Selection and design of SCR catalyst for a high-temperature dedusting and denitration integrated device

Abstract

Abstract: A demonstration project of a high-temperature dedusting and denitration integrated device for a 350 MW coal-fired power generation unit was taken as the research object，and the device's high-temperature low-dust layout was compared with the regular high-temperature high-dust layout. The impact of the two layouts on the selection and design of SCR catalyst was analyzed from technical and economic aspects.Through the lateral comparison and analysis on related data， it is concluded that integrated arrangement can alleviate the risk of wear， ash blockage and chemical poisoning of the catalyst. Selecting small aperture honeycomb-shaped catalyst with 35 holes can reduce the total volume of the catalyst. The chemical life of SCR catalyst can be extended from 3 years （24 000 h） under conventional high-temperature high-dust arrangement to five to six years in a relatively clean environment. At the same time， this integrated arrangement contributes to reducing the investment and operation cost of the device. Studying the integrated arrangement is of great significance for the scientific design of SCR denitration device and its technology development.

Key words: high-temperature dedusting and denitration, integrated device, catalyst, selection and design, lifetime analysis, ash blockage

WANG Wei, WANG Lele, KONG Fanhai, CHEN Mu, YAO Yan, LEI Siyuan. Selection and design of SCR catalyst for a high-temperature dedusting and denitration integrated device[J]. Huadian Technology, 2020, 42(9): 26-31.

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Selection and design of SCR catalyst for a high-temperature dedusting and denitration integrated device

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