本文主要研究内容
作者杨琼（2019）在《燃煤锅炉CO排放特性的数值模拟》一文中研究指出：燃煤电厂多采用先进的低NOx燃烧器及炉内空气分级燃烧技术,以降低NOx的排放量。分级送风燃烧技术使得主燃烧器区域保持在缺氧、富燃料条件下燃烧,以控制NOx的生成。同时分级送风燃烧技术也会导致不完全燃烧或延迟燃烧现象,降低锅炉的燃烧效率。此外炉膛CO浓度升高且局部易出现峰值,易引发水冷壁的高温腐蚀问题。因此,研究燃煤锅炉中CO的生成机理及控制方法对提高火电机组运行经济性和环保性具有重要的工程价值。本文采用FLUENT数值模拟软件平台,以某400t/h四角切圆燃煤锅炉为研究对象,模拟炉膛燃烧的温度场和组分浓度场。由于本文以CO浓度为研究重点,因此为了较为准确地模拟出炉内CO的分布情况,加入改进的多步焦炭反应模型。为在不显著增加NOx生成的情况下,降低炉膛CO浓度,设计了两种燃烧改造方案,并模拟和分析了改造前后的流动与燃烧特性变化规律。第一种方案是通过改变单个燃烧器的水平角度来分析炉内的温度场,CO质量分数和NOx排放。通过优化调整,锅炉出口烟温降低,且有效地降低了 CO质量分数,同时也降低了炉膛NOx的排放浓度。第二种方案是在现有紧凑燃尽风(close-coupled overfire air,CCOFA)上部增加分离燃尽风(separated overfire air,SOFA),改变 CCOFA 与SOFA风配比以及SOFA风布置高度,以分析炉膛内温度、NOx浓度和CO浓度的变化规律。通过优化和调整,降低了炉膛出口处的烟气温度和NOx排放,有效降低了 CO出口浓度。两种方案均在一定程度上减少了煤粉不完全燃烧损失,避免燃烧区域出现高温腐蚀现象。说明调整燃烧器水平摆角和增设分离燃尽风是提高机组运行经济性和安全性的有效手段。
Abstract
ran mei dian an duo cai yong xian jin de di NOxran shao qi ji lu nei kong qi fen ji ran shao ji shu ,yi jiang di NOxde pai fang liang 。fen ji song feng ran shao ji shu shi de zhu ran shao qi ou yu bao chi zai que yang 、fu ran liao tiao jian xia ran shao ,yi kong zhi NOxde sheng cheng 。tong shi fen ji song feng ran shao ji shu ye hui dao zhi bu wan quan ran shao huo yan chi ran shao xian xiang ,jiang di guo lu de ran shao xiao lv 。ci wai lu tang COnong du sheng gao ju ju bu yi chu xian feng zhi ,yi yin fa shui leng bi de gao wen fu shi wen ti 。yin ci ,yan jiu ran mei guo lu zhong COde sheng cheng ji li ji kong zhi fang fa dui di gao huo dian ji zu yun hang jing ji xing he huan bao xing ju you chong yao de gong cheng jia zhi 。ben wen cai yong FLUENTshu zhi mo ni ruan jian ping tai ,yi mou 400t/hsi jiao qie yuan ran mei guo lu wei yan jiu dui xiang ,mo ni lu tang ran shao de wen du chang he zu fen nong du chang 。you yu ben wen yi COnong du wei yan jiu chong dian ,yin ci wei le jiao wei zhun que de mo ni chu lu nei COde fen bu qing kuang ,jia ru gai jin de duo bu jiao tan fan ying mo xing 。wei zai bu xian zhe zeng jia NOxsheng cheng de qing kuang xia ,jiang di lu tang COnong du ,she ji le liang chong ran shao gai zao fang an ,bing mo ni he fen xi le gai zao qian hou de liu dong yu ran shao te xing bian hua gui lv 。di yi chong fang an shi tong guo gai bian chan ge ran shao qi de shui ping jiao du lai fen xi lu nei de wen du chang ,COzhi liang fen shu he NOxpai fang 。tong guo you hua diao zheng ,guo lu chu kou yan wen jiang di ,ju you xiao de jiang di le COzhi liang fen shu ,tong shi ye jiang di le lu tang NOxde pai fang nong du 。di er chong fang an shi zai xian you jin cou ran jin feng (close-coupled overfire air,CCOFA)shang bu zeng jia fen li ran jin feng (separated overfire air,SOFA),gai bian CCOFA yu SOFAfeng pei bi yi ji SOFAfeng bu zhi gao du ,yi fen xi lu tang nei wen du 、NOxnong du he COnong du de bian hua gui lv 。tong guo you hua he diao zheng ,jiang di le lu tang chu kou chu de yan qi wen du he NOxpai fang ,you xiao jiang di le COchu kou nong du 。liang chong fang an jun zai yi ding cheng du shang jian shao le mei fen bu wan quan ran shao sun shi ,bi mian ran shao ou yu chu xian gao wen fu shi xian xiang 。shui ming diao zheng ran shao qi shui ping bai jiao he zeng she fen li ran jin feng shi di gao ji zu yun hang jing ji xing he an quan xing de you xiao shou duan 。
论文参考文献
论文详细介绍
论文作者分别是来自华北电力大学(北京)的杨琼，发表于刊物华北电力大学(北京)2019-10-28论文，是一篇关于空气分级燃烧论文,数值模拟论文,水平摆角论文,分离燃尽风论文,质量分数论文,华北电力大学(北京)2019-10-28论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自华北电力大学(北京)2019-10-28论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：空气分级燃烧论文; 数值模拟论文; 水平摆角论文; 分离燃尽风论文; 质量分数论文; 华北电力大学(北京)2019-10-28论文;