CN100518891C - Polyethyleneglycol dimethyl ether desulfurizing system optimization extracting and concentrating technology - Google Patents
Polyethyleneglycol dimethyl ether desulfurizing system optimization extracting and concentrating technology Download PDFInfo
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- CN100518891C CN100518891C CNB2007100158053A CN200710015805A CN100518891C CN 100518891 C CN100518891 C CN 100518891C CN B2007100158053 A CNB2007100158053 A CN B2007100158053A CN 200710015805 A CN200710015805 A CN 200710015805A CN 100518891 C CN100518891 C CN 100518891C
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Abstract
The present invention discloses optimized concentration process of NHD desulfurization system, and has the advantages of environment friendship, high S recovering rate, reuse of recovered material, etc. The optimized concentration process includes: 1. feeding the rich NHD solution with absorbed hydrogen sulfide to the flash tank I; 2. connecting the flash tank I to the flashed gas pipeline in the gas phase outlet side of the flash tank II; 3. heating the rich solution from the flash tank II to 90-130 deg.c in a heat exchanger and high temperature decompression regenerating the rich solution in a low pressure flash tank at pressure lower than 30 KPa; 4. water cooling and separating flash gas from the low pressure flash tank, pressurizing to 50-150 KPa, mixing with flash gas from the flash tank II, pressurizing the gas mixture in desulfurizing flash machine, and returning to the concentrating tower system; and 5. regenerating the rich solution from the low pressure flash tank in a regenerating tower.
Description
Technical field
The present invention relates to a kind of NHD (NHD) desulfurizing system optimization extracting and concentrating new technology, relate in particular to a kind of H in the regeneration gas that makes
2S concentration reaches 〉=50% NHD desulfurizing system optimization extracting and concentrating technology.
Background technology
Coal is that the main energy sources of China constitutes, along with the continuous research and the deep exploitation of Coal Gasification Technology both at home and abroad in recent years, particularly anthracite rise in price, traditional fixed bed coal generating gas by the advanced person, adapt to the multifarious high-efficiency gasification mode of coal and replace, adopt the raw material of sulphur coal to become the direction of Coal Chemical Industry development.
Meanwhile, NHD desulfurization, decarburization technique Sulfur capacity height, technology is simple, energy consumption is low, is used widely at home, not only is applied to the desulfurization and the decarburization of syngas for synthetic ammonia, also gradually to other field expansion, for example H in the mists such as natural gas, fuel gas, synthesis gas
2S, CO
2, COS, hydrocarbon, alcohol etc. absorption.
In traditional NHD desulfurization process, its flash distillation flow process is set to as shown in Figure 1: flash tank I1 is connected with flash tank II2, and the gas after flash tank II2 separates goes back to system by desulfurization flash distillation machine, and rich solution then removes regenerator by compressor 3, reboiler 4.
There is following problem in above-mentioned flow process: the regenerator hear rate is higher; The flash distillation flow setting is not optimized, and hydrogen sulfide content is on the low side 25～35% in the regenerator outlet regeneration gas, and the system sulfur recovery rate of causing is only less than 85%, and atmosphere pollution is serious.
The content of invention
Purpose of the present invention is exactly low in order to solve present NHD desulphurization system flash process desulfurization degree, atmosphere pollution is serious, the regenerator hear rate is than problems such as height, provide that a kind of to have method easy, can realize environment protection treating, improve the cleaning system sulfur recovery rate, realize the polyethyleneglycol dimethyl ether desulfurizing system optimization extracting and concentrating technology of advantages such as product recovery and utilization of resources maximization purpose.
For achieving the above object, the present invention adopts following technical scheme:
A kind of polyethyleneglycol dimethyl ether desulfurizing system optimization extracting and concentrating technology, its method be,
1) the NHD solution rich solution that has absorbed hydrogen sulfide is sent into flash tank I;
2) flash tank I is connected with the gas phase inlet flashed vapour pipeline that is positioned at flash tank II gaseous phase outlet side;
3) rich solution sent of flash tank II is heated to the low-pressure flashing tank of sending into pressure＜30kPa gauge pressure after 90～130 ℃ through the rich solution heat exchanger, carries out high temperature decompression regeneration;
4) gas pressurized of low-pressure flashing tank outlet flashed vapour after water-cooled, separation is to the 50-150kPa gauge pressure, and consistent with pressure again flash tank II outlet flashed vapour mixes sends the concentration tower system back to after desulfurization flash distillation machine is forced into a little more than concentration tower pressure;
5) rich solution of low-pressure flashing tank is sent into regenerator and is regenerated.
In the described step 3), rich solution heat exchanger heating-up temperature is 100-120 ℃, low-pressure flashing tank pressure＜10kPa gauge pressure.
In the described step 4), low-pressure flashing tank outlet flashed vapour is pressurized to the 50-100kPa gauge pressure after water-cooled, separation, flash tank II outlet flashed vapour pressure is the 50-100kPa gauge pressure, and both send the concentration tower system back at mixing after desulfurization flash distillation machine is forced into a little more than concentration tower pressure.
The present invention utilizes NHD solution to hydrogen sulfide, CO
2Select absorbefacient characteristics, absorb under high pressure, low temperature, the characteristics of regenerating under high temperature, the low pressure concentrate gas in system, hydrogen sulfide are carried dense to 〉=50%.
The invention has the beneficial effects as follows: by second flash tank gas phase inlet flashed vapour pipeline is displaced to its gaseous phase outlet side, increase the flash distillation effect, effectively utilize the flash distillation space; Regenerative process has reduced flashing pressure, improves the flashed vapour temperature, improves the hydrogen sulfide content of going in the regenerator solution, and sour gas concentration is carried to more than 50%, increases sulfur recovery rate.
Description of drawings
Fig. 1 is the flash distillation flow chart in the existing technology;
Fig. 2 is a flash process flow chart of the present invention.
Wherein, 1. flash tank I, 2. flash tank II, 3. compressor, 4. reboiler, 5. heat exchanger, 6. low-pressure flashing tank, 7. water cooler, 8. flashed vapour compressor.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing and embodiment.
Flash process of the present invention is among Fig. 2:
The NHD solution rich solution that has absorbed hydrogen sulfide is sent into flash tank I1, and flash tank I1 is connected with the gas phase inlet flashed vapour pipeline that is positioned at flash tank II2 gaseous phase outlet side.Flash tank II2 gas phase inlet flashed vapour pipeline is displaced to its gaseous phase outlet side, increases the flash distillation space, strengthen the flash distillation effect, improve sour gas concentration.
Flash tank II2 export pipeline is communicated with heat exchanger 5, heat exchanger 5 is sent into low-pressure flashing tank 6 after the rich solution temperature is brought up to 90～130 ℃ (being preferably 100-120 ℃), the pressure of low-pressure flashing tank 6＜30kPa gauge pressure (best＜the 10kPa gauge pressure), portion finishes high temperature decompression regeneration within it.
The export pipeline one tunnel of low-pressure flashing tank 6 connects compressor 3, rich solution is sent into regenerator regenerate; Another road export pipeline is compressed to 50～150kPa gauge pressure (being preferably the 50-100kPa gauge pressure) with the flashed vapour of gained through water cooler 7 coolings, flashed vapour compressor 8, consistent with the pressure again flash tank II2 outlet flashed vapour that is similarly 50～150kPa gauge pressure (being preferably the 50-100kPa gauge pressure) mixes, and enters and sends system back to after desulfurization flash distillation machine pressurizes.
This flow process of regenerating further reduces flashing pressure, improves the flashed vapour temperature, improves the hydrogen sulfide content of going in the regenerator solution, and sour gas concentration is carried to 〉=50%, increases sulfur recovery rate.
Claims (3)
1, a kind of polyethyleneglycol dimethyl ether desulfurizing system optimization extracting and concentrating technology is characterized in that: its method is,
1) the NHD solution rich solution that has absorbed hydrogen sulfide is sent into flash tank I;
2) flash tank I is connected with the gas phase inlet flashed vapour pipeline that is positioned at flash tank II gaseous phase outlet side;
3) rich solution sent of flash tank II is heated to the low-pressure flashing tank of sending into pressure＜30kPa gauge pressure after 90～130 ℃ through the rich solution heat exchanger, carries out high temperature decompression regeneration;
4) gas pressurized of low-pressure flashing tank outlet flashed vapour after water-cooled, separation is to the 50-150kPa gauge pressure, and consistent with pressure again flash tank II outlet flashed vapour mixes sends the concentration tower system back to after desulfurization flash distillation machine is forced into a little more than concentration tower pressure;
5) rich solution of low-pressure flashing tank is sent into regenerator and is regenerated.
2, polyethyleneglycol dimethyl ether desulfurizing system optimization extracting and concentrating technology according to claim 1 is characterized in that: in the described step 3), rich solution heat exchanger heating-up temperature is 100-120 ℃, low-pressure flashing tank pressure＜10kPa gauge pressure.
3, polyethyleneglycol dimethyl ether desulfurizing system optimization extracting and concentrating technology according to claim 1, it is characterized in that: in the described step 4), low-pressure flashing tank outlet flashed vapour is pressurized to the 50-100kPa gauge pressure after water-cooled, separation, flash tank II outlet flashed vapour pressure is the 50-100kPa gauge pressure, and both send the concentration tower system back at mixing after desulfurization flash distillation machine is forced into a little more than concentration tower pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100158053A CN100518891C (en) | 2007-05-30 | 2007-05-30 | Polyethyleneglycol dimethyl ether desulfurizing system optimization extracting and concentrating technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100158053A CN100518891C (en) | 2007-05-30 | 2007-05-30 | Polyethyleneglycol dimethyl ether desulfurizing system optimization extracting and concentrating technology |
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| Publication Number | Publication Date |
|---|---|
| CN101077467A CN101077467A (en) | 2007-11-28 |
| CN100518891C true CN100518891C (en) | 2009-07-29 |
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| CNB2007100158053A Expired - Fee Related CN100518891C (en) | 2007-05-30 | 2007-05-30 | Polyethyleneglycol dimethyl ether desulfurizing system optimization extracting and concentrating technology |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115501734A (en) * | 2022-11-08 | 2022-12-23 | 山东兖矿国际焦化有限公司 | Desulfurization solution double-cooling device and method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0289620A1 (en) * | 1986-10-30 | 1988-11-09 | Toho Kagaku Kogyo Co. Ltd | Composition for acid gas absorbents |
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2007
- 2007-05-30 CN CNB2007100158053A patent/CN100518891C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0289620A1 (en) * | 1986-10-30 | 1988-11-09 | Toho Kagaku Kogyo Co. Ltd | Composition for acid gas absorbents |
Non-Patent Citations (10)
| Title |
|---|
| NHD气体净化技术. 林民鸿.化肥设计，第36卷第5期. 1998 |
| NHD气体净化技术. 林民鸿.化肥设计，第36卷第5期. 1998 * |
| NHD法脱硫脱碳净化技术. 林民鸿，张全文，胡新田.化学工业与工程技术，第16卷第3期. 1995 |
| NHD法脱硫脱碳净化技术. 林民鸿，张全文，胡新田.化学工业与工程技术，第16卷第3期. 1995 * |
| NHD法脱酸性气体的工业应用. 叶盛芳，张鸿林，吴永国，孙中耀.化肥设计，第39卷第1期. 2001 |
| NHD法脱酸性气体的工业应用. 叶盛芳，张鸿林，吴永国，孙中耀.化肥设计，第39卷第1期. 2001 * |
| NHD脱硫系统生产操作总结. 曹君国，孙岩，周广梅.化肥设计，第43卷第5期. 2005 |
| NHD脱硫系统生产操作总结. 曹君国，孙岩，周广梅.化肥设计，第43卷第5期. 2005 * |
| NHD脱硫装置在山东鲁南的使用情况. 叶盛芳，褚宏春，吴永国.煤化工，第4期. 1997 |
| NHD脱硫装置在山东鲁南的使用情况. 叶盛芳，褚宏春，吴永国.煤化工，第4期. 1997 * |
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| CN101077467A (en) | 2007-11-28 |
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Assignee: SHANDONG LUHUA TIANJIU CHEMICAL CO., LTD. Assignor: Yankuang Lunan Chemical Fertiliser Plant Contract fulfillment period: 2009.9.1 to 2015.8.31 contract change Contract record no.: 2009370000491 Denomination of invention: Polyethyleneglycol dimethyl ether desulfurizing system optimization extracting and concentrating technology Granted publication date: 20090729 License type: Exclusive license Record date: 2009.11.4 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.9.1 TO 2015.8.31; CHANGE OF CONTRACT Name of requester: SHANDONG LUHUA TIANJIU CHEMICAL INDUSTRY CO., LTD. Effective date: 20091104 |
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