How to remove the scale of shell and tube condenser in low temperature refrigerator

After using the cryogenic refrigerator for a long time, users need to pay attention to the maintenance of various parts, especially the scaling problem of the shell and tube condenser If it is not solved in time, these scaling will affect the cooling problem of the cryogenic refrigerator, so the scale of the shell and tube condenser of the cryogenic refrigerator needs to be removed in time Generally speaking, there are three ways to remove the scale in the ultra-low temperature condenser of low-temperature refrigerator: mechanical scale removal, chemical acid pickling scale removal and electronic magnetic water device scale removal The ultra-low temperature mechanical scale removal of low-temperature refrigerator is a method to remove the scale in the condenser of the cooling pipe by using the flexible shaft tube washer, which is especially suitable for the vertical shell tube condenser The specific operation is to extract the refrigerant from the condenser first, then close all the valves connected with the refrigeration system to ensure the normal supply of cooling water to the condenser, and then use the bevel gear scraper connected with the flexible shaft pipe washer to carry out rotating and rolling descaling from top to bottom in the vertical tube of the condenser, and use the circulating cooling water to cool the heat generated by the friction between the scraper and the tube wall At the same time, clean the scale, rust and other dirt into the water tank In order to avoid damage to the tube wall and the failure of ultra-low temperature refrigerator, it is necessary to pay attention to the cleaning of the ultra-low temperature shell and tube condenser Secondly, the chemical acid cleaning method is to clean the ultra-low temperature condenser of low temperature refrigerator with the prepared weak acid detergent, so as to make the scale fall off and improve the heat transfer efficiency of the condenser First, prepare the descaling solution in the acid cleaning tank, start the acid cleaning pump, so that the detergent solution circulates in the condenser's condenser tube for 24 hours, and then, in general, 24 hours After hours, the scale is basically removed, and then the pickling pump is stopped, the round steel brush is used to pull the brush back and forth in the tube wall of the condenser, and the scale and rust are cleaned with clean water, and then the detergent solution remaining in the tube is repeatedly cleaned with clean water until it is completely cleaned The chemical acid cleaning method is applicable to vertical and horizontal shell and tube condensers How to remove the scale of shell and tube condenser in low temperature refrigerator In the method, there is also the electronic magnetic water descaling method, which dissolves the calcium, magnesium and other salts in the cooling water flowing through the condenser in the state of positive and negative ions in the water at room temperature, which can effectively prevent the generation of new scale, and can also remove the original scale At the same time, due to the different expansion coefficient of the steel pipe and scale in the condenser, the original scale gradually cracks, and the magnetized water does not The intermittent invasion into the cracks destroys the adhesion of the original scale, makes it loose gradually, falls off by itself and is taken away by the circulating cooling water Once there is scale in the ultra-low temperature condenser of the low-temperature refrigerator, the heat conduction resistance will continue to increase, resulting in the continuous reduction of the heat transfer coefficient value, which makes the refrigeration effect worse and worse Therefore, once there is scale in the condenser, it is necessary to timely check and remove the scale.