"Cooling tower" means a device for cooling water. Water exchanges heat and mass with the air it flows through, causing the water temperature to drop.
Open-type cooling tower is a kind of equipment that dissipates waste heat generated in industry or refrigeration air conditioning by the contact of water and air through evaporation. The basic principle is: dry (low enthalpy) air through the fan after the convulsive, from the air inlet network into the cooling tower; Saturated steam is divided into high temperature water molecules with high pressure to flow to the air with low pressure, and wet and hot (high enthalpy value) water self-sowing system is sprinkled into the tower. When water droplets and air contact, on the one hand, due to the direct heat transfer of air and water contact, on the other hand because of the water vapor pressure difference between surface and air has the evaporation under the action of the pressure, namely with unsaturated dry air heat transfer away the sensible heat of water, part of the water evaporation to take away the latent heat in the water, so as to achieve the purpose of cooling water for cooling.
The closed cooling tower uses water and coil to contact, through the heat transfer of the tube wall to exchange the heat of the cooling medium in the coil tube to achieve the cooling goal. Closed cooling tower of circulating water in the cooling tower inner loop only contact with the air heat exchange cooling coil again take plate heat pipe working medium, the filling water pipe hydrating properly, compared to the open type cooling tower, the most obvious characteristics of closed cooling tower is to increase the coil, in need of cooling liquid working medium flow in the steel plate of tube is not direct contact with water, through the wall heat transfer.
Cooling tower Design Meteorological conditions Atmospheric pressure: P=99.4 x 103 kPa
Dry bulb temperature: θ=31.5℃
Wet-bulb temperature: τ=28℃ (square and ordinary type: 27℃)
1. Standard type: inlet tower water temperature 37℃, outlet tower water temperature 32℃
2. Medium temperature type: inlet tower water temperature 43℃, outlet tower water temperature 33℃
3. High temperature type: the water temperature of inlet tower is 60℃, and that of outlet tower is 35℃
4. General type: the water temperature into the tower is 37℃, the water temperature out of the tower is 32℃
5. Large tower: the water temperature into the tower is 42℃, the water temperature out of the tower is 32℃ in the industry, so that the hot water cooling equipment. Water is conveyed into the tower to allow heat exchange, or heat and mass exchange, between water and air to reduce the temperature of the water.
classification
First, according to the ventilation mode, there are natural ventilation cooling tower, mechanical ventilation cooling tower, mixed ventilation cooling tower.
Two, according to the contact mode of hot water and air, there are wet cooling tower, dry cooling tower, dry and wet cooling tower.
Three, according to the flow direction of hot water and air, there are countercurrent cooling tower, cross flow (AC) type cooling tower, mixed flow cooling tower.
Four, according to the use of general air conditioning cooling tower, industrial cooling tower, high temperature cooling tower.
Five, according to the noise level, it is divided into ordinary cooling tower, low noise cooling tower, ultra-low noise cooling tower and ultra-quiet cooling tower.
Other, such as jet flow cooling tower, no fan cooling tower, hyperbolic cooling tower, etc.
Seven, according to the shape of glass fiber reinforced plastic cooling tower is divided into round glass fiber reinforced plastic cooling tower and square glass fiber reinforced plastic cooling tower.
Scope of application
The waste heat generated in the process of industrial production or refrigeration process is generally guided away by cooling water. The function 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 transmitted to the air and dispersed into the atmosphere. For example, in a thermal power plant, the boiler heats the water into high temperature and high pressure steam, and pushes the steam turbine to make the generator generate electricity. The waste steam after the steam turbine works is discharged into the condenser, which is heat exchanged with the cooling water and condensed into water, and then pumped back to the boiler for circulation. In this process, waste heat from the lack of steam is transferred to the cooling water, so that the temperature of the water rises, and the waste heat of the cooling water is transferred to the air in the cooling tower, and discharged into the atmosphere from the air duct. Application scope: mainly used in air conditioning cooling system, refrigeration series, injection molding, leather, foaming, power generation, steam turbine, aluminum processing, air compressor, industrial water cooling and other fields, the most widely used for air conditioning cooling, refrigeration, plastic chemical industry.
Structure form
composition
Glass fiber reinforced plastic cooling tower is composed of cooling tower body, fan assembly, motor assembly, deep water disk, splash device, water distribution device, piping system, support, fasteners between supply parts, sealing gaskets and all necessary parts and materials.
ventilator
The ventilator is usually reinforced concrete hyperbolic rotating shell, which has good structural and hydromechanical properties. The lower edge of the shell is supported on equidistant V-shaped or X-shaped diagonal struts to form the air inlet of the cooling tower. The load of the shell is transmitted to the foundation through the diagonal strut. The foundation is mostly made into a circular foundation with an inclined plane to withstand part of the ring tension transmitted by the inclined pillar, or can be made into a separate single foundation or pile foundation.
The throat diameter of the ventilator is the smallest, and the shell wall is the thinnest when the shell is stable under pressure. Thus, the upward diameter gradually increases to form the airflow outlet diffusion section. The top of the tower is provided with a rigid ring, and the throat is gradually expanded according to the double curve shape. The ventilator can also be made into truncated conical shell or combined conical shell, or polygonal tower tube with steel frame covered with wood or asbestos cement plate. Germany in Schmelhausen nuclear power plant in a 146 meters high dry cooling tower in the use of network cable structure of the tower, outer aluminum protection plate, outer aluminum protection plate, with better seismic and wind resistance performance.
