白马600MW超临界CFB锅炉二次风系统均匀性试验与数值模拟  

Experimental and Numerical Simulation on the Uniformity of Secondary Air System of Baima 600MW Supercritical CFB Boiler

作　　者：周金良 王泉海[1] 严谨[1] 郭强[1] 吕卓 张弋 卢啸风[1] 

机构地区：[1]低品位能源利用技术及系统教育部重点实验室(重庆大学)

出　　处：《中国电机工程学报》2018年第2期406-412,共7页Proceedings of the CSEE

基　　金：国家重大研发计划项目(2016YFB0600201)~~

摘　　要：循环流化床作为一种新型洁净燃烧技术,具有燃烧效率高、燃料适应性广和污染物排放低等特点。循环流化床在大型化的过程中面临着燃烧均匀性问题,而这与二次风的均匀性密切相关。文中以白马600 MW超临界CFB锅炉二次风系统为研究对象,通过实炉试验测量与数值模拟方法,发现现有二次风系统存在二次风分布不均的现象。实炉冷态测量显示采用支管风门挡板调节可以提高二次风均匀性,且在现有机组上易实施,但会增加支管流动阻力。通过数值模拟方法对二次风系统进行研究,结果表明通过调整部分支管阻力,可使优化后的二次风系统出口速度偏差率均小于5%,其适用于新机组设计。As a new type of clean combustion technology, circulating fluidized bed is characterized by high combustion efficiency, wide burnable suitability and low pollutant emission. The circulating fluidized bed development is in the direction of boilers with large-scale parameters and capacity. At the same time, circulating fluidized bed is confronted with the uneven combustion problem, which have close correlation with the uniformity of secondary air system. The research object of this paper is the secondary air system of Baima 600MW supercritical CFB boiler. Through experimental measurement and numerical simulation method, it is found that secondary air distribution of the existing system is uneven. The measurement results of cold-state furnace show that the air damper adjustment could improve the uniformity of the secondary air and it is easy to implement on the existing unit. However, it would also increase flow resistance of the branch pipe. By numerical simulation method, the secondary air system was studied, and the results show that the exit velocity deviation rate of the secondary air system could less than 5% by adjusting the resistance of partial branch pipe. This improvement method is suitable for the new unit design.

关 键 词：超临界循坏流化床(CFB)锅炉 二次风系统 均匀性 偏差 优化设计 流动阻力 

分 类 号：TM0[电气工程—电工理论与新技术]