The condenser is easy to form scale in the pipeline after long-term use. If not treated in time, this fouling will affect the heat exchange effect, leading to an increase in the condensing temperature of the unit, thereby reducing the cooling capacity of the unit and increasing the power consumption of the unit. Therefore, the condenser should be cleaned frequently.
1. Mechanical descaling method: The mechanical descaling method is a method of descaling the steel cooling tube condenser with a flexible shaft tube cleaner, which is especially suitable for vertical shell and tube condensers.
The operation method is:
1. Remove the refrigerant from the condenser.
2. Close all valves connecting the condenser and the refrigeration system.
3. The condenser cooling water supply is normal.
4. The bevel gear scraper and the flexible shaft tube gasket perform rotating roller scraping and descaling. The heat generated by the friction between the riser condenser and the cooling scraper from top to bottom and the pipe wall help to circulate the cooling water and refresh it. Wash the scale, rust, and other dirt into the pool.
In the descaling process, a hob with a suitable diameter should be selected according to the descaling thickness of the condenser, the degree of corrosion of the tube wall, and the length of service life. However, the diameter of the hob selected for the first descaling should be appropriately smaller than the inner diameter of the cooling pipe to prevent damage to the pipe wall, and then a hob close to the inner diameter of the cooling pipe is selected for the secondary descaling. These two descaling operations can remove the condenser 95 % Of scale and rust scale.
The mechanical descaling method uses the bevel gear hob to rotate in the cooling pipe, and the hob rotates and vibrates during the feeding process to remove the scale, dirt, and rust in the condenser cooling pipe. After the descaling is completed, all the water in the condensate tank is pumped out, the scale, rust, and other dirt that have been removed from the bottom of the tank are cleaned, and water is filled again.
2. Chemical pickling and descaling method: Clean the condenser with the formulated weak acid descaling agent to make the scale fall off and improve the heat transfer efficiency of the condenser.
The operation method is:
1. Prepare the descaling liquid in the pickling tank, start the pickling pump, and make the descaling liquid circulate in the condenser for 24 hours. Generally, after 24 hours, the scale is basically removed.
2. After stopping the pickling pump, use a round steel brush to brush back and forth on the condenser tube wall, and rinse off the scale and rust with clean water.
3. Use clean water to repeatedly clean the remaining detergent solution in the pipeline until it is clean. The chemical pickling method is suitable for vertical and horizontal shell and tube condensers.
3. Electronic magnetic 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 the state of positive and negative ions at room temperature.
When the cooling water flows through the transverse magnetic field of the magnetic water heater at a certain speed, the dissolved calcium and magnesium plasma obtains induced electric energy, changes its charge state, disturbs and destroys the electrostatic attraction between ions, changes its crystallization conditions, and loose crystal structure. Reduce the tensile and compressive capacity, can not form strong adhesion, and the loose sludge is discharged with the flow of cooling water.
This descaling method can not only effectively prevent the generation of a new scale, but also remove the original scale because after using the electronic magnetic water device, the ion loses its ability to form scale and loses its protective effect on the original scale. In addition, the magnetized cooling water has a certain amount of induced electric energy. At the same time, due to the different expansion coefficients between the steel pipe and the scale in the condenser, the original scale gradually cracks, and the magnetized water continues to invade the cracks, destroying the adhesion of the original scale, causing it to gradually loosen and fall off by itself. It is constantly taken away by circulating cooling water.
The descaling method of the electromagnetic water device is simple and easy to implement, and the labor intensity is low, and the descaling and anti-scaling are performed without affecting the normal operation of the refrigeration system.
The significance of descaling and energy saving:
Once the condenser becomes fouled, the thermal resistance will increase, the thermal resistance will increase, and the heat transfer coefficient will decrease. Since the condensing temperature is inversely proportional to the heat transfer coefficient, the condenser temperature rises and the condensing pressure increases accordingly. The more serious the fouling of the condenser, the more obvious the increase in condensing pressure, which increases the power consumption of the refrigerator, and the power consumption of the operating equipment of the refrigeration system also increases correspondingly, resulting in a waste of electrical energy.
