Fluid handling – Processes – With control of flow by a condition or characteristic of a...
Patent
1981-08-20
1984-06-05
Schwadron, Martin P.
Fluid handling
Processes
With control of flow by a condition or characteristic of a...
137 13, 137 92, G05D 1116
Patent
active
044522657
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a method and apparatus for mixing two liquids having different viscosities while maintaining substantially constant viscosity of the mixture. The invention particularly relates to mixing oils of different viscosity, above all mixing diesel oil with heavy fuel oil for feeding engines, e.g. auxiliary engines on vessels.
2. Background Art
With the increasing oil prices, it has become more and more imperative to reduce fuel costs for the operation of such auxiliary motors on vessels as normally run on diesel oil. For this purpose it has been proposed to mix low-class oils (heavy fuel oils) with the diesel oil for feeding such engines. Since these engines require an oil with a specific viscosity at a given temperature for their operation, it must be ensured that the mixing ratio is controlled in such a way that the appropriate viscosity is retained. For this purpose there has been proposed a system in which the mixing ratio is controlled by determining the temperature and viscosity of the mixture. The sensed values are taken to a computer unit, which converts the sensed viscosity value to the value applicable at the desired temperature, and with guidance therefrom sets the mixing ratio, e.g. by regulating the work of two pumps feeding the mixer with both oils, so that a substantially constant viscosity at the desired temperature is maintained.
This system has the drawback that the necessary computer unit is an expensive component. Furthermore the system requires use of mixing tanks. It is not possible to mix the two oils directly in a conduit leading to the engine.
The present invention intends to eliminate these drawbacks. The invention relates to a method and apparatus by which mixing step can be carried out in line without requiring the use of an expensive computer unit.
DISCLOSURE OF INVENTION
In accordance with the invention, the viscosity and temperature of the oil mixture obtained by mixing oils supplied by two pumps are sensed. The sensed viscosity is used to regulate a heater which heats the oil mixture such that a constant viscosity is maintained in the mixture departing from the heater. The sensed temperature is used for regulating the mixing ratio between the two oils such that a substantially constant temperature is maintained in the oil departing from the heater, suitably by actuating a variable pump which supplies one of the oils.
BRIEF DESCRIPTION OF DRAWING
The invention is described in detail with reference to the appended drawing, which schematically illustrates an apparatus for carrying out the method for mixing diesel oil and heavy fuel oil for supply to an engine.
BEST MODE OF CARRYING OUT THE INVENTION
The apparatus includes a diesel oil pump 1, on its suction side connected via a conduit 2 to a diesel oil tank, a conduit 3 with a non-return valve 4 departing from its pressure side, and a heavy oil pump 5, on its suction side connected via a conduit 6 to a heavy fuel oil tank, a conduit 7 with a non-return valve 8 departing from its pressure side. The diesel oil pump 1 is driven by a motor 9 at a variable of rate rotation, and the heavy oil pump 5 is driven by a motor 10 at a constant rate of rotation.
Both conduits 3, 7 are taken to a conduit 11 opening out in a mixer 12, in which the diesel oil and the heavy fuel oil are mixed. The mixture departs via a conduit 13, from which a return conduit 14 with non-return valve 15 goes to the conduit 6 on the suction side of the pump 5, so that a portion of the oil mixture returns to the pump 5, this pump thus operating with a mixture of newly supplied heavy fuel oil and oil mixture already produced.
The portion of the oil mixture which is not recycled flows first through a flow meter 16. The mixture is then transported via a conduit 21 by a pump 22 for taking the mixture through a heater 23. The mixture flowing from the heater 23 passes through a conduit 28. In this conduit the temperature of the mixture is measured by a thermometer 29, and its viscosity by means of a visco
REFERENCES:
patent: 3025232 (1962-03-01), Jones
patent: 3249115 (1966-05-01), Young
patent: 3383037 (1968-05-01), Vince
patent: 3434488 (1969-03-01), Talbot
patent: 3977427 (1976-08-01), Reed et al.
Schwadron Martin P.
Shay James R.
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