Biogas cleaning equipment and purifying technique thereof

Abstract

The invention relates to the biogenetic gas purification field, in particular to a biogenetic gas purifying equipment and a purifying technique. The equipment comprises an absorption tower, a desorption tower, a reboiler, a heat exchanger, a cooler, a separator, an absorbent holding tank and a pump. The invention is characterized in that: firstly, the absorption tower is a different diameter tower featuring with small upper section and large lower section and the upper-and-lower tower diameter ratio ranges between 0.75 and 0.85; secondly, a catcher with metal mesh is added inside the former material gas inlet of the adsorbption tower; thirdly, a fiber rod filter is arranged at the outlet of the rich solution outlet of the absoption tower. The technique adopts the water solution as the absorption solution with MEDA main solute and multi-amine activator, and the operation parameters are 30 kPa to 40 kPa operation pressure inside the tower ranges, 45 DEG C. to 55 DEG C. temperature at the tower top of the tower and 50 DEG C. to 60 DEG C. at the bottom, 25 to 35 (m3G / m3L) gas-liquid ratio, 2.56 to 4.28Kmol per m3 absorption solution concentration, and 1 to 2.5LCO2 per L lean solution concentration. The invention is used to remove the impurities of CO2, H2S, HCN and the organic sulfur from the biogenetic gas, coal bed gas and coke-oven gas to meet the purification requirement.

Description

technical field [0001] The invention relates to the field of biogas purification, in particular to biogas purification equipment and a purification process thereof. It can be used for biogas and other industrial gases, such as coal bed methane, coke oven gas, etc. to remove CO 2 、H 2 S, HCN, organic sulfur and other impurities meet the requirements of purification. Background technique [0002] Biogas refers to the combustible gas produced by microbial degradation and methanation of organic matter in living organisms under anaerobic conditions. Artificially produced biogas mainly includes landfill gas (LFG) produced after domestic waste is landfilled, biogas produced by fermentation of plants such as garbage, sewage, sludge, manure, straw, etc. Its main component is CH 4 , CO 2 , a small amount of H 2 、C m h n and a small amount of H 2 S, organic sulfur and other impurities. At present, the purification and utilization of domestic biogas, especially landfill gas (L...

AI Technical Summary

Problems solved by technology

But it has its shortcomings: firstly, it is limited to the separation process, when CH 4 When the concentration is constant, the actual methane yield in its production is only 70%

Domestic PSA method is widely used in chemical industry, equipment and adsorbents do not need to be imported, energy consumption is relatively low, but it also has its disadvantages: limited by process characteristics, when the product concentration is increased, its methane yield will decrease accordingly

In addition, limited by the current domestic landfill conditions, especially the low output of LFG, it is difficult to adopt a large-scale high-pressure absorption and purification process

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