Dry screw vacuum pump is widely used in which industries

With the development of industrial production, people have higher and higher requirements on the vacuum system. The appearance of dry screw vacuum pump has replaced the traditional vacuum system, which has great market competitiveness and development potential. So dry screw vacuum pump widely used in what industries? Do you know the application of dry screw vacuum pump? Let's learn about it.
Dry screw vacuum pump is used for solvent recovery in pharmaceutical industry
The use of solvent crystallization process of raw materials, generally after the crystallization of filtration, washing and vacuum boring. The moisture content is generally 20% ~ 200%. The solvent contained in the wet materials is generally flammable, explosive, toxic and harmful medium. They are removed by the vacuum unit in the boring process.
Traditional wet vacuum system in choose roots - liquid ring vacuum pump unit, liquid ring pump sealing fluid in operation will dissolve or absorb part of the organic solvent, the separation of waste gas in the vapour liquid separator and a high concentration of organic waste liquid, the two parts are processing demand, this has not only this part cannot be energetic to recover solvent, and make the enterprise operation capital to add, more bring battle for health safety and environment; And use dry vacuum cooling system, can make the boring process of organic solvent in the exhaust lateral condensation, complete of solvent recovery, and waste water zero discharge of liquid waste, because of the screw pump pump cavity medium without any other process, internal appearance all adopt coating anticorrosive measures, both energy saving and environmental protection, no liquid waste processing problems, solvent can recover all. So screw vacuum pump has become the best choice in this field.
Dry screw vacuum pump is used to recover gasoline vapor in petrochemical industry
The dry screw vacuum pump is a key equipment in the gasoline vapor recovery equipment, the gas is simply distilled gasoline vapor, the primary component is C4, C5, C6 and other gasoline vapor.
General requirements of the pump running temperature under 80 ℃, but only relying on the pump body jacketed cooling can't make the pump running down to such a low temperature, the other at the scene of the most cannot supply cooling water, can supply coolant is gasoline; In order to reduce the operating temperature of the pump, in addition to injecting gasoline into the jacket of the pump body, the most useful method is to inject an appropriate amount of gasoline into the pump chamber (at the highest temperature) to reduce the temperature of the pump chamber by transpiration and heat absorption, as shown in FIG. 17.
Because the screw vacuum pump in the process of oil and gas recovery, condensed gasoline will be stacked in the pump exhaust, this phenomenon will form abnormal liquid pump oscillation and noise, and must be timely discharge, to this end can adopt the following three ways to improve.
Pump exhaust pipe downward tilt, exhaust pipe position lower than the pump exhaust position.
At the lowest position of the pump exhaust or silencer, a circulating pump is installed to eliminate fluid accumulation.
At the exhaust port of the pump, the one-way valve is installed to prevent the condensate from flowing into the pump chamber due to siphon when the pump is suspended.
Dry screw vacuum pumps are used for space simulation
Because the space is imitate the equipment it is pumped container from several thousand cubic meters to tens of thousands of cubic meters, the volume of vacuum degree change from tens of thousands of Pa to several Pa, smoke and gas contains a lot of water vapor or part of the nitrogen oxide, so the first problem is pre vacuum vacuum system problems, if choose the traditional plunger pump as a backing pump has the following problems:
Firstly, the slide valve pump operates for a long time under high inlet pressure. Because the airflow has effects, the oil injection phenomenon is very serious. Firstly, it wastes a lot of expensive oil; secondly, it pollutes the environment.
Because the pumped gas contains a lot of water vapor or nitrogen oxides, these gases once into the pump will make the vacuum pump oil emulsification deterioration, oil sealing damage, leading to the decline of vacuum function, and even make the pump destroyed;
The number of required equipment pump is large, and the sliding valve pump oscillation, noise is also large;
Screw vacuum pump has become the first choice for large space to imitate vacuum system because of its advantages such as no oil, high pumping speed, small oscillation and low noise. In addition, in order to improve the pumping speed and limit vacuum of the vacuum unit and correspondingly reduce the size of the screw pump, it is generally used to select a roots pump and screw vacuum pump in series composed of two units or two roots pump and screw vacuum pump in series composed of three units. To prevent particle impurities from entering the pump, the vacuum unit is equipped with an inlet filter with a precision of 50 m.

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