分级富氧燃烧控制NO_x的一维模型和试验研究  

One-dimensional Model and Experimental Study of NO_x Control by Staged Oxy-fuel Combustion

作　　者：游卓[1] 周志军[1] 王智化[1] 胡昕[1] 朱燕群[1] 周俊虎[1] 岑可法[1] 

机构地区：[1]能源清洁利用国家重点实验室(浙江大学),浙江省杭州市310027

出　　处：《中国电机工程学报》2014年第26期4462-4468,共7页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划(973计划)项目(2012CB214906)~~

摘　　要：为研究富氧燃烧过程中的 NOx生成与控制，在一维沉降炉上进行了煤的分级富氧燃烧试验，并利用 Matlab 和Cantera 软件建立了一维沉降炉反应模型并进行分析。试验温度1100~1200℃，给粉量21.1~32.3 g/h。试验和模拟结果表明：富氧燃烧时不采用烟气再循环的方法时 NOx生成量也可比空气下燃烧时低。在未分级条件下，富氧燃烧时的NOx排放量是空气工况的77%。通过推迟二次风后移、缩小一次风风率等手段延长一次风在还原区的停留时间，可降低富氧燃烧时的 NOx生成量。高浓度 CO2和焦炭的气化反应有助于强化还原区的还原性气氛，促进NO在焦炭表面的还原，促进焦炭N向N2的转化，抑制焦炭NOx的生成。一维模型模拟结果与试验吻合。ABSTRACT：NOx control during staged oxy-fuel combustion was studied through drop-tube furnace and one dimensional model. The model was coded in Matlab software and the Cantera code was adopted. The temperature and flow rate of fuel were 1100~1200℃ and 21.1~32.3g/h respectively. The result shows that NOx emission during non-staged oxy-fuel combustion is lower than that in air. NOx formation is decreased by increasing residence time in reductive zone, such as by delaying input of the secondary stream and/or by decreasing the rate of the first stream. Char is gasified by CO2 during oxy-fuel combustion. NOx emission is then reduced due to more reductive primary zone, because more NO is reduced by char and more char-N was converted to N2. The results of one dimensional model agree well with the test results.

关 键 词：分级富氧燃烧 沉降炉 一维模型 Cantera软件 

分 类 号：TK16[动力工程及工程热物理—热能工程]