SCR system ammonia injection simulation optimization method, system and device and storage medium

Abstract

The invention discloses an SCR system ammonia injection simulation optimization method, system and device and a storage medium. The method comprises the following steps: obtaining flue gas flow fieldcharacteristics of an SCR system; establishing a CFD model of the SCR system according to the flue gas flow field characteristics, verifying the CFD model, and simulating flow field analysis; and obtaining an ammonia spraying influence factor according to the CFD model, establishing a matrix equation according to the ammonia spraying influence factor, and solving the matrix equation to obtain theoptimized ammonia spraying amount. The definition of the ammonia injection influence factor can quantitatively analyze the influence of ammonia injection of different zones on the ammonia concentration of a catalyst inlet, so that the optimal ammonia injection amount of each zone under different working conditions is obtained, the ammonia-nitrogen mixing uniformity and the outlet NOx concentrationuniformity are improved, and the method can be suitable for different working conditions, is high in calculation efficiency, and can be widely applied to the technical field of SCR denitration.

Description

technical field [0001] The invention relates to the technical field of SCR denitrification, in particular to an ammonia injection simulation optimization method, system, device and storage medium for an SCR system. Background technique [0002] To reduce flue gas NOx emissions from thermal power plants, selective catalytic reduction (SCR) flue gas denitrification systems are widely used in domestic coal-fired power plants. According to the Ministry of Environmental Protection, the National Development and Reform Commission, and the Energy Bureau issued the "Comprehensive Implementation of Ultra-low Emissions and Energy Conservation Transformation Work Plan for Coal-fired Power Plants", it is required that by 2020, all coal-fired power plants that are eligible for transformation in the country will strive to achieve ultra-low emissions. % under the condition, the nitrogen oxide emission concentration is not higher than 50mg / Nm 3 . After the ultra-low emission transformation...

AI Technical Summary

Problems solved by technology

However, at present, most of the simulation optimization strategies for zoned ammonia injection are often based on the qualitative analysis of the distribution of the ammonia nitrogen molar ratio at the catalyst inlet to change the amount of ammonia injection in the zone. It is necessary to obtain the optimal ammonia injection strategy through multiple trials, which takes a long time and cannot be quantitatively analyzed in different zones. Influence range of ammonia injection on catalyst inlet ammonia concentration

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