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Water cooling condenser cleaning method

2019-10-18

Water cooling condenser cleaning method

 

The condenser is prone to scale formation after long-term use. If it is not disposed of in time, the scale will affect the heat transfer effect, resulting in an increase in the condensing temperature of the unit, which will result in a decrease in cooling capacity and an increase in unit power consumption. Figure. Therefore, the condenser should be frequently cleaned of scale.  There are three main methods for preventing and removing scale: 1. Mechanical descaling method: Mechanical descaling is a method of descaling a condenser of a steel cooling pipe with a soft shaft washer, and is particularly suitable for a vertical shell and tube condenser. The method of operation is: 1. The refrigerant in the condenser is withdrawn. 2. Turn off all valves connected to the condenser and the refrigeration system. 3. The cooling water of the condenser is normally supplied. 4. The umbrella-shaped gear scraper connected by the soft shaft washer is rotated and descaled from top to bottom in the riser of the condenser, and the cooling heat generated by the friction between the scraper and the pipe wall is cooled by the circulating cooling water. Flushed dirt, rust and other dirt are washed into the pool. In the descaling process, according to the fouling thickness of the condenser and the degree of corrosion of the pipe wall and the length of the used pipe, the hob with the appropriate diameter is selected, but the diameter of the hob selected in the first pass descaling is smaller than that of the cooling pipe. The inner diameter should be appropriately small to prevent damage to the pipe wall, and the second round of descaling should be carried out with a hob close to the inner diameter of the cooling pipe. The descaling can remove more than 95% of the scale and rust of the condenser. The method of mechanical descaling is to use the bevel gear-shaped hob to rotate and vibrate the hob during the rotation of the cooling tube, and remove the scale and dirt in the condenser cooling tube, after the descaling is completed. The water in the condensate pool is completely removed, and the dirt, rust and other dirt removed from the bottom of the pool are cleaned and refilled. 2. Chemical pickling and descaling method: The condenser is cleaned with the prepared weakly acidic descaling agent to make the scale fall off and improve the heat transfer efficiency of the condenser. The method of operation is: 1. Prepare the descaling solution in the pickling tank, start the pickling pump, and let the descaling agent solution circulate in the condenser tube for 24 hours. Under normal circumstances, the scale is basically removed after 24 hours. 2. After stopping the pickling pump, use a round steel brush to brush back and forth in the pipe wall of the condenser pipe, and rinse the scale and rust with clean water. 3. Repeat the cleaning of the detergent solution remaining in the tube with clean water until it is completely clean. The chemical pickling and descaling method is suitable for vertical and horizontal shell and tube condensers. 3. Electromagnetic water descaling method: The working principle of the electronic magnetic water device is to dissolve calcium, magnesium and other salts in the cooling water flowing through the condenser in water in a positive and negative ion state at normal temperature. When the cooling water flows through the transverse magnetic field of the magnetic water at a certain speed, the dissolved calcium and magnesium ions receive the induced electric energy, the charge state changes, and the electrostatic attraction between the ions is disturbed and destroyed, thus changing its The crystallization condition makes the structure of the crystal loose, the tensile and compressive resistance is reduced, and the hard scale with strong adhesion cannot be formed, and the loose sludge is discharged with the flow of the cooling water. The descaling method can effectively prevent the generation of new scale, and can also remove the original scale, because the ion loses the scale ability after using the electronic water magnetizer, which loses the protection effect on the original scale. In addition, the magnetized cooling water has a certain amount of inductive electric energy. At the same time, due to the different expansion coefficients of the steel pipe and the scale in the condenser, the original scale gradually cracks, and the magnetized water invades the crack without interruption, destroying The adhesion of the original scale makes it gradually loose and falls off on its own and is continuously taken away by the circulating cooling water. The descaling method of the electronic magnetic water device is simple and easy to operate, has low labor intensity, and performs descaling and prevention of scaling without affecting the normal operation of the refrigeration system. The significance of descaling and energy saving: Once the condenser is scaled, the thermal resistance increases, so the thermal resistance increases, and the heat transfer coefficient value decreases. Because the condensation temperature is inversely proportional to the heat transfer coefficient, the condenser temperature rises and the condensing pressure increases accordingly. And the more serious the fouling of the condenser, the more significantly the condensing pressure is increased, which increases the power consumption of the chiller and causes a corresponding increase in the power consumption of the operating equipment of the refrigeration system, resulting in waste of electrical energy.

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