Marine diesel engine exhaust heat exchanger

Abstract

The invention discloses an exhaust gas heat exchanger for a marine diesel engine, which comprises a box body in which interconnected heat exchange tubes are arranged, and the direction of the heat exchange tubes is perpendicular to the flow direction of the exhaust gas in the box body; the two ends of the heat exchange tube It is connected with a medium conduit for the medium to enter and exit; there is a winding tube at the inlet of the exhaust gas, and a number of fins are set on the heat exchange tube, and the fins are arranged in a non-uniform form: the fins near the center of the box are closely arranged to form a dense part; The fins near both sides of the box body are sparsely arranged to form a sparse part; a buffer mixing zone is provided between two adjacent fin clusters. The heat exchanger can greatly reduce the flow velocity of the exhaust gas, so that the exhaust gas is in uniform and full contact with the heat exchange tube. After the fin cluster, it can stay and mix in the buffer mixing zone to improve the uniformity of the exhaust gas; the whole heat exchanger has higher heat exchange efficiency and can effectively recover waste heat from the exhaust gas of the diesel engine.

Description

technical field [0001] The invention relates to the technical field of heat source conversion, in particular to a marine diesel engine exhaust heat exchanger. Background technique [0002] When a diesel engine continues to operate, the temperature of its exhaust gas is as high as 300-450 °C. The exhaust gas not only contains harmful substances such as nitrogen oxides and carbon particles that pollute the environment, but also has a large amount of heat energy. If the exhaust gas is not treated and used, it will be directly discharged, which will not only pollute the surrounding working environment, but also waste a lot of heat energy. [0003] Chinese patent CN102889112A discloses a diesel engine exhaust heat exchange device, which includes a water collecting chamber, an expansion joint, a thermal insulation shell, a heat exchange tube assembly, an elbow and a bracket; the device utilizes circulating cooling water and diesel engine exhaust for heat exchange, so that the The...

AI Technical Summary

Problems solved by technology

[0004] However, the existing heat exchange equipment including the above-mentioned patents cannot be adapted to the use of marine diesel engines. The reason is that, compared with general diesel engines, the exhaust gas flow rate output by marine diesel engines is larger, and traditional heat exchangers are not designed for high-velocity exhaust gas. Design, the high-speed exhaust gas quickly passes through the heat exchange equipment, the thermal interaction time between the heat exchange tube and other components and the exhaust gas is short, the heat exchange efficiency is not high, and the heat energy in the exhaust gas cannot be fully recovered

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