US2634115A - Head for regenerative furnaces - Google Patents

Description

April-7, 1953 F. BARTU E TAL 2,534,115

HEAD FOR REGENERATIVE FURNACES Filed July 31, 1947 Ffgd W 7 l a/ll MY OGAJAWW Patented Apr. 7, 1953 HEAD FOR REGENERATIV E FURNACES Franz Bartu and Hans Steyrleitner, Millstatt, Austria, assignors to General Refractories Company, Philadelphia, Pa.

Application July 31, 1947, Serial. No. 765,124 In Germany April 24, 1942 Section 1, Public Law 690, August 8, 1946 Patent expires April 24;, 1962 1 Claim. 1

rails by means of rollers, thus the heads can be moved away from the melting compartment. According to another proposition the heads of the furnace are adapted to be lifted off, of course necessitating the use of separate lifting devices.

vThese designs are subject to the disadvantage that the vertical gas and air fines of the fire boxes disposed under the heads are accessible for repair only after removing the whole heads.

The present invention overcomes these disadvantages by providing a head comprising individual parts which are arranged above the vertical gas and air fiues respectively, the said parts being removable and replaceable independently of each other. Therefore the head of the furnace consists of two separate parts at least. Preferably also that part of the flue is removable and replaceably arranged, which is disposed between the two removable parts existing above the gas and air flues respectively. The removably mounted part 4 of the flue which is adjacent to the tiltable melting hearth preferably also carries the neck of the gas flue in its end away from the melting hearth, whereas the mouth or the mouths of the air flue or air fines are provided in the bottom of the part at a distance from its front wall and adjacent said neck, and directed towards the kettle. This arrangement of the mouths is advantageous for the following reasons. In the usual designs there is an angle, the so-called guide bend, at the transmitting area from the hearth to the vault of the head, the latter usually being constructed more or less steep in order to ensure a perfect combustion, the masonry of that bend being subjected to an utmost amount of wear and tear, as generally known. That wear and tear is caused by the fact that the main quantity of the hot flue gases escaping from the hearth are sucked off along the vault of the head into the air chamber thus acting on the masonry of the bend by direct contact. For the reason of construction it was necessary to place the joint existing between the tiltable melting kettle or hearth and the stationary head into the cross-sectional plane of the bend, or near to it, that is in that part of the masonry which is subjected to the worst wear and tear. With the design according to the present invention the joint existing between the melting kettle and the head is enabled to be placed into the slightest worn cross-section of the furnace, and that due to arrangements of the mouths in the part adjacent to the kettle, thus the joint being subjected to a, considerably smaller amount of wear and tear. Besides the joint is disposed in a zone of pressure above the atmosphere, thus aspiring of cold fresh air through the joint is obviated in contrast to the hitherto known furnaces. 7

An embodiment of the invention is illustrated in the accompanying drawing, wherein:

Fig. 1 is a vertical section taken on the line II of Fig. 2, and

Fig. 2 is a horizontal section taken on the line IIII of Fig. 1.

Referring to the drawing, the tiltable melting kettle or hearth l is separated from the head 2 of the furnace by the continuous annular space which forms the joint 3. The head of the furnace consists of the three separate flue parts 4, 5 and 6, which are constructed and arranged to be removable independently from one another. The part 4 adjacent to the melting hearth I carries the neck of the gas flue 8 in its front wall spaced from the hearth and is provided with vertical openings in its bottom spaced from the joint 3, the openings being in connection (in registry) with the air flues I.

After removing the part 4 the vertical air flues i are accessible, and so is the vertical gas flue 8 after removing the part 6. The parts 4 and 6 are removable independently from each other and independently from the part 5.

subdividing of the head of the furnace results in a considerable reduction of weight of all the replaceable parts, thus the use of the highly expensive conveying and lifting devices can be avoided. Besides the joint is located at the cross-section of the furnace where the amount of wear is very small due to arranging the holes in the part 4 directly above and in registry with the hot air flues 1. Thus 4 is subjected to only a slight wear and tear, as it is not in direct contact with the escaping hot flue gases. Finally the joint is disposed in a zone of the furnace showing a pressure above that of the atmosphere, thus aspiring (sucking in) of cold fresh air through the joint is obviated.

What we claim is:

A regenerative metallurgical furnace comprising a tiltable hearth chamber and a relatively stationary generally rectangular removable and replaceable end chamber at each end of the hearth chamber, the end chamber having top, bottom and side walls which extend to the hearth chamber and provide a slit between the hearth chamber and the end chamber, having an end wall extending across the portion of the end chamber remote from the hearth chamber, there being a fuel gas port extending directly through the middle of the end wall into the end chamber, and two air up-and-downtakes extending from below directly into the end chamber adjoining the end wall and on either side of the fuel gas port, whereby the fuel gas and air mix in the removable end chamber during firing at a, particular end of the furnace.

FRANZ BARTU. HANS STEYRLEI'I'NER.

4 REFERENCES crmn The following references are of record in the file of this patent:

Number Number UNITED STATES PATENTS (Addition to No. 637,460)

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