Which is better, double-wall plate or single-wall plate, in terms of production process?
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For reboilers and condensers in cold hydrogenation and distillation processes, which design is better – double-wall or single-wall? In terms of leak detection, a single-wall design allows for the installation of acidity alarm devices on the pipelines to enable prompt emergency response. Is that okay? Please help! Thank you!
Double tube sheets are mainly used in applications where the requirements for leak resistance are extremely high, and where corrosion is not a concern. If subsequent processes allow the installation of an acidity alarm device for early warning before taking action, then there is no need to use a double-sheet plate. In areas where double tube sheets are used, not the slightest leakage is allowed. Double-shell plate manufacturing is very difficult, especially the expansion bonding of the shell-side shell plate; leaks that occur during operation are hard to address. If the expansion joint of the pipe corrodes and leaks, the heat exchanger is essentially unusable.
Thank you! A leak was found in the double tube sheets of the cold hydrogenation reboiler and condenser; detecting it promptly and addressing it right away posed no problem. Once, it was left untreated for 17 hours before being dealt with. (Not even the slightest leakage is allowed in areas where double tube sheets are used)
Of course, a double-tube sheet design is better; if you have plenty of money, a titanium heat exchanger can also be used
The double tube sheet is good, as it allows operations to continue without having to stop immediately to address any issues that arise.
The double tube sheet serves primarily to provide an additional layer of protection for the tube sheet. In polysilicon production, leaks do not necessarily occur at the welds of the tube sheet, and tube ruptures are also quite common. The operation of heat exchangers is generally monitored using parameters such as the conductivity and pH value of the return water or steam condensate. It is required that the pressure on the material side be higher than that on the water or steam side; if this is not the case, a judgment can be made based on whether there are excessive amounts of silica solid particles or metal impurities in the material.
In the polysilicon industry, are there acidity alarm systems installed at the material outlet of the heat exchangers used for cold hydrogenation and distillation? What is the effectiveness of such systems? If they work well, it enables early detection and prompt treatment, while also reducing costs by eliminating the need for double-shell design. I asked if the acidity meter can achieve a precision of 0.01. Please share your thoughts.
Double-shell heat exchangers are expensive, and cracks tend to form in the tubes near the expansion joint of the inner shell. However, with the advancement of welding technology, welds generally do not leak. Most polysilicon companies are replacing double-wall plate heat exchangers with single-wall plate ones.
It is precisely because of the double-shell and plate heat exchanger that we are able to provide you with a processing time of over ten hours. If the single-tube sheet leaks, your tower and bed will be ruined in half an hour.