Benfield decarbonization issue
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Our system uses the Benfey potassium-alkali method for decarburization, featuring two-stage absorption and dual-tower regeneration. Recently, the low-pressure regeneration tower has been shaking significantly during normal operation; the shaking is not continuous, as it varies in intensity from time to time, and we are not sure of the reason for this. Have users who use the same process seen this phenomenon? How to solve it?
Is it caused by an excessively high regeneration temperature, which leads to the rapid release of CO2 from the KHCO3 in the regeneration liquid, resulting in excessive pressure fluctuations?
The regeneration tower should be a device that operates at atmospheric pressure; any shaking indicates that pressure is being generated. It is possible to check whether the pressure of carbon dioxide at the outlet of the regeneration tower is higher than usual, which could indicate a leak in the reboiler, allowing process gas to enter the regeneration tower. For example, an increase in the hydrogen content may not be removed, and it ends up being discharged along with the carbon dioxide. It is possible to analyze the gas composition at the outlet of the regeneration tower.
It may be caused by damage to the solution distributor or tray; keep an eye on it. Here, the flash tank shakes due to high liquid levels.