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Circular cooling tower
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Circular cooling tower
"Cooling tower" refers to a device that can cool water. The water exchanges heat and mass with the air flowing through it, causing the water temperature to drop.
Open cooling tower is a kind of equipment that uses the contact of water and air to dissipate the waste heat generated in industry or refrigeration and air conditioning through evaporation. The basic principle is: after the dry (low enthalpy) air is pumped by the fan, it enters the cooling tower from the air inlet network; the high-temperature water molecules with high saturated steam partial pressure flow to the air with low pressure, and the damp heat (high enthalpy value) The water self-seeding water system is sprinkled into the tower. When water droplets contact with air, on the one hand, due to the direct heat transfer of air and water contact, on the other hand, due to the pressure difference between the surface of water vapor and air, evaporation phenomenon occurs under the action of pressure, that is, the sensible heat of water is taken away by heat transfer with unsaturated dry air, and part of water evaporates to take away the latent heat of water, thus achieving the purpose of cooling water.
The closed cooling tower uses water to contact the coil, and takes away the heat of the cooling medium in the coil through the heat transfer and heat exchange of the tube wall to achieve the cooling purpose. The circulating water in the closed cooling tower only circulates inside the cooling tower and exchanges heat with air for cooling, then contacts with the coil to take away the heat of the working medium in the coil, and the water supplement pipe properly supplements water. Compared with the open cooling tower, the most obvious feature of the closed cooling tower is to increase the coil. The liquid working medium to be cooled flows in the steel coil without direct contact with water and exchanges heat through the pipe wall.
English name: FRP cooling tower FRP cooling tower cooling tower FRP maintenance structure cooling tower design meteorological conditions atmospheric pressure: P = 99.4 × 103 kPa
Dry bulb temperature: θ = 31.5 ℃
Wet bulb temperature: τ = 28 ℃ (27 ℃ for square and ordinary type)
Standard type: inlet water temperature 37 ℃, outlet water temperature 32 ℃
Medium temperature type: inlet water temperature 43 ℃, outlet water temperature 33 ℃
High temperature type: inlet water temperature 60 ℃, outlet water temperature 35 ℃
Common type: inlet water temperature 37 ℃, outlet water temperature 32 ℃
Large tower: the water temperature into the tower 42 ℃, the water temperature out of the tower 32 ℃ industrial, so that hot water cooling equipment. Water is transported to the tower, so that the water and air between the heat exchange, or heat, mass exchange, in order to achieve the purpose of reducing the water temperature.
Scope of application
Waste heat generated in industrial production or refrigeration processes is generally conducted away with cooling water. The role of the cooling tower is to carry out heat exchange between the cooling water with waste heat in the tower and the air, so that the waste heat is transferred to the air and dispersed into the atmosphere. For example, in a thermal power plant, the boiler heats water into high-temperature and high-pressure steam, and drives the steam turbine to do work to make the generator generate electricity. The waste steam after the steam turbine is discharged into the condenser, exchanges heat with the cooling water, and condenses into water, and then pumps it back to the boiler for recycling. In this process, the waste heat of the exhaust steam is transferred to the cooling water, which increases the water temperature. The cooling water carrying the waste heat is transferred to the air in the cooling tower and discharged into the atmospheric environment from the air duct. Cooling tower application scope: mainly used in air conditioning cooling system, refrigeration series, injection molding, leather, foaming, power generation, steam turbine, aluminum profile processing, air compressor, industrial water cooling and other fields, the most widely used for air conditioning cooling, refrigeration, plastic chemical industry.
Working principle
The automatic rotating atomizing cooling tower achieves the purpose of reducing the water temperature by taking away the latent heat of gasification through the heat conduction of circulating cooling water and cold and dry air and the evaporation of circulating cooling water. Circulating cooling water with a certain pressure enters the cooling tower through the inlet pipe. Under the action of the swirl jet of the atomizer, it is atomized into mist with a diameter of 0.1mm and sprayed toward the top of the tower. The reverse thrust generated by the spray drives the automatic rotation The device rotates, causing the atomized water to fill the entire tower body. The axial flow fan installed on the top of the tower rotates to forcibly suck the cold and dry air from the surrounding environment into the cooling tower through the air inlet window for mass transfer and heat transfer with the circulating cooling water. The atomized water flow rate sprayed by the atomizer is very fast, and has the functions of entrainment and entrainment, so that a certain negative pressure is generated around the atomizer, the air extraction volume and air inlet flow rate of the cooling tower from the surrounding environment are increased, and the bottom air is driven to flow upward, resulting in the mixing and contact of cold and dry air with water mist more fully (air-water ratio can reach about 1.2). The particles of atomized water flow are further refined and the diameter can be reduced to 0.01mm, the mist flow after the air and water are fully mixed is sprayed upward to the water collector installed on the top of the tower, the water is trapped and returned to the cooling tower in the form of a water curtain, and the heat in the air and water is discharged out of the tower through the water collector.
It can be seen from the above working process that the circulating cooling water has three processes of rising, suspension and falling in the cooling tower. At the same time, cooling also has two processes of concurrent cooling and countercurrent cooling, so the contact time with cold and dry air is longer and more sufficient, and more heat is taken away. At the same time, due to the cancellation of the filler, the phenomenon of air resistance does not exist, which reduces the power of the motor that drives the fan to rotate, and achieves the effect of reducing operating costs and increasing the difference between the inlet and outlet water temperatures. In addition, the contact area of water and air after atomization far exceeds the contact area of water and air in the filled cooling tower. Based on these points, the atomization cooling tower has higher heat exchange efficiency, the motor power fan model is smaller, and the energy saving effect is more obvious.
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