The dry gas contains a high level of C5 compounds
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Recently, the content of C5 components in the dry gas from the catalytic unit has been relatively high. Increasing the amount of lean absorption oil does reduce the C5 content, but it leads to more severe liquid carryover in the downstream process. How should this be adjusted?
It is possible to try adjusting the operating conditions of the absorption tower, such as increasing the condensation reflux at the top of the tower, in order to improve the condensation effect and reduce the content of C5 in the gas. At the same time, the circulation rate and temperature of the absorption oil are optimized to improve the absorption efficiency. If the issue of liquid carried along through the back route persists, it may be necessary to consider repairing or upgrading the equipment, such as adding separation devices, to more effectively remove the liquid that is carried along. .
Dry gas with a high content of C5 is typical of poor-quality dry gas, and such gas is difficult to treat. I wonder if the C2 content in your liquefied gas is high. The treatment methods cannot rely solely on absorption; it is also necessary to analyze and assess the situation in detail. If over-analysis is carried out and only absorption is used, it will lead to a vicious cycle. It becomes clear from this that it is also important to check whether the C2 level in the liquefied gas exceeds the limits. Generally, excessive analysis results in poor absorption, and increased absorption in turn leads to poor analysis. Poor analysis causes an increase in the C2 content in the liquefied gas, which can result in high pressure in the liquefied gas tank, necessitating measures such as venting or recovery. Please give it a try; feel free to discuss any issues that arise
Consider both the absorption effect and the desorption effect together. Which indicators or what operational changes caused this? OP
Currently, the levels of C3 and C4 compounds in the dry gas are on the high side, as is the level of C5 compounds. Increasing the amount of lean absorbent oil used in the reabsorption tower did not lead to any improvement in the C5 levels, and there was severe liquid carryover in the dry gas system, requiring constant liquid removal.
Downscale it, please. Take another look at what I said