Assuming a power outage occurs across the entire plant and the utility systems fail, what is the most appropriate way to proceed with hydrogen production?

The problem is quite serious with many details; the general approach is to take urgent shutdown measures to protect the catalysts and equipment! The DCS system is equipped with a UPS backup power supply that can provide support for about half an hour; pay attention to the air intake and exhaust valves! When the wind valve is opened, it is necessary to contact the operator promptly to close it; pay attention to the steam supply as well as the level of liquid in the drum, and shut down the PSA system in a timely manner. When the wind valve is closed, make sure to close the first-stage manual valve to prevent high pressure from leaking into the low-pressure area!

It is correct to pay attention to the operation of the air on/off valves, but it’s not necessary to close those valves completely on site. For example, the control valve should be adjusted so as to maintain a certain amount of steam supply (in our case, 8 t/h), and then it should be closed completely after 15 minutes. The inlet valves on the steam drum, as well as the upstream and downstream control valves, should also be adjusted to a lower setting on site

When the utility services fail, that is, when there is no water, electricity, or gas, it becomes necessary to suspend operations on an emergency basis. Once a power outage occurs, the drums and exhaust fans will trigger an interlocked shutdown of the furnace ； The vent valves for intermediate reformate gas, desorbed gas, and product hydrogen are all air-operated valves; in the event of a power or instrument air outage, they will automatically discharge the gas to the flare. Operators can control the rate of pressure reduction of the intermediate reformate gas, with this rate being limited to ≤0.2 MPa/min to prevent excessive pressure drops that could cause the catalyst to be damaged. After shutting down the furnace, the compressor is taken out of service; it is confirmed that the raw material feed valve, the desorption gas valve, and the fuel gas shut-off valve are closed, and that the PSA unit has been stopped. Ensure the proper supply of steam, and confirm that it is turned off after 15 minutes. Pay attention to the liquid level and pressure in the steam drum; the operator on site can be asked to turn off the drain valve. Additionally, the vent valve and fuel gas valve of the burner must be closed, and the liquid level in the medium-pressure gas water separator tank must be controlled. It is necessary to contact the utility department regarding the restoration time, fill the drum with water promptly, and use nitrogen for displacement ； Get ready to resume production

Emergency response plans that need to be prepared before operation – **wasn’t that taken care of? P

If everything comes to a halt, it means the entire plant is shut down, and the emergency response plans for the upstream and downstream units need to be coordinated~~~ This isn’t just a situation where one single unit stops operating~~~