Understanding of cross-flow and counter-flow cooling towers

Release Time:2021-07-20


First of all, let's understand what is a cross-flow cooling tower.
The main way to distinguish the cross-flow cooling tower from the counter-flow cooling tower is the direction in which the wind enters the cooling tower. Then the inlet wind direction of the cross-flow cooling tower is to enter in a horizontal direction through the side and present a certain angle with the falling water. Therefore, the cross-flow cooling tower can use either closed cooling design or open system design. The cross-flow inlet wind mode is not the main condition to distinguish open or closed.


1. Introduction of open cross-flow cooling tower:
The open cross-flow cooling tower is of square design. The shell is made of glass fiber reinforced plastic. The air inlet is supplied to both sides. The heat dissipation material designed for the air inlets on both sides is cooling tower packing. The packing is designed on both sides. The middle is empty and is the maintenance space. A large fan is designed on the top of the middle of the cooling tower. The other two sides are glass steel plates. The spray system is designed to spray on both sides to directly spray hot water to the surface on both sides, then heat exchange with the inlet air on both sides, and finally the evaporated hot water is discharged through the fan at the top of the middle.


2. Introduction of closed cross-flow cooling tower:
The cross-flow closed cooling tower is also of square design, and the outer shell is made of metal stainless steel plate or aluminized zinc plate. The air inlet mode is one-sided air inlet, and the air inlet direction is also horizontal air inlet. The cooling and heat dissipation materials designed for the tuyere are condenser and filler, the upper layer is condenser, the lower layer is packing, and a plurality of small fans are designed on the top of the other side.


3. District cooling towers of open cross-flow cooling towers and closed cross-flow cooling towers:
The difference between heat dissipation: open cooling tower is mainly filler heat dissipation, closed cooling tower is the use of condenser heat exchange, filler heat dissipation two.
The material difference: open system is the use of glass steel material, and closed system is the use of sheet metal.
③ Air inlet difference: the open system is the air inlet on both sides, and the closed system is the air inlet on one side.
The difference between the extension: the open system is designed with a large extension in the middle, while the closed type is designed with multiple small fans, on the top of the other side of the air inlet.
The counterflow cooling tower is the water in the tower packing, the water in the tower from top to bottom, and the air in the tower flows back from bottom to top. This is the counterflow cooling tower and the application process of the counterflow cooling tower.


Three stages of the cooling tower.
1. The water distributor is sent to the top of the packing in the tower. Because the water temperature of the cooling tower is relatively high, it can continue to transfer heat to the air.
2. The packing water at the top of the tower is exchanged with the hot gas at the bottom, commonly known as the countercurrent section.
3. When the filling reaches the bottom of the collection pool, hot water will be cooled into cold water. The cooling tower of counterflow type is more efficient than that of cross flow type.


Advantages of counterflow cooling towers.
1. The whole set of equipment is simple in design, the water distribution system is unobstructed, the whole water distribution process does not need special requirements, and it is not easy to be blocked. Water drenching filler is used to prevent aging and moisture backflow. In places with relatively low temperature, it is easy to take anti-freezing measures, and multiple cooling towers can be designed to be used at the same time.
2. The design of the whole set of equipment is relatively simple, the operation is relatively simple, the production cost of the whole set of equipment can be controlled, and it is usually used in some large-scale cooling circulating water.
Shandong Xingheng Environmental Technology Group Co., Ltd. is located in Luquantun Development Zone, Dezhou, Shandong Province, the hometown of glass fiber reinforced plastic in China. The company has three-level qualification for construction mechanical and electrical installation engineering, three-level qualification for environmental protection engineering, and safety production license. It is the first in the industry to pass ISO9001 quality management system certification, ISO14001 environmental management system certification, OHSAS18001 occupational health management system certification, an axial fan invention patent, a fan utility model patent, EIA, three at the same time and other procedures are complete.

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