CN202382515U - Cryogenic carbon dioxide (CO2) and methane (H2) separation device - Google Patents
Cryogenic carbon dioxide (CO2) and methane (H2) separation device Download PDFInfo
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- CN202382515U CN202382515U CN2011205069382U CN201120506938U CN202382515U CN 202382515 U CN202382515 U CN 202382515U CN 2011205069382 U CN2011205069382 U CN 2011205069382U CN 201120506938 U CN201120506938 U CN 201120506938U CN 202382515 U CN202382515 U CN 202382515U
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Abstract
The utility model relates to a carbon dioxide (CO2) and methane (H2) separation device and discloses a cryogenic CO2 and H2 separation device comprising a plate-fin heat exchanger which is used for cooling CO2 and H2 mixed gas, a high-pressure rectifying column, a separation device and a low-pressure rectifying column; the plate-fin heat exchanger, the high-pressure rectifying column, the separation device and the low-pressure rectifying column are sequentially connected through pipelines; and the low-pressure rectifying column is connected with the high-pressure rectifying column through the pipeline. According to the cryogenic CO2 and H2 separation device, the structure is compact, a process flow is simplified, the operation cost and the equipment investment cost are reduced, simultaneously energy consumption is reduced, so that the consumption of a large amount of energy required for the regeneration of lyosorption is prevented, a large amount of precipitated CO2 solid is removed through a filter method, the adding of heat for melting the CO2 solid is prevented, and the irreversible losses of a system are reduced.
Description
Technical field
The utility model relates to separating carbon dioxide (CO
2) and methane (H
2) device, related in particular to the device of a kind of cryogenic separation carbon dioxide and methane.
Background technology
Carbon dioxide is a kind of very valuable carbon resource, can be widely used in multiple field.The gas source of China's carbon dioxide is very abundant, especially contains great amount of carbon dioxide gas in some gas field.But it's a pity that very owing to reclaim taking effective measures of carbon dioxide, the amount of carbon dioxide of annual recycling had seldom both caused serious atmosphere pollution, formed fearful greenhouse effects, had wasted valuable carbon resource again.
The carbon dioxide gas method mainly contains activation MDEA method, separation by deep refrigeration in the separating natural gas gas field at present.
Activation MDEA method was the patent of German BASF AG, was applied to commercial production since 1970, and at present in the world covering device more than 90, the absorbent of this method being arranged is the MDEA aqueous solution, and content is 45 ~ 50%, and added 3% activator to increase the absorption rate of carbon dioxide.MDEA aqueous solution absorbing carbon dioxide process has the characteristics of Physical Absorption and chemical absorbing, the bicarbonate that generates behind the absorbing carbon dioxide, but thermal regeneration.The operating condition of this method is: absorption pressure < 12MPa; Partial pressure of carbon dioxide>0.05MPa; 50 ~ 90 ° of C of absorption temperature; Regeneration pressure 0.05 ~ 0.19MPa.This method can reach carbon dioxide purity>99.5%; Recovery rate of CO 2>99%; Carbon dioxide content is minimum in the purified gas can be to 5ppm.
Methane and carbon dioxide boiling point differ bigger, utilize Deep Cooling Method relatively goodly to separate on the principle, but because carbon dioxide freezes easily, in cryogenic separation, often block rectifying column easily, and separation can not be carried out continuously.In order to prevent to occur carbon dioxide solid in the distillation process, add liquid C3, C4 hydrocarbon in rectifying tower top, like this with regard to the drikold phenomenon of condensing not occurring, because the low temperature carbon dioxide more is soluble in C3, the C4 hydrocarbon.
The CFZ method is a kind of new technology of handling the high natural gas of acid gas-containing amount that U.S. XOM develops.Its advantage is the structure statement of account, and energy consumption is low with investment.Be lower than-100 magnificent degrees centigrade in temperature, methane content was greater than 80% o'clock, and carbon dioxide can not condense into solid, so two sections towers of this process using rectifying do not occur carrying out in the carbon dioxide solid interval at two respectively.So both can avoid carbon dioxide solid to stop up column plate, can obtain pure product again.
Activation MDEA method and C3, C4 solvent absorption all will be through solvent absorption and the cyclic process of regeneration, and energy consumption is higher during solvent reclamation.The CFZ method is through establishing a carbon dioxide solid fusion zone; Effectively solved the situation of carbon dioxide solid obstruction column plate; But melt solid carbon dioxide owing to will introduce one hot-fluid, therefore inevitably cause irreversible loss in CFZ tower solid melt zone.
Summary of the invention
The purpose of the utility model provides a kind of compact conformation, can simplify technological process, reduces operating cost and the cryogenic separation carbon dioxide of equipment investment cost and the device of methane.
In order to solve the problems of the technologies described above, the utility model is able to solve through following technical proposals:
The device of cryogenic separation carbon dioxide and methane; Comprise the plate-fin heat exchanger, high-pressure rectification tower, separator, the low-pressure distillation tower that are used for cooled carbon dioxide and methane blended gas; Plate-fin heat exchanger, high-pressure rectification tower, separator, low-pressure distillation tower connect through pipeline successively, link to each other with the high-pressure rectification tower through pipeline at the bottom of the low-pressure distillation Tata.
As preferably, described high-pressure rectification tower comprises the thermosyphon reboiler and the immersion plate-fin heat exchanger that is arranged at cat head that is arranged at the bottom of the tower.
As preferably; Described separator comprises gas-liquid separation device
and gas-liquid separation device
; The gaseous phase outlet of gas-liquid separation device
links to each other through pipeline
with the gaseous phase outlet of gas-liquid separation device
; The liquid phase outlet of gas-liquid separation device
links to each other through pipeline
with the liquid phase outlet of gas-liquid separation device
, and pipeline
is connected into low-pressure distillation tower respectively with pipeline
.Two cover separators switch to use, because the CO2 solid of separating out when stopping up, switches to another use, remove the device that stops up when one simultaneously.
As preferably, the pipeline between described low-pressure distillation tower and the high-pressure rectification tower is provided with pump.
Carbon dioxide and methane blended gas get into the high-pressure rectification tower after passing through plate-fin heat exchanger cooling and partial liquefaction, and in the high-pressure rectification tower, cat head obtains the lower methane liquid of purity, obtains the higher liquid of CO2 at the bottom of the tower.Then with getting into gas-liquid separation device behind the overhead liquid expenditure and pressure; At this moment have portion C O2 solid and separate out, leach solid portion, separation unit bottoms liquid and top gas are got into continuation separation in the low-pressure distillation tower; Obtain the higher methane gas of purity at cat head; At the bottom of tower, obtain methane and CO2 mixing material, methane and the CO2 mixing material with low pressure is pumped to the high-pressure tower tower top pressure then, and is back to high pressure cat head place.
The utility model has significant technique effect owing to adopted above technical scheme:
The utility model compact conformation; Can simplify technological process, reduce operating cost and equipment investment cost, reduce energy consumption simultaneously; Avoided the required significant amount of energy consumption of lyosoption regeneration; Adopt filtration method to remove the CO2 solid of separating out in a large number, avoided having reduced the irreversible loss of system for melting the heat that the CO2 solid adds.
Description of drawings
Fig. 1 is the syndeton sketch map of the utility model.
The specific embodiment
The utility model is described in further detail with embodiment below in conjunction with accompanying drawing 1:
Embodiment 1
The device of cryogenic separation carbon dioxide and methane; As shown in Figure 1; Comprise the plate-fin heat exchanger 1, high-pressure rectification tower 2, separator 3, the low-pressure distillation tower 4 that are used for cooled carbon dioxide and methane blended gas; Plate-fin heat exchanger 1, high-pressure rectification tower 2, separator 3, low-pressure distillation tower 4 connect through pipeline successively, link to each other with high-pressure rectification tower 2 through pipeline at the bottom of low-pressure distillation tower 4 towers.High-pressure rectification tower 2 comprises thermosyphon reboiler 21 that is arranged at the bottom of the tower and the immersion plate-fin heat exchanger 22 that is arranged at cat head.Separator 3 comprises gas-liquid separation device
31 and gas-liquid separation device
32; The gaseous phase outlet of gas-liquid separation device
31 links to each other through pipeline
33 with the gaseous phase outlet of gas-liquid separation device
32; The liquid phase outlet of gas-liquid separation device
31 links to each other through pipeline
34 with the liquid phase outlet of gas-liquid separation device
32; Pipeline
33 is connected into low-pressure distillation tower 4 respectively with pipeline
34, and the pipeline between low-pressure distillation tower 4 and the high-pressure rectification tower 2 is provided with pump 5.
Unstripped gas carbon dioxide and methane blended gas are through extremely-30 ℃ of plate-fin heat exchanger 1 back greenhouse coolings; Get into high-pressure rectification tower 2, in high-pressure rectification tower 2, cat head obtains the methane of purity 91.5%; Obtain the CO2 liquid of purity 99.5% at the bottom of the tower; The liquid of cat head gets into gas-liquid separation device through behind the expenditure and pressure, and said gas-liquid separation device is provided with two covers; Switch and use; In gas-liquid separation device
31, separate earlier, isolate solid product, gaseous products and liquid-phase product get into low-pressure distillation tower 4 respectively.
When solid volume among gas-liquid separation device
31 expires blocking channel; The die valve of 31 two sections of liquid separating apparatus
of pipe; Come products of separated through gas-liquid separation device
32, and solid among gas-liquid separation device
31 is reclaimed.
In low-pressure distillation tower 4, cat head obtains highly purified methane gas, and liquid is the CO2 liquid that is rich in methane at the bottom of the tower, and the still liquid that is rich in methane is forced into the high-pressure rectification tower top pressure with pump 5, and gets into high-pressure rectification tower 2, as overhead reflux liquid.
In a word, the above is merely the preferred embodiment of the utility model, and all equalizations of being done according to the utility model claim change and modify, and all should belong to the covering scope of the utility model patent.
Claims (4)
1. the device of cryogenic separation carbon dioxide and methane; Comprise the plate-fin heat exchanger (1), high-pressure rectification tower (2), separator (3), the low-pressure distillation tower (4) that are used for cooled carbon dioxide and methane blended gas; It is characterized in that: described plate-fin heat exchanger (1), high-pressure rectification tower (2), separator (3), low-pressure distillation tower (4) connect through pipeline successively, link to each other with high-pressure rectification tower (2) through pipeline at the bottom of low-pressure distillation tower (4) tower.
2. the device of cryogenic separation carbon dioxide according to claim 1 and methane is characterized in that: described high-pressure rectification tower (2) comprises the immersion plate-fin heat exchanger (22) that is arranged at the thermosyphon reboiler (21) at the bottom of the tower and is arranged at cat head.
3. the device of cryogenic separation carbon dioxide according to claim 1 and methane; It is characterized in that: described separator (3) comprises gas-liquid separation device
(31) and gas-liquid separation device
(32); The gaseous phase outlet of gas-liquid separation device
(31) links to each other through pipeline
(33) with the gaseous phase outlet of gas-liquid separation device
(32); The liquid phase outlet of gas-liquid separation device
(31) links to each other through pipeline
(34) with the liquid phase outlet of gas-liquid separation device
(32), and pipeline
(33) is connected into low-pressure distillation tower (4) respectively with pipeline
(34).
4. the device of cryogenic separation carbon dioxide according to claim 1 and methane is characterized in that: the pipeline between described low-pressure distillation tower (4) and the high-pressure rectification tower (2) is provided with pump (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205069382U CN202382515U (en) | 2011-12-08 | 2011-12-08 | Cryogenic carbon dioxide (CO2) and methane (H2) separation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205069382U CN202382515U (en) | 2011-12-08 | 2011-12-08 | Cryogenic carbon dioxide (CO2) and methane (H2) separation device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202382515U true CN202382515U (en) | 2012-08-15 |
Family
ID=46631012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205069382U Expired - Lifetime CN202382515U (en) | 2011-12-08 | 2011-12-08 | Cryogenic carbon dioxide (CO2) and methane (H2) separation device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202382515U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108151442A (en) * | 2017-12-04 | 2018-06-12 | 中国科学院理化技术研究所 | Low-temperature preparation system for L NG in raw material gas |
| CN109579433A (en) * | 2019-01-18 | 2019-04-05 | 成都深冷液化设备股份有限公司 | A kind of liquefied device and method of carbon dioxide purification |
-
2011
- 2011-12-08 CN CN2011205069382U patent/CN202382515U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108151442A (en) * | 2017-12-04 | 2018-06-12 | 中国科学院理化技术研究所 | Low-temperature preparation system for L NG in raw material gas |
| CN109579433A (en) * | 2019-01-18 | 2019-04-05 | 成都深冷液化设备股份有限公司 | A kind of liquefied device and method of carbon dioxide purification |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120815 |