Novel anti-blocking countercurrent jet type ammonia injection grid specially used for SCR denitration

Abstract

The invention provides a novel anti-blocking countercurrent jet type ammonia injection grid specially used for SCR denitration. The novel anti-blocking countercurrent jet type ammonia injection grid comprises a flue, an ammonia gas main tube is arranged outside the flue, the ammonia gas main tube is sequentially equidistantly communicated with a plurality of jet tubes, extending to the left and right, from front to back, the right sidewall of the flue is provided with a plurality of mounting holes for the jet tubes to extend into the flue, mounting flanges are arranged outside the mounting holes correspondingly, the jet tubes extend into the flue from the mounting holes, the mounting flange at the right part of every jet tube is provided with a jet tube flange, every jet tube flange is fixed on the corresponding mounting flange by bolts and nuts, fixing clamp seats for the left ends of the jet tubes to be clamped in are arranged at the inner side of the left sidewall of the flue, a plurality of nozzles are equidistantly axially arranged in positions, located in the flue, of the jet tubes, and jet tube supporting bridges extending to the left and right are arranged in the flue. Thenovel anti-blocking countercurrent jet type ammonia injection grid greatly saves the mixing time of flue gas and ammonia gas, and can be mounted and work in the short-distance flue, so the countercurrent contact with the flue gas is met, and the ammonia gas is jetted to cover the entire flue.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment equipment, in particular to a novel anti-clogging SCR denitrification special-purpose countercurrent injection ammonia injection grid. Background technique [0002] In the common SCR denitrification process, each company will consider designing ammonia injection equipment at a certain position in the reactor inlet flue to ensure that the NH in the flue gas at the SCR reactor inlet 3 / NO x The distribution is uniform, which is conducive to the reaction between the catalyst and the flue gas in the SCR reactor, and maintains a high denitrification efficiency. [0003] The ammonia injection equipment is usually designed on the vertical pipeline between the flue gas heating equipment and the SCR reactor. Due to the influence of the height of the steel structure, this section of the pipeline is generally short, and sufficient uniform mixing must be ensured in such a short pipeline. As a res...

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Problems solved by technology

[0008] Ammonia injection grids are mainly counter-flow type according to the flow direction of ammonia injection. Although the traditional counter-flow type can enhance the mixing effect, the following technical problems are prone to occur: 1. Due to the positive contact between the nozzle and the counter-flow of flue gas, the nozzle wears seriously, and the nozzle deforms for a period of time As a result, the amount of ammonia sprayed deviates, and when the damage reaches a certain level, it needs to be replaced as a whole; 2. It is not easy to disassemble for maintenance after damage; 3. The traditional nozzle has holes on the outer wall of the branch pipe, and the nozzle is not wear-resistant

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