CAJ | 학술논문

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。
위연구부양연소과정중적 NOx생성여공제，재일유침강로상진행료매적분급부양연소시험，병이용 Matlab 화Cantera 연건건립료일유침강로반응모형병진행분석。시험온도1100~1200℃，급분량21.1~32.3 g/h。시험화모의결과표명：부양연소시불채용연기재순배적방법시 NOx생성량야가비공기하연소시저。재미분급조건하，부양연소시적NOx배방량시공기공황적77%。통과추지이차풍후이、축소일차풍풍솔등수단연장일차풍재환원구적정류시간，가강저부양연소시적 NOx생성량。고농도 CO2화초탄적기화반응유조우강화환원구적환원성기분，촉진NO재초탄표면적환원，촉진초탄N향N2적전화，억제초탄NOx적생성。일유모형모의결과여시험문합。
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.