In chemical production, in order to reduce reaction temperature, increase evaporation capacity, and transport materials, the device needs to be in a negative pressure state.
The so-called negative pressure refers to the concept of relative to normal pressure, generally referring to a pressure lower than the absolute pressure of 101325pa.
The most common method in industry to obtain negative pressure is to use the operation of vacuum pumps to achieve negative pressure.
The so-called vacuum pump refers to a device or equipment that uses mechanical, physical, chemical, or physicochemical methods to extract air from the pumped container and obtain a vacuum.
Liquid ring vacuum pump is a type of vacuum pump that uses liquid as the working medium. The liquid is thrown towards the stator wall, forming a liquid ring concentric with the stator. The liquid ring and rotor blades together form a variable volume rotary variable volume vacuum pump.
A water ring vacuum pump is called a water ring vacuum pump, and other working media such as solvents, oil, sulfuric acid, and acetic acid can also be used. Water ring vacuum pumps are mostly used in industry.
In principle, vacuum desolvation and vacuum distillation both create a negative pressure environment to reduce the boiling point of materials, while more effectively ensuring evaporation, thereby improving production efficiency and product quality.
However, due to the fact that the condensation effect of materials under negative pressure is lower than that under normal pressure, it is inevitable to pump partially condensed medium steam into the inlet of the vacuum pump, which is directly discharged into the atmosphere. This not only pollutes the environment, but also wastes resources and increases the production cost of enterprises. The use of liquid ring vacuum pump closed circuit circulation process can effectively solve the above problems.
From the working principle of the liquid ring vacuum pump, it can be seen that the extracted gas is in full contact with the working liquid near the impeller of the vacuum pump, and then is thrown out together by the high-speed rotating impeller.
Using this principle, liquid ring vacuum pumps can also be applied to exhaust gas absorption. The application of liquid ring vacuum pump in exhaust gas absorption has several major advantages:
① A certain negative pressure can be formed on the inlet side of the exhaust gas, keeping the entire device in a negative pressure state, effectively ensuring the leakage of exhaust gas, which is conducive to the safety of the operating environment and the occupational health of operators.
The size of negative pressure can be determined according to process requirements, and automatic interlocking can also be used to ensure that the negative pressure is stable within a certain value.
② During this process, the liquid ring vacuum pump can act as a fan, but the pressure difference is stronger than the fan; It can also play a stirring role, but the effect is stronger than stirring, and it is simple and easy to operate.
③ In addition, the selection of working fluid is also determined based on the different absorbed media and principles. For example, absorbing acid gas can use alkaline solution as the working fluid, which can neutralize and dissolve.
Absorb a small amount of alcohols and use water as a working fluid; Absorbed media can also be used as working fluid, etc. Simultaneously changing the temperature of the working fluid can also enhance the absorption effect.
In chemical production, material transportation is also one of the common chemical operations. In principle, material transportation refers to imparting a certain amount of kinetic energy to the material, which means giving it a certain pressure difference, and the liquid ring vacuum pump precisely meets this condition.
Compared to other mechanical vacuum pumps, using liquid ring vacuum pumps for material transportation has several major advantages:
① Due to the exhaust gas absorption function of the liquid ring vacuum pump, compared to other mechanical vacuum pumps, it has greater advantages in extracting easily gasified solvents;
② In addition, due to the structural differences of liquid ring vacuum pumps, compared to other mechanical vacuum pumps, they have stronger reliability when pumping media containing solid particles;
③ At the same time, liquid ring vacuum pumps can also be used for gas transportation, especially for gases containing small amounts of liquid. This is incomparable to other mechanical vacuum pumps.
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