Problems after the compression, condensation, and liquefaction of exhaust gases
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For the low-pressure off-gases from intermittent polypropylene plants, after being compressed and condensed into a liquid state by a compressor, is it necessary to temporarily store them in a liquid storage tank before feeding them into the feed tank, regardless of mass considerations? Can it flow directly into the raw material tank?
Generally, a pump is used to transfer liquid from one container to another; a storage tank must be available in advance, and a certain liquid level needs to be maintained, as this is beneficial for the proper operation of the pump. In fact, many principles apply across various fields in chemistry. When studying, it’s important to pay close attention and ask why things are done in certain ways – this will help one understand the common design principles used in chemical installations, thereby avoiding silly mistakes in design. This way, learning will progress more quickly.
Thank you for the answer! But I can’t figure it out – then why can’t it be poured directly into another container? Is there any problem with using another container as a liquid storage tank?
To explain this issue, we first need to talk about centrifugal pumps. The working principle of a centrifugal pump is that the centrifugal force generated by the high-speed rotation of the pump’s impeller is used to \"throw\" the water inside the impeller outward, creating a vacuum area at the center of the impeller. Water from the source is continuously \"sucked in\" and then \"thrown out,\" and this process repeats over and over again to achieve the pumping of water. The operating characteristics of centrifugal pumps require that there be no large number of bubbles in the water; otherwise, the pump cannot function properly, which may lead to damage to its core component—the impeller. The purpose of having a liquid storage tank and maintaining a certain liquid level is to ensure that there are no large bubbles in the water ； It is difficult to ensure this when going directly into the pump.
Hehe, guys, you’re going off-topic.
Intermittent polypropylene plants are classified as follows: High-pressure recovery: Sent directly to the raw material tank for use in feeding. Medium-pressure recovery: After compression and condensation, it is stored in a liquid-phase buffer tank; then it is pumped back to the spherical tank for further refinement before use. Off-gas recovery: After compression and condensation, it is stored in a liquid-phase tank and is not reused, but sold directly as liquefied gas.