SNCR (Selective Non-Catalytic Reduction) nozzle device used for pi-type corner tangential boiler

Abstract

The invention discloses an SNCR (Selective Non-Catalytic Reduction) nozzle device used for a pi-type corner tangential boiler, and is arranged in the boiler for ejecting a denitration reductant into a hearth. The SNCR nozzle device comprises a plurality of nozzles (3), wherein the nozzles (3) are respectively crosswise arranged in the hearth by layers, and are communicated with a main pipe fixed on a boiler wall through spray pipes (1) to receive the denitration reductant; the length, which extends into the hearth, of each spray pipe (1) can be regulated for regulating the height of each nozzle (3) to evenly mix oxynitride and ammonia gas in smoke. A nozzle arrangement way is set, and the height of each nozzle is automatically regulated, so that NOX and ammonia gas in the smoke are in full contact and are evenly mixed, and denitration efficiency is improved.

Description

technical field [0001] The invention relates to a denitrification device, in particular to an SNCR nozzle device for a π-shaped four-corner tangential circle boiler. Background technique [0002] At present, selective non-catalytic reduction (SNCR) has become a commonly used technology for flue gas desulfurization in power plants. The reaction produces nitrogen and water which are harmless. The reducing agent is sprayed into the area where the temperature of the furnace is 850°C to 1100°C, and it is rapidly thermally decomposed into NH 3 , and NO in flue gas X N 2 and water. [0003] At present, SNCR technology has the advantages of small footprint, suitable for the transformation of old units, low investment, and low operating costs. However, due to the fast flow rate of the flue gas and high dust content, only a small part of the reducing agent can be mixed with the flue gas. The reaction of nitrogen oxides in the system will lead to low denitrification efficiency, un...

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Problems solved by technology

[0003] At present, SNCR technology has the advantages of small footprint, suitable for the transformation of old units, low investment, and low operating costs. However, due to the fast flow rate of the flue gas and high dust content, only a small part of the reducing agent can be mixed with the flue gas. Nitrogen oxides react, resulting in low denitrification efficiency, uneven nitrogen concentration at the outlet, high ammonia escape rate, and corrosion of the water wall.

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