Introduction
The substance that promotes the selective catalytic reduction of nitrogen oxides in the flue gas through catalytic reduction chemical reaction at a certain temperature during the SCR reaction. The most commonly used catalysts are the V2O5-WO3(MoO3)/TiO2 series.
Denitration catalyst classification
Currently, the commercial SCR catalysts are mainly based on TiO2 as the carrier, V2O5 as the main active ingredient, and WO3 and MoO3 as anti-oxidation and anti-toxicity auxiliary ingredients. The catalyst can be divided into three types: plate type, honeycomb type, and corrugated plate type. All three types of catalysts have performance in coal-fired SCR, with plate type and honeycomb type being more common and corrugated plate type being less common. Currently, denitration catalysts for SCR systems in different industries in China are divided into three types according to their operating temperature: low-temperature catalysts (160~280°C), medium-temperature catalysts (280~420°C) and high-temperature catalysts (≥450°C).
Denitration catalyst selectionThe design of the catalyst is to select a catalyst with a certain reaction area to meet the design requirements of SCR basic performance such as denitration efficiency and ammonia escape rate under the conditions of flue gas flow rate, temperature, pressure, and composition at the outlet of the economizer. Under the variable conditions of ash content, its anti-blockage and anti-wear performance is the key to ensure the long-term safe and stable operation of the SCR equipment. From a structural point of view, the plate-type catalyst has the fewest number of wall surface angles and the largest flow area, making it the least prone to ash blockage. The honeycomb-type catalyst has a generally smaller flow area, but each catalyst wall surface angle is a 90° right angle, which is easy to cause catalyst blockage due to ash bridging under harsh flue gas conditions. The corrugated plate-type catalyst has a generally moderate flow cross-sectional area, but its wall surface angle is very small and its quantity is relatively large, making it the most prone to ash accumulation among the three structures.
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