Wearing and clogging diagnosing method of SCR denitration catalyst

Abstract

The invention relates to a wearing and clogging diagnosing method of an SCR denitration catalyst. The method comprises: graphical representation and marking are carried out on wearing and clogging situations of a catalyst inside a reactor and a visual cloud chart is drawn; sampling is carried out on the catalyst inside the reactor and mechanical property detection and analysis are carried out on the catalyst to obtain detection and analysis data of the catalyst; field detection of denitrification equipment is carried out to obtain data of an actual flow field operation situation of the denitrification equipment; on the basis of CFD numerical value simulation and physical model testing, a model consistent with the catalyst structure and the internal structure of the reactor is established; and with the visual cloud chart, the data and the model, causes of wearing and clogging of the catalyst are obtained. With the diagnosing method provided by the invention, a catalyst operation problem of a power plant is solved; the operation economy and equipment safety of the denitrification equipment are improved; exploration of diagnosing the wearing and clogging problems of the SCR catalyst is carried out; and thus the service life of the catalyst is prolonged and the risk of the operation accident of the denitrification equipment is reduced.

Description

technical field [0001] The invention relates to the field of SCR denitration, in particular to a method for diagnosing wear and ash plugging of an SCR denitration catalyst. Background technique [0002] In order to meet the national environmental protection emission standards, during the "Twelfth Five-Year Plan" period, almost all domestic coal-fired power plants have installed and operated Selective Catalytic Reduction (Selective Catalytic Reduction) flue gas denitrification equipment. With the full implementation of the "ultra-low emission" policy, the problems in the SCR denitrification process have become increasingly prominent. As the core of the SCR process, the catalyst is very important in the denitrification operation. At present, it is found that during the operation of many power plants, the catalysts have different degrees of wear and ash plugging, resulting in increased ammonia escape and increased resistance of downstream cold-end equipment, which seriously aff...

AI Technical Summary

Problems solved by technology

[0012] The wear of the catalyst destroys its physical structure. After the catalyst is eroded, the total amount of active substances decreases, resulting in a decrease in denitrification performance and a shortened service life.

When the catalyst is severely eroded, it will collapse and perforate, causing a short circuit of the flue gas, and part of the flue gas will directly enter the next layer of catalyst or the outlet of the SCR reactor without flowing through the catalyst pores, resulting in excessively high local ammonia escape concentration and affecting NO x Emission up to the standard will increase the risk of ammonium bisulfate blockage in the air preheater, and once a certain area in the SCR reactor collapses and causes a short circuit of the flue gas, it will cause an increase in the flow velocity in a local area and aggravate the wear of the surrounding units

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