Sustainable Mining and Metallurgy

Biomass pyrolysis and gasification is the key technology of biomass energy utilization. It has great significance to study the pyrolysis and gasification characteristics of straw biomass for the efficient utilization of a large number of biomass straw resources in rural areas of China. In this paper, the typical wheat straw and rice straw in rural areas of China were taken as the research objects. Based on the tube furnace system, a biomass pyrolysis and gasification experimental platform was built to study the pyrolysis and gasification of wheat straw and rice straw in N₂ atmosphere. The law of gas production was analyzed, and the influence mechanism of different pyrolysis temperatures on its pyrolysis gas production was analyzed. The results show that with the increase of pyrolysis temperature, four kinds of gases such as CO, CO, CH₄ and H₂ are produced in the pyrolysis process of straw. The content of CO in syngas is more and more with the increase of temperature, and the second CO yield peak appears in the pyrolysis of wheat straw at high temperature stage. CO mainly comes from cellulose pyrolysis, followed by hemicellulose pyrolysis. The content of CO₂ and CH4 increases first and then decreases with the increase of the temperature, while the content of H₂ continued to increase. This is because CH4 is easily decomposed into H₂ at high temperature, and the broken bond recombination of —CC— and —CH— and the secondary cracking reaction of volatiles further increase the content of H₂.