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Method and device for recycling liquid nitrogen washing exhaust gas

A liquid nitrogen washing and recycling technology, which is applied in chemical instruments and methods, carbon monoxide, separation methods, etc., can solve the problems of inability to realize the resource utilization of liquid nitrogen washing tail gas, and achieve the effect of flexible use

Inactive Publication Date: 2019-07-23
YUNNAN TIANAN CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the CO in the liquid nitrogen scrubbing tail gas is directly recovered, and the resource utilization of the liquid nitrogen scrubbing tail gas cannot be realized

Method used

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  • Method and device for recycling liquid nitrogen washing exhaust gas
  • Method and device for recycling liquid nitrogen washing exhaust gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Example 1 Liquid nitrogen tail washing to produce hydrogen for hydrogenation

[0061] figure 1 It is the device diagram for resource utilization of liquid nitrogen washing tail gas in Example 1. The number of CO adsorbers is 2. In the figure, 1 is a turbine blower, 2 is a water cooler, 3-1 is the first CO adsorber, 3- 2 is the second CO adsorber, 4 is the vacuum pump, 5 is the gas cabinet, 6 is the compressor, 7 is the high temperature shift furnace, 8 is the medium and low temperature shift furnace, 9 is the water cooler, and 10 is the decarbonization adsorber.

[0062] Liquid nitrogen scrubbing tail gas treatment capacity: 28000~30000m 3 / h, liquid nitrogen wash tail gas components (volume fraction): CO 10%, H 2 1.7%, CH 4 0.3%, N 2 88%. The liquid nitrogen wash tail gas enters the turbine blower (1) from the main pipe at 0.1MPa (gauge pressure) to increase the pressure to 0.3MPa, and then enters the water cooler (2) outside the tube. At the bottom of the CO a...

Embodiment 2

[0065] Example 2 The tail gas was washed with liquid nitrogen to produce synthetic ammonia synthesis gas, and the device was the same as that of Example 1.

[0066] Liquid nitrogen scrubbing tail gas treatment capacity: 28000~30000m 3 / h, liquid nitrogen wash tail gas component (volume fraction): CO 6%, H 2 1.2%, CH 4 0.8%, N 2 88%. The liquid nitrogen wash tail gas enters the turbine blower (1) from the main pipe at 0.1MPa (gauge pressure) to increase the pressure to 0.3MPa, and then enters the water cooler (2) outside the tube. At the bottom of the CO adsorber (3-1), carbon monoxide is adsorbed and retained, and the unadsorbed nitrogen and other components are discharged from the top of the first CO adsorber (3); two carbon monoxide adsorbers are used interchangeably, and the saturated first CO The adsorber (3-1) is regenerated. At this time, the adsorption of carbon monoxide is carried out in the second CO adsorber (3-2), and it is extracted from the bottom of the sec...

Embodiment 3

[0067] Example 3 Wash tail gas with liquid nitrogen to produce methanol synthesis gas, the device is the same as that in Example 1.

[0068] Liquid nitrogen scrubbing tail gas treatment capacity: 20000~25000m 3 / h, liquid nitrogen wash tail gas component (volume fraction): CO 6%, H 2 2.1%, CH 4 0.9%, N 2 88%. The liquid nitrogen wash tail gas enters the turbine blower (1) from the main pipe at 0.1MPa (gauge pressure) to increase the pressure to 0.35MPa, and enters the water cooler (2) outside the pipe. At the bottom of the CO adsorber (3-1), carbon monoxide is adsorbed and retained, and the unadsorbed nitrogen and other components are discharged from the top of the first CO adsorber (3); two carbon monoxide adsorbers are used interchangeably, and the saturated first CO The adsorber (3-1) is regenerated. At this time, the adsorption of carbon monoxide is carried out in the second CO adsorber (3-2), and it is extracted from the bottom of the second CO adsorber (3-2) with a...

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Abstract

The invention provides a method and a device for recycling a liquid nitrogen washing exhaust gas and belongs to the field of energy utilization and environmental protection. The method comprises the following steps: boosting and water-cooling the liquid nitrogen washing exhaust gas in turn, thereby acquiring a pretreated liquid nitrogen washing exhaust gas; performing carbon monoxide absorption onthe pretreated liquid nitrogen washing exhaust gas, thereby acquiring a carbon monoxide gas; compressing the carbon monoxide gas and then mixing with a first water vapor and performing high-temperature conversion, thereby acquiring a high-temperature conversion gas, wherein a high-temperature conversion catalyst B118 is applied to the high-temperature conversion; mixing the high-temperature conversion gas with a second water vapor and performing medium-low temperature conversion, thereby acquiring a medium-low temperature conversion gas, wherein a medium temperature catalyst B116 and a low-temperature catalyst B205 are applied to the medium-low temperature conversion; cooling and decarburizing the medium-low temperature conversion gas in turn, thereby acquiring a synthesis gas. Accordingto the method provided by the invention, the recycling of the liquid nitrogen washing exhaust gas can be realized and the acquired different synthesis gases can be used for industrial production.

Description

technical field [0001] The invention relates to the technical fields of energy utilization and environmental protection, in particular to a method and device for resource utilization of liquid nitrogen scrubbing tail gas. Background technique [0002] Modern coal chemical production uses coal as raw material, mostly uses pure oxygen for oxidation, uses air separation to increase oxygen, and at the same time can provide liquid nitrogen to wash trace CO in syngas. At low temperature, using liquid nitrogen as an absorbent, the components CO, Ar, and CH in the raw gas that are close to the boiling point of nitrogen are synthesized 4 Absorbed by liquid nitrogen, and then discharged in gaseous state after being recovered by cold energy, it is called liquid nitrogen scrubbing tail gas. Liquid nitrogen scrubbing tail gas contains CO, H 2 、CH 4 , Ar and N 2 , The gas composition is clean and does not contain components that are prone to catalyst poisoning. [0003] Liquid nitrog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10K1/16C10K1/00C10K1/04B01D53/18B01D53/14C01B32/40C01B3/16
CPCC10K1/16C10K1/003C10K1/04B01D53/18B01D53/1456C01B32/40C01B3/16B01D2257/502C01B2203/0283C01B2203/042C01B2203/1258Y02P20/52Y02P20/151
Inventor 刘强宁平蒋忠成殷梁淘王小勇张秋林牟刚林殷在飞
Owner YUNNAN TIANAN CHEM CO LTD
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