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Method for pressurizing, washing and purifying biogas and vacuum desorption discharge system

A pressurized water washing and discharge system technology, applied in the field of gas-liquid mass transfer, can solve the problems of incomplete desorption, achieve complete desorption, reduce energy consumption, and reduce refrigeration energy consumption.

Active Publication Date: 2017-08-08
山东启阳清能生物能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual experiments, it was found that due to the limitation of the gas-liquid equilibrium, even if the desorption process is enhanced by ultrasonic waves, the desorbed water still contains a small amount of CO 2 , that is, the desorption is still not complete

Method used

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  • Method for pressurizing, washing and purifying biogas and vacuum desorption discharge system
  • Method for pressurizing, washing and purifying biogas and vacuum desorption discharge system
  • Method for pressurizing, washing and purifying biogas and vacuum desorption discharge system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Such as figure 1 As shown, a vacuum desorption discharge system for pressurized water washing to purify biogas includes a biogas compressor 101, a heat exchanger 102, a dryer 105, a water chiller 106, a booster pump 107, a flash tower 109, and a Pressure tower 112, desorption tower 115, water storage tank 121, desorption tower vacuum pump 117, desorption tower vacuum discharge pump 120. The heat exchanger 102 communicated with the outlet of the biogas compressor 101 , the absorption tower 103 communicated with the outlet of the heat exchanger 102 , and the top of the absorption tower 103 communicates with the drier 105 through a valve 104 . The outlet of water storage tank 121 is communicated with chiller 106, and chiller 106 is communicated with absorption tower 103 through booster pump 107, and the bottom of absorption tower 103 communicates with flash tower 109 top through pipeline and valve 108, and the top of flash tower 109 is provided with The valve 110 is commu...

Embodiment 2

[0072] The similarities between this embodiment and Embodiment 1 will not be repeated, and the difference is:

[0073] The outside temperature is 15-18°C; the water discharged from the bottom of the desorption tower 115 enters the water storage tank 121 through the valve 119 and the vacuum discharge pump 120 of the desorption tower, and then returns after being pressurized by the booster pump 107 without being cooled by the chiller 106 In the absorption tower 103, the water temperature is maintained at 9.5-10.5°C.

[0074]According to the People's Republic of China Geological and Mineral Industry Standard DZT 0064.47-1993 "Groundwater Quality Inspection Method Titrimetric Determination of Free Carbon Dioxide" to measure CO in the water discharged from the bottom of the desorption tower 115 2 The content is 11.20 mg / L; the composition of the product gas measured by Wuhan Sifang Gasboard-3200 biogas analyzer is as follows: the methane content is 96.35% (volume percentage), the c...

Embodiment 3

[0076] Embodiment 3 (comparative example):

[0077] Such as figure 2 As shown, the process flow of pressurized absorption, purification and purification of biogas in the prior art includes a biogas compressor 101, a heat exchanger 102, an absorption tower 103, a dryer 105, a chiller 106, a booster pump 107, and a flash tower 109, Step-down tower 112, desorption tower 115, water storage tank 121, feed pump 201; blower 202.

[0078] The biogas compressor 101, heat exchanger 102, absorption tower 103, drier 105, water chiller 106, booster pump 107, flash tower 109, step-down tower 112, desorption tower 115, water storage tank 121 and implementation adopted in this implementation Example 1 is the same.

[0079] The methane content in the biogas is 53% (volume percentage), and the carbon dioxide content is 47% (volume percentage).

[0080] The outside temperature is 28-30°C.

[0081] Biogas purification and purification process is the same as embodiment 1 and will not be repea...

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Abstract

The invention discloses a method for pressurizing, washing and purifying biogas and a vacuum desorption discharge system. The system comprises a biogas compressor, a heat exchanger, a dryer, a booster pump, a flash tower, a decompression tower, a desorption tower, a water storage tank, a desorption tower vacuum pump and a desorption tower vacuum discharge pump. The method comprises the following steps: pressurizing biogas through the biogas compressor, cooling the biogas through the heat exchanger and feeding the biogas into an absorption tower; cooling water through a water chilling unit, pressurizing through the booster pump, enabling the water to enter from the upper part of the absorption tower, enabling the biogas to be reversely in contact with the water from bottom to top in the absorption tower, and discharging CH4-enriched gas from the top of the absorption tower; enabling the water discharged from the bottom of the absorption tower to enter the flash tower, returning the released CH4 and CO2 mixed gas to a gas storage tank to be mixed with raw gas so as to participate in washing and separating again; enabling the water discharged from the bottom of the flash tower to enter the decompression tower, and discharging the desorbed carbon dioxide from the top of the decompression tower; enabling the water discharged from the bottom of the decompression tower to enter the desorption tower, discharging the desorbed gas from the top of the desorption tower, and enabling the water discharged from the bottom of the desorption tower to enter the water storage tank by virtue of the desorption tower vacuum discharge pump.

Description

technical field [0001] The proposal relates to the technical field of gas-liquid mass transfer, in particular to a method for pressurized water washing to purify biogas and a vacuum desorption discharge system. Background technique [0002] Biogas is an important clean and renewable energy, which can not only replace coal-fired power generation and heat supply, but also can be used as a substitute for natural gas after purification. Biogas purification and purification mainly involves desulfurization, decarbonization, dehydration, dust removal and other processes, among which biogas decarbonization is a key step in biogas purification and purification. The decarbonization methods mainly include pressure swing adsorption, membrane separation, physical absorption, chemical absorption, cryogenic separation and in-situ purification, among which the physical absorption method uses CO 2 The difference between the solubility of hydrocarbons and hydrocarbons in physical solvents co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14B01D53/18C10L3/10
CPCB01D53/1425B01D53/1475B01D53/18C10L3/104
Inventor 金付强张晓东许海朋华栋梁李岩赵玉晓牧辉司洪宇梁晓辉
Owner 山东启阳清能生物能源有限公司
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