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A
properly designed wet scrubber is a highly efficient approach to controlling
kiln emissions which contain HCl, HF and SO2 acid gases, metals, and particulate
matter. A two-stage counter-flow or cross-flow design wet scrubber has
the advantages of a small footprint and low maintenance requirements due
to the washing action of the spray nozzles on the scrubber internals.
Often the initial capital investment for a wet scrubber is less than a
dry injection fabric filter. Most important, a wet scrubber will operate
with a low pressure drop, keeping fan horsepower requirements low. Reagent
costs are low as well. This results in low operating costs and significant
savings for brick kiln facilities.
• Lower capital and operating costs than dry lime injection fabric
filters or dry lime scrubbers
• High efficiency for acid gas and particulate removal
• Low solid waste removal requirements
• Design flexibility for meeting future EPA regulations for SO2
emissions.
To ensure optimum performance with minimal downtime, the following must
be considered in design of the wet scrubber:
• Sewer permitting limitations for wastewater disposal
• Preserving kiln draft conditions for maintaining product uniformity
• Minimizing maintenance requirements
• Providing a safe environment for handling reagents in the scrubbing
liquor
An optimally designed wet scrubber will have the following:
• Quencher to pre-cool the gas stream
• Soda ash or caustic used as the scrubbing liquor
• Reflux damper or variable frequency drive on the fan motor for
precise kiln draft control
• Chevron style mist eliminator to achieve greater than 99.9% drop
removal efficiency
• Integrated wastewater evaporator for sludge disposal
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