Atomizing spray gun for flue, and flue gas treatment system

Abstract

The invention provides an atomizing spray gun for a flue. The atomizing spray gun comprises a spray gun tube and an air jet tube, wherein one end of the spray gun tube is provided with a liquid inletand a compressed air inlet, the other end of the spray gun tube is provided with an atomizing spray nozzle, the air jet tube is arranged along the length direction of the spray gun tube, one end, close to the liquid inlet, of the air jet tube is provided with an air inlet, the other end of the air jet tube is provided with air outlets, and the air outlets are arranged near and toward the atomizingspray nozzle. The atomizing spray gun realizes evaporation treatment of desulfurization wastewater in the flue located after a denitrification apparatus and before an air preheater, and at the same time, the problem of scaling and blocking of the atomizing spray nozzle is relatively well treated. The axis of a spray center is perpendicular to the axis of a spray gun rod, the design of a spray-blowing structure is simple and reliable, the installation is convenient, the control is effective, the taking and using of an air source is convenient, the air source does not affect the compressed airfor spray gun atomization, and a distance between a spray-blowing port and the spray nozzle, and a diameter size of the spray-blowing port are verified by experiments to be reliable and effective.

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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