基于CFD的城市生活垃圾焚烧炉燃烧优化  

Combustion Optimization of Municipal Solid Waste Incinerator Based on CFD

作　　者：马晓茜[1] 刘国辉[1] 余昭胜[1] 

机构地区：[1]华南理工大学电力学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2008年第2期101-106,共6页Journal of South China University of Technology(Natural Science Edition)

基　　金：广东省自然科学基金研究团队资助项目(003045)

摘　　要：由于我国城市生活垃圾水分高、热值低且成分复杂多变,致使其在焚烧炉内燃烧时很不稳定.文中运用计算流体力学（CFD）技术,在入炉垃圾成分不变的条件下,对某城市生活垃圾焚烧炉进行燃烧调整研究.在保持一、二次风比率不变的情况下,通过调整一次风各风室的给风率,采用扩散的床层模型和组分运输模型计算出了不同配风条件下床层表面的烟气组分、温度及床层上方燃烧炉膛的温度分布.计算结果表明：一次风各风室（1^#～5^#风室）送风比率的变化会对垃圾焚烧炉内的气相燃烧、炉膛温度及流场产生较大的影响,但对焦炭的燃烬影响小;当一次风各风室送风比率为1.4∶2.8∶2.8∶2∶1时,焚烧炉燃烧炉膛的温度为1 085.7K,灰渣中可燃物含量为3.19%,计算结果与实际测量值吻合.In China, the combustion of municipal solid waste （MSW） in the incinerator is unstable due to the high moisture, low heat value and various compositions of the waste. In order to solve this problem, the method of computational fluid dynamics （CFD） is adopted to optimize the incineration of MSW with invariable composition. At a constant flow ratio of the primary air to the secondary air, a diffusion model for the packed bed and a transportation model for the components are established by adjusting the feeding ratio of the primary air in each air chamber. The two models are then used in different air distribution conditions to calculate the components and temperature of the gas on the bed surface as well as the temperature distribution in the furnace over the bed. Calculated results show that the variation of flow ratios in different air chambers greatly affects the gas combustion, furnace temperature and flow field in the incinerator, but slightly affects the burn-out performance of coke. Moreover, at a flow ratio of 1.4： 2. 8： 2.8： 2： 1, the furnace temperature in the incinerator reaches 1085.7K and the content of unburned carbon in the ash is up to 3.19 %. The calculated results accord well with the measured ones.

关 键 词：焚烧炉 燃烧优化 数值模拟 城市生活垃圾 

分 类 号：TK227.1[动力工程及工程热物理—动力机械及工程]