Atomizing spray gun and flue gas treatment system for flue

Abstract

The invention provides an atomizing spray gun for a flue, which includes a spray gun tube and an air spray tube. One end of the spray gun tube is provided with a liquid inlet and a compressed air inlet, and the other end is provided with an atomizing nozzle. The air spray tube is arranged along the The length direction of the spray gun tube is arranged, and one end of the spray tube close to the liquid inlet is provided with an air inlet, and the other end is provided with an air outlet, and the air outlet is arranged close to and facing the atomizing nozzle. The atomizing spray gun of the present invention realizes the evaporation treatment of desulfurization wastewater in the flue after the denitrification device in front of the air preheater, and at the same time better solves the problem of fouling and clogging of the atomizing nozzle. The design is simple and reliable, the installation is convenient, the control is effective, the air source is easy to use, and it does not affect each other with the compressed air used for atomization of the spray gun.

Description

technical field [0001] The invention relates to the technical field of flue evaporation and atomization, in particular to an atomization spray gun for a flue and a flue gas treatment system. Background technique [0002] At present, coal-fired power plants mainly use limestone-gypsum wet flue gas desulfurization process. In this process, the desulfurization circulating slurry continuously absorbs chloride from the flue gas and limestone, resulting in an increase in the concentration of chloride ions, which will bring many adverse effects, such as inhibiting the dissolution of limestone and reducing the pH value of the slurry , affect the absorption effect of sulfur dioxide, make calcium sulfate (CaSO4) easy to scale, and easily lead to corrosion of metal materials. In addition, the high concentration of chloride ions will also affect the quality of gypsum, a by-product of desulfurization. In order to ensure the normal operation of the desulfurization system and the quality...

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Problems solved by technology

[0004] Although the existing domestic and foreign atomizing spray guns used in flue evaporation for desulfurization wastewater have solved the problem of material corrosion resistance (the CL- content of desulfurization wastewater is high and the corrosion is strong)—the use of dual-phase steel and Hastelloy , Monel alloy, titanium, etc., but there are cases where the nozzle is blocked by soot adhesion, especially some soot and mist liquid (high salt characteristics of desulfurization wastewater) polymerize or form a mixture after chemical reaction, this mixture The viscosity becomes very large, and it is easy to adhere to the nozzle of the spray gun. After a period of time, this mixture accumulates near the nozzle as a "foreign matter" that affects the nozzle spray, and even blocks the nozzle; Shut down operation, resulting in fouling inside the nozzle of the spray gun. The reason for the fouling is due to the high-salt characteristics of the desulfurization wastewater. Under the high temperature environment of the flue, the residual desulfurization wastewater inside the nozzle quickly evaporates and crystallizes.

[0005] The domestic treatment of the clogging of the above-mentioned spray guns is generally to add a protective tube to the spray gun rod, or to add a protective cover to the nozzle, or to add protective gas and manual cleaning, etc., but none of them can completely solve the problem of spray gun clogging

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