SCR Denitration Catalyst
Description
In the actual engineering, the catalyst module is long, the width size is substantially fixed, and the height is determined by the designer or catalyst supplier according to the demand efficiency of the SCR system. In addition, during the SCR reaction, since the existence of the catalyst, the portion of the portion SO2 in which the flue gas is oxidized into SO3, and the amount of SO2 substance of SO3 is converted into the amount of SO 3 substance in the gas mixture, referred to as conversion. The SO2 / SO3 conversion is one of the important indicators in the SCR system. The higher the conversion rate of SO2 / SO3, the better the activity of the catalyst, the less the amount of catalyst required. However, the higher the transformation rate of the high dust-arranged denitrifactor SO2 / SO3, the more likely to generate flue, air preheater, or even the risk of sulfate, so the SCR system should strictly control the SO2 / SO3 conversion rate. At present, the SCR system catalyst required by China requires no more than 1% to SO3, and all SCR system catalysts make the SO2 of the flue gas to SO3 and the volume of the catalyst to reduce the volume of the catalyst. Reduce the formation of SO3.
Therefore, the design of the catalyst is to select a catalyst having a certain reaction area to meet the design requirements of SCR basic performance such as denitration efficiency, ammonia escape rate, and other SCR basic properties such as flue gas flow, temperature, pressure, and ingredients such as flue gas exit. In an environment where the ash conditions are changed, their anti-blocked and anti-wear properties are the key to ensuring long-term security and stable operation of SCR equipment.
At the level of anti-blur, for a certain reactor cross section, under the same catalyst pitch, the convection flow area of the plate-type catalyst is the largest, generally above 85%, and the number thereof is the least, the most is not easily bluff. The cellular catalyst is less than about 80%, and each of the catalyst wall corners is 90 ° right angles, and under harsh flue gas conditions, it is easy to generate an ash bridge to cause a catalyst to block the clogging, but Under the same design conditions, the honeycomb catalyst of the large pitch is appropriately selected, and the anti-blocking effect can be proximate the plate catalyst; the flow area of the corrugated plate-type catalyst is similar to the honeycomb catalyst, but due to the small corner angle and the quantity is relatively Many, very easy to shame in three structures, but its anti-poisoning properties and antioxide oxidation can be very strong.
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