Analysis of the causes of discoloration of tubular heat exchangers tube and preventive measures

Analysis of the causes of discoloration

The discoloration of tubular heat exchangers tube is mainly caused by the high-temperature parts in the tube. The following is a specific analysis of the selection of shell and tube materials, operating temperature control, maintenance and other aspects.

1. Material selection

The material of the tubular heat exchanger tube should be selected from high-quality corrosion-resistant materials, otherwise the surface of the material is susceptible to corrosion, and long-term use will cause the shell and tube to deform and discolor. Currently, commonly used shell and tube materials include stainless steel, copper alloy, nickel alloy, etc. These materials have excellent corrosion resistance and high-temperature oxidation resistance, which can effectively prevent the discoloration of shell and tube materials.

2. Operating temperature control

The operating temperature of the tubular heat exchanger tube should be controlled during use to avoid excessively high temperatures in the tube. High temperature will cause the deposits in the tube to burn, exposing the surface of the shell and tube and causing the shell and tube to discolor. In actual operation, the operating parameters should be strictly controlled to prevent the temperature from being too high. At the same time, some air should be introduced to oxidize the substances in the tube, which can effectively reduce the amount of deposits.

3. Maintenance

Tubular heat exchangers tube also need regular maintenance during use to prevent dirt deposits in the tubes and discoloration of the tube shells. Maintenance includes cleaning, overhauling, replacing key accessories, removing scale in the tube shells and scaling in the tubes, etc., to ensure long-term stable operation of the equipment.

Preventive measures

In order to avoid the discoloration of tube heat exchange tubes, the following preventive measures are recommended:

1. Selectively test the tube shell materials and select corrosion-resistant materials with good corrosion resistance and high-temperature oxidation resistance;

2. Strictly control the operating parameters to prevent the temperature in the tubes from being too high, and introduce air to oxidize the substances in the tubes;

3. Regularly perform maintenance, clean the tube heat exchanger equipment, remove scale in the tube shells and scaling in the tubes, etc.

In summary, discoloration of tube heat exchange tubes is a common problem, but the problem of discoloration of tube heat exchange tubes can be effectively solved by controlling material selection, operating temperature control, maintenance, etc.