Drying device for recycling waste heat of steel wire heat treatment furnace

Abstract

The utility model provides a drying device for recycling waste heat of a steel wire heat treatment furnace, and relates to the technical field of steel wire drying devices. Comprising a hollow drying box, a plurality of steel wires horizontally and dynamically penetrate through the interior of the drying box, a hot air pipeline is arranged above the drying box, the input end of the hot air pipeline is communicated with an exhaust port of a steel wire heat treatment furnace, and the output end of the hot air pipeline is communicated with the interior of the drying box; the output end of the hot air pipeline is communicated with an air guide bin with a hollow interior and an open bottom; the air guide bin is arranged on the upper surface of the drying box in an inclined state, and the air guide bin communicates with the interior of the drying box through an air inlet formed in the upper surface of the drying box; the air guide bin is configured to conduct diffusion and inclined guiding on hot air, and the inclined guiding direction is opposite to the moving direction of the steel wire. On the basis, the problems that in the prior art, waste heat of the steel wire heat treatment furnace is not recycled to the drying process, and then energy waste and extra cost consumption are caused are solved.

Description

Technical Field

[0001] This utility model relates to the technical field of steel wire drying devices, specifically a drying device that recovers and utilizes the waste heat of a steel wire heat treatment furnace. Background Technology

[0002] Steel wire, with its high strength, wear resistance, and corrosion resistance, is widely used in construction, bridges, mining, shipbuilding, and machinery manufacturing. Key processes in steel wire production include heat treatment, washing, and drying. In the heat treatment process, the steel wire is heated using equipment such as muffle furnaces or lead bath furnaces to improve its microstructure, eliminate internal stress, or impart specific properties; during this process, the heat treatment furnace continuously produces a large amount of high-temperature hot gas. In the washing process, the surface of the steel wire is rinsed with hot or room-temperature water to remove oxide scale generated during heat treatment, as well as residual impurities or acid / alkali solutions from other processes. In the drying process, the moisture on the surface of the washed steel wire is evaporated using drying boxes or furnaces heated by fuel or electricity to ensure the quality of subsequent processes (such as plating and drawing). Of the above production processes, the drying process requires additional fuel or electricity for heating; therefore, if the waste heat from the heat treatment furnace can be recovered for drying, the company's energy consumption can be significantly reduced.

[0003] However, in the existing technology in this field, due to a lack of awareness of energy recovery and utilization and in order to save time and effort, a large amount of hot gas generated by the heat treatment furnace is usually directly discharged, which will result in serious energy waste. Although a few manufacturers collect the waste heat of the heat treatment furnace, most of them use the waste heat for steam power generation or hot water preheating (such as through steam generators and hot water collection pipes), without fully combining it with the process requirements of steel wire drying, resulting in the waste heat resources not being used efficiently. Utility Model Content

[0004] The purpose of this utility model is to provide a drying device for recovering and utilizing the waste heat of a steel wire heat treatment furnace, so as to solve the problem mentioned in the background art that the existing technology does not recover and utilize the waste heat of the steel wire heat treatment furnace to the drying process, thereby causing energy waste and additional cost consumption.

[0005] This utility model is achieved using the following technical solution:

[0006] A drying device for recovering waste heat from a steel wire heat treatment furnace includes a hollow drying chamber. Several steel wires pass horizontally and dynamically through the interior of the drying chamber. A hot air pipe is provided above the drying chamber. The inlet end of the hot air pipe is connected to the exhaust port of the steel wire heat treatment furnace, and the outlet end is connected to the interior of the drying chamber. A hollow, open-bottomed air guide chamber is connected to the outlet end of the hot air pipe. The air guide chamber is arranged at an inclination on the upper surface of the drying chamber and is connected to the interior of the drying chamber through an air inlet on the upper surface of the drying chamber. The air guide chamber is configured to disperse and guide the hot air at an inclination, and the direction of the inclination is opposite to the direction of movement of the steel wires.

[0007] In the drying device provided by this utility model, the hot air entering the drying chamber comes from the waste heat discharged from the steel wire heat treatment furnace. This enables efficient utilization of the waste heat from the heat treatment furnace, avoids energy waste, and saves on the cost of additional energy used in the drying process. Specifically, by setting up an air guide chamber, oblique counter-current air intake is achieved. As a result, the hot air (hot fluid) and the steel wire (cold fluid) flow counter-currently, significantly increasing the heat exchange temperature difference (compared to co-current or vertical air intake), resulting in higher heat transfer efficiency. Furthermore, this oblique counter-current airflow path is longer, allowing the hot air to remain in the drying chamber for a longer time, thus providing more time for the waste heat to be transferred to the steel wire.

[0008] Furthermore, both ends of the drying box are open, namely the wire entry end and the wire exit end; the wire entry end and the wire exit end are provided with baffles, and the baffles are provided with toothed structures to avoid several wires.

[0009] In the above structure, the baffle is used to reduce heat dissipation inside the drying chamber to achieve a better drying effect; when the steel wire passes through the drying chamber, it can pass through the gaps in the toothed structure. In practical applications, the steel wire can be driven by an external (i.e., not located inside the drying chamber) conveying mechanism to achieve the effect of dynamically passing through the interior of the drying chamber; the specific structure of this external conveying mechanism is existing technology in the field, such as a grooving traction wheel and a pressure roller, etc., which can be adapted by those skilled in the art according to the situation, and therefore will not be described in detail in this utility model.

[0010] Furthermore, the drying chamber is provided with a turbulence-disrupting component for disturbing the flow of hot air, the turbulence-disrupting component including a rod-shaped structure or a corrugated plate-shaped structure.

[0011] In the above structure, the turbulence component can disturb the flow of hot air through its own structure (rod-shaped structure or plate-shaped undulating structure), thereby enhancing the convective heat transfer between hot air and steel wire, and thus improving the drying effect and waste heat utilization rate.

[0012] Furthermore, the turbulence-disrupting component includes several metal rods, which are horizontally installed and spaced apart at the bottom of the drying chamber; the length extension direction of the metal rods is perpendicular to the movement direction of the steel wire, and the metal rods are positioned below the steel wire.

[0013] In the above structure, several metal rods can act as disturbance sources, creating flow disturbances around the hot air entering the drying chamber, disrupting the laminar boundary layer that is easily generated when the hot air flows, causing the hot air to be divided into multiple streams, forming a turbulent region around the metal rods, which in turn allows the hot air to come into contact with the steel wire surface more frequently, thereby enhancing convective heat transfer.

[0014] Furthermore, the turbulence-disrupting component includes a periodically undulating corrugated metal plate, which is horizontally installed at the bottom of the drying chamber; the undulating extension direction of the corrugated metal plate is parallel to the movement direction of the steel wire, and the corrugated metal plate is positioned below the steel wire.

[0015] In the above structure, the wavy metal plate that undulates periodically along the direction of the steel wire movement can create continuous and large-scale disturbances to the hot air. This causes the hot air to generate more complex flow patterns such as lifting and eddies at the crests and troughs of the wavy metal plate. Compared with the single-point disturbance of the metal rod, it is easier to make the hot air enter a turbulent state over a large area. At the same time, the wavy tortuous channel can prolong the residence time of the hot air in the drying chamber, allowing the hot air to exchange heat with the steel wire more fully, thereby further enhancing convective heat transfer.

[0016] Furthermore, the turbulence-causing component includes an upper wavy metal plate and a lower wavy metal plate that undulate periodically; the undulation extension directions of the upper and lower wavy metal plates are parallel to the movement direction of the steel wire, and the upper and lower wavy metal plates undulate relative to each other in the vertical direction; the steel wire is located between the upper and lower wavy metal plates.

[0017] In the above structure, the undulating upper and lower corrugated metal plates form a periodically contracting and expanding airflow channel. The hot air will generate stronger turbulence in this channel due to the repeated changes in the cross-section, which will greatly improve the convective heat transfer efficiency between the hot air and the steel wire surface. At the same time, the upper and lower corrugated structures make the flow path of the hot air in the drying chamber more complex, which can prolong the contact time between the hot air and the steel wire, allowing the heat transfer to be more complete.

[0018] Furthermore, the upper corrugated metal plate is provided with an avoidance opening, and each end of the avoidance opening is provided with an inclined air guide plate. One end of the two inclined air guide plates is connected to / abuts / approaches the top surface of the drying box, and the other end is connected to the upper corrugated metal plate. The inclination angle of the two inclined air guide plates is adapted to the inclination angle of the air guide chamber.

[0019] In the above structure, the upper corrugated metal plate is used to avoid obstructing the entry of hot air by setting an avoidance opening, while the inclined air guide plate is used to smoothly guide the hot air to the area between the upper and lower corrugated metal plates.

[0020] Furthermore, the barrier is made of silicone rubber.

[0021] In the above structure, the silicone rubber material has the characteristics of high temperature resistance, good sealing performance and aging resistance, which can effectively prevent heat leakage and is suitable for long-term application in the steel wire drying scenario.

[0022] The beneficial effects achieved by this utility model are:

[0023] A drying device for recovering waste heat from a steel wire heat treatment furnace is provided. By incorporating hot air pipes, a gas guide chamber, and a drying box, the waste heat from the furnace can be recovered and reused in the drying process. The gas guide chamber enables oblique counter-current air intake, thereby improving heat transfer efficiency and effectiveness. Therefore, compared with existing technologies, this invention achieves highly efficient utilization of waste heat from the heat treatment furnace, effectively avoiding energy waste and saving on the cost of additional energy used in the drying process. Attached Figure Description

[0024] Figure 1 This is an external perspective view of the drying device described in Embodiment 1 of this utility model;

[0025] Figure 2 This is a schematic internal cross-sectional view of the drying device described in Embodiment 1 of this utility model;

[0026] Figure 3 This is a schematic internal cross-sectional view of the drying device described in Embodiment 2 of this utility model;

[0027] Figure 4 This is a schematic internal cross-sectional view of the drying device described in Embodiment 3 of this utility model;

[0028] In the diagram: 1. Drying oven; 2. Air chamber; 3. Hot air pipe; 4. Steel wire exit end; 5. Baffle; 6. Steel wire entry end; 7. Air inlet; 8. Steel wire; 9. Metal rod; 10. Corrugated metal plate; 11. Lower corrugated metal plate; 12. Upper corrugated metal plate; 13. Clearance opening; 14. Inclined air guide plate. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0030] Example 1

[0031] This embodiment provides a drying device for recovering waste heat from a steel wire heat treatment furnace. Please refer to [reference needed]. Figures 1 to 2 The drying chamber includes a hollow rectangular drying box 1, through which several steel wires 8 are driven horizontally and dynamically by an external conveying mechanism. A hot air pipe 3 is located above the drying box 1; the inlet of the hot air pipe 3 is connected to the exhaust port (not shown in the figure) of the steel wire heat treatment furnace, and the outlet is connected to the interior of the drying box 1. Specifically:

[0032] The drying chamber 1 is open at both ends, which are the wire inlet end 6 and the wire outlet end 4, respectively. Both the wire inlet end 6 and the wire outlet end 4 are equipped with rectangular baffles 5 made of silicone rubber. The lower edge of the baffles 5 is provided with a toothed structure to avoid several wires 8.

[0033] The output end of the hot air pipe 3 is connected to a hollow, open-bottom air guide chamber 2. In this embodiment, the air guide chamber 2 is trapezoidal. The air guide chamber 2 is arranged at an incline on the upper surface of the drying box 1, and the air guide chamber 2 is connected to the interior of the drying box 1 through the air inlet 7 opened on the upper surface of the drying box 1. The air guide chamber 2 is configured to disperse and guide the hot air at an incline, and the direction of the incline is opposite to the direction of movement of the steel wire 8.

[0034] The drying chamber 1 is equipped with a turbulence-disrupting component for disturbing the flow of hot air. In this embodiment, the turbulence-disrupting component includes several metal rods 9 (specifically made of stainless steel). The several metal rods 9 are horizontally installed and spaced apart at the bottom position inside the drying chamber 1. The length extension direction of the metal rods 9 is perpendicular to the movement direction of the steel wire 8, and the metal rods 9 are located below the steel wire 8.

[0035] During production, the waste heat gas discharged from the steel wire heat treatment furnace will reach the air guide chamber 2 through the hot gas pipe 3. Then, under the divergent guiding effect of the air guide chamber 2, it will flow obliquely and counter-currently into the drying chamber 1. When the hot gas encounters the metal rod 9 inside the drying chamber 1, it will flow around it and then be divided into multiple streams, forming a turbulent area around the metal rod 9. In the turbulent state, the hot gas micro-particles are violently mixed and can fully contact the horizontally moving steel wire 8, so that the heat can be quickly transferred to the surface of the steel wire 8, thereby achieving the drying of the steel wire 8.

[0036] Example 2

[0037] This embodiment provides a drying device for recovering waste heat from a steel wire heat treatment furnace. Please refer to [reference needed]. Figure 3 The difference from Example 1 is as follows:

[0038] The turbulence-disrupting component includes a periodically undulating corrugated metal plate 10 (specifically made of stainless steel), which is horizontally installed at the bottom of the drying chamber 1; the undulating extension direction of the corrugated metal plate 10 is parallel to the movement direction of the steel wire 8, and the corrugated metal plate 10 is positioned below the steel wire 8.

[0039] When the above structure is applied, the hot air enters the drying chamber 1 in a counter-current direction and flows along the undulating trajectory of the corrugated metal plate 10. During the flow, it is constantly disturbed by the undulating structure, thus forming a large-scale and continuous turbulence, which makes the convective heat transfer efficiency higher. At the same time, the corrugated tortuous path prolongs the residence time of the hot air in the drying chamber 1, allowing the residual heat to have more time to exchange heat with the steel wire 8.

[0040] Example 3

[0041] This embodiment provides a drying device for recovering waste heat from a steel wire heat treatment furnace. Please refer to [reference needed]. Figure 4 The difference from Example 1 is as follows:

[0042] The turbulence-inducing component includes an upper corrugated metal plate 12 and a lower corrugated metal plate 11 with periodic undulations, and a steel wire 8 is located between the upper corrugated metal plate 12 and the lower corrugated metal plate 11; the undulation extension directions of the upper corrugated metal plate 12 and the lower corrugated metal plate 11 are parallel to the movement direction of the steel wire 8, and the upper corrugated metal plate 12 and the lower corrugated metal plate 11 undulate relative to each other in the vertical direction.

[0043] An avoidance opening 13 is provided on the upper corrugated metal plate 12. An inclined air guide plate 14 is provided at each end of the avoidance opening 13. One end of the two inclined air guide plates 14 abuts (or connects to / approaches) the top surface of the drying box 1, and the other end is connected to the upper corrugated metal plate 12. The inclination angle of the two inclined air guide plates 14 is adapted to the inclination angle of the air guide chamber 2.

[0044] When the above structure is applied, the inclined air guide plate 14 can smoothly guide the hot air in the air guide chamber 2 to the area between the upper corrugated metal plate 12 and the lower corrugated metal plate 11. The undulating upper corrugated metal plate 12 and the lower corrugated metal plate 11 form a periodically contracting and expanding airflow channel. After the hot air enters obliquely in the opposite direction, it will generate strong turbulence in the channel, which will greatly improve the convective heat transfer efficiency between the hot air and the surface of the steel wire 8. At the same time, the upper and lower corrugated structure makes the flow path of the hot air in the drying chamber 1 more complex, which can prolong the contact time between the hot air and the steel wire 8 and make the heat transfer more complete.

[0045] It should be specifically noted that the parts not described in detail or elaborated in the above solutions are all prior art and do not constitute improvements made by this utility model to existing technology, nor are they within the protection scope of this utility model's technical solutions. Therefore, they will not be elaborated upon further in this document. Of course, the above content is only a preferred embodiment of this utility model and should not be considered as limiting the scope of the embodiments of this utility model. This utility model is also not limited to the above examples. Equivalent changes and improvements made by those skilled in the art within the substantial scope of this utility model should all fall within the patent coverage of this utility model.

Claims

1. A drying device for recovering waste heat from a steel wire heat treatment furnace, comprising a hollow drying chamber (1), wherein several steel wires (8) pass horizontally and dynamically through the interior of the drying chamber (1), characterized in that: A hot air pipe (3) is provided above the drying box (1). The input end of the hot air pipe (3) is connected to the exhaust port of the steel wire heat treatment furnace, and the output end is connected to the interior of the drying box (1). The hot air pipe (3) has a hollow, open-bottom air guide chamber (2) connected to its output end. The air guide chamber (2) is arranged on the upper surface of the drying box (1) in an inclined state, and the air guide chamber (2) is connected to the interior of the drying box (1) through an air inlet (7) opened on the upper surface of the drying box (1). The air guide chamber (2) is configured to disperse and guide the hot air at an inclination, and the direction of the inclination is opposite to the direction of movement of the steel wire (8).

2. The drying device for recovering waste heat from a steel wire heat treatment furnace according to claim 1, characterized in that: The drying box (1) is open at both ends, which are the wire entry end (6) and the wire exit end (4), respectively. The wire entry end (6) and the wire exit end (4) are provided with baffles (5), and the baffles (5) are provided with toothed structures to avoid several wires (8).

3. The drying device for recovering waste heat from a steel wire heat treatment furnace according to claim 1, characterized in that: The drying oven (1) is equipped with a turbulence-disrupting component for disturbing the flow of hot air. The turbulence-disrupting component includes a rod-shaped structure or a corrugated plate-shaped structure.

4. The drying device for recovering waste heat from a steel wire heat treatment furnace according to claim 3, characterized in that: The turbulence-disrupting component includes several metal rods (9), which are horizontally installed and spaced apart at the bottom of the drying box (1); the length extension direction of the metal rods (9) is perpendicular to the movement direction of the steel wire (8), and the metal rods (9) are located below the steel wire (8).

5. The drying device for recovering waste heat from a steel wire heat treatment furnace according to claim 3, characterized in that: The turbulence-disrupting component includes a periodically undulating corrugated metal plate (10), which is horizontally installed at the bottom of the drying box (1); the undulating extension direction of the corrugated metal plate (10) is parallel to the movement direction of the steel wire (8), and the corrugated metal plate (10) is located below the steel wire (8).

6. The drying device for recovering waste heat from a steel wire heat treatment furnace according to claim 3, characterized in that: The turbulence-causing component includes an upper wavy metal plate (12) and a lower wavy metal plate (11) that undulate periodically; the undulation extension directions of the upper wavy metal plate (12) and the lower wavy metal plate (11) are parallel to the movement direction of the steel wire (8), and the upper wavy metal plate (12) and the lower wavy metal plate (11) undulate relative to each other in the vertical direction; the steel wire (8) is located between the upper wavy metal plate (12) and the lower wavy metal plate (11).

7. The drying device for recovering waste heat from a steel wire heat treatment furnace according to claim 6, characterized in that: The upper corrugated metal plate (12) is provided with an avoidance opening (13), and each end of the avoidance opening (13) is provided with an inclined air guide plate (14). One end of the two inclined air guide plates (14) is connected to / abuts / approaches the top surface of the drying box (1), and the other end is connected to the upper corrugated metal plate (12). The inclination angle of the two inclined air guide plates (14) is adapted to the inclination angle of the air guide chamber (2).

8. The drying device for recovering waste heat from a steel wire heat treatment furnace according to claim 2, characterized in that: The barrier (5) is made of silicone rubber.

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