Sludge Heating Systems

Tube-In-Tube Heat Exchangers

The spiral and tube-in-tube models are typically located near the boiler. Sludge is pumped from the digester while hot water is pumped from the boiler. Heat is transferred within the tube-in-tube heat exchanger.

Efficient counter flow design
Long-term energy savings
Large sludge passages prevent clogging

Draft Tube Heat Exchangers

Draft Tube Heat Exchangers provide a unique option for use in digesters that incorporate mechanical sludge mixers. Instead of pumping sludge to a remote heat exchanger, hot water is piped to the heat exchanger mounted on the draft tube of an internal or external sludge mixer. Heat is transferred to the sludge as the mixers circulate flow through the hot water jacket region of the draft tube.

Efficient heating and mixing
Simple operation and maintenance
Cost-effective
No sludge pumping required
Heat exchanger is wrapped around the draft tube
Can be used with internal or external mixers

Combination Boiler / Heat Exchangers

WesTech’s experience and design ensure efficient and reliable heating and mixing performance. Our package heating system is dual-fuel capable, using primarily digester gas with a conventional backup fuel source. This allows for efficient use of the valuable biogas produced in anaerobic digestion.