How a plate heat exchanger work and advantage in turbine generators?

- Jun 26, 2018-

Plate heat exchanger are generally used in turbine generators to effectively control oil temperature changes during operation. Its sealing performance and heat transfer performance are very strong, the following content is its specific application situation in the generator:


The main components of the plate heat exchanger are the upper and lower water chambers, the shell pipe system and the oil-filled pipeline. The housing is connected with the inlet and outlet pipes, the inlet and outlet oil pipes, the drain pipe, the oil discharge pipe, the exhaust pipe and the thermometer seat. Turbine generator set is running normally, part of the power is consumed due to bearing friction, and oil-water cooler converts heat into bearing oil temperature. If the oil temperature is too high, the bearing may be softened, deformed or burned. 


In order to make the bearings run normally, the temperature of the lubricating oil must be kept within a certain range. Generally, it is required to enter the bearing oil at 35-45°C. The oil temperature rise of the bearing is generally 10~15°C, so the oil discharged from the bearing must be cooled before it can be recycled into the bearing lubrication. Plate coolers are used to cool the main engine oil. The lubricating oil with higher temperature and the cooling water with low temperature exchange heat in the plate cooler, and the purpose of controlling the temperature of the lubricating oil is achieved by adjusting the flow rate of the cooling water. (At the same time, due to the higher rotor temperature, especially on the inlet side of the high pressure cylinder, the oil and water cooler journal also transfers heat outwards, so the lubricant also has the effect of cooling the journal)


High heat transfer efficiency: Plate corrugated film design has a high thermal conductivity target, special flow, This is caused by the corrugation of the plate making the fluid at a low flow rate (turbulent flow) can be a powerful turbulence, with flow disturbances and net effects, preventing cooler fouling formation and high heat transfer efficiency.


Responsiveness: Because the heat exchange plate is easy to disassemble, the most suitable heat transfer effect and capacity can be obtained by adjusting the number of heat exchange plates or the heat exchange process. As long as the cooler middle frame is used, the cooler has many unique features. This allows the user to change the amount of processing and change the value of the heat transfer coefficient or add new features at any time. 


Small heat loss: Due to its compact structure and small size, the cooler has a small surface area and a small heat loss, and the equipment is usually no longer needed. 


Safe and reliable to use: Designing two seals between plate seals with signal holes. In the event of a leak, an external cooler can be used to prevent the two media from mixing together and play an important role in safety alarms.


Low temperature heat source: The minimum temperature difference between the two media plate coolers can reach 1oc due to the almost full flow of both media and heat transfer effects. It can be used to recover low temperature heat or use a cold reservoir as an ideal device. 


Small cooling water: Plate coolers are caused by the geometry of the runners, and the thermal efficiency of the two liquids is high. Greatly reduce the consumption of cooling water. This in turn reduces the installation costs of pipes, valves and pumps. The structure of the plate cooler is extremely compact, the space occupied by the cooler is only 1/2 to 1/3 of the shell cooler, and there is no need to have enough space to pull the tube out for repair. The plate cooler can be contacted with 100% of the hot plate surface of the original plate only by loosening the clamping screw, and it is easy to disassemble.


Less loss of resistance: With the same heat transfer coefficient, the plate cooler can be controlled by reasonable flow rate control, and the resistance loss can be controlled within 1/3 of the shell cooler.


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