Water-cooled air atomizing spray gun suitable for denitration adopting SNCR method

Abstract

The invention discloses a water-cooled air atomizing spray gun suitable for denitration adopting an SNCR (Selective Non-Catalytic Reduction) method. A cooling water inlet is formed on an inner sleeve, and a cooling water outlet is formed on an outer sleeve, so as to form inlet and outlet passages for cooling water; a water solution pipe and an air pipe are arranged inside the inner sleeve; connectors are arranged at one end of the water solution pipe and one end of the air pipe 7, and a spray nozzle and an air cap are arranged at the other end of the air pipe 7; recirculated cooling water enters the inner sleeve through the cooling water inlet, enters a front section of the spray gun along with a gun body, and finally returns to a circulating water return main pipe from the cooling water outlet of the outer sleeve; a movement connecting mechanism is connected with a cylinder so as to drive a spraying component to stretch out and draw back; and when the water-cooled air atomizing spray gun stops operating, the spraying component can be taken back to the inner parts of the water-cooled inner sleeve and the water-cooled outer sleeve, a spray nozzle is prevented from being burnt out, and problem, the problem that the spray nozzle is exposed in high-temperature flue gas for a long time in the past and is easy to be burnt out is solved.

Description

technical field [0001] The invention belongs to the technical field of selective non-catalytic reduction (SNCR) denitrification application technology for circulating fluidized bed (CFB) boilers, and in particular relates to a water-cooled air atomization spray gun suitable for SNCR denitrification. Background technique [0002] SNCR denitrification technology is suitable for CFB boilers. SNCR denitrification technology is to spray denitrification reducing agent (urea solution, ammonia water, etc.) X A selective reduction reaction occurs, and the product is H 2 O and N 2 , to achieve reduced NO X discharge purpose. [0003] The spray gun is one of the core equipment of the SNCR denitrification system, and the stability of the spray gun performance is the key to ensure that the reducing agent aqueous solution and the flue gas are fully mixed. At present, the existing spray guns used in the SNCR denitrification system mainly include the following types: mechanical atomiza...

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Problems solved by technology

[0004] In order to overcome the above-mentioned defects in the prior art, the object of the present invention is to provide a water-cooled air atomizing spray gun suitable for SNCR denitrification, so as to solve the problem of easy burnout, blockage, short service life and reliable reliability when the spray gun is applied to the SNCR denitrification system of CFB boiler The problem of poor performance and large amount of compressed air for cooling, the invention can avoid the technical problems that the nozzle performance is unstable, easy to burn out, and easy to block when the nozzle is in the high-temperature, high-corrosion, and high-wear smoke environment for a long time, and effectively improves the nozzle performance. service life

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