Rotary jet mixer of SCR (Selective Catalytic Reduction) system

Abstract

The invention aims to provide a rotary jet mixer of a SCR (Selective Catalytic Reduction) system. The rotary jet mixer of the SCR system comprises a shell, a vane wheel, a pipe support bracket and a rotation joint, wherein the pipe support bracket is fixed in the shell in a direction parallel to the end face of the shell; the rotation joint is fixed on the pipe support bracket; a vane wheel shaft is connected with the rotation joint; the vane wheel is mounted at the end of the vane wheel shaft; a guide pipe is mounted on each vane wheel; the guide pipes are capable of rotating along with the vane wheels; spraying heads are mounted on the guide pipes; the vane wheel shaft and the pipe support bracket are hollow structures; the vane wheel shaft is communicated with the hollow structures of the pipe support bracket; the guide pipes are communicated with the hollow structures of the vane wheel shaft; a connection joint is mounted on the outer wall of the shell and communicated with the pipe support bracket. The rotary jet mixer is simple in structure, convenient to assemble, disassemble and maintain, capable of mixing fully and operating without blockage; the rotary jet mixer is integrated with functions of jetting and mixing; the rotary jet mixer is applicable to the field of gas-gas mixture and gas-liquid mixture and especially applicable to a mixture of carbamide solution and smoke in the selective catalytic reduction (SCR) system.

Description

technical field [0001] The invention relates to an injection and mixing device, in particular to an injection and mixing device for an SCR system. Background technique [0002] At present, the application of selective catalytic reduction (SCR) technology to reduce nitrogen oxide emissions in flue gas has become more and more widespread. It is very convenient and safe to use urea aqueous solution as the reducing agent for the SCR denitrification reaction. The urea aqueous solution is sprayed into the flue, and the ammonia gas generated by thermal decomposition of the urea aqueous solution reacts with the nitrogen oxides in the flue gas to form nitrogen and water. Therefore, this requires that the ammonia gas must be mixed evenly with the flue gas before entering the SCR reactor, otherwise it will lead to a higher ammonia slip rate and a lower denitrification rate. [0003] Usually, a static mixer is installed in front of the SCR reactor to promote the mixing of ammonia and ...

AI Technical Summary

Problems solved by technology

[0004] The existing static mixer is applied to the SCR system. On the one hand, the pressure loss is relatively large. On the other hand, urea crystallization is easy to block the mixer, and it is inconvenient to install and disassemble.

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