What are the precautions for an emergency shutdown of a sulfur-resistant shift reactor?

Temporary shutdown: Close the inlet and outlet valves of the low-voltage transformation system, as well as the drain and sampling valves, to maintain insulation and pressure. If the bed temperature drops, the system pressure should also be reduced to ensure that the bed temperature remains 30°C above the dew point; when the temperature falls below 120°C, the pressure must be reduced to atmospheric level, after which positive pressure is maintained using gas, shift gas, or refined gas stored in cylinders, to prevent air from entering. In the case of an emergency stop, as with a temporary stop, close the inlet and outlet valves of the system, as well as the drain and sampling valves, in order to maintain pressure and temperature. Pay attention to the liquid level in the hot water tower to prevent excessive levels from flowing into the low-temperature converter. For long-term parking, before shutting down the entire system, relieve pressure and use dry gas to cool the catalyst bed to a temperature below 40°C. Close the inlet and outlet valves of the low-temperature shift reactor as well as all pressure measurement and analysis sampling points, and install blind flanges. Maintain a slight positive pressure (around 30 mm of water column) using gas, shift gas, or refined gas stored in cylinders (such as nitrogen, with an O2 content of <0.1%); it is strictly prohibited for air to enter the furnace. When it is necessary to inspect the catalyst bed, it must first be purged with N2 (O2 < 0.1%), and only then can the manhole be opened, in order to prevent gas convection from allowing air to enter the catalyst (i.e., the chimney effect). The temperature of the low-temperature converter can be reduced to 120–150°C by using steam for displacement.

For long-term parking, it is necessary to: 1. Release pressure, 2. Cool down and remove water, 3. Fill with nitrogen for displacement, 4. Isolate with a blind flange, 5. Fill with nitrogen for protection, 6. Monitor temperature and pressure

I’m not quite sure yet – is medium-temperature (wide-temperature) transformation the same as low-temperature transformation?