中文摘要：

在生物质流化床气化中试装置上考察了不同原料、当量比和水蒸气配比工况下的温度分布、燃气特性和稳定性等气化特性。结果表明：木屑、稻壳和2种颗粒燃料的气化气体体积分数范围为：H227.1%～30.4%、CO 29.7%～32.6%、CO225.3%～27.9%和CH44.9%～5.8%;使用木屑和稻壳为原料可比颗粒燃料获得较均匀的气化温度分布,增加当量比和水蒸气配比可使流化床温度分布更均匀;在气化炉密相区,随气化炉高度增加,H2和CO体积分数升高,CO2和O2体积分数降低;在稀相区气体组分含量随高度变化平缓;改变气化介质、当量比、水蒸气配比和二次风配比可显著影响气化气体焦油含量;木屑水分的提高会降低气化稳定性,稻壳气化过程中易出现炉底温度骤升现象,颗粒燃料气化过程中易导致密相区温差和压差持续升高。

英文摘要：

The effects of equivalence ratio（RER） and steam/biomass（S/B） ratio on gasification performances such as temperature distribution,gas composition and gasification stability were investigated in a pilot-scale fluidized bed gasifier with different feedstocks（sawdust,rice husk,wood pellet and straw pellet）.The results showed that typical product gas percentage components from gasification were as follows：H227.1% ～ 30.4%,CO 29.7% ～ 32.6%,CO225.3% ～ 27.9%,CH44.9% ～ 5.8%.The uniformity of temperature distribution increased with RERand S /B ratio.More uniform temperature distribution was obtained in the case of sawdust and rice husk gasification.In the downstream direction of the dense phase zone,H2 and CO increased significantly whereas CO2 and O2decreased considerably.In the dilute phase zone,the components of product gas varted slightly.Increasing the moisture content of sawdust will deteriorate the gasification stability.An abrupt increase of temperature in the bottom of gasifier was observed during the rice husk gasification.A consistent increase of temperature drop and pressure drop was observed in the dense phase zone in the case of wood pellet and straw pellet gasification.