Modifying method for catalyst activity in power plant SCR (selective catalytic reduction) denitration system

Abstract

The invention discloses a modifying method for catalyst activity in a power plant SCR (selective catalytic reduction) system, which comprises three major steps: firstly, sampling catalyst when in maintenance outage, and carrying out activity detection in a laboratory so as to obtain apparent activity value; secondly, carrying out a SCR denitration system spot performance test when the operation is recovered after the maintenance outage, so as to obtain operation indexes of the denitration system, such as denitration efficiency, ammonia escape rate, oxidation rate of sulfur dioxide, the resistance of the denitration system and the like; and finally, substituting the activity detection value obtained in the laboratory into a performance calculating module of an reactor as a relative proportion of the activity of all layers of catalyst, and utilizing the spot performance test data for regression so as to obtain the real activity of the current catalyst. The modifying method of the invention aims at modifying the error in the laboratory activity detection due to sampling representative problems and over ideal reaction conditions, so as to improve the accuracy of the catalyst activity detection.

Description

technical field [0001] The invention relates to a catalyst activity correction method, in particular to a catalyst activity correction method in a power plant SCR denitrification system. Background technique [0002] Selective Catalytic Reduction referred to as SCR. SCR denitrification technology refers to the reduction agent, such as NH 3 , urea and ammonia water, etc., "selectively" react with NOx in the flue gas and generate non-toxic and pollution-free N 2 and H 2 O to reduce NOx emissions technology. [0003] SCR denitrification technology can effectively reduce nitrogen oxides and meet increasingly stringent environmental protection requirements, and its technology is relatively mature, with a denitrification rate of over 85%, and has been widely used abroad. In China, in order to meet the increasingly stringent NOx emission standards, SCR technology is becoming the mainstream technology for flue gas denitrification in thermal power plants. The catalyst is the mos...

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Problems solved by technology

[0014] (2) Simulation of field conditions

Using the laboratory activity detection method to prepare simulated flue gas with gas cylinders, generally only includes gas phase components, and cannot simulate the impact of fly ash

Moreover, the cross-sectional distribution of flue gas flow rate, ammonia-nitrogen mixing ratio, flue gas components, and temperature is uneven in the field, which seriously affects system performance. However, the size of the reactor in the laboratory small test bench is small, and it is impossible to simulate the uneven cross-sectional distribution. Impact

[0015] In summary, the laboratory can only reflect the relative activity of the catalyst to a certain extent, and there will be a large error with the real activity of the catalyst in the field.

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