Method and device for purifying ammonia synthesis virgin gas and co-generating SNG (synthetic natural gas) or/and LNG (liquefied natural gas) via liquid nitrogen washing

A fresh gas and liquid nitrogen washing technology, applied in chemical instruments and methods, liquid washing gas purification, combustible gas purification/transformation, etc.

Active Publication Date: 2013-05-29
SHANGHAI INT ENG CONSULTING
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0010] One of the technical problems to be solved by the present invention is to provide a liquid nitrogen washing purification preparation ammonia synthesis method for the problems existing in the low-temperature liquid nitrogen washing process in the existing coke oven gas or LURGI furnace / BGL furnace gasification and production synthetic ammonia process. The method of co-producing SNG with fresh gas in parallel. This method removes CO, Ar, CH4 and other impurities and inert gases through the low-temperature liquid nitrogen washing section to purify ammonia and synthesize fresh gas, and adjust the hydrogen-nitrogen ratio to meet the requirements of the ammonia synthesis process for fresh gas. Through the reasonable configuration of the methane rectification tower in the process, the production of high-yield SNG and high-pressure gas that meets relevant standards can be achieved under the condition of low energy consumption
[0011] The second technical problem to be solved by the present invention is to provide liquid nitrogen washing, purification, preparation of ammonia synthesis fresh gas and The method of co-production of LNG, this method removes CO, Ar, CH4 and other impurities and inert gases through the low-temperature liquid nitrogen washing section to purify the ammonia synthesis fresh gas, adjust the hydrogen-nitrogen ratio to meet the requirements of the synthesis ammonia process for fresh gas, and pass the methane The rational configuration of the rectification tower in the process can achieve high yield production of LNG and high-pressure gas that meet relevant standards under the condition of low energy consumption
[0012] The third technical problem to be solved by the present invention is to provide liquid nitrogen washing, purification, preparation of ammonia synthesis fresh gas and The method of co-production of SNG and LNG, this method removes CO, Ar, CH4 and other impurities and inert gases through the low-temperature liquid nitrogen washing section to prepare ammonia synthesis fresh gas, adjust the hydrogen-nitrogen ratio to meet the requirements of the ammonia synthesis process for fresh gas, through Reasonable configuration of the methane distillation tower in the process to achieve high-yield production of SNG, LNG and high-pressure gas that meet relevant standards under the condition of low energy consumption

Method used

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  • Method and device for purifying ammonia synthesis virgin gas and co-generating SNG (synthetic natural gas) or/and LNG (liquefied natural gas) via liquid nitrogen washing
  • Method and device for purifying ammonia synthesis virgin gas and co-generating SNG (synthetic natural gas) or/and LNG (liquefied natural gas) via liquid nitrogen washing
  • Method and device for purifying ammonia synthesis virgin gas and co-generating SNG (synthetic natural gas) or/and LNG (liquefied natural gas) via liquid nitrogen washing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] see Figure 4 , Figure 4 A flow chart of a device for preparing ammonia to synthesize fresh gas and co-producing SNG is given.

[0099] The liquid nitrogen washing and purifying device for preparing ammonia to synthesize fresh gas for co-production of SNG and high-pressure gas includes heat exchangers 100, 200, 300, nitrogen washing tower 400, methane rectification tower 500, and methane rectification tower top condenser 600 , methane rectification tower bottom reboiler 700, feed gas flash tank 800, CO rich liquid tank 900, liquid methane pump 1000, methane rectification tower reflux tank 1500.

[0100] The nitrogen compressor 1100 connected to the air separation is connected to the condensation inlet 120 of the heat exchanger 100 through the high-pressure nitrogen delivery pipe 10, and one end of the high-pressure nitrogen delivery pipe 11 is connected to the condensation outlet 121 of the heat exchanger 100, and the condensation inlet 120 is connected to the condens...

Embodiment 2

[0125] see Figure 5 , Figure 5 A flow chart of another device for preparing ammonia to synthesize fresh gas and co-producing SNG is given.

[0126] The difference between this embodiment and Embodiment 1 is: the other end of the high-pressure nitrogen delivery pipe 12 is divided into two strands, one high-pressure nitrogen delivery pipe 12a is connected to the condensation inlet 320 of the heat exchanger 300, and the other high-pressure nitrogen delivery pipe 12b It is directly connected with the fresh air delivery pipe 51. The condensation outlet 321 of the heat exchanger 300 only separates the high-pressure and low-temperature liquid nitrogen delivery pipe 20 , and does not separate the high-pressure and low-temperature liquid nitrogen delivery pipe 21 . The heat exchanger 300 lacks the reheating inlets 330, 340 and the reheating outlet 341, and the liquid phase delivery pipe 41 is directly connected with the liquid phase delivery connection pipe 43 to form a direct conn...

Embodiment 3

[0129] see Image 6 , Image 6 A flow chart of a device for preparing ammonia to synthesize fresh gas and co-producing LNG with liquid nitrogen washing and purification is given.

[0130] The device for washing and purifying ammonia to synthesize fresh gas for co-production of LNG and high-pressure gas with liquid nitrogen, including heat exchangers 100, 200, 300, nitrogen washing tower 400, methane rectification tower 500, and methane rectification tower overhead condenser 600 , methane rectification tower bottom reboiler 700, feed gas flash tank 800, CO rich liquid tank 900, liquid methane pump 1000, methane rectification tower reflux tank 1500.

[0131] The nitrogen compressor 1100 connected to the air separation is connected to the condensation inlet 120 of the heat exchanger 100 through the high-pressure nitrogen delivery pipe 10, and one end of the high-pressure nitrogen delivery pipe 11 is connected to the condensation outlet 121 of the heat exchanger 100, and the cond...

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Abstract

The invention discloses a method and a device for purifying ammonia synthesis virgin gas and co-generating SNG (synthetic natural gas) or/and LNG (liquefied natural gas) via liquid nitrogen washing, wherein by the addition of a methane rectification tower and a liquid methane pump in a conventional liquid nitrogen washing device, and a reasonable line configuration, a methane-rich fraction can be re-heated and then used as a city gas and output; the methane-rich fraction can also be cyclically refrigerated via Claude and used for producing the LNG product; simultaneously, a product adjustment can be performed on SNG and LNG according to different used loads.

Description

technical field [0001] The invention relates to the gas purification field of synthetic ammonia technology in the coal chemical technology of coke oven gas or LURGI furnace / BGL furnace to produce synthetic ammonia, in particular to a coal gasification method using LURGI furnace or BGL furnace as raw material, or coke oven The crude hydrogen gas (including hydrogen, carbon monoxide, nitrogen, methane, argon) as the raw material, the method and device for purifying and preparing ammonia to synthesize fresh gas, producing synthetic ammonia, and by-producing SNG, LNG and high-pressure gas products. The present invention is mainly aimed at the coal chemical technology of producing synthetic ammonia by adopting coke oven gas or LURGI furnace / BGL furnace. Background technique [0002] Due to the shortage of oil and natural gas reserves, a large number of coal chemical industries are developed in China. The choice of coal gasification is the key. However, the choice of coal gasifica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/50C01B3/00C10L3/10C10K1/00C10K1/08F25J3/08
CPCF25J3/0223F25J3/0233F25J3/0261F25J3/0276F25J2200/74F25J2200/80F25J2205/04F25J2205/30F25J2210/14F25J2210/42F25J2215/02F25J2215/04F25J2230/60F25J2245/42F25J2270/14F25J2270/42F25J2270/904Y02E60/32
Inventor 章华勇顾鹤燕杨震东
Owner SHANGHAI INT ENG CONSULTING
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