Problems with the emergency cooling system in ethylene plants
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What is the purpose of adding nitrogen and fuel gas inlet lines to the pipeline that carries the pyrolysis gas to the quench tower?
Nitrogen is usually used for purging. Fuel gas is usually used for flareing in emergency situations.
The statement on the second floor is incorrect. The fuel gas is connected in order to prevent the formation of negative pressure.
I mean usually. What was said upstairs is also one of those situations. Just as nitrogen sometimes also prevents the formation of negative pressure.
Excessive nitrogen supply can easily result in ethylene products that do not meet the standards.
Could it be that it serves a purpose in circulating cooling? It’s just an idea though
Everything said upstairs makes sense! Just to add. The purpose of injecting nitrogen and pyrolysis gas is the same: to protect the equipment. When the pressure in the equipment is low, pyrolysis gas is preferred for injection; however, if there are issues with injecting pyrolysis gas, then, in order to protect the equipment, concerns regarding the product are set aside, and nitrogen is injected urgently! ————My humble opinion
They are all used for emergency pressure supplementation, to prevent a negative pressure in the quenching system caused by an insufficient return flow of the pyrolysis gas compressor during startup/shutdown or in case of accidents, which could damage the equipment
Prevents the system from developing negative pressure, used for pressure compensation.