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What are the anti - corrosion methods for spiral-plate heat exchanger?
- Apr 22, 2017 -

Spiral plate heat exchanger is a new type of heat exchanger, heat transfer efficiency is good, the operation stability is high, Can work together more than one, can be used for steam - steam, steam - liquid, liquid - liquid, liquid heat transfer. More widely used in food, medicine, chemical, textile, light industry, petroleum, solvent, coking, rolling steel, metallurgy and other industries.

Spiral-plate heat exchanger

Spiral plate heat exchanger

Spiral-plate heat exchanger in industrial production is to regulate the process medium temperature to meet the process requirements and recovery of waste heat to achieve energy saving key equipment, the heat transfer performance and power consumption related to the production efficiency and energy saving level, its weight and Costs determine the investment in the entire production system. Spiral plate heat exchanger is not easy to repair, Some plants remove all the welds at both ends of the equipment to both ends of the equipment weld all off the car again to re-roll the plate after the re-rolling. It is very important to use anti - corrosion of spiral plate heat exchanger. There are currently several anti-corrosion methods:

1.Electrochemical protection method

Electrochemical protection method is divided into cathodic protection and anode protection. Cathodic protection is the use of external DC power supply, so that the anode on the metal surface into a cathode and be protected. This method consumes a lot of electricity, high cost, using very little. The anode protection method is the anode that connects the protected equipment to the external power supply, so that the metal surface to generate passivation film, so as to achieve protection.

2. Corrosion resistant materials

The use of corrosion resistant materials, such as: binocular stainless steel, Hastelloy, titanium, titanium alloy, copperand so on, these materials have strong corrosion resistance, can improve the service life of spiral plate-heat exchanger.

3. Anti-corrosion coating method

On the surface of the metal, through a certain coating method, covering a layer of corrosion-resistant coating protective layer, in order to avoid the metal surface and corrosive media in direct contact. This technique method is the most economical and effective, initially used to prevent corrosion of the gas medium, Most of the coating used is an organic polymer mixture solution. People gradually to the anti-oil and anti-solvent coatings, high temperature coatings, heavy anti-corrosion coatings and special environmental coatings direction.

4. Add the corrosion inhibitor method

In the corrosive medium, the addition of a small amount of certain substances, and these substances can make metal corrosion greatly reduced, or even stop, such substances known as corrosion inhibitor. The addition of corrosion inhibitor should be based on the principle that it does not affect the production process and product quality.

 

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