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How to prevent graphite heat exchanger corrosion
Release time:
2022-05-07
First, additives. In order to reduce corrosion, add corrosion inhibitors, scale inhibitors and so on. They can be added to the heat exchange medium under appropriate conditions. For example, the corrosion reaction of the metal surface of the graphite heat exchanger can be controlled by adding chromate to the cooling water of the graphite heat exchanger to form a metal oxide protective film.
There are several ways to prevent graphite heat exchanger corrosion:.
First, additives. In order to reduce corrosion, add corrosion inhibitors, scale inhibitors and so on. Can be added to the heat exchange medium under appropriate conditions. For example, by adding chromate to the cooling water of the graphite heat exchanger to form a metal oxide protective film, the corrosion reaction of the metal surface of the graphite heat exchanger can be controlled.
Second, electrochemical environmental protection. Protection with DC power supply as well as metal material equipment to eliminate the potential difference that causes corrosion. Including negative protection and positive protection.
Third, the use of corrosion-resistant materials or coatings. Made of corrosion-resistant metal or non-metallic materials, or coated with corrosion-resistant materials on the substrate. In this paper, polypropylene is used as an example, combining propylene tubes with shell and tube materials, and a metal layer is coated on the heat transfer plate of the designed graphite heat exchanger.
Fourth, improve the structural design, due to the condenser cooling water tube inlet end surface is prone to impact corrosion (i.e., bubble corrosion), in order to prevent the surface of the copper tube cover and stress corrosion cracks, in the copper tube on the increase of polyethylene shell. The structural design of the graphite heat exchanger should try to avoid stress concentration.
Fifth, is to control the operating conditions. Ensure that the graphite heat exchanger in reasonable operating conditions, to avoid corrosion caused by the design of the working environment is too large, resulting in elevated temperatures or excessive flow.
Pay attention to cleaning graphite heat exchanger temperature environment changes. Backwashing, chemical or mechanical cleaning should be carried out according to the working environment of the graphite heat exchanger, depending on the scaling, sediment clogging and microbial reproduction in the graphite heat exchanger.
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