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Several Typical Applications of Dry Screw Vacuum Pumps
Time：
2021-11-02
At present, the development of various vacuum pumps is increasingly affected by vacuum applications. Traditional traditional vacuum pump systems cannot meet the needs of cleaning, oil-free, corrosion-resistant, pumping condensable steam and operating in harsh conditions. Therefore, in recent years, dry vacuum pumps have developed rapidly, and vacuum products have been updated.
At present, the development of various vacuum pumps is increasingly affected by vacuum applications. Traditional traditional vacuum pump systems cannot meet the needs of cleaning, oil-free, corrosion-resistant, pumping condensable steam and operating in harsh conditions. Therefore, in recent years, dry vacuum pumps have developed rapidly, and vacuum products have been updated.
Screw vacuum pump is an ideal pump type that appeared in the early 1990s. Screw vacuum pump has a wide range of pumping speed, simple and compact structure, no friction components in the pump cavity, low energy consumption, no waste liquid discharge, low operating cost and a series of advantages, so it is widely used in semiconductor, photovoltaic industry, chemical industry, pharmaceutical industry, petrochemical industry, space simulation, low pressure wind tunnel and other fields.
Application of screw vacuum pump in solvent recovery in pharmaceutical industry.
The API that passes through the solvent crystallization process must be filtered, washed and vacuum dried after crystallization. The moisture content in the material is generally around 20, and the heating temperature cannot exceed 80. After drying, the moisture content in the API is lower than 0.5. In order to remove the solvent in the material, the pressure in the drying tank should be lower than the saturated vapor pressure of the solvent at the drying temperature, and it is usually required to dry under the condition of 0.150pa.
The traditional wet vacuum system usually uses a Roots liquid ring vacuum pump unit. During the operation process, the sealing liquid of the liquid ring pump will melt or absorb some organic lysases, strip them into the gas-liquid stripping tank, and strip them into organic waste gas and highly concentrated organic residual liquid. However, these two aspects need to be processed, which not only cannot completely recycle this part of the lysase, but also increases the company's cost, which is harmful to physical and mental health, safety and ecological protection.
The dry vacuum system composed of a roots pump and a screw vacuum pump can condense the organic solvent in the drying process during the drying process, thereby realizing the recovery of the solvent. Since there is no other process medium in the screw pump cavity, it is energy-saving and environmentally friendly, has no waste liquid treatment problems, and can recover all solvents. Therefore, screw vacuum pumps have become a better choice for this application field.
Application of screw vacuum pump in petrochemical industry, gasoline and steam recovery.
Due to the gradual emphasis on environmental protection in China, a variety of laws, regulations, norms and express regulations have been formulated in my country or in the industry to strictly restrict the emission of gasoline vapor from vehicles, and it is stipulated that oil storage depots, gas stations, etc. must be installed with oil and gas recovery devices, and meet the requirements. The emission concentration value is < 25g/cubic meter, and the oil and gas processing efficiency is > 95%.
The installation of the oil and gas recovery device applies the active adhesion method to achieve the stripping of hydrocarbons and air in the oil and gas to meet the relevant emission standards. The recycling of activated carbon is reached by the vacuum environment analysis method to achieve the goal of repeated application. The oil and gas resolved in the vacuum environment are converted into vehicle gasoline by spraying and absorbing the oil and gas in the vehicle gasoline and recycled.
The screw vacuum pump fully considers safety. Generally speaking, the operating temperature of the pump is controlled within 80 ° C for the recycling of gasoline for vehicles. In addition, the cooling circulating water cannot be guaranteed on most sites. In order to reduce the operating heat of the pump, compared with the large and medium-sized pumps with a pump efficiency of about 800m3/h, except for the pump shell collet, which is poured into the vehicle gasoline, the most effective way is to pour it into the pump cavity (at the peak of heat).) into the appropriate vehicle gasoline, and reduce the heat in the pump cavity through the evaporation and endothermic heat of the vehicle gasoline.
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