Design And Structure Optimization Of Waste Heat Boiler In Cement Kiln

China has a lot of waste heat,waste heat resource has become the fifth most available resource in C hina.With the national energy conservation and emission reduction,more and more attention has been paid to energy saving technology of waste heat boiler in cement kiln,the application of waste heat boiler in cement industry is more and more widely used in industrial production.In this paper,according to the amount of flue gas produced by a cement plant is 356000m3/h,the flue gas temperature is 400 DEG.According to the principle of thermal calculation of cement kiln waste heat boiler,the EXCEL VBA program was used to calculate the heat transfer surface parameters of a waste heat boiler with a steam 38t/h,a main steam pressure of 2.5MPa and a steam temperature of 350 DEG.Using FLUENT’s porous medium model to replace the complex pipeline structure in waste heat boiler,the distribution of temperature field and velocity field o f the waste heat flue gas entering the waste heat boiler is simulated,the flue gas temperature drop of each heating surface and the flue gas temperature drop calculated by thermodynamic calculation are compared,the reliability of thermodynamic calculation is verified.The velocity distribution of flue gas on each heating surface is obtainde.The discrete phase model and k-ε turbulence model of FLUENT were used to study the variation of erosion rate under different transverse pitch,longitudinal pitch,pipe diameter and wind speed.Results show:the erosion rate increases with the increasing of longitudinal pitch;the erosion tate decreases with increasing transverse pitch;the erosion rate of large diameter is lager than that of small diameter;increasing the flow rate of flue gas will increase the wear of the pipe.