Abstract: In order to study the influence of gasification temperature, gasification agents and blending ratios on gas component, low heat value (LHV), gasification efficiency and carbon conversion rate during co-gasification in a circulating fluidized bed, experimental tests were carried out with air vapor of room temperature heated to 500 ℃. Results show that the rise in gasification temperature can promote the carbon conversion rate and the gasification efficiency. The highest gasification efficiency of anthracite gasification alone is at 950 ℃ between the range of 800～1000 ℃, and the highest gasification efficiency of corn stalks sample of 20% blending ratio is at 850 ℃. With air vapor being the gasification agents, H2 increased from 1.80% to 15.53%. The addition of corn stalk promoted the generation of CO while inhibited the generation of CO2. But LHV, carbon conversion rate and gasification efficiency decreased when blending ratio exceeds 40%. With air being the gasification agent, the highest LHV appeared at 20% blending ratio, and with air vapor as the gasification agent, the highest LHV appeared when the blending ratio was 40%.

Key words: co-gasification, fluidized bed, corn stalks, anthracite, air vapor

摘要： 以玉米秸秆与无烟煤为原料，在循环流化床中进行空气-水蒸汽气化试验，采用预热装置将气化剂（空气、水蒸汽）由常温加热至500 ℃，研究了不同气化温度、气化剂类型及生物质掺混比例对气化燃气组分和热值、气化效率及碳转化率等评价指标的影响。结果表明：提高气化温度能增大碳转化率及气化效率，在800～1000℃范围内，无烟煤单独气化950 ℃时气化效率最高，掺混比（m玉米秸秆：m煤）20%的混合试样850 ℃时气化效率最高；选择空气-水蒸汽气化剂时，H2体积分数由1.80%增加到15.53%；随着玉米秸秆掺混比增加，促进了CO的生成，抑制了CO2的生成，但掺混比例大于40%时会降低燃气热值及碳转化率。使用空气作气化剂，掺混比20%时燃气热值最高，选择空气-水蒸汽作气化剂时，掺混比40%时燃气热值最高。

关键词: 共气化, 流化床, 玉米秸秆, 无烟煤, 空气-水蒸汽