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SELECTIVE CATALYTIC REDUCTION
SCR systems use our catalytic design to react ammonia injected into the
air stream with the NOx present. This approach requires an operating
temperature of 320-700º F (160-320º C) depending on the catalyst
used.
For flue gas that is already in this range, the
SCR system will be a
good choice.
Systems use about 1.5wt.
NH3/wt. NOx .
Because there are so many variables, please contact us for specific
information.
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WET SCRUBBING
The lowest initial cost system will be a wet scrubber. However, as
NOx absorbs in water, it reacts to form NO (insoluble form) which will
slowly reoxidize to NO2. In a conventional
scrubber, 60-70% removal occurs. To improve this, several possible
chemicals can be introduced into the towers combined with a very long
contact time.
The disadvantage of this approach is the cost of the special chemicals
required. Additionally, there will be a waste water treatment requirement.
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WET PHASE CATALYST
To avoid the problem of high chemical cost, a special surface catalyst
media was developed to be used at ambient temperatures. This unit uses
conventional scrubber chemistry with a caustic solution, operates at
ambient temperature, and can handle variable loads.
This surface catalyst is relatively expensive initially, so the
best choice will depend on concentration of NOx, temperature, required
efficiency...
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Contact us for more details on any specific project.
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All performance levels are guaranteed.
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Complete engineered systems available.
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All safety standards such as FM, UL... can be
provided.
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Can be combined with our other systems to
handle multiple gas removal.
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