Agitating – Having interrelated feed and discharge means – Plural feed or discharge means
Patent
1982-06-28
1985-02-12
Jenkins, Robert W.
Agitating
Having interrelated feed and discharge means
Plural feed or discharge means
366136, 366159, 366160, 366182, B01F 510
Patent
active
044987846
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a method of continuous mixing and homogenization of a main substance with at least one additive substance, liquids in particular, in which method the substances are mixed together to constitute a homogenuous admixture. Further, the invention is in respect of a device for carrying out the method.
More particular, the invention relates to a method and a device for continuous mixing and homogenization of oil with water as an additive.
When speaking of problems involved with the burning of heavy oils one encounters primarily two types of problems. For one thing, the ones who get into daily touch with furnaces experience problems with furnace clogging, soot, operational brake-down, coke, residues and other operational problems, for another people worry about environmental injury, dust discharge, sulphur discharge and other environmental problems.
By emulsifying water in the oil in a proper manner, a second distribution is obtained when the oil spray enters the combustion chamber of a furnace. Extensive measurements have shown that the dust discharge has been reduced by more than 90% and at the same time in a plurality of the cases the soot removal periods have been prolonged from each fortnight to once each half year. Consequently, a next to complete combustion of the emulsified fuel is obtained.
The burners may be fed with such emulsified fuel in a plurality of manners. Obviously it would be most convenient if the oil suppliers could deliver an oil which is already emulsified with water in a correct manner. However, an emulsion oil-water is not entirely stable, wherefore this procedure is not be considered as a possibility.
According to another method, the water is emulsified into the oil centrally for a boiler plant, i.e. an apparatus common to all boilers and burners is installed somewhere in an oil distribution circulation loop. An apparatus is available on the market which is designed to be installed according to this principle. This apparatus functions in such manner that the oil is brought to a suitable pressure (7-8 bar) by a pump, the pressure of the water being increased in a corresponding manner. The two liquids are then sprayed against each other by each passing a number of mutually opposite nozzles. After having been treated in this manner, the emulsion flows to a container, the volume of which is about 10% of the top capacity of the apparatus per hour. The container has a connection to the atmosphere, the gauge pressure being zero. (In consequence hereof, the temperature of the oil cannot be allowed to surmount abount 70.degree. C., this with respect to the light components of the oil, and under no circumstance not surmount 100.degree. C. with respect to the boiling point of the water.) A centrifugal pump is arranged within said container for repressurizing the oil and transporting the emulsion to the burners. This pump is over-dimensioned to deliver an overflow of emulsion, thus operating as a means for dispersing and homogenizating the water in the oil. This centrifugal pump of the apparatus operates continuously, the two other pumps, however, operating intermittently to fill up the container. When the container is being emptied, the oil and water pumps are at rest. The oil and water pumps are controlled by separate level monitors in the container, alone or in combination with a timer.
According to still another method, emulsifying means are arranged for each burner. Said means will have to be inexpensive in order to be of interest. As a rule, in an installation of this kind, one or more nozzles are installed in the oil supply tube, water being ejected into the oil passing by. The number of operating nozzles is controlled by limit switches combined with the control motor of the burner. This construction results in a poor dispersion and distribution of the water within the oil, and in addition thereto the water content of the emulsion will vary with load due to a step-wise admixture of the water.
It is an object of the present invention to solve the problems touched abov
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Bernhardsson Goran
Jargell Tomas
Dahlberg Arthur D.
Jenkins Robert W.
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