Speculations on how long changes in feed composition affect subsequent units
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As the title suggests, everyone has probably encountered changes in the feed components! So how long does it take to affect subsequent units? It can be judged based on experience! Since changes in parameters such as temperature can be roughly determined! It can be determined through online analysis – it’s clear at a glance! So isn’t there any theoretical calculation? ? ? ? ? ? That’s what I think: if we have data on the flow rate at each point, as well as knowledge of the pipe diameter, then it’s possible to calculate the flow velocity. To find out how long the pipe is, it’s enough to measure it once with a tape measure! It was resolved in the pipeline, but what about inside the tower and reactor? Is the gas velocity in an empty tower relevant? There’s also the backflow issue, and the effect of bed resistance; it seems there are many uncertain factors, so it’s impossible to do the calculations at this point! Is it really impossible to calculate? ? ? ? ? ? Is there a theoretical approach? ? For example, if we feed too much methanol, how long will it take for it to come out of the reaction tower? ? ? ?
With the flow rates at various points known from the tables, and the pipe diameter known, the flow velocity can be calculated. To find out how long the pipe is, it’s enough to measure it once with a tape measure; theoretically, that’s sufficient
I haven’t calculated it, and there’s no way to calculate it. Based on practical experience, it takes about two hours for the effects to become apparent in two adjacent towers.
I have some statistics, which are photos showing various trends; I’ll organize them and post them soon