Rotary kiln preheating device

Abstract

The rotary kiln preheating device comprises a container, a cavity for containing a combustion improver is formed in the container, a heater is installed in the cavity, a flow channel communicated with the cavity is formed in the position, located above the cavity, in the container, and an upper end opening of the flow channel is communicated with an air inlet pipe of a rotary kiln combustor. The heater is installed at the position, corresponding to the cavity, of the inner wall of the container, a heat conduction piece is arranged between the heater and the cavity and is configured to be of a structure capable of separating the heater from the cavity, a groove is formed in the position, corresponding to the heater, of the surface of the container, and a cover plate is detachably installed at the position of the groove. One side, facing the heater, of the cover plate is provided with a heat preservation part. The preheating device has the advantages of improving preheating efficiency, reducing heat loss, being convenient to maintain and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of preheating devices, in particular to a rotary kiln preheating device. BACKGROUND

[0002] The rotary kiln is a common thermal equipment in cement, metallurgy and other industries, and the preheating process is crucial to the pyrolysis and combustion efficiency of the material in the kiln. Some rotary kilns in the prior art are provided with a preheater at the front end of the kiln body. The material is preheated before being sent into the kiln body for calcination, which can increase the calcination efficiency of the material, improve the calcination quality, and reduce energy consumption. Most of the existing preheaters are vertically arranged, which has large volume, high cost and large maintenance amount. Moreover, the material is in a stacked state in the preheater, the preheating is uneven, there are dead angles, and the heat loss is large.

[0003] Therefore, it is particularly important to develop a rotary kiln preheating device with reasonable structure, high heat energy utilization rate and easy maintenance. CONTENT OF THE UTILITY MODEL

[0004] The present application mainly aims at the above-mentioned problems existing in the prior art, and provides a rotary kiln preheating device.

[0005] The purpose of the present application is mainly achieved through the following scheme:

[0006] The rotary kiln preheating device comprises a container, a cavity for loading combustion-supporting agent is formed in the container, a heater is installed in the cavity, a flow channel communicating with the cavity is arranged above the cavity in the container, the upper end of the flow channel is connected with the air inlet pipe of the rotary kiln burner, the heater is installed on the inner wall of the container at a position corresponding to the cavity, a heat conducting member is arranged between the heater and the cavity, the heat conducting member is configured to separate the heater and the cavity, a groove is formed in the position of the container surface corresponding to the heater, a cover plate is detachably installed at the groove to form a structure that can communicate or isolate the heater with the outside, and a heat preservation component is arranged on the side of the cover plate facing the heater.

[0007] Preferably, the heater comprises a hollow metal sheath pipe arranged in a serpentine coil shape, electric heating wires uniformly distributed in the metal sheath pipe, and a terminal post electrically connected with an external power supply to supply power to the heater.

[0008] Preferably, a connecting part is arranged on the metal sheath pipe, the connecting part is connected with the heat conducting member to fix the metal sheath pipe on one side wall of the heat conducting member.

[0009] As preferred, the outer periphery of the cover plate extends outwardly with a splicing part, the outer periphery of the container surface groove is provided with a splicing groove, the splicing part is matched to be arranged in the splicing groove, and a through threaded hole is arranged at the splicing part, and a fastener is arranged in the threaded hole to connect the cover plate and the container.

[0010] As preferred, the heat preservation part comprises a vacuum interlayer arranged on the inner side of the cover plate, the vacuum interlayer is provided with a vacuumizing nozzle, and an air absorbent is arranged in the vacuum interlayer.

[0011] As preferred, the heat conduction part has a heat conduction shell recessed into the cavity, an inner cavity for accommodating the heater is formed between the cover plate and the heat conduction shell, and the outer frame of the heat conduction shell is fixedly connected with the inner wall of the container.

[0012] Compared with the prior art, the utility model has the beneficial technical effects that: the heater is arranged on the inner wall of the container and is completely contained in the combustion aid, the heat emitted by the heater can be fully utilized by the combustion aid, energy waste is reduced, the heater is arranged between the heat conduction part and the cover plate, is mounted on the heat conduction part through the connecting part, and the cover plate and the container are detachably connected, so that the cover plate and the heater are conveniently disassembled, repaired and replaced, in addition, the heat preservation part is arranged between the cover plate and the heater, specifically, the heat preservation part is heat insulated through a vacuum interlayer, heat emission of the cover plate outwardly is prevented, energy waste is further reduced, and utilization efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is an external three-dimensional structure schematic view of the utility model;

[0014] Figure 2 It is a front view cross-sectional structure schematic view of the utility model;

[0015] Figure 3 It is an external three-dimensional structure schematic view of the utility model; Figure 2 It is a structure enlarged schematic view of A in the utility model;

[0016] Figure 4 It is a top view cross-sectional structure schematic view of the utility model;

[0017] Figure 5 It is a structure enlarged schematic view of B in the utility model. Figure 4

[0018] Reference signs: 1, container; 2, cavity; 3, flow channel; 4, heat conduction part; 41, heat conduction shell; 5, cover plate; 6, splicing part; 7, fastener; 8, inner cavity; 9, metal sheath pipe; 10, connecting part; 11, vacuum interlayer; 12, vacuumizing nozzle; 13, air absorbent. DETAILED DESCRIPTION ​

[0019] The utility model discloses a technical scheme, rotary kiln preheating device, including a container 1, in part embodiment, container 1 can be set as the cylindrical as shown in the figure, form a cavity 2 of loading combustion improver in container 1 inside, install heater in combustion improver cavity 2, generally, cavity 2 should be set in the bottom of container 1, when heater heats combustion improver in cavity 2, make combustion improver evaporate and can flow upwards, it should be understood that, should be set up the hole of injecting combustion improver into cavity 2 or pipeline on container 1, since not the main feature of the utility model, and belong to the common knowledge of the person skilled in the art, therefore, do not repeat and draw here. Figures 1-5 The utility model discloses a technical scheme, rotary kiln preheating device, including a container 1, in part embodiment, container 1 can be set as the cylindrical as shown in the figure, form a cavity 2 of loading combustion improver in container 1 inside, install heater in combustion improver cavity 2, generally, cavity 2 should be set in the bottom of container 1, when heater heats combustion improver in cavity 2, make combustion improver evaporate and can flow upwards, it should be understood that, should be set up the hole of injecting combustion improver into cavity 2 or pipeline on container 1, since not the main feature of the utility model, and belong to the common knowledge of the person skilled in the art, therefore, do not repeat and draw here.

[0020] Embodiment:

[0021] As shown in the figure, the utility model discloses a technical scheme, rotary kiln preheating device, including a container 1, in part embodiment, container 1 can be set as the cylindrical as shown in the figure, form a cavity 2 of loading combustion improver in container 1 inside, install heater in combustion improver cavity 2, generally, cavity 2 should be set in the bottom of container 1, when heater heats combustion improver in cavity 2, make combustion improver evaporate and can flow upwards, it should be understood that, should be set up the hole of injecting combustion improver into cavity 2 or pipeline on container 1, since not the main feature of the utility model, and belong to the common knowledge of the person skilled in the art, therefore, do not repeat and draw here. Figures 1-5 As shown in the figure, the utility model discloses a technical scheme, rotary kiln preheating device, including a container 1, in part embodiment, container 1 can be set as the cylindrical as shown in the figure, form a cavity 2 of loading combustion improver in container 1 inside, install heater in combustion improver cavity 2, generally, cavity 2 should be set in the bottom of container 1, when heater heats combustion improver in cavity 2, make combustion improver evaporate and can flow upwards, it should be understood that, should be set up the hole of injecting combustion improver into cavity 2 or pipeline on container 1, since not the main feature of the utility model, and belong to the common knowledge of the person skilled in the art, therefore, do not repeat and draw here. Figure 1 As shown in the figure, the utility model discloses a technical scheme, rotary kiln preheating device, including a container 1, in part embodiment, container 1 can be set as the cylindrical as shown in the figure, form a cavity 2 of loading combustion improver in container 1 inside, install heater in combustion improver cavity 2, generally, cavity 2 should be set in the bottom of container 1, when heater heats combustion improver in cavity 2, make combustion improver evaporate and can flow upwards, it should be understood that, should be set up the hole of injecting combustion improver into cavity 2 or pipeline on container 1, since not the main feature of the utility model, and belong to the common knowledge of the person skilled in the art, therefore, do not repeat and draw here.

[0022] Specifically, the container 1 is provided with a flow channel 3 communicated with the cavity 2 above the cavity 2, as shown in the figure, Figure 2 In part embodiment, the flow channel 3 is set as a conical structure, which is more conducive to the upward flow of the evaporated gas along the flow channel 3 and avoids poor gas flow. The upper end of the flow channel 3 is communicated with an air inlet pipe of the rotary kiln burner. In the utility model, the air inlet pipe refers to the pipeline communicated with the rotary kiln burner in the prior art. The specific structure of the air inlet pipe and the rotary kiln burner is not shown in the drawings.

[0023] Specifically, as shown in the figure, Figure 2 The heater is installed on the inner wall of the container 1 at a position corresponding to the cavity 2. A heat-conducting member 4 is arranged between the heater and the cavity 2. The heat-conducting member 4 is configured to separate the heater and the cavity 2. A groove is formed on the surface of the container 1 at a position corresponding to the heater. A cover plate 5 is detachably installed at the groove to form a structure that can communicate or isolate the heater with the outside. The cover plate 5, the heater, the heat-conducting member 4, and the cavity 2 are arranged in sequence from outside to inside.

[0024] In some embodiments of the utility model, the heat conducting part 4 has a heat conducting shell 41 recessed into the cavity 2, the heat conducting shell 41 can be made of copper or aluminum or other metal material with good heat conductivity, so that the heat generated by the heater can be better dissipated into the cavity 2 through the heat conducting shell 41, the heat conducting shell 41 has at least four side walls perpendicular to the inner wall of the container 1, and a plate is arranged between the four side walls, forming an inner cavity 8 accommodating the heater between the cover plate 5 and the heat conducting shell 41, and the outer frame of the heat conducting shell 41 is fixedly connected with the inner wall of the container 1.

[0025] Specifically, the outer periphery of the cover plate 5 extends outwardly with a splicing part 6, the outer periphery of the surface groove body of the container 1 is provided with a splicing groove, the splicing part 6 is arranged in the splicing groove, and a through threaded hole is formed at the splicing part, and a fastener 7 is arranged in the threaded hole to connect the cover plate 5 and the container 1, wherein the fastener 7 can be a fastening bolt, in general, at least four fasteners should be arranged on one cover plate 5, and the four fasteners 7 are arranged at the four corners of the cover plate 5.

[0026] Specifically, the side of the cover plate 5 facing the heater is provided with a heat preservation part, the heater can be provided with a plurality of heaters, and the heaters are uniformly distributed around the cavity 2 according to the shape of the container 1, and further, the number of the heat conducting part 4, the cover plate 5 and the heat preservation part matched with the heater should be consistent with the number of the heater.

[0027] Specifically, the heat preservation part includes a vacuum interlayer 11 arranged on the inner side of the cover plate 5, the vacuum interlayer 11 is provided with a vacuum suction nozzle 12, and an air suction agent 13 is arranged in the vacuum interlayer 11, when the cover plate 5 is installed, the vacuum interlayer 11 can be connected with the vacuum suction nozzle 12 through a vacuum pump to extract the air in the vacuum interlayer 11, and the air suction agent 13 can also absorb the residual air to improve the vacuum degree and further improve the heat preservation effect, the setting position and shape of the air suction agent 13 can be set according to the actual situation, which is not limited here.

[0028] Specifically, the heater includes a hollow metal sheath pipe 9 arranged in a serpentine coil shape, and an electric heating wire uniformly distributed in the metal sheath pipe, and a terminal post electrically connected with an external power supply to supply power to the heater, since the electric heater is a prior art, those skilled in the art should know the specific structure and setting mode of the heater, and the wiring, therefore, it is not repeated here, it can be understood that the heater can also include a temperature control device to adjust the heating temperature.

[0029] Specifically, in some embodiments of the utility model, the metal sheath pipe 9 is provided with a connecting part 10, the connecting part 10 is connected with the heat conducting part 4, so as to fix the metal sheath pipe 9 on one side wall of the heat conducting part 4, it can be understood that the connecting part 10 has a ring-shaped part which can be matched with the surface shape of the metal sheath pipe 9, and a main rod vertically extending upwards and downwards, the ring-shaped part is arranged on the main rod, and the two ends of the main rod are fixed on the heat conducting part 4 through screws.

[0030] The rotary kiln preheating device provided by the utility model has the advantages of simple structure, convenient installation, convenient maintenance, high heat efficiency, high heat utilization rate, low energy consumption, low cost, and the like.

[0031] Assembly process: first, the heat conducting part 4 is installed on the inner wall of the container 1 at the position corresponding to the cavity 2, so as to ensure firm installation and good sealing between the heat conducting part 4 and the cavity 2. Then, the metal sheath pipe 9 with the connecting part 10 is connected and fixed with the heat conducting part 4 through the connecting part 10, so as to form a heater. Then, the cover plate 5 with the heat preservation part including the vacuum interlayer 11, the vacuumizing nozzle 12 and the getter 13 is aligned with the splicing groove of the surface groove body of the container 1 through the splicing part 6 on the outer periphery of the cover plate 5, and is inserted and fastened with the fastener 7, so as to complete the assembly of the whole device. After the assembly is completed, the vacuumizing operation can be performed on the vacuum interlayer 11 through the vacuumizing nozzle 12.

[0032] Operation process: when the device starts to operate, the external power supply supplies power for the heater through the terminal post, the electric heating wire generates heat, the heat is transmitted to the heat conducting part 4 through the metal sheath pipe 9, and then is transmitted to the combustion-supporting agent in the cavity 2 through the heat conducting part 4, so as to preheat the combustion-supporting agent. The preheated combustion-supporting agent enters the air inlet pipe of the rotary kiln burner through the flow channel 3, and participates in the combustion process. In the operation process, the heat preservation part effectively reduces the heat loss to the outside through the cover plate 5, and ensures the heat efficiency of the device.

[0033] Maintenance process: when the heater needs to be maintained, the fastener 7 is only needed to be disassembled, and the cover plate 5 is only needed to be removed, so that the heater can be conveniently inspected, repaired or replaced. After the repair is completed, the cover plate 5 is reinstalled and fastened, and the device can continue to operate normally.

[0034] The above are the preferred embodiments of the application, and do not limit the protection scope of the application, so that: all equivalent changes made according to the structure, shape and principle of the application should be covered in the protection scope of the application.

Claims

1. A rotary kiln preheating device, comprising a container (1), a cavity (2) for containing combustion-supporting agent is formed inside the container (1), a heater is installed in the cavity (2), a flow channel (3) is arranged above the cavity (2) in the container (1) and communicates with the cavity (2), and the upper end of the flow channel (3) communicates with the air inlet pipe of the rotary kiln burner, characterized in that: The heater is installed on the inner wall of the container (1) at a position corresponding to the cavity (2), a heat conducting member (4) is arranged between the heater and the cavity (2), the heat conducting member (4) is configured as a structure capable of separating the heater from the cavity (2), a groove is formed on the surface of the container (1) at a position corresponding to the heater, and a cover plate (5) is detachably installed at the groove to form a structure capable of connecting or isolating the heater from the outside, and a heat preservation component is arranged on the side of the cover plate (5) facing the heater. ​ 2. A rotary kiln preheating device according to claim 1, characterised in that: The heater comprises a hollow metal sheath pipe (9) arranged in a serpentine coil shape, electric heating wires uniformly distributed in the metal sheath pipe (9), and a terminal post electrically connected with an external power supply to supply power to the heater.

3. A rotary kiln preheating device according to claim 2, characterised in that: A connecting portion (10) is arranged on the metal sheath pipe (9) and connected with the heat conducting member (4) to fix the metal sheath pipe (9) on one side wall of the heat conducting member (4).

4. The rotary kiln preheating device of claim 1, wherein: An outer periphery of the cover plate (5) extends outwardly with a splicing portion (6), an outer periphery of the groove on the surface of the container (1) is provided with a splicing groove, the splicing portion (6) is arranged in the splicing groove, a through screw hole is formed at the splicing portion (6), and a fastener (7) is arranged in the screw hole to connect the cover plate (5) with the container (1).

5. The rotary kiln preheating device of claim 1, wherein: The heat preservation component comprises a vacuum interlayer (11) arranged on the inner side of the cover plate (5), the vacuum interlayer (11) is provided with a vacuum suction nozzle (12) and an air suction agent (13) arranged inside.

6. The rotary kiln preheating device of claim 1, wherein: The heat conducting member (4) has a heat conducting shell (41) recessed into the cavity (2), an inner cavity (8) for accommodating the heater is formed between the cover plate (5) and the heat conducting shell (41), and an outer frame of the heat conducting shell (41) is fixedly connected with the inner wall of the container (1).

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