Heat energy recovery system of movable graphitization furnace

Abstract

The invention provides a heat energy recovery system of a movable graphitization furnace, and belongs to the field of graphitization furnaces. The heat energy recovery system comprises a working station, wherein the movable graphitization furnace is suitable for high-temperature preparation of products in the furnace body area at the working station; the movable graphitization furnace is suitable for moving to the cooling station after power failure; the movable graphitization furnace is suitable for moving to the discharging station after the cooling operation is completed at the cooling station; the first waste heat recovery device is located at the discharging station, the first waste heat recovery device comprises a waste heat absorption bin with water and is suitable for receiving the filling materials in the high-temperature state, cooling is conducted through first cooling water, so that the primarily-cooled filling materials are obtained, and meanwhile first hot water is prepared; the second waste heat recovery device is located at the cooling station and is suitable for being inserted into the ventilation channel to guide out heat in the movable graphitization furnace, the second waste heat recovery device is suitable for enabling a heat carrier to flow through, and the heat carrier comprises water, fused salt and / or heat conduction oil.

Description

Technical Field

[0001] The present application mainly relates to the field of graphitization, and in particular to a heat recovery system for a movable graphitization furnace. Background Art

[0002] Graphitization production uses electrical energy to convert heat into carbon products in a furnace, heating them to temperatures above 2350°C. This converts the carbonaceous material into graphite. After this, the graphitization furnace and the products in the furnace cool down. During this time, the large amount of heat stored in the furnace needs to be released. Typically, the temperature of the materials in the furnace needs to be quickly reduced to below 400°C before the next step of unloading can be performed.

[0003] During the cooling phase after a power outage in the graphitization furnace, the temperature drops from high temperature to 1800°C. Due to the high temperature, heat recovery is difficult. On this basis, the heat energy is released slowly from the furnace core when the temperature drops from 1800°C to 1000°C. In addition, the products and auxiliary materials charged to the graphitization furnace are basically carbonaceous materials. When the material temperature is above 400°C, they will be greatly oxidized if exposed to air. Furthermore, in the traditional graphitization process, the graphitization furnaces are arranged side by side in the workshop with a small distance between the furnaces. In addition to meeting the basic graphitization loading and unloading operations, there is no extra space around and above the furnaces to install other equipment for heat recovery without affecting production. For the above reasons, there is basically no good way to recycle the graphitization waste heat generated in the existing graphitization production process. Summary of the Invention

[0004] The technical problem to be solved by the present application is to provide a heat energy recovery system for a movable graphitization furnace, which can conveniently and effectively realize heat energy recovery after a power outage of the graphitization furnace, thereby reducing the energy consumption and cost of graphitization production.

[0005] In order to solve the above technical problems, the present application provides a heat recovery system for a movable graphitization furnace, which is applicable to the movable graphitization furnace. The movable graphitization furnace includes a furnace body area, and the furnace body area is suitable for loading products and filling materials. The heat recovery system includes: a working station, and the movable graphitization furnace is suitable for performing high-temperature preparation on the products in the furnace body area at the working station; a cooling station, and the movable graphitization furnace is suitable for moving from the working station to the cooling station after a power outage, and the movable graphitization furnace is suitable for performing a cooling operation at the cooling station. The operation includes cooling the filling material; a furnace discharge station, the movable graphitization furnace is suitable for moving to the furnace discharge station after the cooling operation is completed at the cooling station; and a first waste heat recovery device, located at the furnace discharge station, the first waste heat recovery device includes a water-containing waste heat absorption silo, wherein the water-containing waste heat absorption silo is suitable for receiving the filling material in a high-temperature state, and cooling the filling material in the high-temperature state by the first cooling water located in the water-containing waste heat absorption silo to obtain preliminary cooling of the filling material, and at the same time produce the first hot water.

[0006] Optionally, the silo with water absorption waste heat includes a silo shell and one or more first heat exchange water pipes located in the silo shell, wherein the silo shell includes a double-layer steel plate structure, and the silo with water absorption waste heat includes a silo feed port and a silo discharge port located on the silo shell, and the silo shell is provided with a silo water inlet and a silo water outlet, and the silo water inlet and the silo water outlet are connected to the first heat exchange water pipe, and the filling material in the high temperature state is suitable for entering the silo with water absorption waste heat from the silo feed port.

[0007] Optionally, the first waste heat recovery device further includes a material cooler connected to the silo discharge port, and the material cooler is suitable for further cooling the preliminarily cooled filling material to obtain a final cooled filling material.

[0008] Optionally, the cooler includes a cooler inlet and a cooler outlet, the cooler inlet is connected to the silo outlet, and the cooler further includes a waste heat recovery circuit and a material cooling circuit, wherein the waste heat recovery circuit is close to the cooler inlet, and the material cooling circuit is close to the cooler outlet, the waste heat recovery circuit is suitable for cooling the preliminarily cooled filling material through a second cooling water to produce a second hot water, and the material cooling circuit is suitable for further cooling the filling material flowing through by circulating cooling water to obtain the final cooled filling material.

[0009] Optionally, the cold machine includes a cold machine shell and one or more second heat exchange water pipes and one or more third heat exchange water pipes located in the cold machine shell, wherein the cold machine includes a double-layer steel plate structure, the waste heat recovery circuit includes a first inlet and a first outlet, and the material cooling circuit includes a second inlet and a second outlet, wherein the first inlet and the first outlet are connected to the second heat exchange water pipe, and the second inlet and the second outlet are connected to the third heat exchange water pipe; the first inlet is located in the cold machine shell near the cold machine inlet, the second outlet is located in the cold machine shell near the cold machine outlet, and the first outlet and the second inlet are located in the cold machine shell near the middle section.

[0010] Optionally, the movable graphitization furnace further includes a refractory brick wall and an outer wall portion, an air duct is provided between the refractory brick wall and the outer wall portion, and the heat energy recovery system further includes a second waste heat recovery device located at the cooling station, the second waste heat recovery device being suitable for being inserted into the air duct at the cooling station to extract heat from the movable graphitization furnace.

[0011] Optionally, the second waste heat recovery device includes a waste heat recovery pipe, which includes a heat-resistant outer pipe and a heat-resistant inner pipe. The heat-resistant outer pipe is sleeved on the outside of the heat-resistant inner pipe, and the waste heat recovery pipe is suitable for allowing a heat carrier to flow through, wherein the heat carrier is suitable for flowing into the heat-resistant outer pipe and flowing out of the heat-resistant inner pipe, and the heat carrier is suitable for conducting heat discharged from the movable graphitization furnace during the flow process.

[0012] Optionally, the second waste heat recovery device further includes a heat carrier inlet and a heat carrier outlet, the two ends of the heat-resistant inner tube include an inner tube first end and an inner tube second end, and the two ends of the heat-resistant outer tube include an outer tube first end and a closed outer tube second end, wherein the inner tube second end is inserted into the heat-resistant outer tube and close to the outer tube second end, the heat carrier inlet is arranged at the outer tube first end of the heat-resistant outer tube, and the heat carrier outlet is arranged at the inner tube first end of the heat-resistant inner tube.

[0013] Optionally, the second waste heat recovery device is arranged above the cooling station, and the waste heat recovery pipe is suitable for being inserted into the furnace top auxiliary material of the movable graphitization furnace from above the cooling station to conduct heat discharged from the movable graphitization furnace, wherein the heat carrier includes water, molten salt and heat transfer oil.

[0014] Optionally, it also includes a heat-conducting pipe rack and a transmission device, wherein the heat-conducting pipe rack is suitable for carrying a plurality of the waste heat recovery pipes, and the transmission device is suitable for controlling the plurality of the waste heat recovery pipes so that the plurality of the waste heat recovery pipes are inserted into different depths of the auxiliary material, and the insertion depth of the waste heat recovery pipe corresponds to the temperature of the auxiliary material.

[0015] Optionally, the second waste heat recovery device is arranged on the side or bottom of the cooling station, and the waste heat recovery pipe is suitable for being inserted into the air duct to conduct away the heat discharged by the movable graphitization furnace, wherein the heat carrier includes water and heat transfer oil.

[0016] Compared with existing technologies, this application has the following advantages: The design of a heat recovery system based on a mobile graphitization furnace can generate hot water while cooling the charge, saving energy overall and being environmentally friendly and economical. In some preferred embodiments, based on the scenario of a mobile graphitization furnace, the waste heat recovery equipment can be flexibly arranged, improving the operational convenience and effectiveness of the heat recovery of the mobile graphitization furnace. In general, mobile graphitization moves the graphitization furnace. When the high-temperature furnace is cooled at the cooling station, there is no other operation. Waste heat absorption equipment can be installed in the space around the furnace to absorb heat in the furnace, accelerate cooling, and improve production efficiency. At the furnace discharge station, a water-absorbing waste heat silo and a cooler are installed (preferably set at the same time, or only a water-absorbing waste heat silo can be set). The graphitization furnace material and the product only account for one-third of the total volume, and two-thirds are bulk filling materials and resistor materials. The bulk material contains a large amount of heat energy, and the waste heat is recovered through the heat-absorbing silo and the heat-absorbing cooler. In actual production, the higher the furnace discharge temperature, the more stable the quality of the product (such as graphite negative electrode), the higher the production efficiency, the greater the waste heat in the bulk material, and the higher the cooling demand. The first waste heat recovery device of this application is more significant, and it can recover more waste heat while improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are included to provide a further understanding of the present application. They are incorporated into and constitute a part of this application. The accompanying drawings illustrate embodiments of the present application and, together with this specification, serve to explain the principles of the present application. In the accompanying drawings: Figure 1 This is a system block diagram of a heat recovery system for a movable graphitization furnace according to one embodiment of the present application; Figure 2 1 is a schematic structural diagram of a movable graphitization furnace applicable to a heat energy recovery system of a movable graphitization furnace according to an embodiment of the present application; Figure 3 Yes Figure 1 The structural schematic diagram of the first waste heat recovery device in the heat energy recovery system of a movable graphitization furnace is shown; Figure 4 Yes Figure 1 A schematic structural diagram of a second waste heat recovery device in a heat energy recovery system of a movable graphitization furnace is shown; Figure 5 Yes Figure 4 A schematic diagram of the use of the second waste heat recovery device in one working condition is shown; and Figure 6 Yes Figure 4 The diagram shows the use of the second waste heat recovery device under another working condition.

[0018] Reference numerals: The heat energy recovery system 10 of the movable graphitization furnace, the working station 11, the cooling station 121, the furnace discharge station 122, the first waste heat recovery device 13, and the second waste heat recovery device 14; Movable graphitization furnace 100, furnace body 101, product 102, filling material 103, furnace wall 104, refractory brick wall 1041, outer wall 1042, air duct 1043, heat-resistant outer tube 141, heat-resistant inner tube 142, heat medium inlet 143, heat medium outlet 144, outer tube first end 1411, outer tube second end 1412, inner tube first end 1421, inner tube second end 1422, and movable support mechanism 145; The waste heat silo with water absorption 131, the silo shell 1311, the first heat exchange water pipe 1312, the silo water inlet 1313, the silo water outlet 1314, the chiller 132, the chiller shell 1320, the waste heat recovery circuit 1321, the material cooling circuit 1322, the second heat exchange water pipe 1323, the third heat exchange water pipe 1324, the first inlet 1325, the first outlet 1326, the second inlet 1327, the second outlet 1328, the heat-resistant outer tube 141 and the heat-resistant inner tube 142. DETAILED DESCRIPTION

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the following is a brief introduction to the drawings required for describing the embodiments. Obviously, the drawings described below are merely examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without inventive effort. Unless otherwise apparent from the context or otherwise noted, the same reference numerals in the figures represent the same structure or operation.

[0020] As used in this application and the claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" are not intended to refer to the singular but may include the plural. Generally speaking, the terms "comprises" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list. A method or apparatus may also include other steps or elements.

[0021] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0022] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0023] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0024] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is solely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. Furthermore, while the terms used in this application are selected from commonly known and commonly used terms, some terms mentioned in this specification may have been selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant sections of this description. Furthermore, this application should be understood not only by the actual terms used, but also by the meaning implied by each term.

[0025] It should be understood that when a component is referred to as being “on another component,” “connected to another component,” “coupled to another component,” or “contacting another component,” it can be directly on, connected to, coupled to, or contacting the other component, or intervening components may be present. In contrast, when a component is referred to as being “directly on another component,” “directly connected to,” “directly coupled to,” or “directly contacting” another component, there are no intervening components. Similarly, when a first component is referred to as being “electrically in contact with” or “electrically coupled to” a second component, an electrical path exists between the first and second components that allows current to flow. This electrical path may include capacitors, coupled inductors, and / or other components that allow current to flow, even without direct contact between the conductive components.

[0026] This application proposes a heat recovery system 10 for a movable graphitization furnace (hereinafter referred to as "heat recovery system 10"). The heat recovery system is suitable for Figure 2The movable graphitization furnace 100 shown in the figure has a heat recovery system 10 comprising a working station 11, a cooling station 121 and a furnace discharge station 122, as well as a second waste heat recovery device 14 located at the cooling station 121 and a first waste heat recovery device 13 located at the furnace discharge station 122. Figure 2 The movable graphitization furnace 100 includes a furnace body area 101 and a product 102 located in the furnace body area 101. The movable graphitization furnace 100 is suitable for performing high-temperature preparation on the product 102 in the furnace body area 101 at a working station 11, and is suitable for moving from the working station 11 to a cooling station 121 after a power outage. The movable graphitization furnace 100 is suitable for performing a cooling operation at the cooling station 121, and the cooling operation includes cooling the filling material 103. After the cooling operation is completed, the movable graphitization furnace 100 is suitable for moving to the furnace discharge station 122. It should be noted that in the field of graphitization, the filling material 103 can be understood as a thermal insulation material and / or a resistance material. For example, the movable graphitization furnace 100 can be moved between the working station 11, the cooling station 121 and the furnace discharge station 122 by means of a vehicle or a ship. The movable graphitization furnace 100 in this embodiment has the advantages of being lightweight and movable compared to a traditional graphitization furnace.

[0027] Further, Figure 3 The schematic diagram of the first waste heat recovery device 13 included in the heat recovery system 10 is shown. The first waste heat recovery device 13 includes a waste heat absorbing silo 131 with water. Figure 2 In the furnace body area 101 of the movable graphitization furnace 100, there is also a filling material 103 around the workpiece 102. The water-containing waste heat absorption silo 131 is suitable for receiving the filling material 103 in a high-temperature state, and cooling the filling material 103 in a high-temperature state by the first cooling water located in the water-containing waste heat absorption silo 131 to obtain preliminary cooling of the filling material and simultaneously produce first hot water.

[0028] according to Figure 3The waste heat absorbing silo 131 with water includes a silo shell 1311 and a plurality of first heat exchange water pipes 1312 located in the silo shell 1311. It should be noted that in this embodiment, the number of first heat exchange water pipes 1312 is multiple, but the present application is not limited to this. In other embodiments of the present application, the number of first heat exchange water pipes 1312 can also be set to one. Specifically, the silo shell 1311 includes a double-layer steel plate structure, the silo with water absorption waste heat 131 includes a silo feed port B and a silo discharge port C located on the silo shell 1311, and the silo shell 1311 is provided with a silo water inlet 1313 and a silo water outlet 1314, which are connected to the first heat exchange water pipe 1312, and the first heat exchange water pipe 1312 forms a heat exchanger in the silo with water absorption waste heat 131, and the filling material 103 in a high temperature state is suitable for entering the silo with water absorption waste heat 131 from the silo feed port B. Further combined Figure 2 , Figure 2 The movable graphitization furnace 100 is suitable for discharging the filling material 103 from the valve A. In actual production, Figure 3 The silo feed port B of the silo with water absorption waste heat 131 is connected to the valve A of the movable graphitization furnace 100, so that the high-temperature filling material 103 is directly discharged from the valve A and then falls into the silo with water absorption waste heat 131 through the silo feed port B and completes preliminary cooling. This method is fast and convenient. On this basis, in some scenarios, in order to assist the smooth discharge of the filling material 103 in the movable graphitization furnace 100, the heat recovery system 10 can further add a grab or a suction machine to transfer the filling material 103 to the silo with water absorption waste heat 131, thereby improving the discharge efficiency of the system. The filling material treated by the silo with water absorption waste heat 131 is the preliminary cooled filling material, and the cooling water discharged from the silo outlet 1314 is the first hot water. Since this step is a preliminary cooling step, the temperature of the first hot water is relatively high.

[0029] Furthermore, the first waste heat recovery device 13 in this embodiment further includes a cooler 132 connected to the silo outlet C. Specifically, the cooler 132 includes a cooler inlet D and a cooler outlet E. The cooler 132 is suitable for further cooling the preliminary cooled filling material after being processed by the water-absorbing waste heat silo 131 to obtain the final cooled filling material and discharge it from the cooler outlet E. Therefore, combined with Figure 2 and Figure 3 In this embodiment, the high-temperature filling material 103 in the movable graphitization furnace 100 is cooled in sequence through paths A to E. The cooling method is convenient and has a good cooling effect. Figure 3In this embodiment, the chiller 132 is preferably set as two independent water circulation loops, namely the waste heat recovery loop 1321 and the material cooling loop 1322, wherein the waste heat recovery loop 1321 is close to the chiller inlet D, and the material cooling loop 1322 is close to the chiller outlet E. The waste heat recovery loop 1321 is suitable for cooling the preliminary cooled filling material obtained after treatment by the water-absorbing waste heat silo 131 through the second cooling water, and then converting the second cooling water into second hot water. The material cooling loop 1322 is suitable for further cooling the filling material flowing therethrough through circulating cooling water to obtain the final cooled filling material.

[0030] Specifically, according to Figure 3 The material cooler 132 includes a material cooler shell 1320 and a plurality of second heat exchange water pipes 1323 and a plurality of third heat exchange water pipes 1324 located in the material cooler shell 1320, wherein the material cooler 132 includes a double-layer steel plate structure, the waste heat recovery circuit 1321 includes a first inlet 1325 and a first outlet 1326, and the material cooling circuit 1322 includes a second inlet 1327 and a second outlet 1328, wherein the first inlet 1325 and the first outlet 1326 are connected to the second heat exchange water pipe 1323, and the second inlet 1327 and the second outlet 1328 are connected to the third heat exchange water pipe 1324. Figure 3 As shown, in this embodiment, taking into account the layout of the mobile graphitization furnace 100 as an actual production scenario of large-scale equipment, it is preferred that the first outlet 1326 be located near the cooler inlet D of the cooler housing 1320, the second inlet 1327 be located near the cooler outlet E of the cooler housing 1320, and the first inlet 1325 and the second outlet 1328 be located near the middle of the cooler housing 1320, thereby optimizing the wiring of the cooling pipes and the production space. In this embodiment, the waste heat recovery circuit 1321 reabsorbs and utilizes the heat from the initially cooled charge material after the initial cooling, converting it into other energy needs in the mobile graphitization production workshop; and the material cooling circuit 1322 ultimately cools the charge material to the temperature required for subsequent processing. It is preferred that the cooling water flowing through the third heat exchange water pipe 1324 be set as cooling circulating water, thereby reducing energy consumption and costs overall.

[0031] According to the above description, this embodiment adopts a method of multi-stage cooling and waste heat recovery after the high-temperature filling material 103 is discharged from the furnace discharge station 122 and then passed through the first waste heat recovery device 13. The waste heat recovery method is safe and reliable, and solves the problem of difficulty in cooling high-temperature filling materials (for example, usually above 2000 degrees Celsius). In addition, hot water is generated through heat exchange during the multi-stage cooling process, which can provide recycled and converted energy for graphitization generation, and is economical and environmentally friendly as a whole. Further preferably, according to Figure 1In this embodiment, the heat recovery system 10 further includes a second waste heat recovery device 14, which can cool the filling material 103 at the cooling station 121 in a manner different from that of the first waste heat recovery device 13. Specifically, Figure 2 The movable graphitization furnace 100 shown in FIG. 1 has a furnace wall portion 104. A partially enlarged structural diagram of the furnace wall portion 104 is shown in FIG. Figure 5 As shown, according to Figure 5 The furnace wall portion 104 of the movable graphitization furnace 100 includes a refractory brick wall 1041 and an outer wall portion 1042. An air duct 1043 is defined between the refractory brick wall 1041 and the outer wall portion 1042. The second waste heat recovery device 14 located at the cooling station 121 is adapted to be inserted into the air duct 1043 to extract heat from the interior of the movable graphitization furnace 100.

[0032] In this embodiment, according to Figure 4 and Figure 5 The second waste heat recovery device 14 is specifically implemented as a waste heat recovery pipe, specifically combined with Figure 4 The waste heat recovery pipe includes a heat-resistant outer pipe 141 and a heat-resistant inner pipe 142. The heat-resistant outer pipe 141 is sleeved on the outside of the heat-resistant inner pipe 142. The waste heat recovery pipe is suitable for allowing a heat carrier to flow through, wherein the heat carrier is suitable for flowing into the heat-resistant outer pipe 141 and flowing out of the heat-resistant inner pipe 142. During the flow process, the heat carrier is suitable for conducting heat discharged from the movable graphitization furnace 100. To be more specific, the second waste heat recovery device 14 also includes a heat carrier inlet 143 and a heat carrier outlet 144, the two ends of the heat-resistant inner tube 142 include an inner tube first end 1421 and an inner tube second end 1422, and the two ends of the heat-resistant outer tube 141 include an outer tube first end 1411 and a closed outer tube second end 1412, wherein the inner tube second end 1422 is inserted into the heat-resistant outer tube 141 and is close to the outer tube second end 1412, the heat carrier inlet 143 is arranged at the outer tube first end 1411 of the heat-resistant outer tube 141, and the heat carrier outlet 144 is arranged at the inner tube first end 1421 of the heat-resistant inner tube 142.

[0033] according to Figure 5 In this embodiment, the second waste heat recovery device 14 can be arranged on the side or bottom of the cooling station 121, wherein Figure 4 The waste heat recovery pipe shown is suitable for being inserted into the vent 1043 to conduct the heat discharged from the movable graphitization furnace 100, wherein the heat carrier includes water and heat transfer oil. Specifically, the vent 1043 is suitable for being connected to Figure 2In the furnace section 101 shown, during the high-temperature preparation of the product 102, a large amount of high-temperature flue gas is generated in the furnace section 101. This high-temperature flue gas is directed to the furnace wall section 104 through a built-in flow duct, thereby facilitating cooling by applying a flowing heat carrier through an external waste heat recovery pipe. Traditional graphitization furnaces are large in size and have limited production space, making it difficult to achieve a flexible layout that can accommodate waste heat recovery pipes that can be inserted into the duct 1043. Therefore, this embodiment, combined with a movable graphitization furnace, allows for flexible implementation of waste heat extraction methods.

[0034] Further, according to Figure 6 The second waste heat recovery device 14 can also be arranged above the cooling station 121. The waste heat recovery pipe is suitable for being inserted into the top auxiliary material of the movable graphitization furnace 100 from above the cooling station 121 to conduct the heat discharged by the movable graphitization furnace 100. The heat carrier includes water, molten salt and heat transfer oil. Figure 5 The difference shown is that the temperature of the auxiliary material on the top of the furnace is higher, so the composition of the heat carrier is adjusted to better achieve the heat conduction effect. On this basis, it is more preferred to further include a mobile support mechanism 145, and the mobile support mechanism 145 specifically includes a heat pipe rack and a transmission device, wherein the heat pipe rack is suitable for carrying multiple waste heat recovery pipes, and the transmission device is suitable for controlling multiple waste heat recovery pipes so that multiple waste heat recovery pipes are inserted into different depths of the auxiliary material, and the insertion depth of the waste heat recovery pipe corresponds to the temperature of the auxiliary material. In this way, the waste heat discharge of the auxiliary material on the top of the furnace can be flexibly achieved at the cooling station 121. It can be understood that, Figures 4 to 6 Although the second waste heat recovery device 14 is shown to be in the same heat recovery system 10 as the first waste heat recovery device 13, in actual application, the two devices can realize their respective functions in stages; and, in other embodiments, only the first waste heat recovery device 13 or the second waste heat recovery device 14 can be set according to actual production conditions, and this application does not limit this.

[0035] The following is a brief introduction to the complete waste heat recovery process in this embodiment using both the second waste heat recovery device 14 and the first waste heat recovery device 13 located at the cooling station 121. First, the movable graphitization furnace 100 located at the working station 11 performs high-temperature preparation on the product 102. After the preparation is completed, the movable graphitization furnace 100 moves to the cooling station 121 and is Figure 5 , the second waste heat recovery device 14 is inserted into the air passage 1043 between the refractory brick wall 1041 and the outer wall 1042 to cool down. In the cooling station 121, you can also refer to Figure 6 The second waste heat recovery device 14 is arranged to be inserted into the top of the movable graphitization furnace 100 so as to cool the auxiliary materials on the top of the furnace. Further, the movable graphitization furnace 100 moves from the cooling station 121 to the furnace discharge station 122, referring to Figure 2and Figure 3 At least part of the filling material 103 in the movable graphitization furnace 100 is discharged from the valve A and enters the water-absorbing waste heat silo 131 through the silo inlet B, so that the filling material 103 in a high-temperature state is initially cooled in the water-absorbing waste heat silo 131. Furthermore, the cooler inlet D of the cooler 132 is connected to the silo outlet C of the water-absorbing waste heat silo 131. The cooler 132 is suitable for further cooling the initially cooled filling material after being processed by the water-absorbing waste heat silo 131 to obtain the final cooled filling material and discharge it from the cooler outlet E. In this embodiment, the cooler 132 is preferably configured to have a waste heat recovery circuit 1321 and a material cooling circuit 1322 to achieve the cooling and waste heat recovery functions in stages.

[0036] It should be noted that in the field of graphitization furnace, the heat in the graphitization furnace is mainly stored in the product area in the furnace core (i.e. Figure 2 The furnace body area 101 shown in the figure) is the most heat transferred to the filling material 103 after the power outage. When recovering waste heat, it is more effective and convenient to take the filling material 103 out of the furnace for heat recovery. Therefore, compared with the first waste heat recovery device 13 and the second waste heat recovery device 14, the first waste heat recovery device 13 has the advantage of better waste heat recovery effect. But at the same time, in some production scenarios, when it is not necessary or difficult to export the filling material 103, the second waste heat recovery device 14 can be used. The embodiment of the present application has the advantage of flexible waste heat recovery due to the use of a movable graphitization furnace.

[0037] The basic concepts have been described above. It will be apparent to those skilled in the art that the above disclosures are merely examples and do not limit the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and revisions to the present application. Such modifications, improvements, and revisions are suggested in the present application and remain within the spirit and scope of the exemplary embodiments of the present application.

[0038] At the same time, this application uses specific terms to describe the embodiments of this application. For example, "one embodiment," "an embodiment," and / or "some embodiments" refer to a certain feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that "one embodiment," "an embodiment," or "an alternative embodiment" mentioned twice or multiple times in different locations in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application may be appropriately combined.

[0039] Similarly, it should be noted that, in order to simplify the description of this application and thus facilitate understanding of one or more embodiments of the application, the foregoing description of the embodiments of this application sometimes combines multiple features into a single embodiment, figure, or description thereof. However, this disclosure method does not mean that the subject matter of this application requires more features than those recited in the claims. In fact, the features of an embodiment may be fewer than all the features of the individual embodiments disclosed above.

[0040] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise stated, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of the individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining the number of digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the settings of such numerical values ​​are as accurate as possible within the feasible range.

[0041] Although the present application has been described with reference to the current specific embodiments, ordinary technicians in this technical field should recognize that the above embodiments are only used to illustrate the present application, and various equivalent changes or substitutions can be made without departing from the spirit of the present application. Therefore, as long as the changes and modifications to the above embodiments are within the scope of the essential spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. A heat recovery system for a movable graphitization furnace, characterized in that: Applicable to a movable graphitization furnace, the movable graphitization furnace includes a furnace body area, a refractory brick wall and an outer wall portion, the furnace body area is suitable for loading products and filling materials, and an air duct is provided between the refractory brick wall and the outer wall portion. The heat energy recovery system includes: A working station, wherein the movable graphitization furnace is suitable for performing high-temperature preparation on the product in the furnace body area at the working station; A cooling station, wherein the movable graphitization furnace is adapted to be moved from the working station to the cooling station after a power outage, and the movable graphitization furnace is adapted to be cooled at the cooling station, wherein the cooling operation includes cooling the charging material; A furnace unloading station, wherein the movable graphitization furnace is adapted to be moved to the furnace unloading station after the cooling operation is completed at the cooling station; a first waste heat recovery device, located at the furnace discharge station, comprising a waste heat absorption silo with water, wherein the waste heat absorption silo with water is adapted to receive the high-temperature filling material, and cool the high-temperature filling material by means of first cooling water in the waste heat absorption silo, so as to obtain preliminary cooling of the filling material and simultaneously produce first hot water; and A second waste heat recovery device is located at the cooling station. The second waste heat recovery device is suitable for being inserted into the air duct at the cooling station to extract heat from the movable graphitization furnace. The second waste heat recovery device is suitable for allowing a heat carrier to flow through. The heat carrier includes water, molten salt and / or heat transfer oil.

2. The heat recovery system according to claim 1, characterized in that: The silo with water absorbing waste heat includes a silo shell and one or more first heat exchange water pipes located in the silo shell, wherein the silo shell includes a double-layer steel plate structure, and the silo with water absorbing waste heat includes a silo feed port and a silo discharge port located on the silo shell. The silo shell is provided with a silo water inlet and a silo water outlet, and the silo water inlet and the silo water outlet are connected to the first heat exchange water pipe, and the filling material in the high temperature state is suitable for entering the silo with water absorbing waste heat from the silo feed port.

3. The heat recovery system according to claim 2, characterized in that: The first waste heat recovery device further includes a material cooler connected to the silo discharge port, and the material cooler is suitable for further cooling the preliminarily cooled filling material to obtain a final cooled filling material.

4. The heat recovery system according to claim 3, characterized in that: The cooler includes a cooler inlet and a cooler outlet, and the cooler inlet is connected to the silo outlet. The cooler further includes a waste heat recovery circuit and a material cooling circuit, wherein the waste heat recovery circuit is close to the cooler inlet, and the material cooling circuit is close to the cooler outlet. The waste heat recovery circuit is suitable for cooling the preliminarily cooled filling material through a second cooling water to produce a second hot water, and the material cooling circuit is suitable for further cooling the filling material flowing through it through circulating cooling water to obtain the final cooled filling material.

5. The heat recovery system according to claim 4, characterized in that: The material cooler includes a material cooler shell and one or more second heat exchange water pipes and one or more third heat exchange water pipes located in the material cooler shell, wherein the material cooler includes a double-layer steel plate structure, the waste heat recovery circuit includes a first inlet and a first outlet, and the material cooling circuit includes a second inlet and a second outlet, wherein, The first inlet and the first outlet are in communication with the second heat exchange water pipe, and the second inlet and the second outlet are in communication with the third heat exchange water pipe; The first inlet is located at a position of the cold machine shell close to the cold machine inlet, the second outlet is located at a position of the cold machine shell close to the cold machine outlet, and the first outlet and the second inlet are located at a position of the cold machine shell close to the middle section.

6. The heat recovery system according to claim 1, wherein: The second waste heat recovery device includes a waste heat recovery pipe, which includes a heat-resistant outer pipe and a heat-resistant inner pipe. The heat-resistant outer pipe is sleeved on the outside of the heat-resistant inner pipe. The waste heat recovery pipe is suitable for allowing the heat carrier to flow through, wherein the heat carrier is suitable for flowing into the heat-resistant outer pipe and flowing out of the heat-resistant inner pipe. During the flow process, the heat carrier is suitable for conducting heat discharged from the movable graphitization furnace.

7. The heat recovery system according to claim 6, characterized in that: The second waste heat recovery device also includes a heat carrier inlet and a heat carrier outlet, the two ends of the heat-resistant inner tube include an inner tube first end and an inner tube second end, and the two ends of the heat-resistant outer tube include an outer tube first end and a closed outer tube second end, wherein the inner tube second end is inserted into the heat-resistant outer tube and is close to the outer tube second end, the heat carrier inlet is arranged at the outer tube first end of the heat-resistant outer tube, and the heat carrier outlet is arranged at the inner tube first end of the heat-resistant inner tube.

8. The heat recovery system according to claim 6, wherein: The second waste heat recovery device is arranged above the cooling station, and the waste heat recovery pipe is suitable for being inserted into the furnace top auxiliary material of the movable graphitization furnace from above at the cooling station to conduct heat discharged from the movable graphitization furnace, wherein the heat carrier includes water, molten salt and heat transfer oil.

9. The heat recovery system according to claim 8, characterized in that: It also includes a heat-conducting pipe rack and a transmission device, wherein the heat-conducting pipe rack is suitable for carrying a plurality of the waste heat recovery pipes, and the transmission device is suitable for controlling the plurality of the waste heat recovery pipes so that the plurality of the waste heat recovery pipes are inserted into different depths of the auxiliary material, and the insertion depth of the waste heat recovery pipe corresponds to the temperature of the auxiliary material.

10. The heat recovery system according to claim 6, wherein: The second waste heat recovery device is arranged on the side or bottom of the cooling station, and the waste heat recovery pipe is suitable for being inserted into the air duct to conduct away the heat discharged by the movable graphitization furnace, wherein the heat carrier includes water and heat transfer oil.

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