生物质气化气中焦油催化裂解模型  

A kinetics model of the catalytic tar cracking in biomass gasification

作　　者：韦杰[1] 董长青[1] 杨勇平[1] 

机构地区：[1]华北电力大学电站设备状态监测与控制教育部重点实验室,北京102206

出　　处：《可再生能源》2007年第5期35-39,共5页Renewable Energy Resources

基　　金：自然科学基金(50476069;50576023);华北电力大学校内基金(200525003)。

摘　　要：生物质流化床气化气中焦油的催化裂解模型一般采用简单的一阶集总动力学反应,在一些应用方面不够完善。文章在Shamsi和Aznar的模型之上引出了微观反应动力学模型。该模型建立在二集总或焦油的不同种类基础之上,它有4个动力学常数。每一个集总反应都包括热裂解和催化裂解反应。选择Corella的试验为对象,催化温度为840℃左右,将硅藻土和镍基水蒸气重整型催化剂(ICI46-1)在小型试验台上所得到的数据应用于此微观模型,得到的4个动力学常数是相互关联的,并且符合试验结果,在焦油催化裂解研究方面取得了一大进步。A single one-lump first-order reaction for the catalytic tar-cracking present in the flue gas from biomass-fluidized bed gasifiers is not good enough for some applications. A new and more advanced reacting network and microkinetic model has been generated and is here presented. It is based on two lumps which are the more and the less reactive tar species, and has four kinetic constants. Each lump reacts by both catalytic and thermal reactions. The microkinetic model is applied to results obtained at around 840 ℃ and at small pilot plant level with two very different solids ：silica sand and a eommercial（ICI 46-1 ） nickel-based steam-reforming catalyst from Corella＇s experiments. The values found for the four kinetic constants are self-consistent, fit well the resuits, and the model can be seen as a obvious progress forward in the modeling of the catalytic tar abatement.

关 键 词：生物质 焦油 催化裂解 动力学模型 

分 类 号：TK6[动力工程及工程热物理—生物能] TQ524[化学工程—煤化学工程]