The ethylene problem
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I have two questions. 1. When regenerating the hydrogen dryer, the hydrogen valve was accidentally opened. What is the reason for this sudden drop in pressure at the outlet of the pyrolysis gas compressor? This can lead to negative pressure in one of the cylinders. To be more specific, I’m a beginner; thank you. 2. During the hydrogenation of the whole fraction, the operating pressure in the deethanizer is relatively high, approaching critical values, which makes operation difficult and unstable. Why is it said that full-range hydrogenation increases the operating pressure of the deethanizer? Thank you.
1: The regenerated gas from the hydrogen dryer outlet enters the gas-liquid separation tank of the regenerator, and then proceeds to the fuel gas system. The pressure in the outlet system of the pyrolysis gas compressor is actually the pressure in the cold box, that is, the pressure of hydrogen. A decrease in hydrogen pressure naturally causes a decrease in the outlet pressure of the pyrolysis gas compressor. 2: In the sequential process, the pressure in the deethanizer is between 20 and 28 KG. The existing heat and cold sources of the facility are utilized; it is only by doing so that the distillation efficiency can be maintained, thereby allowing the current parameters to be established.