A devolatilization furnace including a heat recovery device and a devolatilization method

Abstract

The application discloses a glue discharging furnace and glue discharging method comprising a heat recovery device, and belongs to the field of glue discharging technology. The glue discharging furnace comprising a heat recovery device comprises a furnace chamber, a waste gas catalytic combustion device, a heating device, a heat recovery device and a temperature control system. The heat recovery device is internally provided with a fresh air channel and a waste heat recovery fluid channel. The two ends of the fresh air channel are respectively connected with an air inlet fan and the heating device. The two ends of the waste heat recovery fluid channel are respectively connected with the waste gas catalytic combustion device and an air outlet fan. The temperature control system is used for setting temperature parameters. Through the synergistic cooperation of the waste gas catalytic combustion device, the heating device, the heat recovery device and the temperature control system, the embodiment of the application can improve the waste heat recovery effect and the glue discharging effect at the same time. The potential heat energy in the glue discharging waste gas is fully utilized, the composition of the air source can be avoided from being changed by mixing the glue discharging waste gas with fresh air, the heating device can be avoided from being excessively heated to waste energy, and the energy saving and environmental protection and high quality and high efficiency can be truly realized.

Description

Technical Field

[0001] This invention relates to the field of adhesive removal and adhesive removal furnace technology for passive electronic components, and in particular to an adhesive removal furnace and adhesive removal method including a heat recovery device. Background Technology

[0002] Currently, the commonly used debinding furnaces in the processing of passive electronic components (also called passive devices) such as capacitors and inductors are of the hot air circulation type, consisting of the following parts: air inlet, exhaust outlet, heating element, fan, and furnace chamber. The principle is that electrical components control the heating element to generate heat. The fan draws fresh air from the air inlet, which flows over the surface of the heating element, raising the air temperature and forming hot air. This hot air circulates through the furnace chamber's air ducts, flowing over the product surface to heat it and remove the glue. After circulation, the hot air is discharged from the exhaust outlet. However, the hot air still carries away a significant amount of heat when it exits the exhaust outlet. For example, with the equipment's maximum temperature set at 460℃, the temperature at the exhaust outlet after circulation is still as high as 440℃. This requires the heating element to continuously output high power, resulting in significant energy waste. Furthermore, the heat from the exhaust outlet easily dissipates into the workshop, leading to high ambient temperatures and a continuously deteriorating working environment. In addition, the exhaust gas generated during the debinding process circulates within the furnace chamber, affecting the debinding environment and the debinding effect on the product.

[0003] To address the aforementioned energy waste issues, one energy-saving hot air furnace recycling device utilizes a filter disc to filter the flue gas flowing from the receiving pipe to the conveying pipe, preventing impurities inside the flue gas from clogging the heat pipes. This allows the heat from the flue gas discharged from the furnace to be reused, achieving energy conservation and emission reduction for the furnace. Another energy-saving hot air furnace fully utilizes hot flue gas and saves energy by heating the flue pipes, introducing waste hot flue gas into the heating area, fully absorbing and utilizing the heat of the waste flue gas before discharging it into the atmosphere, thus saving energy. However, while the above technologies have some energy-saving effects, they are not suitable for glue removal furnaces and cannot solve the problem of poor glue removal efficiency.

[0004] It should be noted that the information disclosed in the background section above is only for understanding the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] To overcome the aforementioned deficiencies of the prior art, this application provides a glue removal furnace including a heat recovery device, comprising: a glue removal furnace body and a furnace chamber disposed within the glue removal furnace body, a waste gas catalytic combustion device, a heating device, a heat recovery device, and a temperature control system;

[0006] A first airflow channel and a second airflow channel are provided between the glue removal furnace body and the furnace chamber;

[0007] The side wall of the furnace is provided with a multi-channel air inlet and a multi-channel air outlet. The multi-channel air inlet corresponds to the first airflow channel, and the multi-channel air outlet corresponds to the second airflow channel.

[0008] The waste gas catalytic combustion device and the heating device are located between the glue removal furnace body and the furnace chamber;

[0009] The heat recovery device is located outside the glue removal furnace body and has a fresh air duct and a waste heat recovery fluid duct inside. The two ends of the fresh air duct are respectively connected to the air intake fan and the heating device, and the two ends of the waste heat recovery fluid duct are connected to the waste gas catalytic combustion device and the exhaust fan.

[0010] The temperature control system is used to control the heating device to heat up according to a preset temperature curve.

[0011] The present invention may also employ the following optional / preferred solutions:

[0012] It also includes a flow linkage adjustment device, which includes a control module and a gas pressure detection device. The gas pressure detection device is located inside the furnace. The control module adjusts the exhaust volume of the exhaust fan according to the gas pressure signal provided by the gas pressure detection device.

[0013] The multi-channel air inlet is an air inlet louvered fan, and the multi-channel air outlet is an air outlet louvered fan.

[0014] The fresh air duct and the waste heat recovery fluid duct are arranged side by side and closely fitted together.

[0015] The waste heat recovery fluid channel is the inner cavity of the heat recovery device, and the fresh air channel is located inside the waste heat recovery fluid channel; or, the fresh air channel is the inner cavity of the heat recovery device, and the waste heat recovery fluid channel is located inside the fresh air channel.

[0016] The waste heat recovery fluid channel is equipped with multiple airflow baffles that allow airflow to detour and enhance the heat exchange effect; or, the fresh air channel is equipped with multiple airflow baffles that allow airflow to detour and enhance the heat exchange effect.

[0017] The embodiments of this application also provide a glue removal method, which uses a glue removal furnace including a heat recovery device as described in any of the above. Fresh air enters the heating device through the fresh air channel and is heated to the required temperature. Then, it enters the furnace through the first airflow channel and the multi-channel air inlet. After heating the product to be glued, glue removal exhaust gas is generated.

[0018] The exhaust gas is discharged through the multi-channel outlet to the second airflow channel, and then enters the exhaust gas catalytic combustion device for catalytic combustion, generating exhaust gas decomposition products and producing a large amount of heat;

[0019] The residual heat of the exhaust gas and the heat generated by its catalytic combustion enter the heat recovery device together, replacing the heat with the fresh air in the fresh air duct to preheat it. The decomposition products of the exhaust gas and the incompletely decomposed exhaust gas are discharged through the exhaust fan.

[0020] The temperature control system is used to control the heating device to heat up according to a preset temperature curve.

[0021] Preferably, the exhaust volume of the exhaust fan is also adjusted by the flow linkage adjustment device to maintain the uniformity of the airflow.

[0022] The one or more technical solutions provided in this application have at least the following advantages compared with the prior art:

[0023] Through the coordinated operation of the waste gas catalytic combustion device, heating device, heat recovery device, and temperature control system, the embodiments of the present invention can simultaneously improve the waste heat recovery effect and the glue removal effect. This not only makes full use of the potential heat energy in the glue removal waste gas, but also avoids the glue removal waste gas from mixing with fresh air and changing the composition of the gas source, thereby ensuring the consistency of process conditions. It can also avoid the heating device from overheating and wasting energy, truly achieving energy saving, environmental protection, high quality and high efficiency.

[0024] By using a flow-linked adjustment device, the uniformity of gas flow rate can be maintained, resulting in better glue removal. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a glue-removing furnace including a heat recovery device, according to one embodiment;

[0026] Figure 2 This is a flowchart of an embodiment of a glue removal method. Detailed Implementation

[0027] Existing glue removal methods and their furnaces involve recycling the exhaust gas after heat recovery or transporting it to other areas requiring heating, with only simple filtration of the exhaust gas. Because the gas composition changes after passing through the heating area or furnace, directly recycling it back into the furnace alters its composition compared to the original gas source. This changes the process conditions and affects the glue removal efficiency.

[0028] For passive electronic components such as capacitors and inductors, the debinding process requires the waste gas containing adhesive to be quickly carried away. If the existing technology is used, the adhesive discharged from the product will re-enter the furnace, which is not conducive to promoting the debinding process, affecting the debinding efficiency, and may even prevent the achievement of the desired debinding effect.

[0029] This invention patent utilizes the coordinated operation of a waste gas catalytic combustion device, a heating device, a heat recovery device, and a temperature control system to recover and reuse only the waste heat from the exhaust gas and the waste heat generated by the catalytic decomposition of the waste gas, while preventing the waste gas and the products of the catalytic decomposition from entering the furnace. This allows for the reuse and more efficient utilization of the waste heat from the glue discharge waste gas and the heat generated by the catalytic decomposition of the glue discharge waste gas, saving energy and protecting the environment. Furthermore, it prevents waste gas containing glue from entering the furnace, thus ensuring the quality of the glue discharge process.

[0030] The following is in conjunction with the appendix Figure 1-2 The invention will be further described below with reference to specific embodiments, wherein the same reference numerals denote the same parts unless otherwise specifically stated. It should be emphasized that the following description is merely exemplary and not intended to limit the scope of the invention or its application.

[0031] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component. Furthermore, a connection can be used for fixing, coupling, or communication.

[0032] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] Example 1

[0035] A debinding furnace including a heat recovery device, such as Figure 1 As shown, it includes a glue removal furnace body and a furnace chamber 1 located inside the glue removal furnace body, a waste gas catalytic combustion device 3, a heating device 8, a heat recovery device 5, and a temperature control system.

[0036] A first airflow channel 11 and a second airflow channel 12 are provided between the degumming furnace body and the furnace chamber 1. The first airflow channel 11 is used to transport the hot air formed by the heating device 8 to the furnace chamber 1. The second airflow channel 12 is used to transport the degumming waste gas generated after the hot air degummes the degummed products 9 (such as passive electronic components such as capacitors and inductors) to the waste gas catalytic combustion device 3.

[0037] The side wall of the furnace chamber 1 is provided with a multi-channel air inlet 21 and a multi-channel air outlet 22. The multi-channel air inlet 21 corresponds to the first airflow channel 11, so that hot air from the first airflow channel 11 can be evenly introduced into the furnace chamber 1 through the multi-channel air inlet 21 to heat up and remove glue from the product 20 in the furnace chamber 1. The multi-channel air outlet 22 corresponds to the second airflow channel 12, so that the glue removal waste gas generated in the furnace chamber 1 can be discharged from the multi-channel air outlet 22 into the second airflow channel 12. Preferably, both the multi-channel air inlet 21 and the multi-channel air outlet 22 are louvered air inlets.

[0038] The waste gas catalytic combustion device 3 and the heating device 8 are located between the glue-discharging furnace body and the furnace chamber 1. The outlet of the heating device 8 is connected to the first airflow channel 11, and the inlet of the waste gas catalytic combustion device 3 is connected to the second airflow channel 12, so as to receive the glue-discharging waste gas and catalytically combust it inside. After catalytic combustion, the glue-discharging waste gas will generate a large amount of heat and produce waste gas decomposition products. The waste gas decomposition products (including carbon dioxide and water, etc.) have a large amount of residual heat.

[0039] The heat recovery device 5 is located outside the glue removal furnace body and has a fresh air channel and a waste heat recovery fluid channel (not shown in the figure). The two ends of the fresh air channel are respectively connected to the air intake fan 4 and the heating device 8, and the two ends of the waste heat recovery fluid channel are respectively connected to the waste gas catalytic combustion device 3 and the exhaust fan 7.

[0040] Furthermore, the fresh air duct and the waste heat recovery fluid duct can be configured in various ways, including but not limited to the following:

[0041] 1) The fresh air duct and the waste heat recovery fluid duct are arranged side by side and closely fitted together, both located inside the heat recovery device 5. This close fit arrangement enhances the efficiency of heat exchange.

[0042] 2) The waste heat recovery fluid channel is the inner cavity of the heat recovery device 5. The fresh air channel is located inside the waste heat recovery fluid channel, which is equipped with multiple airflow baffles 51 that allow airflow to detour and enhance heat exchange. In this structure, the fresh air channel can be directly heated by the large amount of heat generated by the catalytic combustion of the exhaust gas, and is surrounded by the decomposition products of the exhaust gas, which have a large amount of waste heat. The detour of these waste gas decomposition products allows for more thorough heat exchange.

[0043] 3) The fresh air duct is the inner cavity of the heat recovery device 5. The waste heat recovery fluid channel is located inside the fresh air duct. The fresh air duct is equipped with multiple airflow baffles 51 that allow airflow to pass through in a detour to enhance the heat exchange effect. In this structure, the fresh air in the fresh air duct surrounds the waste heat recovery fluid channel. Because the fresh air passes through in a detour, sufficient heat exchange can also be achieved.

[0044] The temperature control system includes a temperature setting module, a heating control module, and a flow regulating device, used to: set and control the heating device 8 to heat up according to a preset temperature curve, and adjust the air supply volume of the intake fan 4 and the exhaust volume of the exhaust fan 7 in a timely manner through the flow regulating device.

[0045] In this embodiment, the heat recovery device 5 and the exhaust fan 7 may also be equipped with an exhaust valve 6, preferably an adjustable exhaust valve, so as to cooperate with the temperature control system to control the exhaust speed and better exhaust according to the exhaust curve.

[0046] Example 2

[0047] This embodiment, based on the aforementioned Embodiment 1, further includes a flow-linkage adjustment device (not shown in the figure). The flow-linkage adjustment device includes a control module and a pressure detection device. The pressure detection device is located inside the furnace. The control module adjusts the exhaust fan's airflow based on the pressure signal provided by the pressure detection device, thereby achieving linked adjustment of the exhaust flow. The control module can be a control IC or PLC circuit, etc., and the pressure detection device can be a pressure sensor.

[0048] Example 3

[0049] A glue removal method employs a glue removal furnace including a heat recovery device as described in Embodiment 1 or 2 above, and the glue removal process is as follows: Figure 2As shown, firstly, the temperature and wind speed parameters are set according to the preset temperature curve by the temperature control system according to actual needs. Then, the heating device 8 is controlled to heat the fresh air and / or preheated fresh air. The hot air, after reaching the required temperature, enters the furnace 1 through the first airflow channel 11 and the multi-channel air inlet 21. The hot air flows over the surface of the product 9 to remove the glue. The glue removal exhaust gas is discharged through the multi-channel air outlet 22 to the second airflow channel 12, and then enters the exhaust gas catalytic combustion device 3 for catalytic combustion, generating exhaust gas decomposition products and a large amount of heat. The residual heat of the glue removal exhaust gas and the heat generated by catalytic combustion enter the heat recovery device 5 together, replacing the heat with the fresh air in the fresh air channel to preheat it. The exhaust gas decomposition products and trace amounts of incompletely decomposed glue removal exhaust gas are now at low temperature and relatively environmentally friendly, and can be discharged through the exhaust fan 7.

[0050] During operation, the temperature control system also adjusts the air volume of the intake fan and the exhaust fan 7 in a timely manner through the flow regulation device to maintain the uniformity of the air speed, so as to avoid insufficient heating temperature affecting the glue removal effect, or excessive heating wasting energy, or even affecting the quality of the product.

[0051] In addition, preferably, the hot air flowing over the surface of the product 9 can be adjusted by the flow linkage adjustment device to make the air speed more uniform and achieve a better glue removal effect.

[0052] The above description provides a further detailed explanation of the present invention in conjunction with specific / preferred embodiments, and it should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various substitutions or modifications can be made to these described embodiments without departing from the concept of the present invention, and all such substitutions or modifications should be considered within the scope of protection of the present invention. In the description of this specification, the reference to terms such as "an embodiment," "some embodiments," "preferred embodiment," "example," "specific example," or "some examples," etc., indicates that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions, and modifications can be made herein without departing from the scope of protection of the patent application.

Claims

1. A glue-removing furnace including a heat recovery device, characterized in that, include: The glue removal furnace body and the furnace chamber located inside the glue removal furnace body, the waste gas catalytic combustion device, the heating device, the heat recovery device and the temperature control system; A first airflow channel and a second airflow channel are provided between the glue removal furnace body and the furnace chamber; The side wall of the furnace is provided with a multi-channel air inlet and a multi-channel air outlet. The multi-channel air inlet corresponds to the first airflow channel, so that hot air from the first airflow channel can be evenly introduced into the furnace through the multi-channel air inlet to heat up and remove glue from the product in the furnace. The multi-channel air outlet corresponds to the second airflow channel to discharge the glue removal waste gas generated in the furnace from the multi-channel air outlet to the second airflow channel. The waste gas catalytic combustion device and the heating device are located between the glue removal furnace body and the furnace chamber. The outlet of the heating device is connected to the first airflow channel, and the inlet of the waste gas catalytic combustion device is connected to the second airflow channel, so as to receive the glue removal waste gas and catalytically combust the glue removal waste gas inside. After catalytic combustion, the glue removal waste gas will generate a large amount of heat and generate waste gas decomposition products. The waste gas decomposition products have a large amount of residual heat. The heat recovery device is located outside the glue removal furnace body and has a fresh air duct and a waste heat recovery fluid duct inside. The two ends of the fresh air duct are respectively connected to the air intake fan and the heating device, and the two ends of the waste heat recovery fluid duct are connected to the waste gas catalytic combustion device and the exhaust fan. The temperature control system is used to control the heating device to heat up according to a preset temperature curve.

2. The debinding furnace including a heat recovery device as described in claim 1, characterized in that, It also includes a flow linkage adjustment device, which includes a control module and a gas pressure detection device. The gas pressure detection device is located inside the furnace. The control module adjusts the exhaust volume of the exhaust fan according to the gas pressure signal provided by the gas pressure detection device.

3. The debinding furnace including a heat recovery device as described in claim 2, characterized in that, The multi-channel air inlet is an air inlet louvered fan, and the multi-channel air outlet is an air outlet louvered fan.

4. The glue-removing furnace including a heat recovery device as described in any one of claims 1-3, characterized in that, The fresh air duct and the waste heat recovery fluid duct are arranged side by side and closely fitted together.

5. The glue-removing furnace including a heat recovery device as described in any one of claims 1-3, characterized in that, The waste heat recovery fluid channel is the inner cavity of the heat recovery device, and the fresh air channel is located within the waste heat recovery fluid channel, or... The fresh air duct is the inner cavity of the heat recovery device, and the waste heat recovery fluid duct is located inside the fresh air duct.

6. The glue-removing furnace including a heat recovery device as described in claim 5, characterized in that, The waste heat recovery fluid channel is equipped with multiple airflow baffles that allow the airflow to detour and enhance the heat exchange effect, or... The fresh air duct is equipped with multiple airflow baffles that allow airflow to detour and enhance heat exchange.

7. A method for removing adhesive, characterized in that, The glue-removing furnace, as described in any one of 1-6, includes a heat recovery device. Fresh air enters the heating device through the fresh air channel and is heated to the required temperature. Then, it enters the furnace chamber through the first airflow channel and the multi-channel air inlet. After heating the glue-removing product, glue-removing exhaust gas is generated. The exhaust gas is discharged through the multi-channel outlet to the second airflow channel, and then enters the exhaust gas catalytic combustion device for catalytic combustion, generating exhaust gas decomposition products and producing a large amount of heat; The residual heat of the exhaust gas and the heat generated by its catalytic combustion enter the heat recovery device together, replacing the heat with the fresh air in the fresh air duct to preheat it. The decomposition products of the exhaust gas and the incompletely decomposed exhaust gas are discharged through the exhaust fan. The temperature control system is used to control the heating device to heat up according to a preset temperature curve.

8. The glue removal method as described in claim 7, characterized in that, The exhaust volume of the exhaust fan is also adjusted by a flow linkage regulating device to maintain the uniformity of gas flow rate.

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