微型流化床中原位焦和冷却焦燃烧动力学研究  

Combustion Kinetics of In-situ Char and Cold Char in Micro-Fluidized Bed

作　　者：方园[1] 罗光前[1] 陈超[1] 李进[1] 赵洪[1] 段然[1] 陈鎏竹 李凯迪 姚洪[1] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,武汉430074

出　　处：《燃烧科学与技术》2016年第2期148-154,共7页Journal of Combustion Science and Technology

基　　金：科技部重大仪器专项资助项目(2011YQ120039)

摘　　要：采用自主开发的微型双床燃料分级原位气固反应分析仪研究了原位焦燃烧特性及动力学,并与实验中常用的热解完成后急速冷却的焦（冷却焦）进行对比.采用的两种不同冷却速率的焦分别为快冷焦（10^4～10^5,K/s）和慢冷焦（10^2～10^3K/s）.结果表明：对无烟煤和烟煤,原位焦平均燃烧速率是快冷焦的1.1～1.2 倍,是慢冷焦的1.5～1.6倍,这是由于冷却过程降低了焦反应性,且再加热过程中冷却焦的颗粒温度远低于原位焦.XRD 分析结果证明冷却速率越慢,焦越向有序化的结构发展.The combustion kinetics of in-situ char and rapid cooling char in the independently developed micro twostepbed reactor was studied in order to clarify the influence of cooling and reheating process on char reactivity.Coldchars collected at two different cooling rates were investigated in this experiment.The rapid cooling char was cooledat 104-105,K/s and the slow cooling char was cooled at 102-103,K/s.Results suggested that for both anthracite andbitumite,the average combustion rate of in-situ char was 1.1-1.2 times that of rapid cooling char and 1.5-1.6 timesthat of slow cooling char.This was because the cooling process reduced char reactivity and during the reheating processthe particle temperature of cold char was far lower than that of in-situ char.As was shown in the X-ray diffract（XRD） spectra,the char structure was becoming more ordered with cooling rate decreasing.

关 键 词：原位焦 冷却焦 动力学 燃烧 双床 

分 类 号：TQ534[化学工程—煤化学工程]