Reverse Gas Baghouse

Reverse gas fabric filter being raised into place Hamon Research-Cottrell has a significant amount of operating experience with large reverse gas type fabric filters on coal-fired boilers beginning in the late 1970s. This experience includes installations greater than 800 MW in size. The combined installations of Hamon Research-Cottrell and GEESI/MET provides Hamon Research-Cottrell with the utility industry's largest installed base for coal-fired boiler reverse gas fabric filters.

The reverse gas fabric filter system remains a conservative design choice for utilities and offers a simple design resulting in extremely long bag life. However, due to the conservative design and low air-to-cloth ratio, reverse gas filters generally require larger footprint area in the plant and are higher capital cost compared to modern pulse jet fabric filters.

Features of Hamon Research-Cottrell's Reverse Gas design include:

Applicable to larger systems up to 4 million acfm
Long bag life – over 10 years and longer demonstrated
Low filter velocity (air-to-cloth ratio)
Low flange-to-flange pressure drop
Use of sonic horns to increase the effectiveness of reverse gas cleaning