A trolley furnace device with waste heat recovery function

Abstract

The present application provides a trolley furnace device with a waste heat recovery function, including at least two trolley furnace bodies, a material placement platform and a first heat exchange structure. The trolley furnace body can slide along a first direction on the material placement platform, and the trolley furnace body includes a preheating zone, a heating zone and a cooling zone. After the heating zone of the trolley furnace body in the present application completes heating of the material to be heat treated, the trolley furnace body is slid on the material placement platform to continue heating the next batch of materials to be heat treated on the material placement platform, thereby forming a mobile channel heating, without shutting down the heating equipment, and improving the heating efficiency; and the preheating zone of one trolley furnace body is connected to the cooling zone of another trolley furnace body through the first heat exchange structure, and after the trolley furnace body moves, a large amount of waste heat in the cooling zone of one trolley furnace body is directly transferred to the preheating zone of another trolley furnace body, thereby realizing waste heat recovery and reducing energy consumption.

Description

Technical Field

[0001] The present application relates to the technical field of trolley furnaces, and in particular to a trolley furnace device with a waste heat recovery function. Background Art

[0002] The trolley furnace is a periodic operation furnace used for heat treatment of various mechanical parts. The furnace bottom of the existing trolley furnace is a movable trolley. Before heating, the trolley is loaded outside the furnace, and then the traction mechanism pulls the trolley into the furnace for heating. After the heating is completed, the trolley is pulled out of the furnace to unload. During the cooling process of the furnace body, the temperature inside the furnace is still high, and a large amount of waste heat is wasted. In addition, the current trolley furnace is a single furnace operation, and the heating equipment needs to be turned on and off once for each heating, which is very inefficient for heating batch parts. Summary of the invention

[0003] In order to solve the problem that a large amount of waste heat is wasted during the cooling process of the current trolley furnace, and the trolley furnace is a single furnace operation, and the heating efficiency for batch parts and materials is low, the present application provides a trolley furnace device with a waste heat recovery function.

[0004] The present application provides a trolley furnace device with a waste heat recovery function, the trolley furnace device comprising at least two trolley furnace bodies, a material placement platform and a first heat exchange structure;

[0005] The bottom of the trolley furnace body is slidably connected to the top of the material placement platform, the trolley furnace body slides along the first direction on the material placement platform, and the material placement platform is used to place the material to be heat treated;

[0006] The trolley furnace body includes a preheating zone, a heating zone and a cooling zone, and the preheating zone, the heating zone and the cooling zone are distributed in sequence along the sliding direction of the trolley furnace body, and the first heat exchange structure is connected to the preheating zone of one of the trolley furnace bodies and the cooling zone of another trolley furnace body.

[0007] Wherein, the preheating zone of each trolley furnace body in the trolley furnace device is connected to the cooling zone of another trolley furnace body through the first heat exchange structure, wherein each preheating zone is connected to only one cooling zone.

[0008] Wherein, the at least two trolley furnace bodies are arranged in sequence along the second direction, and the projections of the two adjacent trolley furnace bodies in the first direction have a partial overlapping area;

[0009] The outer side walls of two adjacent trolley furnace bodies are fixedly connected in the overlapping area so that all the trolley furnace bodies can slide synchronously along the first direction.

[0010] Wherein, the heating zone is provided with a heater, and the heater is used to heat the material to be heat-treated.

[0011] Wherein, the heating zone of each trolley furnace body in the trolley furnace device is connected to the heating zone of another trolley furnace body through a second heat exchange structure.

[0012] Among them, the first heat exchange structure includes a plurality of heat pipes, both ends of the heat pipes are respectively inserted into the preheating zone of one trolley furnace body and the cooling zone of another trolley furnace body, and each heat pipe is inserted into the outer wall of the inner part of the trolley furnace body and is provided with a plurality of fins.

[0013] Wherein, the preheating zone includes a plurality of preheating sub-zones arranged along the first direction, and the cooling zone includes a plurality of cooling sub-zones arranged along the first direction;

[0014] Along the direction approaching the heating zone to the direction away from the heating zone, the multiple preheating sub-zones of one trolley furnace body correspond one to one with the multiple cooling sub-zones of another trolley furnace body, and each preheating sub-zone is connected to the corresponding cooling sub-zone through the heat pipe.

[0015] Wherein, if the balanced temperature of the preheating sub-zone and the cooling sub-zone connected by the heat pipe is greater than or equal to the first preset temperature, then the heat pipe is a sodium working medium heat pipe;

[0016] If the equilibrium temperature of the preheating sub-zone and the cooling sub-zone connected by the heat pipe is less than the first preset temperature and greater than or equal to the second preset temperature, the heat pipe is a potassium working medium heat pipe;

[0017] When the balanced temperature of the preheating sub-zone and the cooling sub-zone connected by the heat pipe is less than the second preset temperature, the heat pipe is a water working medium heat pipe.

[0018] Wherein, the trolley furnace device also includes a furnace door and a partition; the furnace doors are respectively arranged at the starting end of the preheating zone and the ending end of the cooling zone, and the furnace doors are slidably connected to the trolley furnace body so that the furnace door slides along the third direction on the trolley furnace body; the partition is arranged inside the trolley furnace body, and the partition is used to divide the preheating zone, the heating zone and the cooling zone into zones.

[0019] Wherein, the trolley furnace device further includes a track, and the track extends along the first direction. A pulley is provided at the bottom of the trolley furnace body, and the pulley is slidably connected to the track.

[0020] Compared with the prior art, the present application has the following beneficial effects: the trolley furnace device in the present application is provided with at least two trolley furnace bodies. After the heating zone of the trolley furnace body completes heating of the material to be heat treated, the trolley furnace body is made to slide on the material placement platform to continue heating the next batch of materials to be heat treated on the material placement platform, thereby forming a mobile channel heating, without shutting down the heating equipment, thereby improving the heating efficiency; and the preheating zone of one trolley furnace body and the cooling zone of the other trolley furnace body are connected through the first heat exchange structure. After the trolley furnace body moves, a large amount of waste heat in the cooling zone of one trolley furnace body is directly transferred to the preheating zone of the other trolley furnace body, thereby realizing waste heat recovery and reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 is a schematic diagram of a trolley furnace device according to an exemplary embodiment.

[0023] Figure 2 1 is a schematic top view of a trolley furnace device shown in an embodiment.

[0024] Figure 3 It is a schematic diagram of the connection relationship between the trolley furnace body and the first heat exchange structure shown in the embodiment.

[0025] Figure 4 Schematic diagram of temperature change before and after the trolley furnace body moves according to the embodiment.

[0026] Figure 5 It is a schematic structural diagram of the first heat exchange structure shown in the embodiment. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application. It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other arbitrarily.

[0028] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] The present application provides a trolley furnace device with a waste heat recovery function, comprising at least two trolley furnace bodies, a material placement platform and a first heat exchange structure. The bottom of the trolley furnace body is slidably connected to the top of the material placement platform, and the trolley furnace body slides along a first direction on the material placement platform, and the material placement platform is used to place materials to be heat treated. The trolley furnace body includes a preheating zone, a heating zone and a cooling zone, which are distributed in sequence along the sliding direction of the trolley furnace body, and the first heat exchange structure is connected to the preheating zone of one of the trolley furnace bodies and the cooling zone of the other trolley furnace body. After the heating zone of the trolley furnace body in the present application finishes heating the material to be heat treated, the trolley furnace body is made to slide on the material placement platform to continue heating the next batch of materials to be heat treated on the material placement platform, thereby forming a mobile channel heating, without shutting down the heating equipment, thereby improving the heating efficiency; and the preheating zone of one trolley furnace body and the cooling zone of another trolley furnace body are connected through the first heat exchange structure. After the trolley furnace body moves, a large amount of waste heat in the cooling zone of one trolley furnace body is directly transferred to the preheating zone of another trolley furnace body, thereby realizing waste heat recovery and reducing energy consumption.

[0030] According to an exemplary embodiment, Figure 1-Figure 2 As shown, the present application provides a trolley furnace device with waste heat recovery function, including a first trolley furnace body 100, a second trolley furnace body 200, a material placement platform 300, a first heat exchange structure 400, a furnace door 500, a partition 600, a track 700 and a pulley 800.

[0031] The first trolley furnace body 100 and the second trolley furnace body 200 are used to heat the materials to be heat-treated on the material placement platform 300. The bottoms of the first trolley furnace body 100 and the second trolley furnace body 200 are respectively slidably connected to the top of the material placement platform 300. The first trolley furnace body 100 and the second trolley furnace body 200 can slide on the material placement platform 300 along the first direction, and the first direction is the extension direction of the trolley furnace body, that is, the X direction in the figure. The first trolley furnace body 100 and the second trolley furnace body 200 are arranged in sequence along the second direction (that is, the Y direction in the figure), and the projections of the first trolley furnace body 100 and the second trolley furnace body 200 in the first direction have a partial overlapping area, and the outer side walls of the first trolley furnace body 100 and the second trolley furnace body 200 are fixedly connected in the overlapping area. Specifically, welding can be used to fix part of the outer side walls of the two trolley furnace bodies so that all trolley furnace bodies can slide synchronously along the first direction together. The outer walls of the first trolley furnace body 100 and the second trolley furnace body 200 are covered with insulation materials to keep the temperature inside the furnace warm. By setting the two trolley furnace bodies fixedly connected to the material placement platform to slide together, after the trolley furnace body finishes heating the material to be heat treated, it can continue to heat the next batch of materials to be heat treated on the material placement platform by sliding, forming a mobile channel heating. Compared with the current fixed trolley furnace, which uses a traction mechanism to pull the trolley into the furnace for heating, the trolley furnace device of the present application is simple to operate, does not need to shut down the heating equipment in the furnace, and greatly improves the heating efficiency.

[0032] In the first trolley furnace body 100 and the second trolley furnace body 200, each trolley furnace body includes a preheating zone, a heating zone and a cooling zone. The preheating zone, the heating zone and the cooling zone are sequentially distributed along the sliding direction of the trolley furnace body (i.e., the X direction in the figure). The heating zone is provided with a heater (not shown in the figure), which is used to heat the material to be heat treated. The heater can be a heating electric furnace wire, an electric heating tube or other heating equipment. There is no heater in the preheating zone and the cooling zone. The preheating zone is used for preheating the material to be heat treated before heating, and the cooling zone is used for cooling the heated material.

[0033] like Figure 1As shown, the first trolley furnace body 100 includes a first preheating zone, a first heating zone 5 and a first cooling zone, wherein the first cooling zone includes a plurality of cooling sub-zones 1 to 4 arranged along the first direction, and the first preheating zone includes a plurality of preheating sub-zones 6 to 9 arranged along the first direction. The second trolley furnace body 200 includes a second preheating zone, a second heating zone 14 and a second cooling zone, wherein the second cooling zone includes a plurality of cooling sub-zones 10 to 13 arranged along the first direction, and the second preheating zone includes a plurality of preheating sub-zones 15 to 18 arranged along the first direction. Among them, the outer side wall of the first heating zone 5 to the preheating sub-zone 9 is welded to the outer side wall of the cooling sub-zone 10 to the second heating zone 14. The size of each preheating sub-zone, heating zone and cooling sub-zone can be a fixed value, which is convenient for mass production and cost reduction. Specifically, the width of the preheating sub-zone can be 4m and the depth can be 2m, that is, the width of the first trolley furnace body 100 is 4m and the overall furnace depth is 18m. The preheating zone and cooling zone are divided into multiple sub-zones to facilitate subsequent temperature monitoring and control. Suitable heat exchange structure and working fluid can also be selected according to the different temperatures corresponding to different zones.

[0034] In this embodiment, if Figure 1 As shown, a part of the first heat exchange structure 400 is connected to the preheating zone of the first trolley furnace body 100 and the cooling zone of the second trolley furnace body 200, and another part of the first heat exchange structure 400 is connected to the cooling zone of the first trolley furnace body 100 and the preheating zone of the second trolley furnace body 200. The first heat exchange structure 400 is used to balance the temperature between the two connected ones. By setting the first heat exchange structure 400, after the trolley furnace body slides, a large amount of waste heat in the cooling zone of the second trolley furnace body 200 is directly transferred to the preheating zone of the first trolley furnace body 100, and at the same time, a large amount of waste heat in the cooling zone of the first trolley furnace body 100 is transferred to the preheating zone of the second trolley furnace body 200, so that the waste heat recovery of the cooling zones of the two trolley furnace bodies is realized, so that the cooling zones in the two trolley furnace bodies cool down faster, the preheating zones heat up faster, the heat utilization rate is high, the energy consumption is reduced, and energy saving and environmental protection are achieved.

[0035] In some other embodiments, according to actual needs, only the first heat exchange structure 400 may be connected to the preheating zone of the first car furnace body 100 and the cooling zone of the second car furnace body 200, or only the first heat exchange structure 400 may be connected to the cooling zone of the first car furnace body 100 and the preheating zone of the second car furnace body 200, so as to recover the waste heat of the cooling zone of a specific car furnace body, and the application does not make any limitation on this.

[0036] In some other embodiments, three or more trolley furnace bodies can be selected. In this case, the preheating zone of each trolley furnace body in the trolley furnace device is connected to the cooling zone of another trolley furnace body through the first heat exchange structure 400, and each preheating zone is connected to only one cooling zone. For example, three trolley furnace bodies A / B / C are arranged in sequence along the second direction, the preheating zone of trolley furnace body A is connected to the cooling zone of trolley furnace body B through a part of the first heat exchange structure 400, the preheating zone of trolley furnace body B is connected to the cooling zone of trolley furnace body C through a part of the first heat exchange structure 400, the preheating zone of trolley furnace body C is connected to the cooling zone of trolley furnace body A through a part of the first heat exchange structure 400, and part of the outer side walls of the three trolley furnace bodies are welded and fixed to realize the waste heat recovery of the three trolley furnace bodies and the simultaneous sliding of the three trolley furnace bodies.

[0037] In this embodiment, from the direction close to the heating zone to the direction away from the heating zone, the multiple preheating sub-zones of the first car furnace body 100 correspond to the multiple cooling sub-zones of the second car furnace body 200, and the multiple preheating sub-zones of the second car furnace body 200 correspond to the multiple cooling sub-zones of the first car furnace body 100. Each preheating sub-zone is connected to the corresponding cooling sub-zone through the first heat exchange structure 400. Figure 3 As shown, the specific connection relationship is: cooling sub-zone 1 is connected to preheating sub-zone 18, cooling sub-zone 2 is connected to preheating sub-zone 17, cooling sub-zone 3 is connected to preheating sub-zone 16, cooling sub-zone 4 is connected to preheating sub-zone 15, preheating sub-zone 6 is connected to cooling sub-zone 13, preheating sub-zone 7 is connected to cooling sub-zone 12, preheating sub-zone 8 is connected to cooling sub-zone 11, and preheating sub-zone 9 is connected to cooling sub-zone 10. Heaters are arranged inside the first heating zone 5 and the second heating zone 14. The closer the preheating sub-zone and cooling sub-zone are to the two heating zones, the higher the temperature is, and the farther the preheating sub-zone and cooling sub-zone are from the two heating zones, the lower the temperature is. By connecting the preheating sub-zone and cooling sub-zone of corresponding step temperature, the waste heat is recycled and utilized, so that the temperature of the two connected zones is balanced, and the balanced temperature still meets the actual use condition that the farther away from the heating zone, the lower the temperature is.

[0038] In this embodiment, if Figure 3 and Figure 4 As shown, the first heat exchange structure 400 includes a plurality of heat pipes 410 and a plurality of fins 420. The two ends of the heat pipes 410 are respectively inserted into the preheating zone of one trolley furnace body and the cooling zone of another trolley furnace body. A plurality of fins 420 are arranged on the outer wall of each heat pipe 410 inserted into the inner part of the trolley furnace body. The fins 420 are used to increase the heat exchange area of ​​the heat pipe 410 inside the trolley furnace body and improve the heat exchange speed.

[0039] In a specific embodiment, Figure 4As shown, the first heat exchange structure 400 connected to the preheating sub-zone 4 and the cooling sub-zone 15 is selected as an illustration. The first heat exchange structure 400 includes 10 parallel heat pipes 410 and 60 fins 420. Each heat pipe 410 includes a main pipe 411 and a branch pipe 412. The branch pipe 412 is located at both ends of the main pipe 411. The branch pipe 412 is vertically arranged with the main pipe 411. The branch pipe 412 is used to be inserted into the inside of the trolley furnace body. The end of each branch pipe 412 is provided with 3 fins 420 arranged evenly. The diameter of the heat pipe 410 is 32 mm, the wall thickness is 3.5 mm, and the height of the fin 420 is 64 mm and the thickness is 3.5 mm. This application does not limit the number of heat pipes 410 and fins 420, which shall be subject to actual needs. The first heat exchange structures 400 of the cooling sub-zones 1 to 4 and the preheating sub-zones 15 to 18 are both of the shape structure described in the figure, and are "C" shaped as a whole, with only the size being different.

[0040] The first heat exchange structure 400 connecting the preheating sub-zones 6, 8, and 9 and the cooling sub-zones 10, 11, and 13 is different from the above, and is in an "S" shape as a whole, and has different sizes. For details, see Figure 3 . The welding surfaces of the first trolley furnace body 100 and the second trolley furnace body 200 can be set with a welding distance, and the first trolley furnace body 100 and the second trolley furnace body 200 are welded and fixed through an additional support plate, and the "S"-shaped first heat exchange structure 400 is passed through the gap formed by the support plate. As for the first heat exchange structure 400 connecting the preheating sub-zone 7 and the cooling sub-zone 12, it is directly connected, which is different from the above two and does not have a branch pipe. Designing different first heat exchange structures according to different preheating sub-zones and cooling sub-zones can ensure the temperature balance effect, save the required length of the heat pipe when connected at a close distance, and save costs.

[0041] The heat pipe 410 and the fin 420 can be made of stainless steel. The outer wall of the heat pipe 410 outside the trolley furnace body is covered with an insulation layer. The insulation material of the insulation layer can be phenolic resin or foamed polyurethane. The insulation layer is provided to prevent heat from being lost from the outer wall of the heat pipe, thereby improving the heat exchange efficiency of the heat pipe.

[0042] The heat exchange medium inside the heat pipe 410 can be set as needed according to the temperature, for example: if the temperature after equilibrium of the preheating sub-zone and the cooling sub-zone connected by the heat pipe 410 is greater than or equal to the first preset temperature, the heat pipe 410 is a sodium working medium heat pipe; if the temperature after equilibrium of the preheating sub-zone and the cooling sub-zone connected by the heat pipe 410 is less than the first preset temperature and greater than or equal to the second preset temperature, the heat pipe 410 is a potassium working medium heat pipe; if the temperature after equilibrium of the preheating sub-zone and the cooling sub-zone connected by the heat pipe 410 is less than the second preset temperature, the heat pipe 410 is a water working medium heat pipe. The melting point of sodium is higher than that of potassium, and it is more suitable for higher temperature heat cycles inside the heat pipe. Therefore, sodium working medium heat pipes are used in high temperature sections, potassium working medium heat pipes are used in medium temperature sections, and water working medium heat pipes are low in cost and easy to obtain, and are used in low temperature sections. The first preset temperature and the second preset temperature are preset values, which are set according to demand. For example, the first preset temperature can be set to 650°C and the second preset temperature can be set to 250°C. By setting heat pipes with different working fluids according to different temperatures after equilibrium, the waste heat recovery efficiency of cooling sub-zones with different temperatures can be guaranteed, temperature equilibrium can be quickly achieved under large temperature differences, and the manufacturing cost of the heat pipes can be reduced.

[0043] In some other embodiments, the trolley furnace device further includes a second heat exchange structure (not shown in the figure), and the heating zone of each trolley furnace body is connected to the heating zone of another trolley furnace body through the second heat exchange structure. The second heat exchange structure can adopt the same structure as the first heat exchange structure 400, consisting of a heat pipe and a fin, and the heat pipe is a sodium working medium heat pipe. By providing the second heat exchange structure, it is convenient to stabilize the temperature of the heating zones of the two connected trolley furnace bodies, so that the heating effect of each heating zone on the material is more stable and more uniform.

[0044] return Figure 1 and Figure 2 In the figure, the trolley furnace device is provided with a furnace door 500 and a partition 600. The starting end of the preheating zone and the ending end of the cooling zone of the first trolley furnace body 100 and the second trolley furnace body 200 are respectively provided with furnace doors 500, and the furnace doors 500 are slidably connected with the corresponding trolley furnace body so that the furnace door 500 slides along the third direction on the trolley furnace body. The third direction can be a vertical direction, that is, the Z direction in the figure. The furnace door 500 can be electrically controlled to realize the vertical lifting and opening and closing of the furnace door 500. The partition 600 is arranged inside the trolley furnace body, and the partition 600 is used to divide the preheating zone, the heating zone and the cooling zone. In some embodiments, a partition 600 can also be arranged between each preheating sub-zone and each cooling sub-zone to implement multi-stage and multi-level preheating and cooling.

[0045] like Figure 1 and Figure 2As shown, the track 700 is arranged above the material placement platform 300, and the track 700 extends along the first direction. A plurality of pulleys 800 are arranged at the bottom of the first trolley furnace body 100 and the second trolley furnace body 200. The pulleys 800 are slidably connected and cooperated with the track 700, so that the first trolley furnace body 100 and the second trolley furnace body 200 can slide back and forth along the first direction, making the moving operation of the trolley furnace device convenient and safe.

[0046] The working principle of the trolley furnace device of the present application is further explained below with a specific example:

[0047] Combination Figure 3 and Figure 5 As shown, the first trolley furnace body 100 and the second trolley furnace body 200 are firstly in the initial moving position of position (1), the first heating zone 5 and the second heating zone 14 are located above the material to be heat treated, the heaters in the first heating zone 5 and the second heating zone 14 are started to heat the material to be heat treated on the material placement platform 300, and when the heating set temperature is reached, the heating is completed and the material is kept warm. At this time, the temperatures of each zone are: 50°C for cooling sub-zone 1, 250°C for cooling sub-zone 2, 450°C for cooling sub-zone 3, 650°C for cooling sub-zone 4, 850°C for the first heating zone 5, 650°C for preheating sub-zone 6, 450°C for preheating sub-zone 7, 250°C for preheating sub-zone 8, and 50°C for preheating sub-zone 9; as well as 50°C for cooling sub-zone 10, 250°C for cooling sub-zone 11, 450°C for cooling sub-zone 12, 650°C for cooling sub-zone 13, 850°C for the second heating zone 14, 650°C for preheating sub-zone 15, 450°C for preheating sub-zone 16, 250°C for preheating sub-zone 17, and 50°C for preheating sub-zone 18.

[0048] Among them, cooling sub-zone 1 and preheating sub-zone 18, cooling sub-zone 2 and preheating sub-zone 17, preheating sub-zone 8 and cooling sub-zone 11, and preheating sub-zone 9 and cooling sub-zone 10 are all connected by water working medium heat pipes; cooling sub-zone 3 and preheating sub-zone 16, and preheating sub-zone 7 and cooling sub-zone 12 are all connected by potassium working medium heat pipes; cooling sub-zone 4 and preheating sub-zone 15, and preheating sub-zone 6 and cooling sub-zone 13 are all connected by sodium working medium heat pipes.

[0049] Then, the first trolley furnace body 100 and the second trolley furnace body 200 are moved together in the first direction, and moved by a preheating sub-zone distance, so as to continue heating the materials to be heat-treated placed continuously at the next position on the material placement platform 300, and the heated materials enter the cooling zone for cooling. At this time, the trolley furnace device is moved to the moving position of position (2) after being moved into place, and each preheating sub-zone, heating zone and cooling sub-zone have moved by a preheating sub-zone distance. Taking cooling sub-zone 1 as an example, it moves from 50°C to 250°C. At this time, the internal temperature of cooling sub-zone 1 is 250°C, and preheating sub-zone 18 connected to cooling sub-zone 1 moves from 50°C to room temperature 20°C. A temperature difference is generated between 250°C and 20°C. The first heat exchange structure 400 then performs heat exchange to balance the temperatures of cooling zone 1 and preheating sub-zone 18 so that the temperatures of the two are close to 135°C (250°C plus 20°C divided by 2), so as to recover the high-temperature waste heat of the cooling zone of the first trolley furnace body 100 to the preheating zone of the second trolley furnace body 200, so that the cooling zone cools down faster, the preheating zone heats up faster, the heat utilization rate is high, and the energy consumption is reduced. Similarly, taking the preheating sub-zone 8 as an example, it moves from the position of 250°C to the position of 50°C, and the cooling sub-zone 11 connected to the preheating sub-zone 8 moves from the position of 250°C to the position of 450°C. The first heat exchange structure 400 balances the temperature so that the two temperatures are close to 250°C, so as to simultaneously recover the high-temperature waste heat of the cooling zone of the second trolley furnace body 200 to the preheating zone of the first trolley furnace body 100. The situation of other preheating sub-zones and cooling sub-zones is the same and will not be repeated. Then repeat the above-mentioned moving steps to continuously heat all the materials on the material placement platform.

[0050] It should be noted that the first car furnace body 100 and the second car furnace body 200 can slide back and forth along the first direction. When the first car furnace body 100 and the second car furnace body 200 move from left to right to the end, the operator can take away the heated materials and continue to place new materials to be heat treated. The first car furnace body 100 and the second car furnace body 200 then move from right to left again to continue the mobile channel heating of the new materials to be heat treated.

[0051] In summary, the trolley furnace device of the present application allows a large amount of waste heat in the cooling zone to be transported to the preheating zone through the heat exchange structure, reducing the waste of waste heat in the trolley furnace body during the cooling process. The waste heat causes the temperature in the preheating zone to rise rapidly, and the temperature can be quickly increased before the material in the preheating zone enters the heating zone, so that the heating zone consumes less energy, achieving high efficiency and energy saving of the trolley furnace device. In addition, through the design of the working fluid, size, and shape in the heat pipe, not only the economy of the heat pipe is guaranteed, but also the temperature balance can be quickly achieved when there is a large temperature difference between the cooling zone and the preheating zone. After the heating is completed, the mobile trolley furnace body can continue the heating work when it is in the next position of the material placement platform. There is no need to turn off the heating equipment and there is no need to wait for the material to be moved out of the furnace. The trolley furnace device of the present application has a simple structure, convenient operation during the working process, and the furnace body is placed on a fixed track, which has high safety.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A trolley furnace device with waste heat recovery function, characterized in that: The trolley furnace device comprises at least two trolley furnace bodies, a material placement platform and a first heat exchange structure; The bottom of the trolley furnace body is slidably connected to the top of the material placement platform, the trolley furnace body slides along the first direction on the material placement platform, and the material placement platform is used to place the material to be heat treated; The trolley furnace body comprises a preheating zone, a heating zone and a cooling zone, wherein the preheating zone, the heating zone and the cooling zone are sequentially distributed along the sliding direction of the trolley furnace body, and the first heat exchange structure is connected to the preheating zone of one of the trolley furnace bodies and the cooling zone of another trolley furnace body; The preheating zone of each trolley furnace body in the trolley furnace device is connected to the cooling zone of another trolley furnace body through the first heat exchange structure, wherein each preheating zone is connected to only one cooling zone; The first heat exchange structure includes a plurality of heat pipes, both ends of which are respectively inserted into the preheating zone of one trolley furnace body and the cooling zone of another trolley furnace body, and a plurality of fins are provided on the outer wall of each heat pipe inserted into the inner part of the trolley furnace body.

2. The trolley furnace device with waste heat recovery function according to claim 1 is characterized in that: The at least two trolley furnace bodies are arranged in sequence along the second direction, and projections of two adjacent trolley furnace bodies in the second direction have a partial overlapping area; The outer side walls of two adjacent trolley furnace bodies are fixedly connected in the overlapping area so that all the trolley furnace bodies can slide synchronously along the first direction.

3. The trolley furnace device with waste heat recovery function according to claim 2 is characterized in that: The heating zone is provided with a heater, and the heater is used to heat the material to be heat-treated.

4. The trolley furnace device with waste heat recovery function according to claim 3 is characterized in that: The heating zone of each trolley furnace body in the trolley furnace device is connected to the heating zone of another trolley furnace body through a second heat exchange structure.

5. The trolley furnace device with waste heat recovery function according to claim 1 is characterized in that: The preheating zone includes a plurality of preheating sub-zones arranged along the first direction, and the cooling zone includes a plurality of cooling sub-zones arranged along the first direction; Along the direction approaching the heating zone to the direction away from the heating zone, the multiple preheating sub-zones of one trolley furnace body correspond one to one with the multiple cooling sub-zones of another trolley furnace body, and each preheating sub-zone is connected to the corresponding cooling sub-zone through the heat pipe.

6. The trolley furnace device with waste heat recovery function according to claim 5, characterized in that: If the balanced temperature of the preheating sub-zone and the cooling sub-zone connected by the heat pipe is greater than or equal to a first preset temperature, the heat pipe is a sodium working medium heat pipe; If the equilibrium temperature of the preheating sub-zone and the cooling sub-zone connected by the heat pipe is less than the first preset temperature and greater than or equal to the second preset temperature, the heat pipe is a potassium working medium heat pipe; When the balanced temperature of the preheating sub-zone and the cooling sub-zone connected by the heat pipe is less than the second preset temperature, the heat pipe is a water working medium heat pipe.

7. The trolley furnace device with waste heat recovery function according to claim 1, characterized in that: The trolley furnace device also includes a furnace door and a partition; the furnace doors are respectively provided at the starting end of the preheating zone and the ending end of the cooling zone, and the furnace doors are slidably connected to the trolley furnace body so that the furnace door slides along the third direction on the trolley furnace body; the partition is provided inside the trolley furnace body, and the partition is used to divide the preheating zone, the heating zone and the cooling zone into zones.

8. The trolley furnace device with waste heat recovery function according to claim 1, characterized in that: The trolley furnace device further includes a track extending along the first direction. A pulley is provided at the bottom of the trolley furnace body, and the pulley is slidably connected to the track.

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