Flow field optimization system for denitration and ammonia injection device in coal-fired power plant

Abstract

The invention discloses a flow field optimization system for a denitration and ammonia injection device in a coal-fired power plant. The flow field optimization system comprises a boiler tail flue andan economizer outlet guide plate, wherein the economizer outlet guide plate comprises a plurality of economizer outlet guide plate units; the economizer outlet guide plate units are arranged at intervals in the boiler tail flue. According to the arrangement of the economizer outlet guide plate and the flue reducing guide plate, the flue gas can be subjected to effective flow field optimization inside the boiler tail flue, so that the flue gas circulation stability is improved, and the flue gas turbulence problem in the traditional technology is solved. Because the flue gas flow field is stable, the mean velocity of flue gas entering the reactor is relatively consistent, and the relative standard deviation of speed distribution is small. The ammonia injection grid comprises a plurality ofammonia injection grid units, and each ammonia injection grid unit is independently controlled for ammonia injection, so that the average value of the molar ratio of NH3 to NOx can be improved. Because the ammonia injection accuracy is improved, the problem in the traditional technology that the reducing agent is wasted can be solved, and the problem of ammonia pollution can be avoided.

Description

technical field [0001] The invention belongs to the technical field of SCR denitrification in a coal-fired power plant, and more specifically relates to a flow field optimization system for a denitrification ammonia injection device in a coal-fired power plant. Background technique [0002] In recent years, with the rapid economic development, the consumption of electricity has also increased greatly, followed by the continuous increase of coal consumption. Thermal power plants need to consume a large amount of coal in the process of generating electricity, and after the coal is burned, a large amount of nitrogen oxides will be produced. Nitrogen oxides are the main cause of nitric acid rain. At the same concentration, the corrosion intensity of nitric acid rain is twice that of sulfuric acid rain. Therefore, reducing nitrogen oxide emissions from coal-fired power plants is of great significance to environmental protection. [0003] my country's environmental policy require...

AI Technical Summary

Problems solved by technology

Excessive ammonia injection will increase the cost of ammonia injection in the power plant, and excessive ammonia injection will also cause new pollution

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