Furnace flue gas denitrification and ammonia injection intelligent system and its control method

Abstract

The invention provides an intra-furnace flue gas denitration ammonia spraying intelligent system and a control method thereof. The system includes: N spraying heads which are arranged on a spraying plane; a NOX concentration detection assembly which includes M regional sampling detection units which detect flue at M regional sampling positions on a detection plane and acquire a NOX concentration at each regional sampling position; the spraying plane and the detection plane are arranged in one section of a straight chimney flue and are disposed perpendicular to the direction in which the straight chimney flue extends, and the M regional sampling positions do not overlap on the detection plane, and N is equal to or greater than 2, and M is equal to or greater than 2. According to the invention, the spraying plane and the detection plane are defined to be in a perpendicular direction to the direction in which the chimney flue extends, and N spraying heads are arranged on the spraying plane, and M regional sampling positions are arranged on the detection plane, so that a novel intra-furnace flue gas denitration ammonia spraying intelligent system that is different from conventional flue gas denitration ammonia spraying systems is provided.

Description

technical field [0001] The invention relates to the technical field of atmospheric environmental protection, in particular to an intelligent system for flue gas denitrification and ammonia injection in a furnace and a control method thereof. Background technique [0002] Coal-fired devices, especially coal-fired devices in thermal power plants, exhaust smoke will cause air pollution, one of the main pollutants is nitrogen oxides (NO X ). Nitrogen oxides (NO X ) into the atmosphere will form acid rain, which has a great impact on the environment. Flue gas denitrification is to remove nitrogen oxides (NO X ). [0003] Nitrogen oxides (NO X ) treatment methods are: Selective Catalytic Reduction (SCR) and Selective Non-Catalytic Reduction (SNCR). Among them, SCR uses reducing agent (ammonia, urea) under the action of metal catalyst to selectively react with NO X N 2 and H 2 O. The denitrification principle of SNCR is to spray ammonia water directly at the furnace outle...

AI Technical Summary

Problems solved by technology

[0004] With the increasingly stringent emission standards for flue gas environmental protection, in order to ensure that the emission standards are met, the usual practice is to inject excessive ammonia water into the flue, which not only increases the cost of desulfurization, but also brings unreacted ammonia water to the equipment. The new problem of corrosion

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