Leakage from the floating valve trays in the low-temperature methanol wash unit

The gas flows upward through the liquid via floating valves to the upper tray. The liquid flows over the overflow weir and falls onto the next layer of trays. The main cause of the leakage is that the floating valve is stuck and cannot close.

The liquid passes through the floating valve to the next tray. This may be caused by too low a gas flow rate, too high an opening ratio of the trays, or too high a liquid flow rate.

During normal operation of the float valve tray in low-temperature methanol washing, gas passes upward through the liquid via the float valves to the upper tray. The liquid coming from the upper tray flows down to this tray through the downcomer, where it comes into contact with the gas passing through the various float valves, absorbing substances such as carbon dioxide and hydrogen sulfide. Then it flows over the overflow weir of this tray and goes down to the next tray through the downcomer. If it leaks throughout the night, the leakage occurs from each float valve. The main reason for this leakage is that the float valve gets stuck and cannot close, resulting in leakage from that float valve ； The gas velocity passing through the floating valves is too low (low load), causing leakage from each floating valve ； The float valve is damaged and cannot be closed; it is leaking liquid ； Excessive opening rate of the tray plates, or too high liquid flow rate, causes leakage ； Operation of the tray below the leakage line results in leakage ； Wait.

Gaps at the connection between the floating valve and the tray are also a cause of liquid leakage!