Intake system of marine diesel engine

Abstract

The invention relates to an intake system of a marine diesel engine. The intake system comprises a cylinder head, a piston connecting rod mechanism arranged inside the cylinder head, an intake port and an exhaust port arranged in the cylinder head, an intake valve arranged at the intake port, an exhaust valve arranged at the exhaust port, and an intake pipe and an exhaust pipe which are connectedto the cylinder head, wherein the intake pipe is connected to the intake port; the exhaust pipe is connected to the exhaust port; a bypass gas taking pipe is connected between the intake pipe and theexhaust pipe; the bypass gas taking pipe is provided with an electric control valve; an energy recovery mechanism is arranged in the bypass gas taking pipe; a pressure sensor is arranged on the innerwall of the intake pipe; and an oxygen extraction device is connected to the intake pipe. According to the intake system of the marine diesel engine, the diesel engine performs combustion work by mixing pure oxygen and exhaust gas together as intake gas of the diesel engine. Energy in the exhaust gas can be recovered through the energy recovery mechanism arranged in the bypass gas taking pipe, andthe recovered energy is used for power generation. Therefore, energy conservation and environmental protection are achieved, and at the same time, the working stability in the diesel engine can be guaranteed.

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 supercharged by a supercharger, and then cooled by an intercooler, and then enter the intake pipe. Enter the cylinder.[0003]In the working process of diesel engine, because of the high temperature and pressure in the cylinder, it is easy to produce a large amount of nitrogen oxide NOx. Because the relevant emission regulations have strict requirements on nitrogen oxide NOx, the use of EGR exhaust gas recirculation or SCR selective catalysis has appeared. Reduction and other methods to control the emission of nitrogen oxides NOx. Among them, the cost of adopting the SCR selective catalytic reduction scheme is very high, which increases the user's...

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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

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