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.