How to judge whether the water-cooled chiller is scaling and cleaning method

How to judge whether the water-cooled chiller is scaling and cleaning method

In the production process of the factory, many refrigeration units use water-cooled chillers, and the internal pipe walls of the water-cooled condenser are prone to scale formation. These scales will affect the heat exchange effect and cause the condensing temperature of the unit to increase, which in turn reduces the cooling capacity and the power consumption of the unit. increase.

The main reasons for the formation of scale in the condenser of the water-cooled chiller are: the calcium and magnesium ions in the cooling water crystallize and condense in the form of salt when heated and condense on the inner wall of the copper pipe; the metal oxidation product of the system pipeline; the stickiness caused by bacteria and algae Mud and so on.

　　 We can open the end cap at one end of the condenser of the water-cooled chiller to check the color of the copper pipe of the water-cooled chiller. The original color of the copper pipe is no longer visible. The scaling is already serious and needs to be cleaned in time.

　　 Condenser cleaning is divided into physical cleaning and chemical cleaning. Physical cleaning generally uses high-pressure water jets to remove the dirt from the condenser copper pipes; if the scale is hard scale, chemical cleaning should be carried out, and the physical method cannot remove the scale. In order to make the condenser work in the optimal state, it is necessary to carry out special chemical treatment on the condenser, remove scale, rust, slime, sterilization and anti-corrosion treatment, and restore it to a clean metal surface.

　　 The correct steps for cleaning the general condenser:

　　1. Close the cooling water inlet and outlet valves of the condenser tightly, connect the anticorrosive pump and the liquid distribution tank with the thermometer pipe, pressure gauge pipe or sewage pipe to make a small circulation system and cycle cleaning.

　　2. Add pickling corrosion inhibitor first. This agent is a special copper corrosion inhibitor, which is attached to the metal inner wall of the condenser to prevent the acid and metal from reacting.

3. Add solid pickling cleaning agent, used to clean the calcium carbonate scale as the main component of the scale. The cleaning agent is a composite solid organic acid, white crystals, non-corrosive to metals, and a weak acid; the amount of cleaning agent is based on the amount of equipment scaling Depends.

　　4. Add mud scale stripper (optional). If the condenser equipment is thicker, you need to add mud scale stripper to promote the product after the scale reaction to dissolve in water quickly and accelerate the deep scale reaction.

　　 5. Add a neutralizing passivator, and after the condenser is chemically cleaned, neutralize the residual acid to prevent oxidation of the metal surface and generate secondary floating rust.