Details of start-up, shutdown, heating, and cooling procedures for hydrogen production using natural gas

Typically, the process of producing hydrogen from natural gas involves many steps, including pretreatment, conversion, cooling, separation, and other processes. Each step has its own unique set of operating procedures, including startup, shutdown, and temperature control. To provide a preliminary reference, the following briefly outlines some basic procedures for starting up and shutting down the system as well as for adjusting temperature: 1. Startup procedure: – Start the pretreatment equipment to desulfurize and dehydrate the natural gas, thereby preventing catalyst poisoning and extending its service life. - The converter is heated, and the reaction takes place at the predetermined temperature. Make sure to maintain a constant pressure to avoid explosions. - The specified temperature requirement is met by adjusting the fuel gas flow rate to the converter or the supply volume of main steam. 2. Parking procedure: - Reduce the feed flow rate to the converter, and gradually cool the converter to room temperature. - Turn off the pretreatment equipment and release all system pressures to atmospheric pressure. - After the converter has cooled down completely, close all gas line valves. 3. Heating operation: – During the cold start of the system, it is necessary to gradually increase the temperature of the conversion furnace; intermittent heating is generally used to keep the temperature within safe limits. 4. Cooling procedure: – When the system is shut down, it is necessary to gradually cool the conversion furnace in order to prevent damage to the equipment caused by thermal expansion and contraction. The above is only a simplified version of the operating procedures. In actual production, flexible adjustments must be made based on specific process requirements, technical parameters, and equipment conditions, while strictly adhering to the corresponding standard operating procedures. It is recommended to carry out the operation under the guidance of professionals to ensure the safety of personnel and equipment. .

When the temperature is increased, do the desulfurization tank, the converter, and the medium-frequency furnace all increase their temperature at the same time? What should be done if that one reaches temperature first?