The system uses energy-saving water film air cooler to replace the original plate heat exchanger and cooling tower, which has high operating efficiency, the circulating amount of cooling water can be reduced by 4/5, and its operating power can also be reduced by 4/5. At the same time, the system adopts normal temperature deaeration equipment and degassing device, which can further reduce corrosion and ensure the stable and safe operation of the system.
The structure and process of energy-saving water film air cooler are shown in the following figure.
The main feature of energy-saving water film air cooler is to enhance heat transfer through evaporation of water film outside the tube. Its working process is to use the circulating water pump to transport the circulating cooling water in the circulating water tank to the water spraying system above the tube bundle, and the water spraying system sprays the cooling water downward to the surface of the tube bundle, so that a thin water film is formed on the outer surface of the tube bundle. At the same time, the air is sucked out of the louver by the axial fan, so that the air can sweep the obliquely placed tube bundle from below.
The energy-saving water film air cooler mainly relies on the rapid evaporation of water film on the outer surface of the tube to strengthen the heat transfer outside the tube, so as to soften the water in the cooling tube. This is mainly because water has a relatively high latent heat of vaporization (the latent heat of vaporization of water in one atmosphere is 570kcal/kg), which greatly improves the overall heat transfer efficiency.
When the equipment is running, the evaporation of the water film on the outer surface of the pipeline makes the humidity of the air increase greatly after passing through the tube bundle, which is close to saturation. The axial fan sucks wet air and makes it pass through the mist catcher above the water spraying system to remove the water droplets entrained in the wet air, and then it is discharged into the atmosphere from the air outlet.
Because the axial flow fan is located at the upper part of the equipment, a negative pressure zone is formed at the lower part of the axial flow fan when air is sucked upward, which accelerates the evaporation of water film on the outer surface of the pipe, so the heat transfer outside the pipe is strengthened.
In the process of operation, soft water flows in the pipe, air and cooling water are outside the pipe, air flows from bottom to top, spray water flows from top to bottom, cooling water, air and soft water are in cross flow form, and cooling water and air are in countercurrent form. As far as the layout of the whole process is concerned, it also strengthens the process of heat and mass transfer.