What is the change in SO3 at the inlet and outlet of the SCR denitration reactor?
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Who can clearly explain the changes in SO3 at the inlet and outlet of the SCR denitration reactor? What factors are related to the SO3 oxidation rate?
In the process of system design and catalyst selection, it is preferable to keep the SO2/SO3 conversion rate as low as possible. The conversion of SO2/SO3 occurs both during boiler combustion and in denitration processes. During the boiler combustion process, approximately 1-1.5% of SO2 is converted into SO3. Generally speaking, the higher the smoke temperature, the higher the conversion rate. There is also a certain relationship between the conversion rate and the flue gas flow rate; generally, the higher the flow rate, the lower the conversion rate. The content of V2O5 in the catalyst has a significant impact on the SO2/SO3 conversion rate. For high-sulfur coals, it is necessary to reduce the V2O5 content; this in turn lowers the overall activity of the catalyst and leads to an increase in its volume. Therefore, the control of the SO2/SO3 conversion rate mainly lies in the selection of the catalyst. In general, when designing SCR denitration systems, the SO2/SO3 conversion rate is kept below 1%.