Treatment Method for Increasing Water Temperature of Cooling Tower

20-05-2019

Treatment Method for Increasing Water Temperature of Cooling Tower


The cooling water tower generally relies on natural heat dissipation, so the volume and heat dissipation surface area of the cooling water tower should be large enough. If the ambient temperature is too high, the cooling water temperature in the Cooling Tower will be higher if it reaches above 40 C, which reduces the heat transfer capacity and prevents the oil temperature of the coupling from being cold printed. In order to ensure the thermal balance of the coupling, the method of continuously or intermittently supplying cold water to the cooling tower can be adopted.


In order to save water, some units install heat-sensitive valves on the intake pipes of cooling towers. When the cooling water temperature reaches the limit, the heat-sensitive valves act. Open the intake and add cold water with lower temperature to the cooling tower. When the water temperature reaches the requirement, the heat-sensitive valves close and stop the water supply. In this way, the cooling water in the cooling tower can always be guaranteed not to be higher than the set temperature.


The main factor affecting the heat transfer effect is the formation of water film or droplets in the packing in the Cooling Tower, which is in direct contact with the air, and heat and mass transfer occurs simultaneously; heat transfer is due to the temperature difference between water and air, while mass transfer is due to the continuous diffusion of water vapor formed by evaporation of the surface of water into the air, and the vaporization of water into the air at the same time, the heat and mass transfer occurs. The process of water cooling is called evaporative cooling, so the heat emitted by water in the process of evaporative cooling is composed of two parts, namely, contact heat dissipation (conduction and convection) and evaporative heat dissipation.


The main factors affecting the heat transfer effect are: the use of cooling towers is to achieve a certain cooling effect, which mainly depends on the heat sinks, fan air flow, cooling towers using water, as well as good ventilation conditions, installation location also has a certain impact.


(1) Radiator: It is the key component of cooling water tower. Small towers usually adopt PVC sheet hot-pressing or heat-absorbing type. Large towers adopt wood. The main purpose is to make the contact surface between air and water bigger and better without affecting wind resistance. At the same time, the heat exchange rate reaches the maximum. The two parameters of heat sink affecting heat transfer effect are mainly the shape and height of heat sink. Do not damage the radiator, so as to avoid the flow of radiator is not smooth.


(2) Air flow rate of fan: It mainly accelerates air flow in tower, accelerates heat exchange between air and water, and takes away heat. The main factors affecting the wind volume of the fan are the shape of the blade, i.e. the width and length of the blade, the deflection angle of the blade itself, the speed of the blade, the installation angle, the speed and the ratio of the motor to the transmission, etc. In addition, in the case of a certain amount of air, the cooling effect of the same type of tower is better with less cooling water than with larger cooling water. Rotary plate heat exchanger structure and performance cooling tower belongs to heat exchange equipment system. There is no space between water and air, the two medium for heat exchange.


The Cooling Tower will be cooled by air through its water. The heat transfer characteristic is that the heat transfer from water to air does not need to pass through the wall, but in the process of direct contact. Rotary plate heat exchanger has unique product advantages in heat dissipation.


Structure and Performance of Rotary Plate Heat Exchanger:


1. This equipment is suitable for: liquid-liquid, gas-gas, gas-liquid convective heat transfer can be used for steam condensation and liquid evaporation heat transfer, chemical industry, petroleum, medicine, machinery, electricity, light industry and textile industry sectors are optional.


2. The equipment is made of two rolled steel plates, forming two uniform spiral channels. The two heat transfer cutoffs can carry out full counter-flow flow, suitable for small temperature difference heat transfer, easy to recover low-temperature heat sources and accurately control the outlet temperature.


3. The nozzle on the shell is tangential structure, the local resistance is small, the curvature of the spiral passage is uniform, the flow of fluid in the equipment does not have a large reversal, the total resistance is small, so the design flow rate can be improved to have a higher heat transfer capacity.


4. The end face of spiral passage is welded and sealed, with good sealing performance and reliable structure.


5. It's not easy to repair, especially when the inner plate is in trouble. Some factories turn off all the welds at both ends of the equipment and roll up the plate after flattening and repairing welding. It takes too much time to do so. It's very important to choose the spiral plate heat exchanger for corrosion protection.


6. It can't be cleaned mechanically. The production practice proves that the spiral plate heat exchanger is not easy to plug compared with the general tubular heat exchanger. Especially the suspended particulate impurities such as sediment and small shells are not easy to deposit in the spiral channel. The reasons are analyzed. One is that once the deposit of the single channel impurities in the channel forms a circulating flow, it will be increased to wash it out. The other is because of the accident. There is no dead angle in the spiral channel and impurities are easily washed out.


7. Because the spiral passage has fixed distance pillar support passage space, no fibre impurities (cotton yarn, straw stick, leaves, etc.) can be thrown into the heat exchanger.


8. Strictly control the cooling water outlet temperature below the scaling temperature.


9. The common cleaning methods are steam blowing or alkali washing. Steam blowing should be directed to the nozzle and impurities should be blown out of the equipment. Many factories think that this is an effective method.

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