CN105779055B - A kind of natural gas mercury-removing device and method - Google Patents
A kind of natural gas mercury-removing device and method Download PDFInfo
- Publication number
- CN105779055B CN105779055B CN201610297236.5A CN201610297236A CN105779055B CN 105779055 B CN105779055 B CN 105779055B CN 201610297236 A CN201610297236 A CN 201610297236A CN 105779055 B CN105779055 B CN 105779055B
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- gas
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- unstripped gas
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Classifications
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- 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
-
- 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
- B01D53/002—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 condensation
-
- 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
- B01D53/02—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 adsorption, e.g. preparative gas chromatography
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/60—Heavy metals or heavy metal compounds
- B01D2257/602—Mercury or mercury compounds
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Organic Chemistry (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention discloses a kind of natural gas mercury-removing device and method, device includes sequentially connected unstripped gas forecooler, feed gas separator, unstripped gas aftercooler, refrigeration facility and cold catch pot etc..The positive effect of the present invention is：It is improved by the internal structure to cold catch pot, demercuration inner member is set, alcohol hydrocarbon liquid is changed to be produced by side by the extraction of cryogenic separation bottom, cryogenic liquid mercury, which is then separated by cold catch pot bottom, carries out the de- hydrocarbon of low temperature demercuration dehydration；The present invention is dehydrated de-hydrocarbon system using the cryogenic separation demercuration of unstripped gas forecooler, feed gas separator, unstripped gas aftercooler, refrigeration facility, cold catch pot composition, effectively utilizes mercury, water and the heavy hydrocarbons in cold catch pot separation removal unstripped gas.
Description
Technical field
The present invention relates to a kind of device and methods removing Hg in natural gas using low temperature separating process.
Background technology
With global natural gas resource a large amount of exploitations and natural gas as clean energy resource industry with it is civilian in answer
With natural gas serves as increasingly important role in energy field, and natural gas mercury-removing technique has become natural gas processing and place
One important component of reason.
Mercury is a kind of Common detrimental heavy metal element in natural gas, and mercury has high volatile, high toxicity, strong corrosive,
Mercury not only etching apparatus but also brings very big threat to health during natural gas processing, and mercury into environment once can also make
At environmental pollution.Therefore, security development and the mercurous natural gas of utilization, protect personal safety, prevent effectively arranging for mercury pollution environment
It is mercury removal by natural gas to apply, and reduces Hg in natural gas content.Has chemisorption, molten in current natural gas processing
The techniques such as liquid absorption, cryogenic separation, resin anion (R.A.) and UF membrane.
Invention content
The shortcomings that in order to overcome the prior art, the present invention provides a kind of natural gas mercury-removing device and methods, it is intended to solve
Due to corrosion of the mercury to equipment and the harm to environment in natural gas processing, mercury is effectively reduced to alcohol hydrocarbon liquid system and ethylene glycol
The influence of regenerative system, reducing adsorbent amount reduces construction investment.
The technical solution adopted in the present invention is：A kind of natural gas mercury-removing device, including unstripped gas forecooler, raw material qi leel
From device, unstripped gas aftercooler, refrigeration facility and cold catch pot, wherein：The outlet at bottom of unstripped gas forecooler by pipeline with
The import of feed gas separator connects, the top inlet that the gaseous phase outlet of feed gas separator passes through pipeline and unstripped gas aftercooler
The outlet at bottom of connection, unstripped gas aftercooler is connected by the import of pipeline and refrigeration facility, and the outlet of refrigeration facility passes through pipe
The import of line and cold catch pot connects, the bottom inlet that the gaseous phase outlet of cold catch pot passes through pipeline and unstripped gas aftercooler
Connection, the top exit of unstripped gas aftercooler are connect by pipeline with the bottom inlet of unstripped gas forecooler；The cryogenic separation
The side exit of device is connect by pipeline with alcohol regenerative system, and the outlet at bottom of the cold catch pot is collected by pipeline and mercury
System connects, and demercuration inner member is provided at the side exit close to cold catch pot.
The present invention also provides a kind of natural gas mercury-removing methods, include the following steps：
It is set Step 1: unstripped gas sequentially enters unstripped gas forecooler, feed gas separator, unstripped gas aftercooler and refrigeration
It applies, cold catch pot is entered after refrigeration facility cools down and carries out cryogenic separation, waits for that the liquid level of cold catch pot reaches normal level
Until；
Step 2: gaseous phase outlet of the product gas through top after cold catch pot separation enters unstripped gas aftercooler, then pass through
Upper outlet enters unstripped gas forecooler, most afterwards through unstripped gas forecooler upper outlet to outer defeated device；
Step 3: low temperature alcohol hydrocarbon liquid through pipeline after the extraction of cold catch pot side by entering alcohol regenerative system；
Step 4: low temperature mercury through pipeline after the extraction of cold catch pot bottom by entering mercury collection system.
Compared with prior art, the positive effect of the present invention is：It is improved by the internal structure to cold catch pot,
Demercuration inner member is set, alcohol hydrocarbon liquid is changed to be produced by side by the extraction of cryogenic separation bottom, cryogenic liquid mercury is then by low temperature
Separator bottom, which separates, carries out the de- hydrocarbon of low temperature demercuration dehydration；The present invention is using unstripped gas forecooler, feed gas separator, unstripped gas
The cryogenic separation demercuration dehydration de-hydrocarbon system of aftercooler, refrigeration facility, cold catch pot composition, effectively utilizes cold catch pot
Mercury, water in separation removal unstripped gas and heavy hydrocarbons.The positive effect of the present invention specific manifestation is as follows：
（1）The present invention passes through low temperature separating process so that the mercury in natural gas enters liquid phase by gas phase, can efficiently separate
Go out the mercury in natural gas, from cold catch pot side to extraction, cryogenic liquid mercury solution is produced from cold catch pot bottom, kept away alcohol hydrocarbon liquid
Exempt from the corrosion to downstream gas treatment equipment and the harm to environment.
（2）Present invention reduces the mercury contents in alcohol hydrocarbon liquid, can effectively reduce mercury to alcohol hydrocarbon liquid and glycol recycling system
The corrosion and harm of system.
Description of the drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein：
Fig. 1 is the process flow chart of the present invention；
Fig. 2 is the structural schematic diagram of cold catch pot.
Specific implementation mode
A kind of natural gas mercury-removing device, as shown in Figure 1, including：Unstripped gas forecooler 1, feed gas separator 2, unstripped gas
Aftercooler 3, refrigeration facility 4, cold catch pot 5, outer defeated device 6 etc., wherein：
The outlet at bottom of unstripped gas forecooler 1 passes through pipeline<2>It is connect with the import of feed gas separator 2, raw material qi leel
Gaseous phase outlet from device 2 passes through pipeline<3>It is connect with the top inlet of unstripped gas aftercooler 3, the bottom of unstripped gas aftercooler 3 goes out
Mouth passes through pipeline<4>It is connect with the import of refrigeration facility 4, the outlet of refrigeration facility 4 passes through pipeline<5>With cold catch pot 5
Import connects, and the gaseous phase outlet of cold catch pot 5 passes through pipeline<6>It is connect with the bottom inlet of unstripped gas aftercooler 3, unstripped gas
The top exit of aftercooler 3 passes through pipeline<7>It is connect with the bottom inlet of unstripped gas forecooler 1；The bypass of unstripped gas forecooler 1
Pipeline<8>Pass through pipeline<9>It is connect with the import of outer defeated device 6, the outlet of outer defeated device 6 and pipeline<10>Connection.
In the bypass line of unstripped gas forecooler 1<8>On be provided with regulating valve.
The side exit of cold catch pot 5 passes through pipeline<11>It is connect with alcohol regenerative system, in pipeline<11>On be provided with
Liquid level adjusting valve, the liquid level for controlling cold catch pot 5；The outlet at bottom of cold catch pot 5 passes through pipeline<12>It is received with mercury
Collecting system connects.
The liquid-phase outlet and pipeline of feed gas separator 2<13>Connection, in pipeline<13>On be provided with Liquid level adjusting valve；With
In the liquid level of control feed gas separator 2.
The structure of the cold catch pot as shown in Fig. 2, including inlet nozzle 21, gaseous phase outlet 22, alcohol hydrocarbon liquid outlet 23,
Liquid mercury exports 24, demercuration inner member 25, level-one to level Four gas liquid separation element 26 to 29, wherein：
Demercuration inner member 25, level-one to level Four gas liquid separation element 26 to 29 be arranged inside cold catch pot, with it is low
Warm Membrane Separator Cylinder for CFB Boiler is closely connected.Wherein：Level-one gas liquid separation element 26 is located at separator inlet, is followed successively by two level gas upwards
Liquid resolution element 27, three-level gas liquid separation element 28, level Four gas liquid separation element 29, in the side of cold catch pot close to outlet
Demercuration inner member 25 is set at 23.
The workflow of cold catch pot is：Natural gas, liquid mercury and alcohol hydrocarbon liquid after the refrigeration of refrigeration facility 4 is by entrance
21 enter cold catch pot, gas-liquid two-phase successively after one to level Four gas liquid separation element separation, gas phase by outlet 22 from
Cold catch pot is opened, becomes qualified gas product, alcohol hydrocarbon liquid and liquid mercury are then settled down to cold catch pot bottom；In alcohol hydrocarbon
The demercuration inner member 25 being arranged at liquid outlet 23 detaches alcohol hydrocarbon liquid and liquid mercury, alcohol hydrocarbon liquid by 23 extraction of outlet, liquid mercury by
24 extraction of outlet.
The present invention also provides a kind of natural gas mercury-removing methods, include the following steps：
Step 1: demercuration dehydration takes off hydrocarbon device when going into operation, unstripped gas is from pipeline<1>To unstripped gas forecooler 1, then through pipe
Line<2>To feed gas separator 2, then through pipeline<3>To unstripped gas aftercooler 3, then through pipeline<4>To refrigeration facility 4, it is cooled to
Pass through pipeline after required cryogenic temperature<5>Into 5 cryogenic separation of cold catch pot, wait for that 5 liquid level of cold catch pot reaches normal liquid
Until position；
Step 2: product gas is from pipeline<6>To unstripped gas aftercooler 3, then through pipeline<7>To unstripped gas forecooler 1, finally
Through pipeline<9>To outer defeated device 6；
Wherein 1 bypass line of unstripped gas forecooler<8>Upper regulating valve is according to raw material gas pipeline<2>Temperature be adjusted to
Hydrate generates 3 ~ 5 DEG C or more of temperature.
Step 3: low temperature alcohol hydrocarbon liquid is produced by 5 side of cold catch pot from pipeline<11>Into alcohol regenerative system.
Step 4: low temperature mercury is produced by 5 bottom of cold catch pot from pipeline<12>Into mercury collection system.
Wherein the liquid level of feed gas separator 2 is by pipeline<13>On Liquid level adjusting valve control, the liquid level of cold catch pot 5
By pipeline<11>On Liquid level adjusting valve control.
The present invention operation principle be：Traditional cold catch pot structure type is improved, in cold catch pot
Demercuration inner member is arranged in portion, and traditional alcohol hydrocarbon liquid is changed to be produced by side by the extraction of cold catch pot bottom.In low temperature
Under the conditions of, mercury is entered by gas phase in liquid phase, and liquid is realized in cold catch pot according to the greater density difference of mercury and alcohol hydrocarbon liquid
The separation of mercury and alcohol hydrocarbon liquid；It in addition can be according to the height of mercury content in cold catch pot gas phase, using cryogenic separation+adsorbent
Absorbing process, selectivity increase absorption hydrargyrum-removing technology in rear end.
Claims (10)
1. a kind of natural gas mercury-removing device, it is characterised in that：Including cold after unstripped gas forecooler, feed gas separator, unstripped gas
Device, refrigeration facility and cold catch pot, wherein：The outlet at bottom of unstripped gas forecooler by pipeline and feed gas separator into
Mouth connection, the gaseous phase outlet of feed gas separator is connect by pipeline with the top inlet of unstripped gas aftercooler, cold after unstripped gas
The outlet at bottom of device is connected by the import of pipeline and refrigeration facility, and the outlet of refrigeration facility passes through pipeline and cold catch pot
Import connects, and the gaseous phase outlet of cold catch pot is connect by pipeline with the bottom inlet of unstripped gas aftercooler, cold after unstripped gas
The top exit of device is connect by pipeline with the bottom inlet of unstripped gas forecooler；The side exit of the cold catch pot passes through
Pipeline is connect with alcohol regenerative system, and the outlet at bottom of the cold catch pot is connect by pipeline with mercury collection system, close
Demercuration inner member is provided at the side exit of cold catch pot.
2. a kind of natural gas mercury-removing device according to claim 1, it is characterised in that：It is in cold catch pot and alcohol regeneration
It is provided with Liquid level adjusting valve on pipeline between system.
3. a kind of natural gas mercury-removing device according to claim 1, it is characterised in that：The bottom of unstripped gas forecooler into
Bypass line is set between mouth and top exit.
4. a kind of natural gas mercury-removing device according to claim 3, it is characterised in that：In the bypass pipe of unstripped gas forecooler
Regulating valve is provided on line.
5. a kind of natural gas mercury-removing device according to claim 3, it is characterised in that：The bypass line of unstripped gas forecooler
It is connect with the import of outer defeated device by pipeline.
6. a kind of natural gas mercury-removing device according to claim 1, it is characterised in that：Go out with feed gas separator liquid phase
It is provided with Liquid level adjusting valve on the pipeline of mouth connection.
7. a kind of natural gas mercury-removing device according to claim 1, it is characterised in that：From entrance inside cold catch pot
Place is up disposed with one to level Four gas liquid separation element.
8. a kind of natural gas mercury-removing method, it is characterised in that：Include the following steps：
Step 1: unstripped gas sequentially enters unstripped gas forecooler, feed gas separator, unstripped gas aftercooler and refrigeration facility, warp
Enter cold catch pot after refrigeration facility cooling and carry out cryogenic separation, until waiting for that the liquid level of cold catch pot reaches normal level；
Step 2: gaseous phase outlet of the product gas through top after cold catch pot separation enters unstripped gas aftercooler, then through raw material
Gas aftercooler upper outlet enters unstripped gas forecooler, most afterwards through unstripped gas forecooler upper outlet to outer defeated device；
Step 3: low temperature alcohol hydrocarbon liquid through pipeline after the extraction of cold catch pot side by entering alcohol regenerative system；
Step 4: low temperature mercury through pipeline after the extraction of cold catch pot bottom by entering mercury collection system.
9. a kind of natural gas mercury-removing method according to claim 8, it is characterised in that：On unstripped gas forecooler by-pass line
Regulating valve by the pipe temperature between unstripped gas forecooler and feed gas separator be adjusted to than unstripped gas gas hydrate synthesis temperature
It spends 3 ~ 5 DEG C high.
10. a kind of natural gas mercury-removing method according to claim 8, it is characterised in that：The liquid level of feed gas separator by
The Liquid level adjusting valve being arranged on the pipeline of feed gas separator liquid-phase outlet connection is controlled, and the liquid level of cold catch pot is by low
The Liquid level adjusting valve being arranged on pipeline between warm separator and alcohol regenerative system is controlled.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610297236.5A CN105779055B (en) | 2016-05-06 | 2016-05-06 | A kind of natural gas mercury-removing device and method |
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| CN201610297236.5A CN105779055B (en) | 2016-05-06 | 2016-05-06 | A kind of natural gas mercury-removing device and method |
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| CN105779055A CN105779055A (en) | 2016-07-20 |
| CN105779055B true CN105779055B (en) | 2018-08-28 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108485722A (en) * | 2018-03-12 | 2018-09-04 | 崔静思 | The device and method that mercury recycles in a kind of coal gasification course |
| CN109187883B (en) * | 2018-10-08 | 2021-08-03 | 中国石油天然气股份有限公司 | Natural gas demercuration agent evaluation device |
| CN109486541A (en) * | 2018-11-30 | 2019-03-19 | 东南大学 | Removing means, method and the application of mercury in a kind of gas dehydration alcohols solvent |
| CN114062414B (en) * | 2020-08-07 | 2024-05-07 | 中国石油化工股份有限公司 | Method and system for collecting and quantifying mercury in thermal simulation experiment gas generating process |
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| CN103712414A (en) * | 2013-12-31 | 2014-04-09 | 苏州制氧机有限责任公司 | Natural gas liquefaction device and liquefaction process of natural gas liquefaction device |
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Effective date of registration: 20180115 Address after: 610041 Chengdu high tech Zone, Sichuan province sublimation Road No. 6 Applicant after: China Petroleum Engineering Construction Co Ltd Address before: 610041 Chengdu high tech Zone, Sichuan province sublimation Road No. 6 Applicant before: Engineering Design Co., Ltd., China Petroleum Group |
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Effective date of registration: 20210209 Address after: 100007 No. 9 North Main Street, Dongcheng District, Beijing, Dongzhimen Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. Address before: No. 6, Sichuan hi tech Zone, sublime Road, Chengdu, Sichuan Patentee before: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. |