What is rotary sludge drying system and how does it work?

  The rotary sludge drying system is specifically designed for sludge with high moisture content, high viscosity, and low calorific value, it is usually used in sludge treatment in municipal, dyeing, and papermaking industries. After dewatering by a filter press, sludge with 80-90% moisture can be reduced to 55-60%, then rotary sludge dryer will further reduces its moisture content to below 20%. The dried sludge can be used for agricultural purposes, as fuel, for incineration or landfill.

  Structure

  The rotary sludge dryer mainly consists of a rotary drum, a hot air furnace, a breaking up equipment, and a dust removal system. The selection of heat source is flexible, such as biomass, steam, natural gas, coal, hot oil, waste gas, you can choose the most economical heat source according to your actual condition. The breaking up equipment is used to prevent sludge material from adhesion and enhance drying efficiency.

  Working principle

  The wet sludge is fed into the rotary drum through the feeding device and comes into contact with high-temperature hot air generated by the thermal furnace, rapidly evaporating moisture. The wet sludge is lifted by the lifting plates, forming a curtain-like material layer, which increases the heat exchange area and improves drying efficiency. When the material falls, it tends to adhere to the drum wall. The dispersing device promptly removes the adhered material from the inner wall, preventing sticking. After sufficient heat exchange, the sludge reaches the required moisture content and slides to the discharge outlet, completing the entire drying process.

  If you have any questions about rotary sludge dryer, please feel free to contact us.