Double-fluid spray gun for denitration

Abstract

The invention discloses a double-fluid spray gun for denitration. The double-fluid spray gun for denitration comprises a gas-liquid mixing device, a gun barrel communicated with the gas-liquid mixing device and a nozzle arranged in the position, located on a spraying opening, of the gun barrel. A solution inlet and a compressed air inlet are formed in the gas-liquid mixing device, a shielding gas inlet is formed in the gun barrel, an ammonia solution storage groove is communicated with the solution inlet through an ammonia solution inlet pipe, and a solution inlet regulating valve is arranged on the ammonia solution inlet pipe. A compressed air storage device is communicated with the compressed air inlet through a first air inlet pipe and a first air inlet regulating valve is arranged on the first air inlet pipe. The compressed air storage device is communicated with the shielding gas inlet through a second air inlet pipe, a second air inlet regulating valve is arranged on the second air inlet pipe, a protective casing pipe is arranged on the outer wall of the gun barrel, one end of the protective casing pipe extends to the spraying opening of the gun barrel, and a flow guide nozzle extending out of the spraying opening of the gun barrel is arranged on the outer wall of the lower side of the portion, close to the spraying opening of the gun barrel, of the protective casing pipe. The double-fluid spray gun for denitration has the advantages that the service life is long and a liner of a water wall of a coal fired boiler can not be corroded.

Description

technical field [0001] The invention relates to a double-fluid spray gun for denitrification of a coal-fired boiler. Background technique [0002] In the denitrification industry, the structure of the currently used two-fluid spray gun for denitrification is: including an ammonia solution storage tank, a compressed air storage device, a gas-liquid mixing device, and a gun barrel connected to the gas-liquid mixing device. A nozzle is set inside the gun barrel at the nozzle; a solution inlet and a compressed air inlet are opened on the gas-liquid mixing device, and a protective gas inlet is opened on the gun barrel, and the ammonia solution storage tank passes through the ammonia water inlet pipe and the gas-liquid mixing device. The solution inlet is connected, and a liquid inlet regulating valve is arranged on the ammonia water inlet pipe; the compressed air gas storage device is connected with the compressed air inlet of the gas-liquid mixing device through the first inlet ...

AI Technical Summary

Problems solved by technology

The shortcoming of this two-fluid spray gun for denitrification is that the service life of the gun barrel is short under high temperature conditions, and when the ammonia solution is sprayed into the coal-fired boiler from the nozzle of the gun barrel, the residual ammonia solution at the nozzle of the gun barrel is very prone to hang. The whisk

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