Ammonia spraying and uniform-mixing device capable of automatically adjusting ammonia flow based on amount of flue gas

Abstract

The invention discloses an ammonia spraying and uniform-mixing device capable of automatically adjusting ammonia flow based on the amount of flue gas. The device comprises an ammonia spraying main tube, ammonia spraying branch pipes, elastic rotating supports, swirling spraying pipes and swirling plates, wherein the ammonia spraying branch pipes are arranged in parallel on the ammonia spraying main tube at equal interval; the swirling spraying pipes are in threaded matched connection with the swirling plates to form gas-solid interacting force transmission elements and small-sized rotating turbine mixers; the elastic rotating supports are arranged in positioning grooves in the upper ends of the ammonia spraying branch pipes, and steel balls at the tops of the supports are sunken in positioning notches in the swirling spraying pipes, so that the ammonia spraying branch pipes are sleeved with the swirling rotating pipes. According to the device, gas-solid interacting force is combined with the elasticity of springs, so that the problems of automatic adjustment of the ammonia spraying amounts of different ammonia spraying branch pipes on the same ammonia spraying main tube along with changes of the amount of the flue gas are solved, and non-uniform flue gas amount is actually matched with non-uniform ammonia spraying amount; moreover, the reaction thrust of multi-hole ammonia spraying in the same direction is used for realizing the dynamic and continuous ammonia supply of ammonia spraying points.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and in particular relates to an ammonia injection uniform mixing device which automatically adjusts the flow rate of ammonia gas based on the amount of flue gas. Background technique [0002] Selective catalytic reduction (SCR) is a treatment process for downstream working fluids. Its principle is to inject NH into flue gas containing NOx 3 The reducing agent, under the appropriate temperature conditions (usually 300~400°C), through the catalytic action of the catalyst, the NOx in it is reduced to N 2 and H 2 O. Flue gas and NH 3 Proper mixing is a key factor in the success of SCR. If flue gas and NH 3 Uneven mixing will not only reduce the denitrification efficiency, but also increase the escape rate of ammonia, which is easily mixed with SO 2 SO formed by catalytic oxidation 3 The reaction produces ammonium sulfate or ammonium bisulfate with strong cohesiveness, thereby...

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Problems solved by technology

[0008] Purpose of the invention: the present invention is aimed at the fact that large-scale vortex mixers are difficult to achieve local uniform mixing because they only rely on vortex disturbance, and that small-scale ammonia injection grids require a long mixing distance to achieve uniform mixing because they only rely on convection and diffusion and lack local disturbances. The nozzles arranged side by side on the same ammonia injection pipe of the ammonia injection grid cannot individually adjust the amount of ammonia injection according to the uneven inflow of flue gas, and provide an ammonia injection uniformity that automatically adjusts the flow rate of ammonia gas as the amount of flue gas changes. mixing device

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