CN102502700B - Method for replacing catalyst of synthesis system - Google Patents
Method for replacing catalyst of synthesis system Download PDFInfo
- Publication number
- CN102502700B CN102502700B CN201110323084.9A CN201110323084A CN102502700B CN 102502700 B CN102502700 B CN 102502700B CN 201110323084 A CN201110323084 A CN 201110323084A CN 102502700 B CN102502700 B CN 102502700B
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- CN
- China
- Prior art keywords
- catalyst
- synthesis system
- gas
- carbon dioxide
- synthesis
- 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.)
- Expired - Fee Related
Links
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 39
- 238000003786 synthesis reaction Methods 0.000 title claims abstract description 39
- 239000003054 catalyst Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 15
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 11
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 11
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 5
- 238000007796 conventional method Methods 0.000 claims abstract description 5
- 238000006073 displacement reaction Methods 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 125000004122 cyclic group Chemical group 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 7
- 238000007599 discharging Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 9
- 235000011089 carbon dioxide Nutrition 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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- Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The invention belongs to the technical field of ammonia synthesls and relates to a method for replacing a catalyst of a synthesis system, which comprises the following steps: shutting down the synthesis system and closing an introduction air valve; utilizing previous synthesis recycle gas to cool down the catalyst to 250DEG C; shutting down a circulating machine and releasing pressure of the system; after releasing the pressure, introducing carbon dioxide gas into the synthesis system through a pre-converter air discharging opening of the synthesis system; starting the circulating machine and utilizing the carbon dioxide gas to carry out gas displacement of the system; and meanwhile, continuing to cool down the catalyst; and after a catalyst dismounting standard is met, shutting down the circulating machine, and replacing the catalyst according to a conventional method. The method provided by the invention has high operability, is easy to realize, and saves maintenance time.
Description
Technical field
The invention belongs to synthetic ammonia technical field, particularly relate to synthesis system in a kind of ammonia synthesis process and change the method for catalyst.
Background technology
What the synthesis system in the past in ammonia synthesis process changed catalyst is hydrogen and nitrogen gas, this method is not replaced system comprehensively, catalyst just just carries out removal with after hydrogen and nitrogen gas cooling, but when drawing off, occurring that some reasons cause unavoidably can not removal smoothly, remove overlong time, catalyst temperature rises, and then causes damage to a certain degree to synthesis system internals, and system will carry out getting angry, maintenance also needs again to replace, affect repair schedule, incur loss through delay and produce.
Summary of the invention
The object of this invention is to provide a kind of method that synthesis system changes catalyst, it is long that solution synthesis system changes the catalyst time, and the fragile problem of system internals, after using method of the present invention simultaneously, directly can also to get angry inspection to synthesis system, improve maintenance efficiency.
For achieving the above object, synthesis system of the present invention changes the method for catalyst, and step is as follows:
1), synthesis system stop, close import air valve;
2), ON cycle machine, utilize original synthetic cyclic gas to lower the temperature to catalyst, temperature will to 250 DEG C, stop circulator;
3), pressure release is carried out to synthesis system;
4), by drain before synthesis system tower to synthesis system transport of carbon dioxide gas;
5), ON cycle machine, utilize carbon dioxide to carry out gas displacement to synthesis system, simultaneously to catalyst continue cooling;
6), when detecting catalyst temperature be down to less than 100 DEG C, and when the carbon dioxide content of gas reaches more than 90% in synthesis system, stop circulator;
7) replacing of catalyst, is carried out according to a conventional method.
Method of the present invention is adopted to utilize carbonic acid gas to replace synthesis system; catalyst surface can be oxidized after carbonic acid gas runs into synthetic catalyst; making catalyst run into air at short notice can not oxidation heat liberation in a large number; internals are played a protective role; in addition because carbonic acid gas is replaced synthesis system; so system is got angry, maintenance need not carry out gas displacement again, directly can to get angry maintenance to system, ensure that maintenance safety.
Embodiment
Synthesis system of the present invention changes the method for catalyst, and step is as follows:
1), synthesis system stop, close import air valve;
2), ON cycle machine, utilize original synthetic cyclic gas to lower the temperature to catalyst, after temperature reaches 250 DEG C, stop circulator;
3), to system carry out pressure release, after pressure is unsnatched, open drain valve before tower;
4), by drain before synthesis system tower to synthesis system transport of carbon dioxide gas;
5), ON cycle machine, utilize carbon dioxide to carry out gas displacement to synthesis system, simultaneously to catalyst continue cooling;
6), when detecting catalyst temperature be down to less than 100 DEG C, and when the carbon dioxide content of gas reaches more than 90% in synthesis system, stop circulator;
7) replacing of catalyst, is carried out according to a conventional method;
8), also can to get angry maintenance to synthesis system according to a conventional method.
Claims (1)
1. in ammonia synthesis process, synthesis system changes a catalyst method, it is characterized in that: carry out according to the following steps:
1), synthesis system stop, close import air valve;
2), ON cycle machine, utilize original synthetic cyclic gas to lower the temperature to catalyst, temperature drops to 250 DEG C, stop circulator;
3), pressure release is carried out to synthesis system;
4), by drain before synthesis system tower to synthesis system transport of carbon dioxide gas;
5), ON cycle machine, utilize carbon dioxide to carry out gas displacement to synthesis system, simultaneously to catalyst continue cooling;
6), when detecting catalyst temperature be down to less than 100 DEG C, and when the carbon dioxide content of gas reaches more than 90% in synthesis system, stop circulator;
7) replacing of catalyst, is carried out according to a conventional method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110323084.9A CN102502700B (en) | 2011-10-21 | 2011-10-21 | Method for replacing catalyst of synthesis system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110323084.9A CN102502700B (en) | 2011-10-21 | 2011-10-21 | Method for replacing catalyst of synthesis system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102502700A CN102502700A (en) | 2012-06-20 |
| CN102502700B true CN102502700B (en) | 2014-12-24 |
Family
ID=46214851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110323084.9A Expired - Fee Related CN102502700B (en) | 2011-10-21 | 2011-10-21 | Method for replacing catalyst of synthesis system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102502700B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105817183B (en) | 2015-01-07 | 2018-04-13 | 万华化学集团股份有限公司 | A kind of method of optical self-encoding tower catalyst change |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6540971B2 (en) * | 2000-02-10 | 2003-04-01 | Haldor Topsoe A/S | Process and reactor for the preparation of ammonia |
-
2011
- 2011-10-21 CN CN201110323084.9A patent/CN102502700B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6540971B2 (en) * | 2000-02-10 | 2003-04-01 | Haldor Topsoe A/S | Process and reactor for the preparation of ammonia |
Non-Patent Citations (2)
| Title |
|---|
| 合成氨催化剂卸装及升温还原总结;李桂颖;《中氮肥》;20070930(第5期);第27-29页 * |
| 提温型氨合成双塔并联工艺触媒的更换;马富业;《化工设计通讯》;19970327;第23卷(第1期);第37-39页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102502700A (en) | 2012-06-20 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141224 Termination date: 20181021 |