CN202382518U - Device for washing and purifying synthesis gas with liquid nitrogen and cryogenically separating and recovering LNG (liquefied natural gas) - Google Patents
Device for washing and purifying synthesis gas with liquid nitrogen and cryogenically separating and recovering LNG (liquefied natural gas) Download PDFInfo
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- CN202382518U CN202382518U CN2011205222645U CN201120522264U CN202382518U CN 202382518 U CN202382518 U CN 202382518U CN 2011205222645 U CN2011205222645 U CN 2011205222645U CN 201120522264 U CN201120522264 U CN 201120522264U CN 202382518 U CN202382518 U CN 202382518U
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Abstract
The utility model discloses a device for washing and purifying synthesis gas with liquid nitrogen and cryogenically separating and recovering LNG (liquefied natural gas) the liquid nitrogen washing and purifying synthesis gas, belonging to the technical field of low-temperature cryogenic separation and purification. The device comprises a raw material gas pretreating system, a purifying and cryogenically separating cold tank and a mixed refrigerant refrigeration cycle system. Qualified synthesis gas is obtained by use of a nitrogen washing tower for washing a raw material gas in the cold tank system and then discharged out of the device after the cold quantity of the synthesis gas is recovered; and high-purity LNG liquid is obtained at the bottom of a rectifying tower and used as the product in a storage system after cold throttling. The separation system provided by the utility model replaces two independent systems in prior arts, namely a liquid nitrogen washing and purification system and an LNG liquefaction system, simultaneously achieves the purposes of synthesis gas purification and LNG recovery, reduces primary equipment investment and running cost, has stable operation, greatly prolongs a running period and has significant advantages especially for large-scale devices.
Description
Technical field
The utility model belongs to low-temperature deep isolation of purified technical field, has related in particular to a kind of scrubbing with liquid nitrogen and has purified synthesis gas and cryogenic separation recovery LNG device thereof.
Background technology
Ammonia is one of important inorganic chemical product, in national economy, occupies critical role.Except that liquefied ammonia directly the as fertilizer sources, the nitrogenous fertilizer that uses on the agricultural, for example urea, ammonium nitrate, ammonium phosphate, ammonium chloride and the various nitrogen composite fertilizer that contains all are raw material with ammonia.Synthetic ammonia is one of large chemical products, and the annual synthetic ammonia output in the world has reached more than 100,000,000 tons, wherein has 80% ammonia to be used for producing chemical fertilizer, 20% raw material as other chemical products approximately.
The purification of synthetic ammonia is used diverse ways according to the different mining of overall craft, and present flow process mostly adopts liquid nitrogen washing, and the gas that backflows after conventional liquid nitrogen washing will be washed goes out device as fuel gas, goes fuel gas system, and wherein the component change is bigger, and calorific value can't guarantee.Along with day being becoming tight of the energy, the methane benefit that reclaims in the fuel gas is obvious, and adopt again of device obtains liquefied natural gas with the fuel gas cryogenic separation of liquefying more at present.
The scrubbing with liquid nitrogen of the utility model purifies the system of synthesis gas and cryogenic separation recovery LNG thereof; When the liquid nitrogen washing purification obtains qualified synthesis gas, reclaim and obtain qualified liquefied natural gas, adopt same set of device; Reduce cost greatly; Synthesis gas goes out CO≤2PPM in the device, and the purity of liquefied natural gas is 99%, the rate of recovery " 95%.
Summary of the invention
It is low that the purpose of the utility model provides a kind of cost, and the ice chest apparatus arrangement is simple, and energy consumption is low, and heat exchanger efficiency is high, stable operation, and the scrubbing with liquid nitrogen that has prolonged the cycle of operation greatly purifies synthesis gas and cryogenic separation recovery LNG device thereof.
In order to solve the problems of the technologies described above, the utility model is able to solve through following technical proposals:
Scrubbing with liquid nitrogen purifies synthesis gas and the LNG device is reclaimed in cryogenic separation; Comprise that feed gas preprocessing system, cryogenic purification separate ice chest, azeotrope cooling cycle system; The feed gas preprocessing system comprises regeneration gas heaters, molecular sieve adsorber, regeneration gas cooler; Regeneration gas heaters, molecular sieve adsorber and regeneration gas cooler link to each other through pipeline successively; Said cryogenic purification separates ice chest and comprises main heat exchanger, knockout drum, nitrogen wash column, methane rectifying column and be arranged on the tower bottom reboiler in the methane rectifying column; Said main heat exchanger, knockout drum, nitrogen wash column, methane rectifying column connect through pipeline successively; Methane rectifying column top is connected into main heat exchanger through pipeline; Said azeotrope cooling cycle system comprises cryogen compensator, cryogen compressor, compressor one-level knockout drum, compressor secondary knockout drum, three grades of knockout drums of compressor and cooler, and said molecular sieve adsorber is connected through pipeline with main heat exchanger, and three grades of knockout drums of said compressor are connected through pipeline with main heat exchanger.
As preferably; Described cooler comprises compressor one-level cooler, compressor secondary coolers, three grades of coolers of compressor; The cryogen compressor comprises first order cryogen compressor, second level cryogen compressor, third level cryogen compressor, and said cryogen compensator, first order cryogen compressor, compressor one-level cooler, compressor one-level knockout drum, second level cryogen compressor, compressor secondary coolers, compressor secondary knockout drum, third level cryogen compressor, three grades of knockout drums of compressor connect through pipeline successively.
As preferably, be connected with cryogenic fluid pump on the described compressor secondary coolers.
As preferably, described tower bottom reboiler adopts thermal siphon formula evaporimeter.
The utility model has significant technique effect owing to adopted above technical scheme:
Adopt this nitrogen washing to purify the system that LNG is reclaimed in synthesis gas and cryogenic separation thereof, obtain clean synthesis gas at the nitrogen wash column top, synthesis gas goes out system after reclaiming cold and matching well nitrogen according to correct chemistry.Simultaneously with at the bottom of the nitrogen wash column tower with the separator tower at the bottom of the CH4 logistics that is rich in send into rectifying column, at the bottom of rectifying column, obtain highly purified liquefied natural gas, the rectifying column tower bottom reboiler adopts thermal siphon formula evaporimeter; Improved separating effect; Reduced ice chest apparatus arrangement difficulty, provided convenience for the device of big specification, thermal siphon formula evaporimeter is placed on heat exchanger the outside of rectifying column; Cut down the consumption of energy; Improve heat exchanger efficiency, also reduced ice chest apparatus arrangement difficulty simultaneously, making progress for the big specification of device provides convenience.
Description of drawings
Fig. 1 is that the device of the utility model connects sketch map.
The specific embodiment
The utility model is described in further detail with embodiment below in conjunction with accompanying drawing 1:
Embodiment 1
Scrubbing with liquid nitrogen purifies synthesis gas and the LNG device is reclaimed in cryogenic separation; As shown in Figure 1; Comprise that feed gas preprocessing system, cryogenic purification separate ice chest, azeotrope cooling cycle system; The feed gas preprocessing system comprises regeneration gas heaters 1, molecular sieve adsorber 2, regeneration gas cooler 3; Regeneration gas heaters 1, molecular sieve adsorber 2 and regeneration gas cooler 3 link to each other through pipeline successively; Said cryogenic purification separates ice chest and comprises main heat exchanger 4, knockout drum 5, nitrogen wash column 6, methane rectifying column 7 and be arranged on the thermal siphon formula evaporimeter 8 in the methane rectifying column 7; Said main heat exchanger 4, knockout drum 5, nitrogen wash column 6, methane rectifying column 7 connect through pipeline successively, and methane rectifying column 7 tops are connected into main heat exchanger 4 through pipeline, and said azeotrope cooling cycle system comprises cryogen compensator 9, cryogen compressor 10, compressor one-level knockout drum 11, compressor secondary knockout drum 12, three grades of knockout drums 13 of compressor and cooler; Said molecular sieve adsorber 2 and main heat exchanger 4 are connected through pipeline, and three grades of knockout drums 13 of said compressor and main heat exchanger 4 are connected through pipeline.
Cooler comprises compressor one-level cooler 141, compressor secondary coolers 142, three grades of coolers 143 of compressor; Cryogen compressor 10 comprises first order cryogen compressor 101, second level cryogen compressor 102, third level cryogen compressor 103, and said cryogen compensator 9, first order cryogen compressor 101, compressor one-level cooler 141, compressor one-level knockout drum 11, second level cryogen compressor 102, compressor secondary coolers 142, compressor secondary knockout drum 12, third level cryogen compressor 103, three grades of knockout drums 13 of compressor connect through pipeline successively.Be connected with cryogenic fluid pump 15 on the compressor secondary coolers 142.
Unstrpped gas after pretreatment system is handled is sent into 2 main heat exchangers in the ice chest successively; In this synthesis gas that is backflowed, fuel gas and azeotrope cooling; Get into knockout drum then and carry out gas-liquid separation, the back of continuing to be cooled of gas phase wherein gets into the nitrogen wash column bottom, wherein contained impurity as: carbon monoxide, argon and methane etc. are washed out by the liquid nitrogen that the top is come in nitrogen wash column; The synthesis gas that contains small amount of nitrogen after the purification leaves from the nitrogen wash column cat head; Through the main heat exchanger re-heat, allocate the nitrogen that comes in the high pressure nitrogen pipeline into (being that gas phase is joined nitrogen) then, reach hydrogen and nitrogen gas stoicheiometry 3:1 basically after; Wherein a part of synthesis gas leads to the low-temperature rectisol operation, returns the cold that is brought from the low-temperature rectisol operation by unstrpped gas; Another part synthesis gas continues cooling box after through main heat exchanger re-heat to environment temperature, and sends into the ammonia synthesis operation as product gas after joining the correct hydrogen of nitrogen realization, nitrogen stoicheiometry with converging from the synthesis gas after the re-heat of low-temperature rectisol operation through smart again.
High pressure nitrogen is from the air separation unit outside the battery limit (BL), and after main heat exchanger was backflowed gas cooled, wherein major part was directly mixed with the nitrogen gas washing that comes from the nitrogen wash column top through throttling, reaches hydrogen and nitrogen gas stoicheiometry 3:1 basically; Remainder continues cooling and liquefaction in main heat exchanger, and liquid nitrogen gets into the nitrogen wash column top, as washing agent, in nitrogen wash column, the impurity in the unstrpped gas is washed.
The liquid of knockout drum bottom and nitrogen wash column bottom gets into rectifying column through decompression; In rectifying column, separate; Obtain highly purified LNG at the bottom of the tower, the liquid of the gas phase of cat head and nitrogen wash column bottom returns the re-heat cooling box after the valve decompression, and pneumatic transmission to full factory fuel gas system acts as a fuel.
It is that system provides cold that the utility model adopts the azeotrope cooling cycle system.Azeotrope is made up of the mixture of N2 and C1～C5; Azeotrope after interstage cooler is cooled to 40 ℃, gets into the one-level knockout drum through the compression of the compressor first order subsequently, and gas phase partly gets into the azeotrope compressor second level and continues pressurization; After secondary coolers is cooled to 40 ℃, getting into the secondary knockout drum separates; Gas phase partly continues to get into the cryogen compressor pressurizes, and is cooled to 40 ℃ through aftercooler, gets into the final stage separator again and separates.Become to enter into the precooling zone of main heat exchanger after the liquid mixing that the liquid that the I and II separator comes out goes out with the final stage separator separates respectively after cryogenic fluid pump is got to certain pressure; Cross cold after choke valve throttling cooling at precooling zone; With turn back to precooling zone after the follow-up cryogen that backflows mixes and for this section cold be provided jointly, cooling unstripped gas, high pressure nitrogen, gaseous state cryogen and needed cold liquid refrigerant; The entering cold catch pot separated after the gaseous state cryogen entering main heat exchanger precooling zone that the final stage separator comes out cooled off, and turned back to main heat exchanger after liquid phase part continuation entering main heat exchanger is crossed cold and throttling is lowered the temperature with after the follow-up gas that backflows mixes, for this section provides cold; The gas phase part of cold catch pot is cooled to uniform temperature through main heat exchanger successively, after the choke valve throttling, becomes the gas that backflows again and gets into main heat exchanger, for this section provides cold.The low pressure azeotrope of in main heat exchanger, having participated in after the heat exchange gets into the azeotrope suction port of compressor through cryogen suction tank buffering back, so circulates repeatedly, for system purification and cryogenic separation provide cold.
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. scrubbing with liquid nitrogen purifies synthesis gas and cryogenic separation recovery LNG device thereof; Comprise that feed gas preprocessing system, cryogenic purification separate ice chest, azeotrope cooling cycle system; It is characterized in that: described feed gas preprocessing system comprises regeneration gas heaters (1), molecular sieve adsorber (2), regeneration gas cooler (3); Regeneration gas heaters (1), molecular sieve adsorber (2) and regeneration gas cooler (3) link to each other through pipeline successively; Said cryogenic purification separates ice chest and comprises main heat exchanger (4), knockout drum (5), nitrogen wash column (6), methane rectifying column (7) and be arranged on the tower bottom reboiler (8) in the methane rectifying column (7); Said main heat exchanger (4), knockout drum (5), nitrogen wash column (6), methane rectifying column (7) connect through pipeline successively; Methane rectifying column (7) top is connected into main heat exchanger (4) through pipeline; Said azeotrope cooling cycle system comprises cryogen compensator (9), cryogen compressor (10), compressor one-level knockout drum (11), compressor secondary knockout drum (12), three grades of knockout drums of compressor (13) and cooler; Said molecular sieve adsorber (2) is connected through pipeline with main heat exchanger (4), and three grades of knockout drums of said compressor (13) are connected through pipeline with main heat exchanger (4).
2. scrubbing with liquid nitrogen according to claim 1 purifies synthesis gas and the LNG device is reclaimed in cryogenic separation; It is characterized in that: described cooler comprises compressor one-level cooler (141), compressor secondary coolers (142), three grades of coolers of compressor (143); Cryogen compressor (10) comprises first order cryogen compressor (101), second level cryogen compressor (102), third level cryogen compressor (103), and said cryogen compensator (9), first order cryogen compressor (101), compressor one-level cooler (141), compressor one-level knockout drum (11), second level cryogen compressor (102), compressor secondary coolers (142), compressor secondary knockout drum (12), third level cryogen compressor (103), three grades of knockout drums of compressor (13) connect through pipeline successively.
3. scrubbing with liquid nitrogen according to claim 1 and 2 purifies synthesis gas and the LNG device is reclaimed in cryogenic separation, it is characterized in that: be connected with cryogenic fluid pump (15) on the described compressor secondary coolers (142).
4. scrubbing with liquid nitrogen according to claim 1 purifies synthesis gas and the LNG device is reclaimed in cryogenic separation, it is characterized in that: described tower bottom reboiler (8) adopts thermal siphon formula evaporimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205222645U CN202382518U (en) | 2011-12-14 | 2011-12-14 | Device for washing and purifying synthesis gas with liquid nitrogen and cryogenically separating and recovering LNG (liquefied natural gas) |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205222645U CN202382518U (en) | 2011-12-14 | 2011-12-14 | Device for washing and purifying synthesis gas with liquid nitrogen and cryogenically separating and recovering LNG (liquefied natural gas) |
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| CN202382518U true CN202382518U (en) | 2012-08-15 |
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| CN2011205222645U Expired - Lifetime CN202382518U (en) | 2011-12-14 | 2011-12-14 | Device for washing and purifying synthesis gas with liquid nitrogen and cryogenically separating and recovering LNG (liquefied natural gas) |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435045A (en) * | 2011-12-14 | 2012-05-02 | 杭州中泰深冷技术股份有限公司 | Liquid nitrogen washing purified synthetic gas and device for cryogenically separating and recovering LNG (liquefied natural gas) thereof |
| CN105066586A (en) * | 2015-09-14 | 2015-11-18 | 成都深冷液化设备股份有限公司 | Device and method for preparing synthetic ammonia raw material gas and LNG through liquid nitrogen washing |
| CN105157348A (en) * | 2015-08-17 | 2015-12-16 | 杭州中泰深冷技术股份有限公司 | Liquid nitrogen washing device for recycling LNG and method for liquid nitrogen washing device |
| CN106871576A (en) * | 2017-01-25 | 2017-06-20 | 北京三泰天洁气体净化技术有限公司 | Commercial syngas low temperature front-end demethanization method and system |
-
2011
- 2011-12-14 CN CN2011205222645U patent/CN202382518U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435045A (en) * | 2011-12-14 | 2012-05-02 | 杭州中泰深冷技术股份有限公司 | Liquid nitrogen washing purified synthetic gas and device for cryogenically separating and recovering LNG (liquefied natural gas) thereof |
| CN105157348A (en) * | 2015-08-17 | 2015-12-16 | 杭州中泰深冷技术股份有限公司 | Liquid nitrogen washing device for recycling LNG and method for liquid nitrogen washing device |
| CN105157348B (en) * | 2015-08-17 | 2017-06-23 | 杭州中泰深冷技术股份有限公司 | The liquid nitrogen washing device and its method of a kind of recovery LNG |
| CN105066586A (en) * | 2015-09-14 | 2015-11-18 | 成都深冷液化设备股份有限公司 | Device and method for preparing synthetic ammonia raw material gas and LNG through liquid nitrogen washing |
| CN106871576A (en) * | 2017-01-25 | 2017-06-20 | 北京三泰天洁气体净化技术有限公司 | Commercial syngas low temperature front-end demethanization method and system |
| CN106871576B (en) * | 2017-01-25 | 2019-08-09 | 北京三泰天洁气体净化技术有限公司 | Commercial syngas low temperature front-end demethanization method and system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120815 |
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| CX01 | Expiry of patent term |