Hydrocracking pressure relief definition
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Please tell me what are the manual start conditions for the 0.7MPa/min pressure relief valve in your device. Its automatic start condition is that the circulating hydrogen compressor is shut down, but what about the manual start conditions? I read a lot of information and it seems that the definition of this is rather vague. They all think that it needs to be started manually. I would like to ask if you have any specific definition of this? At what specific temperature rise or bed temperature does it need to be started manually?
0.7MPa/min and 2.1MPa/min are the standards commonly used for pressure relief in industrial devices. They are empirical values. This standard is used for joint oils with pressures above 10MPa and does not change with the total pressure. 0.7MPa/min is a safety protection facility to quickly release the device pressure. 2.1MPa/min is a protection facility used when the reaction bed is severely over-temperature. The fastest pressure relief of the emergency pressure relief system is usually limited to about 2.0Mpa in the first minute of pressure relief. The pressure relief speed in the first minute cannot be >2.1Mpa. If the pressure relief speed is too fast, the pressure difference of the entire high-pressure system will suddenly increase, which will cause damage to the equipment, especially the reactor's internal structural supports, etc. due to the high pressure exerted on the reaction bed. It should also be pointed out that when designing the internal structural support, the weight of the catalyst and solid sediments, as well as the pressure exerted on the bed when starting 2.1MPa/min, must be taken into account.
The pressure relief depends on the situation at the time. If the high-pressure system leaks and the reaction temperature cannot be controlled, it depends on the judgment ability of the main operator.
The conditions for starting the 0.7MPa/min pressure relief system can depend on the control effect of the accident. The conditions are relatively mild. However, the 2.1MPa/min pressure relief system must be started only when it seriously threatens the safety of the device. Because its startup will cause great damage to the system equipment, it must be used with caution, otherwise it will seriously affect the service life of the device and equipment, and it will lay the foundation for the next accident.
0.7MPa/min and 2.1MPa/min are the standards commonly used for pressure relief in industrial devices. They are empirical values. This standard is used for joint oils with pressures above 10MPa and does not change with the total pressure. 0.7MPa/min is a safety protection facility to quickly release the device pressure. It cannot be said that it will not work if 0.5MPa/min or 1.0MPa/min is used. 2.1MPa/min is a protection facility used when the reaction bed is severely over-temperature. The fastest pressure relief of the emergency pressure relief system is usually limited to about 2.0Mpa in the first minute of pressure relief. The pressure relief speed in the first minute cannot be >2.1Mpa. If the pressure relief speed is too fast, the pressure difference of the entire high-pressure system will suddenly increase, which will cause damage to the equipment, especially the reactor's internal structural supports, etc. due to the high pressure exerted on the reaction bed. It should also be pointed out that when designing the internal structural support, the weight of the catalyst and solid sediments, as well as the pressure exerted on the bed when starting 2.1MPa/min, must be taken into account. The design of the pressure relief pipeline for setting off the flare is undertaken by specialized personnel from the engineering contracting company.
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