Riser outlet temperature
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Why cannot the temperature at the riser outlet exceed 540°C during startup, shutdown, and in case of accidents? What equipment is being protected by this restriction? (The sedimentator equipment is protected by a lining.), I hope the teachers can provide guidance; thank you!
There are many components in the reactor that lack lining protection, such as grills. Also, the material of the reactor is not as heat-resistant as that of the regenerator
One reason is the fear that oil and gas will coking inside the settler; another reason is the concern that the coke in the settler could burn at excessive temperatures and damage the equipment. This is also why, in an emergency situation, the flow of emergency steam and atomized steam is increased.
The internal components of the settler (cyclones, legs, grills, etc.) are generally made of 15CrMoR or carbon steel. The oxidation resistance limit temperature for carbon steel is 565°C, while that for 15CrMoR is 590°C. It is necessary to keep the temperature at the exit of the lift pipe below 540°C, as high temperatures can cause the coke inside the settler to burn and damage the equipment. This is also why, in case of an accident, the flow of emergency steam and atomized steam is increased.
The reason why the exit temperature of the riser cannot exceed 540°C is a design requirement, aimed at protecting certain equipment.
Another reason for increasing the amount of accident steam or atomized steam in an accident scenario is to ensure a minimum flow rate within the lift pipe!
The cyclone is made of chrome-molybdenum steel, whose maximum operating temperature is 538°C.
The internal components of the settler (cyclones, legs, grills, etc.) are generally made of 15CrMoR or carbon steel. The oxidation resistance limit temperature for carbon steel is 565°C, while that for 15CrMoR is 590°C. It is necessary to keep the temperature at the exit of the lift pipe below 540°C, as high temperatures can cause the coke inside the settler to burn and damage the equipment. This is also why, in case of an accident, the flow of emergency steam and atomized steam is increased.
Vice-Super Editor, copy and paste? Do you lack this amount of wealth, or what?