Installation location of the shut-off valve for the heat transfer oil system in methanol-to-hydrogen process

In the methanol-to-hydrogen process, the heat transfer oil system is an important auxiliary system; its function is to transfer thermal energy through the heat transfer oil in order to provide the required reaction temperature. Since the heat transfer oil system involves the circulation of high-temperature oil, it is crucial to ensure the safe operation of the system. Therefore, a shut-off valve is installed to quickly stop the flow of heat transfer oil in emergency situations, preventing the accident from spreading. The installation location of cut-off valves should comply with the following basic principles: 1. **Inlet and outlet areas**: Cut-off valves should be installed at the inlet and outlet points of the heating oil supply lines and return lines, so as to quickly cut off the oil supply in emergency situations and prevent accidents caused by heating oil leakage or abnormal flow. 2. **Both ends of the heat exchanger**: Isolation valves should be installed at each inlet and outlet of the heat exchanger, so that it can be isolated when maintenance or repair is required, thereby ensuring the safety of the maintenance personnel. 3. **Pump inlet and outlet**: Cut-off valves should be installed at the pump’s inlet and outlet to ensure its safe operation and to allow the pump system to be isolated during maintenance. 4. **Key nodes**: Other important nodes in the system, such as diversion and convergence points, should also consider having shut-off valves installed to facilitate the control of partial operation of the system. For specific installation specifications and requirements, you need to refer to **or the relevant local standards and regulations, such as the \"Regulations on Safety Supervision of Thermal Equipment in Industrial Furnaces\", the \"Boiler Safety Regulations\", the \"Fire Protection Code for the Design of Petrochemical Enterprises\", etc. Additionally, a specific implementation plan should be developed based on the actual conditions of the enterprise and its equipment setup. When determining the specific location and type of isolation valves, it is advisable to consult professional design firms or safety assessment experts to develop solutions that meet the actual operating conditions and safety requirements, and to ensure the proper operation and maintenance of these isolation valves within the system. At the same time, it is important to provide appropriate training for the operators to ensure they are familiar with the operating procedures for the cut-off valves, so that they can take swift and effective action in emergency situations. .

May I ask, is this cut-off valve automatic or manual? Is there any clear explanation?

The cut-off valve should be installed at key locations in the heat transfer oil system, so that the supply of heat transfer oil can be quickly interrupted in emergency situations, thereby preventing the expansion of accidents. Specifically, the shut-off valve can be installed in the following locations: at the inlet of the heat transfer oil system – by installing a shut-off valve before the heat transfer oil enters the methanol-to-hydrogen system, it is possible to effectively control the supply of heat transfer oil. In the event of a system anomaly or an emergency shutdown, this valve can be closed immediately to cut off the supply of heat transfer oil. In front of and behind key equipment: For the key equipment in the system (such as heaters, pyrolysis reactors, etc.), isolation valves can be installed in front of and behind them. In this way, when a device fails or requires maintenance, the heat transfer oil supply to that specific device can be cut off separately, without affecting the normal operation of other devices. High-risk areas in the system: Based on the results of the safety assessment, if there are certain high-risk areas within the system (such as areas prone to fire and explosion, or areas with high temperatures and pressures), isolation valves should be installed near these areas so that they can be quickly isolated in emergency situations.

In the methanol-to-hydrogen heat transfer oil system, the installation location of the shut-off valve should ensure the safe and efficient operation of the system. The following are the key installation locations: Heat transfer oil inlet and outlet: Isolation valves are installed at the points where the heat transfer oil enters and leaves the reactor, to allow for quick shutdown of the oil flow in emergency situations. Before and after the heating furnace: Isolation valves are installed at the inlet and outlet of the heating furnace to isolate it in case of equipment failure or maintenance. Before and after the heat exchanger: Isolation valves are installed at the inlet and outlet of the heat exchanger to facilitate its isolation for maintenance or emergency shutdown. Inlet and outlet of the heat transfer oil tank: Isolation valves are installed at the inlet and outlet of the tank to facilitate its isolation for maintenance or to cut off flow in emergency situations. Inlet and outlet of the pump: Cut-off valves are installed at the inlet and outlet of the heat transfer oil pump to facilitate maintenance and emergency isolation of the pump. System branch pipelines: Isolation valves are installed on each branch pipeline to facilitate the isolation of specific sections for maintenance or emergency shutdown. Before and after the safety valve: Install shut-off valves before and after the safety valve to facilitate its maintenance and replacement. Before and after the filter: Cut-off valves are installed before and after the filter to facilitate its maintenance and replacement. Expansion tank connection: A shut-off valve is installed at the connection between the expansion tank and the system, to facilitate the isolation of the expansion tank for maintenance. System high-point exhaust vent: A shut-off valve is installed at the high-point exhaust vent to facilitate system exhaust and maintenance. Precautions: Valve type: Choose valves suitable for high temperatures and corrosion resistance, such as ball valves or gate valves. Easy to operate: Ensure the valve is in a position that facilitates operation and maintenance. Safe distance: Valves should be installed at a safe distance to avoid areas with high temperatures or pressures. Automatic control: Consider installing an automatic shut-off valve to enable automatic shutdown in case of abnormalities. Proper installation of cut-off valves helps improve the safety and maintainability of the system.

Automatically, but it is generally also required to be able to be turned off manually