Circulating water is the water from the cooling tower.
1. The function of the cooling tower
The cooling tower is a structure used by power plants to cool water. The general height is determined according to the size of the power plant’s units. It is used by the power plant to save water and recycle water. A structure. The working principle of the cooling tower: The incoming wind and the water sprinkled from above are used to form convection to drain away the heat source. Part of the water evaporates in the convection, taking away the corresponding latent heat of evaporation. thereby lowering the temperature of the water.
2. Cooling water towers can be divided into two types and their working principles
1. The cooling principle of the open cooling tower is to spray circulating water onto the glass fiber On the packing, heat exchange is achieved through the contact between water and air, and then a fan drives the air flow in the tower to circulate, taking out the hot air flow after exchanging heat with the water, thereby achieving cooling.
With this cooling method, the initial investment is relatively small, but the operating costs are high (water consumption, electricity consumption).
2. The cooling principle of a closed cooling tower is simply two cycles: an internal cycle and an external cycle. There is no filler, and the main core part is a copper tube surface cooler.
①Internal circulation: Connected with the target equipment to form a closed circulation system (the circulation medium is soft water). Cools the target equipment and takes out the heat from the target equipment to the cooling unit.
②External circulation: In the cooling tower, it cools the cooling tower itself. It does not come into contact with the internal circulating water, but only conducts heat exchange and dissipation through the copper tube surface cooler in the cooling tower. In this cooling method, the operation of the motor is set according to the water temperature through automatic control.
Two cycles, when the ambient temperature is high in spring and summer, two cycles need to run at the same time. In autumn and winter, the ambient temperature is not high, and in most cases only one internal cycle is needed.
The most notable feature of the cooling tower is that it requires no electricity and the fan rotates automatically, saving 100% of electricity and 80% of water.
The packed cooling tower evenly distributes the circulating cooling water that needs to be cooled onto the packing. The axial flow fan installed on the top of the tower is driven by a motor to suck the cold air from the surrounding environment into the tower. It conducts mass and heat transfer with hot water on the surface of the filler to achieve the purpose of lowering the water temperature. This kind of cooling tower has a small contact area between water and air, large air resistance of the filler, high noise, relatively large energy consumption, high failure rate, large amount of maintenance, high maintenance costs, short service life, high requirements for water quality, and cooling The effect is not ideal.
The cooling tower is a new product that saves energy and reduces consumption, and is a new technological revolution in the circulating water refrigeration industry. It uses the company's patented invention - the water jet driven fan rotating atomization device to replace the filler, water distribution device, motor and fan on the top of the tower in the packed cooling tower. Powered by the water pressure existing in the circulating water system, the reverse thrust of the water spray atomization device is used to drive the fan to rotate automatically. Therefore, no electricity is required, saving 100% of electricity, and saving the cables and power distribution cabinets required to control the electric fan. , control cabinet, etc. costs.
Compared with packed cooling towers, cooling water towers also have the following incomparable advantages:
1. Small water drift rate: the spray devices are evenly distributed in the tower, and the air outlet area is larger than The air outlet of a traditional mechanical tower is about twice as large, so the air outlet speed is small. At the same time, a water collection device with excellent performance is installed on the top of the tower, which minimizes the amount of floating water and eliminates the need for a large amount of water replenishment. It saves more than 80% of water than a packed cooling tower. While saving water, it also eliminates safety risks for northern users caused by freezing of the surrounding environment of the cooling tower caused by drifting water in winter.
2. Good cooling effect: The hot water in the tower exchanges heat with the incoming air under mist conditions. Since the wind resistance in the tower is very small, coupled with the reasonable design of the air duct and blades, the air-water ratio is Due to reasons such as reasonable wind field in the tower, low steam partial pressure, and less wall flow, the cooling effect of this tower is good.
3. Stable temperature drop: Since this tower uses the jet principle for cooling, there is no filler blockage or fan damage. The advanced water suspension bearing technology ensures that the water jet drives the fan to automatically rotate and the atomization device rotates. Flexible and reliable, it ensures the long-term stable operation of this tower.
4. No special requirements for water quality, strong applicability: Due to the company's patented technology design, the diameter of the atomizing nozzle is Φ10 or more, which is not easy to block. The water flow rate in the nozzle is large and it is difficult to scale. It has no impact on water quality. Special requests. There is no filler, so it is not easy to scale and reduces the possibility of clogging.
5. Silent design, low noise: There are no motors, reducers and other rotating mechanical equipment, which eliminates the disturbing noise of electric fans, so it is especially suitable for hotels, restaurants, hospitals, schools and adjacent residential areas. Enterprises and institutions.
6. Simple operation: As long as the water pump of the circulating water system is working, this product is in working condition.
7. Safe to use and easy to maintain: Because this product has no electric fan, the occurrence of electrical fires during operation is eliminated; it is safer to use in places with special requirements such as flammable and explosive; the structure is simple and easy to use. It is easy to maintain, has low operating costs, and there will be no shutdown accidents caused by fan failure.
8: Wide range of uses and flexible combination: This product has a variety of combination units that can be flexibly combined according to the site. This technology can also be applied to the construction of cooling pools and the transformation of steel-concrete cooling towers.
9. The tower is light in weight: reducing the design requirements for the foundation and installation costs.
10. The cooling water volume of the tower can be adjusted: For a given model of cooling tower, the temperature difference between the inlet and outlet water is generally unchanged when the working water pressure changes (ie, the flow rate changes), so the water supply pressure can be increased. To increase the cooling water volume of the tower (within the allowable range of the spray device), you can also adjust the water volume and temperature drop of the tower by changing the nozzle aperture.
11. No blockage, no maintenance, stable and reliable operation. Completely eliminates the packed tower's impact on the performance of the tower and process system equipment due to impurities in the circulating water blocking the packing and packing aging, deformation, brittleness, water distribution nozzle clogging and washout, packing brittle blocking pipes, pumps and heat exchangers, etc. phenomenon. Completely eliminates the trouble of frequent cleaning, replacement of fillers and water distribution nozzles
3. Characteristics of the cooling tower
The cooling tower is a combination of aerodynamics, thermodynamics, fluidics, chemistry, and biochemistry. , materials science, static and dynamic structural mechanics, processing technology and other disciplines as a comprehensive product. Water quality is a function of multiple variables, and cooling is a comprehensive process of multiple factors, variables, and effects. Cooling towers have different relative flow conditions between water and air. The advantages and disadvantages of different types of cooling towers have been a long-term academic debate in the cooling tower industry. This debate has effectively promoted the development of cooling tower technology, and each has its own share of the debate. Leverage strengths and avoid weaknesses to continuously improve cooling tower technology and make continuous technological progress towards goals such as energy saving, consumption reduction, efficiency improvement, and investment reduction. The thermal performance of cooling towers, noise levels, power consumption, and floating water are the key to measuring the quality of cooling towers. They are the focus of repeated inspections and comparisons by users and designers when selecting cooling towers.