Over-temperature of the synthesis tower wall after emergency shutdown?
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The synthesis tower is 23 meters high and 22 meters wide. After each emergency stop, the tower wall overheats; during normal operation the temperature is kept around 100 degrees, with an alarm triggered at 120 degrees
After an emergency stop, the circulator also stops operating. Since there is no gas flow in the system and the temperature of the components inside the synthesis tower is high, the temperature of the outer cylinder will increase, but this increase occurs at a slow pace. If the temperature rises very rapidly, it is necessary to check whether the insulation around the components in the synthesis tower is adequate or if there are problems with those components.
After an emergency shutdown of the synthesis system, to prevent overheating of the tower walls, it is possible to open the rear vent for pressure relief; this allows gas to flow out slowly, carrying away heat and thereby reducing the temperature of the catalyst layer, which in turn helps to lower the temperature of the tower walls.
Thank you for your guidance, expert. But our synthesis tower has only been in operation for a year – the internal components can’t be that fragile, right? Additionally, special attention is paid to the pressure difference of the tower during operation; the target value is 6 kilograms, with a control range of around 2 kilograms, and the system’s pressure difference also remains within this target range.
After an emergency stop, the pressure can be reduced gradually, allowing the gas flow along the tower walls to carry away the heat
I think a pressure difference of two kilograms is a bit low; the pressure difference in a synthesis tower is usually between 5 and 8 kilograms, as the reaction taking place inside the tower involves a reduction in the volume of the gas. If there is no problem with the inner component, poor insulation of the inner component may also allow heat from it to transfer to the outer cylinder, resulting in overheating of the outer wall.
After each emergency stop, if the shutdown duration is long and the system pressure drops below 7 kilograms, nitrogen is introduced through the inlet drain valve on the tower wall to lower the temperature of the tower wall. Since the pressure in the nitrogen pipeline is 7 kilograms, I’m not sure whether this approach will have an impact on the catalyst
There’s no issue of tower wall overheating during normal shutdown, right? If the temperature does not rise during normal parking, as the previous friends mentioned, vent it from behind the tower. It should work.
Well, under normal conditions, the wall of the parking tower does not overheat. If an emergency stop is initiated, the tower wall will overheat
Cyclic cooling and venting; if possible, use an inert gas to displace the reaction gases in order to consume them and prevent the formation of dead zones containing reaction gases
It’s normal; a slight increase in temperature has no impact, so there’s no need to make a big deal out of it.