PLATE HEAT EXCHANGER IN MARINE INDUSTRY

In the marine turbine, the heat exchanger is to ensure that the turbine is in normal equipment. Of course, there are many common heat exchangers, such as runner type and plate type. The advantages and disadvantages of different heat exchangers are very obvious. The plate type heat exchanger is often used in the electrical equipment of the turbine engineering. This type of heat exchanger is small in size and relatively high in efficiency. It has been used in marine turbines, but it is in urgent need of further promotion. Based on the current situation, the actual application of the plate heat exchanger is introduced in detail.

In the marine turbine, heat exchange is undoubtedly a very critical factor to ensure the normal use of the turbine. When the turbine is working, it needs to maintain a certain temperature to ensure the normal operation of the machinery. At present, there are many heat exchangers in the marine turbine. Among them, the plate type is a very important one, and it is a machine with great potential for development in the future.

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Structure and characteristics of plate heat exchangers Working principle and structure type. The principle of the heat exchanger is actually very simple, basically, it is basically composed of many channel plates, only one blind plate, and endplates. The latter is located at both ends of the heat exchanger, so it is very helpful for the conduction of the heat exchanger and the sealing of the channel. In this system, basically the hot air flows into the other direction from one direction, and The channel plate is where the media exists.

When the air is present, these media are basically heat dissipation media. When the hot air is in contact with these media, the purpose of heat dissipation is achieved. Of course, such equipment has been used in many industries. Both are very widely used, not just in the shipping industry. The common forms are as follows:
Plate-fin heat exchanger. It is composed of many originals. Among these originals, the separator and the fins are undoubtedly important, and they are basically the most critical elements in heat exchange. At present, there are two methods in the design process, the first one is the countercurrent type, and the second one is the cross-type.

Parallel plate heat exchanger. In this heat exchanger, it is mainly composed of many parallel thin plates that are loved. For each flat plate, a special sealing material is used to block it, ensuring the exchange of hot air and cold air.

Spiral plate heat exchanger. The designed effect is a spiral channel. This spiral channel is made of a very thin metal plate, and the distance is equidistant. The advantage of this plate heat exchanger is the large surface area, so the effect of heat transfer is very nice.

The application of plate heat exchangers in marine turbines Heat exchangers has become one of the indispensable important equipment in ships. For example, heat exchangers are used in the main and auxiliary engine oil cooler, cylinder liner water cooler, fuel heater, steam condenser, feedwater heater, and other equipment. However, the special working environment of the ship has very strict requirements on the heat exchanger.

Among them, the special environment includes factors such as instability on the sea surface, which may encounter working conditions such as vibration, impact, large-angle tilt and noise; the cooling medium is generally seawater, which contains The salt concentration is large, the working environment humidity is high, and the corrosiveness to the plate is very strong.

The space of the ship itself is very compact, and the space and quality of the heat exchanger are more strictly restricted. The heat transfer medium of traditional heat exchangers is often water, The heat transfer medium of the ship heat exchanger is generally oil and water. The emergence of plate heat exchangers effectively solved a large part of the problem:

The equipment required for ships requires a compact structure and low quality. At present, plate heat exchangers are generally considered to be very small compared to traditional heat exchangers in the use of marine turbines. To this end, the finite element analysis method is used. At the same time, in order to meet the requirements of marine equipment, the unnecessary parts of the plate body are removed or reduced according to the actual stress and strain distribution, and the weak parts are locally thickened. Integral cutting method is used to reduce the influence of welding deformation on the strength of the board body, and then the inner board and the panel are welded together, and then the residual stress is removed for heat treatment.

Aiming at impact, shaking, vibration and other issues. The multi-point fixing method at the bottom of the plate body is adopted, that is, all the parts that can be fixed are fixedly connected, and some important special parts are also used to strengthen the main structure, thereby increasing the stability of the equipment.

The cooling medium is seawater, and the concentration of nitrogen ions is very high. Because many turbines are in direct contact with seawater, the medium used for heat exchange during the use process has a very large impact. Therefore, the upper plates used in turbines are usually choose materials with high corrosion resistance.