Waste heat recovery device for a calcination kiln

Abstract

The utility model discloses a kind of waste heat recovery devices of calcining kiln, including bottom plate, the top of the bottom plate is successively installed with support frame, circulating fan and waste heat recovery assembly from left to right, the inner wall of the support frame is installed with cyclone separator, the bottom of the cyclone separator is installed with dust collecting barrel, the waste heat recovery assembly includes box, the outer wall front end of the box is installed with several even equidistant distribution water inlet valve, the outer wall rear end of the box is installed with several even equidistant distribution drain valve, the inside of the box is installed with heat exchange pipe, the utility model is through waste heat recovery assembly, when flue gas waste heat recovery, spiral heat exchange pipe cooperates multilayer water sump design, improve the residence time of flue gas and the contact area of flue gas and water in box, improve the efficiency of heat exchange, cooperate phase change material to absorb heat and store energy, improve the recycling rate of waste heat.

Description

Technical Field

[0001] This utility model mainly relates to the field of lithium battery cathode material calcination technology, specifically a waste heat recovery device for a calcination kiln. Background Technology

[0002] The calcination process of lithium battery cathode materials is an important step in the manufacturing of lithium battery cathode materials. It is usually used to synthesize and optimize the crystal structure of materials and improve their electrochemical performance. Calcination refers to heating the raw materials at high temperatures to promote chemical reactions, remove impurities, and adjust the physical and chemical properties of the substances. A calcination kiln is required when calcining lithium battery cathode materials. During the use of the calcination kiln, a large amount of high-temperature flue gas is generated. In order to recover and utilize the waste heat in the flue gas, a waste heat recovery device for the calcination kiln is needed.

[0003] In the prior art, a waste heat recovery and utilization device for a calcining kiln is disclosed in the patent application document with application number 202323426402.1. The device introduces flue gas into the cavity of the recovery box through a gas collection pipe. The flue gas circulates in the cavity and heats the water storage chamber in the recovery box with waste heat. However, the device has the following problems: when the flue gas circulates at high speed in the cavity, its residence time is short, which easily leads to insufficient contact time with the water in the box. The heat carried by the flue gas is difficult to be fully transferred to the water, resulting in a low heat recovery efficiency. Utility Model Content

[0004] This utility model provides a solution that is significantly different from existing technologies, addressing the problem that existing technologies are too simplistic. It mainly provides a waste heat recovery device for calcining kilns to solve the problem of low waste heat recovery efficiency of flue gas mentioned in the background.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] A waste heat recovery device for a calcining kiln includes a base plate. From left to right, a support frame, a circulating fan, and a waste heat recovery assembly are installed on the top of the base plate. A cyclone separator is installed on the inner wall of the support frame, and a dust collection bin is installed at the bottom of the cyclone separator.

[0007] The waste heat recovery assembly includes a box, with several evenly distributed water inlet valves installed at the front end of the outer wall of the box, and several evenly distributed drain valves installed at the rear end of the outer wall of the box. A heat exchange tube is installed inside the box, and the heat exchange tube (404) is spiral-shaped, with several evenly distributed metal heat-conducting fins on the outer wall of the heat exchange tube (404).

[0008] More preferably, the cyclone separator is connected to a circulating fan via a first connecting pipe, and the circulating fan is connected to a heat exchange pipe via a second connecting pipe.

[0009] More preferably, the inner wall of the box is equipped with several partitions that are evenly and equidistantly distributed.

[0010] More preferably, the outer wall of the box has a cavity inside, and the cavity is filled with heat-insulating foam, and the box is equipped with several temperature sensors.

[0011] More preferably, the inner wall of the box is equipped with an installation cylinder, and the installation cylinder contains a phase change material.

[0012] More preferably, the heat exchange tube is provided with a plurality of uniformly and equidistantly distributed guide plates inside.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] This waste heat recovery device, through its waste heat recovery components, allows the flue gas entering the heat exchange tube to exchange heat with water in several small water tanks within the casing during waste heat recovery. The spiral heat exchange tube has a larger contact area with the water in the casing, and the metal heat-conducting fins further increase the outer wall area of ​​the heat exchange tube, thus making heat transfer more complete and improving heat exchange efficiency. At the same time, the phase change material inside the installation cylinder absorbs heat for energy storage, improving the recovery and utilization rate of waste heat. The multi-layer water tank design allows the flue gas and water to fully exchange heat at different levels, increasing the contact area and contact time between the flue gas and water, improving heat exchange efficiency, and enabling the water to more effectively absorb the waste heat in the flue gas. It also helps to achieve heat exchange at different temperature levels, making better use of the waste heat resources of the flue gas.

[0015] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is an enlarged structural schematic diagram of the waste heat recovery component of this utility model;

[0018] Figure 3 This is a fully enlarged cross-sectional structural diagram of the waste heat recovery component of this utility model;

[0019] Numbering on the map:

[0020] 1. Base plate; 2. Support frame; 3. Circulating fan; 4. Waste heat recovery assembly; 401. Housing; 402. Inlet valve; 403. Drain valve; 404. Heat exchange tube; 405. Partition plate; 406. Mounting cylinder; 5. Cyclone separator; 6. Dust collection bin; 7. First connecting pipe; 8. Second connecting pipe. Detailed Implementation

[0021] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the utility model more thorough and comprehensive.

[0022] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0023] Please refer to the appendix carefully. Figure 1-3 A waste heat recovery device for a calcining kiln includes a base plate 1. A support frame 2, a circulating fan 3 and a waste heat recovery assembly 4 are installed sequentially from left to right on the top of the base plate 1. A cyclone separator 5 is installed on the inner wall of the support frame 2, and a dust collection bin 6 is installed at the bottom of the cyclone separator 5.

[0024] The waste heat recovery assembly 4 includes a housing 401. Several water inlet valves 402 are evenly and equidistantly distributed at the front end of the outer wall of the housing 401. Several drain valves 403 are evenly and equidistantly distributed at the rear end of the outer wall of the housing 401. A heat exchange pipe 404 is installed inside the housing 401. Several guide plates are evenly and equidistantly distributed inside the heat exchange pipe 404 to ensure that the flue gas is evenly distributed inside the heat exchange pipe 404.

[0025] In this embodiment, as Figure 1 As shown, the cyclone separator 5 is connected to the circulating fan 3 through the first connecting pipe 7, and the circulating fan 3 is connected to the heat exchange tube 404 through the second connecting pipe 8. The circulating fan 3 can promptly draw out the relatively clean gas separated by the cyclone separator 5 through the first connecting pipe 7, and send it into the heat exchange tube 404 through the second connecting pipe 8, so that the high-temperature flue gas can flow smoothly.

[0026] In this embodiment, as Figure 3As shown, the inner wall of the housing 401 is equipped with several evenly spaced partitions 405; the partitions 405 can divide the housing 401 into several small water tanks, each of which has a corresponding inlet valve 402 and outlet valve 403. When high-temperature flue gas passes through the heat exchange tube 404, the contact area and contact time between the flue gas and water are increased, thereby improving the heat exchange efficiency and enabling the water to absorb the waste heat in the flue gas more effectively. At the same time, it also helps to achieve heat exchange at different temperature levels and better utilize the waste heat resources of the flue gas.

[0027] In this embodiment, as Figure 3 As shown, the outer wall of the box 401 has a cavity inside, and the cavity is filled with heat-insulating foam. The box 401 is also equipped with several temperature sensors. The heat-insulating foam in the cavity can keep the temperature warm. Each box 401 is divided into several small water tanks by several partitions 405, and each of them is equipped with a temperature sensor, which can sense the temperature inside the water tank and display the temperature on the display screen.

[0028] In this embodiment, as Figure 3 As shown, an installation cylinder 406 is installed on the inner wall of the housing 401, and a phase change material is provided inside the installation cylinder 406; a threaded cap is installed on the top of the installation cylinder 406, and a partition 405 is installed on the outer wall of the installation cylinder 406. The phase change material is microencapsulated paraffin, which can maintain the relative stability of the temperature inside the housing 401. When the waste heat input fluctuates, the phase change material buffers the temperature change through its own phase change process, avoiding large fluctuations in the water temperature inside the tank, which is conducive to the stable utilization of hot water in the future, and can improve the waste heat recovery and utilization rate and reduce energy waste.

[0029] In this embodiment, as Figure 3 As shown, the heat exchange tube 404 is spiral-shaped, and the outer wall of the heat exchange tube 404 is provided with several uniformly and equidistantly distributed metal heat-conducting fins; the spiral shape of the heat exchange tube 404 allows the heat exchange tube 404 to have more contact area with the water in the box 401, thereby making the heat transfer more efficient. The setting of the metal heat-conducting fins further increases the outer wall area of ​​the heat exchange tube 404, which can improve the efficiency of heat exchange.

[0030] The specific operating procedure of this utility model is as follows: The inlet of the cyclone separator 5 is connected to the exhaust port of the desulfurization and denitrification equipment used to treat the flue gas discharged from the calcining kiln via a pipeline. Water is injected into several small water tanks inside the housing 401 through several water inlet valves 402. Then, the circulating fan 3 is started. When the flue gas passes through the cyclone separator 5, the dust falls into the dust collection bin 6 at the bottom of the cyclone separator 5. Next, the flue gas enters the heat exchange pipe 404 through the first connecting pipe 7 and the second connecting pipe 8. The heat exchange pipe 404 then exchanges water from the several small water tanks inside the housing 401. The heating process utilizes metal heat-conducting fins to improve heat exchange efficiency. The phase change material inside the mounting cylinder 406 absorbs heat for energy storage, improving the recovery and utilization rate of waste heat. Then, the flue gas is discharged through the other end of the heat exchange pipe 404. Temperature sensors in several small water tanks sense the temperature. When the water temperature in the corresponding small water tank reaches a suitable temperature, water is discharged through the corresponding drain valve 403 and water is injected through the corresponding inlet valve 402. When the phase change material inside the mounting cylinder 406 is used for a long time, the threaded cover on the mounting cylinder 406 can be opened as needed to replace the phase change material.

[0031] The present invention has been described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A waste heat recovery device for a calcining kiln, comprising a bottom plate (1), characterized in that: The top of the base plate (1) is equipped with a support frame (2), a circulating fan (3) and a waste heat recovery assembly (4) from left to right. A cyclone separator (5) is installed on the inner wall of the support frame (2), and a dust collection bin (6) is installed at the bottom of the cyclone separator (5). The waste heat recovery assembly (4) includes a housing (401). The front end of the outer wall of the housing (401) is equipped with several water inlet valves (402) that are evenly and equidistantly distributed. The rear end of the outer wall of the housing (401) is equipped with several drain valves (403) that are evenly and equidistantly distributed. The interior of the housing (401) is equipped with a heat exchange tube (404). The heat exchange tube (404) is spiral-shaped, and the outer wall of the heat exchange tube (404) is provided with several metal heat-conducting fins that are evenly and equidistantly distributed.

2. The waste heat recovery device for a calcining kiln according to claim 1, characterized in that: The cyclone separator (5) is connected to the circulating fan (3) through the first connecting pipe (7), and the circulating fan (3) is connected to the heat exchange pipe (404) through the second connecting pipe (8).

3. The waste heat recovery device for a calcining kiln according to claim 2, characterized in that: The inner wall of the box (401) is equipped with several evenly spaced partitions (405).

4. The waste heat recovery device for a calcining kiln according to claim 1, characterized in that: The outer wall of the box (401) is provided with a cavity, and the cavity is provided with heat-insulating foam. The box (401) is also provided with several temperature sensors.

5. The waste heat recovery device for a calcining kiln according to claim 1, characterized in that: The inner wall of the housing (401) is fitted with an installation cylinder (406), and the installation cylinder (406) contains a phase change material.

6. The waste heat recovery device for a calcining kiln according to claim 1, characterized in that: The heat exchange tube (404) is provided with several uniformly and equidistantly distributed guide plates inside.

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