Regarding the operation of oxygen series valves
Thread Content
Last time, I saw a friend ask about the procedure: first, the oxygen valve XV1304 is closed, then XV1303 is closed, and only after that is the nitrogen isolation valve opened. There is a period of time between the closing of XV1303 and the opening of the nitrogen isolation valve during which there is no nitrogen isolation for protection; this is because oxygen might leak in through XV1304 and into the vaporization furnace. There’s no need to worry about this issue. In the gasification furnace’s interlock system, there is an oxygen control valve labeled FV1307. This valve closes simultaneously with XV1304 once the gasification furnace is shut down; in other words, two valves close before XV1303 does, so there’s no possibility of leakage. Please have that person take a close look at their interlock logic diagram
Indeed: the oxygen flow control valve shuts down in interlock. But what I mainly see are parking interlocks from some manufacturers: after parking, the oxygen second shut-off valve closes and before that the nitrogen plug is activated to purge the oxygen pipeline; after the oxygen second shut-off valve closes, a nitrogen plug is automatically formed. Wouldn’t such an approach be more logical from a programming perspective?
Give a like first. The parking interlock action shuts down FV07 and XV04 while opening the nitrogen valves XV06 and XV20; it is more reasonable to shut down XV03 and open XV05 after receiving feedback from XV04 and XV06, or after 10 seconds. During my studies, I earnestly request your guidance. This post was last edited by Tianya Langji on 2008-3-4 10:37.]
Is that the technician from Nanhua upstairs? Last August and September at Nan Chemical*, I gained a lot, and I would like to thank the workers there! During the parking interlock operation at Nanhua, maintaining a low-flow nitrogen flow (300 Nm3/h) in the oxygen pipeline and the central oxygen pipeline after nitrogen purging is also an effective measure to ensure system safety!