| Citation: | HUANG K,HE S S,LIU H Q.Sequencing optimization and benefit analysis based on quality evaluation of SCR denitration catalyst[J].Journal of Environmental Engineering Technology，2023，13（2）：534-540 doi: 10.12153/j.issn.1674-991X.20220270
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Taking the three-layer catalyst M2-N1-N2 of a coal-fired power plant as an example, the indexes of main chemical composition, specific surface area, trace elements and denitration efficiency were tested, the quality of the existing three-layer catalyst was analyzed and evaluated, and the sequencing of the three-layer catalyst was optimized, to ensure NOx to meet the emission standard. The results showed that, compared with SCR catalyst N1/N2, SCR catalyst M2 had less chemical composition of CaO and Al2O3, which reacted with SO3 gas in the flue gas to generate less amount of CaSO4 and Al2(SO4)3, and it was not easy to deposit in the channel. At the same time, trace elements, such as Na, Mg, Fe and K, in the flue gas and fly ash accumulated less on the surface of catalyst M2 and occupied less effective acid sites. The overall denitration efficiency was tested, and the denitration efficiency of the single-layer SCR catalyst was also explored. The original sequencing three-layer catalyst was optimized to ensure the overall denitration efficiency to meet NOx emission requirements under the new sequencing. The benefit analysis was carried out from the multi-dimensions of environment, economy and resources. The economic cost accounting under different replacement methods showed that SCR catalyst under the new sequencing could save 4.719 million yuan or 3.3 million yuan for the plant. Moreover, it could save the manufacturing resources of the fresh SCR catalyst, and avoid the links of environmental pollution caused by the manufacture and handling of the SCR catalyst. SCR catalyst recycled would also prolong the life span of the catalyst.
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