双炉膛四角切圆煤粉锅炉分层掺烧数值模拟及性能试验研究  

Numerical Simulation and Performance Tests on Layered-combustion in a Tangential Coal-fired Double-furnace Boiler

作　　者：梁绍华[1] 宁新宇[1] 张恩先[1] 黄磊[1] 周昊[2] 岑可法[2] 

机构地区：[1]江苏方天电力技术有限公司,江苏省南京市211102 [2]能源清洁利用国家重点实验室(浙江大学),浙江省杭州市310027

出　　处：《中国电机工程学报》2011年第26期9-15,共7页Proceedings of the CSEE

摘　　要：神华煤容易结焦,单独燃烧可能影响锅炉的安全运行。在一台容量为1025t/h的双炉膛锅炉上,对容易结焦的神华煤和不易结焦的平混煤进行了分层掺烧的数值模拟和性能试验研究,在数值模拟中研究了炉膛内的速度场和温度场的分布,在性能试验中研究了不同掺烧比例下锅炉燃烧特性、排放特性及经济性。研究结果表明:神华煤掺烧量的增多和分层时燃烧位置的提高将导致炉膛结焦倾向增大、NOx浓度下降,但对锅炉热效率影响不明显。并且在不同的分层掺烧方式下,二次风的配风方式有不同的优化值,应通过优化调整试验确定。The boiler would suffer severe ash deposition propensity when only Shenhua coal with low ash fusion temperature was supplied. Taking Shenhua coal with low ash fusion temperature and Pinghun coal with high ash fusion temperature as fuel in a 1 025 t/h double-furnace boiler, the numerical simulation and performance tests of layered-combustion were performed. The velocity and temperature distribution of furnace area were analysed by numerical simulation, the characteristic of combustion, emission and economy were studied by performance tests. The research results show that the increase of Shenhua coal＇s quantity proportion in total coal supply and the heightening of Shenhua coal＇s burning layer position in the boiler combustion system would make ash deposition propensity more seriously and NOx emission decrease, but boiler efficiency wasn＇t influenced obviously. When Shenhua coal was fired on different burning layers or the proportion in total coal supply was changed, the optimization of distribution of secondary air should be obtained by adjustment tests.

关 键 词：双炉膛 四角切圆锅炉 分层掺烧 神华煤 数值模拟 试验研究 

分 类 号：TK224.2[动力工程及工程热物理—动力机械及工程]