掺烧污泥煤粉锅炉燃烧特性的数值模拟  

Co-combustion of sludge in a 100 MW unit coal-fired boiler: numerical simulation

作　　者：殷立宝[1] 朱天宇[2] 张成[2] 方庆艳[2] 徐齐胜[1] 陈刚[2] 

机构地区：[1]广东电网公司电力科学研究院,广东广州510080 [2]华中科技大学煤燃烧国家重点实验室,湖北武汉430074

出　　处：《热力发电》2015年第3期28-33,41,共7页Thermal Power Generation

基　　金：国家自然科学基金资助项目(51006042);广东省省部产学研结合项目(2012B091000166);华中科技大学自主创新基金(2013QN082)

摘　　要：采用单、双混合分数/PDF模型,对某台420 t/h四角切圆燃烧锅炉燃烧单煤和掺烧生活污泥进行了数值模拟,研究了炉内流动、燃烧和污染物排放特性。结果表明,在相同条件下燃烧单煤,锅炉70%负荷和100%负荷工况下的模拟数据与现场试验数据相符合;锅炉100%负荷下煤泥混烧时的NOx排放浓度低于燃烧单煤工况,随着污泥掺混比的增加煤粉燃尽率稍有下降,炉膛整体温度分布和烟气组分分布大致相同,对炉内流动、燃烧和污染物排放特性不会产生明显影响。Numerical simulation using single- and double-mixture-fraction / PDF（ Probability Density Function）transport model was carried out to evaluate the characteristics of coal burning alone and with domestic sludge on a420 t / h tangentially coal-fired boiler. The flow,combustion and NOxemission properties were investigated. The simulation results were consistent with the field test under the same working condition,when the coal was burned alone and the load is 70% and 100%. Under 100% load condition,the NOxemission reduced after co-combustion. With the increasing mass ratio of sludge,the burn out rate of coal decreased slightly. Temperature distribution and flue gas composition distribution in the furnace were roughly the same. All these above indicated that the co-combustion had little influence on characteristics of flow,combustion and NOxemission of this boiler.

关 键 词：锅炉 煤 污泥 混烧 燃烧特性 数值模拟 

分 类 号：TK16[动力工程及工程热物理—热能工程]