基于准东煤富氧燃烧的660 MW超超临界锅炉热力系统结构优化分析  

Structure Optimization Analysis of Thermal System in a 660 MW Ultra-supercritical Boiler with Zhundong Coal Oxygen-enriched Combustion

作　　者：卢雄 魏博[1] 王建江 程泽宁 刘坤朋 LU Xiong;WEI Bo;WANG Jianjiang;CHENG Zening;LIU Kunpeng(State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources,School of Chemical Engineering and Technology,Xinjiang University,Urumqi 830046,China;Xinjiang Tianchi Energy Sources Co.,Ltd.,Changji 831100,Xinjiang Province,China)

机构地区：[1]新疆大学化工学院,碳基能源资源化学与利用国家重点实验室,乌鲁木齐830046 [2]新疆天池能源有限责任公司,新疆昌吉831100

出　　处：《动力工程学报》2023年第10期1276-1284,共9页Journal of Chinese Society of Power Engineering

基　　金：庭州青年计划资助项目(2021QN08)。

摘　　要：为在已建成锅炉上开展富氧燃烧,以燃用准东煤的某台660 MW超超临界燃煤锅炉为研究对象,构建了准确的热力计算模型,分析了不同氧气体积分数下各级受热面传热特性的变化情况。基于计算结果,提出了各受热面的结构优化方案。结果表明:当氧气体积分数从21%增加至30%时,高温过热器受热面的传热量增加20.08%,高温再热器受热面的对流传热量增加28.90%,低温再热器受热面的对流传热量减少6.72%,低温过热器受热面的对流传热量减少9.90%,省煤器受热面的对流传热量减少13.72%;在结构优化后,烟气流通截面积平均值减小了27.50%,而各级受热面面积平均值减小了15.10%。In order to conduct the oxygen-enriched combustion in the existing boilers,an accurate thermal calculation model was built according to a 660 MW ultra-supercritical Zhundong coal-fired boiler.The change of heat transfer characteristics in heating surface at different oxygen volume fractions was analyzed.In terms of the calculation results,the structure optimization schemes of heating surface were proposed.Results show that when the oxygen volume fraction increases from 21%to 30%,the heat transfer of high temperature superheater increases by 20.08%,while the convective heat transfer of high temperature reheater rises by 28.90%;the convective heat transfer of low temperature reheater,low temperature superheater and economizer reduces by 6.72%,9.90%and 13.72%,respectively.After structure optimization,the average cross-sectional area of flue gas circulation decreases by 27.50%,while the average area of all heating surfaces reduces by 15.10%.

关 键 词：热力计算 富氧燃烧 传热特性 结构优化 

分 类 号：TK229.2[动力工程及工程热物理—动力机械及工程]