Pumps – One fluid pumped by contact or entrainment with another – Diverse pumps
Reexamination Certificate
1999-02-17
2001-06-12
Freay, Charles G. (Department: 3746)
Pumps
One fluid pumped by contact or entrainment with another
Diverse pumps
C417S313000
Reexamination Certificate
active
06244827
ABSTRACT:
The invention pertains to the field of jet technology and essentially relates to plants for evacuation and compression of gaseous mediums, used for example for distilling various liquid products.
BACKGROUND
An apparatus for compression of various gaseous mediums is known, which comprises a liquid-gas ejector, a pump connected through its discharge side to the liquid inlet of the ejector, and a separator with a pipe for discharge of compressed gas (see SU, certificate of authorship 1373906, cl. F 04 F 5/54,1988).
This apparatus is able to compress various gases using energy of a liquid medium, but it is unable to provide a vacuum in a source of the evacuated gaseous medium. The latter limits the range of application of the apparatus.
The closest analogue of the apparatus introduced in the invention is a pumping-ejection plant, which comprises a source of an evacuated gaseous medium, constituting for example a rectifying column with pipes for feed of a stock product and for discharge of an evacuated gaseous medium (gas-vapor phase) and at least one liquid fraction, and a vacuum-producing device, which is composed of a liquid-gas ejector, a pump and a separator with a pipe for discharge of compressed gas (see RU, patent 2048156, cl. B 01 D 3/10,1995). The gas inlet of the ejector is connected to the pipe for discharge of an evacuated gaseous medium and the discharge side of the pump is connected to the liquid inlet of the ejector.
This apparatus provides a vacuum in the source of the evacuated gaseous medium and compresses the evacuated gaseous medium. However, this apparatus does not ensure complete condensation of easy-condensable components of the evacuated gaseous medium prior to arrival of a gas-liquid mixture formed in the ejector in the separator. This hampers the separation of mediums in the separator and results in the accumulation of dissolved gases in the liquid medium. All of the above reduce the ejector's capacity.
SUMMARY OF THE INVENTION
The present invention is aimed at an increase in operational reliability of the pumping-ejection apparatus by reducing the content of dissolved gases in the liquid medium fed into the ejector's nozzle.
The problem is solved as follows. A pumping-ejection apparatus including a vacuum-producing device, which has a liquid-gas ejector connected through its gas inlet to a pipe for delivery of an evacuated gaseous medium, a pump, whose discharge side is connected to the ejector's liquid inlet, and a separator with a pipe for discharge of compressed gas, is furnished with a condenser, a jet pump and an additional vacuum-producing device. This additional vacuum-producing device has a boosting liquid-gas ejector, an outlet separator, an additional condenser and an additional pump. The evacuated medium inlet of the jet pump is connected to the separator, the outlet of the jet pump is connected to the suction side of the pump, the motive medium inlet of the jet pump is connected to the discharge side of the pump. The inlet of the condenser is connected to the ejector's outlet and the outlet of the condenser is connected to the separator. The gas inlet of the boosting liquid-gas ejector is connected to the pipe for discharge of compressed gas, the liquid inlet of the boosting ejector is connected to the discharge side of the additional pump and the outlet of the boosting ejector is connected to the inlet of the additional condenser. The outlet separator is connected to the outlet of the additional condenser and to the suction side of the additional pump.
The discharge side of the pump can be connected to the additional condenser and to the condenser.
Availability of the additional vacuum-producing device, jet pump and condensers optimises the processes of evacuation of a gaseous medium by a motive liquid, mixing of the two mediums and separation of the liquid and gaseous medium, which take place during operation of the apparatus. Additionally, delivery of the degassed motive liquid into the nozzle of the liquid-gas ejector is provided.
Experiments have shown, that adequate passage of processes of discharge and compression of the gaseous medium and mixing of the motive liquid with the evacuated gaseous medium are very important.
The availability of the condensers, jet pump, additional pump and boosting liquid-gas ejector provides complete mixing of the motive liquid and evacuated gaseous medium with simultaneous compression of the gaseous medium prior to entry of the mediums' mixture into the separator. As a result, it becomes possible to achieve nearly complete condensation of easy-condensable components of the evacuated gaseous medium in the motive liquid. This reduces loading of the separators. Availability of the jet pump at the suction side of the pump ensures operation of the pump in an optimal mode completely excluding the possibility of cavitation regardless of the mode of apparatus operation, i.e. regardless of the pressures in the separator and pipe for delivery of the evacuated gaseous medium. The apparatus with the additional vacuum-producing device comprising the boosting liquid-gas ejector, additional pump, condenser and outlet separator has an extended range of operational capability because a reduced pressure in the separator and consequently at the liquid-gas ejector's outlet results in a deeper vacuum available in a source of the evacuated gaseous medium, for example in a rectifying column or any other evacuated object. The reduced pressure in the separator makes for more intensive degassing of the motive liquid. This process becomes adjustable since the required degree of degassing can be controlled by varying pressure in the separator. This can be used as an additional way for adjusting the mode of operation of the whole apparatus. The connection of the discharge side of the pump to the additional and main condensers and connection of a pipe for delivery of a liquid fraction to the main condenser (the latter takes place if the evacuated object is a rectifying column) allow adjustment of the regime of forming of the liquid-gas mixture during mixing of the motive liquid and evacuated gaseous medium. Renewal or change of the motive liquid both in the main and additional vacuum-producing devices is also possible in this case.
So, due to the described improvements the introduced apparatus exhibits an increased operational reliability.
REFERENCES:
patent: 3551073 (1970-12-01), Petrovits
patent: 3701264 (1972-10-01), Newton
patent: 4761970 (1988-08-01), MacCracken
patent: 5343711 (1994-09-01), Kornhauser et al.
patent: 5980698 (1999-11-01), Abrosimov et al.
patent: 2048156 (1995-11-01), None
patent: 559098 (1977-07-01), None
patent: 1373906 (1988-02-01), None
patent: 1588925 (1990-08-01), None
patent: 1733714 (1992-05-01), None
Doubinski Anatoli M.
Popov Serguei A.
Freay Charles G.
Oathout Mark A.
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