Research on the simulation of the thermal drying process of municipal sludge based on orthogonal experiment method
WU Guanglong
Abstract：A simulation calculation is conducted for the thermal drying process of municipal sludge in a certain area.The orthogonal experiment method is used to study the influence of the moisture content and temperature of municipal sludge,as well as the air temperature and flow rate on the energy consumption of sludge thermal drying.The results show that the steam consumption per unit for sludge thermal drying gradually decreases with the increase of sludge moisture content.The influence laws of air temperature and sludge temperature on steam consumption per unit are similar.The steam consumption per unit for sludge thermal drying decreased linearly with the increase of two factors.The increase of air flow will cause the steam consumption per unit to increase linearly.The higher the moisture content of sludge is,the weaker the influence of sludge temperature,air temperature and air flow rate on the steam consumption per unit of sludge thermal drying shows.The ranking of influencing factors on steam consumption per unit is as follows:moisture content of sludge>air temperature>sludge temperature>air flow rate;The ranking of factors influencing thermal efficiency is as follows:moisture content of sludge>air temperature>air flow rate>sludge temperature.Within the scope of the experimental study,the optimal process parameters are as follows:the moisture content of sludge is 80%,the temperature of wet sludge is 60℃,the air temperature is 60℃,the air flow rate is 4 000 m3/h.At this time,the steam consumption per unit is 1.097 t/t H2O,and the thermal efficiency is 79.85%.
Keywords：municipal sludgedryingenergy consumptionorthogonal experiment
Publication Date：2025-04-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 56-60 )