CN103804237B - In a kind of reduction, press the method for ammonia content in air body and firing property thereof - Google Patents
In a kind of reduction, press the method for ammonia content in air body and firing property thereof Download PDFInfo
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- CN103804237B CN103804237B CN201410011039.3A CN201410011039A CN103804237B CN 103804237 B CN103804237 B CN 103804237B CN 201410011039 A CN201410011039 A CN 201410011039A CN 103804237 B CN103804237 B CN 103804237B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
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Abstract
The invention discloses in a kind of urea production the method that presses ammonia content in air body and firing property thereof in reducing, described method is included in middle pressure ammonia absorber bottom increases one deck packing material absorbing, in reduction, press the ammonia content in air body, and enter explosion limit to the nitrogen of continuous adding 2.2MPa in middle pressure ammonia absorber equipment to press air body in preventing. The ammonia content pressing in air body during process of the present invention makes reduces greatly, and ammonia organic efficiency is high, and operation is simple and reliable, and the liquid level of middle pressure inert gas scrubber is easy to stablize. Pass into nitrogen and can make the fuel gas hydrogen in emptying gas, the dividing potential drop of methane greatly reduce, thereby reduced its firing property, improved the security performance of device.
Description
Technical field
The present invention relates to urea production process method field, is the ammonia content that presses air body in reducing, Xiang ZhongPress in air body and pass into nitrogen to press the process program of firing property of air body in reducing.
Background technology
In urea production process, by urea synthesizer out contain first ammonium and unreacted reactant ammonia and carbon dioxideSolution through high, medium and low voltage, vapo(u)rization system decompose, concentrated, the fusing urea obtaining is sent to granulation tower granulation;The ammonia of recoveries at different levels and carbon dioxide are sent synthetic tower back to through absorption and are recycled.
In original urea production process, the fixed gas that contains saturated ammonia that leaves liquefied ammonia storage tank V-05 risesTo ammonia recovery tower (C-05), with the liquefied ammonia counter current contacting from battery limit (BL), to reclaim gas ammonia. Therefrom press ammonia to reclaimThe gas that discharge at tower (C-05) top enters middle pressure drop membrane type ammonia absorber (E-11), utilizes weak aqua ammonia to absorb gas phaseIn ammonia, the ammonia in gas phase is tentatively absorbed at this. Absorbing the heat producing has progressively increased the temperature of liquid phase,Therefore for gas ammonia is better absorbed. The cooling water that the heat dependence E-11 shell side that absorption produces provides willIt is removed.
Middle pressure inert gas scrubber (C-03) is arranged in pressure ammonia absorber (E-11) top, by four valve towersPlate composition. In inert gas, remaining ammonia components is done last washing absorption by pure desalted water, due to former designMiddle valve tower absorption efficiency is not high, and liquid level is set up difficulty, and the effect of desalted water scrubbing ammonia is poor, causes outlet to be putIn air body, ammonia content has reached 10%～20% even higher, has both wasted raw material ammonia, has polluted again large compression ringBorder.
In addition, in urea production process, need to add a small amount of passivation air to enter system, thereby stainlessSteel equipment surface forms oxide-film, is used for protection equipment and is not corroded. This process often adopts at raw material CO2In gas, add the way of air to realize. Part O2Form oxide layer, remaining is along with emptying gas is discharged.Meanwhile, raw material CO2When entering synthetic tower with liquefied ammonia, can bring part " inert substance " into. " inert substance "Be mixture, comprise H2、CH4、He、Ar、N2Deng, why be called as inert substance, be because of them notParticipate in the reaction of urea, therefore their understand emptying together with superfluous air. Washing these gases can bring again separatelyAn outer serious problem, that is exactly that, along with ammonia is absorbed, the content of all the other compositions can rise, likelyCan reach their explosion limit (as H2、CH4Deng).
In urea plant, the explosion limit of common combustible is as shown in the table:
Table 1 gas with various is in oxygen and airborne explosion limit
* these data cannot provide, and approach in practice the lower bound of blast. Every factor for safety, needsConsider this limit.
In mixture, contain definite inflammable component and mix with pure oxygen or dry air, if combustible component is denseDegree, in the listed scope of table 1, is referred to as " potential explosivity ".
The composition of normal urea plant emptying gas is outside blast area, but some abnormal situationCan occur, as adding of abnormal large quantity of air. Identical, if raw material CO2With the H in liquefied ammonia2And CH4Too high levels, also can make to drop a hint composition in deathtrap, increased its firing property.
Can be not dangerous by washing completely to make to drop a hint, as long as add lazy in gas phase mixtureProperty gas.
Summary of the invention
Object of the present invention is just to provide the method that presses ammonia content in air body and firing property thereof in reduction
The present invention is achieved by the following technical solutions:
In reducing in urea production, press a method for ammonia content in air body and firing property thereof, described method bagDraw together and increase one deck packing material absorbing (0.71m in middle pressure ammonia absorber bottom2Stainless steel Pall ring filler, specification: 38× 38 × 0.6mm), in reduction, press the ammonia content in air body, and connect in middle pressure ammonia absorber equipmentThe continuous nitrogen that adds 2.2MPa enters explosion limit to press air body in preventing.
Advantage of the present invention is:
In the former process of traditional urea production, in the ammonia content that presses in air body conventionally exist10-20%, had both wasted raw material ammonia, had polluted again atmosphere, in urea production process, needed conventionally because of corrosion-resistantIn feed carbon dioxide, add certain air, increased on-condensible gas hydrogen in medium voltage network emptying gas,The content of methane, has increased its firing property, and by using this method, the ammonia pressing in air body in can making containsAmount is down to zero, can also be by adding nitrogen to reduce the firing property of fuel gas;
The ammonia content pressing in air body during process of the present invention makes reduces greatly, and ammonia organic efficiency is high, behaviourDo simple and reliablely, the liquid level of middle pressure inert gas scrubber is easy to stablize. Passing into nitrogen can make in emptying gasThe dividing potential drop of fuel gas hydrogen, methane reduces greatly, thereby has reduced its firing property, has improved the security of deviceEnergy.
Brief description of the drawings:
Fig. 1 is operation chart of the present invention, in increasing, presses one section of packing material absorbing in ammonia absorber.
Embodiment
Example 1
A method that presses ammonia content in air body and firing property thereof in reducing in urea production, described method is included inMiddle pressure ammonia absorber (E-11) bottom increases one deck packing material absorbing (0.71m2Stainless steel Pall ring filler00Cr19Ni10, specification: 38 × 38 × 0.6mm), in reduction, press the ammonia content in air body, Yi JixiangIn middle pressure ammonia absorber equipment, the nitrogen of continuous adding 2.2MPa enters the blast utmost point to press air body in preventingLimit.
Claims (2)
1. in reducing in a urea production, press the method for ammonia content in air body and firing property thereof, described method is included in middle pressure ammonia absorber bottom increases one deck packing material absorbing, in reduction, press the ammonia content in air body, and enter explosion limit to the nitrogen of continuous adding 2.2MPa in middle pressure ammonia absorber equipment to press air body in preventing.
2. the method that presses ammonia content in air body and firing property thereof in reducing in a kind of urea production according to claim 1, is characterized in that described filler is 0.71m2Stainless steel Pall ring filler, specification is 38 × 38 × 0.6mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410011039.3A CN103804237B (en) | 2014-01-09 | 2014-01-09 | In a kind of reduction, press the method for ammonia content in air body and firing property thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410011039.3A CN103804237B (en) | 2014-01-09 | 2014-01-09 | In a kind of reduction, press the method for ammonia content in air body and firing property thereof |
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| Publication Number | Publication Date |
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| CN103804237A CN103804237A (en) | 2014-05-21 |
| CN103804237B true CN103804237B (en) | 2016-05-18 |
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| CN201410011039.3A Active CN103804237B (en) | 2014-01-09 | 2014-01-09 | In a kind of reduction, press the method for ammonia content in air body and firing property thereof |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5597454A (en) * | 1995-04-06 | 1997-01-28 | Lee; Jing M. | Process for producing urea |
| NL1020388C2 (en) * | 2002-04-15 | 2003-10-17 | Dsm Nv | Process for the preparation of urea. |
| CN101628883B (en) * | 2009-08-10 | 2012-05-30 | 四川金象赛瑞化工股份有限公司 | Urea mid pressure decomposing process adopting double heating-falling film countercurrent heat exchange |
| CN101624355B (en) * | 2009-08-10 | 2012-05-23 | 四川金象赛瑞化工股份有限公司 | Medium-pressure recovery process of low steam/carbon ratio-three-section adsorption-evaporative ammonia-cooling carbamide production |
| CN201485403U (en) * | 2009-08-10 | 2010-05-26 | 四川金象化工产业集团股份有限公司 | Urea medium pressure absorption tower |
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| C14 | Grant of patent or utility model | ||
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Method for reducing ammonia content and blasting property of medium-pressure emptying gas Effective date of registration: 20180417 Granted publication date: 20160518 Pledgee: Huizhou merchant bank, Hefei Taihu Road Branch Pledgor: CNSG Anhui Hong Sifang Co., Ltd. Registration number: 2018340000116 |
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