US2123593A - Treatment of solid material with gaseous media - Google Patents

Description

July 12, 1938. M. VOGEL-JORGENSEN 2,123,593 TREATMENT OF SOLID MATERIAL WITH GASEOUS MEDIA Filed Feb; 6, 1937 2 Sheets-Sheet 1 MakfaeZ Kayak/0499mm?! INVENTOR ATTORNEYS July 12, 1938. M. VOGEL-JORGENSEN 2,123,593

TREATMENT OF SOLID MATEKJAAL WIT GASEOUS MEDIA Fiied Feb. 6, 1937 2 Sheets-Sheet 2 I INVENTOR Mz)%ae& @eh/Eyewem Mk ORNEYS Patented July 12, 1 938 UNITED STATES PATENT OFFICE was:

TREATMENT OF SOLID MATERIAL WITH GASEOUS MEDIA Mikael Vogel-Jorgensen, Frederihsberg, near penhagen lienmark, assignor to F. L. Smidth & 00., New York, N. Jersey 1 Y., a corporation of New Application February 8. 1937, Serial No. 124,512 In Great Britain I'Gbl'llll'! 8, 1936 1 Claims. (01. zss-ss) In Letters Patent of the United States No. 2,024,453 dated December 17, 1935 and granted to F. L. Smidth & Co. of New York, N. Y., the

present assignee, as theassignee of Mikael Vogel- Jorgensen, the present applicant, there is shown and described an apparatus comprising a drum like carrier upon the gas permeable periphery of which the material to be treated, such as finely I divided cement material, or other raw material 10 which may be treated with-gases, is deposited at one point in the rotation of the drum, is held thereon in part by the diiiferentiai of air pressures at the surface of the mass on the drum and on the other surface of the drum and is r discharged therefrom at another point in the rotation of the drum where the pressures are equalized, the mass of material being then discharged irom the drum by the action of gravity. In the continued use of such apparatus and in its adaptation to diverse uses in industry and particularly in the metallurgical and cement indus-- tries it has been found that while retaining the. general principle of operation disclosed in said Letters Patent some modifications in structure have been found desirable and-it has been the object of the present invention to provide an apparatus of the same general type which is more eflicient in operation. I v

The development oi the present invention has so been particularly concerned with the attempering or sintering of ores, but it will be obvious as this description proceeds that the invention is' capable of applicationto other specific uses also with improved results, as for example, the g burning of cement or drying of materials. In the particular embodiment of the invention shown and described herein the construction is such that a layer of sintered ore is applieddi- 00 small masses capable of being handled readily in the further treatment of the mass, the outer suri'ace of the mass when formed on the carrier being impressed with transverse indentations or grooves which make it easier for the mass to at break asit passes at an angle over a discharge roller or lip or bar. In accordance with the invention provisionis also made for preventing the falling of the mass from the carrier under the influence of gravity until the treatment of the mass has been completed and also for the 5 maintenance'of a negative pressure or partial vacuum within the carrier to hold the mass against the surface of the carrier and to break such partial vacuum in order to permit the discharge of the broken massfrom the carrie'r at the predetermined point of discharge.

The invention will be more fully explained hereinafter with reference to the accompanying drawings in which it is illustrated, and in which:

Figure 1 is a partly diagrammatic view in sectional elevation of a simplified form of the apparatus, from which are omitted details of construction which will be referred to.

Figures 2, 3 and 4 are detail vie s of diiierent types of auxiliary supporting devices.

Figure-5 is a view in longitudinal section of a form'of apparatus whichembodies the inven-- tion, includingsuch appurtenances as are to be described.

Figure 6 is a view of the apparatus in partly as ,sectional elevation as seen from the right hand in Figure 5, the lower right hand quadrant being shown in elevation, the upperright hand quadrant being shown in section on the broken line 6-4 of Figure 5, and theremainder of the apparatus being shown in outline.-

Flgure 7 is a view in end elevation as seen from the left hand on the line l-.-'| of Figure 5.

Figure 8 is a detail view, in sectional elevation 5 and on a larger scale than Figure 5, of one of the valve actuating mechanisms.

The embodiment of the invention illustrated in the drawings is intended primarily for attemper ing or sintering ore. It comprises a grated roo tary :drum i having end' plates iand ii, mounted on a tubular shaft. l= and supporting grate bars- I (aflording perforations to permit the passage of air or other gaseous medium) which are parallel with the axis of the drumQ-is The tubular shaft is shown asflclosed at one end, as at i', and as receiving tires l resting on supporting rollers I, and a pulley I through which thedrum mayjbe rotated. At its other vend the tubular shaft F is connected to an exhaust fan i', the tubular shaftbeing' provided 'withopenings, as at I, through which the exhaust fan is connected with the interior of the drum. Radial partitions 8 divide the interior 'ci' drum into chambers I and each chamber is 55.

connectedthrbughaport iwithachamberl'.

which communicates with the 7 the tubular shaft the exhaust fan I interior of the shaft I through the openings I The interior of each chamber of the drum may thus be placed in communication with the squared to be held from rotation, isarmed with .aflange landaroller l which coactsln the rotation of the drum with a cam rail I, whereby at the propertime in the rotation of the drum the valve 8- is forced from its seat and the interior or the chamber is placed in communication with l and the exhaust fan I.

A stepped bell crank lever I, pivoted at h, coacts with the flange 8' to. hold the valve I from its seat after the roller 8 has left the cam rail until the upper arm of the'bell crank detent i coacts with a cam rail 8*, thereby disengaging the detent from the flange I and per- :nitting the valve I to be closed by thespring In the osite end wallof each chamber 1 is a portll forthewdmissionofairtotheohamber '.for the purpose of breaking at the proper time the partial vacuum which has been created in the chamber by the action of the exhaust fan I. This port II is controlled in the same manner as already described with respect to the port 8 by a valve ll, held normally closed bya spring ll andopened undercontrol of a detent ll by thecoaction of a roller Iland a cam rail 8i and closed again when detent II is disengaged from flange ll by coaction with a cam rail Il Each valve controlling mechanism, for the admission ofair to each chamber 1, may be' in all respects precisely similar to the valve controlling mechanism for the port 8 and therefore need not be described moreindetailherein. V

Pro-sintered material is supplied ou h a chute 2 to thegas permeable surface of the grated carrier drum and forms on the peripheral surfaceof the carrier drum a layer which protects the drum from the destructive action 'of the heat developed in the attempering or 'sinfering of-the material which is delivered through a chute I and is superimposed as a layer on the protective layer above referred to; Line 24 of Figure 1 indicates the line of demarcation between the protecting layer of sintered ore and that to be sintered. This line has been indicated as extending som what more than half way around the drum and at the point indicated by'its end the process of attempering or sintering is presumed tohave been completed and the two layers of material amalimposed on the protective layer of pre-sinfered gamated as a homogeneous cake 0! thoroughly sintered material.

The raw material itself containing a combustible element or being mixed with fuel and supermaterial is subjected to the action of flame from a burner l, the combustible element being thereby ignited and burning with suillcient intensity to eifect a complete sintering of the raw material and an amalgamation of the same with the presintered material of the inner layer. The progress of the sintering of the material is indicated by the broken line ll of Figure 1.1

Porthepurposeoi'compressingsomewhatthe layer of raw material mixed with fuel there is provided a roller l which is carried by springpressed arms I and thereby pressed'flrmly tubular shaft I and againstthematerialonthedrumtocompact the same. The roller 4 is provided at its ends 'with flanges 4 which separate the material on the drum, at least at its surface, from the end walls I and I of the drum. The roller l'is also" provided with blades 4 which, as the roller ro-' tates through frictional contact with thematerial I are by its own weight as well as by the suction which is applied to the interior of the drum through-the opening of the ports 8. when the material has passed in the clockwise rotation of the drum beyond the upper arc the influence of ravity in holding the material on the drum is diminished and lost and it might be that in the drying out and heating of the material the material might fall away from the drum during its movement through the lower arc of rotation. Accordingly there is provided an auxiliary or supplemental support for nullifying the efiect of gravity on the material during the lower arc of movement of the drum and preventing such undesirable action. As shown in Figures 1, 2. and 3 such supplemental support consists of an endless gas permeable belt ll carried on rollers l2,

as shown in Figure 2, or by rollers 20, connected by chains 2|, as shown in Figure 3. This'auxiliary support might also be formed of v rollers I! linked together by chains 13, so that each roller may rotate on its own axis while held in contact with the material on the drum.

As the cake of sintered material passes from the drum over the-belt supporting roller l2 and is made thereby to change direction it will break --on the drum, are pressed into the material on into small pieces facilitated by the indentations.

In the operation of the apparatus the perforated surface of each chamber I of the drum, as thedrum rotates in a clockwise direction, receives from the chute 2 a relatively thin protective layer of the pre-sintered material and,immediately thereafter receives superimposed on the protective layer, from the chute 3, the layer of raw material containing a combustible element or admixed with a fuel, both layers being compressed by the roller 4 and marked by the flanges and blades of that roller. In the continued movement of the drum each chamber 1, as it passesbeyond the vertical plane, is subjected to suction through the described connection to the exhaust fan, the valve I of the chamber being opened by the describedmechanism and held open until the chamber has-passed through the lowermost position, whereby the cake of material is held to the surface of the chamber by suction or partial vacuum within the-chamber against the action of gravity, accidental separation of the cake from the surface of the chamber being further guarded against by the auxiliary support ll. As each chamber passes toward the point of discharge beyond the vertical axis of the drum in the lower arc of its movement the valve 8' is closed by its spring (the detent '8 having been disengaged by 2. An apparatus as described in claim 1, and in coaction with cam rail 8*) and at that time the valve 8! is opened by the described mechanism and air is admitted to the chamber to destroy the partial vacuum within the chamber; The cakebeing thus released separates from the surface 0! the drum and breaks as it moves through the angle over the roller II. This described action takes place for each chamber of the drum carrier and the cake of attempered or sintered homogenized material passes continuously from the discharge point to be received in a receptacle preparatory to further treatment in another apparatus if desired. 7

While the invention has been described herein with particular reference to the use of apparatus in sintering ores, it will be understood that the invention is not restricted to use' for attempering or sintering ores and that the apparatus illustrated may beused for burning cement material, or for drying cement materials, or other materials, or for any other process'in which solid materials are treated with gases. It will be understood. that various changes may be made in details of construction and arrangement to suit 26 diflerent conditions of use and that, except as pointed out in the accompanying claims, the invention is not restricted to the particular construction shown and described. I claim as my invention: i 1. An apparatus for the attempering of solid material comprising a rotary drum provided with a plurality of radial chambers, each chamher having a gas permeable peripheral surface.

and closed at its end except for an air suction 35 port, means to supply material to be treated to the peripheral surface of each chamber as the drum rotates, means to subject each chamber to suction as it approaches the vertical axis of the drum in the upper arc of its movement and passes through the upper arc of movement, means to terminate the suction as the chamber passes be-' yond the vertical axis of the drum in the lower arco! movement and approaches the point of dis-, charge of the material, each chamber being provided at one end with an air suction port and at the other end with an air inlet port, and means toadmit airthroughtheinletport asthecham- .ber approaches the point oi. discharge or the mata'ial.

which each chamber is provided at one end with an air suction port-and at the other end with an air inlet port, a valve to control the air suction port, a valve to control the air inlet port, an

means-to actuate the valves. 7

3. An apparatus as described in claim 1, and

in which each chamber is provided at one end i with an air suction port and at the other end with an air inlet port, a valve to control the air suction port, a valve to control the air inlet port, springs enacting with the valve to close the ports, and means acting on both valves to move .them t open the ports.

4. An apparatus as described in claim 1, and

with an air suction port and at the other end with an air inlet port, a valveto control the air suction port, a valve to control the air inlet port, springs coacting with the valves to close the ports, means acting on both valves to move them to open the ports, a detent for each valve to hold the valve from its seat, and means to release both detents.

5. An apparatus as described in claim 1, and in which there is provided an auxiliary gas permeable support to hold the material against the drum and to nullify the effect of gravity on the material during the lower arc of movement of the drum.

6. An apparatus as described'in claim 1, and in which there is providedan auxiliary gas permeable support to hold the material againstthe drum and nullify the chest of gravity on the material during the lower arc of movement of the drum. the auxiliary support consisting of an endless gas permeable chain belt, comprising bars flexibly connected by wires or chains.

7. An apparatus as described in claim 1, and

in which there is provided an auxiliary gas permeable support to hold the material against the drum and nullify the effect of gravity on the material during the lower arc of movement of the drum, the auxiliary support consisting of interlinked rollers, said rollers rotating on their own axes while held in contact with material on the drum.

' VOGEL-JORGENSEN.

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