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Flue gas denitrification
Currently, the catalysts commonly used for SCR denitrification are mainly titanium oxide-based catalysts with TiO2, V2O5, WO3 and MoO3 as the main components, mainly in honeycomb, flat plate and corrugated plate types.
The honeycomb type catalyst is homogeneous and extruded at one time, with high specific surface area; the flat catalyst is made of stainless steel grid and impregnated with active material, with high resistance to fly ash abrasion and low pressure loss, and high resistance to arsenic poisoning; the corrugated plate catalyst is made of reinforced glass fiber and impregnated with active material, with low mass, high activity and high resistance to CaO poisoning.
SNCR or Selective Non-Catalytic Reduction
Selective non-catalytic reduction is a method to reduce NOx without using a catalyst in the temperature range of 850 to 1100°C. The most commonly used drugs are ammonia and urea.
In general, SNCR denitrification efficiency can reach 25% to 40% for large coal-fired units and up to 80% for small units. Because the method is greatly affected by the size of the boiler structure, it is mostly used as a supplementary treatment means of low-NOx combustion technology. Its low engineering cost, simple arrangement, small footprint, suitable for old plant transformation, new plants can be used in accordance with the boiler design.
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