Types of vacuum pumps commonly used in salt industry

Since the 1950s, China's salt industry has undergone significant changes, the output is second only to the United States and the Soviet Union. Most salt production processes use multi effect evaporation to increase the effective temperature difference to improve the output, save energy and reduce consumption, while the first effect low-pressure steam pressure and temperature are basically stable, and the improvement space is limited, so we try to improve the final effect vacuum degree to achieve the purpose.

So how to improve the vacuum degree in salt making process? What type of vacuum pump should be selected to meet the needs of salt production process? This paper gives a detailed explanation of this problem


Model and main features of vacuum pump

There are many types of vacuum pumps, such as water ring vacuum pump, roots vacuum pump, reciprocating vacuum pump and steam jet vacuum pump. Its main features are as follows:

(1) Water ring vacuum pump - this pump can be used alone to extract water vapor or corrosive gas, but in the salt industry, the ability to discharge non condensable gas is limited, and the vacuum effect is general when the exhaust volume is not enough;

(2) Roots vacuum pump - this kind of pump is generally not used alone, and is often used in series with water ring vacuum pump as a vacuum unit. It has the advantages of high vacuum degree, does not consume medium pressure steam, and has better ability to discharge non condensable gas. However, after serious corrosion of rotor and impeller, the effect is poor, maintenance is difficult, and anti-corrosion materials should be selected during selection;

(3) Reciprocating vacuum pump - the biggest disadvantage is that there are many vulnerable parts, piston ring vulnerable and poor sealing;

(4) Steam jet vacuum pump is widely used by salt manufacturers, with good and stable vacuum effect and few maintenance, but the effect of foreign steam jet pump is better than that of domestic one.

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