Soot blowing system for SCR reactor

Abstract

A soot blowing system for an SCR reactor is mounted on the SCR reactor. A plurality of catalyst layers are arranged in the SCR reactor. The soot blowing system comprises a filtering pressure reducing device which is connected with a compressed air source, wherein the downstream part of the filtering pressure reducing device is simultaneously connected with a plurality of air bottles; the downstream part of each air bottle is simultaneously connected with two air supply branches; each air supply branch comprises two soot blowing branches which are connected with each other in parallel; each soot blowing branch comprises a solenoid valve and a nozzle which are connected with each other; each solenoid valve is positioned on the upstream part of the corresponding soot blowing branch; each nozzle is positioned on the downstream part of the corresponding soot blowing branch; each two air supply branches which are connected with the same air bottle are respectively arranged in front of the different catalyst layers in the SCR reactor; and at least two air supply branches which are connected with the different air bottles are arranged in front of each catalyst layer. The air supply branches and the nozzles of each air bottle are arranged at the different catalyst layers in an intersected manner, the soot blowing efficiency is improved, the reliability and the stability of the soot blowing system are also improved, and the emission reduction performance of the SCR reactor is guaranteed.

Description

technical field [0001] The invention relates to a treatment device for marine diesel engine tail gas, in particular to a soot blowing system for an SCR reactor, which belongs to the technical field of diesel engines. Background technique [0002] With the development of the international shipping industry and ocean-going shipping, exhaust emissions from marine engines fueled by diesel fuel have become a major source of pollution in coastal areas, especially ports. The pollution of atmospheric environment caused by NOx in the exhaust gas of marine diesel engines has aroused widespread concern in the international community. [0003] The more stringent third-stage (Tier III) NOx emission regulations of the International Maritime Organization (IMO) will be implemented in NOx emission control areas from January 1, 2016. [0004] Selective catalytic reduction (SCR) system can effectively reduce NOx emissions from diesel engines. However, particulate matter such as soot in diesel...

AI Technical Summary

Problems solved by technology

[0004] Selective catalytic reduction (SCR) system can effectively reduce NOx emissions from diesel engines. However, particulate matter such as soot in diesel engine exhaust and ammonium sulfate formed in the SCR system tend to accumulate on the surface of the catalyst in the SCR reactor, and even block the pores of the catalyst. channel, which makes the catalyst lose its activity and reduces the emission reduction performance

The conventional reactor soot blowing system cannot quickly and effectively blow off the attachments on the surface of the catalyst, and the pressure stabilization time is short, so the reliability of the soot blowing system is poor

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