朝鲜无烟煤燃烧特性随升温速率的变化及动力学研究  

Study on Combustion Characteristics and Kinetics of DPR Korea’s Anthracite with Heating Rate

作　　者：吴英主 张永生[1] O Yongju;ZHANG Yongsheng(Key Laboratory of Power Station Energy Transfer Conversion and System,Ministry of Education,North China Electric Power University,102206 Beijing,China)

机构地区：[1]华北电力大学电站能量传递转化与系统教育部重点实验室,北京102206

出　　处：《煤炭转化》2022年第6期20-28,共9页Coal Conversion

摘　　要：燃烧特性和燃烧反应动力学参数是燃料用于燃烧装置热力计算、设计和数值模拟必不可少的主要数据。利用同步热重分析仪在空气气氛下以升温速率分别为10℃/min,20℃/min,30℃/min升温至1200℃进行了朝鲜无烟煤(KA)燃烧实验,同时与中国无烟煤(CA)进行对比,并计算得到了KA和CA的燃烧特性指数,采用等转化率的Flynn-Wall-Ozawa(FWO)和Kissinger-Akahira-Sunose(KAS)方法估算了反应动力学参数。结果表明:升温速率对KA和CA的着火性能有重要影响,升温速率越快,KA和CA的着火性能指数提高越明显;KA的燃烧特性指数均低于CA的燃烧特性指数,KA的燃烧特性比CA的燃烧特性差,更难燃烧;KA的平均表观活化能为112.13 kJ/mol,明显高于CA的81.51 kJ/mol,从反应动力学上证明了朝鲜无烟煤燃烧特性较差;对于三种升温速率下最适合的反应机理模型,KA的实验数据与理论模型A3/2,R3和A1拟合良好,而CA的实验数据与A3,A2和A3/2模型拟合良好,表示KA和CA一般遵循随机核形成及生长反应机理,KA的反应级数小于CA的反应级数。The combustion characteristics and combustion reaction kinetic parameters are the essential data affecting the thermal calculation,design and numerical simulation of anthracite pulverized coal-fired combustion devices.The combustion experiments using DPR Korea's anthracite(KA)were carried out on a thermogravimetric analyzer under the air atmosphere at the heating rates of 10℃/min,20℃/min and 30℃/min respectively(up to 1200℃).Meanwhile,one kind of Chinese anthracite(CA)was also tested and the results were compared.The combustion characteristic indexes of KA and CA were calculated based on the characteristic parameters obtained from experimental data.Besides,the kinetic parameters were estimated using the Flynn-Wall-Ozawa(FWO)and Kissinger-Akahira-Sunose(KAS)methods based on iso-conversional principle.Results show that the heating rate has an important effect on the ignition performance of KA and CA.The ignition performance index of KA and CA was improved more obviously with the increase in heating rate.All indexes of KA combustion performance are lower than those of CA,which means that KA is harder to burn than CA.The average apparent activation energy of KA is 112.13 kJ/mol,which is significantly higher than that of CA(81.51 kJ/mol),indicating the poor combustion profile of KA.In terms of the reaction mechanism models simulated at three heating rates,the experimental data of KA fit well with the theoretical models A3/2,R3 and A1,while the data of CA fit well with the A3,A2 and A3/2 models.These results show that the combustion of KA and CA might be directed with the mechanism of random nuclear formation and growth reaction,and the reaction order of KA is smaller than that of CA.

关 键 词：无烟煤 燃烧特性 热重分析 TG-DTG 动力学 

分 类 号：TQ533[化学工程—煤化学工程]