Fluid sprinkling – spraying – and diffusing – Processes – Vibratory or magneto-strictive projecting
Patent
1983-07-13
1986-04-08
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Processes
Vibratory or magneto-strictive projecting
239 7, 239 8, 239102, 239104, 23921425, 239290, B05B 1706
Patent
active
045807230
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method for atomizing dispersions or solutions containing particles wherein the dispersion or solution is discharged from a nozzle.
It is previously known to utilize an acoustic effect e.g. ultrasound in order to atomize and scatter oils and suspensions with low particle contents and to affect mass and heat transport in the atomized or scattered suspension or solution, the so-called spray. When prior art technique is applied the vicosity of the dispersion or solution as well as the particle content thereof must be limited in order to avoid erosion and clogging in the conduits for supplying the dispersion or solution. The particular distribution in the spray moreover will not be homogenous, which results in an unsatisfactory mass and heat transport in the reaction zone, and the reason thereof among other things is that particles which are not separated in the suspension by the particles being charged or by applying other prior art technique, tend to form agglomerates at the atomization proper. When dispersions or solutions having a high particle content are being atomized other technique has been resorted to and one has utilized e.g. pressurized air nozzles and rotary nozzles but the experience from long-term tests with such nozzles is limited; there are however indications of dramatical erosion attacks already after short-term operation.
There is a need of providing equipment which can be used for atomizing dispersions having a high dry content, and the purpose of the invention is primarily to provide a method of the kind referred to above, by which a homogeneous fine-particulate drop size distribution in atomizing suspensions or solutions containing particles can be obtained in order thus to provide a specific surface as great as possible for chemical reactions such as combustion or for strictly physical processes such as evaporation of water in spray dryers. The rate of these processes is often governed by the molecular gas diffusion around the individual particles. E.g. when coal powder is being burnt, the transport of the oxygen to the coal particle through the vaporization and reaction products emitted from the oxidation of the coal particle is of great importance for the reaction rate.
The purpose mentioned above is achieved according to the invention by the method having obtained the characteristics appearing from claim 1.
The acoustic effect influences positively the molecular diffusion in drying processes and facilitates the oxygen transport to the fuel in oxidation processes.
As a consequence thereof there is obtained a particularly favourable influence on the drop sizes of the developed spray at a lower dependence of the viscosity and density of the atomized fluid. Moreover, there is obtained a positive influence on the molecular diffusion in drying processes, and oxygen transport e.g. to a coal fuel in oxidation processes is facilitated.
In order to explain the invention in more detail reference is made to the accompanying drawings in which
FIG. 1a and FIG. 1b together is an axial sectional view of a burner for a coal water dispersion.
Referring to FIG. 1, the burner disclosed therein comprises a fixedly arranged tube 10 which is mounted in a front plate 11 by means of which the burner can be mounted in a combustion compartment, and is surrounded by a tubular casing 12 which is also mounted in the front plate and has an inlet aperture 13. The tubular casing 12 is connected with the tube 10 by means of vanes 14 which can be angled in relation to the axial direction in order to form a turbulator. In the tube 10 arranged coaxially therewith, a tube 15 is rotatably mounted by means of bearings 16, and this tube extends through a box 17 at the bottom of a socket 18 mounted in the tube 10, which surrounds the tube 15 spaced therefrom such that an annular passage 19 is provided between said tube and the socket. A tube 20 arranged as a lining in the socket 18 is rotatably mounted in the socket by means of bearings 21 and is connected by webs 22 to the tube 15 so as to
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Fluidcarbon International AB
Forman Michael J.
Kashnikow Andres
Ljungman Nils H.
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