Ship diesel engine and heat exchange device thereof

Abstract

The invention discloses a ship diesel engine and a heat exchange device thereof. The public heat exchange device comprises a fuel oil preheater and a seawater cooler, wherein the fuel oil preheater comprises a fuel oil channel and a first heat exchange cavity containing the fuel oil channel; the seawater cooler comprises a seawater pipeline and a second heat exchange cavity containing the seawater pipeline, and the shell of the fuel oil preheater is fixedly connected with the shell of the seawater cooler; and the cooled high temperature media of a ship diesel engine body are directly communicated with the first heat exchange cavity and the second heat exchange cavity. The heat exchange device provided by the invention has the advantages of compact structure, small integral structure, and no needs to occupy large space; and the structure is simple, the processing difficulty is small, and the cost is low; in addition, the interfaces of the heat exchange device are small, the probabilityof fault is greatly reduced, and the maintenance work load is decreased; and meanwhile, the high temperature media directly enter the first heat exchange cavity and the second heat exchange cavity, the high temperature media can directly exchange heat with fuel oil, the thermal loss can be effectively decreased, and the preheating effect of fuel oil is improved.

Description

technical field [0001] The invention relates to the technical field of diesel engine heat exchange, in particular to a heat exchange device for marine diesel engines. In addition, the present invention also relates to a marine diesel engine comprising the above-mentioned heat exchange device. Background technique [0002] Diesel engines play a pivotal role in the entire ship power system. In order to reduce operating costs, seaside or inland waterway ships generally do not use high-quality oil, and replace it with inferior fuel oil of lower quality. Inferior oil is generally a mixture of one or several types of oil, which contains a lot of impurities and is more viscous when the temperature is low, especially in winter. In order to reduce the viscosity of the oil and facilitate the delivery and injection of the oil, the fuel is preheated before entering the diesel engine system. [0003] In order to preheat the fuel oil, a typical marine diesel engine in the prior art add...

AI Technical Summary

Problems solved by technology

[0006] 2. The small heat exchanger has a complex structure and many interfaces, which increases the probability of failure;

[0007] 3. The preheating effect is poor, and it is difficult to fully meet the production needs

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