Issues regarding the cooling water for water ring vacuum pumps
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The current situation is as follows: the softened water in use contains a large amount of CO2 during circulation, which makes the water acidic with a pH of 6. Considering that when the vacuum pump draws in air, the pressure inside the pump decreases, the saturated CO2 in the water escapes due to reduced solubility, thereby affecting the efficiency of vacuum creation. Consider adding NaOH solution to the recirculating water to react with CO2 and, incidentally, neutralize it to neutrality. I wonder if it’s feasible? What should be noted? Will the sodium carbonate produced cause scaling on the pump impeller, etc.? Seeking help from fellow sea lovers.
A temperature upper limit is set; once that temperature is reached, fresh water is added, and the water is replaced every five or six minutes
For this, the decarburization process of wastewater treatment plants can be used as a reference. Some systems use alkali for neutralization, but they are equipped with advanced filtration and ionization devices; others employ carbon removal towers, which offer a simple process and easy operation. You might want to consider this option, as it allows for centralized treatment before the softened water is put into use.
Thank you. Does that mean that adding alkali alone poses a risk if there are no subsequent filtering or ionization devices? My softened water doesn’t need to be treated; it’s the circulating water of the vacuum pump that needs to be treated when there is no water supply. Also, I would like to ask what are the requirements for the inlet pressure of the cooling water for the vacuum pump?
Is it possible to switch to a different type of pump, use a positive-displacement pump, or simply add fresh water to reduce the CO2 concentration?
Thank you; the cost of replacing the pump is too high, and continuously adding water also increases water consumption. Which types of positive displacement pumps are you referring to?
No matter what size water ring vacuum pump you use, the amount of carbon dioxide released is very small compared to the pumping capacity of the water ring pump. The key is that the temperature of the working fluid must not be high; if its temperature rises, it will vaporize into water vapor under negative pressure. Most of what is drawn in by the water ring pump is water vapor formed by the vaporization of the working fluid, resulting in a significant reduction in the effective suction volume.
It has a weakly acidic nature; the lowest grade is 304 stainless steel used for flow-through components. Secondly, there are positive displacement vacuum pumps, such as reciprocating vacuum pumps, dry screw vacuum pumps, and air-cooled Roots vacuum pumps.