DE2137723A1 - INCLINED OVEN - Google Patents

Description

PATENT ADVOCATE! * '* DR. ING. KARL BOIMMCRT DIPL.-ING. ALBERT BOEHMERT

28 BREMEN FELDSTRASSE 24 TEL. (0421) * 444038

DR.-ING. WALTER HOORMANN - Pl PL PHYS, PR, HEINZ GOPP AR

New TeL no. (042T) "74044") Po "heh" cfckontoi Hamburg 126083 Bank account ι Br.mer Bank, Br.mtn, Account 1001449

Karl Beckenbach

B 109 28 Bremen, July 28, 1971

Dipl.-Ing. Karl Beckenbach, Büderich b / Düsseldorf, Meererbusch, Hildegundisallee 33

Inclined furnace

The invention concerns an inclined furnace for firing and sintering, in particular of limestone or the like, with one or more superimposed Combustion chambers with laterally limited drainage area in the combustion chamber wall opposite the drainage area arranged burners, and arranged at the top and bottom of the drainage surface material supply and drainage shafts.

In the case of inclined ovens, the angle of inclination of the drainage surface relative to the horizontal must be greater than the The slope angle of the material slipping on this surface, thus also the through the slipping layer of dust trickling through can slide off along this surface, this means that the layer thickness of the slipping on the drainage surface Material increases downwards, so that the depth of penetration of the gas © and the warm brah-

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downwards into the stratum - relatively speaking - decreases.

The uneven layer caused by the excessively thick layer in the lower combustion chamber and insufficient heating of the goods in this area is caused by the transition of the goods The rearrangement of the material taking place at the lower combustion chamber is not compensated to the required extent. A sufficient reduction in the layer thickness in the lower combustion chamber area can also be achieved a reduction in the width of the feed duct, which is used as a preheating duct in the upper combustion chamber serves, does not achieve. With the very considerable reduction required for this of the shaft cross-section would be in the upper area the drainage area of the upper combustion chamber and in particular near the outlet end of the preheating shaft there is a risk of clogging because there is an increase in the temperature caused in the preheating zone Heating of the material, especially in the case of "limestone or dolomite, a thermal expansion of the material occurs. Only when the expulsion of carbonic acid begins, diminished the volume of each piece, Wean the Narrowing is still part of the preheating zone; there is a risk of clogging and it is only then eliminated when the carbonic acid expulsion begins.

Another disadvantage of a large layer thickness

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on the contact surface is that the free volume of the combustion chamber is reduced. A sufficient size of the free space above the material layer in the combustion chamber or what is present between the material surface and the run-off surface Distance is for the complete burnout of the abandoned Fuels and very important for careful handling of the items to be fired.

To by reducing the layer thickness in the lower area of the combustion chamber with simultaneous Improvement of the combustion conditions a more even heating of the material in the To achieve combustion chamber, according to the invention in the combustion chamber in the region of the lower end the inner wall of the feed chute a spaced from the drainage area, tenwanden extending between the combustion chamber Partition wall provided ,,

The presence of the partition walls also makes the running speed more uniform of the goods reached transversely to the drainage surface. While namely with ovens without partition walls the run-off speed in the two lateral areas of the run-off surface by the between the property and the two side walls of the chamber Occurring friction compared to the central area of this surface is significantly delayed, is that all areas

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the drainage area on both sides through walls are flanked, the same process speed is ensured in all areas. To compensate the previously existing speed differences required measures, such as a special one Control of the burners assigned to the individual areas can be omitted.

In the case of combustion chambers of greater width, it is advisable to place the partition between them with the Combustion chamber side walls connected ends by one or more perpendicular from that of the drainage surface support upwardly extending support walls.

In the case of inclined furnaces with an intermediate wall resting on supporting walls, each is preferably between two support walls or between a support wall and a combustion chamber ei tenwand lying furnace section an individually controllable burner assigned.

r An embodiment of the inventively designed Inclined furnace is described in the following part of the description with reference to the drawing. In the drawing is:

1 shows a central longitudinal section through the upper combustion chamber of an inclined furnace;

FIG. 2 is a section 2-2 of FIG. 1 seen in the direction of the arrow; FIG.

3 shows a section 3-3 of FIG. 1 in the direction of the arrow seen;

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Pig. 4 one of the pig. 1 corresponding view a modified version? shape of an inclined furnace; and

Pig. 5 a section 5-5 of the Pig.Λ in the direction of the arrow seen.

In the figures, only the upper combustion chamber 10 of a double inclined furnace is shown, which consists of two one above the other arranged combustion chambers with oppositely inclined drainage surfaces. The next the part of the upper combustion chamber 10 that is located in the feed duct serving as the preheating duct 12 is covered by the combustion chamber ceiling 14, which is usually curved upwards in inclined furnaces is. The inclined drainage surface 16 adjoins the outer wall of the preheating shaft, which is opposite the vertical combustion chamber wall 20 provided with the burners 18. On his The combustion chamber is closed on both sides by vertical side walls 22. The one on the drainage surface Slipping material into the lower combustion chamber (not shown) leading into the transition shaft is denoted by 24.

The angle of inclination of the drainage surface 16 is greater than the angle of slope through the feed shaft entering the combustion chamber, so that the material is in a usually auegebilden Combustion chamber on the drainage surface is sloped so that the distance between the from the preheating shaft to the vertical burning =

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room wall extending line a and the drainage area is present, is constantly increasing.

This distance is therefore in the lower area of the combustion chamber in inclined furnaces of the previously common design or the layer thickness of the material so great that the combustion gases emerging from the burners the layer can only partially penetrate and this also applies to those from the free area heat radiating from the combustion chamber. In addition, the effect caused by the great layer thickness is effective Reduction of the free space available in the combustion chamber for the gas throughput Space adversely affects the perfect combustion of liquid or gaseous fuel the end.

To reduce the layer thickness within the combustion chamber, a small distance from the Combustion chamber ceiling and from the upper section of the drainage surface 16 a relatively narrow partition 26 are provided, which are located in the area of the interior or in the combustion chamber ceiling passing inner wall of the preheating shaft 12 across the combustion chamber between the side walls 22 extends. In the embodiment shown, the partition between their in the ends anchored to the side walls are supported by relatively narrow support walls 28.

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As can be seen from FIGS. 1 to 3, the partition is arched and roughly follows the contour the combustion chamber ceiling 14-. Also between the two support walls ″ or between these and the combustion chamber side walls 22 lying sections of the partition wall are curved in themselves. The partition is preferably at an acute angle to the vertical in the direction of the drainage surface 16 inclined.

The line b drawn in FIG. 1 shows that the material is in the presence of the partition below this wall along an embankment line © that is much lower than the line a drops off, resulting in both a considerable reduction in the layer thickness and a corresponding increase of the free combustion chamber volume is achieved «

The support walls 28 preferably extend from near the lower end of the drainage surface 16 Stand vertically up to the partition wall, then horizontally to the inner edge of the lower end of the preheating and then at an angle down to the drainage area

In the embodiment according to Figures 1 to 3 » at the between the upper edge of the partition wall 26 and the combustion chamber ceiling 14 a relatively there is a narrow gas passage gap extending over the entire width of the furnace, the Support walls 28 also up to the combustion chamber ceiling.

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be pulled and then help to support the ceiling.

An additional support of the ceiling is also achieved in the embodiment shown in Figures M and 5, in which the support walls or the partition wall supported by them are carried out to directly under the preheating shaft, so that the vault that the side facing the burners of the preheating shaft can be replaced by three correspondingly smaller and therefore safer and more durable individual vaults. In this case, no gas passage gap at all needs to be present between the partition wall and the end vault of the preheating shaft. Rather, the entire flow of the fuel gases goes down around the partition wall. An advantage of this arrangement is that the combustion chamber can have a significantly greater width by using three vaults instead of one, while maintaining the large free area of the combustion chamber, which is important for combustion.

The burners 18 are arranged so that they are opposite the BreimraiMabschnitte which are laterally limited by the "two supporting walls or by a supporting wall and a side wall 2M " So in the embodiment shown, three burners are provided, which are preferably individually adjustable so the individual sections according to the different

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heated sliding speeds
can.

It can be shown as part of the The inventive idea can be modified in many ways, so instead of the one shown a partition supported by retaining walls, a continuous partition can also be used, which can be, for example, a cooled carrier with a box profile.

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Claims (7)

Expectations 1. Inclined furnace for burning and sintering, especially limestone or the like with a or several stacked combustion chambers with laterally limited inclined drainage areas, burners arranged in the combustion chamber wall opposite the drainage surface, and material feed and drainage shafts arranged at the upper and lower end of the drainage area, characterized by one in the combustion chamber in the area of the lower end of the interior Wall of the feed shaft at a distance from the drainage surface (16) arranged between the intermediate wall (26) extending from the combustion chamber side walls (22). 2. Inclined furnace according to claim 1, characterized in that that the intermediate wall (26) between its ends connected to the combustion chamber side walls by one or more support walls extending vertically upwards from the drainage surface (28) is supported. 3. Inclined furnace according to claim 2, characterized in that the supporting walls are attached to their the with the burners on the opposite sides of the combustion chamber wall from near the bottom 309810/0254 Ren end of the drainage area lying points from essentially perpendicular to the partition (26) and on their faces facing the drainage area Extend sides obliquely downwards. 4-. Inclined furnace according to one of Claims 1 to 3, characterized in that the upper edge of the The intermediate wall (26) is arranged at a smaller distance from the combustion chamber ceiling (14) » 5 ", inclined furnace according to one of claims 1 to 3", characterized in that the partition (26) © ine lower extension of the inner wall of the wämschachts (12) forms «, 6 _β inclined furnace according to © inem der VOrto.g © tead © spg € ehe, thereby gakesaseielmet «that the © seiisnwand (26) emtgpreeliead of the vault & ®τ B2? © kd. Raumdeeke (14) is bent like a curve 7. Sctoägofen na © fe © 1el © s d © ^ sprüeh ©, thereby g © k © aass © i © fea @ t ₉ that di @ see wall (26) uates © ife © a spitsea Ifiak © vertical in lisfetnag aiaf the flow flee © (16) is inclined _o 8 »Sehrägofen n & © h © ia @ m ύ.®τ lÄspriielie 2" until gekennzeiefea, © t ₉ that j © d © a swise1a @ a supporting walls (28) © cl @ i? Gwise ^ en a Stiitiwaafi uad © iner Combustion chamber © i ^ @ aw-and (22) li © g @ adoa cut "a single controllable Brenaei ¹ (18) is arranged", 30S810 / 0254 Blank page