动力锅炉加热器壁温的改进计算方法  

An Improved Method for the Wall Temperature Calculating of Utility Boiler Heater

作　　者：国建刚[1] 刘晟斌 张卫军 

机构地区：[1]内蒙古电力勘测设计院,内蒙古呼和浩特010020 [2]哈尔滨电力设备总厂,黑龙江哈尔滨150040 [3]大唐国际发电股份有限公司张家口发电厂,河北张家口075133

出　　处：《哈尔滨理工大学学报》2009年第1期85-88,共4页Journal of Harbin University of Science and Technology

摘　　要：根据锅炉加热器进、出口压力降之间的关系,建立了其流量分配的非线性数学模型.该模型的经验参数较少,具有较高的计算精确度,并且可以求出加热器工质流量.此方法克服了目前常用的动力锅炉壁温计算方法中校核点工质流量与热负荷并不一定互相对应的缺点.针对330MW机组塔式燃煤直流锅炉过热器改造方案,利用提出的方法计算了100%与50%锅炉运行负荷下危险部位的壁温,结果表明,所有校核点的壁温都小于管材最高允许温度,计算方法是可行的.A nonlinear mathematical model is developed to determine the flow rate distribution in the interface of boiler heater by depending on the relation of pressure drop. Compared with the flow calculation model presently used by boiler manufactures, the proposed one introduces fewer experience parameters, which may result in higher accuracy. Flow rate in each tube can be obtained as well. This method avoids the non-correspondence between the flow rate and heat flux, which may exists in that used presently by boiler manufactures. It is employed to calculate the tube temperature of dangerous position that concerns the retrofit scheme of superheater of tower type coal-fired 330-MW once-through boiler for 100% and 50% operation load.

关 键 词：电站锅炉 加热器壁温 计算方法 

分 类 号：TK229[动力工程及工程热物理—动力机械及工程]