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Low temperature SCR for NOx reduction
Selective Catalytic Reduction (SCR) is the process of NOx reduction that takes place when a NOx source is mixed with ammonia and allowed to react at the surface of the proper catalyst. The liquid ammonia quickly turns into gas, mixes with the NOx gas and the mixture then reacts at the catalyst. The result is the conversion of the mixture to nitrogen gas N2 and water vapor H2O, both harmless atmosphere constituents. The process uses aqueous ammonia, but there is no wet residue or by-product collected: all the reactants leave the system as gases.
Tri-Mer offers three NOx reduction approaches:
Catalysts are chemically formulated to allow this reaction to occur at different temperature ranges. The most commonly used catalysts require temperatures of 600oF to 1100oF to achieve high levels of effectiveness while consuming reasonable quantities of catalyst material. Tri-Mer offers SCR units in this temperature range. Yet many applications that require NOx reduction do not have gas stream temperatures high enough to make these conventional catalysts effective.
Low Temperature NOx Catalyst
The low temperature catalyst is the same catalyst used in the unique UltraCat catalyst filters. (See: Ceramic Filters / Hot Gas Filtration) with one important difference: the catalyst in the filters is micronized powder, distributed throughout the walls of the filters. In the low-temp SCR units, the catalyst is in block form.
When would low-temp SCR be utilized?
Ceramic filters capture particulate on the outer surface, with negligible penetration to the interior of the filter media. In contrast, stand-alone low-temp SCR units must be downstream of some form of effective PM removal. There must be a high-functioning multi-field ESP, a fabric filter baghouse (less feasible as temperatures approach 400oF), or the standard UltraTemp filter, which is effective to 1650oF. (See: Ceramic Filters / Hot Gas Filtration) In rare instances, such as natural gas combustion, PM is inherently low.
Tri-Mer Corporation offers more NOx reduction technologies than any company, worldwide. For more information, please contact: Kevin Moss, (801) 294-5422, email@example.com
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