Air intake system of a marine diesel engine

Abstract

The invention relates to an air intake system of a marine diesel engine, comprising a cylinder head, a piston connecting rod mechanism arranged inside the cylinder head, an air inlet and an air outlet arranged in the cylinder head, and an air intake valve arranged at the air inlet , the air outlet valve located at the air outlet place, the air intake pipe and the air outlet pipe connected to the cylinder head, the air inlet pipe is connected with the air inlet pipe, the air outlet pipe is connected with the air outlet pipe, and the air inlet pipe and the air outlet pipe are connected A bypass air intake pipe is connected, and an electric control valve is provided on the bypass air intake pipe, an energy recovery mechanism is installed in the bypass air intake pipe, a pressure sensor is installed on the inner wall of the intake pipe, and an oxygen gas is connected to the intake pipe extraction device. In the air intake system of the marine diesel engine, the diesel engine uses pure oxygen mixed with exhaust gas as the intake air of the diesel engine for combustion. The energy recovery mechanism in the bypass air intake pipe can recover energy from the exhaust gas and use the recovered energy for power generation. , Energy saving and environmental protection can also ensure the working stability of the diesel engine.

Description

technical field [0001] The invention belongs to the field of diesel engines, and in particular relates to an air intake system of a marine diesel engine. Background technique [0002] As we all know, when a diesel engine is working, the intake air is usually taken directly into the atmosphere. For supercharged and intercooled models, it needs to be boosted by the supercharger first, then cooled by the intercooler and then enter the intake pipe. into the cylinder. [0003] During the working process of the diesel engine, because the temperature and pressure in the cylinder are high, it is easy to produce a large amount of nitrogen oxides NOx, because the relevant emission regulations have strict requirements on nitrogen oxides NOx, so the use of EGR exhaust gas recirculation or SCR selective catalytic Reduction and other methods to control the emission of nitrogen oxides NOx. Among them, the cost of using the SCR selective catalytic reduction scheme is very high, which incr...

AI Technical Summary

Problems solved by technology

Among them, the cost of using the SCR selective catalytic reduction scheme is very high, which increases the user's cost of use. After a certain period of use, the problem of catalyst reduction and failure will occur, resulting in a reduction in the ability to treat exhaust gas; while the application of EGR exhaust gas recirculation is only limited In the use of small and medium power diesel engines

[0004] At present, some diesel engines use exhaust gas recovery and mixed oxygen for intake air, which can effectively reduce the harmful exhaust gas generated when the air is directly introduced into the air. However, there is no corresponding exhaust energy recovery mechanism for the exhaust gas when it is reused. Recycling the energy stored in the exhaust gas, such as heat energy, leads to a large loss of energy and poor stability

Images