Preparation method of fly ash-based adsorption material for biogas purification

Abstract

The invention belongs to the field of solid waste disposal and biogas purification, and particularly relates to a preparation method of a fly ash-based adsorption material for biogas purification. The method comprises the following steps: by taking incineration fly ash as a raw material, crushing and sieving by adopting a ball mill, putting the fly ash into a vertical tube furnace, introducing a nitrogen-rich aqueous solution at 600-900 DEG C, activating for 1-3 hours, cooling, loading alkali / alkaline earth metal chlorate by adopting an excessive impregnation method, and carrying out rotary evaporation drying, thereby obtaining the fly ash-based adsorption material. The prepared adsorption material not only has a good synergistic removal effect on impurity gases such as CO2 and H2S in the biogas, but also has the characteristics of low raw material price, simple preparation process and the like, and resource utilization of the fly ash and efficient purification of the biogas are realized.

Description

technical field [0001] The invention belongs to the fields of solid waste disposal and biogas purification and purification, and in particular relates to a preparation method of a fly ash-based adsorption material used for biogas purification. Background technique [0002] Biogas is a combustible gas produced by microbial fermentation of organic matter under anaerobic conditions, and its main components include CH 4 (50%~80%) and CO 2 (20% ~ 40%), also contains a small amount of H 2 S (0.5% ~ 3%), O 2 , CO, N 2 Wait. CO 2 The existence of will greatly reduce the calorific value and energy density of biogas, and increase the ignition temperature; while H 2 S is a highly toxic gas, which not only corrodes pipes, metal instruments, etc. during transportation and storage, but also produces SO after combustion. 2 Will cause environmental pollution. Therefore, the removal of CO from biogas 2 and H 2 S and other impurity gases are the key steps to realize the safe and eff...

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Problems solved by technology

Due to the poor selectivity of the absorbent (water), high power consumption, and huge equipment, the high-pressure water washing method has been less used in recent years; the physical absorption method is mainly low-temperature methanol method and propylene carbonate method, and the absorption effect is better, but High investment cost and large loss of absorbent; chemical absorption method mainly uses ethanolamine, diethanolamine, N-methyldiethanolamine and other alcoholamine solvents as absorbents, which are prone to solvent foaming and degradation, and are highly corrosive and selective Insufficiency such as low performance; membrane separation to remove CO 2 and H 2 S technology has the advantages of environmental friendliness and safe operation, but due to factors such as complex membrane production process, high cost, and stability to be improved, industrial application has not yet been realized.