Hot burning nozzle with a change pipe

Details Hot burning nozzle with a change pipe Hot burning nozzle with a change pipe

1997-07-17

1998-11-24

Walberg, Teresea J.

Heating

With cleaning means for apparatus

432 2, 1101825, F27D 2300

Patent

active

058398937

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
This invention relates to hot burning nozzles.
2. Description of the Prior Art
The use of hot burning nozzles for detaching cakings in industrial furnaces, such as cement kilns and the like, has proven useful for years. Hot burning nozzles made, for example, of casting material are embedded in openings in the masonry of an industrial furnace and backfilled with refractory material so as to ensure a reliable seat in the masonry. The end of the hot burning nozzle protruding outside the furnace is normally welded for attachment and blowback protection to a box mounted on the furnace's outside wall through which the hot burning nozzle protrudes and which is in turn welded to the outside casing of the furnace or chambers which is normally made of a metal material. The hot burning nozzle as such embodies a mouthpiece protruding into the furnace, and an outside piece protruding outside through the furnace wall to be connected with an air blast device, the two single parts being interconnected in a way incorporated into the material, i.e. by a weld. This weld is normally located in the masonry with conventional furnace wall thicknesses and known hot burning nozzles. By reason of chemical components of the masonry this can lead to negative influences on the weld which lead to accelerated corrosion and thus to reduced service life of the hot burning nozzles. It is very troublesome to change a corroded or worn-out hot burning nozzle of this kind since it is installed directly in the masonry and the furnace masonry must be broken open, which is time-consuming and expensive.
In order to remedy these disadvantages one eventually began replacing the above-described weldment with hot burning nozzles wherein the piece of pipe protruding outside beyond the furnace wall is integrally cast on the mouthpiece protruding inside the furnace. Although such a construction avoids a corrodible weld within the masonry, the problem remains that it is extremely troublesome to replace worn-out hot burning nozzles. The masonry must still be broken open around the hot burning nozzle and the outwardly protruding piece of pipe of the nozzle must be burned away from the attachment box mounted on the furnace's outside wall. In addition, with this hot burning nozzle, as with the first mentioned one, one must remove and replace the entire device, including the mouthpiece and the outwardly protruding pipe, for connection with an air blast device, even though the main wear in hot burning nozzles normally occurs on the mouthpiece directed toward the interior of the furnace so that it would normally suffice to replace this mouthpiece to restore the operability and efficiency of a hot burning nozzle.
These findings led to the development of hot burning nozzles in a change box (EP 555 725 A1) wherein the mouthpiece of the hot burning nozzle and an optional intermediate piece for connection with an outwardly protruding connection pipe are received within a change box embedded firmly in the furnace masonry. The change box is sealed from the furnace's outer side with a screwed plate which is provided with a pipe protruding therethrough for connecting the hot burning nozzle with an air blast device and fixes the mouthpiece and an optional intermediate piece of the hot burning nozzle in the change box in the installed state. However, the advantage of extremely simple replacement of worn-out hot burning nozzle elements in this concept is opposed by a very high weight of the hot burning nozzle mouthpieces to be inserted into the change box, which is due to the fact that the hot burning nozzle mouthpieces to be inserted into the change box must be provided with suitable stop surfaces, such as flanges and ribs, to ensure a reliable seat within the change box and absorb the high blowback forces occurring during operation of the hot burning nozzles. The advantages are opposed by the high weight of the spare parts which makes it difficult to handle these parts during replacement, apart from the fact that the

REFERENCES:
patent: 3166621 (1965-01-01), Carlson
patent: 3558119 (1971-01-01), Demalander
patent: 4586895 (1986-05-01), Battles
patent: 5178819 (1993-01-01), Schoennahl

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