Coking fractionation tower, gas phase temperature, product quality control
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In my coking fractionation tower, the temperatures of diesel, wax oil, and the oil collection tank are all measured as gas phase temperatures. When these gas phase temperatures are affected by disturbances, they fluctuate significantly, making it difficult to control parameters such as the dry point based on these temperatures. What are the advantages of such a design? Is the gas phase temperature generally measured in the oil collection tank and tower of a fractional distillation column?
Generally, the temperature measurement points on a fractional distillation tower are located below the tray, that is, in the gas phase as mentioned by the original poster. The temperature display is sensitive and accurate. It is also referred to as the liquid-phase temperature measurement point, which is located on the distillation line; for example, thermocouples are installed on the distillation line of diesel. It may not be possible to measure the liquid phase temperature inside the tower, and it is not guaranteed that the liquid phase in the downcomer will submerge the thermocouple.
Sometimes the gas phase temperature is high, causing the dry point to exceed the limit; other times the gas phase temperature is low, yet the dry point still exceeds the limit. It’s difficult to keep this under control