Annealing furnace with thermal energy recovery mechanism

Abstract

The application relates to the technical field of annealing furnaces, and provides an annealing furnace with a heat energy recovery mechanism, which comprises an annealing furnace body, a waste heat recovery tank, an air inlet pipe and an air outlet pipe, the waste heat recovery tank is provided with multiple partition plates, all the partition plates divide the waste heat recovery tank into multiple heating cavities, the partition plates are provided with communication holes for connecting two adjacent heating cavities, the air inlet pipe penetrates through the waste heat recovery tank and is connected with the annealing furnace body, the air inlet pipe is used for injecting air into the annealing furnace body, the air outlet pipe comprises a first air outlet pipe and a second air outlet pipe which are both connected with the waste heat recovery tank, the first air outlet pipe is used for discharging waste gas in the annealing furnace body into the waste heat recovery tank, and the second air outlet pipe is used for discharging the waste gas in the waste heat recovery tank to the outside. The annealing furnace with the heat energy recovery mechanism can recover the waste heat of the waste gas discharged from the annealing furnace.

Description

Technical Field

[0001] This application relates to the field of annealing furnace technology, and in particular to an annealing furnace with a heat recovery mechanism. Background Technology

[0002] In the glass manufacturing industry, the annealing process, as a crucial post-processing step, has always received considerable attention. With the continuous growth of market demand and the gradual increase in quality requirements for glass products, the importance of the annealing process has become increasingly prominent. Effective annealing can significantly improve the stability and reliability of glass products, providing a solid quality guarantee for their subsequent applications.

[0003] Currently, the industry standard practice in glass annealing is to address internal stress issues by employing traditional annealing processes. These processes primarily rely on a furnace to slowly cool the glass, thereby eliminating uneven temperature distribution and structural stress within the glass.

[0004] When processing exhaust gases from the annealing of high-temperature workpieces, the accumulated high-temperature exhaust gases are usually directly discharged into the atmosphere. This not only results in significant heat loss and increases production costs but also causes thermal pollution to the environment. Therefore, an annealing furnace capable of recovering heat energy is needed. Utility Model Content

[0005] In order to recover the waste heat from the exhaust gas from the annealing furnace, this application provides an annealing furnace with a heat recovery mechanism.

[0006] The annealing furnace with a heat recovery mechanism provided in this application adopts the following technical solution: An annealing furnace with a heat recovery mechanism includes an annealing furnace body, a waste heat recovery box, an inlet pipe, and an outlet pipe. The waste heat recovery box is provided with multiple partition plates, and all partition plates divide the waste heat recovery box into multiple heating chambers. The partition plates are provided with connecting holes for connecting two adjacent heating chambers. The air inlet pipe passes through opposite sides of the waste heat recovery box and is connected to the annealing furnace body. The air inlet pipe is used to inject air into the interior of the annealing furnace body. The air outlet pipe includes a first air outlet pipe and a second air outlet pipe, both of which are connected to the waste heat recovery box. The first air outlet pipe is used to discharge the waste gas in the annealing furnace body into the waste heat recovery box, and the second air outlet pipe is used to discharge the waste gas in the waste heat recovery box to the outside.

[0007] By adopting the above technical solution, the waste heat of the exhaust gas inside the annealing furnace body is used to heat the air injected into the inlet pipe before it is sent into the annealing furnace body, thereby realizing heat energy recovery and utilization, reducing heat energy loss and production costs, and reducing thermal pollution. The partition plates and connecting holes in the waste heat recovery box allow the exhaust gas to flow in multiple heating chambers, extending the residence time of the exhaust gas in the waste heat recovery box and improving the waste heat recovery efficiency.

[0008] Optionally, the connecting holes of two adjacent partition plates are staggered vertically.

[0009] By adopting the above technical solution, the connecting holes of two adjacent partition plates are staggered vertically, which makes the flow path of the exhaust gas in the waste heat recovery box more tortuous, prolongs the residence time of the exhaust gas in the waste heat recovery box, thereby improving the heat recovery efficiency.

[0010] Optionally, the air intake pipe includes a first air intake pipe, a second air intake pipe, and a plurality of heating pipes installed between the first air intake pipe and the second air intake pipe. The first air intake pipe and the second air intake pipe are respectively installed on opposite sides of the waste heat recovery box. All heating pipes are located in each heating chamber and are arranged in a serpentine pattern.

[0011] By adopting the above technical solution, the heating tubes are arranged in a serpentine pattern in each heating chamber, which can increase the air flow path and time in the heating tubes.

[0012] Optionally, a connecting pipe is provided between two adjacent heating tubes, the connecting pipe being connected to the heating tubes via a connecting assembly, and the connecting pipe being installed on a partition plate.

[0013] By adopting the above technical solution, the heating tube and the connecting tube can be detachably connected, making it easy to remove the heating tube from the outside for cleaning and replacement, so as to maintain the heat exchange efficiency of the heating tube.

[0014] Optionally, the connecting assembly includes an internally threaded sleeve, and both the heating tube and the connecting tube have threaded portions on their outer walls for threaded engagement with the internally threaded sleeve.

[0015] By adopting the above technical solution, the threaded fit between the internal threaded sleeve and the threaded part facilitates the installation and disassembly of the heating tube and the connecting tube, and makes the maintenance and repair of the equipment convenient.

[0016] Optionally, the connecting assembly includes a sliding sleeve, a positioning block, and a spring. The sliding sleeve is slidably installed at the end of the heating tube and is used to cover the outer wall of the connecting tube. The outer wall of the sliding sleeve has an installation hole, and the positioning block is slidably installed in the installation hole. The outer wall of the connecting tube has a positioning groove for the positioning block to be inserted into, and the spring force is used to make the positioning block normally inserted into the positioning groove.

[0017] By adopting the above technical solution, the connecting component adopts a structure of sliding sleeve, positioning block and spring. The spring force makes the positioning block inserted into the positioning groove of the connecting pipe under normal conditions, which can realize a stable connection between the heating tube and the connecting pipe, facilitate the overall assembly and disassembly of the air intake pipe, and facilitate subsequent maintenance and repair.

[0018] Optionally, the positioning block is provided with a guide surface, which is used to guide the positioning block to move toward the side away from the sliding sleeve.

[0019] By adopting the above technical solution, the convenience of connecting and disassembling the connecting pipe and the heating pipe is further improved.

[0020] Optionally, the inner wall of the heating chamber is provided with a support member, and the heating tube is mounted on the support member.

[0021] By adopting the above technical solution, the heating tube is mounted on the support, which facilitates the connection between the heating tube and the connecting tube, thus improving the ease of installation.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. By utilizing the waste heat of the exhaust gas inside the annealing furnace, the air injected into the inlet pipe is heated before being sent into the annealing furnace body, thereby realizing heat energy recovery and utilization, reducing heat energy loss and production costs, and reducing thermal pollution; the partition plates and connecting holes in the waste heat recovery box allow the exhaust gas to flow in multiple heating chambers, extending the residence time of the exhaust gas in the waste heat recovery box and improving the waste heat recovery efficiency. 2. By setting up a connection component, the heating element can be easily removed to the outside for cleaning and replacement, so as to maintain the heat exchange efficiency of the heating element. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of Example 1; Figure 2 This is a partial cross-sectional view of the waste heat recovery box in Example 1; Figure 3 This is a partial cross-sectional view of the waste heat recovery box in Example 2; Figure 4 This is a schematic diagram of the connection component in Embodiment 2.

[0024] Explanation of reference numerals in the attached drawings: 1. Annealing furnace body; 2. Waste heat recovery box; 21. Partition plate; 22. Heating chamber; 23. Connecting hole; 24. Mounting pipe; 25. Connecting pipe; 26. Positioning groove; 3. Air inlet pipe; 31. First air inlet pipe; 32. Second air inlet pipe; 33. Heating pipe; 4. Air outlet pipe; 41. First air outlet pipe; 42. Second air outlet pipe; 5. Connecting assembly; 51. Internal threaded sleeve; 52. Sliding sleeve; 53. Positioning block; 54. Spring; 55. Mounting hole; 56. Guide surface; 57. Pull block; 6. Support component. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1 =4 provides further details regarding this application.

[0026] Example 1: This application discloses an annealing furnace with a heat recovery mechanism.

[0027] Reference Figure 1 An annealing furnace with a heat recovery mechanism includes an annealing furnace body 1, a waste heat recovery box 2, an air inlet pipe 3, and an air outlet pipe 4. The waste heat recovery box 2 is located near the annealing furnace body 1. The air inlet pipe 3 passes through opposite sides of the waste heat recovery box 2 and is connected to the annealing furnace body 1. The air outlet pipe 4 is connected to the waste heat recovery box 2. This arrangement allows the high-temperature waste gas in the annealing furnace body 1 to be introduced into the waste heat recovery box 2 for heat recovery, and then the waste gas is discharged to the outside.

[0028] Reference Figure 2 The waste heat recovery box 2 includes multiple partition plates 21. The partition plates 21 are generally flat, and their size is designed according to the size of the waste heat recovery box 2. The partition plates 21 can be fixed inside the waste heat recovery box 2 by welding or bolting to ensure its stability.

[0029] All partition plates 21 divide the waste heat recovery box 2 into multiple heating chambers 22. Each partition plate 21 has a connecting hole 23 for connecting two adjacent heating chambers 22. The connecting hole 23 can be circular, square, etc., and its size is designed according to the flow rate of the waste gas and the heat exchange requirements. In this embodiment, the connecting holes of two adjacent partition plates 21 are staggered vertically to increase the residence time of hot gas in the waste heat recovery box 2.

[0030] The air inlet pipe 3 includes a first air inlet pipe 31, a second air inlet pipe 32, and multiple heating pipes 33 installed between the first air inlet pipe 31 and the second air inlet pipe 32. The first air inlet pipe 31 and the second air inlet pipe 32 are generally made of metal pipes, such as steel pipes, which have good sealing and corrosion resistance. The waste heat recovery box 2 is provided with mounting pipes 24 on opposite sides. The first air inlet pipe 31 and the second air inlet pipe 32 are connected to the two mounting pipes 24 by welding or flanges, respectively. The first air inlet pipe 31 is used to connect to the annealing furnace body 1, and the end of the second air inlet pipe 32 away from the waste heat recovery box 2 is connected to an external exhaust device.

[0031] The heating tube 33 is made of a material with good thermal conductivity, such as copper or aluminum tube, and is arranged in a serpentine shape. The partition plate 21 is provided with a connecting tube 25. The end of the heating tube 33 is connected to the connecting tube 25 through the connecting component 5, and the connecting tubes 25 at both ends are respectively connected to two mounting tubes 24.

[0032] In this embodiment, the connecting assembly 5 includes an internally threaded sleeve 51. Both the heating tube 33 and the connecting tube 25 have threaded portions on their outer walls for threaded engagement with the internally threaded sleeve 51. The internally threaded sleeve 51 is typically made of a metal material, such as a copper alloy, and its inner wall has a threaded structure. By rotating the internally threaded sleeve 51, the heating tube 33 and the connecting tube 25 can be tightly connected together. This connection method facilitates installation and disassembly, and makes it convenient for maintenance and replacement of the heating tube 33.

[0033] Since the connection method between heating tube 33 and mounting tube 24 is the same as the connection method between heating tube 33 and connecting tube 25, it will not be elaborated here.

[0034] Specifically, the exhaust pipe 4 includes a first exhaust pipe 41 and a second exhaust pipe 42, both connected to the waste heat recovery box 2. Both the first exhaust pipe 41 and the second exhaust pipe 42 are made of metal tubing, such as stainless steel. The first exhaust pipe 41 is used to discharge the waste gas from the annealing furnace body 1 into the waste heat recovery box 2. One end of the pipe is connected to the annealing furnace body 1, and the other end is connected to the waste heat recovery box 2. The connection is sealed by welding or flange connection. The second exhaust pipe 42 is used to discharge the waste gas from the waste heat recovery box 2 to the outside. One end of the pipe is connected to the waste heat recovery box 2.

[0035] In this embodiment, the first exhaust pipe 41 and the first intake pipe 31 are located on the same side of the waste heat recovery box 2, and the second exhaust pipe 42 and the second intake pipe 32 are located on the same side of the waste heat recovery box 2. That is, the exhaust gas with the highest temperature will heat the preheated air with the highest temperature after entering the heating chamber 22. In other embodiments, the first exhaust pipe 41 and the second intake pipe 32 are located on the same side of the waste heat recovery box 2, and the second exhaust pipe 42 and the first intake pipe 31 are located on the same side of the waste heat recovery box 2. That is, the exhaust gas with the highest temperature will heat the preheated air with the lowest temperature after entering the heating chamber 22.

[0036] The implementation principle of Embodiment 1 of this application is as follows: By utilizing the residual heat of the exhaust gas inside the annealing furnace body 1, the air injected into the air inlet pipe 3 is heated before being sent into the annealing furnace body 1, thereby realizing heat energy recovery and utilization, reducing heat energy loss and production costs, and also reducing thermal pollution. The partition plate 21 and the connecting hole 23 inside the waste heat recovery box 2 allow the exhaust gas to flow in multiple heating chambers 22, extending the residence time of the exhaust gas in the waste heat recovery box 2 and improving the waste heat recovery efficiency.

[0037] Example 2: This application discloses an annealing furnace with a heat recovery mechanism.

[0038] Reference Figure 3 and Figure 4The difference between Embodiment 2 and Embodiment 1 is that the connecting component 5 includes a sliding sleeve 52 tube, a positioning block 53 and a spring 54. The sliding sleeve 52 tube is slidably installed at the end of the heating tube 33 and is used to cover the outer wall of the connecting tube 25.

[0039] The outer wall of the sliding sleeve 52 tube has a mounting hole 55, and the positioning block 53 is slidably installed in the mounting hole 55. The outer wall of the connecting pipe 25 has a positioning groove 26 for the positioning block 53 to be inserted. The end of the positioning block 53 away from the sliding sleeve 52 tube is provided with a pull block 57, which is used to pull the position of the positioning block 53. The end of the positioning block 53 near the sliding sleeve 52 tube is provided with a guide surface 56, which is set as an inclined surface and is used to abut against the end of the connecting pipe 25, thereby guiding the positioning block 53 to move toward the side away from the sliding sleeve 52 tube.

[0040] Spring 54 is sleeved on the outer wall of positioning block 53, and the two ends of spring 54 are respectively connected to the outer wall of sliding sleeve 52 tube and pull block 57. The elastic force of spring 54 can drive positioning block 53 to move toward one side of sliding sleeve 52 tube so as to be stably inserted into positioning groove 26.

[0041] Reference Figure 3 In this embodiment, the heating chamber 22 is provided with support members 6 on both sides, and the two ends of the heating tube 33 are mounted on the support members 6. By mounting the heating tube 33 on the support members 6, the ends of the heating tube 33 are aligned with the ends of the connecting tube 25, so that the sliding sleeve 52 can be sleeved on the outer wall of the connecting tube 25.

[0042] The above are preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An annealing furnace with a heat recovery mechanism, characterized in that: The furnace includes an annealing furnace body (1), a waste heat recovery box (2), an air inlet pipe (3), and an air outlet pipe (4). The waste heat recovery box (2) is provided with multiple partition plates (21). All partition plates (21) divide the waste heat recovery box (2) into multiple heating chambers (22). The partition plates (21) are provided with connecting holes (23) for connecting two adjacent heating chambers (22). The air inlet pipe (3) passes through the opposite sides of the waste heat recovery box (2) and is connected to the annealing furnace body (1). The air inlet pipe (3) is used to inject air into the annealing furnace body (1). The air outlet pipe (4) includes a first air outlet pipe (41) and a second air outlet pipe (42) that are both connected to the waste heat recovery box (2). The first air outlet pipe (41) is used to discharge the waste gas in the annealing furnace body (1) into the waste heat recovery box (2). The second air outlet pipe (42) is used to discharge the waste gas in the waste heat recovery box (2) to the outside.

2. An annealing furnace with a heat recovery mechanism according to claim 1, characterized in that: The connecting holes (23) of two adjacent partition plates (21) are staggered vertically.

3. An annealing furnace with a heat recovery mechanism according to claim 1, characterized in that: The air intake pipe (3) includes a first air intake pipe (31), a second air intake pipe (32), and a plurality of heating pipes (33) installed between the first air intake pipe (31) and the second air intake pipe (32). The first air intake pipe (31) and the second air intake pipe (32) are respectively installed on opposite sides of the waste heat recovery box (2). All heating pipes (33) are located in each heating chamber (22), and the heating pipes (33) are arranged in a serpentine pattern.

4. An annealing furnace with a heat recovery mechanism according to claim 3, characterized in that: A connecting pipe (25) is provided between two adjacent heating tubes (33). The connecting pipe (25) is connected to the heating tube (33) through a connecting assembly (5). The connecting pipe (25) is installed on the partition plate (21).

5. An annealing furnace with a heat recovery mechanism according to claim 4, characterized in that: The connecting assembly (5) includes an internally threaded sleeve (51), and the outer walls of the heating tube (33) and the connecting tube (25) are provided with threaded portions for threaded engagement with the internally threaded sleeve (51).

6. An annealing furnace with a heat recovery mechanism according to claim 4, characterized in that: The connecting assembly (5) includes a sliding sleeve (52), a positioning block (53), and a spring (54). The sliding sleeve (52) is slidably installed at the end of the heating tube (33) and is used to cover the outer wall of the connecting tube (25). The outer wall of the sliding sleeve (52) has an installation hole (55), and the positioning block (53) is slidably installed in the installation hole (55). The outer wall of the connecting tube (25) has a positioning groove (26) for the positioning block (53) to be inserted into. The elastic force of the spring (54) is used to make the positioning block (53) normally inserted into the positioning groove (26).

7. An annealing furnace with a heat recovery mechanism according to claim 6, characterized in that: The positioning block (53) is provided with a guide surface (56), which is used to guide the positioning block (53) to move toward the side away from the sliding sleeve (52).

8. An annealing furnace with a heat recovery mechanism according to claim 4, characterized in that: The inner wall of the heating chamber (22) is provided with a support member (6), and the heating tube (33) is mounted on the support member (6).

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