链条炉横向配风不均匀性的研究  

An Investigation of the Non-uniformity of Transversal Air Distribution for a Chain Grate Stoker

作　　者：常兵[1] 虞亚辉[1] 季俊杰[1] 王清成[1] 

机构地区：[1]上海交通大学热能工程研究所,上海200240

出　　处：《热能动力工程》2007年第3期288-291,共4页Journal of Engineering for Thermal Energy and Power

基　　金：上海市科委重大科技攻关基金资助项目(05dz12028)

摘　　要：横向配风不均匀性会严重影响链条炉效率。针对此问题,对一台20t/h链条炉供风系统进行了7个工况的实炉冷态试验,结果表明炉排的侧密封不严和风门变形是造成配风不均的主要原因。以实测数据为边界条件,采用k-ε湍流模型对单风室内部气体流动进行数值模拟,发现扩流压降、动压转化为静压、以及风室内涡流扰动是造成横向配风不均的内在原因。结合国内研究的大风仓小风斗供风系统以及国外垃圾焚烧炉的下饲式供风形式的各自优点,提出了下饲式大风仓小风斗供风系统。对这两种大风仓小风斗进行的数值模拟表明,改进后的供风系统能有效地提高横向配风的均匀性。The non-uniformity of transversal air distribution in a chain grate stoker can seriously affect the stoker efficiency. To solve this problem, real stoker cold-state tests have been performed of the air supply system of a 20 t/h chain grate stoker in 7 operating regimes. The test results show that the unsatisfactory lateral seal of the grate and air damper deformation are the main causes leading to the non-uniformity of air distribution. With the actually measured data serving as boundary conditions, a numerical simulation was conducted of air flow in a single wind box by employing a k-ε turbulence model. It has been found that the diffusion-flow pressure drop and a conversion from a kinetic pressure to a static one as well as a turbulence perturbation in the wind box can cause the non-uniformity of transversal air distribution. In the light of the respective merits of large-air-box and small-air-funnel air supply system developed in China and underfeed air supply mode of foreign-made incinerators, proposed was an air supply system incorporating an underfeed large-air-box and small-air-funnel. A numerical simulation of the above two kinds of air supply system indicates that the improved air supply system can effectively enhance the uniformity of transversal air distribution.

关 键 词：链条炉 冷态试验 横向配风 数值模拟 

分 类 号：TK229.61[动力工程及工程热物理—动力机械及工程]