Pumps – One fluid pumped by contact or entrainment with another – Jet
Patent
1998-11-30
2000-09-19
Freay, Charles G.
Pumps
One fluid pumped by contact or entrainment with another
Jet
417 76, 417313, 95176, 96194, F04F 500
Patent
active
061202541
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to the field of oil processing and the petrochemical industry, mainly to installations for the vacuum distillation of liquid products, crude oil for example. It and can be used particularly for the rectification of oil stock.
A vacuum system for crude oil rectification, which exploits a water steam ejector for producing a vacuum in a vacuum rectification column, is known (see U.S. Pat. No. 2,680,709, cl. 202-204, 1954).
Waste water with emulsified impurities of petroleum derivatives is formed as a result of operation of this system. Such waste water is environmentally dangerous and its purification from petroleum emulsions is a complex technical problem, requiring significant expenses.
The authors have chosen the pumping-ejector vacuum unit for distillation of liquids disclosed in RU patent No. 2048156 (M cl..sup.6 B 01 D 3/10, 1995) as the starting point for the present invention. This unit comprises for discharge of vapors and for export of a liquid fraction; separator and a pump.
In operation of this system, evacuation of vapors from the rectification column is carried out by the liquid-gas jet apparatus. The liquid-gas jet apparatus uses the liquid fraction from the rectification column as an active medium. Use of such unit substantially reduces the environmental discharge of ecologically harmful refinery waste.
The main imperfection of this system is the low efficiency of the vacuum-producing device since there is no makeup of the motive liquid during operation and the motive liquid is saturated in a short time by impurities, which negatively affect performance of the liquid-gas jet apparatus.
SUMMARY OF THE INVENTION
The technical problem to be solved by the present invention is an increase in the efficiency and productivity of the vacuum system by providing optimum conditions for the makeup of the motive liquid of the vacuum-producing device.
The problem is solved as follows. A pumping-ejector vacuum system for distillation of a liquid product, comprising a vacuum rectification column with pipelines for feed of a stock product, for discharge of vapors and for export of a liquid fraction, and a vacuum-producing device composed of a liquid-gas jet apparatus, a separator and a pump, is furnished with a jet pump. The jet pump is a component of the vacuum-producing device, in that the gas inlet of the liquid-gas jet apparatus is connected to the pipeline for discharge of vapors, the liquid inlet of the liquid-gas jet apparatus is connected to the discharge side of the pump, the outlet of the liquid-gas jet apparatus is connected to the separator, the gas outlet of the separator is connected to consumers of compressed gas, the outlet of the jet pump is connected to the suction side of the pump, the passive medium inlet of the jet pump is connected to the separator, and the active nozzle of the jet pump is connected to the pipeline for export of a liquid fraction from the rectification column. Additionally, the vacuum-producing device is furnished with an additional pump. The suction side of this additional pump is connected to the separator and the discharge side of this pump is connected to the active nozzle of the jet pump. The liquid outlet of the separator is connected to the pipeline for export of the liquid fraction from the rectification column.
The installation of the jet pump at the separator's liquid outlet and the connection of the jet pump to the pipeline for export of the liquid fraction from the rectification column provides for an adjustable and controllable process of mixing of the motive liquid and the liquid fraction from the rectification column. It is preferable to place the jet pump closer to the liquid outlet of the separator. It is also preferable to arrange delivery of the liquid fraction from the rectification column into the active nozzle of the jet pump as a medium for makeup of the motive liquid. This allows not only for refreshing of the motive liquid, but also for boosting the pressure of the motive liquid at the pump inle
REFERENCES:
patent: 2680709 (1954-06-01), Skinner
patent: 3796640 (1974-03-01), Boomer
patent: 4542196 (1985-09-01), Morris et al.
patent: 4855524 (1989-08-01), Harandi et al.
patent: 5015359 (1991-05-01), Harandi et al.
patent: 5214157 (1993-05-01), Healy et al.
patent: 5327735 (1994-07-01), Hatton
Evora Robert Z.
Freay Charles G.
Oathout Mark A.
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