In terms of preventing ash blocking, for a certain reactor cross section, at the same catalyst pitch, the flow area of the plate catalyst is the largest, which is generally above 85%, followed by the honeycomb catalyst, and the flow area is generally about 80%. The flow area of the plate catalyst is similar to that of the honeycomb catalyst.
Under the same design conditions, a large-pitch honeycomb catalyst is appropriately selected, and its blocking prevention effect can approach that of a plate catalyst.
From the perspective of the structure of the three catalysts, the number of included angles on the wall of the plate is the smallest, and the flow area is the largest, which is the least likely to block ash;
The honeycomb type catalyst has a general flow area, but the angle between each catalyst wall is a right angle of 90 °. In harsh flue gas conditions, ash bridging is likely to cause catalyst blockage;
Corrugated plate type catalyst has a general cross-sectional area, but its wall angle is small and its quantity is relatively large. It is the easiest type of ash deposit among the three structures, but it has the best anti-poisoning performance and resistance to sulfur dioxide oxidation.
Plate type, honeycomb type and corrugated plate type catalysts all have achievements in coal-fired SCR. Among them, there are more plate type and honeycomb type, and less corrugated plate type.
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