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该系统以农业废弃物玉米芯经富氧气化制备的低H_2/CO合成气为气源,采用固定床一步法合成二甲醚工艺,高效生产DME产品。运行结果表明,在空速为650h~(-1)和1200h~(-1)时,CO单程转化率分别为82.00%和73.55%,DME选择性分别为73.95%和69.73%,DME时空产率分别为124.28kg/(m~3·h)和203.80kg/(m~3·h)。生物质合成气的深度脱氧和脱焦油是保证合成系统稳定运行的关键。合成尾气H_2/CO较高,经脱CO_2后循环利用可大大提高DME的产率。
The system uses the low-H 2 / CO syngas produced from oxygen-enriched gasification of agricultural waste corn cob as the gas source, and uses the one-step fixed-bed synthesis of DME to produce DME products efficiently. The results showed that the single pass conversions of CO were 82.00% and 73.55% at space velocities of 650h ~ (-1) and 1200h ~ (-1), respectively. The DME selectivity was 73.95% and 69.73% Respectively 124.28kg / (m ~ 3 · h) and 203.80kg / (m ~ 3 · h). The deep deoxygenation and tar removal of biomass syngas is the key to ensure the stable operation of the synthesis system. The H 2 / CO of the synthesis tail gas is relatively high, which can greatly improve the yield of DME after the CO 2 is recycled.