Help – recently, the methane content in the liquefied gas produced through catalytic stabilization has been consistently high
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Recently, the methane content in the liquefied gas that has been produced through catalytic stabilization has been quite high, reaching 10%, whereas it is lower in other teams. What could be the reasons for this high level, or what factors might cause it to be so high?
The absorption tower absorbs too much, or the desorption tower has poor desorption efficiency.
It’s a problem with the operation. The reasons are as follows: 1. The liquid-to-agent ratio in the absorption tower is high, the temperature of the absorbent entering the tower is low, the temperature inside the tower is low and the pressure is high, resulting in excessive absorption. 2. The temperature inside the stripping tower is low and the pressure is high, which prevents C1 and C2 from being stripped away and causes them to reach the top of the stabilization tower. 3. The temperature at the top of the stabilization tower is low, the operating pressure is high, and the pressure in the reflux tank is also high; as a result, the non-condensable gases cannot be discharged. First, control the pressure in the stabilization tower and increase the discharge of non-condensable gases, then identify the causes based on the above factors.
The parsing effect of the parsing tower is poor. Bring ethane too? It affects the operation of the gas phase.
It’s better to take a closer look at the operating parameters of other teams! It mainly involves absorption and analysis in combination; releasing non-condensable gases from the liquefied gas tank can quickly reduce their concentration. Of course, you should also be skeptical when analyzing.
Compared to the operating parameters of others, there are basically no changes; the temperatures at the bottom of the separation tower as well as the absorption dose, temperature, and pressure are all similar. However, by increasing the temperature at the bottom of the separation tower, the methane level dropped from 10 to 3, which is still not as good as that of others.
During the last night shift, I continued to adjust the operations by reducing the amount of absorbent used; as a result, the temperature at the top of the absorption tower increased. The temperature in the rectification tower was also raised, and the C1 content was 1%, which seems appropriate!