DE1451321B2 - AIR SUPPLY DEVICE FOR A CYLINDER FURNACE - Google Patents

Description

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The invention relates to an air supply device for a vortex furnace with a cylindrical combustion chamber, Air inlets are provided in its wall which are in communication with air distribution ducts arranged outside the wall and generate inclined air jets in such a way that a flow that rotates around the furnace axis is created.

In a known vortex furnace of this type (US Pat. No. 723 310), the air inlets prevail part of the furnace wall radially. In the combustion chamber lining of the furnace wall are in connection ; In the air inlets after a rope bent recesses are provided that the air with a tangential component to enter the combustion chamber and the combustion gases in a move in a circular motion.

However, these known air supplies cannot be exchanged during operation; it is also not possible to change the exit direction of the air jet.

The invention is based on the object of creating an air supply device with air nozzles are exchangeable from outside the furnace and whose air flow direction can be adjusted from the outside can; in particular, the air flow exiting the nozzles should be strongly inclined towards the furnace wall could be.

To solve this problem, according to the invention, it is envisaged that the air inlets from into the Wall of the vortex furnace used and formed into the combustion chamber protruding pipe socket are that the protruding into the combustion chamber ends of the pipe socket with respect to the jet direction adjustable and replaceable nozzle bodies are provided and that in the air distribution lines The service openings assigned to the pipe socket and accessible from the outside are provided.

When the air supply is designed as a pipe socket protruding into the combustion chamber these can be permanently walled into a thick furnace wall as a fixed nozzle carrier. The \ on Outside the possibility of exchangeability of the nozzles even during operation, the air supply can deny the be adapted to the respective operating conditions and in particular to different types of fuel. Another advantage is that the radial, continuous air supply enables simple installation of the pipe socket in the brickwork and the air in the pipe socket is preheated.

In the case of a furnace for melting metals, it is known, radially from the outside through the furnace wall and to provide nozzles with angled outlet end passing through their brickwork, which 'on are rotatable on the outside (US patent 594 S7S). Replacing the nozzles during operation is not possible with this known furnace.

There is also an air supply device for boiler firing known, in which the combustion chamber is surrounded by an annular channel. from the tangential Nozzles directed inwards to form an imaginary circle in the middle of the fire box (German patent ISl S96). The ring channel with the nozzles is completely enclosed by the masonry. A change in the direction of exit of the air jets or other influencing of the air supply is not possible with this known furnace. Finally, there is also an air inlet in the Known combustion chamber of a boiler in which nozzles are kinked by an air duct outside the combustion chamber protrude into conical recesses in the furnace wall. The direction of discharge of the nozzles can be changed by turning (German patent specification 869 838). The Düäcm iiiuu are in operation exchangeable, nor is a rotating flow of air jets intended here.

The pipe sockets are advantageously distributed over the circumference of the wall of the vortex furnace that the The jet emerging from a nozzle body hits the wall in the vicinity of the next in the direction of rotation Pipe socket is directed. This removes the rotating, hot gas column from direct contact kept away with the lining and spared the latter.

Each pipe socket is expediently designed to be cylindrical or slightly conically tapering downstream. If the vortex furnace is designed vertically, the pipe sockets are useful for good mixture formation arranged in several vertical rows, with all pipe sockets of a vertical row with a common Air distribution line are in communication.

The invention is illustrated more schematically below with reference to the hand Drawings explained in more detail using an exemplary embodiment.

F i g. 1 shows a cross section through one according to vortex furnace provided with air injection nozzles according to the invention;

Fig. 2 is a horizontal section along the line II-IlinFig. 1;

F i g. 3 is an air chamber shown on an enlarged scale.

In the embodiment shown, the furnace has a vertical, cylindrical combustion chamber 1 with refractory lining. A combustion device 2 with underfeed feed and a conical grate is placed in the lower part of the furnace. At the top of the furnace near the Ceiling 3 a circular distribution line 4 is arranged. This line leads a number of vertical air distribution lines 5 to combustion air. With these lines in turn a number of air chambers 6 are connected, which radially to the Center of the vortex furnace. Behind each chamber there is an air distribution duct in the outer wall provided operating opening 7 arranged, which a setting or an off Exchange of one arranged on the section of the air chamber 6 protruding into the furnace interior Nozzle body 11 allows. Each air chamber consists of an essentially cylindrical one or slightly conical pipe socket 8 with a flange 9 provided at the outer end The end of the pipe socket 8 is a seat 10 arranged for the nozzle body 11. This seat 10 is provided in the chamber that the axis of the Nozzle opening an angle λ with the longitudinal axis

the chamber includes. The pipe socket extends somewhat beyond the inner surface of the wall and the angle χ is preferably chosen so that the emerging air jet is directed onto the following row of nozzles. By this special arrangement and by the position of the chamber 6, the rotating gas column is kept at a distance from the furnace wall, so that the lining is protected. Since different fuels have different angles of repose, changing the direction of the air

, 5 flows desirable if a different fuel is used. You can do that by the nozzle body rotates so that the air is blown obliquely downwards or upwards. As alternative one can, depending on the requirements of the

, o ckn fuel also against each nozzle body LI exchange another whose angle λ is different or which has a larger or smaller outlet opening 12.

It is immaterial to the invention like that

"■ Fuel is poured into the combustion chamber. An

"Rush to feed the fuel from below In the middle of the grate, dusty fuel is blown into the furnace through openings in the side wall will'. For systems in which the indoor air

fed through the grate. is through the Air supplied to air chambers, secondary air.

1 sheet of drawings

Claims (4)

Patent claims: 1. Air supply device for a vortex furnace with a cylindrical combustion chamber, in the wall of which air feeds are provided, which are in connection with air distribution lines arranged outside the wall and generate air jets inclined in such a way that a flow that rotates around the furnace axis arises, d 3 - ig characterized in that the air inlets are formed by pipe nozzles (8) inserted into the wall of the vortex furnace and protruding into the combustion chamber, that the ends of the drill nozzles (8) protruding into the combustion chamber are given away with nozzle bodies (11) that are adjustable and replaceable with respect to the jet direction and that in the Luftverteilleitur _a 2n (5) the pipe socket (8) assigned, externally accessible service openings (7) are provided. 2. Air supply device according to claim 1, dac ireh characterized in that the pipe ^ .tzen (8) are distributed over the circumference Jer wall of the vortex furnace that the au ^c a nozzle body (11) exiting jet on the wall near the in Direction of rotation following the pipe socket (8) is directed. 3. Air supply device according to claim 1 or 2, dadu, jh characterized in that each pipe socket (8) Cylindrical or 5'rom that is slightly conically tapered. 4. Air supply device n: - h one of claims 1 to 3, characterized in that with a vertical design of the vortex furnace, the pipe sockets (8) arranged in several vertical rows and that all pipe sockets (8) of a vertical row with a common air distribution line (5 ) stay in contact. 40