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为考察热裂解温度及床料对生物质热裂解液固产物分布的影响,在一高温烟气发生炉加热的小型流化床上,以玉米秸秆粉为原料,石英砂、白云石和高铝矾土分别作为流化床床料,在450、475、500和525℃4个不同温度下进行热裂解液化试验。研究结果表明:①以上述3种物质分别作床料时,生物油收集率都先随温度的升高而增大,当温度升高到一定程度时,开始随温度的升高而下降。以白云石为床料的生物油收集率较高,在500℃时最高值可达43%,其次为石英砂,高铝矾土对应的生物油收集率较低;3种床料的生物油最大收集率均产生在约500℃。残炭收集率随温度升高一直呈下降趋势;以石英砂为床料时,残炭收集率较高,高铝矾土与之相近,白云石较低;②生物油分为轻质生物油和重质生物油两部分,随着温度的升高,重质生物油占所得生物油总重比例的变化和生物油收集率变化趋势几乎一致,并也在约500℃达到最大,之后两者都有下降,但重质生物油占总重比例的下降要较生物油收集率的下降剧烈。
In order to investigate the influence of the pyrolysis temperature and the bed material on the distribution of the solid products of the pyrolyzed biomass, a corn stover was used as the raw material in a small fluidized bed heated by a high-temperature flue gas furnace. The quartz sand, dolomite and high- Soil as fluidized bed material, respectively, at 450,475,500 and 525 ℃ 4 different temperatures pyrolysis liquefaction test. The results show that: (1) When the above three substances are used as bed materials respectively, the bio-oil collection rate will increase with the increase of temperature first. When the temperature rises to a certain extent, the collection rate of bio-oil begins to decrease with the increase of temperature. The collection rate of bio-oil using dolomite as bed material is higher, reaching the highest value of 43% at 500 ℃, followed by quartz sand, while the bio-oil collection rate corresponding to bauxite is lower. The bio-oil content of three bed materials The maximum collection rate was generated at about 500 ° C. The collection rate of residual carbon decreased with the increase of temperature. When quartz sand was used as bed material, the residual carbon capture rate was high, high bauxite was similar to dolomite, and dolomite was low. ② The bio-oil was classified as light bio-oil and With the increase of temperature, the change of heavy bio-oil in the total weight ratio of bio-oil obtained and the change tendency of bio-oil collection rate are almost the same, and also reach the maximum at about 500 ℃, after which both Declined, but the decline in the proportion of heavy bio-oil in the total weight ratio was drastic than that in the bio-oil collection rate.