Marine diesel engine SCR system workshop arrangement structure

Abstract

The invention discloses a marine diesel engine SCR system workshop arrangement structure, and relates to the technical field of marine SCR systems, in particular to the marine diesel engine SCR system workshop arrangement structure. The marine diesel engine SCR system workshop arrangement structure comprises an SCR reactor, an SCR air inlet pipe, an SCR air outlet pipe and a fixed support. The air inlet end of the SCR reactor is fixedly connected with the SCR air inlet pipe, and the air outlet end of the SCR reactor is fixedly connected with the SCR air outlet pipe. According to the marine diesel engine SCR system workshop arrangement structure, expansion joints and fixing supports of an SCR system are reduced, pipeline arrangement is simplified, the design period is shortened, meanwhile, SCR system arrangement is simplified, the production period and production cost are effectively reduced, the number of expansion joints is reduced, vibration of the SCR system in the train moving process is effectively relieved, fixing supports of SCR pipelines are reduced, the installation period is shortened, installation is convenient, and the phenomena of expansion joint deformation and fixing support fracture in the SCR system workshop train moving process are effectively reduced.

Description

technical field [0001] The invention relates to the technical field of marine SCR systems, in particular to a workshop arrangement structure of a marine diesel engine SCR system. Background technique [0002] Selective catalytic reduction technology (SCR) is a treatment process for NOx in diesel vehicle exhaust emissions, that is, under the action of a catalyst, the reducing agent ammonia or urea is injected to reduce the NOx in the exhaust gas to N2 and H2O. There are two types of catalysts, noble metals and non-noble metals. The basic working principle of the system is: the exhaust gas comes out of the turbine and enters the exhaust mixing pipe. A urea metering and injection device is installed on the mixing pipe, and the urea aqueous solution is sprayed. The urea generates NH3 after hydrolysis and pyrolysis at high temperature. The catalyst surface of the system uses NH3 to reduce NOX and discharge N2, and the excess NH3 is also oxidized to N2 to prevent leakage. Genera...

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Problems solved by technology

However, due to the complex structure of the SCR system, high technical requirements, and severe vibration of the SCR system, the fixed support of the SCR system needs to be considered during the design process, resulting in a long period of SCR design and commissioning, high commissioning costs, difficulty in on-site installation in the workshop, and a long installation period. The phenomenon of deformation of the expansion joint and fracture of the fixed support still occurs during the moving train process. From this, it can be seen that the existing marine diesel engine SCR system mainly has the following problems: the SCR system has high technical requirements, and the design cycle is long; The cost is high; the SCR system vibrates violently during the moving process, and the SCR pipeline needs to add more fixed supports, resulting in a long and difficult installation period in the workshop; SCR systems still often experience expansion joint deformation and fixed support breakage during the moving process of the workshop. Expansion joints need to be replaced and repaired to fix the support, resulting in an increase in the cost of workshop tooling and repair work. Therefore, we propose a marine diesel engine SCR system workshop layout structure and solve the above-mentioned problems

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