Discussion on the degree of resolution of the analytical tower
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Can the deethanized gasoline resulting from the separation in the separation tower contain C2 compounds, and are there any requirements regarding the amount of such compounds? Does it have an impact on the device’s energy consumption and production? Some units advocate against allowing C2 to enter the stabilizer tower. What are the benefits of doing this? There are rewards for in-depth discussions.
It can be brought; 1-2 units is ideal. Too high a level affects stable operation and causes pressure fluctuations. Low understanding leads to excessive analysis, increased energy consumption; overloading the absorption and analysis towers can also cause fluctuations that result in dry gas carrying liquid, affecting the yield of liquid. Of course, the C1-C2 content in the liquefied gas also affects gas separation operations. It is best not to include it if the design load of the absorption and separation tower is large enough
The energy consumption associated with the C2 stabilizer also increases accordingly; the load at the bottom of the tower must be increased to prevent light components from entering that area, while more cooling capacity is required at the top of the tower to avoid overpressure. LPG carries C2 to the gas separation unit, and the gas separation unit then sends the non-condensables back to the absorption system; this cycle process thus results in corresponding energy consumption.
That’s right; therefore, when the absorption system is not overloaded, it’s best not to carry C1-C2
Therefore, some units recommend not allowing C2 to enter the stabilizer tower. This is relatively more energy-efficient; I’m not sure what other refineries do in this regard, and I’d appreciate any opinions or discussions on the topic. There are rewards for replying.
The separation tower is used for separating C1C2; of course, it cannot have these gases introduced into the stabilization tower. The gases in the stabilization tower are liquefied gases such as C3C4, while C1C2 are non-condensable gases. Their non-condensable nature poses problems, as it can affect the operating pressure； Each goes their own way.
Of course, the amount of C1C2 should be as low as possible; if it does not affect the operation of the stabilizer, the liquefied gas yield can be increased slightly to prevent excessive absorption. There is absolutely no C1C2, ensuring the maximum load at the top of the stabilizer tower.
The C2 component in liquefied gas should be no more than 2%; although the lower this value, the better, it is possible to slightly reduce the temperature at the bottom of the desorption tower provided that the test results are satisfactory, in order to prevent excessive desorption. Of course, the priority remains ensuring that the product quality meets the required standards
Some systems recommend preventing C2 from entering the stabilization system; under full-load operation, the low temperature of the separation tower is set at a fixed value of 102°C and automatic control is activated. Is this the most energy-efficient approach?
Deethanized gasoline contains C2 compounds, and the liquefied gas produced in the stabilizer also has C2 levels. Additionally, an increase in non-condensable gases leads to higher pressure at the top of the stabilizer.