Abstract

The regenerative heat exchanger used in a certain type of chemical and volume system adopts a U-shaped heat exchange tube bundle and shell-and-tube structure. The outside of the tube bundle is tightly wrapped with a thin-walled sleeve to prevent short flow between the outer layer of the tube bundle and the shell. Due to structural limitations, the gap between the tube sheet and the tube sheet cannot be welded and sealed, and there are gaps that cause a certain amount of leakage flow. Excessive leakage flow causes the purified medium returned to the primary system to be turbid and the temperature is too low, which is harmful to the main system. In order to facilitate the operation fault analysis and expert system experience accumulation, the influence of shell side leakage fault on heat transfer capacity of regenerative heat exchanger in chemical and volume control system is analyzed. Through collecting, classifying and extracting the leakage accident data accumulated in the actual operation of the device, the calculation and analysis work is carried out. Furthermore, the analysis results are verified on the special combined test bench of regenerative and non-regenerative heat exchanger, and the influence degree and variation law of different leakage flow on the outlet water temperature of tube side and shell side are obtained.

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