Lepidolite clinker waste heat recovery system

Abstract

The present invention discloses a lithium mica clinker waste heat recovery and utilization system, which includes a two-stage heat exchange and conveying device; each heat exchange and conveying device includes a kiln shell and a heat exchange pipe arranged outside the kiln shell, the inside of the kiln shell is used to transport lithium mica clinker, and the two ends of the kiln shell have a feed port and a discharge port; the discharge port of the previous stage heat exchange and conveying device is connected to the feed port of the next stage heat exchange and conveying device; the lithium mica clinker waste heat recovery and utilization system also includes an airflow generating circuit, and the airflow generating circuit is connected to the inside of the kiln shell. The present invention radiates heat outward through the wall surface of the kiln shell, and the heat is absorbed by the medium of the heat exchange pipe and recycled; during the cooling process, the airflow generating circuit forms an airflow inside the kiln shell, so that the air temperature inside the kiln shell is more uniform, thereby improving the heat exchange efficiency. In addition, the lithium mica clinker transported from the second-stage heat exchange and conveying device is cooled, which is suitable for subsequent production and processing. Compared with water spray cooling, it reduces the thermal pollution caused to the environment.

Description

Technical Field

[0001] The invention relates to the technical field of lepidolite processing, and in particular to a lepidolite clinker waste heat recovery and utilization system. Background Art

[0002] Lepidolite, also known as "lepidolite", often contains rubidium, cesium, etc. It has a monoclinic crystal system and is often a fine scaly aggregate. It is light purple, sometimes yellow-green, and has a glassy luster. It is mainly found in pegmatite, but also in greisen and high-temperature hydrothermal veins. It is a mineral raw material for extracting lithium.

[0003] The process of extracting lithium from lepidolite usually requires calcination and carbonization to remove moisture from the lepidolite to form clinker. The clinker needs to be cooled before subsequent use. During this process, a large amount of heat is dissipated into the environment in the form of radiation heat dissipation, which not only causes a large amount of energy waste but also causes environmental pollution. Summary of the Invention

[0004] The main purpose of the present invention is to provide a lepidolite clinker waste heat recovery and utilization system, aiming to solve the problems of large amount of energy waste and environmental pollution caused by the lepidolite clinker transportation and cooling process.

[0005] To achieve the above-mentioned purpose, the present invention proposes a lithium mica clinker waste heat recovery and utilization system, which includes a two-stage heat exchange and transportation device; each of the heat exchange and transportation devices includes a kiln shell and a heat exchange pipe arranged outside the kiln shell, the kiln shell is used to transport lithium mica clinker, and the two ends of the kiln shell have a feed port and a discharge port connected to the interior of the kiln shell; the discharge port of the heat exchange and transportation device of the previous stage is connected to the feed port of the heat exchange and transportation device of the next stage; the water inlet of the heat exchange pipe is connected to a water inlet pipe, and the water outlet of the heat exchange pipe is connected to a water outlet pipe; the lithium mica clinker waste heat recovery and utilization system also includes an airflow generating circuit, which is connected to the interior of the kiln shell, and the airflow generating circuit is used to form an airflow inside the kiln shell.

[0006] In one embodiment, the lepidolite clinker waste heat recovery system further includes a steam generator, the water outlet pipe of the previous stage heat exchange and conveying device is connected to the steam generator, and the steam generator is provided with a steam outlet pipe.

[0007] In one embodiment, an air flow channel is provided on the inner wall of the kiln shell, a negative pressure hole is formed on the inner side of the air flow channel, and an end of the air flow channel is connected to an air flow generating circuit.

[0008] In one embodiment, the negative pressure holes are arranged at intervals along the axial direction of the kiln shell, and the apertures of the negative pressure holes are arranged to decrease gradually along the transportation direction of the lepidolite clinker.

[0009] In one embodiment, the heat exchange pipe is arranged in a spiral shape; or the heat exchange pipe has a plurality of branches, each branch extending along the axial direction of the kiln shell, and the plurality of branches are distributed at intervals along the outer circumference of the kiln shell.

[0010] In one embodiment, the lepidolite clinker waste heat recovery system further includes a stirring assembly, which is rotatably disposed in the kiln cylinder and is used to crush the lepidolite clinker in the kiln cylinder.

[0011] In one embodiment, the heat exchange pipe is coated with a heat insulation layer.

[0012] In one embodiment, the lepidolite clinker waste heat recovery system further includes a water supply circuit, which is connected to the water inlet and is serially provided with a water supply pump, a booster circulation pump and a one-way valve.

[0013] In one embodiment, the water inlet and the water outlet of the heat exchange pipe are respectively arranged at two ends of the kiln shell.

[0014] In the technical solution of the present invention, the lepidolite clinker waste heat recovery system utilizes a two-stage heat exchange and conveying device to perform secondary cooling of the lepidolite during transportation. This allows the lepidolite clinker discharged from the final discharge port to reach a preset temperature. Specifically, the lepidolite clinker radiates heat outward through the walls of the kiln shell, where it is absorbed by the medium in the heat exchange pipes and recycled. During the cooling process, an airflow generation circuit creates airflow within the kiln shell, making the internal air temperature more uniform and thus improving heat exchange efficiency.

[0015] No, when the lepidolite clinker passes through the first-stage heat exchange and conveying device, the water in the heat exchange pipe can be evaporated to form steam. By collecting the steam, it can be used in subsequent production and processing, thereby improving energy utilization and reducing the waste of raw materials and heat. When the lepidolite clinker passes through the second-stage heat exchange and conveying device, the water in the heat exchange pipe of the second-stage heat exchange and conveying device can be heated for production or domestic water, or even secondary heated to form steam, thereby shortening the heating time and saving energy. As a result, the lepidolite clinker transported from the second-stage heat exchange and conveying device is cooled and suitable for subsequent production and processing. Compared with water spray cooling, it reduces the thermal pollution caused to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0017] Figure 1 Schematic diagram of the structure of the lepidolite clinker waste heat recovery system in an embodiment of the present invention;

[0018] Figure 2 Schematic diagram of the internal structure of the kiln shell in an embodiment of the present invention.

[0019] Description of Figure Numbers:

[0020] 1. Heat exchange conveying device; 11. Kiln shell; 111. Feed inlet; 112. Discharge outlet; 12. Heat exchange pipe; 121. Water inlet pipe; 122. Water outlet pipe; 13. Thermal insulation layer;

[0021] 21. Air flow channel; 22. Negative pressure hole;

[0022] 3. Steam generator; 31. Steam outlet pipe;

[0023] 41. Stirring assembly;

[0024] 5. Water supply circuit; 51. Water supply pump; 52. Booster circulation pump; 53. One-way valve.

[0025] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referenced. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this disclosure, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0029] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0030] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] The present invention proposes a lepidolite clinker waste heat recovery and utilization system, aiming to solve the problems of large amount of energy waste and environmental pollution caused by the lepidolite clinker transportation and cooling process.

[0032] like Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the lithium mica clinker waste heat recovery and utilization system includes a two-stage heat exchange and transportation device 1; each heat exchange and transportation device 1 includes a kiln shell 11 and a heat exchange pipe 12 arranged outside the kiln shell 11, the kiln shell 11 is used to transport lithium mica clinker, and the two ends of the kiln shell 11 have a feed port 111 and a discharge port 112 connected to the interior of the kiln shell 11; the discharge port 112 of the previous stage heat exchange and transportation device 1 is connected to the feed port 111 of the next stage heat exchange and transportation device 1; the water inlet of the heat exchange pipe 12 is connected to the water inlet pipe 121, and the water outlet of the heat exchange pipe 12 is connected to the water outlet pipe 122; the lithium mica clinker waste heat recovery and utilization system also includes an airflow generating circuit, which is connected to the interior of the kiln shell 11, and the airflow generating circuit is used to form an airflow inside the kiln shell 11.

[0033] In this embodiment, the lepidolite clinker waste heat recovery and utilization system utilizes a two-stage heat exchange and conveying device 1 to perform secondary cooling on the lepidolite during the conveying process. This allows the lepidolite clinker output from the latter discharge port 112 to reach a preset temperature. Specifically, the lepidolite clinker radiates heat outward through the wall of the kiln barrel 11, and the heat is absorbed by the medium of the heat exchange pipe 12 and recycled. During the cooling process, the air flow generation circuit forms an air flow inside the kiln barrel 11, making the internal air temperature more uniform, thereby improving the heat exchange efficiency.

[0034] For ease of description, in this embodiment, the preceding heat exchange and conveying device 1 is defined as the first-stage heat exchange and conveying device 1, and the succeeding heat exchange and conveying device 1 is defined as the second-stage heat exchange and conveying device 1. The medium filled in the heat exchange pipe 12 can be water. The temperature of the lepidolite clinker when it leaves the kiln is above 200°C. Therefore, after passing through the first-stage heat exchange and conveying device 1, the water in the heat exchange pipe 12 can be evaporated to form steam. By collecting the steam, it can be used for subsequent production and processing, improving energy utilization and reducing the waste of raw materials and heat. After passing through the first-stage heat exchange and conveying device 1, the temperature of the lepidolite is between 80°C and 100°C. At this time, the water in the heat exchange pipe 12 of the second-stage heat exchange and conveying device 1 can be heated and used for production or domestic water. Even secondary heating to form steam can shorten the heating time and save energy. As a result, the lepidolite clinker transported from the second-stage heat exchange and conveying device 1 is cooled and suitable for subsequent production and processing. Compared with water spray cooling, it reduces the thermal pollution caused to the environment.

[0035] In other embodiments, according to the initial temperature of the clinker when it leaves the kiln, a three-stage, four-stage or even more-stage heat exchange and conveying device 1 may be provided, and the embodiments of this specification do not limit this.

[0036] In one embodiment, the lepidolite clinker waste heat recovery system further includes a steam generator 3. The water outlet pipe 122 of the previous-stage heat exchange and conveying device 1 is connected to the steam generator 3, which is provided with a steam outlet pipe 31. To ensure steam output, the water outlet pipe 122 of the first-stage heat exchange and conveying device 1 is connected to the steam generator 3. Even if the output still contains some liquid water, the liquid water is at a higher temperature and can quickly evaporate to form steam, thereby reducing the energy consumption of the steam generator 3.

[0037] Based on the above embodiment, a gas-liquid separator can be provided between the water outlet pipe 122 of the first-stage heat exchange and transportation device 1 and the steam generator 3. The steam and the steam discharged from the steam outlet pipe 31 of the steam generator 3 are combined and used for production and processing, and the liquid enters the steam generator 3 for reheating. The steam generator 3 can be electrically heated.

[0038] In one embodiment, an airflow channel 21 is provided on the inner wall of the kiln barrel 11. A negative pressure hole 22 is formed inside the airflow channel 21. The end of the airflow channel 21 is connected to an airflow generating circuit. Specifically, the inner wall of the kiln barrel 11 is provided with a pipe structure or a sandwich structure. The end of the airflow channel 21 is connected to the airflow generating circuit to generate a negative pressure at the negative pressure hole 22, thereby drawing hot air from the kiln barrel 11 into the airflow channel 21. The wall surface of the airflow channel 21 and the wall of the heat exchange pipe 12 directly contact and exchange heat, reducing the intermediate space and improving the heat exchange efficiency.

[0039] Moreover, the air generated by the airflow generating circuit after heat exchange has a certain amount of residual heat. The airflow generating circuit refills the heat-exchanged air into the kiln barrel 11 for secondary utilization, so that the air and the lepidolite clinker are heated quickly by heat exchange, thereby reducing energy waste.

[0040] In one embodiment, to maintain consistent negative pressure at all locations, negative pressure holes 22 are spaced apart axially along the kiln barrel 11, with the diameters of the negative pressure holes 22 decreasing along the transport direction of the lepidolite clinker. This allows air to circulate within the kiln barrel 11, effectively exchanging heat with the lepidolite clinker and rapidly cooling the lepidolite clinker.

[0041] In one embodiment, the heat exchange pipe 12 may be arranged in a spiral shape; in other embodiments, the heat exchange pipe 12 may have multiple branches, each extending axially along the kiln shell 11, with the multiple branches spaced apart along the outer circumference of the kiln shell 11. By rationally configuring the shape and arrangement of the heat exchange pipe 12, the length of the heat exchange pipe 12 outside the kiln shell 11 can be maximized, thereby ensuring sufficient heat exchange and improving heat exchange efficiency.

[0042] Specifically, heat exchange efficiency is related to parameters such as heat exchange area, heat exchange time, and temperature difference. This embodiment utilizes the aforementioned structural arrangement, such as a spiral structure that increases the path length, thereby increasing heat exchange time. Multiple branches spaced along the periphery of the kiln barrel 11 increase the heat exchange area. By creating airflow disturbances within the kiln barrel 11, the temperature inside the kiln barrel 11 is maintained at a higher level, thereby increasing the temperature difference. Consequently, the overall heat exchange efficiency is improved.

[0043] In one embodiment, the lepidolite clinker waste heat recovery system further includes a water supply circuit 5 , which is connected to the water inlet and is serially connected to a water supply pump 51 , a booster circulation pump 52 , and a check valve 53 . The water supply pump 51 provides pressure to draw water from an external source, while the booster circulation pump 52 compensates for leaks and maintains a constant circuit pressure. The check valve 53 ensures that the drawn water flows only into the heat exchange pipe 12 , preventing backflow of hot water.

[0044] In one embodiment, the water inlet and the water outlet of the heat exchange pipe 12 are respectively arranged at the two ends of the kiln shell 11. Specifically, the water inlet of the heat exchange pipe 12 is arranged on the same side as the discharge port 112 of the kiln shell 11, and the water outlet of the heat exchange pipe 12 is arranged on the same side as the feed port of the kiln shell 11, that is, the direction of water flow in the heat exchange pipe 12 is opposite to the conveying direction of the lepidolite clinker. The lepidolite clinker dissipates heat during transportation, that is, the temperature at the front feed port is high and the temperature at the discharge port 112 is low. The water in the heat exchange pipe 12 increases in temperature as it flows, and always maintains a sufficient temperature difference between the water in the heat exchange pipe 12 and the lepidolite clinker (internal air).

[0045] In other embodiments, the water inlet and the water outlet of the heat exchange pipe 12 may also be arranged at the same end of the kiln shell 11, and the embodiments of this specification do not limit this.

[0046] In one embodiment, the lepidolite clinker waste heat recovery system further includes a stirring assembly 41 rotatably disposed within the kiln barrel 11. This stirring assembly 41 is used to crush the lepidolite clinker within the kiln barrel 11. This stirring assembly 41 pulverizes the lepidolite clinker, thereby more rapidly releasing heat within the lepidolite clinker. This effectively integrates the crushing process into the transportation process, facilitating processing, streamlining the process, and improving efficiency.

[0047] Specifically, the stirring assembly 41 may include a motor and a stirring blade. The stirring blade is arranged along the central axis of the kiln barrel 11. The outer periphery of the stirring blade is formed into a spiral blade. The stirring blade is driven by the motor to rotate to achieve the crushing of the lepidolite clinker. The stirring assembly 41 may also be a spiral blade arranged on the inner wall of the kiln barrel 11. The kiln barrel 11 has an inner shell and an outer shell. The inner shell can rotate to drive the blade to crush the lepidolite clinker.

[0048] In order to prevent the lepidolite clinker powder from entering the air flow channel 21, a filter element needs to be provided at the negative pressure hole 22 to prevent the lepidolite from blocking the air flow channel 21. It should be noted that the negative pressure at the negative pressure hole 22 is relatively small, and only internal air flow disturbance is required.

[0049] Furthermore, the heat exchange pipe 12 is provided with a heat insulation layer 13. This reduces the outward radiation heat dissipation of the entire lepidolite clinker waste heat recovery and utilization system, and improves the heat utilization rate of the lepidolite clinker.

[0050] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A lepidolite clinker waste heat recovery system, characterized in that: The lepidolite clinker waste heat recovery and utilization system includes a two-stage heat exchange and transportation device; Each of the heat exchange and conveying devices includes a kiln shell and a heat exchange pipe arranged outside the kiln shell. The kiln shell is used to convey lepidolite clinker. Both ends of the kiln shell have a feed port and a discharge port connected to the interior of the kiln shell. The discharge port of the heat exchange and conveying device of the previous stage is connected to the feed port of the heat exchange and conveying device of the next stage. The water inlet of the heat exchange pipe is connected to a water inlet pipe, and the water outlet of the heat exchange pipe is connected to a water outlet pipe. The lepidolite clinker waste heat recovery and utilization system further includes an airflow generating circuit, the airflow generating circuit being in communication with the interior of the kiln cylinder, and the airflow generating circuit being used to generate airflow inside the kiln cylinder; An air flow channel is provided on the inner wall of the kiln cylinder, a negative pressure hole is formed on the inner side of the air flow channel, and an end of the air flow channel is connected to an air flow generating circuit.

2. The lepidolite clinker waste heat recovery system according to claim 1, wherein: The lepidolite clinker waste heat recovery and utilization system also includes a steam generator. The water outlet pipe of the previous stage heat exchange and transportation device is connected to the steam generator, and the steam generator is provided with a steam outlet pipe.

3. The lepidolite clinker waste heat recovery system according to claim 1, wherein: The negative pressure holes are arranged at intervals along the axial direction of the kiln shell, and the apertures of the negative pressure holes are arranged to decrease gradually along the transportation direction of the lepidolite clinker.

4. The lepidolite clinker waste heat recovery system according to claim 1, wherein: The heat exchange pipe is arranged in a spiral shape; or the heat exchange pipe has a plurality of branches, each of the branches extends along the axial direction of the kiln shell, and the plurality of branches are distributed at intervals along the outer circumference of the kiln shell.

5. The lepidolite clinker waste heat recovery system according to claim 1, wherein: The lepidolite clinker waste heat recovery system further includes a stirring assembly, which is rotatably disposed in the kiln cylinder and is used to crush the lepidolite clinker in the kiln cylinder.

6. The lepidolite clinker waste heat recovery system according to any one of claims 1 to 5, characterized in that: The heat exchange pipe outer shell is provided with a heat insulation layer.

7. The lepidolite clinker waste heat recovery system according to any one of claims 1 to 5, characterized in that: The lepidolite clinker waste heat recovery and utilization system further includes a water supply circuit, which is connected to the water inlet and is serially provided with a water supply pump, a booster circulation pump and a one-way valve.

8. The lepidolite clinker waste heat recovery system according to any one of claims 1 to 5, characterized in that: The water inlet and the water outlet of the heat exchange pipe are respectively arranged at the two ends of the kiln shell.

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