CN206642544U - Decarburization deamination system - Google Patents
Decarburization deamination system Download PDFInfo
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- CN206642544U CN206642544U CN201720413370.7U CN201720413370U CN206642544U CN 206642544 U CN206642544 U CN 206642544U CN 201720413370 U CN201720413370 U CN 201720413370U CN 206642544 U CN206642544 U CN 206642544U
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- gas
- decarburization
- absorbing cylinder
- deamination system
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Abstract
It the utility model is related to a kind of decarburization deamination system, for carrying out decarburization to the unstripped gas that gained is handled by chemical industry tail gas, deamination processing, to obtain the rectifying unstripped gas of input LNG rectifying columns, decarburization deamination system includes several built-in sorbents and alternately carbon dioxide and the absorbing cylinder of ammonia absorption, the regenerative system that regeneration gas carries out adsorbent reactivation is passed through into absorbing cylinder, decarburization deamination system also includes LNG storage tank, boil-off gas in LNG storage tank is respectively fed to carry out gas displacement and the air delivering pipeline pressed to regeneration gas in each absorbing cylinder, the compressor being arranged on air delivering pipeline, it is arranged on air delivering pipeline and control valve corresponding with each absorbing cylinder.Decarburization deamination system of the present utility model carries out regeneration gas displacement to absorbing cylinder and pressed by using the boil-off gas of LNG storage tank, can avoid its output gas that flow and nitrogen content fluctuation occurs, and then avoid influenceing the normal work of follow-up system.
Description
Technical field
It the utility model is related to a kind of be used for the unstripped gas by chemical industry tail gas processing gained carries out decarburization, deamination is handled
System.
Background technology
Chemical industry tail gas extracts ammonia after de-oiling, dechlorination purification, then by ammonia liquefaction system, contains in caused gas component
A small amount of ammonia（~0.45%）And micro carbon dioxide, form more pure unstripped gas.If ammonia and carbon dioxide should be contained
Unstripped gas enters follow-up low temperature LNG rectifying columns, then ammonia and carbon dioxide therein are frozen in LNG fractionation because boiling point is higher
In the plate-fin heat exchanger of tower, so as to block the passage in plate-fin heat exchanger.Therefore unstripped gas don't fail to be removed before rectifying
In ammonia and carbon dioxide, that is, carry out decarburization deamination processing.
The operation principle of the decarburization deamination processing used at present is that unstripped gas is sent into the absorbing cylinder of decarburization deamination system
In, the adsorbent that ammonia and carbon dioxide in unstripped gas are adsorbed installing in cylinder absorbs, so as to reach clean-up effect to unstripped gas.
After absorbing cylinder works a cycle, adsorbent therein saturation, it is impossible to adsorbed again, at this time, it may be necessary to by high temperature again
It is angry that thermal regeneration is carried out to adsorbent, adsorb the ammonia in adsorbent and carbon dioxide departs from adsorbent at high temperature, afterwards
Regeneration gas enters regeneration Gas Cooler, and regeneration gas after cooling is sent into deamination adsorption tower.Contained in deamination adsorption tower certain
The water of amount, because ammonia is highly soluble in water, then go to be vented except the regeneration gas after deammoniation can be discharged into diffusing tower by ammonia adsorption tower.
Adsorbent temperature after regeneration is higher, therefore needs to carry out cold blowing to the adsorbent in absorbing cylinder, when temperature reduces to a certain extent
Afterwards, the absorbing cylinder can just be adsorbed again.
Above-mentioned this decarburization deamination system has problems in that：
1st, regeneration gas uses nitrogen mostly so that has a large amount of nitrogen in the absorbing cylinder after regeneration.When what is regenerated
After absorbing cylinder comes into operation, the methane in unstripped gas can displace the nitrogen adsorbed in adsorbent, cause absorbing cylinder to export mixed
Nitrogen content increase in gas is closed, and methane content reduces.Enter LNG rectifying columns when the mixed gas turns into rectifying unstripped gas
Afterwards, because nitrogen content increase, condensing temperature reduce, LNG rectifying columns in a short time can not liquefy the mixed gas so that
The flow rapid fluctuation of rectifying unstripped gas, maximum stream flow can be by 14000Nm3/ h is reduced to 8000Nm3/h；
2nd, because the thermal source of rectifier bottoms evaporation is rectifying unstripped gas, the flow of rectifying unstripped gas, Degree of Liquefaction, liquefaction
The rapid fluctuation of amount can cause rectifier bottoms thermic load to fluctuate so that the fluctuation of LNG purity is larger, can be reduced to 85% by 98%；
3rd, in order to realize that the pressure in absorbing cylinder is adjusted, gas caused by an absorbing cylinder absorption need to be separated one and sent
Enter to do in another absorbing cylinder and press so that the tolerance of absorbing cylinder output is reduced, and influences follow-up rectifying；
4th, follow-up ar system will also be influenceed and unstable by distillation system, and gas purity fluctuates.
The content of the invention
The purpose of this utility model is to provide a kind of decarburization deamination system for being capable of stabilizing gas flux and purity.
To reach above-mentioned purpose, the technical solution adopted in the utility model is：
A kind of decarburization deamination system, for carrying out decarburization, deamination processing to the unstripped gas that gained is handled by chemical industry tail gas, with
The rectifying unstripped gas of input LNG rectifying columns is obtained, the decarburization deamination system includes several built-in sorbents and alternately
Carbon dioxide and the absorbing cylinder of ammonia absorption, the regenerative system that regeneration gas carries out adsorbent reactivation, institute are passed through into the absorbing cylinder
Stating decarburization deamination system also includes LNG storage tank, the boil-off gas in the LNG storage tank is respectively fed in each absorbing cylinder to institute
State regeneration gas carry out gas displacement and press air delivering pipeline, be arranged on the air delivering pipeline compressor, be arranged at described in
On air delivering pipeline and control valve corresponding with each absorbing cylinder.
Preferably, the decarburization deamination system is also exported to detect its discharge including being arranged at the regeneration gas of the absorbing cylinder
The detection means of nitrogen content in gas.
Preferably, the liquid outlet of the LNG rectifying columns is connected to the LNG storage tank.
Preferably, the absorbing cylinder is connected with the vacuum pumping pump for extracting wherein gas out.
Preferably, it is provided with cooler between the decarburization deamination system and the LNG rectifying columns.
Because above-mentioned technical proposal is used, the utility model has following advantages compared with prior art：The utility model
Decarburization deamination system by using the boil-off gas of LNG storage tank come to absorbing cylinder carry out regeneration gas displacement and press, can avoid
Flow and nitrogen content fluctuation occur for its output gas, and then avoid influenceing the normal work of follow-up system.
Brief description of the drawings
Accompanying drawing 1 is the principle schematic of decarburization deamination system of the present utility model.
In the figures above：1st, absorbing cylinder；2nd, LNG storage tank；3rd, air delivering pipeline；4th, compressor；5th, control valve.
Embodiment
Shown embodiment is further described to the utility model below in conjunction with the accompanying drawings.
Embodiment one：As shown in Figure 1, chemical industry tail gas extracts after de-oiling, dechlorination purification, then by ammonia liquefaction system
Ammonia, contain a small amount of ammonia in caused gas component（~0.45%）And micro carbon dioxide, form more pure unstripped gas.
The unstripped gas first passes through decarburization deamination system and goes out to form rectifying unstripped gas after carbon dioxide and ammonia.The rectifying unstripped gas is re-fed into
Rectifying is carried out in LNG rectifying columns, rectifying output gas and LNG can be produced.
Decarburization deamination system be sent into LNG rectifying columns rectifying unstripped gas flow and purity, will have influence on rectifying and after
Continuous technique, therefore need to reduce the flow of rectifying unstripped gas and purity fluctuation.Therefore, decarburization deamination system uses following scheme：
Decarburization deamination system includes multiple absorbing cylinders 1, regenerative system.It is provided with absorbing cylinder 1 for absorbing carbon dioxide
With the adsorbent of ammonia.Multiple absorbing cylinders 1 alternately carry out the absorption of carbon dioxide and ammonia to unstripped gas.Regenerative system is used for each suction
It is passed through regeneration gas in attached cylinder 1 and carries out adsorbent reactivation, when an absorbing cylinder 1 is after the absorption of a cycle, regenerative system
Nitrogen is passed through into the absorbing cylinder 1 to be regenerated.
In addition, the decarburization deamination system also includes the gas transmission between LNG storage tank 2, connection LNG storage tank 2 and each absorbing cylinder 1
Pipeline 3, compressor 4 and multiple control valves 5.LNG is stored in LNG storage tank 2, and boil-off gas BOG, gas transmission can be formed in tank
Boil-off gas BOG in LNG storage tank 2 can be respectively fed in each absorbing cylinder 1 by pipeline 3, so as to in the absorbing cylinder 1 after regeneration
Regeneration gas carries out gas displacement and pressed.Control valve 5 is arranged on air delivering pipeline 3, and corresponding with each absorbing cylinder 1, so as to
It can control whether to supply gas into its corresponding absorbing cylinder 1 by the control valve 5.Compressor 4 is arranged on air delivering pipeline 3, is used
Driving force is provided in being flowed for BOG gases therein.Decarburization deamination system also includes multiple detections that can detect nitrogen content
Device, they are separately positioned on the regeneration gas outlet of each absorbing cylinder 1, so as to the regeneration gas outlet institute for detecting absorbing cylinder 1
Discharge nitrogen content in gas.The regeneration gas outlet of absorbing cylinder 1 is also associated with the vacuum pumping pump for extracting wherein gas out.It is de-
Cooler is provided between carbon deamination system and LNG rectifying columns.The liquid outlet of LNG rectifying columns is connected to LNG storage tank 2.
The workflow of above-mentioned decarburization deamination system is：Absorbing cylinder 1 adsorbs to unstripped gas, when its work a cycle
Afterwards, high temperature nitrogen is passed through thereto by regenerative system to be regenerated to adsorbent therein.After regeneration, pass through air delivering pipeline
3rd, compressor 4 and control valve 5, the gas boosting after the internal gasifier of LNG storage tank 2 is sent into absorbing cylinder 1 to absorbent interior
Nitrogen enters line replacement, repeatedly can inflate and bleed off into absorbing cylinder 1, and institute's deflation body is detected by detection means when deflating every time
The content of middle nitrogen, when nitrogen content is reduced to desirable value, you can gas displacement process is completed, can be by taking out during this
Vavuum pump will regenerate remaining nitrogen in the absorbing cylinder 1 finished and extract out.Avoid remaining nitrogen to subsequent fine through the above way
The influence evaporated.Then proceed to be filled with the boil-off gas BOG of LNG storage tank 2 into absorbing cylinder 1, reaching the air pressure in absorbing cylinder 1 will
Ask, complete pressure equalizing.Absorbing cylinder after completing uniformly can be put into absorption work again.It is increased after decarburization deamination system
One cooler, it is possible to reduce gas absorption heat up and to the influence of follow-up distillation system.
The advantages of above-mentioned decarburization deamination system, is：Caused BOG gases are evaporated using LNG storage tank 2 to carry out absorbing cylinder 1
Gas displacement and press, pressed without separating one by the gas of other outputs of absorbing cylinder 1, decarburization can also be avoided
Nitrogen content increase in the gas of deamination system output, so as to avoid the flow and nitrogen of decarburization deamination system output gas
The fluctuation of content, reduce the influence to follow-up each system.
For above-described embodiment only to illustrate technical concepts and features of the present utility model, its object is to allow be familiar with technique
Personage can understand content of the present utility model and implement according to this, the scope of protection of the utility model can not be limited with this.
All equivalent change or modifications made according to the utility model Spirit Essence, should all cover the scope of protection of the utility model it
It is interior.
Claims (5)
- A kind of 1. decarburization deamination system, for carrying out decarburization, deamination processing to the unstripped gas that gained is handled by chemical industry tail gas, to obtain The rectifying unstripped gas of LNG rectifying columns must be inputted, the decarburization deamination system includes several built-in sorbents and alternately two Carbonoxide and the absorbing cylinder of ammonia absorption, the regenerative system that regeneration gas carries out adsorbent reactivation is passed through into the absorbing cylinder, it is special Sign is：The decarburization deamination system also includes LNG storage tank, the boil-off gas in the LNG storage tank is respectively fed into each suction In attached cylinder to the regeneration gas carry out gas displacement and press air delivering pipeline, be arranged on the air delivering pipeline compressor, It is arranged on the air delivering pipeline and control valve corresponding with each absorbing cylinder.
- 2. decarburization deamination system according to claim 1, it is characterised in that：The decarburization deamination system also includes being arranged at The regeneration gas of the absorbing cylinder exports discharges the detection means of nitrogen content in gas to detect it.
- 3. decarburization deamination system according to claim 1 or 2, it is characterised in that：The liquid outlet of the LNG rectifying columns connects It is connected to the LNG storage tank.
- 4. decarburization deamination system according to claim 1 or 2, it is characterised in that：The absorbing cylinder is connected with for extracting out The wherein vacuum pumping pump of gas.
- 5. decarburization deamination system according to claim 1 or 2, it is characterised in that：The decarburization deamination system and the LNG Cooler is provided between rectifying column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720413370.7U CN206642544U (en) | 2017-04-19 | 2017-04-19 | Decarburization deamination system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720413370.7U CN206642544U (en) | 2017-04-19 | 2017-04-19 | Decarburization deamination system |
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| CN206642544U true CN206642544U (en) | 2017-11-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106943837A (en) * | 2017-04-19 | 2017-07-14 | 苏州市兴鲁空分设备科技发展有限公司 | Decarburization deamination system |
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2017
- 2017-04-19 CN CN201720413370.7U patent/CN206642544U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106943837A (en) * | 2017-04-19 | 2017-07-14 | 苏州市兴鲁空分设备科技发展有限公司 | Decarburization deamination system |
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