Dry burning of heat exchanger
Thread Content
Our factory originally designed the desalinated water heat exchanger, with desalinated water flowing through the shell side; the inlet temperature is 40°C and the outlet temperature is 95°C. The process gas flows through the tube side; the inlet temperature of the process gas is 160°C, and the outlet temperature is 150°C. Now close the inlet and outlet valves for desalinated water in the shell side of the heat exchanger; the desalinated water will flow through the bypass ； Process gas at 180°C is used for direct dry heating of the heat exchanger; what damage might this cause to the heat exchanger?
The original design was a demineralized water heat exchanger; the material for such a heat exchanger should be stainless steel, right? If it is stainless steel, 160 degrees for the process gas is no problem. It is best to open the outlet valve on the shell side of the heat exchanger to prevent pressure buildup in the heat exchanger.
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Was the one-sided operating stress calculated during the design? It’s better if not, especially those with fixed tube sheets
1. What is process gas? Is it steam or distilled gas that requires energy-saving improvements? 2. The heat exchanger should have a design temperature… it’s necessary to check whether that temperature can handle the conditions. 3. If the saltwater on the shell side can be drained, then it’s just simple process gas flowing through… basically no issues. But if there’s no drainage, will the residual saltwater inside vaporize when heated to 160%? If so, the risks associated with volume expansion need to be considered… 4. Safety valves should be installed on both the shell side and the tube side for protection… These are my suggestions