A heat extraction device with over-temperature protection function, a heat extraction system and a heat extraction method

Abstract

The application discloses a heat taking device with over-temperature protection function, a heat taking system and a heat taking method, which comprise a heat taking structure, a high-temperature-resistant outer layer, and a gas supply device. The heat taking structure is provided with a heat taking part for extending into a high-temperature kiln. The high-temperature-resistant outer layer is arranged outside the heat taking part and has a spacing with the heat taking part to form a cooling cavity. The gas supply device is used for conveying a cooling gas flow to the cooling cavity to form a cooling gas film on the outer wall of the heat taking part. The heat taking device with over-temperature protection function of the embodiment of the application contacts the material body through the high-temperature-resistant outer layer, the heat taking part of the heat taking structure is located inside the high-temperature-resistant outer layer, thereby the heat taking part is heated and absorbs energy in the form of radiation heat transfer, and the cooling gas flow is inputted into the cooling cavity between the heat taking part and the high-temperature-resistant outer layer through the gas supply device to form a cooling gas film on the outer wall of the heat taking part for protection, thereby the heat taking structure can be prevented from over-temperature.

Description

Technical Field

[0001] This invention relates to the field of heat extraction equipment technology, and in particular to a heat extraction device, heat extraction system and heat extraction method with over-temperature protection function. Background Technology

[0002] In industries such as carbon, graphite products, positive and negative electrode materials, semiconductors, photovoltaics, cement, and aluminum alloy die casting, high-temperature furnaces such as carbon furnaces, calcining furnaces, pre-carbonization kilns, graphitization furnaces, and aluminum alloy melting furnaces are often used to provide the high-temperature environment or temperature field required for the forming of related products. After the high-temperature reaction, the furnace needs to be cooled down to accelerate the subsequent process. Heat extraction devices are usually configured to remove heat for rapid cooling. However, existing heat extraction devices still have a problem: the heat extraction structure has limited temperature resistance, and there is a risk of overheating during the heat extraction process. Once overheated, it is easily damaged. Therefore, there is an urgent need for a heat extraction device that can achieve overheat protection. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a heat extraction device with over-temperature protection function, which can effectively prevent the heat extraction structure from overheating.

[0004] The present invention also provides a heat extraction system including the above-mentioned heat extraction device with over-temperature protection function, and a heat extraction method based on the heat extraction system.

[0005] A heat-extracting device with over-temperature protection according to a first aspect of the present invention is used in a high-temperature kiln, comprising:

[0006] The heat extraction structure is provided with a heat extraction part for extending into the high-temperature kiln;

[0007] A high-temperature resistant outer layer is provided on the outside of the heat-collecting part, and a gap is left between it and the heat-collecting part to form a cooling cavity;

[0008] An air supply device is used to deliver cooling airflow to the cooling chamber to form a cooling air film on the outer wall of the heat exchange section.

[0009] The heat-collecting device with over-temperature protection function according to embodiments of the present invention has at least the following beneficial effects:

[0010] The material is contacted through a high-temperature resistant outer layer. The heat-collecting part of the heat-collecting structure is located inside the high-temperature resistant outer layer, thereby heating and absorbing energy through radiative heat transfer. Cooling airflow is also supplied to the cooling cavity between the heat-collecting part and the high-temperature resistant outer layer through an air supply device to form a cooling air film on the outer wall of the heat-collecting part for protection, thereby preventing the heat-collecting structure from overheating.

[0011] According to some embodiments of the present invention, the heat extraction structure is configured as a heat pipe.

[0012] According to some embodiments of the present invention, the heat-extracting part is provided with a medium channel.

[0013] According to some embodiments of the present invention, the outer wall of the heat-extracting part is provided with a plurality of finned plates, and the plurality of finned plates divide the cooling cavity into a plurality of chambers that are interconnected at the bottom.

[0014] According to some embodiments of the present invention, the finned plate is provided with a plurality of air passages connecting two adjacent chambers.

[0015] A heat extraction system according to a second aspect of the present invention, used in a high-temperature kiln, comprising:

[0016] The heat extraction device with over-temperature protection function described in the first aspect embodiment above;

[0017] The heat exchange device is connected to the output end of the air supply device after it delivers the cooling airflow to the cooling chamber.

[0018] The heat extraction system according to embodiments of the present invention has at least the following beneficial effects:

[0019] The heat extraction system in this embodiment adopts the heat extraction device with over-temperature protection function in the first aspect embodiment above. It utilizes the cooling airflow to form a cooling air film on the outer wall of the heat extraction part of the heat extraction structure for protection, which greatly reduces the risk of over-temperature of the heat extraction structure and makes the entire heat extraction system more stable and reliable. In addition, by setting a heat exchange device and connecting the output end of the cooling airflow delivered to the cooling chamber by the air supply device, it can exchange heat with the cooling airflow that has absorbed the heat of the heat extraction part, and store the heat or apply it to other places, so as to maximize the utilization of energy.

[0020] According to some embodiments of the present invention, the heat extraction system further includes a heat exchange cavity with a steam outlet at its top. The heat extraction structure has a cooling section extending into the heat exchange cavity. The heat extraction structure contains a heat extraction medium that can flow between the heat extraction section and the cooling section. The heat exchange device includes a supply source, a drive pump, a first heat exchanger, and an atomizing nozzle connected in sequence. The supply source stores a liquid heat exchange medium. The atomizing nozzle communicates with the heat exchange cavity. The drive pump is used to draw the heat exchange medium from the supply source and deliver it to the atomizing nozzle, where it is atomized and sprayed out. The first heat exchanger is connected to the output end of the cooling airflow supplied by the gas supply device to the cooling cavity, so as to utilize the cooling airflow to exchange heat with the heat exchange medium flowing through the first heat exchanger.

[0021] According to some embodiments of the present invention, the outer wall of the cooling section is provided with a plurality of heat-conducting fins.

[0022] According to some embodiments of the present invention, the heat exchange device further includes a second heat exchanger disposed between the first heat exchanger and the atomizing nozzle, the second heat exchanger being connected to the steam outlet to exchange heat with the heat exchange medium flowing through the second heat exchanger using the steam discharged from the steam outlet.

[0023] According to a third aspect of the present invention, a heat extraction method is used in a high-temperature kiln, and based on the heat extraction system of the second aspect of the present invention, the heat extraction method includes:

[0024] S1. When the furnace is in the heating stage, the heat exchange device stops. When the temperature of the heat extraction part reaches the preset temperature T1, the gas supply device works to deliver cooling airflow to the cooling chamber.

[0025] S2. When the furnace is in the initial stage of cooling and the furnace temperature is higher than the preset temperature T2, the heat exchange device works and introduces heat exchange medium into the heat exchange cavity to absorb the heat of the cooling section, while increasing the cooling airflow input pressure.

[0026] S3. When the furnace is in the middle of the cooling stage and the furnace temperature is at the preset temperature T3 to T2, the gas supply device stops supplying cooling airflow to the cooling chamber.

[0027] S4. When the furnace is in the late stage of cooling and the furnace temperature is lower than the preset temperature T3, the gas supply device will supply cooling airflow to the cooling chamber again.

[0028] Among them, T2>T1>T3.

[0029] The heat extraction method of this invention has the advantages of good heat extraction effect and high safety.

[0030] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0032] Figure 1 This is a schematic diagram of the structure of a heat extraction device according to an embodiment of the present invention;

[0033] Figure 2 This is a cross-sectional schematic diagram of the high-temperature resistant outer layer and the heat-generating part according to an embodiment of the present invention;

[0034] Figure 3 This is a longitudinal cross-sectional schematic diagram of the high-temperature resistant outer layer and the heat-generating part according to an embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the flow direction of cooling airflow within the cooling chamber according to an embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of the heat-extracting part according to another embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of the structure of a heat extraction system according to an embodiment of the present invention.

[0038] Icon labels:

[0039] Heat extraction structure 100, heat extraction part 110, finned plate 111, air passage 112, inner tube 113, outer tube 114, medium inlet 115, medium outlet 116, cooling part 120, heat-conducting fins 121;

[0040] High-temperature resistant outer layer 200, cooling cavity 201;

[0041] Gas supply device 300;

[0042] Heat exchange device 400, supply source 410, drive pump 420, first heat exchanger 430, atomizing nozzle 440, second heat exchanger 450;

[0043] Heat exchange chamber 500, steam outlet 501, drain pipe 510, separation plate 520;

[0044] 600 meters of trench. Detailed Implementation

[0045] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0046] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0047] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.

[0048] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0049] Reference Figures 1 to 3 As shown, a heat-extracting device with over-temperature protection function according to an embodiment of the present invention is used in a high-temperature kiln and includes: a heat-extracting structure 100, a high-temperature resistant outer layer 200, and a gas supply device 300.

[0050] The heat extraction structure 100 is provided with a heat extraction part 110, which is used to extend into the high-temperature kiln to remove the heat of the material inside the kiln.

[0051] The high-temperature resistant outer layer 200 is located on the outside of the heat-extracting part 110. A gap is left between the high-temperature resistant outer layer 200 and the heat-extracting part 110 to form a cooling cavity 201. The high-temperature resistant outer layer 200 is used to contact the material inside the furnace.

[0052] The air supply device 300 is used to deliver cooling airflow to the cooling chamber 201 to form a cooling air film on the outer wall of the heat exchange section 110, thereby controlling the temperature of the wall of the heat exchange section 110 and preventing it from being damaged by overheating. It is understood that the top of the cooling chamber 201 is provided with an airflow inlet and an airflow outlet corresponding to the air supply device 300, that is, the air supply device 300 is used to deliver cooling airflow from the top of the cooling chamber 201 to the cooling chamber 201.

[0053] It is understandable that, with the structural configuration of this embodiment, the material is contacted through the high-temperature resistant outer layer 200, and the heat-collecting part 110 of the heat-collecting structure 100 is located inside the high-temperature resistant outer layer 200. Therefore, the heat-collecting part 110 is heated and absorbs energy through radiative heat transfer. Cooling airflow is then supplied to the cooling cavity 201 between the heat-collecting part 110 and the high-temperature resistant outer layer 200 via the air supply device 300, forming a cooling air film on the outer wall of the heat-collecting part 110 for protection. This prevents the heat-collecting structure 100 from overheating. This allows for lower material performance requirements for the heat-collecting structure 100, expanding the range of material selection. For example, some common low-temperature steel materials can also be used in high-temperature heat-collecting applications, making it highly practical. Furthermore, compared to direct contact with the high-temperature material, radiative heat transfer provides more stable heat absorption and more uniform heating.

[0054] It is understood that the high-temperature resistant outer layer 200 is made of quartz material. In some specific embodiments, the high-temperature resistant outer layer 200 is a quartz tube, which is coaxially arranged with the heat-collecting part 110 of the heat-collecting structure 100.

[0055] As is well known, quartz material has excellent thermal stability and can withstand high temperatures. Using it as an outer contact material is stable and reliable. In addition, quartz material also has good electrical insulation at high temperatures, which can isolate electric and magnetic fields. When applied to this embodiment, the heat-extracting part 110 is not affected by the electric and magnetic fields inside the furnace, reducing external interference.

[0056] It is understood that in some specific embodiments, compressed air is used for cooling airflow, which is low in cost. Alternatively, nitrogen or carbon dioxide can also be used for cooling airflow, as these gases are chemically inert and have high thermal stability. The cooling airflow pressure can be 0 to 1 MPa.

[0057] Reference Figure 1 As shown, in some embodiments, the heat extraction structure 100 is configured as a heat pipe, and its heat extraction section 110 corresponds to the evaporation section of the heat pipe.

[0058] In other embodiments, unlike the heat pipe configuration described above, the heat-collecting section 110 of the heat-collecting structure 100 is provided with a medium channel, for example, such as... Figure 5 As shown, the heat extraction section 110 is coaxially equipped with an inner tube 113 and an outer tube 114. The upper end of the inner tube 113 has a medium inlet 115, and the lower end of the inner tube 113 is open. The outer tube 114 is sleeved on the outside of the inner tube 113, and a medium outlet 116 is provided on the outer tube 114. The cooling medium is introduced into the inner tube 113 through the medium inlet 115, flows downward through the opening at the bottom of the inner tube 113 into the outer tube 114, and then flows upward out through the medium outlet 116, thus forming a medium channel. It is understood that in actual installations, other numbers of sleeves or other forms of medium channels can also be used to form the medium channel.

[0059] Reference Figures 1 to 3 As shown, it can be understood that the outer wall of the heat exchange section 110 is provided with several finned plates 111, which divide the cooling cavity 201 into multiple interconnected chambers at the bottom. There can be two or more chambers; in this embodiment, two are provided. The airflow inlet and outlet of the cooling cavity 201 are provided for different chambers of the cooling cavity 201. When the air supply device 300 inputs cooling airflow into the cooling cavity 201, it will flow along the outer wall of the heat exchange section 110, bend at the bottom, and then flow out from the top to form a cooling air film for protection on the outer wall of the heat exchange section 110. The cooling airflow has a bending flow process in the cooling cavity 201, which can more fully form a cooling air film for protection on the outer wall of the heat exchange section 110, resulting in a good protection effect.

[0060] Reference Figures 2 to 4As shown, it can be understood that the fin plate 111 is provided with a number of air passages 112 that connect two adjacent chambers. In this way, during the flow of cooling air in the cooling chamber 201, a small part of the air will enter the adjacent chamber through the air passages 112 and then merge into the main air flow. At the same time, a cooling air film is formed at the rear end of the part where the main air flow merges, so that the cooling air film is formed more fully and evenly.

[0061] In addition, such as Figure 6 As shown, one embodiment of the present invention also provides a heat extraction system for a high-temperature kiln, the heat extraction system comprising: a heat extraction device with over-temperature protection function as described in the first aspect embodiment above, and a heat exchange device 400.

[0062] The heat exchange device 400 is connected to the output end of the air supply device 300 after it supplies cooling air to the cooling chamber 201. That is, the heat exchange device 400 is connected to the air outlet of the cooling chamber 201. Obviously, when the cooling air in the cooling chamber 201 cools and protects the heat-extracting part 110, it will absorb some of the heat from the heat-extracting part 110. This part of the heat can be reused as needed. Therefore, the heat exchange device 400 is set up to exchange heat with this part of the heat for heat storage or application to other places, so that the energy is maximized.

[0063] The heat extraction system in this embodiment uses the heat extraction device with over-temperature protection function in the above embodiment. It utilizes the cooling airflow to form a cooling air film on the outer wall of the heat extraction part 110 of the heat extraction structure 100 for protection, which greatly reduces the risk of overheating of the heat extraction structure 100 and makes the entire heat extraction system more stable, reliable and safe. In addition, by setting the heat exchange device 400 to be connected to the output end of the cooling airflow delivered to the cooling chamber 201 by the air supply device 300, it can exchange heat with the cooling airflow that has absorbed the heat of the heat extraction part 110, so as to store the heat or apply it to other places, thereby maximizing the utilization of energy.

[0064] It is understood that the heat extraction system in this embodiment also includes a heat exchange chamber 500, and the top of the heat exchange chamber 500 is provided with a steam outlet 501.

[0065] The heat extraction structure 100 is provided with a cooling section 120 extending into the heat exchange chamber 500. The heat extraction structure 100 is provided with a heat extraction medium that can flow between the heat extraction section 110 and the cooling section 120. In this embodiment, the heat extraction structure 100 is arranged vertically, with the bottom end being the heat extraction section 110 and the top end being the cooling section 120. The heat extraction structure 100 uses a heat pipe, and its heat extraction medium is liquid at room temperature.

[0066] The heat exchange device 400 includes a supply source 410, a drive pump 420, a first heat exchanger 430, and an atomizing nozzle 440 connected in sequence by pipes. The supply source 410 stores a liquid heat exchange medium. The atomizing nozzle 440 is connected to the heat exchange chamber 500. The drive pump 420 is used to draw the heat exchange medium from the supply source 410 and deliver it to the atomizing nozzle 440, where it is atomized and sprayed out. In this embodiment, multiple atomizing nozzles 440 are provided, arranged in a ring on the inner wall of the heat exchange chamber 500 and arranged in multiple layers vertically. The atomizing nozzles 440 can atomize and spray out the heat exchange medium, thereby increasing the contact area with the cooling part 120 of the heat extraction structure 100 and improving the heat exchange effect. The heat exchange medium can be water.

[0067] The first heat exchanger 430 is connected to the output end of the air supply device 300 after supplying cooling airflow to the cooling chamber 201, so as to use the cooling airflow from the cooling chamber 201 to exchange heat with the heat exchange medium flowing through the first heat exchanger 430, thereby increasing the temperature of the heat exchange medium. In addition, after the cooling airflow exchanges heat in the first heat exchanger 430, it is discharged to the high air through the pipe.

[0068] In this embodiment, during the heat extraction process, the heat extraction section 110 absorbs heat from the material inside the furnace, and the heat extraction medium is heated and transforms into a gaseous medium. The gaseous medium automatically rises and flows towards the cooling section 120. The heat exchange device 400 inputs the atomized heat exchange medium into the heat exchange chamber 500 through the atomizing nozzle 440. After the heat exchange medium comes into contact with the cooling section 120, it absorbs the heat from the cooling section 120 and turns into steam, which is discharged from the steam outlet 501, carrying away the heat from the cooling section 120, thus completing the heat exchange. This causes the gaseous medium in the cooling section 120 to be cooled and liquefied, under the influence of gravity and... Under the action of capillary force, the airflow flows to the heat exchange section 110 and then repeats the above cycle to continuously exchange heat. Meanwhile, the cooling airflow flowing out of the cooling chamber 201 carries the heat absorbed from the heat exchange section 110 and enters the first heat exchanger 430 to exchange heat with the heat exchange medium flowing through the first heat exchanger 430, thereby increasing the temperature of the heat exchange medium. As a result, the temperature of the heat exchange medium when it is subsequently sprayed out through the atomizing nozzle 440 is higher and closer to the saturation temperature, which is conducive to rapid evaporation to exchange heat and cool the cooling section 120 of the heat exchange structure 100, while maximizing the utilization of energy.

[0069] The heat extraction system of this embodiment removes heat from the material through the heat extraction structure 100 and exchanges heat with the heat exchange medium input by the heat exchange device 400 in the heat exchange chamber 500. The heat exchange medium absorbs heat and turns into steam to carry away the heat from the heat extraction structure 100, resulting in high heat exchange efficiency and good heat extraction effect of the entire system. In addition, the heat extraction system of this embodiment adopts the heat extraction device with over-temperature protection function in the above embodiment. The cooling airflow forms an air film protection on the outer wall of the heat extraction part 110 of the heat extraction structure 100, which greatly reduces the risk of over-temperature of the heat extraction structure 100, making the entire heat extraction system more stable, reliable and safe.

[0070] It is understandable that the outer wall of the cooling section 120 is provided with multiple heat-conducting fins 121. By providing multiple heat-conducting fins 121, the contact area with the heat exchange medium sprayed by the atomizing nozzle 440 is increased, thereby improving the heat exchange effect and accelerating the heat exchange rate.

[0071] It is understood that the heat exchange device 400 also includes a second heat exchanger 450 disposed between the first heat exchanger 430 and the atomizing nozzle 440. The three are connected by a pipe. In addition, the second heat exchanger 450 is also connected to the steam outlet 501 through a pipe so that the steam discharged from the steam outlet 501 can exchange heat with the heat exchange medium flowing through the second heat exchanger 450, thereby transferring heat to the heat exchange medium flowing through the second heat exchanger 450. This increases the temperature of the heat exchange medium when it is sprayed out of the atomizing nozzle 440, making it closer to the saturation temperature, which is conducive to rapid evaporation for heat exchange and cooling of the cooling section 120 of the heat extraction structure 100.

[0072] In this embodiment, the steam outlet 501 is connected to two pipelines. One pipeline leads part of the steam to the second heat exchanger 450, and the other pipeline leads part of the steam to other equipment that utilizes the steam. In addition, the second heat exchanger 450 is also connected to the trench 600. After heat exchange in the second heat exchanger 450, the steam liquefies and flows to the trench 600.

[0073] In some specific embodiments, a drain pipe 510 is provided at the bottom of the heat exchange cavity 500. The drain pipe 510 is connected to the trench 600. It is understood that after the heat exchange medium sprayed by the atomizing nozzle 440 turns into steam, when the temperature of the heat exchange cavity 500 is low, the steam may come into contact with the inner wall of the heat exchange cavity 500 and condense. At this time, the condensed heat exchange medium collects at the bottom of the heat exchange cavity 500 under its own weight and is discharged through the drain pipe 510.

[0074] Furthermore, a separation plate 520 is provided inside the heat exchange chamber 500. The separation plate 520 is located below the steam outlet 501. The separation plate 520 has multiple through holes facing the top of the heat exchange chamber 500. It can be understood that when the heat exchange medium is not completely vaporized, the steam will contain liquid. When the steam and the liquid mixed in it pass through the separation plate 520, they come into contact with the surface of the separation plate 520. The liquid is easy to stick directly to the surface of the separation plate 520, while the gas flows after contacting the separation plate 520 and flows out through the through holes toward the top of the heat exchange chamber 500, thus achieving the separation of gas and liquid in the steam. When the liquid on the surface of the separation plate 520 accumulates to a certain extent, it will drip down under its own weight or flow down from the inner wall of the heat exchange chamber 500, and finally collect at the bottom of the heat exchange chamber 500 and be discharged from the drain pipe 510.

[0075] An embodiment of the present invention also provides a heat extraction method for a high-temperature kiln. Based on the heat extraction system of the above embodiment, the heat extraction method includes:

[0076] S1. When the furnace is in the heating stage, since it is in the material processing stage, heat extraction should be minimized. During this process, the heat exchange device 400 is shut down, the drive pump 420 is not working, and the delivery of the heat exchange medium is stopped. Therefore, the heat extraction structure 100 cannot exchange heat with the heat exchange medium. When the temperature of the heat extraction part 110 of the heat extraction structure 100 reaches the preset temperature T1, the air supply device 300 works to deliver cooling airflow to the cooling chamber 201 to prevent the heat extraction structure 100 from overheating. T1 is set according to the temperature tolerance of the heat extraction part 110. In this embodiment, T1 is set to 550℃~1000℃.

[0077] S2. When the furnace is in the initial cooling stage and the furnace temperature is higher than the preset temperature T2, the heat exchange device 400 is activated simultaneously with the gas supply device 300. The heat exchange device 400 inputs a heat exchange medium into the heat exchange cavity 500 to absorb and remove the heat from the cooling section 120, and exchanges heat with the heat extraction structure 100. Thus, the heat extraction structure 100 can continuously extract heat and cool the furnace (radiative heat transfer). At the same time, the gas supply device 300 delivers cooling airflow to the cooling cavity 201 and increases the input pressure of the cooling airflow to form a cooling air film on the outer wall of the heat extraction section 110, which cools and protects the heat extraction section 110 and prevents it from overheating. In addition, the cooling airflow can contact the high-temperature resistant outer layer 200 to assist in heat exchange through heat conduction and heat convection, which can improve the cooling effect inside the furnace. Moreover, the flow of cooling air into the cooling cavity can effectively reduce radiative heat transfer and control the heat extraction rate to prevent it from skyrocketing. T2 is set according to the temperature tolerance of the heat-extracting part 110. Since the heat-extracting part 110 can be protected by the cooling airflow, T2 can be slightly higher than T1. In this embodiment, T2 is set to 600℃~1100℃.

[0078] S3. When the furnace is in the middle of the cooling stage and the furnace temperature is between the preset temperature T3 and T2, the radiative heat transfer effect weakens compared to the initial stage due to the decrease in furnace temperature. The heat extraction effect of the heat extraction unit 110 is poor. Therefore, the gas supply device 300 stops supplying cooling airflow to the cooling chamber 201. The cooling airflow in the cooling chamber 201 overflows at high temperature, reducing the amount of gas in the cooling chamber 201 (the presence of gas weakens radiative heat transfer), thus enhancing the radiative heat transfer effect and improving the heat extraction of the heat extraction unit 110. The cooling chamber 201 is equipped with an inlet vent valve and an outlet valve at the airflow inlet and outlet, respectively. After the gas supply device 300 stops supplying cooling airflow to the cooling chamber 201, both valves are opened, allowing the gas in the cooling chamber 201 to overflow at high temperature. In this embodiment, T3 is between 100℃ and 600℃.

[0079] S4. When the furnace is in the late stage of cooling and the furnace temperature is less than T3, the furnace temperature drops further and the radiative heat transfer effect is too weak. The heat extraction effect of the heat extraction part 110 is poor, resulting in a poor cooling effect in the furnace. Therefore, the gas supply device 300 is instructed to supply cooling airflow to the cooling chamber 201 again. The cooling airflow contacts the high-temperature resistant outer layer 200 and exchanges heat through heat conduction and heat convection to carry out the main cooling in the furnace in the later stage.

[0080] Among them, T2>T1>T3.

[0081] The above steps are used for heat extraction and cooling of high-temperature kilns, resulting in good cooling effect and high safety.

[0082] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A heat extraction device with over-temperature protection function, used in high-temperature kilns, characterized in that, include: The heat extraction structure (100) is provided with a heat extraction part (110) for extending into the high-temperature kiln. A high-temperature resistant outer layer (200) is provided on the outside of the heat-collecting part (110) and a gap is left between it and the heat-collecting part (110) to form a cooling cavity (201). An air supply device (300) is used to supply cooling airflow to the cooling chamber (201) to form a cooling air film on the outer wall of the heat exchange section (110); The gas supply device (300) is configured as follows: When the furnace is in the heating stage and the temperature of the heat extraction part (110) reaches the preset temperature T1, the gas supply device (300) works to deliver cooling airflow to the cooling chamber (201); When the furnace is in the initial cooling stage and the furnace temperature is higher than the preset temperature T2, the gas supply device (300) increases the cooling airflow input pressure. When the furnace is in the middle of the cooling stage and the furnace temperature is at the preset temperature T3~T2, the gas supply device (300) stops supplying cooling airflow to the cooling chamber (201); When the furnace is in the late stage of cooling and the furnace temperature is lower than the preset temperature T3, the gas supply device (300) supplies cooling airflow to the cooling chamber (201) again. Among them, T2>T1>T3.

2. The heat extraction device with over-temperature protection function according to claim 1, characterized in that: The heat extraction structure (100) is configured as a heat pipe.

3. The heat extraction device with over-temperature protection function according to claim 1, characterized in that: The heat exchange section (110) is provided with a medium channel.

4. The heat extraction device with over-temperature protection function according to claim 1, characterized in that: The outer wall of the heat extraction part (110) is provided with a plurality of finned plates (111), and the plurality of finned plates (111) divide the cooling cavity (201) into a plurality of chambers that are interconnected at the bottom.

5. The heat extraction device with over-temperature protection function according to claim 4, characterized in that: The finned plate (111) is provided with a plurality of air passages (112) that connect two adjacent chambers.

6. A heat extraction system for high-temperature kilns, characterized in that, include: The heat extraction device with over-temperature protection function as described in claim 1; The heat exchange device (400) is connected to the output end of the air supply device (300) after it supplies the cooling airflow to the cooling chamber (201).

7. The heat extraction system according to claim 6, characterized in that: It also includes a heat exchange chamber (500) with a steam outlet (501) at its top. The heat extraction structure (100) has a cooling section (120) extending into the heat exchange chamber (500). The heat extraction structure (100) contains a heat extraction medium that can flow between the heat extraction section (110) and the cooling section (120). The heat exchange device (400) includes a supply source (410), a drive pump (420), a first heat exchanger (430), and an atomizing nozzle (440) connected in sequence. The supply source (410) stores... The liquid heat exchange medium is connected to the heat exchange cavity (500) via the atomizing nozzle (440). The driving pump (420) is used to draw the heat exchange medium from the supply source (410) and deliver it to the atomizing nozzle (440), where it is atomized and sprayed out. The first heat exchanger (430) is connected to the output end of the air supply device (300) after delivering the cooling airflow to the cooling cavity (201), so as to use the cooling airflow to exchange heat with the heat exchange medium flowing through the first heat exchanger (430).

8. The heat extraction system according to claim 7, characterized in that: The outer wall of the cooling section (120) is provided with multiple heat-conducting fins (121).

9. The heat extraction system according to claim 7, characterized in that: The heat exchange device (400) further includes a second heat exchanger (450) disposed between the first heat exchanger (430) and the atomizing nozzle (440). The second heat exchanger (450) is connected to the steam outlet (501) to exchange heat with the heat exchange medium flowing through the second heat exchanger (450) using the steam discharged from the steam outlet (501).

10. A heat extraction method for high-temperature kilns, characterized in that: Based on the heat extraction system as described in claim 7, the heat extraction method includes: S1. When the furnace is in the heating stage, the heat exchange device (400) stops. When the temperature of the heat extraction part (110) reaches the preset temperature T1, the gas supply device (300) works to deliver cooling airflow to the cooling chamber (201). S2. When the furnace is in the initial stage of cooling and the furnace temperature is higher than the preset temperature T2, the heat exchange device (400) works and inputs heat exchange medium into the heat exchange cavity (500) to absorb the heat of the cooling section (120) and at the same time increases the cooling airflow input pressure. S3. When the furnace is in the middle of the cooling stage and the furnace temperature is at the preset temperature T3~T2, the gas supply device (300) stops supplying cooling airflow to the cooling chamber (201); S4. When the furnace is in the late stage of cooling and the furnace temperature is lower than the preset temperature T3, the gas supply device (300) supplies cooling airflow to the cooling chamber (201) again. Among them, T2>T1>T3.

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