Method for predicting life of SCR denitration catalyst in power plant

Abstract

The invention relates to a method for predicting the life of an SCR denitration catalyst in a power plant. The method comprises the following steps: step 1, on the basis of analyzing the three most important factors in deactivation of the SCR denitration catalyst, establishing a deactivation model of the SCR denitration catalyst, wherein the three factors include chemical poisoning, porous channelblockage and fly ash abrasion; step 2, calculating an activity value and an activity decreasing trend in an operation process of the SCR denitration catalyst; step 3, according to acquired activity data, combining the deactivation model to obtain a relational expression between the catalyst activity and the operation time through a previous actual data regression fitting deactivation model; and step 4, acquiring the activity value of the catalyst in the future according to the expression, and comparing the activity value with preset activity values that cannot meet denitration tasks to judgethe remaining available time of the catalyst. According to the method disclosed by the invention, the activity values of the SCR denitration catalyst at different times can be accurately predicted byusing operation data acquired on site in combination with the deactivation model, and the life of the catalyst can be judged.

Description

technical field [0001] The invention relates to an SCR denitrification system of a power plant, in particular to a method for predicting and calculating the activity and service life of an SCR denitrification catalyst. Background technique [0002] Selective Catalytic Reduction (SCR) flue gas denitrification technology, as a mature denitrification technology, has been widely used by domestic and foreign power plants. As the core of the SCR system, the catalyst plays a vital role in the efficiency, stability and safety of the entire denitrification system. The service life of the catalyst is generally 3 to 5 years, which is mainly related to the coal quality composition and operating conditions. As the operating time of the SCR system increases, the denitrification efficiency will gradually decrease, and the amount of ammonia escape will increase, eventually failing to meet the emission standards. This is caused by the deactivation of the catalyst during operation, and a ne...

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Problems solved by technology

[0004] At present, an exponential deactivation equation is often used to solve the problem of catalyst deactivation rate, but this equation is only a simple mathematical expression obtained based on engineering experience, which cannot reflect the nature of physical and chemical changes that cause catalyst deactivation, and lacks certain scientific and nature. accuracy

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