Heating – Tumbler-type rotary - drum furnace
Patent
1997-09-02
1999-02-02
Walberg, Teresa J.
Heating
Tumbler-type rotary - drum furnace
239600, B05B 100
Patent
active
058656170
DESCRIPTION:
BRIEF SUMMARY
The invention relates to the art of replaceable nozzles and more particularly, to replaceable nozzles for high temperature environments.
BACKGROUND OF THE INVENTION
In the related art, fan-angle nozzles (FWD) or fan nozzles are used parallel or perpendicular to the wall that is plastered or surfaced with mortar on the inside of heat exchangers for cement cylindrical rotary kilns. The cakes of cement raw meal that regularly build up are removed by air blasts so that an optimum heat exchange process/material flow is achieved. In addition, the alternative of labor-intensive, high-risk manual removal involving the insertion of air lances or pokers through openings in the heat exchanger wall is avoided. If the mouthpiece of the fan nozzle becomes worn or eroded by chemical reactions, the large-surface cleaning effect decreases. Then, or during regular kiln maintenance, at the latest, the person setting up the heat exchanger must remove the block material and the old nozzle, weld in a new nozzle and fill the hollow chamber with fireproof cement.
SUMMARY OF THE INVENTION
The object of the invention is to provide a replaceable nozzle or a replacement nozzle system that allows nozzles to be replaced easily, particularly cleaning-air blast nozzles, for high-temperature reactors.
This object is accomplished by a replaceable nozzle or a replacement nozzle system such as an angle-fan nozzle for high temperature reactors (i.e. such as heat exchangers of cylindrical rotary kilns for manufacturing cement) that are provided with a fireproof lining. The nozzle comprises a high-temperature-resistant, metal nozzle body that at least partially penetrates the lining of the high-temperature reactor. Preferably, the nozzle includes a slotted outlet gap. The nozzle also includes a pipe that is connected to the nozzle body for supplying fluid. Preferably, the pipe connects to an external air cannon for supplying a blast of cleaning fluid. The nozzle also includes an expansion collar, particularly of elastic, high-temperature-resistant material. Preferably, the expansion collar is approximately 10 mm-thick and made of a ceramic-fiber web or glass-fiber needled felt. The nozzle further includes a nozzle block. The nozzle block is preferably conical toward the outside. The nozzle also includes a separating surface or a separating layer of high-temperature-resistant, elastic material. The expansion collar is disposed between the metal nozzle body and the nozzle block. The nozzle block ends are essentially flush with the inner lining surface and are separated by the separating surface or separating layer from a sheath in the brick lining, particularly from an envelope block, that is preferably conical toward the inside and which corresponds in shape to the nozzle block.
The invention allows the nozzle to be replaced simply from the outside without internal equipment and, possibly, even without complete cooling of the high-temperature reactor or heat exchanger.
A replaceable nozzle according to the invention thus comprises, in addition to the nozzle body that penetrates the reactor wall and the fluid supply pipe connected to the body (in any event, to the extent that a corresponding pipe section penetrates the reactor wall), a nozzle block encompassing the nozzle body along its entire circumference and at least partially along its length, which nozzle block can be inserted into the high-temperature reactor lining by means of its radial side walls so as to fit precisely, with a separating layer that serves as an expansion collar being provided between the nozzle body and the nozzle block, and another separating layer being provided between the nozzle block and the reactor lining adapted to the contour of the nozzle block, which separating layer effects a separation of the nozzle block from the reactor lining in the event of a nozzle replacement.
Whereas the nozzle block is generally manufactured prior to its installation into the reactor wall, and already encompasses the nozzle body, the sheath of the reactor lining into which the n
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patent: 1477517 (1923-12-01), Newberry
patent: 3380407 (1968-04-01), Nilsson
patent: 3735906 (1973-05-01), Zettlemoyer et al.
patent: 3784107 (1974-01-01), Rossi
patent: 3946949 (1976-03-01), Rossi
patent: 4240788 (1980-12-01), Naito et al.
patent: 4373909 (1983-02-01), Petit et al.
patent: 4451232 (1984-05-01), Ernst et al.
Jager Peter
Rappen Albert
VSR Engineering GmbH Fordertechnik
Walberg Teresa J.
Wilson Gregory
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