Horizontal box type maintainable exhaust gas after-treatment device for ship engine

Abstract

The invention relates to a diesel engine exhaust gas after-treatment device, and provides a horizontal box type maintainable exhaust gas after-treatment device for a ship engine. The horizontal box type maintainable exhaust gas after-treatment device comprises a gas inlet pipe, a urea nozzle, a mixer, a tank body, a catalysis assembly and a gas outlet pipe, wherein the urea nozzle is arranged on the gas inlet pipe; the mixer comprises a vortex mixer and a split mixer which are oppositely arranged; the vortex mixer is connected with an inner end of the gas inlet pipe; the split mixer is arranged outside a front end cover of the tank body; the catalysis assembly is arranged in the tank body; a rear end cover of the tank body is connected with the gas outlet pipe. The horizontal box type maintainable exhaust gas after-treatment device has a compact structure, solves problems of arrangement and disassembly of a square industrial catalyst carrier, adopts a replaceable catalyst and cleanable urea crystals to reduce use costs, improves a urea mixing effect by two mixer structures, and solves problems of uneven urea mixing and high risk of urea crystallization of a ship engine after-treatment device.

Description

technical field [0001] The invention relates to a diesel engine exhaust aftertreatment device, in particular to a marine engine horizontal box type maintainable exhaust aftertreatment device. Background technique [0002] With the promulgation and implementation of the national non-road machinery emission regulations, the new emission standards have extremely strict standards for marine engine exhaust pollutants, and after-treatment devices must be installed to meet the emission standards. The most common practice at present is to use selective catalytic reduction (SCR) catalysts to reduce NOx emissions, and SCR catalysts have become key equipment to meet off-road emissions. However, most of the existing SCR catalysts for marine engines or engine sets are fixed-bed structures, which have problems such as occupying a large space, the catalyst cannot be disassembled, and the risk of urea crystallization is high. Moreover, once urea crystallization occurs inside the SCR cataly...

AI Technical Summary

Problems solved by technology

However, most of the existing SCR catalysts for marine engines or engine sets are fixed-bed structures, which have problems such as occupying a large space, the catalyst cannot be disassembled, and the risk of urea crystallization is high.

Moreover, once urea crystallization occurs inside the SCR catalyst, it is impossible to clean and maintain and replace the catalyst, and only the entire SCR catalyst can be replaced, resulting in huge usage and replacement costs

Images