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Methods for stress corrosion of heat exchanger should be adopted
Sep 10, 2020

1. Eliminate the conditions for chloride ion agglomeration. A new connection structure is adopted for the pipe and tube sheet, and the pipe and tube sheet can also be connected by strength expansion and sealing welding to reduce the agglomeration of chlorine ions. If the conditions permit, the design can be in the heat exchanger shell and tube plate adjacent to the opening and add sewage outlet, through continuous sewage or intermittent sewage to reduce the accumulation of chlorine ions.


2. Improve the expansion process. At present, no matter whether the pipe of heat exchanger is expanded or welded together, the depth of the expanded pipe is less than the full thickness of the tube plate, leaving a gap in the shell side. The strength expansion will reduce the stress corrosion resistance of the pipe. At present, the rubber expanded pipe technology is adopted.


3. Select anti-corrosion coating with good temperature and water resistance, and seal the gap area of the pipeline to eliminate the accumulation condition of chloride ion concentration here.


4. Add insulation casing. The prefabricated high-temperature resistant double-layer concentric sleeve is inserted into the tube head, and the outer end is welded or expanded. In this way, a non-flowing layer can be formed on the heat transfer surface of the tube head, increasing the water evaporation in the cracks of the tube head, reducing the concentration of chlorine ions and reducing the gap corrosion caused by chlorine ions.

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