Gas and liquid contact apparatus – Contact devices – Rotating
Patent
1996-04-18
1997-12-30
Miles, Tim R.
Gas and liquid contact apparatus
Contact devices
Rotating
3663302, 366306, 3661711, 3661721, B01F 304
Patent
active
057026467
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a mixing head for mixing fluids, in particular various gases and/or liquids in a hot or cold environment.
EP-0 344 498 A2 discloses an impeller where, as alternative to conventionally used bucket wheels or blower wheels revolving in a housing, chain-like link elements are used for generating a rotation gas stream. Such blower in particular is used in the pneumatic transportion of dust, chips and cuttings such as accumulate in wood and plastic processing. Such blower also can be used in the field of heating, for example for flue gas conveyance, and the chain-like link elements serve in particular for the purpose of reducing cleaning of the blower, especially if the gas to be conveyed is strongly loaded with dust. In such known blower it is furthermore suggested that a deflecting surface oppose the drive side to prevent gases inflowing centrally from escaping axially. This ensures that the gas stream through the blower must be moved into the rotation path of the rotating link chain so that a mixing of the gas stream results, in particular by being swirled by the chain-like link elements.
Such movable chain-like link elements however can tear, particularly during the starting phase of rotation, or they can become jammed one against the other. Also, with vertical mounting of the link head, during a starting phase until the chain rings have become opened, considerable loading of motor bearings occurs since the chain rings, until they are completely opened, are largely imbalanced. Furthermore no possibilities for adding further fluid components are provided.
EP-0 473 618 B1 describes a similar blower which comprises a blower wheel or impeller with a central hub and elements fastened thereon and movable with respect to one another. Such elements are in the form of chain pieces in order to achieve a spiral or worm-shaped gas stream in a device for combusting bio or solid substances.
EP-0 525 711 A2 also discloses a device for the combustion of bio or solid substances by a channel and a similar link head fan whose outlet is directed into the interior of a gas or fire tube.
A mixing device which supplies an axial air stream against the direction of flow of a spiral-shaped rotating gas stream of wide area is known from EP-A0 340 859 A2. As is the case with known mixing devices, however, such device is insufficient or lacking with respect to ability to change mixing components.
SUMMARY OF THE INVENTION
It is the object of the invention to provide a dynamically operating mixing head which can be adjusted to change mixing tasks in order to achieve intensive thorough mixing and homogeneous mixtures without having to accept the disadvantages in moving parts.
This object is achieved by provision of a mixing head including an impeller achieving axial flow positioned before an impeller achieving radial flow, in the stream direction.
Such arrangement provides an axial drawing-in of the fluid to be transported as well as also a radial acceleration thereof, thus providing intensive swirling. Through this combination of impellers achieving axial flow with radial flow, the blades of which are preferably fastened on a common hub, an effective through-mixing results which can be achieved for various gases and/or liquids, e.g. the mixing of additives and air can be achieved sufficiently in the area of a housing of the head. Thus, a second gas component can be supplied through an admixing port disposed on a front face with the drawing in taking place by means of the axial flow impeller. This means that the mixing device can also be used in installations which are not operated at underpressure. On the other hand, outside of the region of rotation of the radial flow impeller, i.e. essentially at the peripheral boundary of the mixing head housing, several nozzles can be provided, for example for adding liquid additives so that several components can be mixed into the carrier fluid which, in general, is air.
A stationary deflection hood is disposed in the direction of flow after or
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