Waste Heat Recovery

Reclamation of heat from flue gas for other uses

Due to the immense amount of heat generated by thermal oxidizers, many Zeeco systems incorporate waste heat recovery equipment to further reduce operating costs by generating steam and/or heating oil that is used for other plant operations.

Indirect Fired (extractive)

An alternative to the direct-fired approach is the indirect (also known as "extractive") system. Extractive systems offer exceptional flexibility, especially when other sources of thermal oil heating sources are limited. The additional control provided by the induced draft fan allows for very precise regulation of the oil outlet temperature, even when faced with fluctuating waste flow rates.

Extractive systems are popular in gas plants utilizing membrane technology. Due to the relatively high hydrocarbon content in the permeate gas from the membrane system, the available heat duty from the flue gas is often much greater than that which is needed to be returned to the plant. A thermal oil heat exchanger placed directly in the flue gas path would generate more duty than could be effectively returned to the plant, since the oil circulation rate required to prevent degradation of the oil places constraints on the coil design.

Indirect-Fired (extractive) Waste Heat Recovery by Zeeco


Zeeco can provide combustion and emissions control solutions wherever hydrocarbon processing takes place. Customers can find our equipment and services in upstream, midstream, and downstream oil and energy processes.

We also offer products and support for other industries and applications such as tank/terminal loading and storage, pharmaceutical, carbon black, pulp & paper, steel, food processing, and more.