EP1763401B1 - Device and method for drying and deagglomerating - Google Patents

Abstract

The invention relates to a device and method for drying and deagglomerating moist feed material, whereby the feed material is kneaded, mixed and broken up by the action of at least one roller rolling on a driven plate and is dried by means of hot gas supplied thereto. The invention also relates to a method for converting this device into a mill drying device, whereby the at least one roll is provided with a pressing device.

Description

The invention relates to a method for drying and deagglomerating moist feed material and to a method for converting a device for drying and deagglomerating into a mill-drying device.

The JP-A-03127637 discloses a roller mill with grinding rollers and means for detaching and rupturing the grinding bed forming on the plate. Furthermore, from the DE-A1-195 35 613 a roller mill known, wherein one or more units, consisting of Mahl- Vorverdichter- and deagglomeration, are provided.

Wet processing is still commonly used in the processing of raw materials in the cement industry. Here, the raw material is wet ground and abandoned as sludge on long ovens. Another solution is to pre-dry the wet material by filter presses and place on rack mills and then further process in a two- or three-stage heat exchanger. Another option is to inject the sludge directly into a racket mill. The energy is generated here in a one- or two-stage heat exchanger to drive off the water.

The invention is based on the object to show a different way.

According to the invention, this object is solved by the features of claim 1.

In the method according to the invention for drying and deagglomerating a feed material having a moisture content of 15 to 50% is processed, which has at least 70%, a particle size of less than 200 microns and kneaded under the action of at least one rolling on a driven plate roll, mixed and digested and is dried by means of supplied hot gas, wherein the forming on the plate material bed is detached and broken.

The process for drying and deagglomerating is characterized by a very efficient treatment of the material.

Further embodiments of the invention are the subject of the dependent claims.

The apparatus required for the above drying and deagglomeration process consists essentially of a driven plate, at least one roll unit with a roll on the plate for kneading, mixing and digesting a feed material, means for supplying hot gas for drying the feed material and means for Detachment and breaking up of the bed of material forming on the plate.

The apparatus preferably comprises a stepped air supply in that first means for supplying hot gas in the region of the grinding plate and second means for supplying hot gas in a region above the at least one roller are provided.

With this device, a feed material with a humidity of 15 to 50% is easily processed. The feed material has to 70% to a particle size of less than 200 microns. Possibly. It is advantageous if already finished feed material for mixing with the still moist feed material is returned to the grinding table.

In addition to the efficient operation with moist feed material, the device described above has the further advantage that it can be converted in a corresponding embodiment at a later date in a simple manner in a grind-drying device. For this purpose, it is provided in particular that the roller is already designed as a grinding roller for later modification of the device. Also, the plate can already be configured as a grinding table. According to a further embodiment, a foundation for the device for drying and deagglomerating is further provided in such a way is designed so that it can be used for a later conversion of the device in a grind-drying device.

In the inventive method for operating and rebuilding a device for drying and deagglomerating with a driven plate, at least one roller unit with a rolling on the plate roller for kneading, mixing and digesting a feed material, means for supplying hot gas to dry the feed material and means for detachment and breaking up the bed of material forming the plate, the device is first operated according to the method described above and then converted into a grind-drying device, the roller (2a) being provided with a pressing device and the means for detaching and breaking up the plate forming on the plate Material bed to be removed

Optionally, further roller units are provided with pressing devices. Furthermore, it may be necessary for the plate drive and air supply device to be adapted to the conditions of a grind-drying device.

Further advantages and embodiments of the invention will be explained in more detail below with reference to the description of some embodiments.

Fig. 1a und 1b

eine schematische Seitenansicht und Aufsicht einer Vorrichtung zum Trocknen und Desagglomerieren gemäß einem ersten Ausführungsbeispiel,

Fig. 2a und 2b

eine schematische Seitenansicht und Aufsicht einer Vorrichtung zum Trocknen und Desagglomerieren gemäß einem zweiten Ausführungsbeispiel,

Fig. 3a und 3b

eine schematische Seitenansicht und Aufsicht einer Vorrichtung zum Trocknen und Desagglomerieren gemäß einem dritten Ausführungsbeispiel,

Fig.4

eine schematische Seitenansicht einer Vorrichtung zum Trocknen und Desagglomerieren gemäß einem vierten Ausführungsbeispiel,

Fig. 5

eine schematische Seitenansicht einer Vorrichtung zum Trocknen und Desagglomerieren gemäß einem fünften Ausführungsbeispiel,

Fig. 6 und 7

schematische Seitenansichten zweier Ausführungsbeispiele zum Zuführen des Aufgabematerials,

Fig. 8

eine schematische Ansicht einer Vorrichtung zum Trocknen und Desagglomerieren mit einem Sichter,

Fig. 9a

eine schematische Seitenansicht einer Vorrichtung zum Trocknen und Desagglomerieren vor dem Umbau in eine Mahltrocknungsvorrichtung,

Fig. 9b

eine schematische Seitenansicht einer Mahltrocknungsvorrichtung, die durch Umbau der Vorrichtung gemäß Fig. 9a entstanden ist,

Fig. 10

eine schematische Seitenansicht einer Mahltrocknungsvorrichtung, die durch einen Umbau der Vorrichtung gemäß Fig. 8 gebildet worden ist.

In the drawing show

Fig. 1a and 1b

a schematic side view and top view of an apparatus for drying and deagglomerating according to a first embodiment,

Fig. 2a and 2b

a schematic side view and top view of an apparatus for drying and deagglomerating according to a second embodiment,

Fig. 3a and 3b

a schematic side view and top view of an apparatus for drying and deagglomerating according to a third embodiment,

Figure 4

a schematic side view of an apparatus for drying and deagglomerating according to a fourth embodiment,

Fig. 5

1 is a schematic side view of a device for drying and deagglomerating according to a fifth embodiment,

6 and 7

schematic side views of two embodiments for feeding the feed material,

Fig. 8

a schematic view of an apparatus for drying and disagglomerating with a separator,

Fig. 9a

a schematic side view of an apparatus for drying and deagglomeration before conversion into a grinding drying device,

Fig. 9b

a schematic side view of a Mahltrocknungsvorrichtung, by rebuilding the device according to Fig. 9a originated,

Fig. 10

a schematic side view of a Mahltrocknungsvorrichtung, by a conversion of the device according to Fig. 8 has been formed.

In the Fig. 1a and 1b a device for drying and deagglomerating is shown, which essentially comprises a driven plate 1, a roller unit 2 with at least one rolling on the plate roller 2a for kneading, mixing and digesting a feed material, and means 3 for supplying hot gas 4 for drying the feed material having.

Furthermore, means 5 are provided for detaching and breaking up the material bed forming on the plate 1. These funds will be 5 in Embodiment according to Fig. 1a and 1b formed by a hammer roller 5a, which is optionally driven in opposite directions.

The plate 1 is supported on a foundation 7 and has a drive device, not shown, through which the plate can be driven about its vertical longitudinal axis 1 a. The reel unit 2 is supported on a foundation 8 and the means 5 are supported on a foundation 9. The roller 2a and the means 5 for detaching and rupturing the material bed forming on the plate are expediently arranged diagonally opposite one another, as is the case Fig. 1b is apparent. However, other rollers and / or means for detaching and breaking up the material bed forming on the plate can also be provided within the scope of the invention.

In the second embodiment according to Fig. 2a and 2b The means 5 for detaching and breaking up the material bed forming on the plate are formed by a tooth roller 5b. Another variant is in the Fig. 3a and 3b shown, in which the means are formed by a plow 5c, which can be attached directly to the housing 10 of the device.

In the embodiment according to Fig. 4 the means 5 are formed by a plow 5 c, which is not attached to the housing 10, but on the foundation 9. Instead of a plow, for example, a rake 5d according to Fig. 5 be considered.

According to Fig. 6 For example, the feed material can be fed directly onto the plate 1, for example in the area of the center, via a feed 11. Another or additional feeding point 12 may be provided in the upper region of the housing 10.

Furthermore, a stepped air supply can be provided by first means 3a for supplying hot gas 4 in the region of the grinding table 1 and second means 3b for Feeders of hot gas are provided in an area above the at least one roller 2a. The temperature of the hot gas in the region of the grinding plate is less than 650 ° C, preferably about 450 to 550 ° C. The upper air supply may operate at temperatures of at least 400 ° C, preferably in the range of 600 to 900 ° C.

Fig. 7 shows a variant in which the feed material is placed on a above the grinding table 1 arranged spreading plate 13. Expediently, hot air 4 'is also added in this area at the same time. The feed material is then thrown against the incoming air via the spreading disc 13 and the fine dried material is carried upwards with the gas flow and the coarse material falls down therefrom onto the grinding disc and is caught by the roller 2a.

In the Fig. 8 illustrated device for drying and deagglomerating has a sifter 14 formed in the upper region of the housing 10. The feed material supplied via the means 11 passes under the roll 2a and is thereby kneaded, mixed and digested. The falling over the edge of the plate 1 outwardly material is detected by the flowing from bottom to top of hot gas 4, wherein the material is carried upward and dried. Heavier particles immediately fall back onto the grinding table, while the other material passes into the sifter 14 arranged above.

The classifier, which is designed as a static or dynamic classifier, separates the material into fine material, which is led out with the gas flow upwards and coarse material, which is guided via a line 15 back to the plate 1. The fines pass together with the gas stream into a separator 16 which separates the gas from the fines. The hot gas 4 is discharged upward, while the finished product can be discharged via a line 17. It is possible to lead a portion of the finished good via a line 18 back to the plate 1, thereby adjusting the humidity of the material located on the plate can. With the device described above, it is possible to dry and deagglomerate relatively wet feed material having, for example, a humidity of 15 to 50%.

The feed material consists of 70 to 100% of a particle size of less than 200 microns. The roller 2a therefore does not have to perform essentially any grinding work. Therefore, no pressing device is required, since the weight of the roller 2a is sufficient for kneading, mixing and digesting the feed material. The contact pressure of the roller 2a is preferably in the range of 0 to 500 kN / m ² .

According to a particular embodiment of the invention, the above-described device for drying and deagglomerating is designed so that it can be rebuilt at a later time while maintaining some components in a grind-drying device.

According to a preferred embodiment of the invention, therefore, the role for later conversion of the device in a grind-drying device is already designed as a grinding roller. Also, the plate is designed for later conversion as Mahlteller. The foundations 7, 8 and 9 are expediently already designed so that they can be used in a subsequent conversion of the device in a grind-drying device on. For the reconstruction of in Fig. 9a shown apparatus for drying and deagglomeration in an in Fig. 9b shown grinding drying device is then essentially only one indicated by an arrow 19 pressing device required with which the roller 2a can be pressed onto the plate 1 formed as a grinding plate. The contact pressure of the roller 2a is usually in a range of 300 to 1000 kN / m ² .

If means 5 for detaching and rupturing the material bed forming on the plate were provided in the apparatus for drying and deagglomerating, they are removed or at least removed replaced another reel unit with pressing device. Preferably, up to four grinding rollers are provided on the plate 1.

Possibly. is also the drive device for the plate to adapt to the conditions in a grind-drying device.

Out Fig. 10 is the completely built grind-drying device to see. In this case, the part of the housing 10 above the roller units is modified so that a dynamic sifter 14 'can be provided there. Since the material discharge is done down, a bucket elevator 20 is still provided. When converting the device for drying and deagglomeration according to Fig. 8 in the in Fig. 10 Therefore, the foundations 7, 8 and 9 of the grinding table 1 and the roller unit 2 can be adopted.

The device for drying and deagglomeration described above is characterized by a very efficient operation. Furthermore, there is the possibility of a relatively inexpensive conversion to a grind-drying device.

Claims (4)

1. A method of drying and deagglomerating moist feed material, characterised in that a feed material with a moisture content of 15% to 50% is processed, wherein at least 70% of the feed material has a particle size of less than 200 µm, and is kneaded, mixed and broken up by the action of at least one roller (2) rolling on a driven plate (1) and is dried by means of supplied hot gas and wherein the material bed forming on the plate is detached and broken up.
2. A method according to claim 1, characterised in that some of the feed material which has already been dried is fed back to the grinding plate.
3. A method of operating and converting a drying and deagglomerating device having

   a. a driven plate (1),

   b. at least one roller unit (2) with a roller (2a) rolling on the plate for the purpose of kneading, mixing and breaking up a feed material;

   c. means (3) for supplying hot gas (4) for drying the feed material and

   d. means (5) for detaching and breaking up the material bed forming on the plate wherein the drying and deagglomerating device is operated in accordance with one or more of claims 1 to 2 and than is converted into a mill drying device, wherein the roller (2a) is provided with a pressing device and the means (5) for detaching and breaking up the material bed forming on the plate are removed.
4. A method according to claim 3, characterised in that further roller units (2) with pressing devices are installed.

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