Countercurrent cooling tower manufacturer: the basic principle of countercurrent cooling tower

Dry (low enthalpy) air is pumped by the fan and enters the cooling tower through the air inlet net. The high temperature water molecules of the saturated steam with high pressure flow to the low pressure air, and the hot and humid (high enthalpy) water is sprinkled into the tower from the water seeding system. When water droplets and air contact, on the one hand due to the direct heat transfer between air and water, on the other hand due to the pressure difference between the water vapor surface and the air, evaporation occurs under the action of pressure, taking away the latent heat of evaporation, taking away the heat in the water, that is, evaporation heat transfer, so as to achieve the purpose of cooling.

Countercurrent cooling tower manufacturer: the working process of the countercurrent cooling tower

Take the working process of the circulating countercurrent cooling tower as an example:

Hot water is pumped into the water seeding system of the cooling tower at a certain pressure from the main machine room through pipes, horizontal throats, curved throats and throats, and the water is evenly spread on the packing through the holes on the water seeding pipe; Dry air with low Han value enters the tower from the bottom into the air net under the action of the fan. When hot water flows through the surface of the packing, it forms a water film and carries out heat exchange with the air. Hot air with high humidity and high Han value is drawn from the top, cooled water drops into the bottom basin, and flows into the main engine through the outlet pipe.

Under normal circumstances, the air entering the tower is dry air, the wet bulb temperature is low, and there is an obvious water molecule concentration difference and kinetic energy pressure difference between water and air. When the fan is running, under the action of static pressure in the tower, the water molecules continue to evaporate into the air and become water vapor molecules, and the average kinetic energy of the remaining water molecules will be reduced, thereby reducing the temperature of the circulating water.

From the above analysis, it can be seen that evaporative cooling is independent of whether the air temperature (often called the dry bulb temperature) is lower or higher than the water temperature. As long as water molecules can continue to evaporate into the air, the water temperature will decrease. However, the evaporation of water into the air does not go on indefinitely.

When the air in contact with water is not saturated, the water molecules continue to evaporate into the air, but when the air at the water-gas contact surface reaches saturation, the water molecules cannot evaporate, but are in a state of dynamic equilibrium. The number of water molecules evaporated is equal to the number of water molecules returned from the air to the water, and the water temperature remains the same. It can be seen that the drier the air in contact with water, the easier it is to evaporate, and the water temperature is also easy to reduce. Countercurrent cooling tower manufacturers: countercurrent cooling tower installation reference

Countercurrent cooling tower manufacturer: countercurrent cooling tower environment selection:

(1) Should avoid in the waterproof channel, easy to reflect the volume of the high wall surface, should be installed on the roof or air flow.

(2) When two or more cooling towers are used together, attention should be paid to the tower spacing.

(3) It should not be installed around the outer wall or in an airtight place, and attention should be paid to the distance between the tower and the outer wall.

(4), should avoid the installation of soot and dust more places to prevent the above blockage.

(5), should be away from the kitchen and boiler room and other hot places.

Countercurrent cooling tower manufacturer: countercurrent cooling tower installation points:

(1) The foundation should be horizontal and not inclined, and the middle line of the cooling tower is perpendicular to the horizontal plane.

(2), the inlet and outlet water pipes of the cooling tower above 175T should be adjusted.

(3) When two or more pumps, a balancing pipe should be added between the two POTS.

(4) The circulating water connection should be connected by the shock absorber throat.

(5) The cooling tower fan blade should be consistent with the gap of the tower wall, and the gap on both sides should not be allowed to be too large, and the problem should be solved in time.

(6), the motor and the reducer should be regularly checked and maintained, and the oil level of the reducer should be checked.