How to deal with the scaling problem of the closed circuit cooling tower

Jiangsu Yunuo Cooling Technology Co., Ltd. will introduce to you in detail how to deal with the scaling problem of the closed cooling tower:

closed cooling tower

The closed cooling tower is fouled, what should I do?

1. The reason for the scaling of the supersaturated solution of insoluble salts in the spray water is not only the concentration of salts in the circulating water, but also the partial concentration of the salts on the surface of the heat transfer tubes of the heat exchanger and the increase of the pH value of the water temperature and temperature. The solubility of dissolved salts is a primary factor, and the formation of partially supersaturated solutions has an important relationship with the actual occurrence of scale damage.

Second, the closed cooling tower manufacturer first considers the method to prevent the occurrence of scale damage in the cooling water system by not generating a supersaturated solution of scale components. Among such methods, there are the method of using make-up water with low salt concentration, and the method of operating the cooling water system at a low concentration ratio, and the so-called acid addition method of injecting acid into the circulating cooling water to keep the pH value around 7. The former approach has some difficulties due to recent demands for water conservation and the use of water with a high salt content in the rational use of water. The latter method is a useful way to prevent scale formation. This is because the cooling water pH value is higher than 7.5 and there will be a lot of scaling. The effect of adding acid to adjust pH value on the scaling of CaCO3 on the heat transfer surface.

3. The circulating working water of the closed cooling tower descaling is in thermal communication with the air and the spray water in the tortuous coil array. The long-term closed-circuit circulation causes the impurities in the water to not be discharged, and the reduction of the water volume accelerates the increase of the concentration of impurities. High process, high temperature ring culture breeds many microorganisms. The occurrence and opening of these original problems will inevitably lead to scaling inside the coil, so that weak acid substances will occur, and the tube body and waterway will be corroded.

Fourth, in the clean state of the closed cooling tower descaling coil, the transmitted heat can directly communicate with the air and water, with good heat dissipation effect and high cooling efficiency. Assuming there is scale inside and outside the coil, the heat needs to penetrate

The scale is passed through, and then transmitted to the air and water, and the heat transfer power of the scale is very low, and the presence of scale in a sheet will seriously affect the heat dissipation function of the closed cooling tower, resulting in the closed cooling tower failing to achieve the efficiency of heat dissipation and cooling.

Fifth, although the closed cooling tower has many advantages, the cost of this kind of equipment is relatively high. This makes some closed-circuit cooling tower companies fail to consider the required design margin in the selection and planning in order to reduce the cost of manufacturing, making the closed-circuit cooling tower equipment unable to cope with the test of high temperature climate, and finally the actual outlet temperature of cooling water is far Low dry process requirements.

closed cooling tower

Sixth, if the majority of owners and friends encounter this situation, our company advocates the following improvement measures:

1. Improve the ventilation environment to ensure smooth ventilation near the closed cooling tower, prevent the recirculation of hot air, and ensure uniform air volume.

2. Within the rated current range of the fan, adjust the blade angle of the fan to improve the problem of lack of air volume.

3. Adhere to the cleanliness of the air inlet of the closed cooling tower, and there should be no blockage of the air inlet network.

4. Sort out the blockage of the heat dissipation coil, clean the heat dissipation coil regularly, prevent the occurrence of scaling of the heat exchange coil, and enhance the heat exchange capacity of the coil.

5. The amount of circulating water to be dispatched must not exceed the planning target

6. If there is dirt and algae in the water pan, it should be removed in time to prevent the heat exchange coil from scaling.

The above is the whole content introduced by Jiangsu Yunuo Cooling Technology Co., Ltd. on how to deal with the scaling problem of the closed cooling tower. If you have any questions, please feel free to come and consult!