Measuring method of kinetic parameter change rules of after-service SCR (selective catalytic reduction) denitrification system catalyst

Abstract

The invention relates to a measuring method of kinetic parameter change rules of an after-service SCR (selective catalytic reduction) denitrification system catalyst, which comprises the following steps: establishing an SCR catalyst activity detection experiment table, cutting off a test sample block from the whole in-service catalyst block in site, putting the test sample block in a reactor, and setting experimental parameters for all experiments, including reactor internal temperature, experiment gas introduction amount and ammonia-nitrogen ratio; and simulating the chemical reaction process of the in-service SCR denitrification system catalyst, establishing a chemical reaction model of the catalyst in the reactor, calculating the kinetic parameters of the catalyst, and fitting to obtain a kinetic parameter change rule curve chart for predicting the kinetic parameter change rules of the catalyst. The technique provided by the invention can provide technical support for establishment of a power plant SCR denitrification system operation regulation scheme.

Description

technical field [0001] The invention relates to the technical field of electric power engineering, in particular to a method for measuring the change law of dynamic parameters of a catalyst in an SCR denitrification system after service. Background technique [0002] Selective catalytic reduction denitrification technology, mainly based on TiO 2 V for the carrier 2 o 5 based industrial catalysts, including V 2 o 5 / TiO 2 , V 2 o 5 / TiO 2 -SiO 2 , V 2 o 5 -WO3 / TiO 2 and V 2 o 5 -MoO 3 / TiO 2 , its operating temperature is between 280-420°C, and its denitrification efficiency can reach more than 85%, which can effectively reduce nitrogen oxide emissions and meet increasingly stringent environmental protection requirements, and has been widely used in thermal power generation. In recent years, the research and development of low-temperature SCR denitration catalysts has progressed rapidly, forming a catalyst with activated carbon as the carrier and V 2 o 5 , F...

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Problems solved by technology

[0003] Catalyst is the core of power plant SCR flue gas denitrification system, which accounts for about 1 / 3 of its investment. The selection of catalyst structure and composition is crucial to the safe and economical operation of the power plant. The cost of regular replacement accounts for the main part of the operating cost. After installing the SCR denitrification system, it will also affect the structural design and safe and economical operation of the boiler system.

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