Powder heating furnace

Abstract

The invention discloses a powder heating furnace, and belongs to the technical field of powder material production equipment. The powder heating furnace comprises a furnace body, a heating mechanism and a lifting mechanism. A mixing containing cavity is formed in the furnace body, and a feeding port is formed in the top or the upper portion of the furnace body. The heating mechanism is arranged on the furnace body, and indirectly heats materials in the mixing containing cavity by heating the furnace body; the lifting mechanism is arranged in the mixing containing cavity, annular flow channels are formed in the lifting mechanism and the inner wall of the furnace body, so that materials on the lower portion of the mixing containing cavity are lifted upwards through the lifting mechanism to be mixed with materials injected into the feeding port in a hedging mode, and the materials fall through the annular flow channels to be heated circularly. According to the powder heating furnace, powder can be evenly heated, and the uniformity of the temperature rise amplitude is improved.

Description

Technical Field

[0001] This application belongs to the technical field of powder material production equipment, and particularly relates to a powder heating furnace. Background Art

[0002] In the heating production of powder materials, a high-temperature fluidized bed is mostly used. By continuously introducing hot air, the powder is uniformly heated. However, in the production of powders such as sulfate powder, a large amount of sulfur-containing tail gas will appear, and tail gas treatment equipment and powder separation and purification equipment need to be configured, which increases the production configuration and operation and maintenance costs to a certain extent. Summary of the Invention

[0003] This application provides a powder heating furnace, aiming to at least solve to a certain extent the technical problems of generating a large amount of harmful tail gas during powder heating production and the high production line configuration and operation and maintenance costs. To this end,

[0004] A powder heating furnace provided by an embodiment of this application includes: a furnace body, a heating mechanism, and a lifting mechanism;

[0005] A mixing cavity is arranged inside the furnace body, and a feed inlet is opened at the top or upper part of the furnace body;

[0006] The heating mechanism is arranged on the furnace body and indirectly heats the materials in the mixing cavity by heating the furnace body;

[0007] The lifting mechanism is arranged inside the mixing cavity, and an annular flow channel is arranged between the lifting mechanism and the inner wall of the furnace body, so as to lift the materials at the lower part of the mixing cavity upward through the lifting mechanism, collide and mix with the materials injected from the feed inlet, and fall through the annular flow channel to implement cyclic heating.

[0008] In some embodiments, the heating mechanism includes an electromagnetic induction coil, and the electromagnetic induction coil is wound around the outside of the furnace body and has an isolation gap from the outer wall of the furnace body.

[0009] In some embodiments, a heat insulation material layer is arranged on the outside of the furnace body.

[0010] In some embodiments, the heat insulation material layer is arranged in the isolation gap, and the heat insulation material layer covers the heating range of the electromagnetic induction coil.

[0011] In some embodiments, the lifting mechanism includes a stirring shaft, a propeller blade, and a driving motor;

[0012] The propeller blade is rotatably arranged in the cylinder through the stirring shaft, and the driving motor is connected to the stirring shaft.

[0013] In some embodiments, the lifting mechanism includes: a cylinder body, a stirring shaft, propeller blades, and a driving motor;

[0014] The cylinder body is disposed in the furnace body, and an annular flow channel is formed between the cylinder body and the inner wall of the furnace body. The top port of the cylinder body is opposite to the feed port, and the bottom port of the cylinder body is located at the bottom of the mixing cavity;

[0015] The propeller blades are rotatably disposed in the cylinder body through the stirring shaft, and the driving motor is connected to the stirring shaft.

[0016] In some embodiments, a storage cavity is formed in the propeller blades to store a heat-conducting medium at a set temperature for heating the materials being lifted.

[0017] In some embodiments, heating coils are disposed in the stirring shaft to heat the stirring shaft and the propeller blades, thereby heating the materials being lifted.

[0018] In some embodiments, the powder heating furnace further includes a loosening mechanism disposed in the furnace body for loosening the materials accumulated at the bottom of the mixing cavity.

[0019] In some embodiments, the loosening mechanism includes: a blower and a loosening nozzle;

[0020] The loosening nozzle is disposed at the bottom or lower part of the furnace body and is connected to the blower to blow a high-pressure air beam into the mixing cavity to loosen the materials.

[0021] The embodiments of the present application at least have the following beneficial effects:

[0022] The powder heating furnace provided by the embodiments of the present application is provided with a heating mechanism on the furnace body to indirectly heat the materials in the mixing cavity by heating, and a lifting mechanism is disposed in the mixing cavity to form an annular flow channel in the mixing cavity, so as to lift the materials at the bottom of the mixing cavity to the upper part by the lifting mechanism and then fall through the annular flow channel, thereby circularly heating the materials, uniformly heating the materials, and uniformly increasing the temperature; on the other hand, the feed port can be disposed at the top or upper part of the furnace body and cooperate with the lifting mechanism to realize the impact of the newly injected materials and the lifted materials, so as to fully mix, preheat the newly injected materials, reduce the temperature difference between the mixed materials, and thus improve the temperature uniformity of the mixed materials as a whole and improve the production quality. On the other hand, since the materials are not directly heated by hot air, the waste gas volume can be greatly reduced and the environmental protection treatment cost can be reduced. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 It shows a schematic structural diagram of the powder heating furnace in the embodiments of the present application.

[0025] Reference numerals:

[0026] 1 - furnace body, 11 - furnace wall, 12 - feed inlet, 13 - discharge outlet, 14 - mixing cavity, 14a - annulus flow channel;

[0027] 2 - heating mechanism, 21 - electromagnetic induction coil;

[0028] 3 - heat insulation layer;

[0029] 4 - tail gas treatment device;

[0030] 5 - lifting mechanism, 51 - driving motor, 52 - stirring shaft, 53 - propeller blade, 54 - cylinder, 54a - top discharge port, 54b - bottom suction port;

[0031] 6 - loosening mechanism, 61 - loosening operation port, 62 - loosening nozzle. Detailed implementation manners

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0033] In addition, the present application may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0034] The following describes the present application with reference to the drawings and specific embodiments:

[0035] The production and processing of certain powdered materials requires a heating and fluidization process, usually using a fluidized bed. However, in actual production, materials that require high temperature control, such as sulfate powder, are prone to uneven heating and uneven temperature rise during the heating and fluidization process, which will produce a certain amount of sulfur-containing waste gas and increase the risk of environmental pollution. It is usually necessary to configure additional environmental protection measures such as exhaust gas treatment systems, which increases the operation and maintenance costs to a certain extent.

[0036] Therefore, the embodiment of the present application provides a powder heating furnace, which aims to improve the heating uniformity during the powder fluidization process to a certain extent, reduce by-products such as waste gas, and reduce operation and maintenance costs.

[0037] See also Figure 1 The powder heating furnace provided in the embodiment of the present application comprises: a furnace body 1, a heating mechanism 2 and a lifting mechanism 5. The heating mechanism 2 is arranged on the furnace body 1, and the lifting mechanism 5 is arranged in the furnace body 1.

[0038] The furnace body 1 is used as the main container for the heating and fluidizing operation, and a mixing chamber 14 is provided inside the furnace body 1 to carry the powder material and serve as the environment for the heating operation. Of course, a feed port 12 may be provided at the top or upper part of the furnace body 1, and a discharge port 13 may be provided at the bottom.

[0039] The heating mechanism 2 is an active heating mechanism with temperature regulation capability, and can directly or indirectly heat the powder material. The heating mechanism 2 can be arranged on the inner side or the outer side of the furnace body 1 .

[0040] The lifting mechanism 5 is arranged in the furnace body 1, specifically in the mixing chamber 14, and a certain distance is maintained between the lifting mechanism 5 and the furnace wall 11 of the furnace body 1 to form an annular control channel; thus, the powder material at the bottom of the mixing chamber 14 can be lifted upward to the upper area of ​​the mixing chamber 14 by the lifting mechanism 5, and then naturally falls through the annular channel 14a, and cyclic heating is achieved in this process. At the same time, in continuous production, the material lifted by the lifting mechanism 5 can be mixed with the feed from the feed port 12 to achieve preheating of the newly injected material, reduce the temperature difference with the cyclically heated material, thereby improving the uniformity of the overall material temperature to a certain extent and reducing the amount of waste gas generated due to uneven temperature.

[0041] In some embodiments, the heating mechanism 2 may adopt a structure based on the electromagnetic heating principle, that is, the heating mechanism 2 may include an electromagnetic induction coil 21, which may be wound around the outside of the furnace body 1. A part or all of the furnace body area of ​​the furnace body 1 is set to a matching metal material, and the furnace body of the partial metal material of the furnace body 1 is heated by electromagnetic induction, thereby contacting and heating the powder material.

[0042] It should be noted that there is a certain isolation gap between the furnace body 1 and the electromagnetic induction coil 21 to avoid direct contact, so as to ensure the insulation of the electromagnetic induction coil 21 and the overall safety of the overall heating mechanism 2 and the furnace body 1.

[0043] In some embodiments, the heating mechanism 2 can also adopt equipment with other structural forms, such as a coil heating device with a heat exchange medium inside. The temperature of the heat exchange medium is adjusted by a temperature control host, and the heat exchange medium is pumped to circulate in the coil. The coil is arranged in the furnace body 1 to achieve contact heat exchange.

[0044] In some embodiments, a heat preservation and insulation material layer 3 can also be arranged on the outer side of the furnace body 1 to improve the heat preservation performance of the furnace body 1 and isolate and protect the furnace body of the furnace body 1 to a certain extent, avoiding direct contact with the surrounding structure and causing heat radiation or scalding.

[0045] In some embodiments, the heat preservation and insulation material layer 3 can be arranged in the isolation gap, and the heat preservation and insulation material layer covers the heating range of the electromagnetic induction coil 21; that is, the heat preservation and insulation material layer 3 can be arranged between the furnace body 1 and the electromagnetic induction coil 21 to isolate and protect the furnace body at the covered position.

[0046] Generally speaking, the heat preservation and insulation material layer 3 can be selected as a heat insulation coating or a composite material layer composed of heat insulation materials, and is integrally coated on the furnace body of the furnace body 1.

[0047] In some embodiments, the furnace body 1 adopts a cylindrical tank-shaped part, and the heat preservation and insulation material layer 3 can be arranged on the outer peripheral surface of the cylindrical tank-shaped part, and the electromagnetic induction coil 21 is wound around the outer side of the outer peripheral surface of the heat preservation and insulation material layer 3.

[0048] In some embodiments, the lifting mechanism 5 can include a screw stirring lifter, which realizes the lifting and displacement of materials by using the screw lifting principle.

[0049] In some embodiments, the screw stirring lifter 5 can include: a driving motor 51, a stirring shaft 52, screw blades 53 and a cylinder body 54.

[0050] The cylinder body 54 can be arranged vertically in the furnace body 1 like the furnace body 1, and an annular flow channel 14a is formed between the cylinder body 54 and the inner wall of the furnace body 1. The top port 54a of the cylinder body 54 is opposite to the feed port 12, and the bottom port 54b of the cylinder body 54 is located at the bottom of the mixing cavity 14.

[0051] The screw blades 53 are rotatably arranged in the cylinder body 54 through the stirring shaft 52, and the driving motor 51 is connected to the stirring shaft 52.

[0052] Thus, the stirring shaft 52 and the propeller blades 53 can be driven to rotate by the driving motor 51, so as to suck materials from the bottom port 54b of the cylinder body 54, steadily lift them to the top port 54a, then discharge them from the top port 54a, and then fall naturally to achieve cyclic heating.

[0053] The driving motor 51 can be an electric motor or other torque output mechanisms, such as a speed reducer.

[0054] On the other hand, when injecting new materials, the new materials can be flushed and mixed with the materials discharged from the top port 54a, and a certain degree of preheating of the newly injected materials can be achieved, reducing the temperature difference and improving the temperature uniformity.

[0055] In some embodiments, in order to further improve the heating uniformity and efficiency, a heating structure can also be formed in the lifting mechanism 5 to cooperate with the heating mechanism 2 to heat the powder materials, so as to heat the materials during the entire cyclic flow process of the powder materials.

[0056] In some embodiments, a storage cavity can be opened in the propeller blade 53 to store a heat-conducting medium at a set temperature to heat the materials being lifted.

[0057] Generally, the temperature of the heat-conducting medium can be set according to the production requirements of the powder materials, and can be further adjusted and replaced as needed.

[0058] Certainly, the storage cavity can also be set as a circulation flow channel, connected to an external circulation pumping system, and a heat-conducting medium with a certain temperature flows in the propeller blade 53. Generally, a pipeline can be opened in the stirring shaft 52 and connected with a movable joint to ensure the liquid supply stability of the circulation pumping system.

[0059] In some embodiments, heating coils are arranged in the stirring shaft 52 to heat the stirring shaft 52 and the propeller blades 53, so as to heat the materials during the material lifting process.

[0060] In some embodiments, the propeller blade can be set as a double-layer structure, and gas circulation holes are opened thereon to blow the powder materials to prevent the materials from solidifying and affecting the fluidity.

[0061] The gas circulation holes can also be connected to an external heating fan, so as to blow out materials with a certain temperature to achieve a certain degree of heating or heat preservation.

[0062] In some embodiments, in order to improve the fluidity of the materials in the mixing cavity 14 in the furnace body 1 and reduce the risk of accumulation and compaction, the powder heating furnace can further include a loosening mechanism 6, and the loosening mechanism 6 can be arranged in the furnace body 1 to loosen the materials accumulated at the bottom of the mixing cavity 14.

[0063] Generally speaking, a loosening operation port 61 may be provided in the lower part or bottom area of ​​the furnace body 1, and an operating structure such as a shifting fork, a shifting shovel, etc. may be provided inside the loosening operation port 61 for shifting materials.

[0064] In some embodiments, the loosening mechanism may further include: a fan and a loosening nozzle 62; the loosening nozzle 62 may be arranged at the bottom or lower part of the furnace body 1, and together with the loosening nozzle 62, a high-pressure air beam may be sprayed into the mixing chamber 14 to loosen the material.

[0065] Of course, the fan can also be configured as a heating fan to blow out hot air at a certain temperature.

[0066] In some embodiments, the cylinder 54 may not be provided in the lifting mechanism 5, so that the propeller blades 53 serve as a turning structure, rotating with the stirring shaft 52 to turn the powder material, promote full mixing of new and old materials, expand the turning range, and improve heating uniformity.

[0067] The embodiments of the present application have at least the following beneficial effects:

[0068] The powder heating furnace provided in the embodiment of the present application has a heating mechanism arranged on the furnace body to heat the material in the mixing chamber, and a lifting mechanism is arranged in the mixing chamber to form an annular flow channel in the mixing chamber, so that the material at the bottom of the mixing chamber can be lifted to the upper part by the lifting mechanism, and then dropped through the annular flow channel, so as to circulate and heat the material, heat the material evenly, and increase the temperature at a uniform rate; on the other hand, the feed port can also be arranged at the top or upper part of the furnace body, and cooperate with the lifting mechanism to realize the offset of the newly injected material and the lifted material, so as to fully mix them, so as to preheat the newly injected material and reduce the temperature difference between the mixed materials, thereby improving the uniformity of the temperature of the mixed materials as a whole, reducing the amount of production waste gas caused by uneven temperature, and reducing the cost of environmental protection treatment.

[0069] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0070] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present application.

[0071] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If this specific posture changes, the directional indication will also change accordingly.

[0072] In the present application, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0073] In addition, in the present application, the descriptions such as "first" and "second" are only for descriptive purposes and should not be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise clearly and specifically defined.

[0074] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0075] In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0076] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A powder heating furnace, characterized in that, Comprising: A furnace body, a heating mechanism, and a lifting mechanism; A mixing cavity is provided inside the furnace body, and a feed inlet is opened at the top or upper part of the furnace body; The heating mechanism is arranged on the furnace body to indirectly heat the materials in the mixing cavity by heating the furnace body; The lifting mechanism is arranged in the mixing cavity, and an annular flow channel is provided between the lifting mechanism and the inner wall of the furnace body, so as to lift the materials at the lower part of the mixing cavity upward through the lifting mechanism, collide and mix with the materials injected from the feed inlet, and fall through the annular flow channel to implement cyclic heating.

2. The powder heating furnace according to claim 1, characterized in that, The heating mechanism includes an electromagnetic induction coil, and the electromagnetic induction coil is wound around the outside of the furnace body and has an isolation gap from the outer wall of the furnace body.

3. The powder heating furnace according to claim 2, characterized in that, A heat insulation material layer is provided on the outside of the furnace body.

4. The powder heating furnace according to claim 3, characterized in that, The heat insulation material layer is arranged in the isolation gap, and the heat insulation material layer covers the heating range of the electromagnetic induction coil.

5. The powder heating furnace according to claim 1, characterized in that, The lifting mechanism includes a stirring shaft, a propeller blade, and a driving motor; The propeller blade is rotatably arranged in the cylinder through the stirring shaft, and the driving motor is connected to the stirring shaft.

6. The powder heating furnace according to claim 1, characterized in that The lifting mechanism includes: a cylinder, a stirring shaft, a propeller blade, and a driving motor; The cylinder is arranged inside the furnace body, an annular flow channel is formed between the cylinder and the inner wall of the furnace body, the top port of the cylinder is opposite to the feed inlet, and the bottom port of the cylinder is located at the bottom of the mixing cavity; The propeller blade is rotatably arranged in the cylinder through the stirring shaft, and the driving motor is connected to the stirring shaft.

7. The powder heating furnace according to claim 5 or 6, characterized in that, A storage cavity is formed inside the propeller blade to store a heat-conducting medium at a set temperature for heating the materials being lifted.

8. The powder heating furnace according to claim 5 or 6, characterized in that, Heating coils are arranged inside the stirring shaft to heat the stirring shaft and the propeller blade, thereby heating the materials being lifted.

9. The powder heating furnace according to claim 1, characterized in that, The powder heating furnace further includes a loosening mechanism, and the loosening mechanism is arranged inside the furnace body to loosen the materials accumulated at the bottom of the mixing cavity.

10. The powder heating furnace according to claim 9, characterized in that, The loosening mechanism includes: a blower and a loosening nozzle; The loosening nozzle is arranged at the bottom or lower part of the furnace body and is connected to the blower to blow a high-pressure air beam into the mixing cavity, thereby loosening the materials.

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