JP2004518931A - Method and apparatus for heat treating powdery or granular material - Google Patents

Abstract

The present invention relates to a method for heat-treating a powdery or granular solid substance in a gas stream (7, 16, 22, 23, 24) using an object (2) moving around a rotation axis (1). . In this method, the following steps: first, the step of heating the bulk material supported by the plurality of sections (3) of the object (2) by exposing it to water vapor (22); Supplying air (23) and / or inert gas (24) produced in one or more steps, and finally removing dry or passivated bulk material from the moving object (2); Done in
[Selection diagram] Fig. 1

Description

[0001]
The present invention relates to a method and an apparatus for heat-treating a powdery or granular solid substance by means of a gas flow using an object which can move around a rotation axis (1).
[0002]
In many industrial processes, it is necessary to heat powdery or granular materials. For this purpose, the use of a steam supply, which is usually used in a manufacturing plant and generally represents a special low-cost energy source, has a particularly cost-saving effect and in particular compared to electrical energy. That's right. In order to heat powdery or granular materials, a large stream of heat exchange is known, which simply heats the product by heat conduction. High-volume heat exchange requires a relatively large surface area for heat transfer, which results in a large overall size and therefore a considerable space requirement.
[0003]
Another method for heating powdered or granular materials is to use a heated mixture, which requires heating both the housing surface of the heating mixer and the mixing tool itself. Considering the rapidly renewing contact surfaces, a considerably better heat transfer is achieved here compared to the heat exchange of large flows. Therefore, the entire size of the apparatus can be reduced as a whole. The disadvantage of heated mixers is that trivial effort has to be devoted to the design of the mixer drive, control system and product transfer to and from the mixer, such as existing extrusion systems and extrusion lines Refurbishment is generally not possible or can only be achieved with considerable effort. If steam is introduced directly to dry or adjust the state of the powdered or granular solid material, rapid heating is achieved due to the high heat of condensation. Furthermore, when using saturated steam when heating with steam, it is possible to stably avoid that the powder or granules are partially overheated, thereby damaging them. The disadvantage of using steam as the temperature control medium is that the condensate formed must be removed again with relatively great effort. For this reason, the use of steam for selective heating of powdered or granular solid materials (eg, free-flowing solid polymeric materials) has heretofore been a problem in which the residual moisture of the heated product has been critical in the steps following the heating step. This was only possible in an industrial manner without disadvantages. Subsequent processing of the heated product to remove residual moisture will be the next step involving considerable effort.
[0004]
In view of the commonly used methods for drying powdered or granular materials and the disadvantages associated with existing methods, it is an object of the present invention to provide a method for drying solid materials and oxygen whose residual oxygen is in the product to be treated. It is an object of the present invention to provide a method for controlling the state of a powdery or granular solid substance, in which both the remaining solid substance which is not present in the product to be treated is regulated by direct supply of steam.
[0005]
According to the invention, the object is
A method for heat-treating a powdery or granular solid substance with a gas flow using an object moving around a rotation axis, comprising the following steps:
Heating the bulk material supported by the plurality of sections of the object by exposing it to water vapor (22);
Supplying the heated bulk material with air and / or an inert gas generated in one or more lower steps;
Removing dry or passivated bulk material from moving (possible) objects
Is carried out continuously.
[0006]
The advantages of the method of the invention are, in particular, that the product throughput can be reduced by using objects moving around the axis of rotation (including cells designed for each section), It can be seen that the speed can be set explicitly by controlling the speed automatically. The moving object is preferably a single cellular turntable comprising radially open chambers arranged separately from one another. Due to the extremely small overall size of the moving objects and the ability to replace existing metering devices, the method proposed by the present invention can be used as a retrofit (modification) means without any problem in an extrusion line or extruder in an already existing processing sequence. Can be incorporated into In this case, it does not matter whether the object moving around the rotation axis is driven in the horizontal direction or the object moving around the rotation axis is driven in the vertical direction.
[0007]
An advantageous development of the method according to the invention is that if the arrangement of the objects moving around the axis of rotation is vertical, individual sections of the rotating object are filled and emptied via the outer circumference. Air or an inert gas (eg, nitrogen) as well as water vapor, especially saturated vapor, can be introduced into the individual sections or chambers via the periphery of the moving object. For filling with water vapor, a perforated section can be provided on the outer ring of an object moving around an axis of rotation, designed for example as a cellular wheel.
[0008]
According to one possible variant of the method according to the invention, the powdery or granular bulk material is fed into each of the sections of the cellular wheel from the outer ring of the moving object and substantially rotated once. Later, each of the sections of the object moving around the axis of rotation may be removed via the outer ring. During the operation of the moving object, it is possible both to feed the bulk material from the outer periphery and to send in air entering from the outside from the outside of the moving object. In an advantageous manner, steam and gas streams entering through the outer surface can be removed from the individual sections via lines formed in the hub of the cellular wheel. The water vapor stream introduced from the outer peripheral surface of the cellular rotary disc is condensed and discharged at the hub of the cellular rotary disc through the cell, and can be collected together with its contents, and the discharge therefrom runs coaxially with respect to the rotation axis It can be removed from the vane-type cellular turntable via a line.
[0009]
In a method for facilitating the process of emptying individual sections of a cellular rotary disk rotating about a rotation axis in a vertical configuration, a gas flow, e.g., a nitrogen flow, is rotated by a cellular rotary disk rotating about a rotation axis in a vertical configuration. Can be introduced from the hub. In an inert gas supply line running coaxially with respect to the axis of rotation of the cellular wheel, nitrogen flows out of the hub of the cellular wheel rotating around the axis of rotation into individual sections and flows through the bulk material present there. As a result of the direction selection of the flow through and from inside to outside, it assists in the discharge of the product from the product discharge points of the individual compartmental chambers of the cellular wheel. After completely emptying the individual compartment cells on the cellular wheel, the wheel is rotated, for example, clockwise, in the product feed direction, so that each passes through the product feed (tube). The cell can be refilled with the product to be processed.
[0010]
In order to ensure that the powdery or granular solid material is fed to the individual sections of the cellular wheel, which moves around a horizontally oriented axis of rotation, the bulk material feed is applied to such a cellular rotary machine. Perform on the outer periphery of the board. According to one possible variant of the method of the invention, the moving object is also operated in a horizontal arrangement, so that the bulk material, which is respectively held in sections, is rotated about the axis of rotation of the object. Can be exposed to a gas flow parallel to. In the case of a cellular rotary feeder designed in this way and operated horizontally, the gas enters the bulky packing from above and flows downward. When this occurs, it is advantageously possible to separate the water by the law of gravity. In the case of moving objects operated in a horizontal arrangement, when individual sections are filled with bulk material, fixedly arranged lines are provided not only for bulk material, but also for steam, or especially gas or inert gas. And a fixed removal line is provided. Individual sections formed on a moving rotating object designed as a cellular wheel (for example as a vane-type cellular wheel) may be provided with an alternating and continuous covering surface. The coating surface can be arbitrarily provided. Alternating continuation of the coating surface may be, for example, as an inlet or outlet for bulk material, a coating surface without gas channels arranged in sections in an alternating arrangement and a section surface allowing gas flow (eg, a perforated section surface). ) Is selected differently on the bottom and on the cover of a cellular turntable operated in a horizontal configuration. When using a vane-type cellular rotary disc as a moving object, the partitioning of the wall forms a section designed in the form of several pieces of pie separated from each other.
[0011]
In an advantageous refinement of the method according to the invention, the solid material is treated in a moving (possible) object, which is subdivided into individual cells by means of partition walls, as a cellular wheel, whereby the remaining oxygen is further treated. It is possible without problems to remain in the solid substance without distribution to the solid material. In this variant, drying can be preferentially facilitated by exhaling air, so that a single air access on a cellular wheel, which moves about a rotation axis (in a horizontal arrangement), is sufficient.
[0012]
On the other hand, when processing polymers, for example in the formulation of polyethylene (in which case the content of residual oxygen is often a problem and further processing destroys enormous amounts), the classification of moving objects designed as cellular rotating wheels Conditioning of the bulk material contained in is carried out by means of steam for heating it and then the material is inertized with an inert gas. To facilitate gas flow while keeping the bulk material segmented, the exit surface and possibly the access surface are formed as a perforated grid arrangement.
[0013]
As a result, the method of the present invention can be used both in the case of no residual oxygen content and in the case of certain solid substances, and the residual oxygen content is reduced in the residual oxygen content in the solid substance. The same applies to critical powdered or granular solid materials. To this end, it allows for the number of air or inert gas inlets or outlets on the cellular wheel, which may be provided as embodiments of moving objects.
[0014]
According to the invention, an object is to provide an apparatus for heat-treating a powdery or granular solid substance in a gas stream, using an object which moves around a rotation axis and has a plurality of individual sections. So,
Covering which introduces or leaves the bulk material or gas stream is also achieved by means of the cover and bottom of the moving (possible) object provided in sections.
[0015]
The rotary device with the external drive allows individual setting and operation of the product throughput according to the requirements of the device, for example to feed raw materials to the extruder. The moving device is designed to rotate about an axis of rotation, in either a vertical or horizontal configuration, and the device may be designed as a cellular wheel, and the hub of the cellular wheel is It has a discharge line for steam condensate and gas and a supply line for gas, which can help to empty individual sections around the cellular wheel, which serves as a moving object.
[0016]
The present invention will be described below with reference to the drawings.
[0017]
FIG. 1 shows a side view of a moving object operated in a vertical arrangement with a product feed and a product discharge and a gas feed through the outer peripheral surface.
[0018]
FIG. 1a shows a vane-type cellular turntable.
[0019]
FIG. 2 shows a perspective view of an arrangement of a cellular turntable with a distribution filling chute.
[0020]
FIG. 3 shows a schematic illustration of a cellular rotating disk operated in a horizontal arrangement rotating around a rotation axis, with fixed locations of bulk material inlet and outlet and steam or inert gas supply lines. Show.
[0021]
FIG. 4 shows the form of the cover of the cellular turntable for preferential drying with air and then passivation.
[0022]
FIG. 5 shows the bottom morphology of the air-dried moving object of FIG. 4 with a perforated surface allowing gas flow and covering the section.
[0023]
FIG. 6 shows a form of the cover of a cellular turntable that acts as a moving object to heat and optionally passivate the product.
[0024]
FIG. 7 shows the form of the bottom surface portion of the cellular rotary disk in the form of the bottom surface in FIG.
[0025]
The display shown in FIG. 1 more closely depicts a side view of a cellular turntable operated in a vertical orientation.
[0026]
FIG. 1 shows a cellular turntable 2 that rotates around a rotation axis 1, for example, rotates in a clockwise direction 26 around the rotation axis 1.
[0027]
The cellular turntable 2 is further divided into individual sections 3 of the cellular turntable, each of which is formed by a section wall 6 extending from the hub of the cellular turntable 2. The segment arc of the segment is represented, for example, by the symbol 3.1. In this embodiment, the filling and removal (emptying) of the individual sections 3 takes place via the outer circumference, on the outer circumference of which both the bulk material supply path 4 and the bulk material discharge path 5 are provided. Shown schematically along the steam inlet 16. The filling of the individual sections 3 of the cellular wheel 2 takes place via the above-mentioned feed and discharge positions, so that the generation of steam condensate or the air-exhaust line is switched in the area of the cellular wheel 1 May be provided coaxially.
[0028]
The bulk material is fed, for example, to the individual sections 3 of the cellular rotating disk 2 via the bulk material supply path 4, and the inert gas flow generated radially outward from the inside is It can be produced in each section 3 of the cellular wheel 2 via a feed line for inert gas, which likewise runs coaxially in the region with respect to the rotating shaft 1. In an advantageous manner, the outward direction in the radial direction of the inert gas stream is such that the section arc 3.1 of section 3 containing the treated bulk material is immediately before or during the time when the section arc 3.1 is opposite the product discharge channel 5. Can be set. At this point, the operation of emptying each section 3 of the treated bulk material is facilitated by generating an inert gas flow from inside to outside, which ensures that this section is completely empty. obtain. While rotating the rotating wheel 2 further in the clockwise direction around the rotating shaft 1, the untreated bulk material is transferred to the divided cells of the rotating body 2 thus emptied through the loose material supply path 4. And feeds into the empty cell 3 via section arc 3.1.
[0029]
When the bulk material is fed through the bulk material supply path 4, the filling with air or inert gas 23, 24 is performed via the outer ring in each section 3 including the bulk material, and the opening is formed in the section arc. It can be treated by passing through a steam inlet 16 that extends to one section. Stream 16 or condensation occurrence is directed through the above-mentioned outlet (outflow) line, which runs coaxially with respect to the axis of rotation 1. An optional air supply 23 is provided outside the cellular wheel 2 via the outer surface (section arc 3.1) of each section 3 of the cellular wheel 2. The air flow from the outside to the inside, which dries the bulk material contained in the individual sections 3, can likewise be derived from the individual sections 3 via a discharge line provided in the hub area of the cellular wheel.
[0030]
In contrast, the inert gas stream 9 in the direction through the individual cells 3 containing the bulk material is treated, i.e. the heated, dried bulk material is placed as described above, whereby the bulk material is discharged. Complete emptying of the individual sections 3 of the cellular wheel 2 opposite the path 5 can be achieved by means of an inert gas stream 9 running from inside to outside via section 3.
[0031]
FIG. 1a shows a schematic view of a vane-type cellular rotary disc.
[0032]
A vane-type cellular turntable 2 rotatable about a rotation axis 1 and preferably used as a moving object rotates with respect to a boundary surface (not shown). When mounted in a vertical arrangement 28, it rotates with respect to two bounding surfaces arranged and fixed on both sides; in a horizontal arrangement 29, it rotates with respect to the bottom and cover surfaces. The upper cover (cover) is provided with a vane-type cellular rotary disc in the horizontal arrangement shown in FIG. 1a, but this is not absolutely necessary. The individual sections 3 opening in the region of the section arc 3.1 are separated from one another by a plurality of section walls 6. In the embodiment shown in FIGS. 1 and 1a, the direction of rotation of the vane-type cellular turntable 2 used as a moving object corresponds to the clockwise direction; however, by adopting a suitable access and exit surface, the direction of rotation is reversed. You can also
[0033]
FIG. 2 reproduced as a perspective view shows the cellular rotary disc 2 rotatable around the rotation axis and filling the bulk material through the outer periphery with the bulk material supply device 10 reproduced in the perspective view more finely. Things. Although not shown here, there is a bulk material storage above the bulk material chute for continuously supplying bulk material with the bulk material supply device 10. The opening of the chute of loose material can be adapted in an advantageous manner to the curvature of the outer peripheral surface of the cellular wheel serving as rotating body 3, and section 3 of cellular wheel 2 to be filled or to be filled. Just above the segmented arc 3.1 of FIG. On the other hand, this opening may pass over the entire section arc 3.1 between two adjacent section walls 6.
[0034]
The point of removal of the bulk material (not shown here in detail) is indicated by the reference numeral 5 (reference, indication in FIG. 1).
[0035]
In the vertical arrangement 28 of the cellular turntable 2 serving as a moving object, the bulk material outlet 5 is provided on the lower side, with the inert gas stream 9 traveling radially from the inside to the outside through the individual sections 3. Preferably, the law of gravity ensures that the individual product-containing cells 3 of the cellular wheel 2 are emptied.
[0036]
The representative example shown in FIG. 3 shows the cellular rotary disk 2 operated in a horizontal orientation more finely in a perspective view arrangement. An object designed as a cellular turntable 2 and rotating in a clockwise direction 26 about the axis of rotation 1 comprises individual sections 3 separated from one another by section walls 6 extending in a star shape via a hub. I have. The height of the individual sections 3 of the cellular wheel 2 is indicated by the reference numeral 18. The cover system of the cellular turntable 2 (this cover system is not shown here in detail, but will be explained more fully below) is at the top of FIG. 3 and can be optionally provided in a horizontal arrangement 29. In particular, perforated sections for gas access are optionally provided in this case. On the lower side, there is a bottom area of the cellular wheel 2 which is not shown in detail in FIG. 3 but is more accurately depicted in FIGS. The supply path for the bulk material traveling parallel to the rotation axis 1 according to the representative example of FIG. In this position, the powdery or granular material to be treated is introduced into the individual sections 3 of the cellular wheel 2. According to the representative example of FIG. 3, a cellular turntable 2 is provided, from which the discharge of the product indicated by reference 17 takes place and is sent to a further processing unit (not shown here; eg an extruder). The section 3 of the cellular wheel 2 just filled with the powdery or granular material to be processed rotates in a clockwise direction around a vertically oriented axis of rotation 1 according to the example of FIG. The bulk material contained in each of the section cells 3 is heated by the steam supply and sent to the corresponding section 3 provided in a fixed manner by reference numerals 16 and 22.
[0037]
After steam has been supplied to heat the bulk stock of bulk material supported in the corresponding section 6, drying takes place. A steam supply (path), an inert gas supply (path), and an optional air inlet can be fixedly provided above the cellular rotary disk 2. It is particularly preferred to introduce water vapor at the section surface formed like a pie piece. In the form of a moving object which is operated in a horizontal arrangement 29 in the form of a cellular wheel, the gas outflow takes place below the cellular wheel 2. For this reason, the bottom surface area of the cellular rotary disc 2 shown in FIG. 3 has a surface through which gas flows (details are not shown here).
[0038]
In the representative example shown in FIG. 4, the covering area of a moving (possible) object 2 designed as a cellular wheel and drying a substantially powdery or granular substance with air is depicted in more detail.
[0039]
Any cellular turntable cover supported by reference numeral 19 is further divided into individual sections 3 by section walls 6 according to the representative example of FIG. The feed of the product to be carried out to section 3 is indicated by the reference numeral 4, while the adjacent section 3 seen in the clockwise direction 26 is closed by the fixed covering 21. Section 3, seen as a white area in FIG. 4, represents section 3 of cellular turntable 2 mounted in a vertical arrangement and moving in a clockwise direction 26 about axis of rotation 1.
[0040]
Thus, solid material can enter section 3 through the opening of section 3 exposed at 4. In section 3 along the clockwise direction, the bulk material does not undergo any treatment; in the close section 3 seen in the clockwise direction 26, a steam supply 22 takes place. The outer arc of section 3 is represented by reference numeral 3.1. Once the steam supply has taken place, ie heating the bulk material stock supported in each of the sections 3, the bulk material is fed to the air supply channel 23 and drying takes place.
[0041]
In FIG. 4, the cover area 19 of the cellular turntable 2 is manufactured and the inert gas supply paths are designed as fixedly arranged nitrogen lines 24 and are designated by the reference numeral 24.
[0042]
In the example shown here of the cover form 19 of the cellular turntable 2, the two adjacent sections 3 contain an inert gas (eg CO 2). ₂ ) Is open so that it can pass through. The white areas indicate the corresponding openings or gas-permeable plates.
[0043]
Depending on the nature of the powdery or granular bulk material, the heating requirements, the degree of moisture and the particle size, the supply of steam can be carried out in the majority of section 3 and the supply of air to aid the drying is individual. It can be performed in a plurality of sections 3.
[0044]
The inert gas feed 24, here the representative surface shown in FIG. 4, is placed adjacently in the lower region, here only two are shown, the surface of which is cellular It may extend to two or more sections 3 of the turntable 2.
[0045]
The representative example shown in FIG. 5 shows in more detail the bottom surface area of the cellular wheel 2 which is responsible for the drying of the solid material, mainly by the supply of air, and the residual oxygen still present in the solid material, It is possible to dry without adversely affecting the subsequent processing. The bulk material supported in section 3 undergoes a complete processing cycle during the rotation of the cellular turntable 2 in the clockwise direction of the rotating shaft 1 and leaves section 3 at this position. Is done. The discharge of the product from each section 3 is represented by reference numeral 17.
[0046]
Depending on the design of the cover form of the passage openings and the covering of the individual sections 3 supporting the bulk material, the bottom surface of the cellular turntable 2 serving as a moving object has both gas flow passages and solid plates 25. , Thereby preventing the passage of bulk material per section 3, while according to the representative example represented in FIG. 5, the individual sections 3 have a perforated bottom or a bottom arranged in a grid shape. . This bottom surface keeps the bulk material of the individual sections 3 separated from one another by the indicated section walls 6 of the cellular turntable 2 but allows easy passage of water vapor, inert gas and drying gas. . In this way, for example, humid air flows down the cellular wheel 2 parallel to the axis of rotation 1 and the water vapor condensate from the individual sections 3 and from the bulk material present in the individual sections 3 Can be kicked out. In section 3, which is closed by a solid bottom surface 25 in the form of a pie-shaped plate part, it is not possible for gas to flow downwards parallel to the rotation axis 1 of the cellular wheel 2. The dwell time of the bulk material to be conditioned is a function of the speed of the vane-type cellular wheel 2 around the axis of rotation 1. When the size of the cellular turntable 2 is given, the effect of heating or drying can vary depending on the volume of gas passing therethrough.
[0047]
In the representative examples shown in FIGS. 6 and 7, the morphology of a moving (possible) object for the treatment of a granular or powdery solid substance is shown. These solid materials must not contain, after processing, interfering oxygen residues which would adversely affect further processes. This may be a problem, for example, during the compounding of polyethylene, especially when the product is gassed with air resulting in a high oxygen content.
[0048]
4 and 5, in the form variants shown in FIGS. 6 and 7, a greater proportion of the plurality of sections 3 on the cellular turntable 2 is due to the inert gas of nitrogen. 6. No air supply takes place in the individual sections of the cover configuration 19 of FIG. 6, while receiving the inserts 24.1, 24.2, 24.3 and 24.4.
[0049]
Therefore, only the inert gas (eg, nitrogen) supplied in the four sections 3 around the cellular turntable 2 is responsible for drying. 4 because the separate supply of air in the form of the cover of FIG. 4 would further increase the essentially undesirable oxygen content of the granular or powdered solid material.
[0050]
Therefore, the bottom side according to the representative example of FIG. 4 of the cellular rotating disk 2 used in this way is also designed to be different from the representative example of the bottom area shown in FIG. In the case of the bottom area represented in FIG. 7, the bottom of each of the plurality of sections 3 is specially designed so that the bulk material is within them but the bulk material contained therein can be passivated. Designed to. A grid-shaped or wire-meshed bottom or perforated bottom allows, on the one hand, the retention of loose material in section 3 of the cellular turntable 2; Distribution has been achieved. The representative example of FIG. 7 shows that the individual bottom sections 27.1, 27.2, 27.3, 27.4, 27.5, 27.6, and 27.7 have rotation directions 26 (ie, clockwise). Indicates that they are located adjacent to each other. At 17, discharge of the product, i.e., an operation which takes place parallel to the axis of rotation 1 of the cellular wheel 2 and leaves the section 3 of the cellular wheel 2 is possible. In the cellular wheel 2 thus operated in a horizontal arrangement, oxygen introduces water vapor directly on the cover side 19 of the cellular wheel 2 and then removes the inert gas at multiple locations such that one is behind the other. By supplying, solid substances in granular or powder form can be removed very efficiently.
[0051]
Exclusion of oxygen is necessary, for example, to prevent maximum degradation. A low oxygen content in the feed stream and in the molten polymer results in a higher grade product, which can give a higher quality rating, for example with respect to the Yellowness Index.
[0052]
In the case of extrusion in which only the supplied material is contacted with oxygen (for example in the case of an air supply), for example, in addition to a significant improvement in the quality of the product, the process according to the invention has further advantages:
1.
A large amount of energy introduced into the product to be heat-treated can be saved in the extruder for the electrical energy to be supplied to the extruder. Since steam is readily available at the manufacturing site, the supply of energy to the extruder can be significantly reduced.
[0053]
2.
At the same product throughput in the extruder, less electrical energy is required to preheat the granular polymer; the mechanical load on the extruder is reduced. This is advantageous for the service life of the extruder and also for the maintenance cycle.
[0054]
3.
If the mechanical drive available to the extruder is constraining the planned throughput increase, the material throughput can be greatly increased.
[0055]
The process parameters obtained and the dimensions of the cellular wheel designed according to the invention are described in detail based on the examples:
100 kg of polyethylene is produced with a throughput of 6 tons per hour of mass of the polyethylene granules and a rotational speed of the cellular rotary disc of 1 revolution per minute, with a throughput of the cellular rotary disc per minute. Ten sections or chambers 3 were assumed per cellular turntable 3, i.e. each section held approximately 10 kg of polyethylene (i.e. a volume equivalent to 20 L). For this reason, the total capacity of the cellular turntable 2 must be designed as a capacity for 200 L of material.
[0056]
1.5m diameter (1.76m ² Assuming that the cellular rotary disk 2 has the same surface area as described above), the total height 18 of the cellular rotary disk 2 is about 11.3 cm.
[0057]
To heat polyethylene granules, or granulated or powdered bulk material to 20-100 ° C., requires 0.5 t of steam per hour, which is approximately 800 m / hour. ³ Is equivalent to From this, 13 m / min. ³ It can be seen that the processing amount can be obtained. This corresponds to a volumetric flow of 200 L of water vapor per second. At an assumed flow rate of steam of about 4.5 km / h, the average dwell time of the powdery or granular material in the steam stream was about 6 seconds.
[Brief description of the drawings]
FIG.
FIG. 1 shows a side view of a moving object operated in a vertical arrangement with a product feed and a product discharge, and a gas feed through the outer peripheral surface.
FIG. 1a
FIG. 1a shows a vane-type cellular turntable.
FIG. 2
FIG. 2 shows a perspective view of an arrangement of a cellular turntable with a distribution filling chute.
FIG. 3
FIG. 3 shows a schematic illustration of a cellular rotating disk operated in a horizontal arrangement rotating around a rotation axis, with fixed locations of bulk material inlet and outlet and steam or inert gas supply lines. Show.
FIG. 4
FIG. 4 shows the form of the cover of the cellular turntable for preferential drying with air and then passivation.
FIG. 5
FIG. 5 shows the configuration of the bottom surface of the air-dried moving object of FIG. 4 with a perforated surface allowing the flow of gas and covering the section.
FIG. 6
FIG. 6 shows a form of the cover of a cellular turntable that acts as a moving object to heat and optionally passivate the product.
FIG. 7
FIG. 7 shows a form of the bottom surface portion of the cellular rotary disk belonging to the form of the bottom surface in FIG.
[Explanation of symbols]
1 Rotary axis
2 Cellular turntable
3 Cellular turntable classification
3.1 Sectional arc
4 Bulk material supply path
5 Bulk material discharge path
6 division wall
7 Air inlet
Exit 8
9 Direction of inert gas flow
10 Bulk material supply chute
11 Bulk material storage
12 Bulk material outlet
13 Open area
14 Cellular turntable width
15 Range of exit opening
16 Steam inlet
17 Bulk material removal section
18 Cellular turntable height
19 Cellular turntable cover
20 Cellular turntable bottom
21 Closed Division
22 Steam supply
23 Air supply path
24 Inert gas supply
24.1, 24.2, 24.3, 24.4 Inert gas classification
25 boards
26 Direction of rotation
27 perforated section bottom
27.1, 27.2, 27.3, 27.4, 27.5, 27.6, 27.7 Gas outlet section
28 Vertical arrangement
29 Horizontal arrangement

Claims (19)

A method for heat-treating a powdery or granular solid substance with a gas flow (7, 16, 22, 23, 24) using an object (2) moving around a rotation axis (1), comprising: Steps:
Heating the bulk material supported by the plurality of sections (3) of the object (2) by exposing it to steam (22);
Supplying the heated bulk material with air (23) and / or inert gas (24) generated in one or more lower steps;
A method comprising continuously removing a dried or inactivated bulk material from a moving object (2). Method according to claim 1, wherein a plurality of sections (3) of a rotating moving object (2) operated in a vertical arrangement (28) are filled / emptied via the circumference of the object. The bulk material is fed from the outer ring of the moving object (2) to a plurality of sections (3), and the plurality of sections (3) are removed from the outer ring of the moving object (2) and emptied. The method described in. Method according to claim 1, characterized in that the inert gas (24) and / or water vapor (16, 22) laterally enter a plurality of sections (3) of the object (2) moving around the axis of rotation (1). 3. The method according to claim 2, wherein the introduction of water vapor and air (7) takes place at the outer periphery of the moving object (2). A method according to claim 5, wherein the water vapor, air and inert gas exit radially from the hub (8) of the moving object (2) after flowing through the sections (3). A method according to claim 2, wherein the plurality of sections (3) are exposed to gas in a radial direction from inside to outside. 3. The method according to claim 2, wherein the supply of the bulk material (10, 11, 12) is performed from the outer periphery of the object (2) for supplying to a plurality of sections (3) of the object (2). The plurality of sections (3) of the moving object (2) operated in the horizontal arrangement (29) are divided into gas flows (4, 16, 22, 22, 23 and 24) in parallel with the rotation axis (1) of the moving object (2). The method of claim 1, wherein the method is exposed to 10. The method according to claim 9, wherein the moving object (2) is provided with a surface (25) on the cover side (19) covering the plurality of sections (3) in an alternating sequence. The moving object (2) comprises a plurality of sections (3, 17) having an outlet for the treated bulk material and a coating surface (25) arranged per section, and also the surfaces (27) of the sections from which gas can escape. ) On the bottom side (20). The method according to claim 9, wherein the horizontal arrangement (29) of the moving object (2) assists in the elimination of moisture in a direction parallel to the axis of rotation (1). 10. The method according to claim 9, wherein the bulk material supported in the plurality of sections (3) is dried by air (7, 23) containing an acceptable residual oxygen content of the bulk material. 10. The method according to claim 9, wherein the oxygen-free bulk material is passivated by direct introduction of water vapor (22) and supply of an inert gas. The powdery or granular solid material is moved around a rotation axis (1) and a gas flow (7,16,22) using a cellular wheel (2) having a plurality of individual sections (3). , 23, 24) for heat treatment,
Coatings (21, 25, 27) for introducing or leaving bulk material or gas streams (22, 23, 24) are provided in sections on the cover (19) and the bottom (20) of the moving cellular turntable. Equipment. The moving object (2) is designed as a cellular turntable movable around the axis of rotation (1) and helps to empty the discharge line (8) and section (3) for steam condensate and air. 16. The apparatus according to claim 15, wherein the supply line for the inert gas is provided on a hub of the cellular rotary disk. A cover (19) that allows access to fixed gas and to bulk material is mounted on a cellular turntable (2) that rotates about a rotating axis (1) and removes bulk material (17). ) And a fixed cover (20) having a plurality of sections (27) allowing gas passage is mounted under a cellular turntable (2) that rotates about an axis of rotation (1). An apparatus according to claim 1. 16. The device according to claim 15, wherein a plurality of sections (3) of the moving object (2) are adapted to flow vertically. 16. The device according to claim 15, wherein the plurality of sections (3) of the moving object (2) are adapted to allow water vapor, air, inert or dry gas to flow from outside to inside or from inside to outside.