What to do to stabilize the gasoline fraction containing liquefied gas at the beginning of catalytic operation?
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At the beginning of operation of the catalytic cracking unit, before the first fractionation column was in place, there was a lack of heat source at the bottom of the stabilizer; as a result, the stabilized gasoline did not meet the required standards and had a high vapor pressure. What should be done in such a situation? Sending it to the tank for unqualified products or to the gasoline tank through the unqualified product line is very dangerous, especially if this situation persists for an extended period. I would like to ask the experts: has anyone considered using 1.0 MPa steam as a heat source during the initial phase of operation, and switching to normal steam supply once the first fractionation column is operational and functioning properly? Or perhaps adding another reboiler that uses steam as a heat source – but isn’t that a bit excessive?~~~
Generally, after the fractional distillation of crude gas is successful, the process is switched to a stable mode. Stabilization generally requires adding oil first; once all liquid levels are established, a three-tank circulation should be carried out. Try not to deliver liquefied gas and gasoline. First, carry out a three-column cycle; after removing heat from the oil in the middle stage of distillation, and once heat removal in the stripping column and the stabilizing column is operating properly, then gasoline and liquefied gas can be sent out. Adding a steam reboiler incurs high costs. If the saturated steam pressure is not up to standard, it can be reprocessed.
1. At the beginning of operation, before a single circulation is established in the distillation unit, the absorption–stabilization system operates on a three-tank circulation basis, and there is no need to send gasoline outside； 2. Before starting injection, the middle pipeline is filled with diesel; the heat from the feed oil is used to raise the temperature, which in turn is used to heat the gasoline at the bottom of the stabilizer, serving as a heat source for the reboiler ； 3. By the time of fuel injection, the temperature of the crude oil has risen to >200°C, and the heat released by the diesel is sufficient to meet the requirements of the stabilizer; even the gasoline sent out at this point should meet the standards. So there is no need to provide a steam heat source anymore; this is just my personal opinion for reference only.