一次风通道出口位置对燃烧器出口流场及混合特性影响的试验研究  

Experimental Study on the Effects of Primary Air Duct Outlet Location on Flow and Mixing Characteristics of a Burner

作　　者：遆曙光 王浩鹏 陈智超[2] 李争起[2] TI Shu-guang;WANG Hao-peng;CHEN Zhi-chao;LI Zheng-qi(College of Building Environment Engineering,Zhengzhou University of Light Industry,Zhengzhou,China,Post Code:450002;Faculty of Energy Science and Engineering,Harbin Institute of Technology,Harbin,China,Post Code:150001)

机构地区：[1]郑州轻工业大学建筑环境工程学院,河南郑州450002 [2]哈尔滨工业大学能源科学与工程学院,黑龙江哈尔滨150001

出　　处：《热能动力工程》2020年第9期58-64,共7页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金(51806201);河南省科技攻关项目(182102310029);郑州轻工业大学博士基金项目(2015BSJJ068)。

摘　　要：针对某电厂600 MW机组IHI-FWSK墙式对冲锅炉,为解决燃烧器出口烟气温度过高问题,借助单相冷态流场示踪试验系统和一、二次风混合特性试验系统揭示不同一次风通道出口位置结构下燃烧器出口流场和一、二次风混合特性,并通过工业测量获得燃烧器出口烟气温度分布和NOx排放特性。试验结果表明:一次风通道出口缩短50 mm,回流区在轴线上起始点向喷口方向移动50 mm,而中心回流区最大直径、长度及射流扩展角度受其变化影响很小;一次风通道出口位置为-25、0和25 mm三种结构在燃烧器出口一次风最高相对剩余温度分别为0.63、0.67和0.78,说明25 mm结构一次风中煤粉浓度最高,有利于实现燃料浓淡分级燃烧,抑制NOx生成。冷态模化试验所得出的优化结构参数在600 MW机组锅炉的应用表明:燃烧器一次风通道出口位置延长0.1 m后,燃烧器出口烟气温度降低296℃,有效地防止燃烧器喷口烧坏;同时锅炉NOx排放量由344 mg/m^3降低至313 mg/m^3。In order to reduce the high flue gas temperature at the burner outlet of IHI-FWSK opposed wall boiler of 600 MW unit in a power plant,the flow field at the burner outlet and the mixing characteristics of primary and secondary air are revealed by using single phase cold flow tracing experimental system and mixing characteristics test system.The flue gas temperature distribution at the burner outlet and NOx emission of the boiler are obtained by industrial measurement.The results show that with primary air duct outlet location shortened by 50 mm,the starting point of central recirculation zone moves 50 mm towards the nozzle,while the maximum diameter,length and jet expansion angle of the central return area are little affected by the change.The maximum primary air relative residual temperature at the burner outlet is 0.63,0.67 and 0.78 for its outlet location of-25 mm,0 mm and 25 mm,respectively.The 25 mm case has the highest concentration in the primary air,which is conducive to the realization of dense lean staged combustion of fuel and the inhibition of NOx generation.Finally,the optimized structural parameters obtained from the cold model test are applied to the 600 MW unit boiler.After the primary air duct outlet location of the burner is extended by 0.1 m,the flue gas temperature at the outlet of the burner is reduced by 296℃,effectively preventing the burner nozzle from burning out.Meanwhile,the NOx emission of the boiler is reduced from 344 mg/m^3 to 313 mg/m^3.

关 键 词：旋流燃烧器 一次风结构 流动特性 混合特性 NO_x 

分 类 号：TK221[动力工程及工程热物理—动力机械及工程]