生活垃圾焚烧烟气再循环率影响因素研究及应用
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摘要
城市生活垃圾在焚烧炉中燃烧时,会产生NO_X等一系列污染物。随着烟气排放标准的提高,如何通过燃烧技术抑制NO_X的生成成为重点。提出烟气再循环技术,即将焚烧系统中燃烧产生的部分烟气从袋式除尘器出口引至焚烧炉内,代替部分或全部二次风,与炉内烟气相互扰动并充分混合,形成还原性气氛,可抑制烟气中NO_X的生成,同时降低排烟损失,提高经济效益。通过数值模拟和设计计算,来分析影响烟气再循环率的因素;并结合实例,采用烟气再循环技术对降低NO_X的排放,提高锅炉效率所起到的显著效果。
A series of pollutants, such as NO_X, could be produced when municipal solid waste is burned in an incinerator. With the improvement of flue gas emission standard, how to inhibit NO_X through burning technology become the focus. In this paper, flue gas recycling technology was proposed. That is, in the incineration system, part of exhaust gas is leaded to the inner of incinerator from the outlet of bag filter to replace part or all of second air, and to disturb and mix with the incineration flue gas, which will form a reducing atmosphere to help suppress the generation of NO_X and reduce flue gas exhaust, so as to improve economic benefits. This study combined numerical simulation and design calculations to analyze the factors related to Exhaust Gas Recirculation(EGR) rate. Through studies of specific examples, the EGR has been proven to have a significant effect on reducing NO_X emission and improving boiler efficiency.
A series of pollutants, such as NO_X, could be produced when municipal solid waste is burned in an incinerator. With the improvement of flue gas emission standard, how to inhibit NO_X through burning technology become the focus. In this paper, flue gas recycling technology was proposed. That is, in the incineration system, part of exhaust gas is leaded to the inner of incinerator from the outlet of bag filter to replace part or all of second air, and to disturb and mix with the incineration flue gas, which will form a reducing atmosphere to help suppress the generation of NO_X and reduce flue gas exhaust, so as to improve economic benefits. This study combined numerical simulation and design calculations to analyze the factors related to Exhaust Gas Recirculation(EGR) rate. Through studies of specific examples, the EGR has been proven to have a significant effect on reducing NO_X emission and improving boiler efficiency.
引文
[1] 白良成. 生活垃圾焚烧处理工程技术[M].北京:中国建筑工业出版社,2009.
[2] 张健东.烟气再循环技术在垃圾焚烧中的效果分析[J].山东工业技术,2014,(10):136.
[3] 王子刚. 垃圾焚烧电厂烟气再循环脱除NOX技术研究[J].2017,(10):220.
[4] 王东风,叶蕤,牟立群. 低氮燃烧技术在垃圾焚烧锅炉领域中的成功应用[J].工业锅炉,2014,(5):45-47.
[2] 张健东.烟气再循环技术在垃圾焚烧中的效果分析[J].山东工业技术,2014,(10):136.
[3] 王子刚. 垃圾焚烧电厂烟气再循环脱除NOX技术研究[J].2017,(10):220.
[4] 王东风,叶蕤,牟立群. 低氮燃烧技术在垃圾焚烧锅炉领域中的成功应用[J].工业锅炉,2014,(5):45-47.