生物质快速热裂解主要参数对产物产率及其分布的影响(英文)

Effects of biomass fast pyrolysis key parameters on yields and distributions of products

在生物质喂入率为 0 .8～ 2 .0 kg· h- 1的流化床上以木屑为原料进行了快速热裂解试验 ,系统研究了木屑热裂解过程中的流化床反应器温度、生物质粒径和气相滞留期三个主要参数对热裂解产物产率的影响。结果表明 ,当反应器温度在45 0～ 6 0 0℃之间变化时 ,在 5 0 0℃条件下 ,生物油产率最高 ,其值为 5 3.33%,而木炭及不可冷凝气体产率分别为 8.97%和37.70 %。当温度为 5 0 0℃ ,木屑粒径在 0 .90 mm以下时 ,粒径在 0 .45～ 0 .6 0 mm范围内的生物油产率最大 ,达到 5 8.2 3%,这时木炭产率为 8.2 3%。对粒径小于 0 .2 0 m m的木屑在温度 5 0 0℃ ,气相滞留期 0 .80 ,1.2 0 ,1.5 0 s三个量级上的热裂解表明 ,气相滞留期为 0 .80 s时 ,生物油产率达到最大值为 6 2 .6 0 %。但是 ,当气相滞留期较长时 (1.5 0 s) ,生物油产率稍有下降。生物油是极性有机物与水的可溶混合物。因此 ,木屑快速热裂解生产液体燃料具有较大的潜力。

Sawdust fast pyrolysis experiments were conducted in a fluidized bed reactor at a biomass feed rate of 0.80~2.00 kg·h -1. The effects of process conditions, like fluidized bed reactor temperature, feed size and vapor residence time on the product yields were studied. When reactor temperatures were varied from 450℃ to 600℃, a maximum bio-oil yield of 53.33%wt was achieved at 500℃ with a char and gaseous yields of 8.97 %wt and 37.70%wt respectively. The particle size of sawdust varied in the range of 0~0.90 mm. The yield of bio-oil was maximum (58.23%wt of biomass feed) for the particle size of 0.45～0.60 mm with a char yield of 8.23%wt. Vapor residence times were ranged from 0.80 to 1.50 s at temperature of 500℃ with a particle size less than 0.20 mm. A maximum bio-oil yield of 62.60%wt was achieved at 500℃ when the vapor residence time was held constant at 0.80 s. However, at the longer residence time(1.50 s), bio-oil yield was slightly lower. Bio-oil is a miscible mixture of polar organics with water. The results showed the potential of sawdust fast pyrolysis for liquid hydrocarbon fuels production.