GMD Environmental Technology, Inc.'s Flue Gas Coolers are specifically designed to reduce and control the temperature of particulate laden flue gases entering the fabric filter. In the past, certain processes were either unable to use fabric filters because of high gas temperatures or could use a fabric filter only if dilution air was added to the off-gas stream to cool the air (increases exhaust volume by as much as three times) or by using expensive high temperature materials in the manufacture of the bags.

The GMD Flue Gas Cooler is a simple cross-flow air-to-air tube type heat exchanger. Hot gas flows vertically inside tubes while ambient air is forced horizontally across the tubes by the use of tube axial cooling fans. The outlet (cooled) gas temperature is regulated by a controller (adjustable) that responds to a thermo-couple located in the flue gas stream normally located in the duct just ahead of emission control system. The "cooling" fans are staged "on" as the flue gas temperature rises and conversely "off" as temperature falls.

Tube cleanliness (fouling) is monitored through the use of a pressure differential indicator. If the tubes encounter fouling over a period of time, a cumulative pressure drop is observed and corrective measures taken.

GMD FLUE GAS COOLERS REDUCE SYSTEM SIZE, RELATED EQUIPMENT COST AND OPERATING (ENERGY AND MAINTENANCE) EXPENSES

GMD's Flue Gas Coolers provide…

• Positive Control of Off - Gas Temperature to Baghouse
• Constant Gas Volume at Baghouse
• Smaller Baghouse requirements
• Smaller I.D. Fan requirements
• Less Horsepower, i.e. Lower energy consumption.
• Lower cost Filter Bags.
• Primary particulate separation at cooler hopper.
• Minimizes corrosion problems by maintaining
gas temperature above dew points.
• Eliminates or minimizes bag blinding due to
maladjusted quench systems (water spray cooling).
• Eliminates need for 100% dilution air cooling
and the resulting high energy requirements
• Minimizes fire hazard (burning bags).
• Waste heat recovery for use in many
applications when properly designed.

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