Smelting furnace capable of utilizing combustion waste heat

Abstract

The utility model discloses a smelting furnace capable of utilizing combustion waste heat, which belongs to the technical field of natural gas smelting furnaces and comprises a furnace wall, a cavity is arranged in the furnace wall, a crucible is erected in the cavity through a fixing support, a combustor is fixedly connected to the bottom of the cavity and communicated with an oxygen pipe and a natural gas pipe, and the oxygen pipe extends out of the furnace wall to be communicated with an external oxygen supply device. The natural gas pipe extends out of the furnace wall and is communicated with an external natural gas supply device; the top of the cavity is connected with the side wall of the crucible in a sealed mode and communicated with a heat collecting pipe, and the other end of the heat collecting pipe is bent and extends into the crucible. The crucible and the combustor are arranged in the cavity of the furnace wall, the heat loss is reduced through sealed connection, the heat collecting pipe guides waste heat of combustion waste gas back to the crucible for secondary heating, and the furnace has the remarkable advantages that the energy efficiency is improved, the fuel consumption is reduced, and the cost is saved; the temperature stability is optimized, and the smelting quality is improved; the structure is compact, sealed, safe and environment-friendly, and meets the low-carbon trend.

Description

Technical Field

[0001] This utility model belongs to the field of natural gas smelting furnace technology, and in particular relates to a furnace that can utilize the waste heat of combustion. Background Technology

[0002] A smelting furnace is a widely used smelting equipment in the fields of metal and non-metal smelting. It is mainly used for smelting and heating precious metals such as gold, platinum, silver, copper, iron, stainless steel, aluminum alloys and other metals such as aluminum. High-temperature waste gas is generated during the use of smelting furnaces. The high-temperature waste gas also contains a lot of residual heat. If this heat is directly discharged, it will cause energy waste.

[0003] Therefore, a furnace capable of utilizing the waste heat from combustion is proposed. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model proposes a furnace that can utilize the waste heat of combustion.

[0005] To achieve the above objectives, this utility model provides a furnace capable of utilizing waste heat from combustion, comprising: a furnace wall, wherein a cavity is formed within the furnace wall, a crucible is mounted within the cavity via a fixed support, a burner is fixedly connected to the bottom of the cavity, the burner is connected to an oxygen pipe and a natural gas pipe, the oxygen pipe extends out of the furnace wall and is connected to an external oxygen supply device, and the natural gas pipe extends out of the furnace wall and is connected to an external natural gas supply device; the top of the cavity is sealed to the side wall of the crucible, and a heat collection pipe is connected to the top of the cavity, the other end of the heat collection pipe being bent and extending into the crucible.

[0006] Preferably, the crucible has a discharge port at the bottom, and a discharge pipe is connected below the discharge port. The discharge pipe extends out of the furnace wall and communicates with the outside. A plunger is installed inside the discharge port.

[0007] Preferably, a connecting rod is fixed to the top of the plunger, and the top of the connecting rod extends out of the crucible and is connected to an extension plate.

[0008] Preferably, the two ends of the extension plate extend horizontally outward to the top surface of the furnace wall, and the movable ends of the telescopic rods are fixedly connected to the bottom of both ends of the extension plate, and the fixed ends of the telescopic rods are fixedly connected to the top surface of the furnace wall.

[0009] Preferably, the discharge port is a cone shape that is wider at the top and narrower at the bottom, and the plunger is matched with the discharge port.

[0010] Preferably, a sleeve is slidably connected to the bottom of the heat collection tube, a sealing ring is fixedly connected to the joint between the sleeve and the heat collection tube, and the bottom of the sleeve is fixedly connected to the top surface of the cavity.

[0011] Preferably, a collar is fixedly connected to the bend at the top of the heat collection tube, and the movable end of the lifting assembly is fixedly connected to the outside of the collar.

[0012] Preferably, the lifting assembly includes a motor, which is fixedly connected to the top surface of the furnace wall. The motor is driven by a rotating shaft, which is arranged longitudinally. A movable ring is threaded onto the rotating shaft, and the movable ring is fixedly connected to the collar via a connecting rod.

[0013] Compared with the prior art, the present invention has the following advantages and technical effects:

[0014] By setting a cavity inside the furnace wall, using a fixed support to support the crucible, and arranging a burner at the bottom of the cavity that connects to the oxygen and natural gas pipes, the natural gas and oxygen are fully combusted in the cavity to heat the crucible. At the same time, by sealing the top of the cavity with the side wall of the crucible to form a closed heat conduction space, the heat loss due to combustion is effectively reduced. In particular, the other end of the heat collection pipe connected to the top of the cavity is bent and extended into the crucible, which can directly guide the large amount of waste heat carried by the high-temperature exhaust gas generated by combustion back into the crucible for secondary heating of the material, forming a dual heating mode of "primary combustion heating + secondary utilization of waste heat". The structural design offers significant advantages and technical benefits: First, it significantly improves energy efficiency. Compared to the heat waste caused by the direct emission of high-temperature exhaust gas from traditional furnaces, the recovery and reuse of waste heat through heat collection tubes greatly increases the utilization rate of combustion heat, significantly reduces the consumption of fuels such as natural gas, and effectively saves production costs. Second, it optimizes the temperature stability inside the crucible. The introduction of waste heat helps maintain temperature balance during the material heating process, reducing temperature fluctuations caused by combustion fluctuations. This is particularly suitable for the smelting of precious metals such as gold and platinum, as well as high-precision alloys, improving the uniformity of material melting and the quality of finished products. Third, it features a compact structure and strong sealing. The sealed connection design prevents the intrusion of external cold air and heat loss, while also preventing exhaust gas leakage, thus improving the safety and environmental friendliness of the equipment. Fourth, it combines energy saving and environmental protection benefits. By recovering waste heat, it reduces fuel consumption and pollutant emissions, aligning with the development trends of green manufacturing and low-carbon industry, and possessing significant economic and environmental value. Attached Figure Description

[0015] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0016] Fig. 1 This is a schematic diagram of the furnace structure of this utility model that can utilize the waste heat of combustion;

[0017] Fig. 2 This is a schematic diagram of the furnace structure of this utility model that can utilize the waste heat of combustion from another angle;

[0018] Fig. 3 This is a schematic diagram of the internal structure of the furnace that can utilize the waste heat of combustion according to this utility model;

[0019] Fig. 4 This is a schematic diagram showing the connection between the burner, oxygen pipe, and natural gas pipe in this utility model.

[0020] In the diagram: 1. Furnace wall; 2. Cavity; 3. Fixed support; 4. Crucible; 5. Burner; 6. Oxygen pipe; 7. Natural gas pipe; 8. Heat collector pipe; 9. Discharge port; 10. Discharge pipe; 11. Plunger; 12. Connecting rod; 13. Extension plate; 14. Telescopic rod; 15. Sleeve; 16. Collar; 17. Motor; 18. Rotating shaft; 19. Moving ring; 20. Connecting rod. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Reference Figs. 1 to 4 As shown, this embodiment provides a furnace capable of utilizing waste heat from combustion, comprising: a furnace wall 1, a cavity 2 formed within the furnace wall 1, a crucible 4 supported within the cavity 2 by a fixed bracket 3, a burner 5 fixedly connected to the bottom of the cavity 2, the burner 5 being connected to an oxygen pipe 6 and a natural gas pipe 7, the oxygen pipe 6 extending out of the furnace wall 1 and connected to an external oxygen supply device, and the natural gas pipe 7 extending out of the furnace wall 1 and connected to an external natural gas supply device; the top of the cavity 2 being sealed to the side wall of the crucible 4, and a heat collection pipe 8 connected to the top of the cavity 2, the other end of the heat collection pipe 8 being bent and extending into the crucible 4.

[0024] By setting a cavity 2 inside the furnace wall 1, using a fixed bracket 3 to support the crucible 4, and arranging a burner 5 at the bottom of the cavity 2 that connects the oxygen pipe 6 and the natural gas pipe 7, the natural gas and oxygen are fully combusted in the cavity 2 to heat the crucible 4. At the same time, by sealing the top of the cavity 2 with the side wall of the crucible 4 to form a closed heat conduction space, the heat loss due to combustion is effectively reduced. In particular, the other end of the heat collection pipe 8 connected to the top of the cavity 2 is bent and extended into the crucible 4, which can directly guide the large amount of waste heat carried by the high-temperature exhaust gas generated by combustion back into the crucible 4 for secondary heating of the material, forming a dual heating mode of "primary combustion heating + secondary utilization of waste heat". The structural design offers significant advantages and technical benefits: First, it significantly improves energy efficiency. Compared to the heat waste caused by the direct emission of high-temperature exhaust gas from traditional furnaces, the waste heat recovery and reuse achieved through the heat collection tube 8 greatly increases the utilization rate of combustion heat, significantly reduces the consumption of fuels such as natural gas, and effectively saves production costs. Second, it optimizes the temperature stability within the crucible 4. The introduction of waste heat helps maintain temperature equilibrium during the material heating process, reducing temperature fluctuations caused by combustion fluctuations. This is particularly suitable for the smelting of precious metals such as gold and platinum, as well as high-precision alloys, improving the uniformity of material melting and the quality of finished products. Third, it features a compact structure and strong sealing. The sealed connection design prevents the intrusion of external cold air and heat loss, while also preventing exhaust gas leakage, thus improving the safety and environmental friendliness of the equipment. Fourth, it combines energy saving and environmental protection benefits. By recovering waste heat, it reduces fuel consumption and pollutant emissions, aligning with the development trends of green manufacturing and low-carbon industry, and possessing significant economic and environmental value.

[0025] The design is further optimized by providing a discharge port 9 at the bottom of the crucible 4, with a discharge pipe 10 connected below the discharge port 9. The discharge pipe 10 extends out of the furnace wall 1 and connects to the outside. A plunger 11 is installed inside the discharge port 9.

[0026] A discharge port 9 is opened at the bottom of the crucible 4 and connected to a discharge pipe 10. A plunger 11 is installed inside the discharge port 9. This design, through the sealing effect of the plunger 11 on the discharge port 9, can precisely control the timing and flow rate of the molten material discharged from the crucible 4, avoiding accidental leakage of high-temperature material when not in operation. The discharge pipe 10 extends to the outside of the furnace wall 1. Combined with the sealing function of the plunger 11, it can ensure the sealing of the inside of the crucible 4 during the melting process to maintain heat stability. At the same time, the material can be discharged in an orderly manner by operating the plunger 11 during discharge, reducing the risk of direct contact between personnel and high-temperature areas. In addition, the cooperation structure between the plunger 11 and the discharge port 9 is simple and reliable, which facilitates long-term stable operation in high-temperature environments, reduces the probability of production interruption due to discharge mechanism failure, improves the convenience and practicality of the overall furnace operation, and ensures efficient connection and safe control of each link in the smelting process of feeding, heating and discharging.

[0027] In a further optimized design, a connecting rod 12 is fixedly attached to the top of the plunger 11, and the top of the connecting rod 12 extends out of the crucible 4 and is connected to an extension plate 13.

[0028] The connection of the connecting rod 12 to the top of the plunger 11 and its tip extending out of the crucible 4 to connect the extension plate 13 significantly improves the convenience and controllability of the discharge operation. This design transfers the control components of the plunger 11 from the high-temperature area inside the crucible 4 to the outside of the furnace wall 1. Operators can directly adjust the position of the plunger 11 at room temperature through the extension plate 13, avoiding the limitations and safety hazards of manual operation caused by high temperature environment. The extension plate 13, as the operating fulcrum, expands the force application range, making the insertion, removal or lifting operation of the plunger 11 more labor-saving and precise. It can finely control the opening degree of the discharge port 9, thereby accurately regulating the discharge speed and flow rate of molten material. It is especially suitable for scenarios that require real-time adjustment of the discharge amount according to the smelting process (such as batch purification of precious metals, precise proportioning of alloy composition, etc.). In addition, the rigid connection structure between the connecting rod 12 and the extension plate 13 ensures the stability of the plunger 11 movement during operation, reduces the risk of jamming caused by high temperature deformation or uneven force, ensures the long-term reliable operation of the discharge mechanism, and further improves the operational safety and process adaptability of the furnace in actual production.

[0029] Further optimization of the scheme: the two ends of the extension plate 13 extend horizontally outward to the top surface of the furnace wall 1, and the movable ends of the telescopic rods 14 are fixedly connected to the bottom of both ends of the extension plate 13, and the fixed ends of the telescopic rods 14 are fixedly connected to the top surface of the furnace wall 1.

[0030] By setting telescopic rods 14 at the bottom of both ends of the extension plate 13 (the movable end is connected to the extension plate 13, and the fixed end is fixed to the top surface of the furnace wall 1), mechanized control and precise adjustment of the material discharge operation are realized. This design utilizes the telescopic function of the telescopic rods 14, allowing operators to remotely or automatically adjust the lifting and lowering of the plunger 11 by controlling the telescopic rods 14 (e.g., electrically or hydraulically driven), without the need for direct manual force application, significantly reducing the intensity and safety risks of manual operation in high-temperature environments. The rigid support structure of the telescopic rods 14 ensures that the extension plate 13 remains horizontal and stable during lifting and lowering, avoiding tilting or jamming of the plunger 11 due to uneven force, thereby achieving precise control of the opening degree of the discharge port 9, meeting the high-precision requirements of material discharge speed and flow rate for some metal smelting processes. In addition, the fixed connection between the telescopic rods 14 and the top surface of the furnace wall 1 enhances the stability of the overall structure, maintaining reliable performance during long-term high-frequency operation, reducing failures caused by mechanical fatigue, and improving the automation level and production efficiency of the furnace discharge process, making it particularly suitable for integrated applications in continuous and intelligent smelting production lines.

[0031] The design was further optimized so that the discharge port 9 is a cone shape with a larger top and a smaller bottom, and the plunger 11 is matched with the discharge port 9.

[0032] The discharge port 9 is designed as a cone shape with a larger upper part and a smaller lower part, and matched with a corresponding conical plunger 11. This conical structure utilizes the principle of inclined sealing, so that the plunger 11 and the discharge port 9 form an annular compression sealing surface when in contact. Compared with the planar sealing, it can effectively cope with the deformation problem caused by the thermal expansion and contraction of materials under high temperature environment. Even when in a high-temperature molten state for a long time, it can still maintain good sealing performance and eliminate the risk of leakage of molten materials. At the same time, the cross-sectional area of ​​the conical discharge port 9 changes linearly with the insertion depth of the plunger 11. Operators can achieve precise adjustment of the discharge flow rate by a small displacement of the plunger 11, which is especially suitable for scenarios in precious metal smelting where the amount of material fed must be strictly controlled. In addition, the self-centering characteristic of the conical structure can reduce the frictional resistance when the plunger 11 is inserted and removed, reduce the operational failure caused by jamming, ensure a smooth and stable discharge process, and improve the long-term operational reliability and process adaptability of the furnace under high temperature conditions.

[0033] The scheme is further optimized by having a sleeve 15 slidably connected to the bottom of the heat collector tube 8, and a sealing ring fixedly connected to the joint between the sleeve 15 and the heat collector tube 8. The bottom of the sleeve 15 is fixedly connected to the top surface of the cavity 2.

[0034] By installing a sleeve 15 at the bottom of the heat collector tube 8 (the bottom of the sleeve 15 is fixed to the top surface of the cavity 2), the structural adaptability and reliability of the waste heat recovery system are significantly improved. The sleeve 15 guides the bottom of the heat collector tube 8, ensuring that the heat collector tube 8 can slide up and down while maintaining a sealed connection with the top surface of the cavity 2, preventing combustion exhaust gas from leaking from the connection. This ensures the efficiency of waste heat recovery and avoids the safety hazards caused by the leakage of high-temperature gas. In addition, the sliding connection structure provides convenience for the installation, disassembly and maintenance of the heat collector tube 8. Operators can flexibly adjust the depth of the heat collector tube 8 into the crucible 4 according to the requirements of the smelting process (such as optimizing the waste heat introduction position when smelting different materials), or quickly disassemble the heat collector tube 8 for cleaning or replacement during equipment maintenance. This improves the flexibility and practicality of the overall furnace structure and ensures that the waste heat recovery system can operate reliably for a long time under complex working conditions.

[0035] The scheme has been further optimized. A collar 16 is fixedly connected to the bend at the top of the heat collection tube 8, and the movable end of the lifting component is fixedly connected to the outside of the collar 16.

[0036] By fixing a collar 16 at the bend at the top of the heat collector tube 8 and connecting it to the movable end of the lifting assembly, this design utilizes the collar 16 as a connection hub between the heat collector tube 8 and the lifting assembly. This allows for precise height adjustment of the heat collector tube 8 via the lifting assembly, enabling flexible adjustment of the depth of the heat collector tube 8 into the crucible 4 according to the type, capacity, and process requirements of the molten material (e.g., for high-melting-point metals, the position of the heat collector tube 8 can be lowered to enhance residual heat conduction, or the heat collector tube 8 can be raised in the later stages of material melting to reduce overheating). The fixed connection between the collar 16 and the heat collector tube 8, combined with the sliding guide function of the bottom sleeve 15, forms a residual heat introduction structure that is "controllable in both directions and precisely adjustable in position," enhancing the equipment's adaptability to complex working conditions and ease of operation.

[0037] The scheme is further optimized. The lifting component includes a motor 17, which is fixed to the top surface of the furnace wall 1. The motor 17 is connected to a rotating shaft 18, which is arranged longitudinally. A moving ring 19 is threadedly connected to the rotating shaft 18, and the moving ring 19 is fixed to the collar 16 through a connecting rod 20.

[0038] The height of the heat collection tube 8 is automatically and precisely adjusted through the lifting assembly. This design utilizes a motor 17 to drive the rotating shaft 18 to rotate, and a threaded transmission causes the moving ring 19 to rise and fall stably in the longitudinal direction. This, in turn, drives the collar 16 and the heat collection tube 8 to move synchronously through the connecting rod 20. Operators can remotely or automatically adjust the depth of the heat collection tube 8 into the crucible 4 through the control system (such as a PLC or touch screen panel), completely eliminating the limitations of manual adjustment and significantly reducing the operational risks and labor intensity in high-temperature environments. The threaded transmission has high-precision positioning characteristics and can dynamically adjust the waste heat introduction position in real time according to the smelting process, ensuring that the heat exchange efficiency between waste heat and materials is maximized. In addition, the fixed connection between the motor 17 and the top surface of the furnace wall 1, the longitudinal coaxial design of the rotating shaft 18, and the rigid connection between the moving ring 19 and the connecting rod 20 form a stable transmission system, avoiding shaking or jamming during the lifting process. This ensures that the heat collection tube 8 maintains reliable performance during long-term high-frequency adjustments, providing key hardware support for the intelligent and digital control of the furnace. While improving energy utilization efficiency, it also significantly enhances the process adaptability and production flexibility of the equipment.

[0039] Any aspects of this utility model that are not detailed herein are conventional technical means known to those skilled in the art.

[0040] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0041] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A furnace capable of utilizing waste heat from combustion, characterized in that, include: A furnace wall (1) is provided, and a cavity (2) is provided inside the furnace wall (1). A crucible (4) is supported in the cavity (2) by a fixed bracket (3). A burner (5) is fixedly connected to the bottom of the cavity (2). The burner (5) is connected to an oxygen pipe (6) and a natural gas pipe (7). The oxygen pipe (6) extends out of the furnace wall (1) and is connected to an external oxygen supply device. The natural gas pipe (7) extends out of the furnace wall (1) and is connected to an external natural gas supply device. The top of the cavity (2) is sealed to the side wall of the crucible (4). A heat collection pipe (8) is connected to the top of the cavity (2). The other end of the heat collection pipe (8) is bent and extends into the crucible (4).

2. The furnace capable of utilizing waste heat from combustion according to claim 1, characterized in that: The crucible (4) has a discharge port (9) at the bottom, and a discharge pipe (10) is connected below the discharge port (9). The discharge pipe (10) extends out of the furnace wall (1) and communicates with the outside. A plunger (11) is provided inside the discharge port (9).

3. The furnace capable of utilizing waste heat from combustion according to claim 2, characterized in that: A connecting rod (12) is fixed to the top of the plunger (11), and the top of the connecting rod (12) extends out of the crucible (4) and is connected to an extension plate (13).

4. The furnace capable of utilizing waste heat from combustion according to claim 3, characterized in that: The extension plate (13) extends horizontally outward at both ends to the top surface of the furnace wall (1). The movable ends of the telescopic rods (14) are fixed at the bottom of both ends of the extension plate (13), and the fixed ends of the telescopic rods (14) are fixed to the top surface of the furnace wall (1).

5. The furnace capable of utilizing waste heat from combustion according to claim 2, characterized in that: The discharge port (9) is a cone shape with a larger top and a smaller bottom, and the plunger (11) is matched with the discharge port (9).

6. The furnace capable of utilizing waste heat from combustion according to claim 1, characterized in that: The bottom of the heat collection tube (8) is slidably connected to a sleeve (15), and a sealing ring is fixedly connected to the joint between the sleeve (15) and the heat collection tube (8). The bottom of the sleeve (15) is fixedly connected to the top surface of the cavity (2).

7. The furnace capable of utilizing waste heat from combustion according to claim 6, characterized in that: A collar (16) is fixedly connected to the bend at the top of the heat collection tube (8), and the movable end of the lifting assembly is fixedly connected to the outside of the collar (16).

8. The furnace capable of utilizing waste heat from combustion according to claim 7, characterized in that: The lifting assembly includes a motor (17), which is fixed to the top surface of the furnace wall (1). The motor (17) is driven by a rotating shaft (18), which is arranged longitudinally. A movable ring (19) is threaded onto the rotating shaft (18), and the movable ring (19) is fixed to the collar (16) through a connecting rod (20).

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