Selection of vacuum pumps in atmospheric and vacuum distillation units?
Thread Content
Atmospheric and vacuum distillation is widely used in the petrochemical industry in China as a relatively mature and fundamental technology. In light of the current environmental situation, this post is made to discuss the selection of vacuum pumps, which are important components of pressure relief towers. I hope everyone can offer suggestions and analysis. 1. Roots screw – dry vacuum pump. This type of pump has the characteristic of consuming water even when not in use, which overcomes the problem of excessive water discharge associated with wet vacuum pumps. It is now widely used by petrochemical manufacturers. However, its disadvantages include high cost, a relatively short service life, and low repair value in the event of failure. 2. Wet vacuum pumps: The type of pump most commonly used in refineries in the past. It features good lubrication performance and is less prone to failures. The downside is the large volume of wastewater; with strict environmental inspections nowadays, it’s difficult to meet the discharge standards without adequate water treatment measures. 3. Reciprocating vacuum pumps are inexpensive, but their wear parts need to be replaced frequently. Piston rings and other components need to be replaced after at most one month. However, as long as proper maintenance is carried out, this type of vacuum pump is the most economical and practical option. Our company is upgrading equipment. I’m currently struggling with choosing the right vacuum pump, and I hope everyone can offer some valuable suggestions.
Given the many drawbacks of vacuum pumps, it is recommended not to use them. The project can be postponed until vacuum pump technology is mature enough to be used.
Wet vacuum pumps can be modified into closed-system units, allowing the working fluid to be recycled, which saves resources and is environmentally friendly. Reduce wastewater discharge
The Luo Ci pump vacuum system is quite good; the spare parts aren’t expensive. Regular inspections and maintenance are necessary, and any issues related to dirt can be easily resolved. Even two full workdays are sufficient for a major repair. If you need it urgently, you can purchase a spare pump – just replace it when it gets dirty, align it properly, and it’s ready to use. There’s no rush to fix the main pump later on
Judging from the poster’s description, it seems they have conducted in-depth research on various types of pumps. In my opinion, none of them is absolutely the best; it’s sufficient to consider all factors and choose the one that suits you. Rotary vane vacuum pumps are now widely used in the petrochemical industry, and even design institutes consider them the preferred choice these days. The initial purchase price of screw vacuum pumps is relatively high, but their lifespan is long; regular maintenance is sufficient. (I have personally seen screw vacuum pumps purchased by Sinopec as early as 2007 that are still in use today.) Overall, their cost is acceptable for most companies.
Compared to traditional water ring pumps and other vacuum pumps, screw-Roths pumps are not only oil- and water-free, which is beneficial from an environmental perspective, but they also offer a significantly higher level of vacuum. Moreover, since the pre-pump is a dry pump, the load on the Roths pump is reduced, which lowers the likelihood of failures. Dry pumps are widely used in the chemical and pharmaceutical industries abroad, and in recent years, domestic customers have also come to recognize the advantages of these pumps. However, the uneven quality of some screw pump manufacturers affects their actual performance; it is therefore very important to find and use a screw vacuum pump that meets high standards. In the long run, its economic benefits outweigh the costs, and its operating conditions are already well-established; there’s no need for concern, so rotary screw compressors are indeed a worthwhile choice.