煤气化过程砷释放的在线监测及动力学特性  

On-Line Analysis and Kinetics of Arsenic Release During Coal Gasification

作　　者：沈锋华[1] 张保华 刘晶[1] 张振[1] 张志潮 Shen Fenghua;Zhang Baohua;Liu Jing;Zhang Zhen;Zhang Zhichao(State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,China;Guangdong Shaoneng Group Company Limited,Shaoguan 512026,China)

机构地区：[1]华中科技大学煤燃烧国家重点实验室,武汉430074 [2]广东韶能集团股份有限公司,韶关512026

出　　处：《燃烧科学与技术》2018年第2期165-169,共5页Journal of Combustion Science and Technology

基　　金：国家重点基础研究发展计划(973计划)资助项目(2014CB238904);国家自然科学基金资助项目(51606078);湖北省自然科学基金资助项目(2015CFA046)

摘　　要：采用烟气痕量元素在线监测方法研究了煤气化过程中砷的释放动力学特性.该方法基于ICP-OES技术,用于连续定量测量烟气中痕量元素的瞬时质量浓度.烟气中砷的质量浓度随反应温度的改变发生明显变化,表明温度对砷的迁移转化有显著影响.根据在线监测结果求取砷的释放速率,建立煤气化过程中砷释放的动力学方程,并包含温度的影响.采用热力学方法研究了煤气化过程中砷的形态和分布,砷可与飞灰中的CaO反应生成Ca(AsO_2)_2,使砷由气相迁移到固相中.The kinetic behavior of arsenic release during coal gasification was investigated by applying an on-line analysis system of trace elements in flue gas.This system is based on inductively coupled plasma optical emission spectroscopy(ICP-OES)and developed to measure temporal mass concentrations of trace element in flue gas quantitatively and continuously.Obvious variation of arsenic mass concentration in flue gas was observed during coal gasification,indicating strong influence of temperature on arsenic release.Based on the results of on-line analysis,the release rate of arsenic during coal gasification was obtained and the kenitic law including the influence of temperature was determined.Thermodynamic calculation was performed to identify the forms and distribution of arsenic in vapor and solid phases during coal gasification.The gaseous arsenic species can react with CaO to form solid Ca(AsO2)2.

关 键 词：砷 释放动力学 在线监测 煤气化 

分 类 号：TK16[动力工程及工程热物理—热能工程]