Treating Variable VOC Loadings with Hot Gas Bypass

THE CHALLENGE

A soil and groundwater remediation firm was experiencing high variability in Volatile Organic Compound (VOC) loading during remediation, and their Regenerative Thermal Oxidizers (RTOs) would shut down due to excessive temperature in the combustion chambers.

THE SOLUTION

Anguil modified both RTOs to incorporate a Hot Gas Bypass, a feature designed to allow incoming process streams to have LEL levels up to 25%.

Anguil retrofitted both RTOs with a new HGBP in the field. This required mechanical, rigging, and electricians onsite who were all managed by Anguil.

THE RESULT

HGBP diverts hot gases from the combustion chamber to the stack during high VOC loading conditions. The residence time of the diverted hot gases as they pass to the stack ensures the emissions are destroyed without affecting the system’s destruction efficiency.

Hot Gas Bypass (HGBP) is commonly ordered on new RTOs with either highly consistent VOC loading or high variability in loading. HGBP is also commonly ordered from Anguil for retrofitting onto Anguil-built RTOs and oxidizers supplied by other manufacturers. 

After completion, the RTOs were able to handle the fluctuation of the customer’s process without any further high temperature shutdowns.