Overtemperature problem of alcohol tower
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Our company's 15,000-ton combined alcohol system often encounters emergency shutdowns or power outages due to external system or power outages, causing the temperature of the catalyst layer to rise rapidly and exceed the temperature (more than 300 degrees). After the cycle machine is stopped, closing the main valve and opening the cold branch line and the cold shock valve do not work. Please let me know if you guys have any good solutions.
In the event of a power outage or serious equipment accident, press the stop button immediately to stop the circulation machine. Quickly close the inlet and outlet valves and open the shortcut valve. Open the vent valve to relieve pressure, close the cooling water valve, packing air return valve and add ammonia.
After the cycle machine is stopped, the gas does not flow. Even if the main valve is closed and the cold branch line and cold shock valve are opened, it will have no effect. Immediately after parking, release the pressure at the allowed rate, and fill with nitrogen for replacement after reaching a certain pressure. The temperature control of the cold tube type synthesis tower is not as stable as that of the shell and tube type, which is one of its major shortcomings.
At this time, quickly release the pressure, but not too much, maintain the drum liquid level, and charge N80 into the synthesis tower. The compressor can be stopped or not. At this time, the most important thing for the synthesis tower is not to continue to overheat, otherwise the tubes and catalyst will be burned out. Therefore, it is necessary to ensure the circulation of the system and not to form dead air. When you open Lian Chun, you'd better ask your brother units for advice and prepare operating procedures and accident plans so that the staff can deal with them in a timely manner. In a few days, I will take out our Lian Chun accident plan and share it with everyone.
Especially for cold-shock type towers, the over-temperature phenomenon is particularly prominent during emergency stops. We have suffered a lot. We hope that all brother manufacturers can learn from our lessons, maintain and protect the catalysts, and work together for the stable, long-term and efficient operation of the alcohol system. Thank you.
The operating pressure of the combined alcohol tower is mostly 12MPa, and there is no shell-and-tube synthesis tower. Otherwise, the pressure difference on both sides of the water and gas is too large, and the combined alcohol tower is either a cold shock type or a cold tube type.