汽包锅炉蓄热系数的理论计算与分析  

Theoretical analysis and calculation of heat storage coefficient of drum boiler

作　　者：马博洋 MA Boyang(Datang Northeast Electric Power Experimental Research Institute Co.,Ltd.,Changchun 130012,China)

机构地区：[1]大唐东北电力实验研究院有限公司,吉林长春130012

出　　处：《热力发电》2020年第7期147-152,共6页Thermal Power Generation

摘　　要：计算蓄热系数的传统实验方法面临工作量大、准确率不高、实验条件有限等问题,故采取能量平衡原理的理论计算公式得出超临界汽包锅炉的蓄热系数,建立基于汽包、过热器和水冷壁的机理分析模型。利用某300 MW机组的锅炉运行规程计算了4种工况下的蓄热系数大小,并结合主蒸汽阀门开度的扰动实验结果,对机组实际运行的历史数据进行了分析。结果表明:汽包蓄热系数随压力的升高而增加;水冷壁蓄热系数的变化趋势随着压力的增加先变小,再加大;随着压力的增大,过热器蓄热系数随之增大,机组总的蓄热系数先减小,后增大。The conventional experimental methods of calculating heat storage coefficient have the problems of large workload,low accuracy and limited experimental conditions,so the theoretical calculation formula of energy balance principle is adopted to obtain the heat storage coefficient of drum boiler,and the mechanism analysis model based on drum,superheater and water wall is established.Based on the boiler operation rules of a 300 MW unit,the heat storage coefficient under four working conditions is calculated.Moreover,according to the disturbance experiment of the main steam valve opening and the experimental results,the actual operation history data of the unit is analyzed.The results show that,the heat storage coefficient of steam drum increases with the pressure.The variation trend of heat storage coefficient of water wall decreases at first and then increases with the increase of pressure.With the increase of pressure,the heat storage coefficient of superheater increases,and the total heat storage coefficient of the unit decreases at first and then increases.

关 键 词：汽包锅炉 汽水蓄热 蓄热系数 机理分析 能量平衡 主蒸汽阀 

分 类 号：TK221[动力工程及工程热物理—动力机械及工程]