Heating furnace and continuous paint removing method of waste enameled wire using same

Abstract

The invention relates to a heating furnace. A furnace body is provided with a feeding area, a preheating area, a heating area and a cooling discharging area which are sequentially communicated. The feeding area is provided with a feeding furnace door and a feeding water tank; the depth of water filled in the feeding water tank at least submerges the material and the bottom of the feeding furnace door; the preheating area is provided with a first atmosphere adjusting device; the heating area is provided with a second atmosphere adjusting device; the cooling and discharging area is provided with a discharging furnace door and a discharging water tank; and the depth of water filled in the discharging water tank at least submerges the materials and the bottom of the discharging furnace door. According to the continuous depainting method for the heating furnace and the waste enameled wire, external air is effectively isolated through the feeding water tank and the discharging water tank, it is ensured that the pyrolysis process is conducted in an oxygen-free or low-oxygen environment through the atmosphere adjusting device, oxidation loss of the copper wire is avoided, it is ensured that the surface of a depainting material is bright, and the depainting yield is larger than 99%.

Description

Technical Field

[0001] The invention relates to the technical field of recycling and utilizing renewable resources, and in particular to a heating furnace and a method for continuously stripping paint of waste enameled wires using the heating furnace. Background Art

[0002] With the rapid development of new energy vehicles and various household appliances, the output of enameled wire in my country has increased year by year, and is expected to be close to 2 million tons in 2024. Enameled wire is widely used in these fields, and the amount of waste enameled wire has increased accordingly. Its recycling has become an inevitable trend under environmental protection policies and market demand. The key to recycling waste enameled wire is to remove the paint film on the surface of the enameled wire.

[0003] Traditional paint stripping methods, such as mechanical paint scraping and solvent paint stripping, have problems such as large environmental pollution and low efficiency, and are difficult to meet the needs of large-scale production. Although a patent has proposed a continuous pyrolysis method, waste enameled wire often exists in the form of bundles, resulting in incomplete gas exhaust in the preheating section, which may cause internal oxidation and copper loss, or require a long time to remove the air inside the block. The cooling section also has the problem of slow cooling speed.

[0004] In addition, due to the high energy consumption and labor intensity of intermittent pyrolysis, it is gradually replaced by continuous pyrolysis recovery method, which can improve energy utilization, shorten production cycle, reduce costs, and reduce environmental pollution. The continuous pyrolysis method treats exhaust gas through an environmentally friendly exhaust gas purification system to eliminate harmful substances and meet national emission standards.

[0005] Although continuous pyrolysis has many advantages, there are still challenges in actual operation. For example, during the pyrolysis process of waste enameled wire, due to the small internal gaps, the pyrolysis efficiency is slow, the rubber and waste paint on the surface slowly melt and evaporate, and accumulate in the internal gaps for a long time, affecting the paint removal effect.

[0006] Therefore, finding a continuous paint stripping method for waste enameled wire to overcome the shortcomings of the prior art has important practical significance and market value. Summary of the invention

[0007] The object of the present invention is to provide a heating furnace and a method for continuously depainting waste enameled wires using the heating furnace in view of the deficiencies in the prior art.

[0008] To achieve the above object, the technical solution adopted by the present invention is:

[0009] The first aspect of the present invention is to provide a heating furnace, comprising: a furnace body, and a roller for conveying materials through the furnace body; the furnace body has a feeding area, a preheating area, a heating area, and a cooling and discharging area which are sequentially connected and arranged; wherein:

[0010] The feeding area is provided with a feeding furnace door and a feeding water pool; the feeding furnace door divides the feeding area into an external feeding area and an internal feeding area, and the internal feeding area is connected with the preheating area; the feeding furnace door is located in the feeding water pool, and the depth of the water filled in the feeding water pool at least covers the bottom of the material and the feeding furnace door, so that the material does not contact the air at all when passing through the feeding furnace door;

[0011] The preheating zone is provided with a first atmosphere adjustment device to adjust the oxygen content in the preheating zone to a first preset oxygen content;

[0012] The heating zone is provided with a second atmosphere adjustment device to adjust the oxygen content in the heating zone to a second preset oxygen content;

[0013] The cooling and discharging area is provided with a discharging furnace door and a discharging water pool; the discharging furnace door divides the cooling and discharging area into an internal cooling and discharging area and an external cooling and discharging area, and the heating area is connected to the internal cooling and discharging area; the discharging furnace door is located in the discharging water pool, and the depth of water filled in the discharging water pool at least covers the material and the bottom of the discharging furnace door, so that the material does not contact the air at all when passing through the discharging furnace door.

[0014] To ensure that the internal air of the waste enameled wire is completely discharged, the depth of the water filled in the feed water pool is at least above the material; in some preferred embodiments, the depth of the water filled in the feed water pool is at least 1 cm above the material. At the same time, in order to maintain the stability of the internal environment of the furnace body, the depth of the water filled in the feed water pool is at least above the bottom of the feed furnace door to ensure the sealing of the furnace door, prevent the leakage of gas in the furnace, and also avoid the entry of outside air, ensuring the control of the atmosphere in the furnace; in some preferred embodiments, the depth of the water filled in the feed water pool is at least 1 cm above the bottom of the feed furnace door.

[0015] To ensure that the waste enameled wire is completely free from contact with the air and to ensure that the waste enameled wire and the water in the discharge pool are fully heat exchanged, the depth of the water in the discharge pool is at least above the material; in some preferred embodiments, the depth of the water in the discharge pool is at least 2 cm above the material. At the same time, in order to maintain the stability of the internal environment of the furnace body, the depth of the water in the discharge pool is at least above the bottom of the discharge furnace door to ensure the sealing of the furnace door, prevent the leakage of gas in the furnace, and also avoid the entry of outside air, ensuring the control of the atmosphere in the furnace; in some preferred embodiments, the depth of the water in the discharge pool is at least 1 cm above the bottom of the discharge furnace door.

[0016] Preferably, the heating furnace is a natural gas heating furnace.

[0017] Preferably, the feed water pool has a feed down slope and a feed up slope, the feed down slope has a first angle with the horizontal direction, the feed up slope has a second angle with the horizontal direction, and the first angle and the second angle satisfy that the time for the material to pass through the feed water pool is a first preset time.

[0018] Preferably, the first angle is 15°-30°.

[0019] Preferably, the second angle is 15°-30°.

[0020] In order to ensure the stability of the material on the slope and the travel efficiency from entering the water to exiting the water and entering the heating zone, the first angle and the second angle are 15°-30°. This can prevent the material from sliding down the slope due to the steep slope, and at the same time avoid the long journey caused by the gentle slope, which affects the paint stripping efficiency.

[0021] Preferably, the first preset time length is 5 minutes to 60 minutes.

[0022] Furthermore, the first preset time includes: the time it takes for the material to enter the feed pool, the time it takes for the material to pass through the feed pool, and the time it takes for the material to leave the feed pool; wherein,

[0023] The time for the material to pass through the feed pool should be greater than 1 minute to ensure that the internal air of the waste enameled wire is completely discharged to avoid the loss of copper wire due to oxidation during the subsequent continuous pyrolysis process;

[0024] The time for the material to leave the feed water pool should be greater than 5 minutes to ensure that the water carried by the material can be fully separated and returned to the feed water pool, creating good conditions for the subsequent paint stripping process.

[0025] Preferably, the cooling and discharging zone is further provided with a third atmosphere adjusting device to adjust the oxygen content in the cooling and discharging zone to a third preset oxygen content.

[0026] Preferably, the first preset oxygen content is 1.5%-2.5%.

[0027] In the preheating zone, a 1.5%-2.5% micro-oxidation atmosphere is used to promote the decomposition and combustion of the surface film of the waste enameled wire. Since the surface paint film of the waste enameled wire is mainly composed of organic matter, it begins to decompose at about 200°C. The micro-oxidation environment is conducive to the decomposition and combustion of the surface paint film of the waste enameled wire, while avoiding the problem of copper wire oxidation that may be caused by an oxygen-rich environment.

[0028] Preferably, the second preset oxygen content is 0.7%-1.2%.

[0029] When the waste enameled wire enters the heating zone, the surface paint film of the waste enameled wire is heated, the temperature rises, causing the surface to carbonize and crack. At this stage, the 0.7%-1.2% micro-oxidation atmosphere can prevent the copper wire from oxidizing, ensuring the surface brightness and quality of the paint removal product.

[0030] Preferably, the third preset oxygen content is 0.7%-1.2%.

[0031] Likewise, the 0.7%-1.2% micro-oxidation atmosphere in the cooling discharge zone can prevent oxidation of the copper wire and ensure the surface brightness and quality of the depainting product.

[0032] Preferably, the discharge pool has a discharge downward slope and a discharge upward slope, the discharge downward slope has a third angle with the horizontal direction, the discharge upward slope has a fourth angle with the horizontal direction, and the third angle and the fourth angle satisfy that the time length for the material to pass through the discharge pool is a second preset time length.

[0033] Preferably, the third angle is 15°-30°.

[0034] Preferably, the fourth angle is 15°-30°.

[0035] Similarly, in order to ensure the stability of the material on the slope and the travel efficiency from entering the water to exiting the water, the third angle and the fourth angle are 15°-30°, so that the material will not slide down the slope due to the steep slope, and at the same time avoid the long journey caused by the gentle slope, which affects the paint stripping efficiency.

[0036] Preferably, the second preset time length is 10 minutes to 40 minutes.

[0037] Furthermore, the second preset time includes: the time it takes for the material to enter the discharge pool, the time it takes for the material to pass through the discharge pool, and the time it takes for the material to leave the discharge pool; wherein,

[0038] The time for the material to pass through the discharge pool should be greater than 5 minutes to ensure that the carbonized paint film on the surface of the waste enameled wire is completely detached in the cooling and discharging area, and at the same time, the waste enameled wire and the water filled in the discharge pool are fully heat exchanged;

[0039] The time it takes for the material to leave the discharge pool should be greater than 5 minutes to ensure that the water carried by the material can be fully separated and returned to the discharge pool.

[0040] A second aspect of the present invention is to provide a method for continuously depainting waste enameled wires, using the heating furnace as described above, the steps comprising:

[0041] The waste enameled wire passes through the feeding area, the preheating area, the heating area, and the cooling and discharging area of ​​the furnace body in sequence through the roller conveyor; wherein,

[0042] The waste enameled wire is placed in the feed water pool in the feed zone, and the internal air of the waste enameled wire is completely squeezed out by the water filled in the feed water pool;

[0043] The surface paint film of the waste enameled wire is completely carbonized in the heating zone;

[0044] The waste enameled wire is cooled in the cooling and discharging zone while maintaining a certain temperature, and the carbonized paint film on the surface of the waste enameled wire falls off in the cooling and discharging zone;

[0045] After the waste enameled wire leaves the cooling and discharging zone, the waste enameled wire dries the water on its surface brought out by passing through the discharging water pool at its maintained temperature.

[0046] Preferably, the temperature of the heating zone is 550° C.-750° C., and the time for the waste enameled wire to pass through the heating zone is 5 min-60 min, so that the surface paint film of the waste enameled wire is completely carbonized in the heating zone.

[0047] Preferably, the temperature of the water filled in the discharge water pool is 60° C.-80° C., so that the waste enameled wire is cooled in the cooling discharge zone but maintains a certain temperature.

[0048] The present invention adopts the above technical solution, and has the following technical effects compared with the prior art:

[0049] The heating furnace and the continuous paint stripping method for waste enameled wire of the present invention effectively isolate the outside air through the feeding water pool and the discharging water pool, and ensure that the pyrolysis process is carried out in an oxygen-free or low-oxygen environment through the atmosphere adjustment device, thereby avoiding the oxidation loss of the copper wire, ensuring the surface brightness of the paint stripping material, and the paint stripping yield is greater than 99%. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 and Figure 2 Schematic diagram of the structure of the heating furnace in Example 1 of the present invention; wherein,

[0051] Figure 1 It is a schematic diagram of the structure from the feeding zone 11 to the heating zone 13 in the furnace body of the heating furnace; Figure 2 It is a schematic diagram of the structure from the heating zone 13 to the cooling and discharging zone 14 in the furnace body of the heating furnace;

[0052] The reference numerals include:

[0053] Furnace body 1; first atmosphere adjusting device 101; second atmosphere adjusting device 102; third atmosphere adjusting device 103; feeding area 11; feeding furnace door 110; feeding down slope 111; feeding water pool 112; feeding up slope 113; preheating area 12; heating area 13; cooling and discharging area 14; discharging furnace door 140; discharging down slope 141; discharging water pool 142; discharging up slope 143; first angle α1; second angle α2; third angle β1; fourth angle β2. DETAILED DESCRIPTION

[0054] The specific embodiments of the present invention will be described in detail below.

[0055] Unless otherwise defined, technical or scientific terms used in the claims and the specification shall have the common meanings understood by persons having ordinary skills in the technical field to which the present invention belongs.

[0056] The words "include" or similar words used in the patent application specification and claims of the present invention mean that the items appearing before "include" include the items listed after "include" or their equivalents, and do not exclude other items.

[0057] The numerical values ​​mentioned in the present invention include all numerical values ​​that increase from low to high by one unit, assuming that there are at least two units between any lower value and the higher value. For example, if a component or a physical quantity is said to be from 1 to 100, 10 to 90 is more preferred, and 20 to 80 is the most preferred, it is intended to express that values ​​such as 5 to 95, 14 to 76, 23 to 67, 32 to 58, 41 to 49 are clearly listed in this specification; for values ​​less than 1, 0.0001, 0.001, 0.01 or 0.1 are considered to be more suitable as a unit. The above examples are for illustrative purposes only. In fact, all numerical combinations between the lowest value and the highest value listed are deemed to be clearly listed in this specification in a similar manner.

[0058] Example 1

[0059] like Figure 1-2 As shown, this embodiment provides a heating furnace, comprising: a furnace body 1, and a roller conveyor (not shown in the figure) for conveying materials through the furnace body 1; the furnace body 1 has a feeding area 11, a preheating area 12, a heating area 13, and a cooling and discharging area 14 which are sequentially connected and arranged; wherein,

[0060] The feeding area 11 is provided with a feeding furnace door 110 and a feeding water pool 112; the feeding furnace door 110 divides the feeding area 11 into an external feeding area and an internal feeding area, and the internal feeding area is connected to the preheating area 12; the feeding furnace door 110 is located in the feeding water pool 112, and the depth of the water filled in the feeding water pool 112 at least covers the material and the bottom of the feeding furnace door 110, so that when the material passes through the feeding furnace door 110, the material does not contact the air at all; the feeding water pool 112 has a feeding down slope 111 and a feeding up slope 113, the feeding down slope 111 has a first angle α1 with the horizontal direction, the feeding up slope 113 has a second angle α2 with the horizontal direction, and the first angle α1 and the second angle α2 satisfy that the time length of the material passing through the feeding water pool 112 is a first preset time length;

[0061] The preheating zone 12 is provided with a first atmosphere adjustment device 101 to adjust the oxygen content in the preheating zone 12 to a first preset oxygen content;

[0062] The heating zone 13 is provided with a second atmosphere adjustment device 102 to adjust the oxygen content in the heating zone 13 to a second preset oxygen content;

[0063] The cooling and discharging area 14 is provided with a third atmosphere adjusting device 103 to adjust the oxygen content in the cooling and discharging area 14 to a third preset oxygen content; the cooling and discharging area 14 is also provided with a discharging furnace door 140 and a discharging water pool 142; the discharging furnace door 142 separates the cooling and discharging area 14 into an internal cooling and discharging area and an external cooling and discharging area, and the heating area 13 is connected to the internal cooling and discharging area; the discharging furnace door 140 is located in the discharging water pool 142, and the water filled in the discharging water pool 142 The depth is at least above the bottom of the material and the discharge furnace door 140, so that the material does not contact the air at all when passing through the discharge furnace door 140; the discharge water pool 142 has a discharge downward slope 141 and a discharge upward slope 143, the discharge downward slope 141 has a third angle β1 with the horizontal direction, the discharge upward slope 143 has a fourth angle β2 with the horizontal direction, and the third angle β1 and the fourth angle β2 satisfy that the time length for the material to pass through the discharge water pool 142 is the second preset time length.

[0064] It can be understood by those skilled in the art that, in the present embodiment, the lower slope, the bottom of the water pool, and the upper slope are all arranged in sequence so as to satisfy the process of materials entering the water pool, materials passing through the water pool, and materials leaving the water pool; in this way, both the lower slope and the upper slope have a tendency to tilt toward the bottom plate of the furnace door.

[0065] In a preferred embodiment, the heating furnace is a natural gas heating furnace.

[0066] Example 2

[0067] This embodiment provides a method for continuously depainting waste enameled wires, using the heating furnace described in Embodiment 1, and the steps include:

[0068] The waste enameled wire passes through the feeding area 11, the preheating area 12, the heating area 13, and the cooling and discharging area 14 of the furnace body 1 in sequence through the roller conveyor; wherein,

[0069] The waste enameled wire is in the feed water pool 112 of the feed area 11, and the internal air of the waste enameled wire is completely squeezed out by the water filled in the feed water pool 112;

[0070] The surface paint film of the waste enameled wire is completely carbonized in the heating zone 13;

[0071] The waste enameled wire is cooled in the cooling and discharging zone 14 while maintaining a certain temperature, and the carbonized paint film on the surface of the waste enameled wire falls off in the cooling and discharging zone 14;

[0072] After the waste enameled wire leaves the cooling and discharging area 14 , the waste enameled wire dries the water on its surface brought out by passing through the discharging water pool 142 at its maintained temperature.

[0073] In this embodiment, the first angle α1 is 15°, the depth of the water filled in the feed water pool is at least 1 cm above the waste enameled wire, the depth of the water filled in the feed water pool is at least 2 cm above the bottom of the feed furnace door, the time length of the waste enameled wire passing through the feed water pool is 3 minutes, the second angle α2 is 15°, and the time length of the waste enameled wire leaving the feed water pool is 10 minutes;

[0074] The first preset oxygen content is 1.5%-2.0%;

[0075] The second preset oxygen content is 0.8%-1.0%, the temperature of the heating zone 13 is 650°C-700°C, and the time for the waste enameled wire to pass through the heating zone 13 is 45 minutes;

[0076] The third preset oxygen content is 0.8%-1.0%, the third angle β1 is 15°, the temperature of the water filled in the discharge water pool 142 is 75°C-80°C, the depth of the water filled in the discharge water pool is at least 2 cm above the waste enameled wire, the depth of the water filled in the discharge water pool is at least 1 cm above the bottom of the discharge furnace door, the time for the waste enameled wire to pass through the discharge water pool is 10 minutes, the fourth angle β2 is 15°, and the time for the waste enameled wire to leave the discharge water pool is 5 minutes.

[0077] Example 3

[0078] This embodiment provides a method for continuously depainting waste enameled wires, using the heating furnace described in Embodiment 1, and the steps include:

[0079] The waste enameled wire passes through the feeding area 11, the preheating area 12, the heating area 13, and the cooling and discharging area 14 of the furnace body 1 in sequence through the roller conveyor; wherein,

[0080] The waste enameled wire is in the feed water pool 112 of the feed area 11, and the internal air of the waste enameled wire is completely squeezed out by the water filled in the feed water pool 112;

[0081] The surface paint film of the waste enameled wire is completely carbonized in the heating zone 13;

[0082] The waste enameled wire is cooled in the cooling and discharging zone 14 while maintaining a certain temperature, and the carbonized paint film on the surface of the waste enameled wire falls off in the cooling and discharging zone 14;

[0083] After the waste enameled wire leaves the cooling and discharging area 14 , the waste enameled wire dries the water on its surface brought out by passing through the discharging water pool 142 at its maintained temperature.

[0084] In this embodiment, the first angle α1 is 25°, the depth of the water filled in the feed water pool is at least 2 cm above the waste enameled wire, the depth of the water filled in the feed water pool is at least 2 cm above the bottom of the feed furnace door, the time for the waste enameled wire to pass through the feed water pool is 3 minutes, the second angle α2 is 25°, and the time for the waste enameled wire to leave the feed water pool is 10 minutes;

[0085] The first preset oxygen content is 2.0%-2.5%;

[0086] The second preset oxygen content is 0.8%-1.0%, the temperature of the heating zone 13 is 600°C-650°C, and the time for the waste enameled wire to pass through the heating zone 13 is 50 minutes;

[0087] The third preset oxygen content is 0.8%-1.0%, the third angle β1 is 25°, the temperature of the water filled in the discharge water pool 142 is 65°C-70°C, the depth of the water filled in the discharge water pool is at least 2 cm above the waste enameled wire, the depth of the water filled in the discharge water pool is at least 1 cm above the bottom of the discharge furnace door, the time for the waste enameled wire to pass through the discharge water pool is 10 minutes, the fourth angle β2 is 25°, and the time for the waste enameled wire to leave the discharge water pool is 5 minutes.

[0088] Detection Example

[0089] The paint stripping yields of the continuous paint stripping methods in Example 2 and Example 3 were calculated respectively:

[0090] Paint stripping recovery rate = the mass of waste enameled wire after paint stripping ÷ (the mass of waste enameled wire before paint stripping × (1-the mass fraction of surface paint film relative to waste enameled wire))

[0091] The results are shown in the following table:

[0092] Paint stripping yield (%) Example 2 99.5 Example 3 99.3

[0093] In summary, the heating furnace and the continuous paint stripping method of waste enameled wire of the present invention effectively isolate the outside air through the feed water pool and the discharge water pool, and through the atmosphere adjustment device, ensure that the pyrolysis process is carried out in an anaerobic or low-oxygen environment, thereby avoiding the oxidation loss of the copper wire, ensuring the surface brightness of the paint stripping material, and the paint stripping yield is greater than 99%.

[0094] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A heating furnace, comprising: A furnace body (1), and a roller conveyor for conveying materials through the furnace body (1); characterized in that the furnace body (1) has a feeding area (11), a preheating area (12), a heating area (13), and a cooling and discharging area (14) which are sequentially connected and arranged; wherein: The feeding zone (11) is provided with a feeding furnace door (110) and a feeding water pool (112); the feeding furnace door (110) divides the feeding zone (111) into an external feeding area and an internal feeding area, and the internal feeding area is connected to the preheating zone (12); the feeding furnace door (110) is located in the feeding water pool (112), and the depth of water filled in the feeding water pool (112) at least covers the material and the bottom of the feeding furnace door (110), so that when the material passes through the feeding furnace door (110), the material does not contact the air at all; The preheating zone (12) is provided with a first atmosphere adjustment device (101) for adjusting the oxygen content in the preheating zone (12) to a first preset oxygen content; The heating zone (13) is provided with a second atmosphere adjustment device (102) for adjusting the oxygen content in the heating zone (13) to a second preset oxygen content; The cooling and discharging area (14) is provided with a discharging furnace door (140) and a discharging water pool (142); the discharging furnace door (142) divides the cooling and discharging area (14) into an internal cooling and discharging area and an external cooling and discharging area, and the heating area (13) is connected to the internal cooling and discharging area; the discharging furnace door (140) is located in the discharging water pool (142), and the depth of water filled in the discharging water pool (142) at least covers the bottom of the material and the discharging furnace door (140), so that the material does not contact the air at all when passing through the discharging furnace door (140).

2. The heating furnace according to claim 1, characterized in that: The feed pool (112) has a feed down slope (111) and a feed up slope (113); the feed down slope (111) has a first angle (α1) with the horizontal direction; the feed up slope (113) has a second angle (α2) with the horizontal direction; the first angle (α1) and the second angle (α2) satisfy that the time length for the material to pass through the feed pool (112) is a first preset time length.

3. The heating furnace according to claim 3, characterized in that: The first angle (α1) is 15°-30°, the second angle (α2) is 15°-30°, and the first preset time length is 5 min-60 min.

4. The heating furnace according to claim 1, characterized in that: The cooling and discharging zone (14) is also provided with a third atmosphere adjusting device (103) to adjust the oxygen content in the cooling and discharging zone (14) to a third preset oxygen content.

5. The heating furnace according to claim 6, characterized in that: The first preset oxygen content is 1.5%-2.5%, the second preset oxygen content is 0.7%-1.2%, and the third preset oxygen content is 0.7%-1.2%.

6. The heating furnace according to claim 1, characterized in that: The discharge pool (142) has a discharge downward slope (141) and a discharge upward slope (143), the discharge downward slope (141) has a third angle (β1) with the horizontal direction, the discharge upward slope (143) has a fourth angle (β2) with the horizontal direction, and the third angle (β1) and the fourth angle (β2) satisfy that the time length for the material to pass through the discharge pool (142) is a second preset time length.

7. The heating furnace according to claim 8, characterized in that: The third angle (β1) is 15°-30°, the fourth angle (β2) is 15°-30°, and the second preset time length is 10 min-40 min.

8. A method for continuously stripping waste enameled wire, using the heating furnace according to any one of claims 1 to 7, characterized in that the steps include: The waste enameled wire passes through the feeding zone (11), the preheating zone (12), the heating zone (13), and the cooling and discharging zone (14) of the furnace body (1) in sequence via a roller conveyor; wherein: The waste enameled wire is placed in the feed water pool (112) of the feed zone (11), and the air inside the waste enameled wire is completely squeezed out by the water filled in the feed water pool (112); The surface paint film of the waste enameled wire is completely carbonized in the heating zone (13); The waste enameled wire is cooled in the cooling and discharging zone (14) while maintaining a certain temperature, and the carbonized paint film on the surface of the waste enameled wire falls off in the cooling and discharging zone (14); After the waste enameled wire leaves the cooling and discharging zone (14), the waste enameled wire dries the water on its surface brought out by passing through the discharging water pool (142) at its maintained temperature.

9. The continuous paint stripping method according to claim 8, characterized in that: The temperature of the heating zone (13) is 550°C-750°C, and the time for the waste enameled wire to pass through the heating zone (13) is 5 minutes-60 minutes.

10. The continuous paint stripping method according to claim 8, characterized in that: The temperature of the water filled in the discharge water pool (142) is 60°C-80°C, so that the waste enameled wire is cooled in the cooling discharge zone (14) but maintains a certain temperature.

Images