Reciprocating pump in chemical plant

Vacuum pump is used to pump air from the equipment or production system to make the equipment or production system work under vacuum. The main function parameters of vacuum pump are: pumping rate, limit vacuum degree, shaft power and speed, etc. The pumping rate of vacuum pump refers to the volume of gas that can be pumped out in unit time (m3 / h). The limit vacuum degree refers to the vacuum degree that the pump can reach.

The vacuum pumps commonly used in chemical production are: reciprocating vacuum pump, water ring vacuum pump and eruption pump.

Vacuum pump is characterized by a large pressure ratio. For example, in order to reach 95% vacuum, the nominal pressure of suction is 0.005MPa, while the exhaust pressure is 0.1MPa, and the pressure ratio is 20. Because of the large pressure ratio, the gas in the residual clearance volume will occupy a large volume after expansion, which greatly reduces the suction volume and the useful utilization rate of the cylinder is very low.

In order to deal with the above problems, several grooves are generally opened on the cylinder wall at both ends of the cylinder, which are longer than the thickness of the piston. When the piston works to the dead center position, it is used to balance the pressure of the cylinders on both sides of the piston. For example, when the piston works to the left dead center, the exhaust of the left cylinder is finished, and the residual gas with high pressure in the clearance volume is left, and the suction in the right cylinder is finished, and the pressure is low. Because of the connection effect of the groove, the gas pressure in the clearance volume of the left cylinder decreases. In this way, when the piston returns to work, the volume occupied by the expansion of residual gas is greatly reduced, and the suction volume is increased. The same is true of the piston working to the right dead center.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

Selection of vacuum system

Under its working pressure, the vacuum pump should be able to discharge all the gas in the process of vacuum equipment process, and recognize the vacuum volume of the system. Check the time required to acknowledge the required vacuum, the flow resistance and leakage of the vacuum pipe. Considering the requirement of vacuum degree, adhere to the pumping rate of vacuum demand under certain process requirements after reaching the required vacuum degree; correctly combine the vacuum pump and recognize the appropriate stage ratio between the main pump and the previous stage pump; when planning the vacuum pipeline, the short and thick pipeline should be selected as far as possible, and the general pipe diameter should not be less than the inlet of the true empty pump.

In the planning of the vacuum system, the sealing performance of the system should be carried out to reduce the leakage rate of the system. Appropriate sealing data should be selected. The practical pumping volume flow of liquid ring vacuum pump is related to the working liquid. The higher the working fluid is, the higher the steam partial pressure is

The worse the condensing effect of the steam at the inlet of the pump is, the smaller the volume flow of the vacuum pump is. It is suggested to select the working fluid with low full vapor pressure. The temperature of the working fluid should be controlled together. As for the gas with high freezing point, such as glycerol, octamethylcyclotetrasiloxane and hexamethyltrisiloxane, etc., should be removed. In order to avoid these gases from entering roots pump and agglomerate and accumulate, it is necessary to move the temperature of roots pump, such as heating nitrogen; In the vacuum system planning, new skills should be selected to achieve active control and interlock protection.

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