A waste heat utilization device suitable for a continuous positive backfire furnace

Abstract

The utility model discloses a kind of waste heat utilization devices suitable for continuous positive back annealing furnace, including air inlet pipe, first coil assembly, main pipe and second coil assembly;The air inlet pipe includes air inlet;The first coil assembly is at least partially located in cooling chamber, and one end is connected to air inlet pipe, and is communicated with air inlet pipe;The main pipe is connected to the other end of first coil assembly;The second coil assembly is located in the preheating zone of continuous positive back annealing furnace, and is connected to main pipe;Air enters air inlet pipe from air inlet, and when passing through first coil assembly located in cooling chamber, it exchanges heat with hot air in cooling chamber, and then enters second coil assembly through main pipe to preheat workpiece in preheating zone, then blow out from drying chamber, can dry the moisture on the surface of workpiece, improve product quality, realize waste heat utilization in continuous positive back annealing furnace.

Description

Technical Field

[0001] This utility model relates to the field of continuous positive annealing furnace technology, and specifically to a waste heat utilization device suitable for continuous positive annealing furnaces. Background Technology

[0002] A continuous annealing and tempering furnace is a widely used continuous heat treatment equipment in industrial fields, mainly used for heat treatment processes such as normalizing, annealing, and tempering of metals and other materials. This equipment is typically equipped with a forced air cooling chamber, which rapidly and controllably cools the heat-treated workpieces. The cooled workpieces are then discharged through the outlet.

[0003] In the air-cooling process, room-temperature air is drawn into the cooling chamber by a fan system, where it exchanges heat with the high-temperature workpiece and becomes hot air. Currently, the commonly used cooling method is to directly exhaust this heated air into the workshop environment. However, this direct exhaust method has significant drawbacks: Energy waste: Hot air (i.e. waste heat) contains a large amount of recyclable thermal energy. Direct emission means that this part of the energy is completely wasted and not effectively utilized.

[0004] Environmental impact: The release of hot air into the workshop will inevitably lead to a significant increase in the ambient temperature around the continuous positive return furnace, which will worsen the working environment for workers and may increase the energy consumption burden of the workshop's air conditioning system in summer. Utility Model Content

[0005] To solve the above technical problems, this utility model provides a waste heat utilization device suitable for continuous positive annealing furnace. The air from the cooling fan passes through the cooling chamber, which lowers the temperature of the cooling chamber and raises the air temperature. Then it passes through the preheating zone to preheat the temperature of the workpiece. Finally, it is blown out from the drying chamber to dry the surface moisture of the workpiece and preheat the temperature of the workpiece, thereby reducing energy consumption.

[0006] The present invention adopts the following technical solution: A waste heat recovery device suitable for a continuous forward annealing furnace includes an air inlet pipe, a first coil assembly, a main pipe, and a second coil assembly. The air inlet pipe includes an air inlet. The first coil assembly is at least partially located in the cooling chamber and is connected to the air inlet pipe at one end. The main pipe is connected to the other end of the first coil assembly. The second coil assembly is located in the preheating zone of the continuous forward annealing furnace and is connected to the main pipe. After air enters the air inlet pipe from the air inlet, it passes through the first coil assembly located in the cooling chamber and exchanges heat with the hot air in the cooling chamber. Then, it enters the second coil assembly through the main pipe to preheat the workpiece in the preheating zone. The air from the cooling fan passes through the cooling chamber, reducing the cooling chamber temperature and increasing the air temperature, before passing through the preheating zone to preheat the workpiece temperature. This constructs a two-stage waste heat recovery system, reducing additional energy consumption in the preheating zone.

[0007] Preferably, the air inlet is equipped with an air inlet motor, which forces air to be delivered, overcomes pipe resistance, ensures stable airflow, and can dynamically adjust the air volume according to the furnace temperature; it can also maintain a positive pressure environment to prevent backflow of flue gas in the furnace from polluting the air inlet system.

[0008] Preferably, the air inlet duct is provided with at least two first coil assemblies; at least two first coil assemblies are longitudinally distributed in the cooling chamber, and the longitudinal multi-coil layout matches the three-dimensional space of the cooling chamber and can also increase the total heat exchange area.

[0009] Preferably, the first coil assembly and the second coil assembly have a W-shaped structure, which extends the length of the coil, increases the heat exchange time between the air in the first coil assembly and the air in the cooling chamber, and increases the preheating time of the air in the second coil assembly on the workpiece in the preheating zone.

[0010] Preferably, an exhaust pipe is also included, which is connected to the outlet of the second coil assembly, and the air is discharged from the exhaust pipe after preheating the workpiece in the preheating zone.

[0011] Preferably, the exhaust pipe is angled upwards, and the angled upward design utilizes the buoyancy of hot air to reduce the energy consumption of the fan.

[0012] Preferably, the exhaust pipe is located in the feeding and drying chamber of the continuous positive annealing furnace, and the air discharged from the exhaust pipe dries the workpieces in the feeding and drying chamber.

[0013] Preferably, the continuous positive annealing furnace has an in-furnace roller for transporting workpieces, and the exhaust pipe is located below the in-furnace roller and is arranged towards the in-furnace roller to facilitate drying of the workpieces on the in-furnace roller.

[0014] Preferably, the airflow direction within the waste heat utilization device is approximately opposite to the movement direction of the workpiece within the continuous positive annealing furnace.

[0015] Compared with the prior art, the present invention has the following advantages: The present invention provides a waste heat utilization device suitable for a continuous positive annealing furnace, including an air inlet pipe, a first coil assembly, a main pipe, and a second coil assembly. After the air enters the air inlet pipe from the air inlet, it exchanges heat with the hot air in the cooling chamber when it passes through the first coil assembly located in the cooling chamber. Then, it enters the second coil assembly through the main pipe to preheat the workpiece in the preheating zone. The air in the air inlet pipe can not only reduce the temperature of the cooling chamber after passing through the cooling chamber, but also increase the temperature of the air in the first coil assembly. The heated air is used to preheat the workpiece in the preheating zone. Afterward, it is blown out from the drying chamber through the exhaust pipe to dry the surface moisture of the workpiece, preheat the workpiece temperature, and reduce energy consumption. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the waste heat utilization device of this application.

[0017] Figure 2 This is a schematic diagram of the structure of the first coil assembly.

[0018] In the diagram, there are: 1. Air inlet pipe, 1-1. 2. First coil assembly, 3. Main pipe, 4. Second coil assembly, 5. Exhaust pipe, 6. Air inlet motor, 7. Cooling chamber, 8. Preheating zone, and 9. Drying chamber. Detailed Implementation

[0019] To facilitate understanding of the technical solution of this utility model, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments.

[0020] Example 1 like Figure 1-2 As shown, a waste heat utilization device suitable for a continuous positive annealing furnace includes an air inlet pipe 1, a first coil assembly 2, a main pipe 3, and a second coil assembly 4. The air inlet pipe 1 includes an air inlet 1-1. The first coil assembly 2 is at least partially located in the cooling chamber 7, and one end is connected to the air inlet pipe 1 and communicates with the air inlet pipe 1. The main pipe 3 is connected to the other end of the first coil assembly 2. The second coil assembly 4 is located in the preheating zone 8 of the continuous positive annealing furnace and is connected to the main pipe 3. After air enters the air inlet pipe 1 from the air inlet 1-1, it passes through the first coil assembly 2 located in the cooling chamber 7 and exchanges heat with the hot air in the cooling chamber 7. Then, it enters the second coil assembly 4 through the main pipe 3 to preheat the workpiece in the preheating zone 8. The air from the cooling fan passes through the cooling chamber 7, lowering the temperature of the cooling chamber 7 and raising the air temperature. Then, it passes through the preheating zone 8 to preheat the workpiece temperature, reducing the additional energy consumption in the preheating zone.

[0021] The air inlet 1-1 is equipped with an air inlet motor 6, which forces air to be delivered, overcomes pipe resistance, ensures stable airflow, and can dynamically adjust the air volume according to the furnace temperature.

[0022] The air inlet duct 1 is equipped with two first coil assemblies 2; the two first coil assemblies 2 are longitudinally distributed in the cooling chamber 7, and the longitudinal multi-coil layout matches the three-dimensional space of the cooling chamber and can also increase the total heat exchange area.

[0023] The first coil assembly 2 and the second coil assembly 4 have a W-shaped structure, which extends the length of the coil and increases the heat exchange time between the air in the first coil assembly and the air in the cooling chamber, as well as the preheating time of the air in the second coil assembly on the workpiece in the preheating zone.

[0024] It also includes an exhaust pipe 5 connected to the outlet of the second coil assembly 4. Air preheats the workpiece in the preheating zone 8 and is then discharged from the exhaust pipe 5. The exhaust pipe 5 is angled upward, and this angled upward design utilizes the buoyancy of the hot air to reduce the energy consumption of the fan.

[0025] The exhaust pipe 5 is located in the feeding and drying chamber 9 of the continuous positive annealing furnace, and the air discharged from the exhaust pipe 5 dries the workpieces in the feeding and drying chamber 9.

[0026] In summary, this application constructs a three-stage waste heat recovery system; First stage (cooling chamber): The waste heat emitted by the hot air in the cooling chamber is used to preheat the air in the first coil assembly (cold air → high temperature air). Second stage (preheating zone): The air after heat exchange in the cooling chamber is used for the initial heating of the workpiece (high temperature air → medium temperature air). The third stage (drying chamber): The medium-temperature air used after preheating the workpiece in the preheating zone is used to dry the surface moisture of the workpiece (medium-temperature air → low-temperature air).

[0027] The continuous positive annealing furnace has an inner roller for transporting workpieces. The exhaust pipe 5 is located below the inner roller and is oriented towards the inner roller to facilitate drying of the workpieces on the inner roller.

[0028] Among them, the "front, back, left, right, up, down" perspectives of this device are... Figure 1 The direction shown in the diagram is the reference. In this embodiment, the continuous positive annealing and tempering furnace is an abbreviation for continuous normalizing furnace, continuous annealing furnace, and continuous tempering furnace. The continuous positive annealing and tempering furnace includes a feeding platform on the right side, with feeding platform rollers on the feeding platform. The furnace body is equipped with several furnace rollers for moving workpieces. The air flow direction in the waste heat utilization device is roughly opposite to the movement direction of the workpieces in the continuous positive annealing and tempering furnace, that is, the movement direction of the workpieces is from right to left, and the movement direction of the combustion air is generally from left to right (there is up-and-down or back-and-forth movement in the air inlet pipe, coil, and main pipe).

[0029] The above are merely preferred embodiments of this utility model. The scope of protection of this utility model is defined by the scope of the claims. Any improvements and modifications made by those skilled in the art without departing from the spirit and scope of this utility model should also be considered as protection within the scope of this utility model.

Claims

1. A waste heat utilization device suitable for a continuous positive annealing furnace, characterized in that, It includes an air inlet pipe (1), a first coil assembly (2), a main pipe (3), and a second coil assembly (4); the air inlet pipe (1) includes an air inlet (1-1); the first coil assembly (2) is at least partially located in the cooling chamber (7), and one end is connected to the air inlet pipe (1) and communicates with the air inlet pipe (1); the main pipe (3) is connected to the other end of the first coil assembly (2); the second coil assembly (4) is located in the preheating zone (8) of the continuous positive annealing furnace and is connected to the main pipe (3); after the air enters the air inlet pipe (1) from the air inlet (1-1), it passes through the first coil assembly (2) located in the cooling chamber (7) and exchanges heat with the hot air in the cooling chamber (7), and then enters the second coil assembly (4) through the main pipe (3) to preheat the workpiece in the preheating zone (8).

2. The waste heat utilization device for a continuous positive annealing furnace according to claim 1, characterized in that, An air inlet motor (6) is provided on the air inlet (1-1).

3. The waste heat utilization device for a continuous positive annealing furnace according to claim 1, characterized in that, At least two first coil assemblies (2) are provided on the air inlet pipe (1); at least two first coil assemblies (2) are longitudinally distributed in the cooling chamber (7).

4. The waste heat utilization device for a continuous positive annealing furnace according to claim 1, characterized in that, The first coil assembly (2) and the second coil assembly (4) are W-shaped structures.

5. The waste heat utilization device for a continuous positive annealing furnace according to claim 1, characterized in that, It also includes an exhaust pipe (5) connected to the outlet of the second coil assembly (4), from which air is discharged after preheating the workpiece in the preheating zone (8).

6. The waste heat utilization device for a continuous positive annealing furnace according to claim 5, characterized in that, The exhaust pipe (5) is set at an angle upward.

7. The waste heat utilization device for a continuous positive annealing furnace according to claim 5, characterized in that, The exhaust pipe (5) is located in the feeding drying chamber (9) of the continuous positive annealing furnace, and the air discharged from the exhaust pipe (5) dries the workpieces in the feeding drying chamber (9).

8. The waste heat utilization device for a continuous positive annealing furnace according to claim 7, characterized in that, The continuous positive annealing furnace has an in-furnace roller for transporting workpieces, and the exhaust pipe (5) is located below the in-furnace roller and is oriented toward the in-furnace roller.

9. The waste heat utilization device for a continuous positive annealing furnace according to claim 1, characterized in that, The airflow direction within the waste heat recovery device is roughly opposite to the movement direction of the workpiece within the continuous forward annealing furnace.

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