Heating – Heat generating means heats heat storage mass of solid material – Mass is solid fluent heat carrier
Reexamination Certificate
1999-11-12
2001-02-06
Ferensić, Denise L. (Department: 3749)
Heating
Heat generating means heats heat storage mass of solid material
Mass is solid fluent heat carrier
C432S206000
Reexamination Certificate
active
06183247
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to heating equipment allowing the use of particle shaped fuel of various materials such as pellets produced from starting materials of wood and the like.
BACKGROUND OF THE INVENTION
Several such types of equipment are known and the present invention aims at using an arrangement for burning brushwood waste. Two cylindrical units are used here, arranged concentrically so that a core area and an annular space are formed. Both the wails forming said unit are perforated and the annular space is filled with brushwood waste which is fed into the space from below. The brushwood waste is ignited and combustion is maintained by air being allowed to flow through perforations in the two pipes. This known arrangement provided the impulse to develop a completely new type of heating equipment for burning pellets.
SUMMARY OF THE INVENTION
The present invention has a central body with a flame outlet, the central body having coherent walls and being closed except for the flame outlet. The wall of the central unit is perforated. A wall is arranged concentrically outside said central unit and spaced from the wall of the central unit so that a space is formed, the outer walls of said space also being perforated. The space is filled with pellets and both units are subjected to medium directed towards the core unit. Initially the medium has elevated temperature so that the fuel is ignited. Once this has occurred the temperature of the medium supplied is reduced. Fuel is gradually supplied to the space around the central unit by a dosing device. The central unit and its surrounding outer wall can rotate about its axis when only one directed air jet is used. It is obvious that said air jet can be supplied to the central unit in a number of different ways and that rotation can thus be avoided. One way of avoiding rotation is for the outer wall to be surrounded by annular pipes, these pipes being arranged in rings around the outer wall and following each other so that substantially the entire outer wall is covered by pipes lying one on top of the other, each pipe also communicating with a perforation inside the wall. Each pipe is connected to a unit for supplying medium. The space for pellets, the outer wall of which is perforated, can cooperate with a closed wall situated outside the perforated wall of the pellet space and, together with this wall, forms a closed space with the exception of an inlet for medium. By means of transverse walls spaced from each other, the closed space can form a number of pipes situates one above the other and having substantially rectangular cross section, said pipes having a perforated wall. This rotation can be avoided if the outer wall is surrounded by annular pipes. These pipes are arranged as rings around the outer wall. The pipes are arranged one after the other so that substantially the entire outer wall is covered by pipes lying one on top of the other. Each pipe also communicates with a perforation inside the wall. Each pipe is connected to a unit for supplying medium. The supply of medium is controlled by means of a distributing unit connected to a fan. Said fan is also connected to a fuel-supply channel so that medium can be supplied to the central space via a valve in the transport channel. A number of openings are arranged around the edge of the flame outlet, said openings being connected to a fan which supplies medium to return uncombusted particles to the combustion chamber. The flame outlet is in communication with a container transferring heat from the flame to a heat-absorbing medium such as water, arranged in a container. This container may be connected, for instance, to various units which conduct the heat further to a heating system in which the heat is waterborne, for instance. The space transferring heat to the heat-absorbing medium is in communication with a flue-gas outlet such as a chimney.
For said heating equipment to function optimally a control unit is required which communicates with the chimney, with a dosing device, with both fans, with the distributing unit, and with a valve arranged on the central unit, said valve also acting as distributing means for fuel. A device is also connected to the control unit which reacts when the fuel is ignited and a device to indicate the temperature of the heat-absorbing medium.
All units in the equipment which are subjected to high temperatures shall be made of materials resistant to said high temperatures and a suitable material may be ceramic material or the like.
REFERENCES:
patent: 2740619 (1956-04-01), Lynch
patent: 2751211 (1956-06-01), Begley
patent: 3248206 (1966-04-01), Apple et al.
patent: 4069107 (1978-01-01), Koppelman et al.
patent: 5522156 (1996-06-01), Ware
Dennison, Scheiner. Schultz & Wakeman
Ferensić Denise L.
SL Varmeekonomi
Wilson Gregory A.
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