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What are the characteristics of closed cooling tower

In recent years, the cooling tower has been widely used in iron and steel metallurgy, power electronics, machining, air conditioning systems and other industries. Due to the special requirements of the closed cooling tower itself, a specially made high efficiency water pump with low head and large flow is used, which can maintain a small power consumption under the condition of ensuring sufficient water spray, greatly improving the energy saving effect of the equipment. The water pump motor is designed outdoor, and the protection level meets certain requirements, The water pump adopts mechanical seal, so the wear resistance is very strong. The lowest point of the water pump of the cooling tower is equipped with a drain port to facilitate the shutdown and drainage, and prevent the vortex shell from freezing and cracking due to water storage in winter. The cooling tower has the advantage of corrosion resistance. After fully considering the rust prevention problem, the closed cooling tower adopts galvanized steel materials for the framework, panel and other steel materials, and meets the requirements of low temperature use. Therefore, the cooling tower has good corrosion resistance and rust prevention capabilities. In order to improve the corrosion prevention Low temperature resistance and adaptability under various environmental conditions. The tower body is made of thick galvanized steel to keep the bright primary color of galvanized steel, making the tower body more beautiful and practical. During the operation of the cooling tower, the fluid circulates in the heat source and the coil of the closed cooling tower. It reaches the nozzle through the spray pump and the spray pipe. The warm spray water forms a film on the surface of the packing, which has achieved the best cooling effect. At the same time, the fan system is started, so that a large amount of air outside the unit enters from the air inlet grille in the opposite direction to the falling water, and the air and water directly contact on the surface of the packing. In this evaporation process, the spray water transfers the heat to the air flowing through the unit by means of latent heat exchange, the saturated air flow is transferred to the air through the fan, so as to dissipate the heat, and the rest of the spray water is sprayed to the coil after being cooled by the packing. In this way, the countercurrent filling design is very suitable for winter operation, and the packing part is completely surrounded by the box wall plate, avoiding direct contact with the frozen air flow, This will prevent the packing from freezing and improve the possibility of winter operation.

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How to optimize the structure of closed cooling tower

Now we have studied the structure optimization of closed cooling tower and tubular cooling tower, and learned the influence of structural parameters in tubular area and the energy consumption of fans and pumps. The investigation results show that the width of is within an appropriate range, and the coils have equilateral triangle layout, which can minimize the investment cost and operating cost of closed cooling tower. Closed cooling tower is used for closed cooling tower of air conditioning and refrigeration engineering, and has cooling coils and pipes with nozzles. As the cooling water flows into the cooling coil without direct contact with the air, it can keep the cooling water clean and free of pollution, reduce the impact of dirt and scale on the condenser air and its equipment, and maintain a certain working efficiency. At the bottom of the closed cooling tower, there is a pool for storing circulating water. The water pump lifts the water flowing to the discharge pipe, sprays it onto the outer surface of the cooling coil, and removes some heat to cool the cooling water, And has a great ability to adapt to the environment. At present, the software is used to compile the program of the closed tube cooling tower. Compared with the experimental results, the temperature of cooling water is distributed along the height of the cooling tower in the cooling tower. The writing system is used to use the tube simulation program, and the subsection calculation method is used to predict the temperature of cooling water outlet. Compared with the experimental results, the consistency effect is good. The model can be used to predict different flow velocities, And the outlet water temperature of closed cooling tower under different outdoor air conditions. For air conditioning systems that need to be cooled in transition seasons or throughout the year, it is recommended that when the temperature of the wet bulb in the outdoor environment is lower than the temperature of the system that needs cold water temperature, the cooler should stop working. Evaporative cooling technology is used to directly provide cooling energy saving solutions to the system from the closed cooling tower. Logarithmic average temperature difference method is used to calculate the operating conditions of the system's direct cooling mode. Example analysis shows that closed cooling towers are used, When the main engine is not running, the direct cooling and energy saving effects are obvious, and more equipment investment can be recovered within two years, with good economic benefits.

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Precautions for cooling tower operation

1. The oil level of the reducer shall be checked frequently. It is recommended to use No. 22~28 hyperbolic gear oil or No. 90~120 industrial gear oil as lubricating oil. In summer, oil with high viscosity shall be used. Drain and replace the oil 20 days after the first operation. 2. Before the operation of fans, motors and reducers, they must be checked according to the corresponding product instructions, especially the motor wiring, which should be wired according to the wiring diagram provided by the motor manufacturer. Sometimes, all parties have different opinions, which may cause wiring errors. Start up again after meeting the requirements, starting the sequence from low speed to high speed. After the blade angle is installed according to the value specified in the sample, if the high-speed running current exceeds the rated value, stop the machine immediately and contact the manufacturer quickly. The standard for adjusting the fan blade angle to meet the requirements is: A. Draw a line at the upper and lower edges of each fan blade 150 mm from the air duct to obtain the height difference between the upper point and the lower point Δ H value, per blade Δ The maximum and minimum difference of h value shall not be greater than 2mm; B. The maximum and minimum difference of the elevation value of each blade at the upper edge of the blade 150 mm from the air duct shall not be greater than 0.002R (R is the fan radius); C. The current of the motor is 0.9~0.95 of the rated value at high speed. 3. If the quality of circulating water and make-up water is poor, water quality stabilization measures shall be taken, side filters shall be set, and sterilization and algae killing measures shall be taken when necessary.

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Precautions for replacing cooling tower packing?

The circulating working water of the open cooling tower conducts heat exchange with the air. In the three cooling sections of the spray section, the packing area and the water collecting section, the packing is the main part of the heat exchange, and most of the heat energy of the hot water is distributed in the packing area for cooling. At the air inlet of the cooling tower, there is a row of neat honeycomb shaped plastic sheets, which are the core components of the cooling tower. Precautions for replacing cooling tower packing? As the key component of the FRP cooling tower, the heat sink is usually made of pvc sheet and wood, which are characterized by improving the heat dissipation coefficient of air and water at the contact surface without affecting the wind resistance. The function of the heat sink is to equalize moisture, with small wind resistance and high heat dissipation coefficient. In the internal structure of the glass fiber reinforced plastic cooling tower, the transferred water can be evenly dissipated through the honeycomb cooling fins of the glass fiber reinforced plastic cooling tower. At the same time, the cooling tower is equipped with a fan, which is generally located at the bottom of the glass fiber reinforced plastic cooling tower and constantly blows to the top. The flow direction of high-temperature water is from the top to the bottom. After cooling, the water flows to the bottom outlet and then to the mechanical equipment again. FRP cooling tower is made of FRP material as the shell of the cooling tower.

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