Aiming at alleviating dust accumulation and low temperature corrosion occurred on rotary air preheaters

most power plants adopt enamel heat storage elements at cold end of the air preheater.The change rules of heat transfer and flow characteristics of the fluid versus the structural parameters of a commonly used heat storage element such as wave height and width were numerically studied

to optimize the enamel storage element design.The results show that

enlarging the waviness height and width can enhance the heat transfer

but the flow resistance will also increase

especially

with an increase in the waviness height and width

the growth rate of the flow resistance coefficient is far higher than that of Nusselt number.When the space in the rotary preheater is enough

it should properly decrease the waviness height and width to obtain a well flow characteristics of the fluid

thus to reduce the energy consumption of the forced and induced draft fan and minimize the operation cost.