Low-flow self-protection for raw materials
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I would like to ask experienced friends: under what conditions is the low-flow self-protection feature used in heavy oil catalysis? How is it all invested? What are the precautions after it is put into use? Instead of using the self-protection screen, prevent the raw materials from going through the emergency bypass routes such as the distillation tower; simply shut down all nozzles and stop the feed pump immediately – is that possible? Also, under full load, if an emergency occurs and raw materials are supplied immediately for self-protection, the regeneration pressure becomes much higher than that on the reaction side – will the main air flow toward the reaction side? What should be paid attention to
1. When the feed pump stops or runs out of fluid, feed interruption should trigger the feed auto-protection system. Once this system is activated, the valves that operate include the feed valve, which is closed, the emergency bypass line, which is opened, and the feed atomization steam valve, which is also opened. If you don’t have time to run outside, the response assistant should immediately go out to check the status of the self-protection system; if there are any issues, they need to be resolved manually. 2. The feed nozzle root valve should be closed only after the assistant has left. Open the circulation preheater manual valve.
1. In actual production, when the crude oil pump becomes empty or stops operating, it is not necessary to activate the crude oil self-protection system. In such cases, the residue blending unit can be used to increase the amount of residue or recycled oil, while simultaneously reducing the value of the regeneration slide valve and adjusting the heat extraction load of the external heat exchanger in order to maintain thermal balance between the two units. 2. When the main air low-flow protection and the pressure difference protection between the two devices activate, the raw material protection must also activate accordingly. 3. After the raw material auto-protection function is activated, the raw material pump can be shut down; this is exactly what my system does. If the raw material auto-protection function is not activated on the control screen, it is necessary to activate the emergency steam system for raw material protection on-site. 4. After the raw materials are put into self-protection mode, accident steam enters the lift tube reactor; the pressure in the settler should not drop rapidly. At this point, the regeneration slide valve should be reduced to control the reaction temperature properly ； If the pressure in the settler drops to a very low level, the differential pressure interlock will definitely activate, closing both single-acting slide valves. The operator needs to reduce the set value for the regenerator pressure (in automatic mode) or switch the double-acting slide valves to manual control in order to lower the pressure