本文主要研究内容
作者张恬,闫凯,乌晓江,韩志江,周月桂（2019）在《O2/CO2气氛下烟气物性参数对燃煤锅炉对流传热影响的模拟研究》一文中研究指出：新疆准东煤作为一种可开发利用前景广阔的高碱金属煤种,易沾污结渣特性极大限制了其高效利用。前人大量研究了准东煤在常规气氛下的燃烧特性,但鲜见其在富氧气氛下的燃烧和传热特性研究。为了研究富氧气氛下燃用准东煤对碱金属释放及换热器传热性能的影响,运用化工流程分析软件Aspen Plus建立空气和富氧气氛下准东煤燃烧工艺流程模型并进行反应模拟。通过控制氧燃比恒定并调节O2/CO2配比进行变工况分析,使准东煤燃烧绝热火焰温度与空气气氛下较为接近,对应工况下锅炉内具有相似的温度分布。借助吉布斯反应器模拟得出反应物系在满足相平衡和化学平衡的条件下所得产物组分及状态参数、Na元素的赋存与转化规律,为预测Na元素释放形式提供参考。由于富氧燃烧烟气富含高浓度CO2且水蒸气含量增加,富氧燃烧方式下燃煤烟气的传热特性将发生显著差异。运用带有Boston-Mathiasα函数的Peng-Robinson立方状态方程（PR-BM物性方法）对准东煤在空气和富氧气氛下燃烧产生的烟气进行物性估算,对比分析不同气氛下烟气密度、比热容、导热系数、黏度随温度的变化规律,为分析空气及富氧气氛下准东煤燃烧烟气的对流传热特性差异提供更为准确的参数。采用外掠管束强制对流传热修正计算方法分析了不同燃烧气氛下锅炉烟道内各对流受热面的传热性能。并采用CFD软件对一束高温再热器管屏进行"烟气-管壁-蒸汽"流固耦合传热数值模拟,对比空气及富氧气氛下燃煤烟气物性参数对换热器传热系数的影响。结果表明:40%O2/60%CO2气氛下,Na元素释放规律与21%O2/79%N2基本一致。随着烟温的降低,Na存在形式逐渐由NaCl和NaOH向Na2SO4转变。但烟气再循环的富集作用会加剧准东煤灰沾污结渣。由于富氧燃煤烟气中三原子气体浓度增加,物性参数发生变化使得对流传热性能增强,各对流受热面传热系数为常规工况的1. 24～1. 27倍。在换热器结构和烟气及蒸汽入口流速、温度相同时,富氧工况下再热器各管圈对流传热系数较常规工况增加约21. 43 W/（m2·K）,出口蒸汽平均温度提高约11. 32 K。
Abstract
xin jiang zhun dong mei zuo wei yi chong ke kai fa li yong qian jing an kuo de gao jian jin shu mei chong ,yi zhan wu jie zha te xing ji da xian zhi le ji gao xiao li yong 。qian ren da liang yan jiu le zhun dong mei zai chang gui qi fen xia de ran shao te xing ,dan xian jian ji zai fu yang qi fen xia de ran shao he chuan re te xing yan jiu 。wei le yan jiu fu yang qi fen xia ran yong zhun dong mei dui jian jin shu shi fang ji huan re qi chuan re xing neng de ying xiang ,yun yong hua gong liu cheng fen xi ruan jian Aspen Plusjian li kong qi he fu yang qi fen xia zhun dong mei ran shao gong yi liu cheng mo xing bing jin hang fan ying mo ni 。tong guo kong zhi yang ran bi heng ding bing diao jie O2/CO2pei bi jin hang bian gong kuang fen xi ,shi zhun dong mei ran shao jue re huo yan wen du yu kong qi qi fen xia jiao wei jie jin ,dui ying gong kuang xia guo lu nei ju you xiang shi de wen du fen bu 。jie zhu ji bu si fan ying qi mo ni de chu fan ying wu ji zai man zu xiang ping heng he hua xue ping heng de tiao jian xia suo de chan wu zu fen ji zhuang tai can shu 、Nayuan su de fu cun yu zhuai hua gui lv ,wei yu ce Nayuan su shi fang xing shi di gong can kao 。you yu fu yang ran shao yan qi fu han gao nong du CO2ju shui zheng qi han liang zeng jia ,fu yang ran shao fang shi xia ran mei yan qi de chuan re te xing jiang fa sheng xian zhe cha yi 。yun yong dai you Boston-Mathiasαhan shu de Peng-Robinsonli fang zhuang tai fang cheng （PR-BMwu xing fang fa ）dui zhun dong mei zai kong qi he fu yang qi fen xia ran shao chan sheng de yan qi jin hang wu xing gu suan ,dui bi fen xi bu tong qi fen xia yan qi mi du 、bi re rong 、dao re ji shu 、nian du sui wen du de bian hua gui lv ,wei fen xi kong qi ji fu yang qi fen xia zhun dong mei ran shao yan qi de dui liu chuan re te xing cha yi di gong geng wei zhun que de can shu 。cai yong wai lve guan shu jiang zhi dui liu chuan re xiu zheng ji suan fang fa fen xi le bu tong ran shao qi fen xia guo lu yan dao nei ge dui liu shou re mian de chuan re xing neng 。bing cai yong CFDruan jian dui yi shu gao wen zai re qi guan bing jin hang "yan qi -guan bi -zheng qi "liu gu ou ge chuan re shu zhi mo ni ,dui bi kong qi ji fu yang qi fen xia ran mei yan qi wu xing can shu dui huan re qi chuan re ji shu de ying xiang 。jie guo biao ming :40%O2/60%CO2qi fen xia ,Nayuan su shi fang gui lv yu 21%O2/79%N2ji ben yi zhi 。sui zhao yan wen de jiang di ,Nacun zai xing shi zhu jian you NaClhe NaOHxiang Na2SO4zhuai bian 。dan yan qi zai xun huan de fu ji zuo yong hui jia ju zhun dong mei hui zhan wu jie zha 。you yu fu yang ran mei yan qi zhong san yuan zi qi ti nong du zeng jia ,wu xing can shu fa sheng bian hua shi de dui liu chuan re xing neng zeng jiang ,ge dui liu shou re mian chuan re ji shu wei chang gui gong kuang de 1. 24～1. 27bei 。zai huan re qi jie gou he yan qi ji zheng qi ru kou liu su 、wen du xiang tong shi ,fu yang gong kuang xia zai re qi ge guan juan dui liu chuan re ji shu jiao chang gui gong kuang zeng jia yao 21. 43 W/（m2·K）,chu kou zheng qi ping jun wen du di gao yao 11. 32 K。
论文参考文献
论文详细介绍
论文作者分别是来自洁净煤技术的张恬,闫凯,乌晓江,韩志江,周月桂，发表于刊物洁净煤技术2019年01期论文，是一篇关于准东煤论文,富氧燃烧论文,碱金属论文,物性参数论文,对流传热论文,高温再热器论文,洁净煤技术2019年01期论文的文章。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，资料来自洁净煤技术2019年01期论文网站，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。
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