During the time of the thermal calculation in coal-pulverizing system for boilers in actual power plants by using 《Technical code for design and calculation of coal-pulvering system in coal-fired power plants》

there is doubt upon whether the physical heat of raw coal has to be calculated or not.Through analysis and comparison of calculated results for coal-pulverizing systems in four different power plants

for four differen coal sorts

for six types of coal pulverizers

and using three calculation methods

it is found that the physical heat of raw coal is a kind of dominant heat in physics.Under condition of certain coal sort and coal-pulverizing system

it is a single value function of the raw coal temperature

it's existence is objective

and then it can't be negligible in calculation.