With the continuous improvement of the application of biogas, the requirement of biogas desulfurization is becoming more and more fine. In addition to dry desulfurization, wet desulfurization and biological desulfurization, two classical methods of biogas desulfurization are introduced.
1. Desulfurization by PSA and membrane separation
The principle of pressure swing adsorption (PSA) is to separate gases by adsorbing different gases at different pressures and different adsorption rates and quantities. Membrane separation is the separation of gases by selective permeation of gases with different molecular sizes and different gas penetration rates. The hydrogen sulfide separated by these two methods needs to be reprocessed, and at the same time, the methane gas will be greatly damaged.
In addition, the membranes used in membrane separation process need to be replaced frequently, and the operation cost is high. Pressure swing adsorbent and chemical absorbent can be recycled. Therefore, pressure swing adsorbent has a wider application than membrane separation technology.
2. Alkali elution desulfurization
Alkali elution desulfurization refers to the use of alkali liquor for desulfurization. According to different regeneration methods, it can be divided into chemical method and biological method. The two methods are identical in desulfurization, sulfur treatment and alkali blending. The process of catalyst regeneration is called chemical regeneration desulfurization, and the process of bacterial regeneration is called biological regeneration desulfurization.
In addition to the different regeneration methods, the main application fields of these two methods are also different. Among them, the biological regeneration alkali elution desulfurization process has certain application in the pretreatment process of biogas power generation gas, but has not been applied in the actual project of removing hydrogen sulfide from natural gas refined by biogas. The chemical regeneration method corresponds to the chemical regeneration method. It is more widely used.
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