Synthesis of DME via Reforming Biomass Fuel Gas with Biogas

doi:10.7523/j.issn.2095-6134.2005.4.005

Abstract

Abstract:

In the present work, the biogas produced by anaerobic digestion of biomass was used to reform biomass air steam gasification fuel gas over the ultra-stable NiOMgO catalyst for generation of synthesis gas CO). Different adjustment pathways for meeting the desired stoichiometry of the synthesis gas for the DME synthesis were compared and analyzed. The promoting effect of reforming reaction on the biomass syngas production was investigated. The activity and stability of reforming catalyst were also tested and valued. The desired stoichiometric syngas was obtained by coreforming with biogas and biomass fuel gas. The x (H₂)Px (CO) (syngas) is above 115. It contains trace CH and CO. The feeding rate of biogas depends on the composition and flow velocity of fuel gas produced in the gasifier. Above 70 %of the biomass carbon content was converted to DME. The selectivity of DME in the synthesis products was increased to 69.6 %. Compared with commercial nickelbased reforming catalysts, the MgO catalyst exhibits good catalytic activity, reducibility and anticoke ability at high temperature (> 750 ℃). The lifetime test for 100h indicates no coke formation on the surface of catalyst. It also exhibits no structure destroying after lifetime test. Compared with conventional stoichiometric factor adjustment pathways, the technology of co-reforming with addition of biogas was simple and highly effective. The composition of syngas by this technology is suitable for DME production.

Key words: biomass, reforming, dimethyl ether (DME)

CLC Number:

TQ223.24

WANG Tie-Jun, CHANG Jie. Synthesis of DME via Reforming Biomass Fuel Gas with Biogas[J]. , 2005, 22(4): 422-428.

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