稻壳在循环流化床内的燃烧试验研究  

Experimental study on rice hull combustion in circulating fluidized bed

作　　者：伊晓路[1] 张卫杰[1] 郭东彦[1] 徐健[1] 许敏[1] 孙立[1] 

机构地区：[1]山东省科学院能源研究所,济南250014

出　　处：《农业工程学报》2007年第4期212-216,共5页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家863资助项目(2003AA514030)

摘　　要：为了了解风量对稻壳在循环流化床内燃烧温度的影响,在循环流化床试验装置上测量了炉膛内燃烧温度并分析其变化规律以确定稻壳燃烧参数。当风料比为4.2 m3/kg时,二次风与一次风量比1-1.2时燃烧工况较好,炉膛内温度控制在800-850℃;在燃烧过程中有焦炭回料时,炉膛内温度分布均匀,波动范围较小;否则炉膛内温度分布不均匀。稻壳灰熔点为1230℃,但温度1000℃时就出现结焦;在温度700-800℃时出现结团,采取炉膛内温度升高后和流化风速较大时加入石英砂以及点火之初选择1 m/s左右的流化风速,将可以大大减少结团现象。Rice hull was chosen as feedstock to conduct experiments, and the thermogravimetric analyzer was used to analyze its pyrolysis characteristics. The combustion process research was carried out in circulating fluid bed （CFB） in order to find important combustion parameters. When the ratio of secondary air output and first air output lies in the range of 1.0-1.2, and the ratio of air to material is 4.2 m^3/kg, the temperature in firebox can be controlled in the range of 800-850℃. Temperature was relatively uniform with little fluctuant range only when normal coke circulating appeared. The ash melting point of rice hull is 1230℃, but it are easy to sinter at 1000℃ and agglomerate within 700-800℃. Two methods can be helpful to avoid the agglomeration in straw combustion process in CFB. The first is to input quartzite sand when the temperature in firebox was high with high circulating wind rate. The second is to choose 1 m/s as fluidized rate when ignition starts.

关 键 词：稻壳 循环流化床 热解曲线 结焦 结团 

分 类 号：TK6[动力工程及工程热物理—生物能]