What is the circulating water of power plant used for?
Circulating water is the water of cooling tower. First, the role of cooling tower The cooling tower is a structure used for cooling water in power plants. Generally speaking, the height depends on the size of power plant units. This is a structure for saving and recycling water in power plants. The working principle of the cooling tower: the heat source is discharged by convection between the blowing wind and the water overflowing from it, and part of the water evaporates in the convection, taking away the corresponding latent heat of evaporation. Thereby lowering the temperature of the water. Second, the cooling tower is divided into two types, and its working principle is 1. The cooling principle of open cooling tower is to spray circulating water on the filler of glass fiber in a spraying way, and realize heat exchange through the contact between water and air, and then the fan drives the airflow in the tower to circulate and take out the hot airflow after heat exchange with water, thus realizing cooling. The initial investment of this cooling method is small, but the operating cost (water consumption and electricity consumption) is high. 2. The cooling principle of closed cooling tower is simply two cycles: an internal cycle and an external cycle. There is no filler, and the main core part is the copper tube surface cooler. ① Internal circulation: connected with the target equipment to form a closed circulation system (the circulation medium is soft water). Cooling the target equipment and bringing the heat in the target equipment to the cooling unit. ② External circulation: In the cooling tower, the cooling tower itself is cooled. It does not contact with the internal circulating water phase, but only exchanges heat and dissipates heat through the copper tube surface cooler in the cooling tower. In this cooling mode, the operation of the motor is set according to the water temperature through automatic control. Two cycles, in the case of high ambient temperature in spring and summer, need two cycles to run at the same time. In autumn and winter, the ambient temperature is not high, and in most cases, only one internal circulation is needed. The most remarkable feature of the cooling tower is that it does not need electricity, and the fan rotates automatically, saving electricity 100% and water 80%. The packed cooling tower distributes the circulating cooling water that needs to be cooled evenly on the packing. The axial fan installed at the top of the tower is driven by a motor to suck the cold air from the surrounding environment into the tower, and the cold air and hot water transfer heat on the surface of the packing, so as to reduce the water temperature. This kind of cooling tower has the advantages of small contact area between water and air, high resistance of filler to air, high noise, relatively high energy consumption, high failure rate, large maintenance amount, high maintenance cost, short service life, high requirements for water quality and unsatisfactory cooling effect. Cooling tower is a new product of energy saving and consumption reduction, and it is a new technological revolution in circulating water refrigeration industry. It uses the patent invented by our company-the rotary atomizing device driven by water jet fan to replace the packing, water distribution device and the motor and fan at the top of the packed cooling tower. Based on the water flow pressure in the circulating water system, the fan is driven to rotate automatically by the reverse thrust of the water jet atomizing device, so electricity is not needed, saving 100%, and saving the cost of cables, power distribution cabinets, control cabinets, etc. required for controlling the electric fan. Compared with the packed cooling tower, the cooling tower also has the following incomparable advantages: 1, and the floating rate is low: the spray devices are evenly distributed in the tower, and the air outlet area is about twice that of the traditional mechanical tower, so the air outlet speed is low. At the same time, a water collecting device with excellent performance is installed at the top of the tower, which minimizes floating water and saves a lot of water supplement, saving water by more than 80% compared with the packed cooling tower. At the same time, it saves water, and eliminates the potential safety hazard of freezing around the cooling tower caused by floating water in winter in northern users. 2. Good cooling effect: the hot water in the tower exchanges heat with the inlet air in foggy days. The cooling effect of the tower is good because of the small wind resistance, reasonable design of air duct and blades, high gas-water ratio, reasonable wind field, low steam partial pressure and less wall flow. 3. Stable temperature drop: As the tower is cooled by spraying principle, there will be no packing blockage and fan damage. The advanced water suspension bearing technology ensures the flexible and reliable rotation of the automatic rotary atomizing device driven by water jet and the long-term stable operation of the tower. 4. No special requirements for water quality, strong applicability: due to our company's patented technology, the diameter of atomizing nozzle is above φ 10, which is not easy to block, and the nozzle has fast water flow speed and is not easy to scale, so there is no special requirement for water quality. No filler, not easy to scale, reducing the possibility of blockage. 5, quiet design, low noise: no rotating machinery such as motors and reducers, eliminating the disturbing noise of electric fans, so it is especially suitable for hotels, restaurants, hospitals, schools and enterprises and institutions in neighboring residential areas. 6. Simple operation: As long as the water pump of the circulating water system works, this product is in working condition. 7. Safe use and convenient maintenance: because this product has no electric fan, the occurrence of electrical fire in operation is eliminated; It is safer to use in places with special requirements such as inflammable and explosive; Simple structure, convenient maintenance, low operating cost, and no shutdown accident caused by fan failure. 8. Wide application range and flexible combination: this product has many combination units, which can be flexibly combined according to the site. This technology can also be applied to the construction of cooling pool and the reconstruction of steel-concrete cooling tower. 9. Low tower temperature: It reduces the design requirements and installation cost of the foundation. 10, the cooling water quantity of the tower can be adjusted: for a given type of cooling tower, the working water pressure changes (that is, the flow rate changes), and the temperature difference between inlet and outlet water is basically unchanged, so the cooling water quantity of the tower can be increased by increasing the water supply pressure (within the allowable range of the spray device), and the water quantity and temperature drop of the tower can also be adjusted by changing the nozzle aperture. 1 1, no blockage, no maintenance, stable and reliable operation. Completely eliminated a series of phenomena that affect the performance of packed tower and process system equipment, such as impurities blocking packing in circulating water, aging, deformation, brittle fracture, blocking and falling off of water distribution nozzle, and packing debris blocking pipelines, pumps and heat exchangers. The trouble of frequent cleaning and replacement of fillers and water distribution nozzles is completely eliminated. 3. Characteristics of cooling tower Cooling tower is a comprehensive product integrating aerodynamics, thermodynamics, fluid science, chemistry, biochemistry, material science, static and dynamic structural mechanics, processing technology and other disciplines. Water quality is a multivariate function, and cooling is a multi-factor, multi-variable and multi-effect process. According to the different relative flow conditions of water and air, it is a long-standing academic debate in the cooling tower industry that different types of cooling towers are better or worse. This debate has effectively promoted the development of cooling tower technology, and each has its own advantages and disadvantages in the debate, which has continuously improved the cooling tower technology and made technological progress towards the goals of saving energy, reducing consumption, improving efficiency and reducing investment. The thermal performance, noise, power consumption and floating water quantity of cooling tower are the key to measure the quality of cooling tower, and are the focus of repeated investigation and comparison between users and designers when choosing cooling tower.