Complementary heat exchange type sintering furnace waste heat recovery device

Abstract

The invention provides a complementary heat exchange type sintering furnace waste heat recovery device which is characterized in that a first sintering furnace and a second sintering furnace are each internally divided into a sintering cavity and a heat storage cavity, and a heat conduction mechanism capable of conducting heat generated in the sintering cavities into the heat storage cavities in a preset sintering stage is arranged in each sintering cavity; a heat storage mechanism for absorbing and storing heat is arranged in the heat storage cavity; the first heat exchange module comprises a first heat exchanger used for absorbing heat in the first sintering furnace and conducting the heat into the second sintering furnace after heat exchange. The second heat exchange module comprises a second heat exchanger, and the second heat exchanger is used for absorbing waste heat generated after the first heat exchanger conducts heat to the second sintering furnace and conducting the heat to the second sintering furnace and / or external equipment to be heated after heat exchange. The problems that due to the fact that an existing sintering furnace waste heat recovery device is low in overall waste heat recovery rate and single in waste heat utilization mode, energy waste is serious, waste heat recovery and utilization efficiency is low, operation stability is affected, and operation and maintenance cost is high are solved.

Description

Technical Field

[0001] This invention belongs to the technical field of waste heat recovery devices for sintering furnaces, and specifically relates to a complementary heat exchange type waste heat recovery device for sintering furnaces. Background Technology

[0002] Waste heat recovery from sintering furnaces is a technology that collects and utilizes excess heat from waste flue gas and furnace body heat through heat exchange devices to save energy, reduce consumption, and improve energy efficiency.

[0003] For example, the sintering furnace waste heat recovery device disclosed in CN108731489B includes a sintering furnace, a tempering box, and a waste heat recovery mechanism. The tempering box surrounds the outside of the sintering furnace, and the sintering furnace is provided with an exhaust port for discharging waste gas. The waste heat recovery mechanism includes a box body containing heat transfer oil, and a first thermometer for detecting the temperature of the heat transfer oil installed inside the box body. A first guide rail is fixed inside the box body, and a first heat dissipation box is slidably connected to the first guide rail. A first spring is fixed between the first heat dissipation box and the box body. A first gas pipe connects the first heat dissipation box and the exhaust port of the sintering furnace, and a first control valve and a gas pump are provided on the first gas pipe. A first partition is fixed on one side of the first heat dissipation box, and a second partition is fixed on the other side of the first heat dissipation box. However, the structure in the above patent still has the following application defects: First, only the waste heat from the flue gas is recovered, without utilizing the large amount of radiative and convective heat energy lost from the furnace surface, resulting in a low overall waste heat recovery rate and serious energy waste.

[0004] Second, the single utilization model lacks multi-path utilization measures for waste heat, which fails to meet diverse heating needs and results in low energy utilization efficiency.

[0005] Based on this, this application proposes a complementary heat exchange type sintering furnace waste heat recovery device to overcome the above problems. Summary of the Invention

[0006] The purpose of this invention is to solve the problems of low overall waste heat recovery rate and single waste heat utilization mode in existing sintering furnace waste heat recovery devices, which lead to serious energy waste, low waste heat recovery and utilization efficiency, and high operation and maintenance costs that affect operational stability.

[0007] To achieve the above objectives, the present invention provides a complementary heat exchange type sintering furnace waste heat recovery device, comprising a first sintering furnace, a second sintering furnace, a first heat exchange module, and a second heat exchange module; Both the first and second sintering furnaces are divided into sintering chambers and heat storage chambers. The sintering chamber is equipped with a heat conduction mechanism that can conduct the heat generated in the sintering chamber to the heat storage chamber during the preset sintering stage. The heat storage chamber is equipped with a heat storage mechanism for absorbing and storing heat. The first heat exchange module includes a first heat exchanger for absorbing heat in the first sintering furnace and transferring the heat to the second sintering furnace after heat exchange. The second heat exchange module includes a second heat exchanger, which is used to absorb the residual heat after the first heat exchanger conducts heat to the second sintering furnace and conducts the heat to the second sintering furnace and / or external equipment to be heated after the heat exchange.

[0008] Optionally, the heat conduction mechanism includes a fixed heat insulation plate sealed inside the sintering cavity. A movable heat insulation plate is provided on the side of the fixed heat insulation plate facing the heat storage cavity, which can approach or move away from the fixed heat insulation plate. Several heat conduction channels and sealing plates are alternately arranged on both the fixed heat insulation plate and the movable heat insulation plate. The several heat conduction channels and sealing plates on the fixed heat insulation plate and the movable heat insulation plate are adapted to each other so that heat can be isolated or conducted when the fixed heat insulation plate and the movable heat insulation plate are in a close or separate state.

[0009] Optionally, the fixed heat insulation plate has two guide rails symmetrically arranged on the side facing the heat storage cavity, and a slider is connected to each of the two guide rails. The upper and lower sides of the movable heat insulation plate are respectively connected to the sliders on the two guide rails.

[0010] Optionally, the heat storage mechanism includes four heat-conducting plates arranged sequentially along the extension direction of the heat storage cavity. The four heat-conducting plates form three heat storage spaces. Each heat storage space is equipped with a heat storage box. The heat storage box has several through holes arranged in a honeycomb pattern. Each through hole is filled with phase change heat storage material to form a heat storage layer.

[0011] Optionally, the first heat exchange module further includes a first gas supply main, a first fan, and a second gas supply main connected in sequence. One end of the first gas supply main is connected to the first sintering furnace, and one end of the second gas supply main is connected to the first heat exchanger, so as to absorb the heat in the first sintering furnace into the first heat exchanger through the first gas supply main, the first fan, and the second gas supply main.

[0012] Optionally, the first heat exchanger is provided with a plurality of heat exchange gas pipes arranged in a triangular pattern. Each heat exchange gas pipe is provided with a spiral guide plate for guiding the gas inside. The outer wall of each heat exchange gas pipe is provided with heat-conducting fins along its periphery. The heat-conducting fins are used to introduce heat from the outside of each heat exchange gas pipe into it.

[0013] Optionally, one end of the first heat exchanger is connected to a third gas main pipe, one end of the third gas main pipe is connected to a first gas branch pipe, one end of the first gas branch pipe is connected to a second fan, one end of the second fan is connected to a fourth gas main pipe, and one end of the fourth gas main pipe is connected to the sintering chamber of the second sintering furnace.

[0014] Optionally, the second heat exchanger is provided with a number of spiral heat exchange tubes, each spiral heat exchange tube including a cold water tube and a heat storage tube arranged sequentially from the inside to the outside. The cold water tube is filled with cold water for heat exchange, and the heat storage tube is filled with phase change heat storage material for absorbing and storing heat.

[0015] Optionally, the second heat exchanger is provided with a fourth gas main pipe, which is connected to the first gas branch pipe for supplying heat to the sintering chamber of the second sintering furnace.

[0016] Optionally, the second heat exchanger is provided with a fifth gas main pipe, one end of which is connected to a third gas branch pipe, which is used to supply heat to external equipment to be heated.

[0017] The beneficial effects of this invention are as follows: The complementary heat exchange type sintering furnace waste heat recovery device proposed in this invention comprises a sintering chamber and a heat storage chamber in both the first and second sintering furnaces. The sintering chamber is equipped with a heat-conducting mechanism that transfers heat generated during a predetermined sintering stage to the heat storage chamber. The heat storage chamber is equipped with a heat storage mechanism for absorbing and storing heat. A first heat exchange module is provided, including a first heat exchanger that absorbs heat from the first sintering furnace and then transfers it to the second sintering furnace. A second heat exchange module is also provided, including a second heat exchanger that absorbs the waste heat from the first heat exchanger after heat transfer to the second sintering furnace and then transfers it to the second sintering furnace and / or external heating equipment. Compared with existing sintering furnace waste heat recovery devices, this invention utilizes the heat-conducting and heat storage mechanisms to achieve primary heat recovery, fully utilizing the large amount of radiative and convective heat energy lost from the furnace surface, thereby reducing high-heat loss, improving the overall waste heat recovery rate, and reducing energy waste. By utilizing the first and second sintering furnaces, as well as the first and second heat exchange modules, complementary heat exchange and utilization of waste heat through various paths are achieved. By constructing multi-path utilization measures for waste heat, diverse heating demands are met, resulting in a significant improvement in energy utilization efficiency, high operational stability, and reduced maintenance costs.

[0018] As can be seen from the above, the technical solution of the present invention can effectively solve the problems of low overall waste heat recovery rate and single waste heat utilization mode of existing sintering furnace waste heat recovery devices, resulting in serious energy waste, low waste heat recovery and utilization efficiency, and high operation and maintenance costs that affect operational stability.

[0019] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0020] The present invention can be better understood by referring to the following description taken in conjunction with the accompanying drawings, in which the same or similar reference numerals are used throughout the drawings to denote the same or similar parts.

[0021] Figure 1 A schematic diagram of a complementary heat exchange type sintering furnace waste heat recovery device is shown from a first perspective according to an embodiment of the present invention. Figure 2 A schematic diagram of a complementary heat exchange type sintering furnace waste heat recovery device is shown from a second perspective according to an embodiment of the present invention. Figure 3 A cross-sectional view of a first sintering furnace according to an embodiment of the present invention is shown; Figure 4 A cross-sectional view of a second sintering furnace according to an embodiment of the present invention is shown; Figure 5 A cross-sectional view of a thermal storage tank according to an embodiment of the present invention is shown; Figure 6 A cross-sectional view of a first heat exchanger according to an embodiment of the present invention is shown; Figure 7 A cross-sectional view of a second heat exchanger according to an embodiment of the present invention is shown; Figure 8 A cross-sectional view of a spiral heat exchanger tube according to an embodiment of the present invention is shown.

[0022] Figure label: 1. First sintering furnace; 2. Second sintering furnace; 3. Sintering cavity; 4. Heat storage cavity; 5. First heat exchanger; 6. Second heat exchanger; 7. Insulation layer; 8. Fixed heat insulation plate; 9. Movable heat insulation plate; 10. Heat conduction channel; 11. Sealing plate; 12. Guide rail; 13. Slider; 14. Heat dissipation plate; 15. Nozzle; 16. Conical heat conduction cylinder; 1601. Spiral heat conduction channel; 17. Heat conduction plate; 18. Heat storage box; 1801. Through hole; 19. First gas transmission main pipe; 20. First fan; 21. Second 21. Gas main pipe; 22. First control valve; 23. Second control valve; 24. Heat exchange gas pipe; 2401. Spiral guide plate; 25. Heat conduction plate; 26. Third gas main pipe; 27. First gas branch pipe; 28. Second fan; 29. ​​Fourth gas main pipe; 30. Third control valve; 31. Second gas branch pipe; 32. Fourth control valve; 33. Spiral heat exchanger pipe; 3301. Cold water pipe; 3302. Heat storage pipe; 34. Fourth gas main pipe; 35. Fifth gas main pipe; 36. Third gas branch pipe. Detailed Implementation

[0023] To enable those skilled in the art to more fully understand the technical solutions of the present invention, exemplary embodiments of the present invention will be described more comprehensively and in detail below with reference to the accompanying drawings. Obviously, the one or more embodiments of the present invention described below are merely one or more specific ways to implement the technical solutions of the present invention, and are not exhaustive. It should be understood that other ways belonging to a general inventive concept can be used to implement the technical solutions of the present invention, and should not be limited to the embodiments described exemplary. Based on one or more embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0024] Reference Figure 1-8 The present invention provides a complementary heat exchange type sintering furnace waste heat recovery device, including a first sintering furnace 1, a second sintering furnace 2, a first heat exchange module and a second heat exchange module; The first sintering furnace 1 and the second sintering furnace 2 are each divided into a sintering chamber 3 and a heat storage chamber 4. The sintering chamber 3 is equipped with a heat conduction mechanism that can conduct the heat generated in the sintering chamber 3 to the heat storage chamber 4 in the preset sintering stage. The heat storage chamber 4 is equipped with a heat storage mechanism for absorbing and storing heat. The first heat exchange module includes a first heat exchanger 5 for absorbing heat in the first sintering furnace 1 and transferring the heat to the second sintering furnace 2 after heat exchange. The second heat exchange module includes a second heat exchanger 6, which is used to absorb the residual heat of the first heat exchanger 5 after heat conduction to the second sintering furnace 2 and conduct the heat to the second sintering furnace 2 and / or external equipment to be heated after heat exchange.

[0025] Specifically, the sintering chamber 3 achieves sintering of the material through heating elements arranged within its walls. Common heating elements include resistance wires and silicon carbide rods, which generate heat when energized, raising the temperature inside the sintering chamber 3 to the appropriate range required for sintering. During operation, the heating elements generate heat, causing the temperature inside the sintering chamber to rise. Under high-temperature conditions, the internal particles of the material undergo physicochemical changes such as diffusion and bonding, gradually becoming denser, and ultimately completing the sintering process.

[0026] In one embodiment, both the first sintering furnace 1 and the second sintering furnace 2 are provided with a heat insulation layer 7 for heat preservation.

[0027] In one specific embodiment, the insulation layer 7 is a layered structure made of carbon felt material.

[0028] Specifically, the carbon felt material has the characteristics of high temperature resistance and good heat insulation performance, which can effectively reduce the heat dissipation of sintering cavity 3 and heat storage cavity 4, thereby facilitating the heat recovery of sintering cavity 3.

[0029] In one embodiment, the heat conduction mechanism includes a fixed heat insulation plate 8 sealed in the sintering cavity 3. A movable heat insulation plate 9 is provided on the side of the fixed heat insulation plate 8 facing the heat storage cavity 4, which can approach or move away from the fixed heat insulation plate 8. A plurality of heat conduction channels 10 and sealing plates 11 are alternately arranged on both the fixed heat insulation plate 8 and the movable heat insulation plate 9. The plurality of heat conduction channels 10 and sealing plates 11 on the fixed heat insulation plate 8 and the movable heat insulation plate 9 are adapted to each other so that heat can be isolated or conducted when the fixed heat insulation plate 8 and the movable heat insulation plate 9 are in a fitted or separated state.

[0030] In one embodiment, two guide rails 12 are symmetrically arranged on the side of the fixed heat insulation plate 8 facing the heat storage cavity 4, and sliders 13 are connected to both guide rails 12. The upper and lower sides of the movable heat insulation plate 9 are respectively connected to the sliders 13 on the two guide rails 12.

[0031] Specifically, the heat-conducting grooves 10 and sealing plates 11, which are staggered on the fixed heat insulation plate 8 and the movable heat insulation plate 9, are adapted to each other. When the two are in contact, the sealing plate 11 can effectively block heat, achieving heat isolation between the sintering cavity 3 and the heat storage cavity 4, reducing unnecessary heat loss. When separated, the heat-conducting grooves 10 form channels, allowing the high-temperature heat generated in the sintering cavity 3 to be smoothly conducted to the heat storage cavity 4 for storage. At the same time, the movable heat insulation plate 9 is connected by the guide rail 12 and the slider 13, which can accurately and flexibly control the movable heat insulation plate 9 to move closer to or away from the fixed heat insulation plate 8, achieving rapid and stable heat isolation and conduction, and improving the waste heat utilization efficiency and operational stability of the sintering furnace. According to the sintering process, heat can be conducted and stored in a timely manner at preset sintering stages, such as during or after sintering, thereby significantly reducing heat loss and improving waste heat recovery rate and recovery efficiency.

[0032] In addition, the fixed heat insulation plate 8, the movable heat insulation plate 9 and the sealing plate 11 are all made of ceramic material. The ceramic material can effectively block the unexpected heat transfer between the sintering cavity 3 and the heat storage cavity 4. When they are attached, the high-efficiency heat insulation reduces the heat loss of the sintering cavity. When they are separated, the reliable heat conduction ensures that the heat is smoothly transferred to the heat storage cavity 4 for storage.

[0033] In addition, the non-connecting parts of the guide rail 12 and the slider 13 are also covered with ceramic material to enhance their high temperature resistance.

[0034] In one embodiment, a plurality of heat dissipation plates 14 are arranged on the side of the movable heat insulation plate 9 facing the heat storage cavity 4, and the plurality of heat dissipation plates 14 are used to accelerate the heat conduction speed.

[0035] Specifically, several heat dissipation plates 14 are made of metals with good thermal conductivity, such as copper and aluminum, to increase the contact area with heat, quickly disperse the heat conducted from the sintering cavity 3 and accelerate its transfer to the heat storage cavity 4, thereby improving the heat conduction efficiency.

[0036] In one embodiment, a plurality of nozzles 15 are symmetrically arranged vertically on the side of the heat storage cavity 4 near the movable heat insulation plate 9. These nozzles 15 are used to inject compressed air into the heat storage cavity 4 to create a negative pressure within the heat storage cavity 4 and absorb heat from the sintering cavity 3. Specifically, when the nozzles 15 inject compressed air into the heat storage cavity 4, according to fluid mechanics principles, the high-speed ejection of compressed air reduces the air pressure near the nozzle outlet, thereby creating a negative pressure environment within the heat storage cavity 4. Under the action of negative pressure, a pressure difference is formed between the sintering cavity 3 and the heat storage cavity 4, driving heat from the sintering cavity 3 to the heat storage cavity 4, achieving heat absorption and transfer. This structural design, which actively and effectively absorbs heat from the sintering cavity 3 into the heat storage cavity 4, improves the efficiency of heat conduction from the sintering cavity 3 to the heat storage cavity 4, allowing for more complete recovery and utilization of the heat generated in the sintering cavity 3, reducing heat accumulation and loss within the sintering cavity 3, and contributing to improved energy utilization efficiency and reduced energy consumption and operating costs of the waste heat recovery device of this invention.

[0037] In one embodiment, a conical heat-conducting cylinder 16 is disposed within the heat storage cavity 4, and a spiral heat-conducting groove 1601 is disposed within the conical heat-conducting cylinder 16. The spiral heat-conducting groove 1601 is used to conduct heat to the heat storage mechanism. Specifically, the conical heat-conducting cylinder 16 utilizes its special conical structure to guide heat flow within the cylinder due to changes in cross-section. The internal spiral heat-conducting groove 1601 further alters the heat conduction path. When heat conducted from the sintering cavity 3 enters the conical heat-conducting cylinder 16, it propels forward in a spiral shape along the spiral heat-conducting groove 1601. This spiral conduction method extends the heat conduction path within the conical heat-conducting cylinder 16, allowing the heat to contact the conical heat-conducting cylinder 16 more fully, thereby more efficiently conducting heat to the heat storage mechanism.

[0038] The combination of the conical heat-conducting cylinder 16 and the spiral heat-conducting groove 1601 greatly enhances the efficiency and uniformity of heat conduction, reduces heat loss during conduction, ensures that more heat can be absorbed and stored by the heat storage mechanism, improves energy utilization efficiency, and helps to enhance the stability and economy of the waste heat recovery device of the present invention.

[0039] In one embodiment, the heat storage mechanism includes four heat-conducting plates 17 arranged sequentially along the extension direction of the heat storage cavity 4. The four heat-conducting plates 17 form three heat storage spaces. Each heat storage space is provided with a heat storage box 18. The heat storage box 18 has a number of through holes 1801 arranged in a honeycomb pattern. Each through hole 1801 is filled with phase change heat storage material to form a heat storage layer.

[0040] Specifically, the three heat storage spaces are sequentially filled with three phase change heat storage materials with melting points ranging from low to high: paraffin wax, sodium sulfate, and erythritol. When heat enters the heat storage chamber 4, it comes into contact with the three heat storage spaces in sequence. Because the three heat storage spaces are filled with the three phase change heat storage materials with melting points ranging from low to high, the low-temperature heat is first absorbed by the low-melting-point paraffin wax and stored through a phase change. As the heat increases and the temperature rises, the medium-temperature heat is absorbed by sodium sulfate, and the high-temperature heat is absorbed by erythritol, achieving phased and temperature-gradient heat storage. This design can not only achieve heat storage but also accurately store heat according to different temperatures, improving the targeting and efficiency of heat storage. It avoids insufficient or wasted heat storage caused by temperature mismatch of a single phase change material, while also broadening the heat storage temperature range, enhancing the adaptability of the heat storage mechanism to heat under different operating conditions, and improving the overall stability and reliability of the device.

[0041] In addition, the four heat-conducting plates 17 are all made of metal with high thermal conductivity. They are arranged to divide the space in an orderly manner along the extension direction of the heat storage cavity 4 to form a heat storage space. At the same time, they efficiently conduct heat to the heat storage box 18 in each heat storage space, helping the phase change heat storage material to fully absorb and store heat.

[0042] In addition, the thermal storage box 18 can be made of stainless steel, carbon steel, or other metal materials. Metal materials provide high strength and high temperature resistance, enabling the thermal storage box 18 to withstand the significant pressure and heat generated during the thermal storage process, ensuring structural stability under complex operating conditions. It provides a stable container for the internally filled phase change thermal storage material, accurately transferring heat conducted to the storage space to the phase change thermal storage material, achieving effective heat storage, and ensuring stable heat release when needed, thus improving the thermal storage and release performance of the waste heat recovery device.

[0043] In one embodiment, the first heat exchange module further includes a first gas supply main 19, a first fan 20, and a second gas supply main 21 connected in sequence. One end of the first gas supply main 19 is connected to the first sintering furnace 1, and one end of the second gas supply main 21 is connected to the first heat exchanger 5, so as to absorb the heat in the first sintering furnace 1 into the first heat exchanger 5 through the first gas supply main 19, the first fan 20, and the second gas supply main 21.

[0044] In one embodiment, a first control valve 22 is provided at one end of the first gas supply main 19 that is connected to the first sintering furnace 1. The first control valve 22 is used to adjust the heat absorption of the first gas supply main 19.

[0045] In one embodiment, a second control valve 23 is provided at one end of the second gas main 21 that is connected to the first heat exchanger 5. The second control valve 23 is used to adjust the heat absorption of the second gas main 21.

[0046] Specifically, when the first control valve 22, the first fan 20, and the second control valve 23 are in the open state, the waste heat in the sintering chamber 3 and the heat storage chamber 4 of the first sintering furnace 1 are absorbed into the first heat exchanger 5, so as to efficiently collect heat from different parts of the first sintering furnace 1 and centrally transport it to the first heat exchanger 5, thereby realizing heat recovery and utilization. Furthermore, by adjusting the heat absorption capacity through the first control valve 22 and the second control valve 23, the heat recovery requirements under different heat recovery conditions can be flexibly adapted, improving the economic efficiency and stability of the invention's operation and enhancing the practicality and controllability of the sintering furnace waste heat recovery device.

[0047] In one specific embodiment, the first heat exchanger 5 is provided with a plurality of heat exchange gas pipes 24 arranged in a triangular pattern. Each heat exchange gas pipe 24 is provided with a spiral guide plate 2401 for guiding the gas inside, and the outer wall of each heat exchange gas pipe 24 is provided with heat-conducting plates 25 along its periphery. The heat-conducting plates 25 are used to introduce heat from the outside of each heat exchange gas pipe 24 into it. Specifically, each heat exchange gas pipe 24 arranged in a triangular pattern provides an orderly channel for the flow and heat exchange of heat exchange gases such as cold nitrogen. When the heat exchange gas enters the heat exchange gas pipe 24, the spiral guide plate 2401 inside causes the gas to flow in a spiral shape, prolonging the flow path and residence time of the gas in the pipe, and enhancing the convective heat transfer effect. Meanwhile, the heat-conducting fins 25, made of thermally conductive metal, arranged along the circumference of the outer wall of the heat exchange tubes, increase the contact area between each heat exchange tube 24 and the heat inside its outer shell. This allows for more efficient transfer of external heat into each heat exchange tube 24, enabling thorough heat exchange between the gas inside the tube and the heat outside through the tube wall. This allows the first heat exchanger 5 to achieve efficient gas-to-gas heat exchange within a limited space, improving the heat utilization efficiency of the waste heat recovery device.

[0048] In one embodiment, one end of the first heat exchanger 5 is connected to a third gas main pipe 26, one end of the third gas main pipe 26 is connected to a first gas branch pipe 27, one end of the first gas branch pipe 27 is connected to a second fan 28, one end of the second fan 28 is connected to a fourth gas main pipe 29, and one end of the fourth gas main pipe 29 is connected to the sintering chamber 3 of the second sintering furnace 2.

[0049] In one specific embodiment, a third control valve 30 for controlling the heat absorption is provided on the fourth gas supply main 29.

[0050] Specifically, after the first heat exchanger 5 completes heat exchange, the heat-absorbing gas, driven by the second fan 28, enters the sintering chamber 3 of the second sintering furnace 2 via the first gas branch pipe 27 and the fourth gas main pipe 29 to heat the sintering chamber 3 of the second sintering furnace 2. This preheats the sintering chamber 3, and after reaching a certain temperature, its own heating elements are activated to achieve sintering temperature rise. This allows for the utilization of the sintering waste heat from the first sintering furnace 1, reducing energy waste.

[0051] In one embodiment, one end of the third gas main pipe 26 is connected to a second gas branch pipe 31, one end of the second gas branch pipe 31 is connected to a second heat exchanger 6, and a fourth control valve 32 is provided thereon. The fourth control valve 32 is used to regulate the connection state of the third gas main pipe 26 and the second gas branch pipe 31.

[0052] In one specific embodiment, the second heat exchanger 6 is provided with a plurality of spiral heat exchange tubes 33. Each spiral heat exchange tube 33 includes a cold water tube 3301 and a heat storage tube 3302 arranged sequentially from the inside to the outside. The cold water tube 3301 is filled with cold water for heat exchange, and the heat storage tube 3302 is filled with phase change heat storage material for absorbing and storing heat.

[0053] Specifically, when the fourth control valve 32 is opened, the waste heat gas in the first heat exchanger 5 enters the second heat exchanger 6 through the third gas main pipe 26 and the second gas branch pipe 31. Inside the second heat exchanger 6, the heat from the waste heat gas is first transferred to the phase change heat storage material in the heat storage pipe 3302, which is sleeved outside the cold water pipe 3301, for storage. At the same time, the cold water in the cold water pipe 3301 exchanges heat with the heat storage pipe 3302, absorbing the heat transferred from the heat storage pipe, thus realizing gas-liquid heat exchange.

[0054] This structural design allows the phase change heat storage material filled in the heat storage pipe 3302 to actively absorb and store excess heat when there is sufficient waste heat gas, preventing the cold water from absorbing too much heat in a short time and causing insufficient heat exchange, thus stabilizing the heat exchange process. On the other hand, when the supply of waste heat gas is insufficient, the phase change heat storage material can release the stored heat to continue exchanging heat with the cold water pipe 3301, extending the heat exchange time, improving the overall heat exchange efficiency, and enhancing the adaptability of the sintering furnace waste heat recovery device to heat fluctuation conditions.

[0055] In one embodiment, a fourth gas supply main pipe 34 is provided on the second heat exchanger 6. The fourth gas supply main pipe 34 is connected to the first gas supply branch pipe 27 for supplying heat to the sintering chamber 3 of the second sintering furnace 2.

[0056] In one embodiment, a fifth gas main pipe 35 is provided on the second heat exchanger 6, and one end of the fifth gas main pipe 35 is connected to a third gas branch pipe 36, which is used to supply heat to external equipment to be heated.

[0057] It is worth noting that the complementary heat exchange type sintering furnace waste heat recovery device of the present invention also includes a control module, such as a host computer, for electrically controlling the above-mentioned electrical components.

[0058] Specifically, the first sintering furnace 1 and the second sintering furnace 2 of the present invention have the same internal and external pipeline connection structure, which enables them to alternately carry out material sintering and heat recovery, and to achieve complementary heat exchange through the first heat exchanger 5 and the second heat exchanger 6, so as to make full use of waste heat.

[0059] Furthermore, the aforementioned gas mains and branch pipes of the present invention are selectively made of high-temperature resistant SiC pipes, 310S metal pipes, or 304 stainless steel pipes, depending on their application area. Both the first fan 20 and the second fan 28 are automatically adjustable variable frequency fans. The shells of both the first heat exchanger 5 and the second heat exchanger 6 are made of aluminum silicate.

[0060] The complementary heat exchange type sintering furnace waste heat recovery device of the present invention performs waste heat recovery as follows: First, in the sintering chamber 3 of the first sintering furnace 1, the temperature inside the sintering chamber 3 is raised by energizing the heating element, and the material to be sintered completes the sintering process in a high-temperature environment. When it is necessary to transfer the heat from the sintering chamber 3 to the heat storage chamber 4, the fixed heat insulation plate 8 and the movable heat insulation plate 9 are separated by the slider 13 and the guide rail 12, so that the heat conduction grooves 10 on both form a channel, allowing the high-temperature heat generated in the sintering chamber 3 to be conducted to the heat storage chamber 4. At the same time, several heat dissipation plates 14 are arranged on the side of the movable heat insulation plate 9 facing the heat storage chamber 4 to accelerate the heat conduction speed.

[0061] During this process, nozzle 15 injects compressed air into the heat storage chamber 4 to create a negative pressure environment, driving the heat in the sintering chamber 3 to flow into the heat storage chamber 4. The heat passes through the conical heat-conducting cylinder 16 and moves forward in a spiral shape along the spiral heat-conducting groove 1601, contacting the three heat storage spaces in sequence, thus realizing the phased storage of heat according to the temperature gradient.

[0062] Then, when the first control valve 22, the first fan 20, and the second control valve 23 are opened, the residual heat of the sintering chamber 3 and the heat storage chamber 4 in the first sintering furnace 1 are absorbed into the first heat exchanger 5. At the same time, the spiral guide plate 2401 causes the heat exchange gas to flow in a spiral shape, and the heat-conducting plate 25 increases the contact area to achieve heat exchange.

[0063] Next, the heat exchange gas, after absorbing heat, is driven by the second fan 28 and enters the sintering chamber 3 of the second sintering furnace 2 through the first gas supply branch pipe 27 and the fourth gas supply main pipe 29 to heat the sintering chamber 3 of the second sintering furnace 2, preheat it, and after reaching a certain temperature, it turns on its own heating element to achieve sintering temperature rise.

[0064] Subsequently, when the fourth control valve 32 is opened, the waste heat gas in the first heat exchanger 5 enters the second heat exchanger 6 through the third gas main pipe 26 and the second gas branch pipe 31. The heat from the waste heat gas is first transferred to the phase change heat storage material in the heat storage pipe 3302 for storage, while the cold water in the cold water pipe 3301 exchanges heat with the heat storage pipe 3302 to achieve gas-liquid heat exchange.

[0065] Finally, heat can be supplied to the sintering chamber 3 of the second sintering furnace 2 through the fourth gas main pipe 34 and the first gas branch pipe 27, and / or to external equipment such as a drying room to be heated through the fifth gas main pipe 35.

[0066] It is worth noting that the preset sintering stage and the opening time of each control valve in this invention can be controlled and adaptively adjusted according to the actual working conditions and in conjunction with the temperature sensor set at the designated node. This invention does not limit this, and this control method is existing technology, so this invention will not elaborate further here.

[0067] The complementary heat exchange type sintering furnace waste heat recovery device proposed in this invention comprises a sintering chamber and a heat storage chamber in both the first and second sintering furnaces. The sintering chamber is equipped with a heat-conducting mechanism that transfers heat generated during a predetermined sintering stage to the heat storage chamber. The heat storage chamber is equipped with a heat storage mechanism for absorbing and storing heat. A first heat exchange module is provided, including a first heat exchanger that absorbs heat from the first sintering furnace and then transfers it to the second sintering furnace. A second heat exchange module is also provided, including a second heat exchanger that absorbs the waste heat from the first heat exchanger after heat transfer to the second sintering furnace and then transfers it to the second sintering furnace and / or external heating equipment. Compared with existing sintering furnace waste heat recovery devices, this invention utilizes the heat-conducting and heat storage mechanisms to achieve primary heat recovery, fully utilizing the large amount of radiative and convective heat energy lost from the furnace surface, thereby reducing high-heat loss, improving the overall waste heat recovery rate, and reducing energy waste. By utilizing the first and second sintering furnaces, as well as the first and second heat exchange modules, complementary heat exchange and utilization of waste heat through various paths are achieved. By constructing multi-path utilization measures for waste heat, diverse heating demands are met, resulting in a significant improvement in energy utilization efficiency, high operational stability, and reduced maintenance costs.

[0068] While one or more embodiments of the present invention have been described above, those skilled in the art will recognize that the present invention can be implemented in any other form without departing from its spirit and scope. Therefore, the embodiments described above are illustrative and not restrictive, and many modifications and substitutions will be apparent to those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A complementary heat exchange type sintering furnace waste heat recovery device, characterized in that, It includes a first sintering furnace, a second sintering furnace, a first heat exchange module, and a second heat exchange module; Both the first and second sintering furnaces are divided into sintering chambers and heat storage chambers. The sintering chamber is equipped with a heat conduction mechanism that can conduct the heat generated in the sintering chamber to the heat storage chamber during the preset sintering stage. The heat storage chamber is equipped with a heat storage mechanism for absorbing and storing heat. The first heat exchange module includes a first heat exchanger for absorbing heat in the first sintering furnace and transferring the heat to the second sintering furnace after heat exchange. The second heat exchange module includes a second heat exchanger, which is used to absorb the residual heat after the first heat exchanger conducts heat to the second sintering furnace and conducts the heat to the second sintering furnace and / or external equipment to be heated after the heat exchange.

2. The complementary heat exchange type sintering furnace waste heat recovery device according to claim 1, characterized in that, The heat conduction mechanism includes a fixed heat insulation plate sealed inside the sintering cavity. A movable heat insulation plate is provided on the side of the fixed heat insulation plate facing the heat storage cavity, which can approach or move away from the fixed heat insulation plate. Several heat conduction channels and sealing plates are alternately arranged on both the fixed heat insulation plate and the movable heat insulation plate. The heat conduction channels and sealing plates on the fixed heat insulation plate and the movable heat insulation plate are adapted to each other so that heat can be isolated or conducted when the fixed heat insulation plate and the movable heat insulation plate are in a close or separate state.

3. The complementary heat exchange type sintering furnace waste heat recovery device according to claim 2, characterized in that, The fixed heat insulation plate has two guide rails symmetrically arranged on the side facing the heat storage cavity. Each guide rail is connected to a slider. The upper and lower sides of the movable heat insulation plate are respectively connected to the sliders on the two guide rails.

4. The complementary heat exchange type sintering furnace waste heat recovery device according to claim 3, characterized in that, The heat storage mechanism includes four heat-conducting plates arranged sequentially along the extension direction of the heat storage cavity. The four heat-conducting plates form three heat storage spaces. Each heat storage space is equipped with a heat storage box. The heat storage box has several through holes arranged in a honeycomb pattern. Each through hole is filled with phase change heat storage material to form a heat storage layer.

5. The complementary heat exchange type sintering furnace waste heat recovery device according to claim 4, characterized in that, The first heat exchange module further includes a first gas supply main pipe, a first fan, and a second gas supply main pipe connected in sequence. One end of the first gas supply main pipe is connected to the first sintering furnace, and one end of the second gas supply main pipe is connected to the first heat exchanger, so as to absorb the heat in the first sintering furnace into the first heat exchanger through the first gas supply main pipe, the first fan, and the second gas supply main pipe.

6. The complementary heat exchange type sintering furnace waste heat recovery device according to claim 5, characterized in that, The first heat exchanger is provided with several heat exchange gas pipes arranged in a triangular pattern. Each heat exchange gas pipe is provided with a spiral guide plate for guiding the gas inside. The outer wall of each heat exchange gas pipe is provided with heat-conducting fins along its periphery. The heat-conducting fins are used to introduce heat from the outside of each heat exchange gas pipe into it.

7. The complementary heat exchange type sintering furnace waste heat recovery device according to claim 6, characterized in that, One end of the first heat exchanger is connected to a third gas main pipe, one end of the third gas main pipe is connected to a first gas branch pipe, one end of the first gas branch pipe is connected to a second fan, one end of the second fan is connected to a fourth gas main pipe, and one end of the fourth gas main pipe is connected to the sintering chamber of the second sintering furnace.

8. The complementary heat exchange type sintering furnace waste heat recovery device according to claim 7, characterized in that, The second heat exchanger is provided with several spiral heat exchange tubes. Each spiral heat exchange tube includes a cold water tube and a heat storage tube arranged sequentially from the inside to the outside. The cold water tube is filled with cold water for heat exchange, and the heat storage tube is filled with phase change heat storage material for absorbing and storing heat.

9. The complementary heat exchange type sintering furnace waste heat recovery device according to claim 8, characterized in that, The second heat exchanger is provided with a fourth gas main pipe, which is connected to the first gas branch pipe for supplying heat to the sintering chamber of the second sintering furnace.

10. The complementary heat exchange type sintering furnace waste heat recovery device according to claim 9, characterized in that, The second heat exchanger is equipped with a fifth gas main pipe, one end of which is connected to a third gas branch pipe, which is used to supply heat to external equipment to be heated.

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