CN203890067U - Carbon dioxide purification device for producing urea - Google Patents
Carbon dioxide purification device for producing urea Download PDFInfo
- Publication number
- CN203890067U CN203890067U CN201420241326.9U CN201420241326U CN203890067U CN 203890067 U CN203890067 U CN 203890067U CN 201420241326 U CN201420241326 U CN 201420241326U CN 203890067 U CN203890067 U CN 203890067U
- Authority
- CN
- China
- Prior art keywords
- urea
- heat exchanger
- carbon dioxide
- separator
- line pipe
- 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
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Classifications
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Separation By Low-Temperature Treatments (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The utility model provides a carbon dioxide purification device for producing urea. A heat exchanger in the device is connected with the bottom of a cooler through a line pipe, wherein the top of the cooler is connected with a separator through a line pipe; the separator is connected with the heat exchanger through a line pipe, thus forming a circulating closed loop; and the heat exchanger is also connected with a steam heater through a line pipe. By liquefying compressed CO2, the heat exchanger and other devices separate out non-condensable inert gas components (H2, N2, CO, CH4 and the like) and heavy components such as oil and water. By adopting the device, on one hand, the concentration of the CO2 can be increased, the oil content in the CO2 gas is lowered, and the conversion rate of urea production and the product quality are effectively improved; on the other hand, the non-condensable inert gas components are separated, a CO2 dehydrogenation device in the traditional device can be concealed, the emission safety of urea high-pressure exhaust is guaranteed, and meanwhile, the separated non-condensable inert gas components can be recovered as raw materials of previous procedures.
Description
Technical field
The utility model relates to a kind of purifying carbon dioxide device for the production of urea, belongs to chemical industry equipment field.
Background technology
In urea production process, the height of carbon dioxide purity is directly connected to the stable of urea and economy operation, general requirement CO
2purity is greater than 95.7%, and purity is higher, and urea consumption is lower; Purity is lower, and urea consumption can increase considerably, and can cause system balancing to destroy when serious, cannot operate; And wherein contained wet goods heavy constituent carbonaceous organic material, by form fouling or carbon distribution under the hot environment of urea production, affects heat exchange efficiency, pollute again urea and reduce urea quality.
In tradition urea production, feed carbon dioxide need be passed through desulfurization, dehydrogenation operation, because of smart desulfurization and catalysis dehydrogenation reaction and follow-up high pressure loop equipment anticorrosion needs, need add the oxygen that accounts for total amount 0.5 ~ 1%, as number of patent application: CN01128500.1, " method of dehydrogenating of CO 2 raw material gas for synthesizing urea "; In adding air, again the rare gas element such as 79% nitrogen that accounts for air total amount is added wherein, to prevent that urea high-pressure system emptying end gas is within limits of explosion, thereby cause carbon dioxide gas purity to decline.And the raw material CO obtaining with pressure swing adsorption decarbonization flow process
2, concentration only 95 ~ 96%, after adding air, concentration is lower.
In above-mentioned traditional technology, in unstripped gas, removing of hydrogen need add oxygen, and under certain temperature, pressure environment, under noble metal catalyst effect, hydrogen and oxygen generate water, cause the waste of syngas for synthetic ammonia.
Reciprocating carbon dioxide gas gas compressor generally needs to inject a certain amount of lubricating oil in cylinder, to reduce the frictional coefficient between piston ring and cylinder body, improve the work-ing life of component, but also unavoidably cause can bringing a small amount of lubricating oil in carbon dioxide, if this part lubricating oil is brought in follow-up urea plant, can affect urea quality.
Summary of the invention
The utility model provides a kind of refining plant of the carbonic acid gas for the production of urea, and this device is applicable to CO
2for the urea production process of raw material, can effectively improve CO
2concentration, reduces CO
2oil-contg in gas, and can recycle hydrogen, the carbon monoxide etc. harmful to urea production.
For the production of a purifying carbon dioxide device for urea, heat exchanger via line pipeline is connected with water cooler bottom, and water cooler top via line pipeline is connected with separator, and separator via line pipeline is connected with heat exchanger, forms circulation closed circuit.Heat exchanger via line pipeline is also connected with steam heater.Separator top and bottom are provided with emptying pipe.
The utility model is achieved in that a kind of purifying carbon dioxide device for the production of urea, the CO after compressor compression
2gas, through interchanger, with the liquefaction CO after purification out from separator
2carry out heat exchange cooling, then through supercooler, reduce CO
2temperature to liquefying-point liquefies below, and the heavy constituent such as oil, water after liquefaction in carbonic acid gas is discharged and carbon dioxide separation from separator bottom, not solidifying rare gas element (H
2, N
2, CO and CH
4) discharge and reclaim from top; The pure carbonic acid gas of liquefaction from separator middle part out, then by interchanger, with the CO from carbon dioxide compressor
2gas carries out heat exchange, from interchanger out be the carbonic acid gas purification.
CO after compressor compression
2gas is the gas after smart desulfurization, pressure range 2.0 ~ 15.0MPa.
The noncondensable gas of discharging from separator top contains H
2, N
2, CO and CH
4, return to front operation as raw materials for production.
A kind of purifying carbon dioxide device for the production of urea that the utility model provides, its advantage is:
1, can effectively improve CO
2concentration.The present invention passes through CO
2liquefaction of gases, thus Separation and Recovery wherein profit and noncondensable gas component, can make CO
2concentration is promoted to more than 99.5%, and corresponding inert gas concentration is reduced to below 0.5%.According to " urea " (Yuan Yi chief editor), the every increase by 1% of inert gas content, transformation efficiency approximately reduces by 0.6%, and the present invention is reduced to foreign gas concentration below 0.5% from 1 ~ 7%, improves Synthesis conversion, reduces urea synthesis pressure, improves output, remarkable in economical benefits.This device is particularly suitable for the flow processs such as the pressure swing adsorption decarbonization that feed carbon dioxide concentration is not high.
2, for the urea technique that uses reciprocating carbon dioxide compressor, can reduce CO
2oil-contg in gas, the heat transfer efficiency of raising urea production equipment, promotes urea quality.
3, can simplify urea production process, remove CO
2dehydrogenation unit.Because hydrogen is insoluble in liquefied carbon dioxide, can from gas phase, separate, make CO
2in gas, hydrogen content is less than 100ppm, has ensured urea high-pressure exhaust emissions safety, and hydrogen can recycling.
4, the noncondensable gas (H that separator is separated
2, N
2, CO, CH
4deng) can deliver to the front operation recyclings such as decarburization, improve resource utilization; The wet goods heavy constituent that discharge bottom can be delivered to recovery of oil workshop section.
Brief description of the drawings
Fig. 1 is the refining plant structural representation for the production of the carbonic acid gas of urea, 1. heat exchanger, 2. water cooler, 3. separator, 4. steam heater.
Embodiment
For the production of a purifying carbon dioxide device for urea, heat exchanger 1 via line pipeline is connected with water cooler 2 bottoms, and water cooler 2 top via line pipelines are connected with separator 3, and separator 3 via line pipelines are connected with heat exchanger 1, forms circulation closed circuit.Heat exchanger 1 via line pipeline is also connected with steam heater 4.Separator 3 tops and bottom are provided with emptying pipe.
The purification process that adopts said apparatus to carry out carbonic acid gas is:
From the CO of the 14.5-15.0MPa of reciprocating carbon dioxide compressor
2gas, first through over-heat-exchanger 1, with from separator out liquid carbon dioxide carry out heat exchange, reduce temperature, then through supercooler 2, cool the temperature to-20 ~ 30 DEG C, after temperature reduces, liquefied carbon dioxide is stored in separator 3, and the carbonic acid gas proportion after liquefaction is at 400 ~ 900kg/m
3, oil wherein and water b are deposited on bottom, get rid of from separator 3 bottoms, and not solidifying rare gas element c, is mainly H
2, N
2, CO, CH
4deng, discharge and separate from top, liquefaction carbonic acid gas from separator 3 middle parts out, by heat exchanger 1, carry out heat exchange with the carbonic acid gas from carbon dioxide compressor, reclaim heat, the carbonic acid gas after purification passes through steam heater 4 again, be heated to 100-120 DEG C, send into Urea Conversion System.
Claims (3)
1. the purifying carbon dioxide device for the production of urea, it is characterized in that: heat exchanger (1) via line pipeline is connected with water cooler (2) bottom, water cooler (2) top via line pipeline is connected with separator (3), separator (3) via line pipeline is connected with heat exchanger (1), forms circulation closed circuit.
2. the purifying carbon dioxide device for the production of urea according to claim 1, is characterized in that: heat exchanger (1) via line pipeline is also connected with steam heater (4).
3. the purifying carbon dioxide device for the production of urea according to claim 1, is characterized in that: separator (3) top and bottom are provided with emptying pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420241326.9U CN203890067U (en) | 2014-05-13 | 2014-05-13 | Carbon dioxide purification device for producing urea |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420241326.9U CN203890067U (en) | 2014-05-13 | 2014-05-13 | Carbon dioxide purification device for producing urea |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203890067U true CN203890067U (en) | 2014-10-22 |
Family
ID=51716495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420241326.9U Expired - Fee Related CN203890067U (en) | 2014-05-13 | 2014-05-13 | Carbon dioxide purification device for producing urea |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203890067U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106368655A (en) * | 2016-10-27 | 2017-02-01 | 中国科学院力学研究所 | Low-temperature high-pressure liquid state CO2 replacement device and using method thereof |
-
2014
- 2014-05-13 CN CN201420241326.9U patent/CN203890067U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106368655A (en) * | 2016-10-27 | 2017-02-01 | 中国科学院力学研究所 | Low-temperature high-pressure liquid state CO2 replacement device and using method thereof |
| CN106368655B (en) * | 2016-10-27 | 2019-04-30 | 中国科学院力学研究所 | A kind of cryogenic high pressure liquid CO2Displacement apparatus and its application method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141022 Termination date: 20200513 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |