WO2002030555A9

WO2002030555A9 - Method and device for thermally treating a material in pulverulent or granulate form

Info

Publication number: WO2002030555A9
Application number: PCT/EP2001/011684
Authority: WO
Inventors: Michael Witt; Thomas Kessler; Karl-Peter Farwerck; Kasper Evertz
Original assignee: Basell Polyolefine Gmbh; Michael Witt; Thomas Kessler; Karl-Peter Farwerck; Kasper Evertz
Priority date: 2000-10-13
Filing date: 2001-10-10
Publication date: 2003-12-11
Also published as: WO2002030555A1; DE10050720A1; CN1630550A; EP1330304A1; AU2002215934A1; US20040093759A1; JP2004518931A

Abstract

The invention relates to a method and a device for thermally treating solid matter in pulverulent or granulate form using gaseous streams (7, 16, 22, 23, 24), by means of a body (2), which is displaced about its rotational axis (1). According to said method, the following steps are performed in succession: the bulk goods contained in segments (3) of the displaced body (2) are first heated by exposure to water vapour (22). The heated bulk goods are then subjected to an air supply (23) and/or an inert gas supply (24) in one or more subsequent steps. Finally, the goods that have been dried and/or rendered inert are removed (17) from the segments (3) of the body (2) that is displaced about its rotational axis (1).

Description

Process and device for the thermal treatment of powder or granular material

The invention relates to a method for the thermal treatment of solids in powder or granular form by means of gas streams using a body which can be moved about an axis of rotation.

In many technical processes, it is necessary to heat a material in powder or granular form. It is particularly economical to use the steam supply that is usually available in production plants, which generally represents a particularly cheap energy source, especially in comparison to electrical energy. Bulk flow heat exchangers are known for heating powdered or granular material, which carry out the heating of the product via pure heat conduction. The areas required for heat conduction are relatively large, so that bulk flow heat exchangers are associated with a large size and consequently take up a lot of space.

Another way of heating powdered or granular. Material consists in the use of heated mixers, whereby both the housing surfaces of a heated mixer and the mixing tools themselves can be heated. Due to the rapidly renewing contact surface, significantly better heat transfers are achieved here compared to the bulk flow heat exchanger, so that overall smaller apparatus sizes can be achieved. The disadvantage of heated mixers can be seen in the fact that a not inconsiderable effort in the form of the mixer drive, the control, the supply and discharge of the product has to be operated, so that, for example, retrofitting of existing extrusion systems and extrusion lines is generally not possible or can only be realized with considerable effort. If steam is introduced directly for drying or conditioning solid matter in powder or granule form, rapid heating is achieved due to the high heat of condensation. If saturated steam is also used for heating with steam, local overheating can occur damage to the powder or granules to be heated can be reliably avoided. The disadvantage of using steam as the temperature control medium is that the condensate formed can only be removed again with relatively great effort. For this reason, targeted heating with steam of solids in powder or granular form, for example pourable polymer solids, has generally only been possible in those technical processes in which the resulting residual moisture in the heated product does not have any serious disadvantages in the process steps following the heating process entails. Aftertreatment of the heated product to remove the residual moisture would be a subsequent step to be carried out at great expense.

In view of the current methods of drying solids in powder or granule form and the disadvantages mentioned, associated with the previous methods, the object of the invention is to achieve a conditioning of solids in powder or granule form such that both solids in which oxygen residues can remain in the product to be processed, and solids in which no oxygen residues may remain in the product to be processed can be directly conditioned by means of direct steam injection.

According to the invention, this object is achieved in that in a method for the thermal treatment of solids in powder or granule form with gas streams, the following process steps are successively carried out by means of a body moved about an axis of rotation:

The heating of the bulk material taken up in segments of the movable body by exposure to water vapor,

- exposing the heated bulk material to an air and / or an inert gas supply in one or more subsequent steps, - The removal of the drying or inertized bulk material from the movable body.

The advantages of the method proposed according to the invention can be seen above all in that the product throughput can be set in a targeted manner by regulating the rotational speed of the moving body about its axis of rotation by means of the body moving about its axis of rotation, which contains cells configured in segments. The moving body is preferably a single cell wheel containing cells which are arranged separately from one another and whose chambers are open in the radial direction. Due to the very small structural size of the moving body and the substitution of an existing metering device, the method proposed according to the invention can easily be subsequently integrated into existing process chains in extrusion lines or extrusion machines. It is irrelevant whether the body moved about its axis of rotation is operated in a horizontal arrangement or whether the body moved about its axis of rotation is operated in a vertical arrangement.

In an advantageous development of the method proposed according to the invention, the individual segments of the rotating body are loaded or emptied over the outer circumference when the body moving about its axis of rotation is arranged vertically. Both the steam, in particular saturated steam, air, and an inert gas, for example nitrogen, can be introduced into the individual segments or chambers via the outer circumference of the moving body. For steam charging, for example, a perforated segment can be provided on the outer ring of the body configured as a cellular wheel and moving about its axis of rotation.

According to an embodiment variant of the method proposed according to the invention, the bulk material, be it in powder form or in granulate form, can be added to the individual segments of the cellular wheel on the outer ring of the moving body, and via the outer ring after almost one revolution from the individual segments of the body moving about its axis of rotation be emptied. When operating a moving body, divided into individual segments, both the bulk material from the outer circumference and the air entering from the outside can be supplied from outside the moving body. In Both the steam and the gas stream entering via the outer surface can advantageously be removed from the individual segments via lines formed in the hub of the cellular wheel. The steam flow introduced on the outer circumferential surface of the cellular wheel, after its condensation and flow through the cells, together with their contents, can be collected at the hub of the cellular wheel and removed from there via a discharge line running coaxially to the axis of rotation from the vane cellular wheel.

In a manner supporting the emptying of the individual segments of the cell wheel rotating about its axis of rotation in a vertical arrangement, a gas stream, for example a nitrogen stream, can be introduced from the hub of the cell wheel rotating about its axis of rotation in a vertical arrangement. In the inert gas supply line, which runs coaxially to the axis of rotation of the cellular wheel, nitrogen flows from the hub of the cellular wheel rotating about its rotational axis into the individual segments, flows through the bulk material present there and supports the product discharge from the individual segment chambers at the product discharge point at the product discharge point of the cellular wheel. After the individual segment cells on the cell wheel have been completely emptied, the cell wheel rotates, for example, clockwise in the direction of the product entry, so that the cells passing the product entry can be loaded with new product to be treated.

In order to ensure the supply of the solid or powdered or granular form into the individual segments of a cell wheel moved about its horizontally oriented axis of rotation, a bulk material supply is assigned to the outer circumference of such a cell wheel. According to an advantageous embodiment variant of the method proposed according to the invention, the moving body can also be operated in a horizontal arrangement, so that the bulk material accommodated in the segments can be acted upon by gas flows parallel to the axis of rotation of the body rotating about its axis of rotation. In a horizontally operated cell lock lock configured in this way, the gases preferably enter the bed from above and flow downward. In this case, the moisture can be separated off, supported by gravity. If the moving body is operated in a horizontal arrangement, the individual segments charged with bulk material, stationary lines are provided both for bulk material, for steam or in particular for gases or inert gases and a stationary extraction line. The individual segments carried out on the moving rotating body configured as a cellular wheel (for example as a vane wheel) can be provided with cover surfaces in an alternating sequence. The cover areas can optionally be provided. The alternating order of the cover surfaces can be chosen differently on the bottom and on the cover of the cell wheel operated in a horizontal configuration, for example as an inlet or outlet for the bulk material, as cover surfaces arranged in segments in an alternating arrangement without gas passage and for example perforated segment surfaces which allow gas passage. If a vane cell wheel is used as the moving body, segments are created that are pie-shaped and are separated from one another by partitions.

In an advantageous embodiment of the method proposed according to the invention, solids can be treated in a movable body divided as a cell wheel by segment walls in individual cells in such a way that oxygen residues can remain in the solid which do not interfere with further processing. In this variant of the method, drying can be largely supported by the air access, so that air access is sufficient at the cell wheel moved about its axis of rotation (in a horizontal arrangement).

If, on the other hand, polymers are processed, for example when compounding polyethylenes, where the residual oxygen content often poses a problem and is extremely disruptive during further processing, the body in the segments of the moving body, which is designed as a cellular wheel, can be conditioned by means of steam for heating, which then leads to inerting of the bulk material with inert gases. To facilitate the passage of gas, the bulk material being said to remain in segments, the outlet surfaces and possibly the access surfaces are designed as a perforated grid arrangement.

Thus, the method proposed according to the invention can be used both for solids in which a residual oxygen content may remain, with the invention proposed methods can be implemented just as well on solids in powder or granular form, in which a residual residual oxygen content in the solid is critical. This is met by the number of air or inert gas inlets or outlets on the cellular wheel, which can be provided as an exemplary embodiment of a moving body.

According to the invention, the object is further achieved by a device for the thermal treatment of solids in powder or granular form with gas streams by means of a body which can be moved about its axis of rotation and which comprises individual segments, covers being provided in segments in the lid and in the bottom of the movable body allow bulk material or gas flow to enter or exit.

By means of a rotating device provided with an external drive, the product throughput can be individually adjusted and influenced in accordance with the system requirements, for example for the supply of extruder raw materials. The moving device, which is designed to rotate about its axis of rotation, be it in a vertical or in a horizontal arrangement, can be configured as a cellular wheel, the cellular wheel hub having discharge lines for steam condensate and gas and supply lines for gas to support the emptying of the individual segments over the circumference of the cell wheel acting as a moving body can have.

The invention is explained below with reference to the drawing.

It shows:

FIG. 1 is a side view of a moving body operated in a vertical arrangement with product and product discharge and gas entry over the outer circumferential surface,

Figure la a vane wheel FIG. 2 shows a cellular wheel arrangement shown in perspective, with an associated supply shaft,

FIG. 3 shows a cell wheel operated in a horizontal orientation, rotating about its axis of rotation with schematically drawn in and out of bulk goods and

Steam or inert gas supply lines, arranged in a stationary manner,

Figure 4 shows a cover configuration of a cellular wheel for drying mainly with

Air and subsequent inerting,

FIG. 5 shows the bottom configuration of a moving body for drying with air according to FIG. 4 with perforated surfaces that allow the gas to escape, covering the segments,

FIG. 6 shows a cover configuration of a cellular wheel functioning as a moving body for heating and optionally inerting the product,

7 shows the configuration of the base part of a cellular wheel belonging to the base configuration according to FIG. 6.

1 shows a side view of a cell wheel operated in a vertical orientation.

FIG. 1 shows a cellular wheel 2 rotating about an axis of rotation 1, which rotates, for example, clockwise 26 about the axis of rotation 1. The cell pad 2 is divided into individual cell wheel segments 3, the individual segments 3 being formed from segment walls 6 starting from the hub of the cell wheel 2. The segment arch of a segment is shown as an example with reference number 3.1. In this configuration, the loading or emptying of the individual segments 3 takes place over the outer circumference, on which both a bulk material feed 4 and a bulk material discharge 5 and a steam inlet 16 are indicated in a schematic manner. The individual segments 3 of the cellular wheel 2 are loaded via the feed or discharge points mentioned, whereby Coaxial to the axis of rotation 1 in the area of the cellular wheel hub, outlet lines for steam condensate or air discharge lines which are set up can be provided.

For example, while the bulk material can be fed into the individual segments 3 of the cellular wheel 2 via the bulk material entry 4, an inert gas flow which generates radially from the inside in each segment 3 of the cellular wheel can also be produced via a feed line for inert gas which also runs coaxially with the axis of rotation 1 of the cellular wheel 2 Generate 2. This inert gas flow direction can advantageously be set in the radial direction to the outside immediately before or during the point in time at which the segment bend 3.1 of a segment 3 now containing bulk material lies opposite a product discharge 5. At this time, the emptying of the respective segment 3 of treated bulk material is supported by the inert gas flow taking place from the inside, so that its complete emptying can be ensured. Upon further rotation of the cell wheel 2 about its axis of rotation 1 in the clockwise direction, untreated bulk material can again be introduced into the emptied cell 3 into the segment cell of the cell wheel 2, which is emptied in this way, via the bulk material feed 4, via the segment sheet 3.1.

After the bulk material has been fed in via the bulk material feed 4, passage of the steam inlet 16, the opening of which comprises only a fraction of the segment arc 3.1, can result in air or inert gas charging 23, 24 via the outer ring on the segments 3 contained in the bulk material to be treated. Steam 16 or condensate which is produced is discharged through the outlet line 8 which runs coaxially with the axis of rotation 1. An air inlet 23, which can be optionally provided, can also be provided on the outside of the cellular wheel 2 via the outer surfaces (segment arc 3.1) of the respective segments 3 of the cellular wheel 2 , The air flowing in from the outside, which dries the bulk material contained in the individual segments 3, can likewise be discharged from the individual segments 3 via the derivatives provided in the area of the cellular wheel hub.

In contrast, the inert gas flow direction 9 can be handled by the individual bulk material that is now treated, ie. heated and dried cells containing bulk 3 in Set the manner already mentioned above, so that the inert gas flow 9 running from the inside to the outside through the segments 3 allows complete emptying of the individual segments 3 of the cellular wheel 2 with respect to the bulk material removal 5.

Figure la shows the schematic representation of a vane wheel.

The vane cell wheel 2, which is rotatable about its axis of rotation 1 and which is preferably used as a moving body, rotates relative to a boundary surface (not shown here). When installed in a vertical arrangement 28, it rotates with respect to two laterally arranged, stationary receiving boundary surfaces; when in a horizontal arrangement 29, relative to a bottom surface and top surface. If the vane wheel according to FIG. 1 a is arranged horizontally, an upper cover can be provided, but this is not absolutely necessary. The individual segments 3 which are open in the region of the segment arch 3.1 are separated from one another by segment walls 6. The direction of rotation of the vane wheel 2 used as a moving body corresponds to the clockwise direction in the configuration according to FIG. 1 and la; however, the direction of rotation could also be reversed if the entry and exit surfaces were adjusted accordingly.

A perspective view of FIG. 2 shows in more detail a cell wheel 2 which can be rotated in a vertical arrangement 28 about its axis of rotation and which is supplied with bulk material over its outer circumference via a bulk material feed device 10 shown in a schematic configuration. Not shown here, there is a bulk material supply above the bulk material shaft, via which bulk material is continuously present at the bulk material feed device 10. The opening of the bulk material chute can advantageously be adapted to the outer circumference of the circumferential surface of the cell wheel serving as rotating body 3 and can only cover a fraction of the segment sheet 3.1 of a segment 3 of the cell wheel 2 that is to be filled or loaded with its opening area 13. In contrast, the opening can also sweep over the entire segment arch 3.1 between two adjacent segment walls 6.

Reference number 5 denotes the bulk material removal point, which is not shown in any more detail here (see illustration according to FIG. 1).

In the case of a vertical arrangement 28 of the cellular wheel 2 functioning as a moving body, the bulk material discharge 5 is preferably located on the underside in order to empty the individual product containing the product, in addition to the inert gas flow 9 running radially from the inside through the individual segments 3 To ensure cells 3 of the cellular wheel 2.

From the illustration according to FIG. 3, a cell wheel 2 operated in a horizontal orientation is shown in a schematic arrangement. The bodies configured as cellular wheel 2 and rotating about the axis of rotation 1 in the clockwise direction 26 contain individual segments 3, which are separated from one another by segment walls 6 extending in a star shape over the hub. The height of the individual segments 3 of the cellular wheel 2 is identified by reference numeral 18. In the upper part of FIG. 3 there is the cover system of the cellular wheel 2, which is not shown in detail here, but which is explained in more detail below, which can optionally be provided with a horizontal arrangement 29. In particular, the perforated segments that allow gas access are optionally provided. On the underside there is the bottom region of the cellular wheel 2, which is not shown in more detail in FIG. 3 but is configured in more detail in FIGS. 5 and 7. At this point, the bulk material to be treated, which is in powder or granule form, is introduced into the individual segments 3 of the cellular wheel 2. According to the illustration in FIG. 3, a cellular wheel 2 is provided, from which, identified by reference numeral 17, a product is discharged into a further processing unit (not shown here), for example an extruder. The segment 3 of the cellular wheel 2 just filled with bulk material to be treated in powder or granule form rotates clockwise 26 about its axis of rotation 1 oriented in the vertical direction as shown in FIG. 3. The bulk material contained in the segment cell 3 is separated by the heated with reference numeral 16 or 22 provided steam entry in the corresponding segment 3 in stationary form.

After the steam input for heating the bulk goods stored in the corresponding segment 6, the drying takes place. Steam entry, inert gas supply and an optional air inlet can be provided stationary on the top of the cellular wheel 2. It is particularly preferred to carry out the steam introduction on the segmented areas configured as pie pieces. With the configuration of the moving body, configured as a cellular wheel 2, operated in a horizontal arrangement 29, the gas escapes on the underside of the cellular wheel 2. For this purpose, the bottom region of the cellular wheel 2 is Figure 3 - although not shown here - provided with gas permitting surfaces.

4 shows the lid area of a movable body 2, which is designed as a cellular wheel and is used essentially for drying the solid in powder or granular form with air.

An optional cell cover made with reference numeral 19 is divided into individual segments 3 by segment walls 6 as shown in FIG. 3. Reference number 4 denotes the product entry to be made in segment 3, while the segment 3 lying next to it in the clockwise direction 26 is closed by a fixed cover 21. The segments 3 appearing as white areas in FIG. 4 represent the segments 3 of the cellular wheel 2, which moves clockwise 26 about its axis of rotation 1, taken in a vertical arrangement. Through the opening of the corresponding segment 3, which is released at 4, solids can consequently enter this segment 3. In the segment 3 lying next to it in the clockwise direction 26, the bulk material is not treated; in the adjoining segment 3, viewed in the clockwise direction 26, a steam supply 22 takes place. The outer arc of the segment 3 is designated by reference number 3.1. After the D-vaccine has been supplied, that is to say that the bulk material supply recorded in segment 3 has been heated, the bulk material is supplied to an air supply 23, whereby drying takes place. 4, the cover area 19 of a cellular wheel 2, the inert gas feeds are designed as stationary nitrogen lines 24 in FIG.

In the example shown here of a cover configuration 19 of a cellular wheel 2, two adjacent segments 3 are opened in order to allow inert gases such as CO ₂ to pass through. The white area means a corresponding opening or a plate that allows gas to pass through.

It is obvious that, depending on the nature, heating requirements, degree of moisture and grain size of the bulk material in powder or granular form, steam can be supplied to several segments 3 and air to individual segments 3, which supports drying.

The here according to the representation. FIG. 4 segment areas lying next to one another in the lower area and allowing an inert gas supply 24, of which only 2 are shown here, can also extend over more than 2 segments 3 of the cellular wheel 2.

From the representation acc. FIG. 5 shows the bottom area of a cellular wheel 2, which primarily serves to dry a solid by supplying air, wherein oxygen residues which do not impair the further processing of the solid may still be present in the solid to be dried. Reference number 17 denotes segment 3, on which the bulk material picked up in segment 3 during a rotation of cell wheel 2 in the clockwise direction 26 of its axis of rotation 1 has undergone a complete treatment cycle and leaves segment 3 at this point. Reference 17 denotes the product discharge from the respective segment 3.

Depending on the configuration of the cover configuration with regard to passage openings and covers of the individual segments 3 receiving the bulk material, the bottom of a cell wheel 2 serving as a moving body is equipped with both gas passage and solid sheets 25 per segment 3 which prevent the passage of bulk material, whereas from the illustration gem. Figure 5 shows that individual segments 3 can be provided with a perforated or lattice-shaped bottom, which Although the bulk material in the individual segments 3, which are separated from one another by the indicated segment walls 6 of the cellular wheel 2, is retained, it does, however, permit water vapor, inert gas and drying air to pass through. In this way, for example, moist air can leave the cellular wheel 2 downward parallel to the axis of rotation 1 and steam condensate can also be expelled from the individual segments 3 from the bulk material present therein. In the case of the segments 3, which are closed off by a fixed base surface 25 in the form of a piece of sheet metal configured in the form of a pie piece, it is not possible for gas to exit parallel down to the axis of rotation 1 of the cellular wheel 2. The dwell time of the bulk material to be conditioned is a function of the rotational speed of the vane wheel 2 about an axis of rotation 1. Given the dimensions of the cell wheel 2, the effectiveness in terms of heating and drying can be varied with the gas volumes that are passed through.

In the representations acc. FIGS. 6 and 7 show configurations of a movable body which allows solids to be treated in granular or powder form, in which no disturbing oxygen residues which may impair further processing may be present after the treatment. For example, this can be a problem when composing polyethylenes; especially when the products have been pneumatically demanded with air and therefore have a high oxygen content.

In contrast to the lid or bottom configurations acc. The design variants in FIGS. 4 and 5 are in accordance with the design variants. 6 and 7, a larger proportion of segments 3 on the cellular wheel 2 are exposed to nitrogen inert gas inlets 24.1, 24.2, 24.3 and 24.4, whereas an air supply in the individual segments according to FIG. the lid configuration 19 in FIG. 6 is completely omitted. Accordingly, only the inert gas, for example nitrogen, supplied to 4 segments 3 on the circumference of the cellular wheel 2 is used for drying, since a separate air inlet according to the lid configuration in FIG. 4 would further increase the currently undesirable oxygen content of the solid in the form of granules or powder. Accordingly, the bottom side is gem. the representation from FIG. 4 of a cellular wheel 2 used in this way in comparison to the representation of the base area according to FIG. Figure 5 procured differently. In the bottom area shown in FIG. 7, the bottoms of the individual segments 3 are made in such a way that the bulk material remains in them, but inertization of the bulk material contained therein remains possible. The lattice-shaped or mesh-like or perforated bottoms on the one hand allow the bulk material to be conditioned to be retained in the segments 3 of the cellular wheel 2; on the other hand, gas passage can be achieved through the openings provided in the bottom. From the illustration according to FIG. 7 it can be seen that the individual base segments 27.1, 27.2, 27.3, 27.4, 27.5, 27.6 and 27.7 lie next to one another in the direction of rotation 26, ie seen in the clockwise direction. At 17, the product discharge parallel to the axis of rotation 1 of the cellular wheel 2 is possible, at which the product leaves the segments 3 of the cellular wheel 2. With a cell wheel 2 operated in this way in a horizontal arrangement 29, oxygen can be expelled very efficiently from the granulate or solid present in powder form by direct steam introduction on the cover side 19 of the cell wheel 2 and by subsequent inert gas supply at several successive locations.

The expulsion of oxygen is necessary in order to largely prevent degradation, for example. A low oxygen content in the feed stream and in the polymer melt means a higher quality product, which can be classified in terms of quality, for example with regard to the yellowness index.

In addition to a significant improvement in product quality during extrusion, where material supplied only comes into contact with oxygen, for example in the case of pneumatic feeds, the method proposed according to the invention has further advantages:

1. A large part of the energy to be introduced by the heating into the product to be processed can be saved on the extruder with the electrical energy to be supplied become. Since steam is generally available at production sites, there is a significant reduction in the feed-in of energy to the extruder.

Second

With the same product throughputs on the extruders, the

Polymer granules require less electrical energy; the mechanical stress of the

Extruder is reduced. This means advantages in terms of the life of the

Extruders as well as advantages in terms of maintenance cycles.

Third

In the event that the available mechanical drive power of the extruder is a bottleneck in a planned increase in throughput, the material throughput can be increased significantly.

Using an example, the process parameters that are set up and the dimensioning of a cell wheel configured according to the invention are explained in more detail below:

With a mass flow of 6 t per hour of polyethylene grit and an assumed number of revolutions of the cellular wheel of one revolution per minute. 100 kg of polyethylene grit are passed through the cellular wheel 2 per minute. 10 segments or chambers 3 are assumed per cellular wheel 2, i. H. each segment takes about 10 kg of polyethylene d. H. a volume corresponding to 20 1. The total volume of cell mass 2 must therefore be designed so that 200 l of material can be taken up.

Assuming a cellular wheel 2 with a diameter of 1.5 m, which corresponds to an area of 1.76 m ² , the overall height 18 of the cellular wheel 2 is approximately 11.3 cm.

0.5 t steam per hour, which is about 800 m ^{3, is used to} heat the polyethylene grit or the bulk material in granular or powder form from 20 to 100 ° C corresponds per hour. This means that 13 m ³ can be pushed through the cellular wheel 2 per minute. This corresponds to a volume flow of 200 1 steam per second. Assuming the flow velocity of the steam is about 4.5 km / h. the average residence time of the material in powder or granule form in the steam stream is about 6 seconds.

LIST OF REFERENCE NUMBERS

1 axis of rotation

2 cellular wheel

3 cellular wheel segment

3.1 segment arch

4 Bulk material supply

5 bulk material removal

6 segment wall

7 air intake

8 exit

9 Inert gas flow direction

10 bulk goods air shaft

11 Bulk stock

12 Bulk material outlet

13 opening area

14 cell width

15 Extending the opening

16 steam admission

17 Bulk material removal

18 cell wheel height

19 cell cover

20 cellular wheel bottom

21 closed segment

22 Steam supply

23 Air supply

24 Inert gas supply 24.1 24.2 24.3 Inert gas segments 24.4

25 sheet

26 direction of rotation

27 perforated segment floors

Gas outlet segments

28 Vertical arrangement

29 Horizontal arrangement

Claims

1. Process for the thermal treatment of solids in powder or granule form with gas streams (7, 16, 22, 23, 24) by means of a body (2) moved about an axis of rotation (1) with the following process steps to be carried out successively:

- The heating of the segments (3) of the body (2)

Bulk goods by exposure to water vapor (22),

the exposure of the heated bulk material to an air supply (23) and / or an inert gas supply (24) in one or more subsequent steps

the removal (17) of the dried or inertized bulk material from the moving body (2)

2. The method according to claim 1, characterized in that the segments (3) of a vertical arrangement (28) operated rotating body (2) are loaded / emptied over its outer circumference.

3. The method according to claim 2, characterized in that bulk goods on. Outer ring of the moving body (2) supplied to the segments (3) and this on

Outer ring of the movable body (2) are emptied.

4. The method according to claim 1, characterized in that in inert gases (24) and / or steam (16, 22) enter laterally into the segments (3) of the body (2) moving about its axis of rotation (1).

5. The method according to claim 2, characterized in that the steam and air inlet (7) on the outer circumference of the movable body (3).

6. The method according to claim 5, characterized in that steam, air, inert gas on the hub (8) of the moving body (2) after flowing through the segments (3) emerge in the radial direction.

7. The method according to claim 2, characterized in that the gas is applied to the segments (3) in the radial direction (9) from the inside to the outside.

8. The method according to claim 2, characterized in that a supply of bulk material (10, 11, 12) is assigned to supply the segments (3) of the body (2) to the outer circumference of the body (2).

9. The method according to claim 1, characterized in that the segments (3) of a horizontal arrangement (29) operated moving body (2) parallel to the axis of rotation (1) of the moving body (2) with gas flows (4, 16, 22, 23 and 24) are applied.

10. The method according to claim 9, characterized in that the moving body (2) on the cover side (19) with the segments (3) in alternating order covering surfaces (25) is provided.

11. The method according to claim 9, characterized in that the moving body (2) on the bottom side (20) has a segments (3, 17) with outlet for the treated bulk material and segmented cover surfaces (25) and with the gas outlet-making possible segment surfaces ( 27) is provided.

12. The method according to claim 9, characterized in that in the horizontal arrangement (29) of the moving body (2) the expulsion of moisture in the direction parallel to the axis of rotation (1) is supported. ,

13. The method according to claim 9, characterized in that the bulk material received in the segments (3) is subjected to drying by air (7, 23) with a permissible residual oxygen content of the bulk material.

14. Procedure according to. Claim 9, characterized in that the bulk material to be freed from oxygen is rendered inert by direct steam introduction (22) and supply of inert gas (24).

15. Device for the thermal treatment of solids present in powder or granule form with gas streams (7, 16, 22, 23, 24) by means of one around it

Rotation axis (1) of moving cellular wheel (2), which comprises individual segments (3), characterized in that covers (21, 25, 27) are provided in segments in the cover (19) and in the bottom (20) of the moving cellular wheel (2) that allow entry or exit of bulk material or gas flows (22, 23, 24).

16. The apparatus according to claim 15, characterized in that the moving body (2) is designed as a cellular wheel, which is movable about its axis of rotation (1) and in the cellular wheel derivatives (8) for steam condensate, air and supply lines for inert gas to support Emptying the segments (3) are provided.

17. The apparatus according to claim 15, characterized in that above the rotating about its axis of rotation (1) rotating cell mass (2) a stationary gas access and the access of bulk material allowing cover (19) is received and below the rotating around its axis of rotation (1) Cell wheel (2), a stationary cover (20) with bulk material removal (17) and segments (27) permitting gas passage is accommodated.

18. The apparatus according to claim 15, characterized in that the segments (3) of the moving body (2) are flowed through in the vertical direction.

9. The device according to claim 15, characterized in that the segments (3) of the moving body (2) are flowed through from outside to inside or from inside to outside by steam, air, inert or drying gas.