中文摘要：

汽包锅炉蓄热系数是衡量机组蓄能的主要参数，正确估计其大小和变化规律对机组运行控制有着十分重要的作用．依据水和水蒸汽的热力性质，计算出不同压力下过冷水、饱和水、蒸汽及金属的基本蓄热能力，结合设计数据计算出锅炉蓄热系数及各种介质蓄热在其中所占比例．结果表明：饱和水、蒸汽及金属的蓄热能力随压力变化，使锅炉蓄热系数呈现出随压力增加而减小的趋势．对1台300MW机组汽轮机高压调门的扰动实验数据进行开环辨识，利用风量和氧量构造出热量信号；并对1台600MW机组的长期运行数据进行闭环辨识，结果均证实了这一规律．

英文摘要：

The heat storage coefficient is a main parameter to indicate the heat storage capacity of the unit. Evaluating the value and the variation law of the heat storage coefficient accurately is of great importance for units operation control. Usually the heat storage coefficient is considered as a constant, but in this paper it is considered as a variable. First, the basic heat storage capacity of subcooled water, saturation water, steam and metal on different pressure are calculated according to the thermodynamic properties of water and water vapour. And then the boiler heat storage coefficient and in which the proportion taken by every medium heat storage are calculated based on the units design data. It is shown that the heat storage capacity of saturation water, steam and metal, of which the boiler heat storage capacity is composed, is changed with pressure. And the boiler heat storage coefficient decreased as the pressure increased. The test data for turbine high-pressure regulation valve disturbance at different pressure in a 300 MW unit are identified on open loop method. Another experiment using the long time running data of a 600 MW unit is made for close loop identification, in which the heat release signal are derived from airflow and oxygen content measured. Both two results are in good agreement with the law.