适用于脱硝的三种新型波形传热元件的流动传热性能分析  

Thermal-flow performances of three waveform heat transfer components for dentrification

作　　者：李鹏程[1] 陈健 孙志坚[1] 黄风良 黄浩[1] 胡亚才[1] 

机构地区：[1]浙江大学热工与动力系统研究所,浙江杭州310027 [2]杭州富尔顿热能设备有限公司,浙江杭州310027

出　　处：《能源工程》2015年第3期43-48,共6页Energy Engineering

基　　金：浙江省金华市科学技术研究计划重点项目(20131031)

摘　　要：针对脱硝后由于工况的变化,空气预热器的冷热段对传热和阻力有不同的需求,提出了三种不同波形(DE-1、DE-2和DE-3)的新型传热元件来适应脱硝后的这种变化。不同雷诺数下的试验结果表明DE-1的传热性能优于DE-2和DE-3,DE-3阻力性能最好。分析认为DE-3适用于空气预热器的热段,DE-1适用于冷段。实例计算结果表明,热段采用DE-3,冷段采用DE-1可以有效地缓解空气预热器脱硝过程中的堵灰和冷段腐蚀问题,适用于冷段和热段的脱硝。试验结果可为优化空气预热器的传热元件提供一定的理论支持。Condition of air preheater has changed after-denitrification,so that the hot end and cool end of air preheater has different requirement. Three waveforms（ DE-1、DE-2、DE-3） were proposed to meet the hot end and cool end of air preheater after denitrification. The convective heat transfer coefficient was got by taking experiences of different Reynolds numbers. The heat transfer performance of DE-1 was found that it was superior compared with the others,but the resistance property of DE-3 was the best. The relations of f and j factor about the Re number was fitted out. In order to improve the accuracy of the experimental results,error analysis of experimental data was proposed. DE-1 and DE-3were proved that they were suitable for easing ash clogging and corrosion. Experimental results can provide supports for optimizing the design and analysis the performance of the air preheater heat transfer element.

关 键 词：脱硝 波形 柯本j因子 阻力系数f 误差分析 

分 类 号：TK124[动力工程及工程热物理—工程热物理]