High pressure fine water mist spray gun for SNCR (selective non-catalytic reduction) denitration system

Abstract

The invention relates to a high pressure fine water mist spray gun for an SNCR (selective non-catalytic reduction) denitration system, which effectively solves the problems of easy abrasion and corrosion, large atomizing particle and poor use effect of the existing SNCR denitration spray gun. The high pressure fine water mist spray gun adopts the technical scheme that an inner gun pipe is arranged in the center of the interior of an outer gun pipe in a penetrating way, one end of the inner gun pipe extends out of the outer gun pipe, the extending end is connected with a reducing agent inlet, the other end is communicated with an inlet of an atomizing spray nozzle at the end part of the outer gun pipe, a cavity between the outer wall of the pipe body of the inner gun pipe and the inner wall of the pipe body of the outer gun pipe forms a compressed air passage for protecting the inner gun pipe, one end, with the atomizing spray nozzle, of the outer gun pipe is provided with a compressed air outlet which is communicated with the compressed air passage, and the side wall of the outer gun pipe is provided with a compressed air inlet. The high pressure fine water mist spray gun has the advantages that the particle size of the atomizing particle is 1-100mum, the inner gun pipe is protected by the heat isolation function of the compressed air, the spray gun can maintain the high strength, corrosion-resistant property and high anti-abrasive property at high temperature, the continuous balance of an ammonia spraying area is guaranteed, the convenience in use is realized, and the effect is good.

Description

technical field [0001] The invention relates to a spray gun, in particular to a high-pressure fine water mist spray gun used in an SNCR denitrification system. Background technique [0002] The SNCR denitrification technology is to inject reducing agents such as ammonia water and urea into the boiler furnace through a spray gun to selectively react with NOx, without using a catalyst, so the reducing agent must be added in the high temperature area. The reducing agent is sprayed into the area where the temperature of the furnace is 850-1100°C, and it is rapidly thermally decomposed into NH3, which reacts with NOx in the flue gas to form N2 and water. Since the working temperature of the SNCR denitrification spray gun is relatively high (the flue gas temperature is 850°C-1100°C ), and the flue gas flow rate is also fast, and a large amount of dust is entrained in the flue gas. Due to the structural problems of the traditional SNCR denitrification spray gun, the compressed air ...

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Problems solved by technology

[0003] In view of the above situation, in order to overcome the defects of the prior art, the object of the present invention is to provide a high-pressure fine water mist spray gun for the SNCR denitrification system, which can effectively solve the problem that the SNCR denitrification spray gun is easy to wear and corrode, and the atomized particles are large. Problems with unsatisfactory results

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