Gas-gas heat exchange – shell and tube heat exchanger with fixed tube sheet; the outlet temperature on the tube side is on the high side
Thread Content
Gas-gas heat exchange – fixed tube sheet shell and tube heat exchanger, with a relatively high outlet temperature on the tube side. For process gases and heat exchange involving process gases, a fixed-tube-sheet shell-and-tube exchanger is used (operating temperature between 100 and 200 degrees Celsius, operating pressure of 20 kilograms). Among the inlet and outlet temperatures on the tube side and the shell side, only the outlet temperature on the tube side is 5 to 6 degrees Celsius higher than the design value; all other temperatures are at the design values, which suggests an imbalance in heat transfer. Please ask the experts to analyze what causes this
Due to the overly brief description provided by the original poster, only speculation is possible (on the assumption that there is no phase change in either component of the gas on either side, and that the thermal balance calculations were done correctly during design): 1. When cold gas flows through the tube side, the outlet temperature tends to be higher than the designed value. This situation may occur if the flow rate of the hot gas is higher than the designed value. As for the impact of gas pressure, even if there are slight errors between theoretical calculations and actual operation, the probability of encountering the situation described by the original poster is very low. 2. When hot gas flows in the tube side and the outlet temperature is higher than the designed value, and pressure factors are not taken into account, this situation may be caused by the flow rate of the hot gas being lower than the designed value. Another possibility, though less likely, is that the temperature of the gas on the shell side is lower than the ambient temperature; as a result, it absorbs heat from the environment, which means that the cold gas involved in the heat exchange does not exchange heat with the hot gas in the tube side to 100% efficiency in actual operation. It is recommended to provide more detailed descriptions of issues in the future to facilitate discussion.
“2. When hot gas flows through the pipe side, the outlet temperature is higher than the designed value; if pressure factors are not taken into account, this situation may be caused by the hot gas flow rate being lower than the designed value... It should be “the 【cold】 gas flow rate being lower than the designed value” rather than that