AU593635B2

AU593635B2 - Filler device for a tubular drier

Info

Publication number: AU593635B2
Application number: AU71918/87A
Authority: AU
Inventors: Sonnhart Gauch; Maternus Rosellen; Hans-Joachim Seidel
Original assignee: Fried Krupp AG
Current assignee: Fried Krupp AG
Priority date: 1986-05-16
Filing date: 1987-04-23
Publication date: 1990-02-15
Anticipated expiration: 2007-04-23
Also published as: DE3616564C2; AU7191887A; JPS62272086A; DE3616564A1; DD256556A5; JPH06100420B2

Description

COMMONWgEALTH OF AUSTRALIA 3 0 3 Patent Act 1952 CO0M P L E TE S P EC IF IC A TION

(ORIGINAL)

Class Int. Class Application Number7/ Lodged Complete Specification Lodged Accepted Publishe( This doetimcft *MWW an*1 A Priority: A&lated Art 16 May 1981 &ame of Applicant -'Adress of Applicant FRIED. KRUPP GESELLSCHAFT MIT

BESCHRANKTERHAFTUNG

Altendorfer Strasse 103, D-4300 EsS 1, Federal Republic of Germany Sonnhart Gauch, Maternus Rose] len, Hans-Joac~tim Seidel Actual Inventor Address for Service F.B. RICE CO., Patent Attorneys, 28A Montague Street, BALMAIN. 2041.

Complete Specification for the invention entitled: FILLER DEVICE FOR A.-TUBULAR DRIER The following statement is a including the best method of full description of performing it known this invention to us:-

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r iii~ i: 4 :i 1~ Declarant's Name ip I-Png. W. Dehmer Mr. Ludger Frielina F B. RICE CO PATENT ATTORNEYS C. This form is suitable for any type of Patent Appi Iation. No legalisation required.

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*4 54* t a The invention concerns a filler device for a tubular drier rotating around a stationary shaft, intended particularly for brown coal, with a chute pivotable in front of the inlet end wall between two lateral guide walls, with a control gate which is retained in a height adjustable manner above the chute and with a floor wall, which screens off the region between the guide walls and the inlet end wall in a downward direction underneath the chute, whereby the distance between the chute and the control gate (seen over the width of these components) can be adjusted.

Filler devices of the type stated above, to which the material to be dried (particularly brown coal) is being conveyed for example from a closeable filler funnel are to ensure, that the material to be dried enters the area of the inlet end wall of the tubular drier with the smallest possible sliding speed and subsequently enters into the heated drying tubes emanating from it.

10 a 4 4 4 4 Besides the variability of the inclination angle of the chute, the sliding behaviour of the material to be dried can also be influenced by the height adjustment of the associated control gate: bringing it closer to the chute will result in a reduction of the flow cross sectional area, through 2 0 which the material to be dried travels towards the inlet end wall.

A further possibility of influencing the sliding behaviour is given by the fact, that the distance between the chute and the control gate (seen over the width of these components) is made adjustable. Particularly, the two nominated components can be mutually set with respect to each other in such a manner, that their mutual spacing in the direction of the tubular drier shaft diminishes. Notwithstanding the adjustability of the chute and of the control shutter operating in conjunction with it, it is not possible to avoid difficulties while feeding of the material to be dried particularly in that case if it has a tendency towards caking. Because of the generated plugs, entry into the drier tubes of the material being dried can be severly impeded under certain circumstances and the drying capacity reduced.

i-I l 4 .1 -2 40 0 0 00 0 04400 0 40* o 9* 00 0 9 0 9~*40 04 0 000 0000 0 09 90 1 9 00 9 b) *9 9 0000*9 0 000009 4 00 00 0 000 000*04 0 5 Similarly, the proposal to loosen up the material to be dried by means of a so-called fluidised bed, that is through the injection of c6mpressed air from the direction of the floor partition towards the end section of the chute which points towards the drier, has not resulted in a number of cases in the-desired sliding behaviour of the material to be dried.

The invention is based on the task to further develop a filling device of the initially mentioned type in such a 10 manner, that the motion of the material to be dried is facilitated in the vicinity of the tubular drier and assisted. Consequently, the filling device should therefore be constructed in such a manner, that it contributes to a loosening up of the material to be dried, 15 at least in the vicinity of the inlet end wall of the tubular drier.

The present invention comprises a filler device for a tubular drier rotating around a stationary shaft, with a chute pivotable, in front of a tubular drier inlet end 20 wall, between two lateral guide walls, with a control gate which is retained in a height adjustable manner above the chute and with a floor wall which screens off the region between the guide walls and the inlet end wall in a downward direction underneath the chute, whereby the 25 distance between the chute and the control gate, seen over the width of these components, can be adjusted, characterized in that the chute incorporates a blower unit wrhich protrudes beyond an end section of the chute and" .,faces the drier with blower openings of the blower unit pointing towards and adjustably spaced from the inlet end wall.

The basic concept of the invention consists therefore, to install on the chute in the transfer region, that incorporates in the area of its end section facing the drier, a blower unit which also extend s the chute.

t I I 0 ,vow"~ -3i Its blower openings which point towards the inlet end wall Sof the tubular drier can be adjusted with respect to their position relative to the inlet end wall. There, the arrangement and construction of the blower openings shall be such, that they will drive the material to be dried into the drier tubes and will cause at the same time a loosening up of the layer of material to be dried, which forms in the area between the terminal section facing the drier and the inlet ond wall.

10 In a further development of the subject of the *invention, the blower openings of the blower unit are *located underneath (of the roof-like straight line extension) the chute.

The desired acceleration in the direction towards the 15 tubular drier of the material to be dried can be achieved by the means of constructing the blower openings as slots (in a form similar to a venetian blind) and that they are mutually displaced in the direction toward the inlet end S:i w" all in the manner of a venetian blind. For preference, S t 20 construction of the blower unit is such, that the angular position of the blower openings can be adjusted with respect to the inlet end wall. Consequently and if need S'be, the blower openings can be brought into an angular position, which will result to an increased extent for the 25 flew of gas to be directed in an upwards direction.

The configuration of the blower unit may be of such a i type that an extension line through the blower unit which ;^includes the blower openings, forms an acute angle with the inlet end wall and/or in which the blower openings ,(seen from the side) are aligned approximately S perpendicular to the inlet end wall. l For the purpose r(-ensuring a uniform pressurised gas l Supply over the width of the chute, the blower openings, when viewed over the width of the chute, are partitioned :35ito mutually independent sectors, and/or the amount of 3a E~ 8~ 00 0 0~, 0 04*48 00 80 0 0 08*048 8 08 0 0 0~0 0#08 0 00 0 00 0* 0 00 0 084000 0

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8 00 00 C 0 7s 8 000 00080* 8 air flowing through each blower opening is independently controllable. The separation into groups is necessary for the purpose of matching the effect of the blower un~ t to the drier tubes which rotate at various circumferential velocities. So for example the gas quantity flowing through per unit of time (corresponding to the number of drier tubes passing through per unit of time) must be increased with increasing distance from the rotation shaft of the tubular drier. The quantity of air that needs to 10 be fed into the region of the drier tubes located at the periphery can thus be several times the amount of air, which needs to be put through in the region of the drier tubes located near the centre, in the vicinity of the rotation shaft.

15 The subject of the invention can be further refined in that the blower unit contains a hollow beam incorporating the blower openings, the width of which corresponds approximately to that of the chute and is movably attached to the latter by means of guide elements 20 in a sliding manner in the longitudinal direction of the chute. Through displacement of the hollow beam on the chute, the position of the blower openings with respect to the inlet end wall of the tubular drier facing it can be adjusted within very fine limits to match the operating 25 conditions, particularly the properties of the materia~l to be dried.

The effect of the blower openings onto the material to be dried can be possibly changed additionally by the means that the hollow beam is attached to the chute in a hinged manner. This is understood to cover particularly such an arrangement, in which the hollow beam hin'es around a hinge axis running parallfel with the transverse direction of the chute 'and can be locked in various positions of deflection.

7 5 A preferred implementation of the subject of the J1 0 ;W.4

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3b invention is characterised in that the hollow space of the hollow beam incorporates several, mutually separated, sectors located side by side, which may be connected by means of individual feeder lines, each equipped with its throttling valve, to a pressure medium source. By means of suitably adjusting the throttling valve, air quantities of various magnitudes can be made to act upon the material to be dried through the various sectors of the hollow beam. If need be, the effect of the filling device can be improved further by the means that measured quantities of pressurised gas may be injected through the floor wall which incorporates, at least in the area underneath the end section of the chute pointing towards the drier, drilled holes pointing upwards into the area located above. In such an implementation form of the subject of the invention, the effect of the blower unit is th erefore assisted by means of the fluidised bed mentioned previously.

r l~ "rli; l -4- -connected by means of indiv idal. feeder lines, each e. .pd with its throttling valve, to a pressure medium source (Claim 12). means of suitably adjusting the throttling valve, air quatities of various gnitudes can be made to act upon the material to be dried through th various sectors of the hollow beam.

If need be, the effect of the filling vice can be improved further by the means that measured-out qua ities of compressed air may be injected through the floor plate whic incorporates upwards pointing drilled floor holes at least in the are underneath the end section of the chute facing the drier, into the regio located above (Claim 13). In such an implementation 1 0 form of the sub' ct of the invention, the effect of the blower unit is ltheirfr ated by me-ang -f the fliirlised haed mentioned previously. The invention will be explained below in detail with the 4 4 assistance of 'the drawings which show in a greatly simplified, sketch-like manner two implementation examples of the subject of the invention. There: 4 4 8 )44 Figure I shows a vertical section through a filling device installed in series ahead of the tubular drier together with a part of the inlet end wall of the tubular drier.

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Figure 2 shows a section along line II II in Figure 1, 4t* C r Figure 3 shows a view from above of the end section of the chute shown in Figures 1 and 2 facing the drier and the associated blower unit and Figure 4 shows to a modified scale a vertical part section through the filling device in accordance with Figure 1 in the area of the end section of the chute facing the drier together with the pivotably supported blower unit.

The filling device installed in series ahead of a tubular drier incpoporates as known principal components a plate-shaped* chute with two guide walls delimiting its sides and above the chute a regulating (control) gate operating in the manner of a weir, which is maintained adjustably at a specific height 0in the direction of the double arrow in the guides between the guide walls The chute is hinged to the gui&e walls (and to the accessories attached to it) within the direction of the double arrow around a pivot axis which is perpendicular to the drawing plane.

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It O oD The lower end section (2a) of the chute faces the inlet end side of the tubular drier which has a drum-like external shape.

The drying tubes (10) emanating from the inlet end wall are rotating together with it in a clock-wise direction (arrow in Figure 2) around a stationary supporting shaft which is inclined, in the same manner as the drier tubes, under an flat angle with respect to the horizontal. Heating of the drier tubes is achieved by means of a gaseous medium, which is being injected in the region of the supporting shaft (12) and flows past the drying tubes within the inner space of the tubular drier drum body.

1 0 Theguide walls which are only pivotable terminate at a short distance in front of the rotating inlet end wall The an gle of incline of the chute with respect to the horizontal is being adjusted by means of the pivot arm (8a) acting upon it o.n O.cue- (as We.ll as the guide walls to sucht-~late- angle, that the material to be dried (for example wet brown coal B, still reaches the inlet end wall reliably with the smallest possible sliding velocity and slides from there into the drier tubes where the drying process takes place. The sliding process may be influenced there by the lifting or the lowering of the control gate its movement will cause an increase or a reduction of the available 2 flow cross sectional area. In the vicinity of the inlet end wall, the brown coal is subjected to loosening up. Thiqarea is designated with In the implementation example shown (see Figure the components 2 and 4 are .mutually associated in such a manner, that their mutual distance diminishes in the direction towards the rotation axis (12) of the tubular drier. In the -case of a horizontal arrangement of the lower edge (4a) of the control gate, -o -Form o. o.cofethe chute will rise under a angle in the direction towards the rotation Shaft can t.hrfr bac alo kpconstructed in a hinged manner with reference to a plane, which is perpendicular to the plane of the drawing.

A bottom wall (13) is attached between the guide walls which screens off the area between the guide walls 'and the inlet end wall (9 underneath the chute in a down wards direction (see also Figure It will yet be described, that the bottom wall may be utilised, if required, for the generation of a so-called fluidised bed.

To improve the effect of the filling device with the principal components 3, 4, 13) and thus to improve the economics of the tubular drier as well, a blower unit (14) is fitted to the underside of the chute -i 0on C' VC i 00 V 0C 00 0 00i iR-, 1 7iai r ~_i

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r 1 which incorporates a hollow beam (15) equipped with blower in the end region of the chute (2a) facing the drier. This protrudes in the manner of an extension beyondthe end section (2a) facing the drier and is dimensioned with respect to its length in such a manner, that it extends at least approximately over the whole width of the chute (that is in Figure 1 transversely to 'the plane of the drawing).

The external contour (15b) of the hollow beam facing the inlet end wall which is also formed by the blower openings (15a) runs in accordance with Figure 1 approximately in parallel with the chute and 1 0 includes with the inlet end wall an acute angle A fine adjustment of the position of the hollow beam (15) is made possible with respect to the components and in that the hollow beam is attached to guide rods (16) (see Figure 3) which themselves (for t rt 4 it:t 4 *1 L example by means of a toothed rack and pinion drive or actuator assemblies) 4 are retained longitudinally movable within guide consoles (17) underneath the chute The thus resulting displacement of the hollow beam (1 5) is indicated in Figure 1 by a double arrow (18).

t, By moving the hollow beam (15) in parallel with the chute the distance between the blower openings (15a) (which, in the side view are 2_ 0 pointing approximately perpendicularly to the inlet end wall can be adjusted with fine adjustment for the purpose of matching the respective operating conditions, particularly for the purpose of matching the properties of the brown coal to be dried.

S c The blower openings (15a) of the hollow beam (15) are constructed for preference in the shape of slots and are mutually displaced (in the manner of- Venetian blind)in the direction towards the inlet end wall (9) of the tubular drier facing them, in the manner of shelves. This results in that the lower opening protrudes further in the direction towards the inlet end wall than the adjacent blower opening located immediately above (see in that respect also particularly Figures 3 and 4).

The rotational movement of the tubular drier in the direction of the arrow (11) (Figure 2) results in that, if the inlet end wall surface (9) is uniformly covered with drier tubes considerably more drier tubes enter the area of the blower openings in the outer area than in the vicinity of the rotational shaft An essential characteristic of the subject of k i ii

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1 7 4 tt It Ie r C fC the invention consists in that the blower unit be matched to the described conditions by the means, that the hollow space of the hollow beam is subdivide:,'. by partition walls (15c) (see Figure 3) into adjacent, mutually independent sectors (15d) to (15g). Each sector may be connected by means of its own supply line (20) which is equipped with a throttling valve (19), to a source of pressure medium.

It is also possible, by means of different settings of the throttling valves to feed diminishing quantities of air in the direction toward the rotational shaft (12) through the associated sectors (15d) and 1 0 Additionally or instead, the blower openings of the individual sectors may also be constructed differently. This can be achieved in a simple manner by.mneans, that the cross sectior,.s blower areas available for the

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individual sectors are becoming smaller from one sector to another in the direction towards 'i.e rotational shaft (12).

As a result of using the blower unit (14) and the fact already mentioned, that the blower openings are pointing approximately perpendicularly to the inlet end wall the brown coal to .e dried is not only being ,loosened up in the transfer region of the chute that is in the area in of the end section (2a) facing the drier, but also accelerated, particularly in the direction towards the inlet end wall and the drier tubes (10) emanating from it. The formation of caking or of plugs in the particularly endangered transfer region is thus extensively counteracted.

The source of pressure medium, through which the supply lines (20) are being supplied with compressed gas (normally air), is designated in Figure 1 (in a purely schematic manner) with (21).

The filling equipment in accordance with the invention can be further equipped in the manner, that the floor wall (13) incorporates in the area underneath the end section (2a) of the chute facing the drier, holes (13a) drilled through the floor and pointing upwards and forms there also a pressure plenum This can be fed with compressed gas in a measuredout manner through a pressure line (23) and a throttling valve which may be supplied in particular:from a pressure source (21) (Figure For the purpose of matching different operating conditions, thie pressure plenum (22 (corresponding to the construction of the hollow plenum can be subdivided into several mutually separated sectors located side by side, whereby these may incorporate mutually variously constructed and/or variously arranged drilled holes (13a) in the bottom.

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-8 1 6 *9 4 El U 6 In the implementation example of the subject of the invention described so far, the hollow beam (15) can only be displaced with respect to the chute in the longitudinal direction of this latter.

An additional possibility for adjusting the position of the slotlike blower openings (15a) can be brought about by the means of suspending the hollow, beam (15)(in accordance with Figure 4) in a hinged manner around the axle (25) from the guide rods (16) and by equipping the components (16) with suitable locking elements. The hinged arrangement of the hollow beam is of course conditional upon the supply lines (20) being constructed O at their point of connection with the hollow beam in an adequately movable or resilient manner.

By pivoting the hollow beam (15) with respect to the chute (2) it is possible to alter the angle o( between the external contour (15b) and the inlet end wall with the result, that there will also be a change in the direction of the blower openings (15a) with respect to the inlet end wall In this manner it will be possible to exert an additional influence of the effect of the blower unit (14) onto the brown coal which is to be transferred into the tubular drier and in particular by the means of setting a gas flow (in the general case of an air flow) which is directed upwards to Sa greater or a lesser degree.

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Claims

1. A filler device for a tubular drier rotating around a stationary shaft, with a chute pivotable, in front of a tubular drier inlet end wall, between two lateral guide walls, with a control gate which is retained in a height adjustable manner above the chute and with a floor wall which screens off the region between the guide walls and j the inlet end wall in a downward direction underneath the chute, whereby the distance between the chute and the control gate, seen over the width of these components, can be adjusted, characterized in that the chute incorporates a blower unit which protrudes beyond an end section of the S: chute and faces the drier with blower openings of the blower unit pointing towards and adjustably spaced from the inlet end wall.

2. A device in accordance with Claim 1 characterized in that the blower openings are located underneath the chute.

3. A device in accordance with Claims 1 or 2 characterized in that the blower openings are constructed as slots and are arranged mutually displaced in the direction of the inlet end wall in the manner of a venetian blind. A device in accordance with any one of the Claims 1 to 3 characterized in that an angular position of the blower openings with respect to the inlet end wall, is adjustable. S, i 5. A device in accordance with any one of the Claims 1 to 4, characterized in that an extension line through the blower unit, which includes the blower openings, forms an -acute angle with the inlet end wall.

6. A device in accordance with any one of the Claims 1 to 5 characterized in that the blower openings, when f viewed from the side, are aligned approximately 1 perpendicular to the inlet end wall. i 3i Ar -N Z C 1 1 1 -J -Lieea~~a~.th e side;!: 8e..aliged pproimaely ;r ;-1 i 'i~i~~l i ~R sQ ,q !^^'^^'aisrw~afi^ W 10 *c tn R# 1 I a t%~l r* a, a a, r *i fa, *4 :r orl a, 40a fc a, aOQ -c

7. A device in accordance with any one of Claims 1 to 6, characterized in that the blower openings, when viewed over the width of the chute, are partitioned into mutually independent sectors.

8. A device in accordance with any one of the Claims 1 to 7, characterized in that the amount of air flowing through each of the blower openings when viewed over the width of the chute, is independently controllable.

9. A device in accordance with any one of the Claims 1 to 8, characterized in that the blower unit incorporates a hollow beam incorporating the blower openings, the width of this hollow beam corresponding approximately to that of the chute.

10. A device in accordance with Claim 9, characterized in that the hollow beam is attached and is movable in the longitudinal direction of the chute by means of guide elements.

11. A device in accordance with Claim 9 or characterized in that the hollow beam is attached in a pivotable manner to the chute.

12. A device in accordance with any one of the Claims 9 to 11, characterized in that the hollow space of the hollow beam incorporates several mutually separated sectors located side by side, which may be connected through individual feed6er lines equipped with throttle valves to a pressure source.

13. A device in ac cordance with any one of the Claims 1 to 12, characterized in that measured quantities of pressurized gas may be injected through the floor wall, which incorporates at least within the region underneath the end section of the chute pointing towards the drier, drilled holes in the floor pointing upwards, into the area located above.

14. A device in accordance with any one of the preceding claims wherein brown coal enters the drier via the device. i 1 I I:1 i I;if. i: E j 1 Y~ i- r :lii 1 A device as described herein with reference to the drawings.

16. A method of controlling the speed of entry of material into a drier comprising feeding the material through a device as defined in any one of the preceding claims and controlling the angle of the chute, the distance between the chute and the control gate, the space between the blower openings and the inlet end wall and the amount of air flowing through the blower openings, to give a desired speed of entry of material.

17. A method of feeding a material into a drier substantially as described herein with reference to the drawings. 0 FRIED KRUPP GESELLSCHAFT MIT BESCHRANKTER HAFTUNG Si t Patent Attorneys for the Applicant: F.B. RICE CO. L A Q' :S .*t 1 1 *w'e-tKK 1 1 1 a-0 1 o em e 1 1 *9 t aV 1 1 1 1 1 1 1 t. ~T W 1 1 1 s