Opposed embedded high-pressure SCR system suitable for twin-turbine marine low-speed diesel engine

Abstract

The present invention aims to provide an opposed embedded high-pressure SCR system suitable for a twin-turbine marine low-speed diesel engine. The system is characterized in that the system comprisesa rack, an exhaust box, a left turbocharger, a right turbocharger, a left SCR and a right SCR, the exhaust box, the left turbocharger, the right turbocharger, the left SCR and the right SCR are all arranged on the rack, the exhaust box is connected with the left SCR through a left exhaust gas discharging C-shaped diverging tube, the left SCR passes through a left turbine intake C-shaped reducing pipeline, the exhaust box is connected with the right SCR through a right exhaust gas discharging C-shaped diverging tube, the right SCR passes a right turbine intake C-shaped reducing pipeline, the left SCR and the right SCR are embedded under the exhaust box in an opposed manner, the left turbocharger is arranged at the front side of the left SCR, and the right turbocharger is arranged at the front side of the right SCR. The system has the advantages of less main machine counterweight, good low-speed pressurizing effect, good mixing effect of a reaction gas and an exhaust gas, high compactness and high residual waste heat utilization rate, and can effectively reduce NOx emission of the marine low-speed diesel engine to meet IMO Tier III emission standards.

Description

technical field [0001] The invention relates to a tail gas treatment system, in particular to a marine diesel engine tail gas treatment system. Background technique [0002] With the implementation of the "Belt and Road" initiative, the status of shipping in social and economic construction has become more and more prominent. However, ship pollutants are an important source of greenhouse gases, which have caused certain damage to the air quality in port cities and inland river areas. The International Maritime Organization stipulates that after 2016, the NOx emission limit of low-speed diesel engines will be reduced to 3.4g / (KW·h) in the designated emission control area (ECA). At the same time, the Ministry of Transport of my country will also set up ship air pollutant emission control areas in the Pearl River Delta, Yangtze River Delta, Bohai Rim (Beijing-Tianjin-Hebei) region and inland navigable waters to reduce ship pollutant emissions. And in June 2018, it is planned ...

AI Technical Summary

Problems solved by technology

Since low-speed diesel engines are mostly ultra-high-power diesel engines, the exhaust temperature is lower and the exhaust pressure is low, resulting in a higher linear velocity of the SCR reactor, and the required volume of the SCR reactor will increase

At the same time, the low-pressure SCR system increases the back pressure of the turbine and the fuel consumption of the main engine; the denitrification efficiency is low, and it is difficult to meet the emission standards of IMO TierIII

[0007] Due to the large volume and weight of the SCR reactor, the existing SCR systems mainly have two types: horizontal and vertical, both of which will cause the center of gravity of the main engine system to shift, and the counterweight needs to be increased, which will increase the energy consumption of the diesel engine

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