How to handle an unexpected power outage that causes shutdown of an ethylene plant?

There is generally a certain delay time; in our case it’s 6 seconds, and this value can be adjusted. However, either an excessively long power fluctuation period or too short a delay time can cause the system to stop operating. Emergency start of the compressor after power fluctuation

The power failure protection time is very short; it seems to be 2 seconds in our company.

It’s difficult, because a large amount of electricity is required.

If the power fluctuation lasts too long, it is pointless to restart the motor. Generally, a power fluctuation of about three seconds is sufficient to allow the motor to restart, thereby not affecting the production process. Artel Company’s products for protecting against voltage fluctuations • 1) MRR series low-voltage motor restart controllers (220V, 380V) (for controlling a single motor): –1C: Controlled by conventional AC contactors; –2C: Controlled by star-delta starting circuits or reduced-voltage starting circuits; –3C: Controlled by mechanical switches such as DW; –4C: Controlled by frequency converters or soft starters. • 2) FZQD-III type motor batch restart device. • 3) FZQD-IV type motor batch restart device. QQ523969555 Email: luoc@szartel.com

It’s very difficult:) :) :) :) :)

Our company also has a power failure protection mechanism, but it doesn’t activate in the case of voltage fluctuations

I’m not sure which ethylene plant this refers to; generally, propylene compressors are driven by steam turbines, so power outages don’t have much impact on them! If the propylene compressor stops, just follow the emergency shutdown procedures. There should be similar emergency plans in place for the position. As for the user having no liquid, it’s not a big deal; the reason is simple – there’s no interlock in place. Rather, to prevent a high liquid level in the suction tank, it is necessary to close the user’s feed valve in a timely manner to avoid excessive backflow of liquid. After the vehicle comes to a stop, there is basically no pressure difference between the various sections, so it is not possible for the user to collect liquid! ! ! Generally, the delay protection for large high-voltage, high-power motors is 0.2–0.5 seconds; even with dual power supplies, the motor will still trip! The power fluctuation has stopped; there’s no need to panic. Just ensure that the equipment shuts down safely – it’s not an accident caused by negligence! Check the operating condition of electrical equipment at all levels and reset it promptly. Ensure that the backup power equipment operates properly. The utility systems are crucial; as long as the steam system remains intact, nothing serious will happen.

For the propylene compressor, follow the emergency shutdown procedures, but do not delay too long – it must be restarted immediately; otherwise, the lack of liquid will affect the ethylene compressor and the ethylene product, and it is even possible that the entire system will shut down.

There is a requirement to reduce the switching time of the backup power supply. Generally, ethylene plants are powered by the power stations or thermal power plants owned by the same company; therefore, an external power source must be used as a backup. Under normal circumstances, the switching process can be completed before all the pumps trip. Finding a good backup power source is a great way to solve this problem. As for how to handle process operations after power fluctuations, every employee in the ethylene plant should take the initiative to learn the emergency response procedures provided by the workshop; of course, it’s also very beneficial to communicate more with experienced workers!

What’s the rush? In the worst case, just open the safety valve and release it to the flare system. Flashovers cannot be avoided 100% of the time.