变工况下加热器基准值的计算_刘坤.pdfVIP

第31 卷第2 期 电 站 辅 机 Vol. 31 No. 2 2010 年6 月 Power Station Auxiliary Equipment Jun. 2010 : 1672-02 10(2010) 02-0001-03 刘 坤, 张卫彬 ( 中国神华胜利能源分公司, 内蒙古 锡林浩特026015) :根据水和水蒸汽的热力特性, 运用在换热系数 间的计算 中, 得到了温度影响系数的计算方法, 同时利 用变工况时加热器换热面积的变化规律, 定义了加热器换热面积变化系数, 得到了传热系数的计算方法, 两种方法 适用于不同结构的加热器, 同时也降低了计算难度, 简化了加热器端差的计算方法, 对于组合式加热器, 分别对管 侧和壳侧的传热系数的求解方法进行了分析, 得到了传热系数在变工况和设计工况时的比例关系, 使总体传热系 数的求解更加简洁 : 加热器; 传热系数; 变工况; 基准值; 端差; 温度; 变化; 换热面积 : TK264 : A Calculation of the Datum of the HP Heater under Variation of Working Condition LIU Kun, ZH ANG Wei in ( Shengli Energy Su company, Shenhua Corp. , Xilinhaote, Inner Mongolia, 026015, China) Ab tract: The calculation w ay w hich the temperature effects coeff icient will e o tained ased on w ater and st eam thermal characteristics and applying the calculation et ween heat exchanged coefficient. M eanw hile, the calculation way of heat transfer coefficient has een o tained ased on varia le law of heat exchange area of the heater under varia le working conditions and def ining the varia le coefficient of heat exchange area. Both a ove-mentioned ways are applied to different structures of the heater, reduce the calculation process and simplify the calculation way of the temperature difference of the heater. The calculation methods of the heat t ransfer coefficient have een analyzed for oth tu e side and shell side and the proportion etw een the varia le and design w orking conditions has een o t ained. Key word : heater; heat transfer coefficient; varia le w orking condition; datum; temperature coefficient; temperature; variat ion; heat transfer area ,