheme and effect it is clearer, clear and definite, the present invention is described in more detail below.It should be appreciated that described herein
Specific embodiment be only used to explain the present invention, be not intended to limit the present invention.
As shown in figure 1, being the knot of tail gas recycling system preferred embodiment during natural gas purification of the present invention
Structure schematic diagram, tail gas recycling system includes during the natural gas purification：
Absorption tower 100, is passed through MDEA solution and natural gas in the absorption tower 100, natural gas is carried out just by MDEA solution
Secondary depickling, obtains the natural gas after depickling；
Flash tank 200, the flash tank 200 is connected with the liquid phase of the absorption tower 100, for being carried out to the MDEA rich solutions after depickling
Flash distillation, obtains the MDEA rich solutions after amine liquid flashed vapour and flash distillation；
Regenerator 300, the regenerator 300 is connected with the liquid phase of the flash tank 200, for being carried out to the MDEA rich solutions after flash distillation
Regeneration, obtains MDEA lean solutions and resolution gas；
Compressor 400, the flash tank 200 and the regenerator 300 are connected with the gas phase of the compressor 400, for that will solve
Gassing, amine liquid flashed vapour flow into downstream pipe network 500 after being pressurized.
In embodiments of the invention, normal production non-exhaust emission is realized, amine liquid flashed vapour and resolution gas are through compressor 400
Downstream pipe network 500, big tank BOG are sent into after supercharging（Boil of gas, i.e. flashed vapour）Gas send after being also pressurized by compressor 400
Enter downstream pipe network 500.On the premise of pipe network natural gas quality is not influenceed, non-exhaust emission is realized.Atmosphere pollution is reduced,
It is main to be that of avoiding the possibility for concentrating discharge stink to disturb residents on the spot, while also reducing factory's operating cost.
Wherein, MDEA solution（Methyldiethanolamine, is abbreviated as MDEA, i.e. hydramine, also known as methyl diethanol
Amine）Sour gas is not being absorbed（Such as CO2、H2S etc.）When be MDEA lean solutions, after sour gas is absorbed then be MDEA rich solutions.
In absorption tower, it is then MDEA rich solutions that MDEA solution is absorbed after the sour gas in natural gas, now the flash distillation of MDEA rich solutions flow direction
Tank 200；In flash tank 200, MDEA rich solutions are flashed, obtain the MDEA rich solutions after amine liquid flashed vapour and flash distillation, flash distillation
MDEA rich solutions afterwards flow to regenerator 300；In regenerator 300, the MDEA rich solutions after flash distillation are regenerated, obtain MDEA poor
Liquid and resolution gas.
Preferably, in tail gas recycling system during the natural gas purification, the resolution gas include CO2, day
Right gas and H2S.Wherein, micro H is only contained in resolution gas2S, about 1-2ppm, flow directly into downstream pipe network and do not interfere with day
Right gas quality.
Preferably, in tail gas recycling system during the natural gas purification, the resolution gas are also condensed
And enter compressor 400 after the dewater treatment of Gravity Separation.
Preferably, in tail gas recycling system during the natural gas purification, the temperature in the absorption tower is
43-45 DEG C, pressure is 4MPa.
Preferably, in tail gas recycling system during the natural gas purification, flashed in the flash tank
Temperature be 43-45 DEG C, pressure is 0.6MPa.
Preferably, in tail gas recycling system during the natural gas purification, regenerated in the regenerator
Temperature be 105-115 DEG C, pressure is 0.03-0.05Mpa.
Based on above method embodiment, the present invention also provides tail gas recycle Application way during a kind of natural gas purification.
As shown in Fig. 2 tail gas recycle Application way is comprised the following steps during the natural gas purification：
MDEA solution and natural gas are passed through in step S100, absorption tower, first depickling is carried out to natural gas by MDEA solution, obtained
Natural gas after to depickling；
Step S200, flash tank are flashed to the MDEA rich solutions after depickling, and the MDEA obtained after amine liquid flashed vapour and flash distillation is rich
Liquid；
Step S300, regenerator regenerate to the MDEA rich solutions after flash distillation, obtain MDEA lean solutions and resolution gas；
Step S400, compressor flow into downstream pipe network after being pressurized resolution gas, amine liquid flashed vapour.
Preferably, in tail gas recycle Application way during the natural gas purification, the resolution gas include CO2, day
Right gas and H2S。
Preferably, in tail gas recycle Application way during the natural gas purification, the resolution gas also need to carry out cold
Enter compressor after the solidifying and dewater treatment of Gravity Separation.
Preferably, in tail gas recycle Application way during the natural gas purification, the temperature in the absorption tower is
43-45 DEG C, pressure is 4MPa.
Preferably, in tail gas recycle Application way during the natural gas purification, flashed in the flash tank
Temperature be 43-45 DEG C, pressure is 0.6MPa.
Preferably, in tail gas recycle Application way during the natural gas purification, regenerated in the regenerator
Temperature be 105-115 DEG C, pressure is 0.03-0.05Mpa.
In sum, tail gas recycling system and method during natural gas purification provided by the present invention, including inhale
Tower is received, MDEA solution and natural gas are passed through in the absorption tower, first depickling is carried out to natural gas by MDEA solution, taken off
Natural gas after acid；Flash tank, the flash tank is connected with the absorption tower liquid phase, for being carried out to the MDEA rich solutions after depickling
Flash distillation, obtains the MDEA rich solutions after amine liquid flashed vapour and flash distillation；Regenerator, the regenerator connects with the flash tank liquid phase
Connect, for being regenerated to the MDEA rich solutions after flash distillation, obtain MDEA lean solutions and resolution gas；Compressor, the flash tank and
The regenerator is connected with the compressor gas phase, for resolution gas, amine liquid flashed vapour to be pressurized after flow into downstream tube
Net.The present invention realizes non-exhaust emission on the premise of pipe network natural gas quality is not influenceed, and reduces atmosphere pollution.
It should be appreciated that application of the invention is not limited to above-mentioned citing, and for those of ordinary skills, can
To be improved according to the above description or converted, all these modifications and variations should all belong to the guarantor of appended claims of the present invention
Shield scope.
Claims (10)
1. tail gas recycling system during a kind of natural gas purification, it is characterised in that including：
Absorption tower, is passed through MDEA solution and natural gas in the absorption tower, first depickling is carried out to natural gas by MDEA solution,
Obtain the natural gas after depickling；
Flash tank, the flash tank is connected with the absorption tower liquid phase, for being flashed to the MDEA rich solutions after depickling, obtains
MDEA rich solutions after amine liquid flashed vapour and flash distillation；
Regenerator, the regenerator is connected with the flash tank liquid phase, for being regenerated to the MDEA rich solutions after flash distillation, obtains
MDEA lean solutions and resolution gas；
Compressor, the flash tank and the regenerator are connected with the compressor gas phase, for resolution gas, amine liquid to be dodged
Steam flows into downstream pipe network after being pressurized.
2. tail gas recycling system during natural gas purification according to claim 1, it is characterised in that the resolution gas
Including CO2, natural gas and H2S。
3. tail gas recycling system during natural gas purification according to claim 1, it is characterised in that the resolution gas
Also need to be condensed and the dewater treatment of Gravity Separation after enter compressor.
4. tail gas recycling system during natural gas purification according to claim 1, it is characterised in that the absorption tower
In temperature be 43-45 DEG C, pressure is 4MPa.
5. tail gas recycling system during natural gas purification according to claim 1, it is characterised in that the flash tank
In the temperature that is flashed be 43-45 DEG C, pressure is 0.6MPa.
6. tail gas recycling system during natural gas purification according to claim 1, it is characterised in that the regenerator
In the temperature that is regenerated be 105-115 DEG C, pressure is 0.03-0.05Mpa.
7. tail gas recycle Application way during a kind of natural gas purification, it is characterised in that the described method comprises the following steps：
MDEA solution and natural gas are passed through in A, absorption tower, first depickling is carried out to natural gas by MDEA solution, obtain depickling
Natural gas afterwards；
B, flash tank are flashed to the MDEA rich solutions after depickling, obtain the MDEA rich solutions after amine liquid flashed vapour and flash distillation；
C, regenerator regenerate to the MDEA rich solutions after flash distillation, obtain MDEA lean solutions and resolution gas；
D, compressor flow into downstream pipe network after being pressurized resolution gas, amine liquid flashed vapour.
8. tail gas recycle Application way during natural gas purification according to claim 7, it is characterised in that the resolution gas
Including CO2, natural gas and H2S。
9. tail gas recycle Application way during natural gas purification according to claim 7, it is characterised in that the resolution gas
Also condensed and the dewater treatment of Gravity Separation after enter compressor.
10. tail gas recycle Application way during natural gas purification according to claim 7, it is characterised in that the regeneration
The temperature regenerated in tower is 105-115 DEG C, and pressure is 0.03-0.05Mpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611193553.9A CN106753640A (en) | 2016-12-21 | 2016-12-21 | Tail gas recycling system and method during a kind of natural gas purification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611193553.9A CN106753640A (en) | 2016-12-21 | 2016-12-21 | Tail gas recycling system and method during a kind of natural gas purification |
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| CN106753640A true CN106753640A (en) | 2017-05-31 |
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| CN201611193553.9A Pending CN106753640A (en) | 2016-12-21 | 2016-12-21 | Tail gas recycling system and method during a kind of natural gas purification |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3236600A1 (en) * | 1982-10-02 | 1984-04-05 | Basf Ag, 6700 Ludwigshafen | METHOD FOR REMOVING CO (DOWN ARROW) 2 (DOWN ARROW) AND, IF NECESSARY, H (DOWN ARROW) 2 (DOWN ARROW) S FROM NATURAL GAS |
| CN202808741U (en) * | 2012-10-10 | 2013-03-20 | 中国石油集团工程设计有限责任公司 | Deep purification system for natural gas desulfuration and decarburization |
| CN104902982A (en) * | 2012-12-21 | 2015-09-09 | 埃克森美孚研究工程公司 | CO2 capture via amine-CO2 product phase separation |
| CN205011722U (en) * | 2015-09-25 | 2016-02-03 | 新地能源工程技术有限公司 | Device that contains high concentration CO2 natural gas or synthetic gas decarbonization |
| CN105664671A (en) * | 2016-03-17 | 2016-06-15 | 中石化南京工程有限公司 | Zero-carbon emission process gas purification method and device |
-
2016
- 2016-12-21 CN CN201611193553.9A patent/CN106753640A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3236600A1 (en) * | 1982-10-02 | 1984-04-05 | Basf Ag, 6700 Ludwigshafen | METHOD FOR REMOVING CO (DOWN ARROW) 2 (DOWN ARROW) AND, IF NECESSARY, H (DOWN ARROW) 2 (DOWN ARROW) S FROM NATURAL GAS |
| CN202808741U (en) * | 2012-10-10 | 2013-03-20 | 中国石油集团工程设计有限责任公司 | Deep purification system for natural gas desulfuration and decarburization |
| CN104902982A (en) * | 2012-12-21 | 2015-09-09 | 埃克森美孚研究工程公司 | CO2 capture via amine-CO2 product phase separation |
| CN205011722U (en) * | 2015-09-25 | 2016-02-03 | 新地能源工程技术有限公司 | Device that contains high concentration CO2 natural gas or synthetic gas decarbonization |
| CN105664671A (en) * | 2016-03-17 | 2016-06-15 | 中石化南京工程有限公司 | Zero-carbon emission process gas purification method and device |
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