Catalyzed dry gas, not dry
Thread Content
When we catalytically sample dry gas, there is always some amount of liquid present, which causes ground contamination during discharge. However, the content of compounds with a carbon chain length of 3 or more in the dry gas is generally below 2%. I’m not sure whether this is due to insufficient absorption, excessive absorption, or an improper balance between absorption and desorption I hope experts can give me some advice!
You mean after drying, right? Check whether the dry gas desulfurization tower is carrying amine liquid.
Hello: I’m referring to dry gas before separation.
:) It’s the same with us; it seems like water – the more it’s discharged, the less there is. I haven’t done any analysis either; I’ll pay attention to it and study it further.
Generally, qualitatively, the temperature at the bottom of the separation tower can only be controlled by using the C2 content in the liquefied gas as a limiting factor, in order to avoid excessive separation. Excessive separation leads to an increased flow rate of the separated gas, which in turn raises the cooling load on the absorption system； Under normal circumstances, the flow rate of the analyzing gas should be controlled so that it does not exceed the flow rate of the dry gas. In fact, the quantitative approach is to include analytical gas and deethanized gasoline in the regular analysis schedule to guide operations.
This post was last edited by 276957697 on 2010-10-6 21:52. Where do you get the dry gas from? Isn’t the dry gas sent back to the reabsorption tower to be reabsorbed using diesel? What is the liquid in the bag? It’s diesel, right?
I think you should remove and wash the reabsorption tower; it’s likely that salt accumulation on the trays (packing) has caused an excessive gas velocity.
Liquid carried in dry gas should be addressed by eliminating the causes of such occurrence. An increase in the amount of rich gas, excessive liquid level control in the absorption tower, and pressure fluctuations in the absorption tower are all factors that lead to liquid being present in dry gas; these issues need to be resolved accordingly! We have had the same problem as well; when sampling, placing an oil waste tank under the sampling port prevents contamination of the floor. The acceptable quality of C3 in the dry gas indicates that the absorption process is working properly; whether the absorption was excessive or not, as moderator feng said, it depends on the C2 content in the stripping tower and the liquefied gas.
Reply to 5# fengdingwen: I would like to ask moderator feng – how can we address the issue where the flow rate of gas undergoing separation cannot be greater than the flow rate of dry gas? If the separation is complete, there will be no C3 and C4 components left in the separated gas; all of the separated gas enters the reabsorption tower and becomes dry gas. At this point, their amounts should be equal. Moreover, since some of the components in the rich gas remain unabsorbed, the amount of separated gas is less than that of the dry gas. If the analysis is excessive, the amount of rich gas decreases, which in turn leads to excessive absorption; it’s hard to determine which is greater or smaller
What tests are performed on deethanized oil? Vapor pressure or a component?
Excessive heat removal from the absorption tower results in a low temperature at the top of the tower (which does not correspond to its pressure); in other words, the temperature of the gas is lower than the saturated temperature, which causes the dry gas to contain liquid!