Ship diesel engine NOx and Sox combined emission reduction device and control method

Abstract

The invention provides a ship diesel engine NOx and Sox combined emission reduction device and a control method. When a non-nitrogen-oxide discharging control area works at a non EGR mode, waste gas from an exhaust manifold branch drives a turbine to work, an air compressor is driven to compress the air, and the compressed air enters an engine to be burned through a scavenging air box; when a ship travels in a nitrogen oxide discharging control area, the device works at the EGR mode, partial waste gas is discharged from the exhaust manifold branch, the temperature of the waste gas after being cooled and washed is reduced, particles and SOx in the waste gas can be eliminated, then the waste gas is pressurized through an EGR fan and mixed with fresh air, the NOx generation and emission amount of the engine can be reduced, and the Tier III standard of IMO related to the NOx emission can be satisfied; when the ship stays in a sulfur discharging control area or port, the device works at a washing mode, the waste gas is discharged into the atmosphere after being desulphurized by a washing desulphurization device, and the requirement of IMO on sulfur content of the ship fuel can be met; when the ship stays in a non-sulfur discharging control area and a non-port area, the device works at a non-washing mode, and the discharged waste gas is directly discharged in to the atmosphere.

Description

technical field [0001] The present invention relates to a ship exhaust pollutant emission control device, in particular to a joint control device and control method for marine diesel engine NOx and SOx to meet the International Maritime Organization (IMO) regulations on ship exhaust pollutant emission. Background technique [0002] In order to reduce ship operating costs, ocean transport ships use high-sulfur heavy oil, and the NOx and SOx produced by engine combustion have caused serious harm to the marine atmosphere and port environment. [0003] IMO and developed countries such as Europe and the United States have imposed strict restrictions on NOx and SOx emissions in ship engine exhaust. [0004] At present, commonly used NOx emission reduction measures mainly include in-machine emission reduction measures and out-of-machine emission reduction measures. The internal emission reduction measures are through certain methods, such as delaying fuel injection in the cylinder...

AI Technical Summary

Problems solved by technology

This exhaust gas series treatment method has huge equipment volume and high back pressure, which has a great impact on the normal operation of the engine, and the equipment investment and operation costs are very high.

[0009] So far, there is no integrated treatment device for NOx and SOx emitted by marine diesel engines at home and abroad, which can reduce the size and cost of emission control equipment and reduce emission reduction while meeting IMO's requirements for NOx and SOx emissions. The impact of equipment on ship operating costs and effective space

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