DK151156B

DK151156B - ROOT OVEN WITH PLANETARY COOLER BEETS

Info

Publication number: DK151156B
Application number: DK142875A
Authority: DK
Inventors: Gerard Ghestem
Original assignee: Fives Cail Babcock
Priority date: 1973-01-03
Filing date: 1975-04-03
Publication date: 1987-11-09
Also published as: DK151156C; DK142875A

Description

151156151156

Opfindelsen angår en roterovn med planetariske kølerrør, hvor hvert kølerrør ved sin tilgangsende for materiale er forbundet med ovnen gennem en fødetragt, og hvor tilgangsenden af hvert kølerrør dannes af en keglestub, som langs periferien af sin 5 største grundflade er forbundet med kølerrørets cylindriske væg.The invention relates to a rotary kiln with planetary radiator tubes, where each radiator tube at its access end for material is connected to the furnace through a feed hopper, and the access end of each radiator tube is formed by a cone stub connected to the cylindrical wall of the radiator tube along the periphery of its largest surface.

Materialet, der skal afkøles, falder gennem fødetragten ned i kølerrøret, når det befinder sig under ovnen, og køleluft, som 10 indsuges gennem kølerrøret, strømmer ind i ovnen, hvor den anvendes som sekundærluft.The material to be cooled falls through the hopper into the cooling tube as it is under the furnace, and cooling air which is sucked in through the cooling tube flows into the furnace where it is used as secondary air.

For at undgå, at materialet, som skal afkøles, falder tilbage i ovnen, når kølerrørene befinder sig i den øverste del af dens bane, giver man sædvanligvis den del af væggen, som mate-15 rialet falder ned på, en sådan hældning, at materialet fjernes fra fødetragten og skubbes hen mod kølerrørets afgangsende.In order to prevent the material to be cooled from falling back into the furnace when the cooling tubes are in the upper part of its path, the part of the wall on which the material falls down is usually inclined so that the material is removed from the hopper and pushed towards the outlet end of the radiator.

Den ende af kølerrøret, som fødetragten er forbundet til, kan være dannet af en keglestub, som er koaksial med kølerrørets kropparti. Denne løsning er imidlertid ikke helt tilfredsstil- 20 lende, idet der på kølerrørenes keglestubformede del bliver liggende en bunke materiale, som vil falde tilbage i ovnen, når kølerrøret atter bevæger sig opad. For at afhjælpe denne ulempe har man foreslået at anbringe en skrueformet afbøjningsplade i kølerrøret, hvilken afbøjningsplade under ovnens 25 rotation skubber materialet hen mod afgangsåbningen (DE-offent-1iggørelsesskrift nr. 22 25 097). Denne afbøjningsplade må selvfølgelig være beskyttet af en ildfast beklædning, hvilket komplicerer konstruktionen af kølerrørene væsentligt.The end of the cooling tube to which the feed hopper is connected may be formed by a cone stub coaxial with the body portion of the cooling tube. However, this solution is not entirely satisfactory as there is a pile of material lying on the cone-shaped frusto-shaped part of the radiator tubes which will fall back into the furnace as the radiator tube moves upward again. To remedy this disadvantage, it has been proposed to place a helical deflection plate in the cooling tube, which deflection plate during rotation of the furnace 25 pushes the material towards the outlet opening (DE Publication No. 22 25 097). This deflection plate must, of course, be protected by a refractory lining, which considerably complicates the construction of the cooling pipes.

30 Med den foreliggende opfindelsen er det tilstræbt at tilvejebringe et kølerrør, hvis udformning, selv om den er meget simpel, gør det muligt at forhindre tilbagefald af materialet fra kølerrørene og ned i ovnen.It is an object of the present invention to provide a cooling tube whose design, although very simple, makes it possible to prevent relapse of the material from the cooling tubes into the furnace.

35 Ifølge opfindelsen er keglestubben langs periferien af sin mindste grundflade forbundet med fødetragtens væg, og planerne gennem keglestubbens to grundflader er således skråtstillede i forhold til kølerrørets akse, at materiale, som fra ovnen fal- 2 151156 der ned i kølerrøret, vil fjerne sig fra tilgangsåbningen fra fødetragten, når kølerrøret beskriver den opadgående del af sin bane.In accordance with the invention, the cone stub along the periphery of its smallest base surface is connected to the wall of the hopper, and the planes through the two base surfaces of the cone stub are so inclined with respect to the axis of the cooling tube that material falling from the furnace into the cooling tube will remove from the the inlet opening from the feed hopper when the radiator describes the upward portion of its path.

g Den følgende beskrivelse refererer til tegningen, som viser en udførelsesform for et kølerrør til ovnen ifølge opfindelsen, idet figuren viser et snit ved tilgangsenden af kølerrøret med tilhørende fødetragt og en del af ovnen og lagt gennem det plan, som indeholder ovnens og kølerrørets akser.g The following description refers to the drawing showing an embodiment of a cooling pipe for the furnace according to the invention, the figure showing a section at the inlet end of the cooling pipe with associated feed hopper and part of the furnace and laid through the plane containing the axes of the furnace and the cooling pipe.

1010

Det på tegningen delvis viste kølerrør 10 bæres af en rørformet roterovn 12, hvis akse i hovedsagen er parallel med kølerrørets akse. Flere tilsvarende udformede kølerrør er anbragt rundt om ovnen ved dennes afgangsende, og de drejer sammen med ovnen.The cooling pipe 10 shown in the drawing is partly supported by a tubular rotary kiln 12, the axis of which is substantially parallel to the axis of the cooling pipe. Several similarly designed cooling tubes are arranged around the furnace at its outlet end and rotate with the furnace.

1515

Hvert kølerrør er fastgjort til ovnen ved hjælp af to bæreringe. Den ene bærering 14, som er anbragt nær ved kølerrørets tilgangsende, er stift forbundet med ovnens cylindriske væg.Each cooling tube is attached to the furnace by two bearing rings. The one bearing ring 14, which is located near the inlet end of the radiator tube, is rigidly connected to the cylindrical wall of the furnace.

Den anden ring, som ikke er vist på tegningen, er forbundet 20 med ovnens cylindriske væg ved hjælp af et system af ledstænger eller andre passende lejringsorganer, som tillader kølerrøret at udvide sig frit i længderetningen.The second ring, not shown in the drawing, is connected to the cylindrical wall of the furnace by means of a system of handrails or other suitable bearing means which allow the cooling tube to extend freely longitudinally.

Kølerrøret indbefatter et cylindrisk parti, som indvendigt er 2g beklædt med et ildfast materiale i det mindste ved tilgangsenden for materialet, som skal behandles. Denne ende af kølerrøret er udformet som en skråt afskåret keglestub 18, som ved sin største grundflade er forbundet med rørets cylindriske parti og ved sin mindste grundflade er forbundet med en føde-30 tragt 20, som forbinder kølerrøret med ovnen.The cooling tube includes a cylindrical portion which is 2g internally coated with a refractory material at least at the access end of the material to be treated. This end of the cooling pipe is formed as an oblique cut-off cone 18, which at its largest base surface is connected to the cylindrical portion of the pipe and at its smallest ground surface is connected to a feed hopper 20 which connects the cooling pipe to the furnace.

Keglestubben 18's akse 22 er skråtstillet i forhold til kølerrørets akse 24, og dens grundflader er beliggende i to planer, som er skråtstillede i forhold til aksen 24, som vist på tegningen, hvorved materialet, som falder ned i kølerrøret, når 35 dette befinder sig i den nederste del af sin bane, fjerner sig fra tilgangsenden af kølerrøret, når dette bevæges opad.The axis 22 of the cone 18 is inclined with respect to the axis 24 of the radiator, and its bases are disposed in two planes which are inclined with respect to axis 24, as shown in the drawing, whereby the material falling into the radiator when it is 35 in the lower part of its trajectory, removes it from the access end of the radiator as it moves upward.

På tegningen betegner henvisningstallet 26 den bunke materiale, som findes i kølerrøret, når dette befinder sig underIn the drawing, reference numeral 26 denotes the pile of material contained in the cooling pipe when it is under

Claims

151156 in the position shown in the drawing. The dotted line line 26 'represents the position of the pile after half a turn of the furnace, the cooling pipe now being above the furnace. It will be seen that the pile of material has removed itself sufficiently from the inlet opening from the feed hopper so that it can no longer fall back into the furnace. The feed hopper consists of two parts, namely a part which is fixedly connected to the cooling pipe, and a removable part which is fixed to the oven by means of a flange, and the tightness between the two parts is secured by a sleeve 28 with bellows. Claims.

Rotary kiln with planetary radiator tubes, where each radiator tube at its access end for material is connected to the furnace through a feeder funnel and the access end is formed by a cone stub, which along the periphery of its largest base surface is connected to the cylindrical wall of the radiator tube, the cone stub 20 along the periphery of its smallest base surface is connected to the wall of the feed hopper, and the planes through the two ground surfaces of the cone stub are so inclined with respect to the axis of the cooling tube that material falling from the furnace into the cooling tube will remove from the inlet end at the feed hopper 25 when the cooling tube describes the upward part of its trajectory.