超临界П型锅炉煤质变化对锅炉换热的影响分析  

Coal Variation Impact on Boiler Heat Transfer for USC Pressure Two-pass Type Boilers

作　　者：郭飞 宋宝军[1,2] 张鑫莆 GUO Fei;SONG Bao-jun;ZHANG Xin-pu(State Key Laboratory of Efficient and Clean Coal-fired Utility Boilers;Harbin Boiler Co.,Ltd.)

机构地区：[1]高效清洁燃煤电站锅炉国家重点实验室,黑龙江哈尔滨150046 [2]哈尔滨锅炉厂有限责任公司

出　　处：《电站系统工程》2022年第2期41-42,45,共3页Power System Engineering

基　　金：黑龙江省自然科学基金杰出青年项目(JQ2021E004)资助。

摘　　要：电站锅炉运行中,不同煤质对锅炉换热特性影响较大,以350 MW超临界锅炉为例,提出煤质U_(RC)特征值为末级再热器和水冷壁系热量比例关系,以U_(RC)表征煤质在锅炉内的对流换热与辐射换热特性,分析了煤质碳元素含量、氢元素含量及水分含量变化时U_(RC)的变化特性。当U_(RC)提高时,对流换热特性增强;当U_(RC)降低时,对流换热特性减弱。并根据煤质U_(RC)的变化,讨论了锅炉运行手段。During the operation of utility boilers,massive impact on heat exchange will be brought by coal change.Takes350MW ultra-supercritical (USC) boiler as an example,puts forward that the characteristic value U_(RC)is the heat absorption ratio of final reheater (RH) to waterwall,in which the U_(RC)presents heat transfer characteristics of both convective heat transfer and radiation heat transfer.The U_(RC)variation characteristics are investigated during the variations of carbon element,hydrogen element and moisture content.When U_(RC)increases,convective heat transfer is intensified.When U_(RC)drops,convective heat transfer is cut down.Operational methods are discussed in line with the coal change.

关 键 词：煤质变化 煤质U 值 换热特性 锅炉运行 

分 类 号：TK227[动力工程及工程热物理—动力机械及工程]