Ring Vacuum Pump Research Articles

Vakuumpumpen in der Verfahrenstechnik

AbstractVacuum pumps in chemical engineering. Applications of vacuum pumps in chemical engineering are numerous. After a general systematization of the working principles of vacuum pumps, the most important types – liquid ring vacuum pumps, sliding vane vacuum pumps, and ejectors – are discussed with regard to their development and their working principle. Attention is focussed on aspects which allow a comparison of the advantages and disadvantages of vacuum pumps. A systematic survey of the criteria leading to the selection of a certain type of pump show that these criteria may be based on the process as a whole or on environmental and safety considerations as well as economic aspects. In areas where liquid ring vacuum pumps, sliding vane vacuum pumps, and ejectors may be applied the extent to which the pumps fulfill these criteria is shown. In this context, a comparison of the liquid ring pump and the sliding vane pump is of special interest. The doubts recently publicized concerning the environmental compatibility of liquid ring vacuum pumps are shown to be groundless if the pumps are installed correctly. Great care must be taken comparing the economic aspects of liquid ring pumps and sliding vane pumps.

A study of water ring vacuum pumps. 2nd report. Theoretical analysis.

A theorical analysis of operating characteristics of water ring vacuum pumps was carried out. It is so called abnormal operation if the gas passes through the impeller channel and goes out to the peripheral space. The limiting condition of this operation was calculated. It could be concluded that the gas quantity carried over from the discharge to suction process is determined by the pressure ratio and the sealing water supply.

A study on water ring Vacuum pumps. 1st report On examination of Pfleiderer's theory.

A study on water ring Vacuum pumps. 1st report On examination of Pfleiderer's theory.

Investigations on pumping speed and compression work of liquid ring vacuum pumps

Liquid ring vacuum pumps are used to create coarse vacuum. Very limited theoretical work has been reported on these vacuum pumps. In the present work, an attempt is made to develop an equation for pumping speed as a function of free air displacement conditions, vapour pressure of the sealant liquid, pressure and index of expansion process in the system to be evacuated and index z representing the set of operating conditions. Analysis is carried out for compression work for isothermal systems. Expressions are developed for the pressure at which the compression work is maximum and its dependence on various parameters is studied. Theoretical derivations are compared with the experimental work carried out and the dependence of index z on various operating conditions is studied. The theoretical equations are also compared with theoretical and experimental studies of other investigators. The analysis presented will help in understanding the performance characteristics of these vacuum pumps.

5049. Pumping of dry air and of saturated air-water vapour mixture with liquid ring vacuum pumps: Von U Segebrecht,Vakuum Technik,29 (8), 1980, 246–252 (in Gerrnan).

5049. Pumping of dry air and of saturated air-water vapour mixture with liquid ring vacuum pumps: Von U Segebrecht,Vakuum Technik,29 (8), 1980, 246–252 (in Gerrnan).

915. Determination of gas leakage through ring gaps of liquid ring vacuum pumps: V F Lukoyanov et al,Vakuum Tekh, 2,Kazan 1970, 31–37 ( in Russian)

915. Determination of gas leakage through ring gaps of liquid ring vacuum pumps: V F Lukoyanov et al,Vakuum Tekh, 2,Kazan 1970, 31–37 ( in Russian)

916. Numerical determination of hydraulic losses in liquid ring vacuum pumps: I A Rayzman and A I Lukyanova,Vakuum Tekh, 2,Kazan 1970, 27–31 ( in Russian)

916. Numerical determination of hydraulic losses in liquid ring vacuum pumps: I A Rayzman and A I Lukyanova,Vakuum Tekh, 2,Kazan 1970, 27–31 ( in Russian)

911. Review of liquid ring vacuum pump and compressor constructions: I A Rayzman,Vakuum Tekh, 2,Kazan 1970, 161–185 ( in Russian)

When used tires are subjected to heat in the absence of air, large quantities of vapours and gases are produced. A large portion of the vapours can be condensed to oils with a yield of 55% by weight. However, the non-condensable gas phase (6% yield) is contaminated with oil droplets, tar, fine particles as well as nitrogen- and sulphur-compounds. The project objective is to develop a gas-cleaning system and design a pumping unit that can maintain the total reactor pressure below 10 kPa and burn the process gas without emission problems. A series of experiments was made in a 25 kg h−1 vacuum-pyrolysis process-development unit, for which different gas-cleaning units such as a shell and tube heat exchanger, cold traps, cyclones, demisters and filters were tested. A gas burner with a variable orifice was used to burn the pyrolysis gas efficiently. Standard stack sampling was performed to identify the flue gas contaminants. Gas burning in general was successful, but the gas-cleaning system could not remove all the contaminants in the gaseous stream. According to preliminary experimental results, an alternative promising approach is to replace the shell and tube exchanger, cold traps and filters by a liquid-ring vacuum pump.

The Water Ring Vacuum Pump with Air Ejector

The Water Ring Vacuum Pump with Air Ejector