Composite device for aftertreatment of ship low-speed diesel engine end gas

Abstract

The invention provides a composite device for aftertreatment of ship low-speed diesel engine end gas. The composite device comprises a denitration system and a washing system. A diesel engine is connected with an gas inlet header through a gas inlet pipe, the gas inlet header is connected with a gas compressor through a rear pipeline of the gas compressor, the diesel engine is connected with a gas outlet header through a gas outlet pipe, the gas outlet header is connected with an inlet of a turbine through a front pipeline of the turbine, an outlet of the turbine is connected with an outlet pipeline, and the outlet pipeline is connected with the denitration system and the washing system. According to the composite device, an SCR (selective catalytic reduction) system is positioned in rear of a turbocharger to facilitate flexible arrangement of an SCR device, the temperature of front end gas of a reactor is increased by bypassing front high-temperature end gas of the turbine, energy consumption is lowered, and sediments in the reactor is removed through afterburning and temperature increasing of backflow end gas. The composite device has the advantages that removal efficiency for pollutants of NOx, SO2 and particles is high, limit values of emission regulations specified by domestic and abroad organizations such as IMO (international meteorological organization) can be met, and operation mode switching of ships in international waters and emission-controlled regions during sailing can be achieved.

Description

Technical field [0001] The invention relates to a diesel engine system, specifically a diesel engine tail gas treatment device. Background technique [0002] In recent years, with the rapid development of the shipbuilding industry, the content of NOx, SO2 and particulate matter emitted by its power plants has further increased, and the requirements for the control of exhaust emissions have become more and more stringent. The NOx, SO2 and particulate matter discharged into the air from marine main and auxiliary engines, oil-fired boilers and incinerators will cause great harm to humans and the environment. The Chinese government has also formulated relevant regulations for the emission of ship exhaust pollutants. The core port area within the emission control area is determined. [0003] The measure used to remove nitrogen oxides in the tail gas of ships' low-speed engines is usually high-pressure SCR before the turbine. The exhaust temperature is relatively high, which meets the r...

AI Technical Summary

Problems solved by technology

The flue gas heating method described in this plan requires large-scale equipment such as heat exchangers. For ships with high space utilization, it is not feasible to change the flue gas heating method, and it is not suitable for denitrification devices installed on low-speed diesel engine superchargers of ships The latter scheme, and does not consider the problems of reactor fouling and wastewater treatment, the scheme described in this patent is not suitable for ships

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