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Biogas decarburization and tertiary desorption process

A biogas and decarbonization technology, applied in gas fuel, petroleum industry, dispersed particle separation, etc., can solve the problems of poor economy, high investment cost, high energy consumption, and achieve high absorption capacity, high recovery rate, and strong analytical ability. Effect

Inactive Publication Date: 2013-01-09
开封黄河空分集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, biogas decarbonization is mainly solvent absorption method, which has better separation effect, but has high investment cost, high energy consumption and poor economy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Biogas decarbonization washing liquid three-stage analysis process, the desulfurized biogas is pressurized to 2MPa by the biogas compressor and enters the absorption tower, 30% of the purified biogas at the top of the tower is sent to the third-stage analysis tower, and the washing liquid from the absorption tower is depressurized to 1.0MPa and enters the first stage. The first-stage desorption tower is used to decompose and recover part of the methane; the washing liquid after the first-stage desorption is depressurized to atmospheric pressure and then enters the second-stage desorption tower to desorb and release the carbon dioxide; the washing liquid after the two-stage desorption is subjected to static pressure through the liquid column to the third-stage desorption column. The top of the analysis tower is in countercurrent contact with the purified biogas from the absorption tower, and the washing liquid can be deeply resolved. The operating pressure of the three-st...

Embodiment 2

[0028] The three-stage analysis process of biogas decarbonization washing liquid, the desulfurized biogas is pressurized to 1MPa by the biogas compressor and enters the absorption tower, 20% of the purified biogas at the top of the tower is sent to the third-stage analysis tower, and the washing liquid from the absorption tower is decompressed to 0.5MPa and enters the first stage. The first-stage desorption tower is used to decompose and recover part of the methane; the washing liquid after the first-stage desorption is depressurized to atmospheric pressure and then enters the second-stage desorption tower to desorb and release the carbon dioxide; the washing liquid after the two-stage desorption is subjected to static pressure through the liquid column to the third-stage desorption column. The top of the analysis tower is in countercurrent contact with the purified biogas from the absorption tower, and the washing liquid can be deeply resolved. The operating pressure of the th...

Embodiment 3

[0030] Biogas decarbonization washing liquid three-stage analysis process, the desulfurized biogas is pressurized to 0.6MPa by the biogas compressor and enters the absorption tower, 10% of the purified biogas at the top of the tower is sent to the third-stage analysis tower, and the washing liquid from the absorption tower is depressurized to 0.3MPa and enters The first-stage desorption tower decomposes and recovers part of the methane; the washing liquid after the first-stage desorption is decompressed to atmospheric pressure and then enters the second-stage desorption tower to desorb and release the carbon dioxide; The top of the desorption tower is in countercurrent contact with the purified biogas from the absorption tower, and the washing liquid can be deeply decomposed. The operating pressure of the three-stage analytical tower is 10KPa. The analytical gas is returned to the inlet of the biogas compressor for recycling, and the washing liquid is pressurized by the water ...

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PUM

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Abstract

The invention discloses a biogas decarburization and tertiary desorption process. The biogas decarburization and tertiary desorption process includes that desulfurized biogas is compressed by a compressor and then is fed into an absorption tower to be subjected to spray washing, the washed and purified biogas is divided into two portions, one portion of biogas is subjected to a follow-up dehydration procedure, and the other portion of biogas is fed to a tertiary desorption tower; washing liquid of the absorption tower is decompressed and then is fed into a primary desorption tower, the primarily desorbed washing liquid is decompressed again and then is fed into a secondary desorption tower; the secondarily desorbed washing liquid is fed into the tertiary desorption tower from the top of the tertiary desorption, the purified biogas from the top of the absorption tower is fed into the tertiary desorption tower from the bottom of the tertiary desorption tower, and residual carbon dioxide in the washing liquid from the secondary desorption is desorbed deeply; and the washing liquid after the tertiary desorption is fed back to the top of the absorption tower to perform spray washing for desulfurized biogas, and circulation is realized. The process is simple in flow, safe in operation, high in carbon dioxide absorption capacity, product gas recovery rate and desorption capacity and free of environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of biogas purification, and in particular relates to a biogas decarbonization three-stage analysis process. Background technique [0002] Facing the global energy and climate crisis, my country has made major adjustments to its energy structure during the "Twelfth Five-Year Plan" period. The preferred way to reduce emission intensity is to change the energy structure dominated by coal and oil, reduce carbon emission intensity from the supply side, and increase the introduction of clean renewable energy. Biogas application is in line with this feature. Therefore, the state will make overall planning for biogas construction during the “Twelfth Five-Year Plan” period, and incorporate biogas-focused energy construction into the national “Twelfth Five-Year Plan” energy development strategy. Give preference when arranging project funding. [0003] At present, biogas decarbonization is mainly solvent absorption m...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/62C10L3/10
Inventor 康相江郭小卫王好民宋真真方鸽
Owner 开封黄河空分集团有限公司
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