基于正交实验法提高省煤器灰斗飞灰捕集性能的优化设计  

The Optimization Design of Economizer Hopper to Improve the Fly Ash Particle Capture Performance Based on Orthogonal Experiment

作　　者：张千 许文良[2] 杨新[2] 

机构地区：[1]神华国华(北京)电力研究院有限公司,北京100016 [2]华北电力大学能源动力与机械工程学院,河北保定071003

出　　处：《电力科学与工程》2017年第12期44-49,共6页Electric Power Science and Engineering

摘　　要：为研究在省煤器灰斗内加装撞击分离器和隔舱对>90μm飞灰的捕集性能,采用正交试验法和数值模拟相结合的方法,研究不同的参数组合的飞灰捕集效能。实验结果表明:方案7能够有效提升省煤器灰斗的飞灰捕集效率,对原灰的捕集效率约能提高2.29倍,对>90μm的飞灰颗粒捕集效率约能提高2.45倍;采用正交实验法和数值模拟的分析结果,最优的隔舱和撞击分离器的结构参数组合为A1B3C1D2;角度α是对飞灰捕集效率影响显著的因素,长度L也起到了重要作用,这说明了撞击分离器是提高飞灰捕集效率的关键部件,能够决定气流在灰斗中的流向及流程。In order to study the trapping efficiency against the fly ash with its ash diameter bigger than 90 μm in the impact separator and compartment in the economizer hopper,the orthogonal test combined numerical simulation method was adapted to study the effects of different parameters combination. The experimental results show that scheme 7 can effectively improve the trapping efficiency against the fly ash of economizer hopper. The trapping efficiency of fly ash particle collection is improved by about 2. 29 times,while the trapping efficiency of fly ash particle collection with its diameter bigger than 90 μm is increased by about 2. 45 times. By means of orthogonal experiment and numerical simulation,the optimal combination of the structural parameters of the impact separator and compartment is A1 B3 C1 D2.The angle α is a significant factor affecting the fly ash trapping efficiency,and the length L also plays an important role. The findings above show that the key component to improve the trapping efficiency against fly ash is the impact separator,which can determine the flow direction and process in the hopper.

关 键 词：正交试验 省煤器灰斗 飞灰捕集 

分 类 号：X701[环境科学与工程—环境工程]