Spray dryer and spray drying method

Abstract

A spray dryer, in particular for producing sprayed granules, for example for producing ceramic parts, comprising at least one EM wave generator, in particular a microwave generator (16), for heating a starting mixture to be dried.

Description

[0001] MEISSNER

[0002] PO Box 860624

[0003] 81633 Munich

[0004] DORST Technologies GmbH & Co. KG August 6, 2025 Mittenwalder Straße 61 M / DORS-085-PC PF / PO / eh 82431 Kochel am See

[0005] Spray dryers and spray drying processes

[0006] Description

[0007] The invention relates to a spray dryer, in particular for the production of spray granules and / or powders, for example for the production of ceramic parts, and to a corresponding spray drying process. Spray dryers for the production of spray granules or powders are known, for example, from DE 20 2017 105 197 Ul. The mixture to be dried is typically heated by hot air, which is generated, for example, by a burner.

[0008] The object of the invention is to propose a spray dryer, in particular for the production of spray granules, for example for the production of ceramic parts, in which drying is made possible in a simple and effective manner, in particular with regard to heating the material to be dried.

[0009] This problem is solved in particular by the features of claim 1.

[0010] In particular, the problem is solved by a spray dryer, especially for the production of spray granules and / or powders, for example for the production of ceramic parts; (hard) metal powders; detergents; cleaning agents; pharmaceutical substances; foodstuffs; medical ceramics; metals; and / or other substances or materials, comprising at least one MEISSNER BOLTE M / DORS-085-PC

[0011] 2

[0012] EM wave generator (electromagnetic wave generator or generator for generating electromagnetic waves), in particular microwave generator and / or infrared wave generator for heating a starting mixture to be dried (e.g. comprising or formed by a liquid solution and / or a suspension and / or a mixture of substances).

[0013] A key concept of the invention is to heat the starting mixture to be dried using an electromagnetic wave, in particular a microwave. The heating required for drying can thus be achieved with simple means and surprisingly efficiently. In particular, energy consumption is comparatively low.

[0014] The spray dryer preferably comprises a reactor, in particular a spray tower or reactor vessel, in which the initial mixture can be heated. Preferably, the at least one electromagnetic wave generator, in particular a microwave generator, is arranged on an outer wall of the reactor chamber.

[0015] At least two, at least three or at least four EM wave generators, in particular microwave generators, can be provided, especially on an outer circumference of the reactor chamber.

[0016] The EM wave generator(s), in particular microwave generator(s), are preferably configured such that the generated microwaves are distributed homogeneously in the reactor chamber (the reactor vessel).

[0017] The spray dryer preferably includes a cyclone and / or filter downstream of the reactor for the treatment of exhaust air.

[0018] Preferably, the spray dryer comprises at least one atomizing nozzle (e.g., pressure nozzle and / or two-fluid nozzle) and / or at least one disc atomizer.

[0019] Atomization can occur with or against an airflow.

[0020] In a preferred embodiment, the spray dryer comprises at least one vacuum generation device for generating a vacuum in the MEISSNER BOLTE M / DORS-085-PC

[0021] 3

[0022] Reactor chamber. This promotes evaporation and ensures that dried material (dust) is safely retained inside the system.

[0023] Preferably, the reactor chamber comprises a (particularly upper) cylindrical section and / or a (preferably lower) conical and / or frustoconical section. The at least one EM wave generator (or generator for electromagnetic waves), in particular a microwave generator, is preferably arranged on the cylindrical section, but can also be arranged at another location.

[0024] The cylindrical section can have a (geometric) end face of the following shape: oval, preferably ellipse, in particular circle, or polygon, in particular quadrilateral, pentagon, hexagon or octagon. With a rectangular shape, it is particularly easy to use an EM wave generator with a flat radiating surface.

[0025] The above-mentioned task is further solved by using a spray dryer of the above type to produce spray granules, for example for the production of ceramic parts.

[0026] The aforementioned problem is further solved by a spray-drying process, in particular using the spray dryer described above, especially for the production of spray granules, for example for the manufacture of ceramic parts, wherein a starting mixture to be dried is heated by electromagnetic waves, for example microwaves (and / or infrared). Preferably, the process or the spray dryer is operated under reduced pressure.

[0027] The frequency of generated microwaves is preferably between 100 MHz and 1000 GHz, and more preferably between 300 MHz and 300 GHz. The frequency of generated infrared waves is preferably between 300 GHz and 400 THz, and more preferably between 10 THz and 100 THz.

[0028] Further embodiments are described in the dependent claims.

[0029] The invention is described below with reference to an exemplary embodiment, which is explained in more detail with reference to the figure. The figure shows: MEISSNER BOLTE M / DORS-085-PC

[0030] 4

[0031] Fig. 1 shows a schematic view of a spray dryer according to the invention.

[0032] In the following description, the same reference numbers are used for identical and equivalent parts.

[0033] Fig. 1 shows a spray dryer. This includes a pump 10 that conveys a starting mixture to be dried (e.g., a liquid solution, suspension, or mixture) through a line 11 into the interior of a spray drying unit 12. Atomization can be carried out with a suitable atomizing device 13, for example, comprising a pressure nozzle and / or a two-component nozzle and / or a disc atomizer. Atomization can be carried out with or against an airflow. A reactor chamber 14 can be supplied with fresh air via an intake port 15 (preferably comprising a pre-filter). Electromagnetic wave generators, in particular microwave generators, 16 can be arranged on the spray drying unit 12 and can distribute microwaves homogeneously in the reactor chamber 14.

[0034] The energy of the electromagnetic waves, for example microwaves, causes the water particles (and / or particles of another liquid) that are to be removed to vibrate. The liquid particles heat up, causing the water to evaporate.

[0035] The resulting steam can be carried away with the supplied fresh air. The exhaust air can be treated via a cyclone 20, optionally with a filter unit 17.

[0036] The resulting granules or powder can trickle into a cone 18 and can be discharged, for example, with a pendulum flap 19 (and / or a rotary valve).

[0037] The spray dryer can be operated under negative pressure to promote evaporation and to keep dust safely inside the system.

[0038] It should be noted at this point that all parts described above, considered individually and in any combination, especially those shown in the drawings - MEISSNER BOLTE M / DORS-085-PC

[0039] The details shown in Figure 5 are claimed to be essential to the invention. Modifications thereof are familiar to those skilled in the art.

[0040] Furthermore, it is noted that the broadest possible scope of protection is sought. Therefore, the disclosure contained in the claims can also be specified by features that are described by further features (even if these further features are not necessarily included). It is explicitly pointed out that parentheses and the term "in particular" are intended to emphasize the optionality of features in the respective context (which does not imply that a feature is to be considered mandatory in the corresponding context without such indication).

[0041] Bezuaszeichen

[0042] 10 pump

[0043] 11 Management

[0044] 12 Interior of a spray drying unit

[0045] 13 Spray drying unit

[0046] 14 Reactor chamber

[0047] 15 intake manifolds

[0048] 16 EM wave generator, in particular microwave generator

[0049] 17 Filter system

[0050] 18 cone

[0051] 19 Pendulum flap

[0052] 20 cyclone

Claims

PO Box 860624 81633 Munich DORST Technologies GmbH & Co. KG August 6, 2025 Mittenwalder Straße 61 M / DORS-085-PC PF / PO / eh 82431 Kochel am See Spray dryers and spray drying processes Claims 1. Spray dryer, in particular for the production of spray granules, for example for the production of ceramic parts, comprising at least one EM wave generator, in particular microwave generator (16), for heating a starting mixture to be dried.

2. Spray dryer according to claim 1, characterized by a reactor chamber (14), in particular a spray tower and / or reactor kettle, in which the initial mixture can be heated.

3. Spray dryer according to claim 1 or 2, which means that the at least one EM wave generator, in particular microwave generator, (16) is arranged on an outer wall of one / the reactor chamber (14).

4. Spray dryer according to one of the preceding claims, characterized by a cyclone and / or filter (17) downstream of a reactor chamber (14) for the treatment of exhaust air. MEISSNER BOLTE M / DORS-085-PC 2 5. Spray dryer according to one of the preceding claims, characterized by at least one atomizing nozzle and / or at least one disc atomizer.

6. Spray dryer according to one of the preceding claims, characterized by at least one vacuum generation device for generating a vacuum in one / the reactor chamber (14).

7. Spray dryer according to claim 1 or 2, which is characterized by the fact that a / the reactor chamber (14) has a cylindrical section and / or a conical or frustoconical section.

8. Use of a spray dryer according to one of the preceding claims for the production of spray granules, for example for the production of ceramic parts.

9. Spray drying method, in particular using the spray dryer according to one of the preceding claims, in particular for the production of spray granules, for example for the production of ceramic parts, wherein a starting mixture to be dried is heated by microwaves.

10. Spray drying method according to the immediately preceding claim, wherein the method or the spray dryer is operated under vacuum.

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