Selective catalytic reduction denitration device and ammonia spray optimizing method thereof

Abstract

The invention belongs to the technical field of coal-fired boiler atmosphere pollution control, and especially relates to a selective catalytic reduction denitration device and an ammonia spray optimizing method thereof. The method comprises the following steps: simulating the flue gas flowing process of the denitration device to obtain the flue gas flowing and component transporting characteristics in the denitration device, and analyzing the non-uniformity of ammonia nitrogen distribution of a cross section above a catalyst based on the component transporting characteristics of ammonia nitrogen in the denitration device; and calculating the optimum ammonia spraying amount of very ammonia nozzle through a negative feedback iterative technology based on the analysis result of the non-uniformity of the cross-section ammonia nitrogen distribution according to the concentration distribution of the ammonia nitrogen, the partition conditions of an ammonia spray grid and the speed of every ammonia nozzle. The negative feedback iterative technology-based ammonia spray optimization adjusting method rapidly and highly-efficiently improve the non-uniform phenomenon of the ammonia nitrogen distribution of the cross section above the catalyst, increases the denitration efficiency of the denitration device, and reduces the ammonia escaping rate of the denitration device.

Description

Technical field [0001] The invention belongs to the technical field of air pollution control of coal-fired boilers, and in particular relates to a selective catalytic reduction denitrification device and an ammonia injection optimization method thereof. Background technique [0002] Nitrogen oxides are recognized as one of the major atmospheric pollutants around the world. The amount of nitrogen oxides emitted by fixed sources such as thermal power plants, metallurgical plants, and chemical plants accounts for more than 90% of man-made emissions. Large amounts of nitrogen oxides are emitted. It poses a huge threat to the entire ecosystem and human life and health. Selective catalytic reduction denitrification technology is currently the most effective and widely used technology for removing nitrogen oxides from flue gas. The use of numerical simulation to simulate the actual flue gas flow and ammonia injection process of the selective catalytic reduction denitrification dev...

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Problems solved by technology

[0004] In order to solve the above-mentioned technical problems, the object of the present invention is to provide a selective catalytic reduction denitrification device and its ammonia injection optimization method, which are used to solve the problems of high adjustment blindness, low work efficiency, and poor optimization effect in previous ammonia injection optimization adjustment tests. Problem, through differential ammonia injection adjustments for different sub-regions, quickly and efficiently improve the cross-sectional ammonia concentration distribution above the catalyst

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