CN104923027A - Process method for treating and sealing acid gas - Google Patents
Process method for treating and sealing acid gas Download PDFInfo
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- CN104923027A CN104923027A CN201510268496.5A CN201510268496A CN104923027A CN 104923027 A CN104923027 A CN 104923027A CN 201510268496 A CN201510268496 A CN 201510268496A CN 104923027 A CN104923027 A CN 104923027A
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- acid gas
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Abstract
The invention provides a process method for treating and sealing acid gas. The method comprises the following steps: preliminarily separating the acid gas to be treated in an acid gas separator through separation; pressurizing the acid gas through a multi-stage compressor, dehydrating the acid gas in a dehydration device at an inter-stage, continuously pressurizing the dehydrated acid gas from an inlet of the multi-stage compressor to an appropriate conveying pressure (10-20MPa), conveying the acid gas to a reinjection well through an acid gas conveying pipeline, and re-injecting the acid gas to a ground layer. According to the brand new treatment process, the acid gas is pressurized, dehydrated, conveyed through the pipeline and re-injected to the appropriate ground layer. Compared with a conventional acid gas treatment process, the brand new treatment process has the advantages that the flow is simple, the number of machine is small, fully-closed operation is carried out, the process can well adapt to the change of an acid gas load, and the operation safety is ensured. The acid gas is conveyed through a closed process and is fully injected to the ground layer to truly achieve zero emission of H2S and CO2.
Description
Technical field
The present invention is a kind of brand-new treatment process Gas Purification Factory being produced to exhaust emission acid gas, particularly relates to a kind of acid gas and seals process up for safekeeping.
Background technology
Acid gas refers to the acid gas mixture of deviating from from natural gas, and its main component is H
2s and CO
2, and containing a small amount of hydro carbons.H
2the toxicity of S is very strong, as the H in air
2s concentration makes people occur poisoning symptom when being 10 ~ 15ppm, and the work-yard environment maximum acceptable concentration of China is 10ppm, and countries in the world are to H
2the discharge of S has strict requirement.Due to CO
2greenhouse effects, countries in the world all energy-saving and emission-reduction reduce CO
2discharge capacity.On December 7th, 2009, solemn commitment has been made in the United Nations Framework Convention on Climate Change meeting of Copenhagen by Chinese Government, and the CO2 emissions of the year two thousand twenty unit GDP declined 40 ~ 45% than 2005.State Council promulgates on August 6th, 2012 in " energy-saving and emission-reduction " 12 " planning ", 2015, and national sulfur dioxide (SO2) emissions overall control is at 2086.4 ten thousand tons, and 2267.8 ten thousand tons than 2010 are respectively reduced 8%, respectively newly-increased reduction ability 6,540,000 tons.
It was environment-friendly engineering originally that natural gas is produced, in the past acid gas airborne release is produced to natural gas and require it is not very strict, along with the development of national economy society, pay attention to living environment is more next, country and industry-by-industry is corresponding has formulated stricter atmosphere pollutants emission standards.
Current Gas Purification Factory mainly through acid gas treating process raising or improve and reduce the discharge capacity of acid gas dusty gas, improve that sulfur recovery rate realizes, this is also the common practice of domestic and international natural gas purification industry.The acid gas process of current domestic natural gas purification plant all adopts the method for sulphur recovery, to H
2s carries out process and is transformed into industrial sulphur, reduces the discharge of pernicious gas, usually has Claus method and extension process and direct oxidation method etc., improves sulfur recovery rate further add tail gas treating unit to meet discharge standard.Traditional sulfur recovery method is all to meet environmental requirement, does not substantially have economic benefit, and investment is large, increases equipment investment further by increasing tail gas treating unit.
In order to be suitable for more next strict acid gas discharge standard, domestic is at present all raising by production technology or improvement, increases sulfur recovery rate, reduces acid gas discharge capacity to meet discharge standard, causes investment greatly to increase, and the income of whole factory reduces; And its by technology restriction acid gas can not 100% reclaim, environment is had a certain impact.
Traditional acid gas process is H by technology
2s is transformed into sulphur, mainly reduces H by sulphur recovery
2, from solving problem of environmental pollution at all, secondary environmental pollution can not be there is in the discharge of S pernicious gas; To CO
2do not process, cause CO
2a large amount of discharges of gas, aggravation greenhouse effects, do not utilize the target for energy-saving and emission-reduction of China to realize.
Current acid gas treating process flow process is complicated, and equipment is many, and take up an area large, in Sulfur Recovery Procedure Gas, there is H in apparatus district
2s spreads, and operating environment harm is large.Device there is numerous tower and reactor is difficult to be applicable to sour gas load wide variation.
Summary of the invention
Complicated in order to overcome acid gas treating process flow process, equipment is many, and take up an area large, in Sulfur Recovery Procedure Gas, there is H in apparatus district
2s spreads, and operating environment harm is large; There is the problem that numerous tower and reactor are difficult to applicable sour gas load wide variation in device, the invention provides a kind of acid gas process and seal process up for safekeeping, that a kind of brand-new treatment process of exhaust emission acid gas is produced to natural gas, by carrying out a kind of process that supercharging, dehydration and Cemented filling are recycled into suitable stratum to acid gas, by re-injection, acid gas is forever sealed up for safekeeping.Acid gas all injects stratum by closed process conveying and really accomplishes H
2s and CO
2zero-emission, namely can meet discharge standard, be conducive to target for energy-saving and emission-reduction realize.
The technical solution used in the present invention:
Process is sealed in a kind of acid gas process up for safekeeping, and concrete steps are:
1) be separated, pending acid gas entered acid gas separator and carries out initial gross separation;
2) dehydration supercharging, enters compound compressor and carries out supercharging, enter dewater unit and carry out processed after being pressurized to 2.5-10MPa, continue to enter compound compressor and carry out supercharging after dehydration after initial gross separation;
3) cool, step 2) in be pressurized to convenient pressure 10-20MPa after enter air cooler and tentatively cool;
4) phase controls, and in step 3), the tentatively cooled aftercooler that enters continues cooling, controls as liquid or supercritical phase to phase;
5) store, be delivered to reinjection well by conveyance conduit after being cooled to 40 DEG C-60 DEG C in step 4) and be recycled into stratum and seal up for safekeeping.
Step 2) described in compound compressor adopt reciprocating compressor, centrifugal compressor or helical-lobe compressor, also can adopt Unit Combination mode.
Described acid gas separator is connected with compound compressor, and the below of compound compressor is connected with dewater unit by pipeline, and the top outlet of dewater unit is communicated with the below entrance of compound compressor.
The another side of described compound compressor is connected with air cooler, and air cooler another side is connected with aftercooler, is communicated with below aftercooler by conveyance conduit with reinjection well.
The temperature being stored into the acid gas cooling of reinjection well in step 5) is 50 °.
Beneficial effect of the present invention:
Acid gas from purifying device for natural gas out after after separate measurement, enter multi-stage compression unit and carry out supercharging, enter dewater unit at inter-stage and carry out processed, continue to enter compound compressor entrance after finished off water and carry out supercharging, be pressurized to suitable discharge pressure, after enter acid gas conveyance conduit and be delivered to reinjection well and be recycled into stratum.
This brand-new treatment process of the present invention, be recycled into suitable stratum by carrying out supercharging, dehydration and Cemented filling to acid gas, more traditional acid gas treating process technological process is simple, equipment is few, totally-enclosed operates, and well can adapt to the change of sour gas load, ensures security of operation.Acid gas all injects stratum by closed process conveying and really accomplishes H
2s and CO
2zero-emission.
Be further described below with reference to accompanying drawing.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention.
In figure, Reference numeral is: 1, acid gas separator; 2, compound compressor; 3, dewater unit; 4, air cooler; 5, aftercooler; 6, conveyance conduit; 7, reinjection well.
Detailed description of the invention
Embodiment 1:
Complicated in order to overcome acid gas treating process flow process, equipment is many, and take up an area large, in Sulfur Recovery Procedure Gas, there is H in apparatus district
2s spreads, and operating environment harm is large; There is the problem that numerous tower and reactor are difficult to applicable sour gas load wide variation in device, process is sealed in a kind of acid gas process that the invention provides as shown in Figure 1 up for safekeeping, that a kind of brand-new treatment process of exhaust emission acid gas is produced to natural gas, by carrying out a kind of process that supercharging, dehydration and Cemented filling are recycled into suitable stratum to acid gas, by re-injection, acid gas is forever sealed up for safekeeping.Acid gas all injects stratum by closed process conveying and really accomplishes H
2s and CO
2zero-emission, namely can meet discharge standard, be conducive to target for energy-saving and emission-reduction realize.
Process is sealed in a kind of acid gas process up for safekeeping, and concrete steps are:
1) be separated, pending acid gas entered acid gas separator 1 and carry out initial gross separation;
2) dehydration supercharging, enters compound compressor 2 and carries out supercharging, enter dewater unit 3 and carry out processed after being pressurized to 2.5MPa, continue to enter compound compressor 2 and carry out supercharging after dehydration after initial gross separation;
3) cool, step 2) in be pressurized to 10MPa after enter air cooler 4 and tentatively cool;
4) phase controls, and in step 3), the tentatively cooled aftercooler 5 that enters continues cooling, controls as liquid or supercritical phase to phase;
5) store, be delivered to reinjection well 7 by conveyance conduit 6 after being cooled to 40 DEG C in step 4) and be recycled into stratum and seal up for safekeeping.
Acid gas out enters acid gas separator 1 from purifier, carry out gas-liquid separation, enter compound compressor 2 after initial gross separation and carry out supercharging, be pressurized to convenient pressure to enter dewater unit 3 and carry out processed, continue to enter compound compressor 2 after dehydration and carry out supercharging, enter air cooler 4 after being pressurized to convenient pressure tentatively to cool, enter rear cooling 5 continuation cooling after cooling to control phase, be cooled to suitable temperature to enter conveyance conduit 6 and be delivered to reinjection well 7, be injected into suitable stratum by reinjection well 7 and seal up for safekeeping.
In the present invention, acid gas separator 1 is connected with compound compressor 2, and the below of compound compressor 2 is connected with dewater unit 3 by pipeline, and the top outlet of dewater unit 3 is communicated with the below entrance of compound compressor 2; The another side of compound compressor 2 is connected with air cooler 4, and air cooler 4 another side is connected with aftercooler 5, is communicated with below aftercooler 5 by conveyance conduit 6 with reinjection well 7.
Step 2) in enter compound compressor 2 after initial gross separation and carry out supercharging, boost range is 2.5-10MPa, chooses 2.5MPa in the present embodiment.
In step 3), enter air cooler 4 after being pressurized to 10-20MPa and tentatively cool; Choose in the present embodiment and be pressurized to 10MPa.
Carry out cascade EDFA in compound compressor 2 pressurization, select suitable chilling temperature by acid gas phasor, prevent acid gas from occurring liquefaction and acid gas excessive discharge temperature, ensure compressor operating safety.Compressor Discharge Pressure considers Cemented filling and re-injection pressure.Re-injection pressure is considered at re-injection well head to the increase of the static pressure on stratum.
Ensure the delivery safety of acid gas conveyance conduit 6, prevent pipeline from course of conveying, separating out free water and corrosion is caused to pipeline, dewater between compressor stage, as acid gas concentration H
2s > 25% can not carry out acid gas dehydration, and when acid gas is in liquid phase or supercritical phase, moisture content increases greatly, there will not be free water.Described acid gas dehydration adopts triethylene glycol or molecular sieve to dewater, molecular screening acid-resisting molecular sieve.
Carry at pipeline with supercriticality or liquid state after acid medium supercharging cooling, because inter-stage dehydration maybe can not separate out free water, do not consider acid gas corrosion, pipe material can select carbon steel material.
Acid gas from purifying device for natural gas out after after separate measurement, enter compound compressor 2 groups and carry out supercharging, enter dewater unit at inter-stage and carry out processed, continue to enter compound compressor 2 entrance after finished off water and carry out supercharging, be pressurized to required discharge pressure, after enter acid gas conveyance conduit 6 and be delivered to reinjection well 7 and be recycled into stratum.
Embodiment 2:
On basis based on embodiment 1, choosing in the present embodiment and being injected into the temperature of carrying out sealing up for safekeeping in stratum is 50 DEG C.
Process is sealed in a kind of acid gas process up for safekeeping, and concrete steps are:
1) be separated, pending acid gas entered acid gas separator 1 and carry out initial gross separation;
2) dehydration supercharging, enters compound compressor 2 and carries out supercharging, enter dewater unit 3 and carry out processed after being pressurized to 2.5MPa, continue to enter compound compressor 2 and carry out supercharging after dehydration after initial gross separation;
3) cool, step 2) in be pressurized to 10MPa after enter air cooler 4 and tentatively cool;
4) phase controls, and in step 3), the tentatively cooled aftercooler 5 that enters continues cooling, controls as liquid or supercritical phase to phase;
5) store, be delivered to reinjection well 7 by conveyance conduit 6 after being cooled to 50 DEG C in step 4) and be recycled into stratum and seal up for safekeeping.
Because the attribute on stratum own is different, according to the condition on earth's surface and stratum, than being cooled to 40 DEG C to carry out sealing up for safekeeping good again at the temperature of 50 DEG C, that seals up for safekeeping is more complete, achieves H
2s and CO
2zero-emission.
Embodiment 3:
On basis based on above-mentioned two embodiments, choosing in the present embodiment and being injected into the temperature of carrying out sealing up for safekeeping in stratum is 60 DEG C.
Process is sealed in a kind of acid gas process up for safekeeping, and concrete steps are:
1) be separated, pending acid gas entered acid gas separator 1 and carry out initial gross separation;
2) dehydration supercharging, enters compound compressor 2 and carries out supercharging, enter dewater unit 3 and carry out processed after being pressurized to 2.5MPa, continue to enter compound compressor 2 and carry out supercharging after dehydration after initial gross separation;
3) cool, step 2) in be pressurized to 10MPa after enter air cooler 4 and tentatively cool;
4) phase controls, and in step 3), the tentatively cooled aftercooler 5 that enters continues cooling, controls as liquid or supercritical phase to phase;
5) store, be delivered to reinjection well 7 by conveyance conduit 6 after being cooled to 60 DEG C in step 4) and be recycled into stratum and seal up for safekeeping.
Temperature, after being cooled to 60 DEG C, being delivered to reinjection well 7 by conveyance conduit 6 and being recycled into stratum and sealing up for safekeeping.Within temperature 40 DEG C of-60 DEG C of these scopes, according to the difference on stratum, different temperature is therefrom set and carries out injection stratum and seal up for safekeeping.Such acid gas all injects stratum by closed process conveying and really accomplishes H
2s and CO
2zero-emission, namely can meet discharge standard, be conducive to target for energy-saving and emission-reduction realize.
Embodiment 4:
On basis based on above-mentioned three embodiments, the compound compressor in the present embodiment adopts reciprocating compressor, centrifugal compressor or helical-lobe compressor, can adopt Unit Combination mode.
In order to ensure the safety of booster compressor, acid gas can not be liquefied in compression process, provides safe cascade EDFA temperature according to acid gas component phase diagram curves, ensure into compressor phase be gaseous state.Compound compressor can be reciprocating compressor, centrifugal compressor or helical-lobe compressor.
In order to ensure the safety of acid gas conveyance conduit, before acid gas conveying, carry out processed.In pipe conveying procedure acid gas pipeline shutdown or in course of conveying, temperature is close to ground temperature time, acid gas water content decline have free water separate out, free water separate out acid gas conveyance conduit will be caused to corrode.Through dehydration equipment dehydration, be conveyance conduit WATER AS FLOW MEDIUM content be undersaturation, ensure in course of conveying or in stopping transportation process, do not have free water to separate out.Dehydration equipment can adopt triethylene glycol and molecular sieve to dewater.Do not have free water precipitation not carry out acid gas dehydration when acid gas concentration H2S > 25% piping feeding distance is shorter by calculating, when acid gas is in liquid phase or supercritical phase, moisture content increases greatly, there will not be free water.
Through air cooler 4 and aftercooler 5 after compound compressor 2 multi-stage booster, conveyance conduit 6 is entered after being down to suitable temperature (40-60 DEG C) according to acid gas component phasor acid gas temperature, be delivered to reinjection well 7 with supercriticality or liquid state by conveyance conduit 6, conveyance conduit 6 selects ordinary carbon steel.
This brand-new treatment process of the present invention, be recycled into suitable stratum by carrying out supercharging, dehydration and Cemented filling to acid gas, more traditional acid gas treating process technological process is simple, equipment is few, totally-enclosed operates, and well can adapt to the change of sour gas load, ensures security of operation.Acid gas all injects stratum by closed process conveying and really accomplishes H
2s and CO
2zero-emission.
Claims (5)
1. a process is sealed in acid gas process up for safekeeping, it is characterized in that: concrete steps are:
1) be separated, pending acid gas entered acid gas separator (1) and carry out initial gross separation;
2) dehydration supercharging, enters compound compressor (2) and carries out supercharging, enter dewater unit (3) and carry out processed after being pressurized to 2.5-10MPa, continue to enter compound compressor (2) and carry out supercharging after dehydration after initial gross separation;
3) cool, step 2) in be pressurized to 10-20MPa after enter air cooler (4) and tentatively cool;
4) phase controls, and in step 3), the tentatively cooled aftercooler (5) that enters continues cooling, controls as liquid or supercritical phase to phase;
5) store, be delivered to reinjection well (7) by conveyance conduit (6) after being cooled to 40 DEG C-60 DEG C in step 4) and be recycled into stratum and seal up for safekeeping.
2. process is sealed in a kind of acid gas process according to claim 1 up for safekeeping, it is characterized in that: step 2) described in compound compressor adopt reciprocating compressor, centrifugal compressor or helical-lobe compressor, also can adopt Unit Combination mode.
3. process is sealed in a kind of acid gas process according to claim 1 up for safekeeping, it is characterized in that: described acid gas separator (1) is connected with compound compressor (2), the below of compound compressor (2) is connected with dewater unit (3) by pipeline, and the top outlet of dewater unit (3) is communicated with the below entrance of compound compressor (2).
4. process is sealed in a kind of acid gas process according to claim 1 up for safekeeping, it is characterized in that: the another side of described compound compressor (2) is connected with air cooler (4), air cooler (4) another side is connected with aftercooler (5), and aftercooler (5) below is communicated with reinjection well (7) by conveyance conduit (6).
5. process is sealed in a kind of acid gas process according to claim 1 up for safekeeping, it is characterized in that: the temperature being stored into the acid gas cooling of reinjection well (7) in step 5) is 50 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510268496.5A CN104923027A (en) | 2015-05-25 | 2015-05-25 | Process method for treating and sealing acid gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510268496.5A CN104923027A (en) | 2015-05-25 | 2015-05-25 | Process method for treating and sealing acid gas |
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| CN104923027A true CN104923027A (en) | 2015-09-23 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109569253A (en) * | 2018-10-29 | 2019-04-05 | 中国石油天然气集团有限公司 | Viscous crude fireflood produces gas totally-enclosed process environment-friendly treatment method and device |
| CN110630241A (en) * | 2018-06-22 | 2019-12-31 | 中国石油天然气股份有限公司 | Reinjection system for fireflood produced gas |
| CN112442402A (en) * | 2019-09-05 | 2021-03-05 | 中国石油化工股份有限公司 | Separation process of acid gas |
| CN116062932A (en) * | 2023-01-05 | 2023-05-05 | 中煤科工西安研究院(集团)有限公司 | Mine water purification system and process for deep reinjection and co-sealing carbon dioxide |
-
2015
- 2015-05-25 CN CN201510268496.5A patent/CN104923027A/en active Pending
Non-Patent Citations (2)
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| 谌哲等: "酸气回注技术的发展与现状", 《石油与天然气化工》 * |
| 陈锐等: "酸气回注工艺及其技术优势分析", 《当代化工》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110630241A (en) * | 2018-06-22 | 2019-12-31 | 中国石油天然气股份有限公司 | Reinjection system for fireflood produced gas |
| CN109569253A (en) * | 2018-10-29 | 2019-04-05 | 中国石油天然气集团有限公司 | Viscous crude fireflood produces gas totally-enclosed process environment-friendly treatment method and device |
| CN109569253B (en) * | 2018-10-29 | 2021-07-02 | 中国石油天然气集团有限公司 | Environment-friendly treatment method and device for thick oil fireflooding produced gas full-closed process |
| CN112442402A (en) * | 2019-09-05 | 2021-03-05 | 中国石油化工股份有限公司 | Separation process of acid gas |
| CN116062932A (en) * | 2023-01-05 | 2023-05-05 | 中煤科工西安研究院(集团)有限公司 | Mine water purification system and process for deep reinjection and co-sealing carbon dioxide |
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Application publication date: 20150923 |