Common faults that occur in low-temperature methanol washing units during normal operation
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What are the common faults that occur in low-temperature methanol washing units during normal operation, and what are the solutions? What are the key aspects of daily maintenance?
Common problems that arise during the routine maintenance of the Lind process are difficulties in controlling the liquid levels and temperatures in the four towers. After major repairs, there is a significant amount of impurities throughout the system; therefore, filters are being cleaned continuously. One of the heat exchangers does not perform well in terms of heat transfer, and this issue is currently being addressed.
Daily maintenance includes starting and stopping the pumps, handling leaks, topping up fluids, and cleaning filters. Here, we have encountered several instances of control valve failures, which were quite urgent situations
The self-regulating valve is stuck, the PID parameters are incorrect, and fluctuations in the high and medium pressure systems affect the low pressure system. Adjustment of the gas generation furnace volume.
Reply to 4# Washing tower: What do PID parameters and high/low pressure mean? Please explain
Improper setting of the valve PID parameters can lead to large fluctuations in the valve’s operation. Fluctuations in the high-pressure system can affect the valves in the low-pressure system.
Fluctuations in the high-pressure system can affect the liquid level in the low-pressure system, leading to large fluctuations in the valves and resulting in system instability. At this point, the control valve of the high-pressure system should be switched to manual mode in order to stabilize the low-pressure system.
During the initial operation period, the liquid level gauges in each tower are prone to clogging, and the liquid level in the ammonia cooler is inaccurate
Pressure, level, and flow rate of each tower； The normal opening degree of the valve prevents failures and false indications ； The most important thing is the handling of emergencies, etc.
Changes in the liquid level of the tower can easily lead to slight excess levels of purified gas, as well as pump switching and filter backwashing.
Regarding the material issue of the five towers, ours has leaked several times already