Pyrolysis gas compressor
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The purpose of installing a low suction pressure interlock on the pyrolysis gas compressor is to ensure that when the pressure reaches a certain value, the anti-surge control is bypassed directly and the anti-surge valve is opened. Let’s analyze why it was designed this way.
Your question is too limited; I’m not sure what type of compressor you are using. Gas compressors can be roughly divided into two types: positive-displacement types (such as piston, screw, Roots, gear, etc.) and centrifugal types. Oh, seeing “surge” must mean it’s a centrifugal compressor. The interlock for low suction pressure can be due to the requirements imposed on the material, or it can also be caused by low suction pressure leading to equipment surge. For the second question, you might have said it the wrong way; it should be that when the pressure exceeds the set upper limit, in order to prevent surging, a surge control valve is used to regulate the pressure and avoid surging of the equipment. It’s not that “when the pressure reaches a certain value, it directly bypasses the anti-surge control and opens the anti-surge valve.” ”Right? Real* moderator? Maybe my answer is too simplistic? ? ? I’m not into pyrolysis; this is just for reference.
It’s okay; the purpose of discussion is to speak freely. To the best of our knowledge, there are no positive-displacement types of pyrolysis gas compressors (such as piston, screw, Roots, or gear) as you mentioned. The suction pressure, suction temperature, as well as the discharge pressure and temperature all play a role in a proper anti-surge control system. In addition to the low normal inhalation pressure causing low inlet flow, the anti-surge valve opens. I want to set a separate low suction pressure threshold that will cause the anti-surge valve to open, leading to a continuous low-compressor interlock shutdown. It is to protect the safety of the pyrolyzer from being subjected to negative pressure, which could damage the equipment.
Low-pressure interlock, anti-surge protection, and protection against equipment collapse due to negative pressure.
I’ve never seen an interlock based on low pressure before; however, the inlet and outlet pressure and temperature values are indeed used in the calculations to prevent surge, and it’s necessary to design it that way. As for such an interlock, the original poster could share some images so that everyone can see it.
Low pressure and flow rate not meeting requirements cause compressor surge; this is done for safety reasons
If the design does not create negative pressure, it is extremely dangerous if negative pressure does occur
Nowadays, cooling water towers are all equipped with vacuum-breaking systems to prevent the compressors from running out of pressure
Hello, could you explain how the vacuum-breaking system of this quench tower works? Thank you.
In our system, when rapid cooling causes the pressure in the water tower to drop, pv20001b is activated to introduce fuel gas into the tower in order to increase the pressure. When the pressure in the water tower is high, the PV20001A valve opens, allowing the gases inside the cold water tower to be released into the hot flare system, thereby protecting the compressor and the water tower
The inlet of the water scrubber tower in our current ethane cracking to ethylene plant is also equipped with nitrogen + natural gas pressure supplementation pipelines. When the pressure in the water washing tower is low, the pressure relief valve opens to maintain the tower pressure.