Design challenges of liquid ring vacuum pumps
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I would like to ask my colleagues: when selecting a liquid ring vacuum pump, if the suction temperature **exceeds the value permitted by the pump**, it is considered advisable to install a spray pipe near the pump inlet to cool the gas (note that heat exchangers are not suitable for this situation). However, cooling causes some of the gas to crystallize, which reduces the amount of gas that can be drawn in. Additionally, the water vapor generated by the spraying (along with the crystalline particles) also enters the pump. How should the pumping capacity of the pump be designed in such cases? Should it be based on the amount before spraying for cooling, or the amount after spraying? Looking forward to everyone's advice!!!
Without a container, does it simply cool down and crystallize? That also requires a long enough pipeline to allow the spray water to vaporize, thereby possibly reducing the temperature. Of course, the selection is based on the temperature and composition of the treated gas.
The situation you mentioned does not apply to liquid ring pumps. If the gas contains particles that can crystallize upon contact with water, scaling can occur between the impeller and the casing upon contact with the water ring pump. It won’t take long before the pump has to be stopped for cleaning. If the water hardness is high, scaling in the water ring pump becomes severe, especially when the gas contains crystallizable substances. If it is to be used, a spray cooling tower must be installed before the gas enters the vacuum pump, so that the crystallizable substances can cool and crystallize first. This allows for the use of a smaller pump, reducing investment costs, while also improving performance; furthermore, the spray liquid can be recycled. For the situation you mentioned, it is recommended to use a hydraulic jet vacuum pump.
The liquid ring pump was definitely selected based on the parameters after cooling. We have handled similar designs before; the original poster can send me the data sheet, and we’ll prepare a simple proposal for you: kevin-cheng@sunjet.com.cn
The one on the 3rd floor – you’re not being fair by copying word for word what I said on the Chemical Engineering Forum and posting it here. http://**/bbs/thread-114976-1-1.html You should at least indicate the source; doing otherwise is not proper for a moderator. This post was last edited by sonid on 2009-2-23 12:25.]