Discuss the operation of water ring vacuum pumps in various factories

We use water ring vacuum pumps; 1. Their vacuum level is higher than that of compressors, and the outlet pressure is lower than that of vacuum pumps. This depends on the process to be chosen. 2. There are few faults during operation. However, we have one problem: there is severe scaling, requiring a service call every six months on average. We draw in hot air, and it needs to be cooled during operation, as the heat generated is very high. Proper operation is required when starting and stopping. It is necessary to carry out proper maintenance and inspections on a regular basis, and any issues must be addressed immediately; otherwise, small problems can turn into big ones.

Water ring vacuum pumps are generally used in distillation systems with moderate or less stringent vacuum requirements; our facility has chosen to use them in the drying tower. There are basically no major issues during operation; when selecting, attention should be paid to the quality of the nozzle. Pay attention to the water temperature during operation; when the water pressure is stable, the water temperature has a significant impact on the vacuum, so make sure to top up with cold water. Additionally, trace amounts of materials may be carried in its circulating water, so attention should be paid to their recovery.

This post was last edited by yangwei*ao1128 on 2011-7-6 at 19:35. We use water ring pumps as the vacuum system for our film-evaporation evaporators. Generally, we don’t encounter any problems throughout the year; maintenance is carried out only during major repairs. It seems that the technology behind water ring pumps is quite mature, and their operational stability is good. However, we don’t have a water recycling system, which results in high water costs every year. We are currently considering whether to switch to W pumps, and we’re not sure about their operational stability

We are PSA units, liquid ring pumps used for vacuum pumping during adsorbent regeneration; they are simple to operate. The common problem is that the couplings often break, while other aspects are fine

The answer on the third floor was very good; it emphasized the importance of water temperature and material recycling to protect the environment. It was just a mistake to assume it was a hydraulic jet pump, as water ring pumps do not have nozzles. Additionally, if water is chosen as the working fluid, attention should be paid to its hardness; when scale forms, it must be removed promptly.

Reply to 3# laoluo768: Is water containing trace amounts of substances still recycled? Recycling is generally not easy; the material can be sent to a wastewater treatment plant for processing. However, it is necessary to install a buffer tank before the pump in order to separate the cooled liquid. When using vacuum for filtration, care must be taken to prevent the mother liquor from entering the pump. The materials involved are usually corrosive, so the water ring pump needs to be replaced after operating for a certain period of time to avoid corrosion damage to the pump.

Reply to 7# nglcx2003cn: The circulating fluid used in liquid ring pumps is not necessarily water; it can also be some substance with a low freezing point, low volatility, and compatibility with the materials carried by the pump. Such pumps are sometimes also referred to as liquid ring pumps. In the areas of our company where water ring vacuum pumps are used with water as the circulating medium, it is usually the case that the material being handled has a low freezing point – it remains in liquid state at room temperature – and is insoluble in water. As you mentioned, a buffer tank is generally installed. For the circulating fluid in the water ring pump, we use deionized water, and a small heat exchanger equipped with cooling water is placed at the inlet of this circulating fluid to regulate its temperature. This heat exchanger needs to be cleaned regularly; it is typically opened every six months or so for cleaning and descaling, which helps to ensure the long-term stability of the vacuum system. A reverse U-shaped bend or overflow port is installed on the buffer tank to allow the recovery of the material, so that wastewater is not discharged in most cases.

Reply to 8# laoluo768: Your situation represents favorable operating conditions. If deionized water is used and a heat exchanger is employed, with no formation of scale or similar issues, it is indeed possible to avoid changing the water for an extended period of time. If the air drawn in contains acidic gases, these gases will be absorbed into the pump’s circulating fluid, causing changes in the properties of that fluid.

Reply to 2# zhaoq0528: Our company specializes in the production of water-sealed vacuum pumps. If you have any questions regarding such pumps, feel free to ask. I am happy to help resolve the issue for your company. Thank you

Our company is engaged in the hydrogenation of crude benzene; we use liquid ring vacuum pumps to create negative pressure in the heavy fraction removal tower and the solvent recovery tower. These pumps are highly efficient, require little maintenance, and use xylene as the working medium, which is recycled. A mist catcher is installed at the outlet to reduce the loss of light components; when the liquid level is high, it can be drained into a sump for collection, with no losses occurring.