Method for estimating activity of catalyst in denitration device of coal-fired boiler

Abstract

The invention provides a method for estimating activity of a catalyst in a denitration device of a coal-fired boiler. The method is characterized in that in the activity estimation process, the online operation parameters and data of a data collecting system are utilized, the catalyst periodic test data and the denitration process and structure parameters are combined, a chemical reaction model in the denitration process is used for estimating the denitration efficiency, and the activity of the denitration catalyst is estimated according to the denitration efficiency; if the activity of the catalyst is in the activity deactivating area (about 50%), a catalyst replacement plan is considered; for the catalyst replacement plan, the local catalyst activity condition is obtained according to the nitrogen oxide concentration distribution estimation, ammonia spraying accumulation computing, design parameters of a denitration system, and equivalent methods, and a to-be-replaced area is determined. A local replacement plan for the catalyst activity estimation model is favorable for improving the utilization efficiency of the catalyst, the cost is reduced, and the service life of the denitration catalyst of a thermal power plant is prolonged.

Description

technical field [0001] The invention relates to a method for estimating catalyst activity in a denitrification device of a coal-fired boiler, belonging to the field of boiler thermal parameter measurement. Background technique [0002] Denitrification is to reduce NO x main means of emissions. At present, the proportion of flue gas denitrification in my country's thermal power units is not high. Selective catalytic reduction (SCR) is the mainstream process for flue gas denitrification in coal-fired power plants. SCR denitration technology and SCR denitration catalyst originated in Japan in the 1970s and began to be put into commercial use. They were transferred to Europe and the United States in the 1980s, and have been further developed and applied. Now they have become a A mature, reliable, solution to NO x The best technology for emissions. my country started relatively late in the research of SCR denitrification technology. It was only in 2006 that the localization ...

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Problems solved by technology

However, the test device has disadvantages such as large gas consumption, long measurement time, and high test cost.

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