Industrial waste gas energy collecting device and system

Abstract

The invention discloses an industrial waste gas energy collection device and system.The device comprises a main pipeline, a branch pipeline, blades and a power generation module, the blades are located in the branch pipeline, the power generation module is located on the outer sides of the branch pipeline and the main pipeline, the main pipeline comprises a first pipeline and a second pipeline which communicate with each other, and the inner diameter of the first pipeline is larger than that of the second pipeline; the branch pipeline is arranged on the side wall of the second pipeline, one end communicates with the second pipeline, and the other end is an open end. The power generation module comprises a rotor and a stator. By adopting the device provided by the invention, when the gas pressure in the second pipeline is reduced, the induction airflow capable of driving the blades in the branch pipeline to rotate is formed between the branch pipeline and the second pipeline, so that the rotor of the power generation module is driven by the blades to rotate relative to the stator, and a stable alternating current electric signal is generated. And the alternating current generated by the power generation module can be continuously supplied to external monitoring equipment, so that the airflow energy can be effectively recycled and utilized, and the operation stability of the monitoring equipment is improved.

Description

Technical Field

[0001] This application relates to the field of industrial waste gas energy recycling technology, and in particular to an industrial waste gas energy collection device and system. Background Technology

[0002] Industrial waste gas pipelines typically contain low-frequency, highly fluctuating gaseous energy. This type of energy is continuously generated during production processes, covering typical scenarios such as refining, steelmaking, building materials, metallurgy, and waste incineration. Spatially, it permeates multiple scenarios including plant pipe networks, flues, and ventilation shafts, and is characterized by its wide distribution, long online time, and local availability. Currently, there is still a significant disconnect between waste gas energy recovery and monitoring power supply: a large amount of recoverable low-frequency gaseous energy is wasted, and monitoring nodes mostly rely on wiring or periodic battery replacements, making it difficult to support a dense, long-term, low-maintenance industrial process monitoring network.

[0003] In addition, existing energy utilization technologies such as electromagnetic generators and photovoltaics often face problems such as high cost, limited efficiency, insufficient durability and harsh installation conditions under complex working conditions, making it difficult to work stably for a long time in a combined environment of low speed, intermittent, dusty and high humidity / high temperature.

[0004] Therefore, how to effectively recover and utilize low-frequency airflow energy, and improve the stability of monitoring equipment, has become a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] This application provides an industrial waste gas energy harvesting device and system to achieve effective recovery and utilization of low-frequency airflow energy, and to improve the stability of monitoring equipment.

[0006] In a first aspect, this application provides an industrial waste gas energy harvesting device, including a main pipeline, branch pipelines, blades, and a power generation module. The blades are located inside the branch pipelines, and the power generation module is located outside the branch pipelines and the main pipeline. The main pipeline includes a first pipeline and a second pipeline connected to each other, with the inner diameter of the first pipeline being larger than the inner diameter of the second pipeline. The branch pipeline is disposed on the side wall of the second pipeline, with one end connected to the second pipeline and the other end being an open end. The power generation module includes a rotor and a stator. The blades are connected to the rotor through a transmission mechanism to drive the rotor to rotate relative to the stator, thereby generating an alternating current signal.

[0007] The industrial waste gas energy harvesting device provided in this application, because the branch pipe is located on the side wall of the second pipe and connected to the second pipe, creates a pressure difference between the branch pipe and the second pipe when the gas pressure in the second pipe decreases. This causes the air in the branch pipe to flow from its open end towards the second pipe, forming an induced airflow that drives the blades within the branch pipe to rotate. This, in turn, causes the blades to drive the rotor of the power generation module to rotate relative to the stator, generating a stable AC signal. The AC power generated by the power generation module can also continuously power external monitoring equipment, enabling effective recovery and utilization of airflow energy (e.g., the airflow energy of low-frequency airflow) and improving the operational stability of the monitoring equipment.

[0008] Furthermore, since the induced airflow formed within the branch pipe is created by the accelerated flow of air from the external environment towards the second pipe, during exhaust gas emission, according to the principle of air pressure difference, the clean airflow within the branch pipe always flows towards the main pipe, while the exhaust gas in the main pipe flows along the first pipe towards the second pipe. This helps reduce the risk of exhaust gas intruding into the energy harvesting device via the branch pipe. Moreover, the direct connection between the main pipe and the exhaust pipe of the industrial equipment reduces the need for structural modifications to the exhaust pipe. In the event of a device malfunction, the device can be directly separated from the exhaust pipe, improving maintenance convenience.

[0009] In one possible implementation of this application, the transmission mechanism includes a first shaft and a second shaft. The first shaft extends along the open end of the branch pipe toward the second pipe and is connected to the second shaft via a gear set. A blade is disposed on the first shaft. Along the axial direction of the second shaft, the end of the second shaft opposite to the first shaft passes through the side wall of the branch pipe and is connected to the rotor. The second shaft is rotatably connected to the side wall of the branch pipe.

[0010] In one possible implementation of this application, the rotor includes a support structure and a moving member. The end of the second shaft opposite to the first shaft is connected to the support structure, and the moving member is disposed on the support structure. The stator includes an electrode portion and a friction layer. Along the axial direction of the second shaft, the friction layer is disposed on the surface of the electrode portion facing the support structure. The moving member is used to contact and rub against the friction portion, and the electrode portion is used to generate an alternating current signal.

[0011] In one possible implementation of this application, the support structure further includes multiple hollow portions and multiple grooves, which are alternately arranged along the circumference of the second axis; the rotor includes multiple moving parts, which are disposed in multiple grooves and cover at least part of the bottom of the grooves.

[0012] In one possible implementation of this application, the electrode portion includes a plurality of first electrodes and a plurality of second electrodes, which are alternately arranged along the circumferential direction of the second axis and have gaps between them; along the circumferential direction of the second axis, the width of the groove is less than or equal to the width of the first electrode.

[0013] In one possible implementation of this application, the support structure includes a groove, and along the axial direction of the second axis, there is a first gap between the bottom of the groove and the friction layer, and the size of the first gap is A1, and the moving member is located in the first gap; along the axial direction of the second axis, the size of the moving member is A2, and A2 < A1.

[0014] In one possible implementation of this application, the support structure and the friction layer are spaced apart along the axial direction of the second axis.

[0015] In one possible implementation of this application, the device further includes a housing and a connecting bearing, with the stator and rotor located inside the housing, and a portion of the connecting bearing embedded in the support structure; along the axial direction of the second shaft, the connecting bearing protrudes from the support structure toward the surface of the stator; along the axial direction of the second shaft, the housing is provided with a protrusion in the direction toward the rotor, and the end of the inner ring of the connecting bearing away from the support structure abuts against the end face of the protrusion.

[0016] In one possible implementation of this application, a second gap exists between the outer edge of the blade and the inner wall of the branch pipe along the radial direction of the branch pipe, and the size of the second gap is A3, 0 < A3 < 1 mm.

[0017] In one possible implementation of this application, the main pipeline further includes a transition section. Along the axial direction of the first pipeline, the transition section is disposed between the first pipeline and the second pipeline, with one end connected to the first pipeline and the other end connected to the second pipeline. Along the axial direction of the first pipeline, the angle between the sidewall of the first pipeline and the sidewall of the transition section is α, and 120° < α < 160°.

[0018] In one possible implementation of this application, the inner diameter of the first pipe is D1, the inner diameter of the second pipe is D2, and 1.5 ≤ D1 / D2 ≤ 4.

[0019] In one possible implementation of this application, the inner diameter of the second pipe is D2, the inner diameter of the branch pipe is D3, and D3≤D2.

[0020] In one possible implementation of this application, the device further includes a Y-shaped bracket, with the open end of the Y-shaped bracket connected to the inner wall of the branch pipe along the radial direction of the first axis; the first axis is rotatably connected to the Y-shaped bracket.

[0021] Secondly, this application provides an industrial waste gas energy harvesting system, including the industrial waste gas energy harvesting device as described in the first aspect, and an exhaust pipe for discharging industrial waste gas, wherein the exhaust end of the exhaust pipe is connected to a first pipeline.

[0022] In one possible implementation of this application, the system further includes an external circuit and a monitoring device, with the power generation module electrically connected to the monitoring device via the external circuit. Attached Figure Description

[0023] Figure 1 A partial cross-sectional view of an industrial waste gas energy harvesting device; Figure 2 This is a circuit diagram of a power management circuit. Figure 3 for Figure 1 A partial schematic diagram of the provided energy harvesting device; Figure 4 This is an exploded view of the power generation module; Figure 5 for Figure 4 A schematic diagram of the support structure for the provided power generation module; Figure 6 for Figure 4 A schematic diagram of the electrode section of the provided power generation module; Figure 7 A set of experimental data for an industrial waste gas energy harvesting system; Figure 8 This is another set of test data for an industrial waste gas energy harvesting system; Figure 9 This is a flowchart of the process for an industrial waste gas energy harvesting system.

[0024] Reference numerals: 1-Main pipeline; 11-First pipeline; 12-Second pipeline; 13-Transition section; 2-Branch pipeline; 3-Blade; 4-Power generation module; 41-Rotor; 411-Support structure; 4111-Hollowed-out part; 4112-Groove; 4113-Mounting slot; 412-Moving part; 42-Stator; 421-Electrode part; 4211-First electrode; 4212-Second electrode; 422-Friction layer; 423-Substrate; 43-Outer shell; 431-Housing shell; 4311-Protrusion; 432-Cover plate; 5-Transmission mechanism; 51-First shaft; 52-Second shaft; 53-Gear set; 6-Y-type bracket; 7-Connecting bearing. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. The same reference numerals in the figures denote the same or similar structures, and therefore repeated descriptions of them will be omitted. The terms expressing position and direction described in the embodiments of this application are illustrative based on the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this application. The accompanying drawings of the embodiments of this application are only for illustrating relative positional relationships and do not represent actual scale.

[0026] It should be noted that specific details are set forth in the following description to facilitate understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0027] Industrial waste gas pipelines typically contain low-frequency, highly fluctuating gaseous energy. This energy is continuously generated during production processes, covering typical scenarios such as refining, steelmaking, building materials, metallurgy, and waste incineration. Spatially, it permeates multiple scenarios including plant pipe networks, flues, and ventilation shafts, characterized by wide distribution, long online time, and local availability. Currently, there is a significant disconnect between waste gas energy recovery and monitoring power supply: a large amount of recoverable low-frequency gaseous energy is wasted, and monitoring nodes often rely on wiring or periodic battery replacements, making it difficult to support a dense, long-term, low-maintenance industrial process monitoring network. If on-site recovery can be achieved within or near the industrial waste gas pipeline, a stable energy source can be provided for discrete monitoring nodes, edge computing units, and field indicating equipment, reducing reliance on centralized power supply and long-distance wiring, and alleviating maintenance and upkeep pressures.

[0028] In addition, existing energy utilization technologies such as electromagnetic generators and photovoltaics often face problems such as high cost, limited efficiency, insufficient durability and harsh installation conditions under complex working conditions. Specifically, traditional electromagnetic generators are limited by starting torque and stable speed, making it difficult to work stably for a long time under low speed, intermittent and irregular airflow conditions.

[0029] In view of this, the industrial waste gas energy harvesting device provided in this application, based on the principle of air pressure difference, is used to generate induced airflow to drive the rotation of the blades, which in turn drives the rotor of the power generation module to move relative to the stator, thereby generating an alternating current signal. Furthermore, the device is connected to monitoring equipment via an external circuit so that the current generated by the power generation module is applied to the operation of the monitoring equipment, thereby achieving effective recovery and utilization of low-frequency airflow energy and improving the stability of the monitoring equipment. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] The industrial waste gas energy harvesting system provided in this application includes an industrial waste gas energy harvesting device, external circuitry, and monitoring equipment. The industrial waste gas energy harvesting device is installed on the exhaust pipe of the industrial equipment. The exhaust pipe is used to discharge industrial waste gas, and the industrial waste gas energy harvesting device is used to collect the gaseous energy generated by the waste gas and convert it into electrical energy for the operation of the monitoring equipment. Specifically, the AC signal generated by the industrial waste gas energy harvesting device can be optimized and controlled by a power management circuit, and the processed electrical energy is stored in an energy storage device to continuously power electronic equipment such as wireless thermometers, hygrometers, anemometers, and gas detection sensors.

[0031] When specifically setting up industrial waste gas energy collection devices, such as Figure 1 As shown, Figure 1 This is a partial cross-sectional view of an industrial waste gas energy harvesting device. It may include a main pipeline 1, a branch pipeline 2, blades 3, and a power generation module 4. The main pipeline 1 and the branch pipeline 2 are interconnected. The power generation module 4 is located outside the branch pipeline 2 and the main pipeline 1. The blades 3 are located inside the branch pipeline 2 and are connected to the power generation module 4 through a transmission mechanism 5.

[0032] When specifically setting up the main pipeline 1, the main pipeline 1 may include a first pipeline 11 and a second pipeline 12 that are connected, wherein the inner diameter of the first pipeline 11 is larger than the inner diameter of the second pipeline 12. And the end of the first pipeline 11 away from the second pipeline 12 is connected to the exhaust pipe of the industrial equipment, that is, the exhaust gas is discharged sequentially through the exhaust pipe, the first pipeline 11 and the second pipeline 12.

[0033] It should be noted that this application does not limit the specific dimensions of the first pipe 11 and the second pipe 12. For example, both can be straight pipes to reduce processing difficulty. Additionally, the main pipe 1 may also include a transition section 13 along the axial direction of the first pipe 11 (e.g., ...). Figure 1 (As shown in the Z-axis direction), transition section 13 is located between the first pipe 11 and the second pipe 12, with one end of transition section 13 connected to the first pipe 11 and the other end connected to the second pipe 12. Understandably, since the inner diameter of the first pipe 11 is larger than that of the second pipe 12, when exhaust gas flows from the first pipe 11 to the second pipe 12, the airflow velocity increases and the pressure decreases. That is, when low-frequency airflow flows from the first pipe 11 to the second pipe 12, the airflow frequency will also increase accordingly. Therefore, along the axial direction of the first pipe 11, the angle between the sidewall of the first pipe 11 and the sidewall of the transition section 13 can be α, where 120° < α < 160°. That is, the outer contour of the transition section 13 is frustum-shaped, with the end of the frustum with a smaller diameter connected to the second pipe 12 and the end with a larger diameter connected to the first pipe 11. This effectively reduces the risk of turbulence forming in the pipes, which helps to reduce airflow resistance.

[0034] It is worth mentioning that the inner diameter of the first pipe 11 can be defined as D1 and the inner diameter of the second pipe 12 can be defined as D2, and the inner diameters of the two pipes satisfy: 1.5≤D1 / D2≤4, in order to meet the specific requirements of airflow velocity.

[0035] In the specific configuration of branch pipe 2 and power generation module 4, branch pipe 2 can be installed on the side wall of second pipe 12, with one end of branch pipe 2 connected to second pipe 12 and the other end being an open end. Understandably, the open end of branch pipe 2 can be directly connected to the outside air. Power generation module 4 includes rotor 41 and stator 42. Specifically, blades 3 are connected to rotor 41 via transmission mechanism 5 to drive rotor 41 to rotate relative to stator 42, thereby generating an alternating current signal.

[0036] It is worth mentioning that the inner diameter of the branch pipe 2 can be limited to D3, and the inner diameter of the branch pipe 2 and the inner diameter of the second pipe 12 satisfy: D3≤D2. In this way, when induced airflow is generated in the branch pipe 2, it helps to reduce the risk of turbulence in the branch pipe 2, thereby reducing the airflow resistance and improving the efficiency of induced airflow entering the main pipe 1.

[0037] Using the industrial waste gas energy harvesting device provided in this application, since the branch pipe 2 is located on the side wall of the second pipe 12 and connected to the second pipe 12, when the gas pressure in the second pipe 12 decreases, a pressure difference is formed between the branch pipe 2 and the second pipe 12. The air in the branch pipe 2 then flows from the open end of the branch pipe 2 towards the second pipe 12, forming an induced airflow that drives the blades 3 within the branch pipe 2 to rotate. This, in turn, causes the blades 3 to drive the rotor of the power generation module 4 to rotate relative to the stator, generating a stable AC signal. The AC power generated by the power generation module 4 can also be processed by the power management circuit to continuously power external monitoring equipment, thereby achieving effective recovery and utilization of airflow energy (e.g., the airflow energy of low-frequency airflow) and improving the operational stability of the monitoring equipment.

[0038] Furthermore, since the induced airflow formed in branch pipe 2 is generated by the accelerated flow of air from the external environment towards the second pipe 12, during the exhaust gas emission process, according to the principle of air pressure difference, the clean airflow in branch pipe 2 always flows towards the main pipe 1, while the exhaust gas in the main pipe 1 flows along the first pipe 11 towards the second pipe 12. This helps reduce the risk of exhaust gas entering the energy harvesting device via branch pipe 2. Moreover, directly connecting the main pipe 1 to the exhaust pipe of the industrial equipment reduces the need for structural modifications to the exhaust pipe. In the event of a device malfunction, the device can be directly separated from the exhaust pipe, improving maintenance convenience.

[0039] It should be noted that this application does not specifically limit the power management circuit. Optionally, when specifically configuring the power management circuit, such as Figure 2 As shown, Figure 2This circuit diagram illustrates a power management circuit. The circuit includes a rectifier bridge, a gas discharge tube (GDT), diodes, an inductor, a capacitor for energy storage, a control switch (LTC3588), and an external load. When the capacitor voltage is charged to 5V, the LTC3588 chip can power low-power electronic components such as wireless thermometers, hygrometers, anemometers, and gas sensors, achieving a closed loop of in-situ energy harvesting, energy management, and in-situ sensing and monitoring. This allows the system to achieve rapid charging and discharging during operation.

[0040] In addition, the energy harvesting system provided in this application can realize the on-site recovery of low-flow exhaust gas near the end of industrial exhaust gas pipelines. It can provide stable energy for discrete monitoring nodes, edge computing units and field indicator equipment, reduce dependence on centralized power supply and long-distance wiring, and alleviate the pressure of inspection and maintenance.

[0041] In an optional implementation, when specifically configuring the transmission mechanism 5, such as... Figure 3 As shown, Figure 3 For display Figure 1 A partial schematic diagram of the provided energy harvesting device. The transmission mechanism 5 includes a first shaft 51 and a second shaft 52. The first shaft 51 extends along the open end of the branch pipe 2 toward the second pipe 12 and is connected to the second shaft 52 via a gear set 53 to simplify the transmission mechanism 5. For example, the coaxiality of the first shaft 51 and the branch pipe 2 can be O, where O satisfies: 0.02mm ≤ O ≤ 0.1mm. The gear set 53 can be a set of meshing bevel gears with a tooth flank clearance ranging from 0.1 to 0.3mm to reduce transmission resistance between mechanisms, thereby enabling the device to collect and utilize lower frequency airflow.

[0042] It should be noted that this application does not limit the angular relationship between the first shaft 51 and the second shaft 52. For example, the first shaft 51 and the second shaft 52 can be made perpendicular to each other, and one end of the second shaft 52 is located in the branch pipe 2, while the other end extends out of the branch pipe 2 and is connected to the rotor 41. The second shaft 52 is rotatably connected to the side wall of the branch pipe 2 through a bearing to further reduce the transmission resistance.

[0043] In the specific configuration of blade 3, blade 3 is positioned on the first shaft 51. Specifically, blade 3 can be located at the open end of branch pipe 2 and protrude radially from the side wall of the first shaft 51 to enhance the driving effect of the induced airflow on blade 3. Understandably, blade 3 and the first shaft 51 are fixedly connected. Furthermore, to meet the requirement of blade 3 driving the rotation of the first shaft 51, the device can also include a Y-shaped bracket. Along the radial direction of the first shaft 51, the open end of the Y-shaped bracket is connected to the inner wall of branch pipe 2, while the first shaft 51 is rotatably connected to the Y-shaped bracket. Specifically, a mounting hole can be provided at the intersection of the Y-shaped bracket. The first shaft 51 is inserted into the inner ring of the bearing, and the outer ring of the bearing is embedded in the mounting hole to achieve the rotatable connection between the first shaft 51 and the Y-shaped bracket. In addition, based on the principle of triangle stability, the Y-shaped bracket can effectively improve the internal connection reliability of the device while fulfilling the connection requirement between the first shaft 51 and branch pipe 2.

[0044] It should be noted that during the process of collecting exhaust gas energy, induced airflow will be generated in the branch pipe 2. Therefore, by setting up a Y-shaped bracket, a reliable connection between the first shaft 51 and the branch pipe 2 can be achieved while reducing the space occupied by the bracket, which helps to reduce the resistance of the bracket to the airflow.

[0045] Furthermore, this application does not limit the specific shape of the blade 3. For example, the blade 3 can be spiral or other shapes, and its material can be PLA, resin, thin metal, etc., with a thickness B satisfying: 0.3 ≤ B ≤ 1 mm. By reducing the weight of the blade 3, the effective collection and utilization of low-frequency airflow can be further improved.

[0046] It is worth mentioning that, along the radial direction of the branch pipe 2, since the blade 3 protrudes from the side wall of the first shaft 51, there is a gap between the outer edge of the blade 3 and the inner wall of the branch pipe 2. This gap is defined as the second gap, and the size of the second gap is A3, 0 < A3 < 1 mm. This helps to reduce the risk of friction between the blade 3 and the inner wall of the branch pipe 2, and the risk of the friction causing an increase in the starting velocity of the airflow that drives the blade 3 to rotate.

[0047] When specifically configuring the rotor of power generation module 4, it is optional to combine it with... Figure 1 and Figure 4 , Figure 4 This is an exploded view used to illustrate the power generation module 4. The rotor 41 may include a support structure 411 and a movable component 412. Specifically, the end of the second shaft 52 facing away from the first shaft 51 may be connected to the support structure 411, while the movable component 412 is disposed on the support structure 411. In the specific configuration of the support structure 411, optional features include... Figure 5 As shown, Figure 5 Used to display along the positive Z-axis. Figure 4A schematic diagram of a support structure 411 for the provided power generation module 4. The support structure 411 may include multiple hollow portions 4111 and multiple grooves 4112, with the hollow portions 4111 and grooves 4112 alternately arranged along the circumference of the second axis 52. Specifically, the support structure 411 can be configured as a disc, with grooves 4112 provided on the disc along its axial direction, and the direction from the groove opening to the bottom of the groove 4112 being the direction from the stator 42 to the rotor 41 (e.g.,...). Figure 4 (As shown in the positive Z-axis direction), and the hollowed-out portion 4111 is located between two adjacent grooves 4112. Additionally, a mounting hole is provided at the center of the disc, into which the second shaft 52 is inserted, simplifying the device structure while connecting the second shaft 52 to the support structure 411. The movable member 412 can be disposed within the groove 4112, allowing the groove 4112 to limit the movement of the movable member 412.

[0048] It is worth mentioning that the rotor 41 may include multiple moving parts 412, which are distributed within multiple grooves 4112 and cover at least part of the bottom of the grooves 4112. This allows each groove 4112 to be filled with moving parts 412, or only part of the grooves 4112 to be filled with moving parts 412, thereby improving the power generation efficiency of the device. Furthermore, when the grooves 4112 are filled with moving parts 412, the outermost moving part 412 abuts against the sidewall of the groove 4112, and adjacent moving parts 412 abut against each other. This helps to improve the response speed of the moving parts 412 during the rotation of the rotor 41.

[0049] In addition, the hollowed-out portion 4111 on the support structure 411 can reduce the weight of the support structure 411, thereby effectively reducing the starting flow velocity of the airflow used to drive the movement of the blade 3 and the moving part 412.

[0050] It should be noted that this application does not limit the specific structure of the moving part 412. The moving part 412 can be an example of a small ball, and its material can be polyoxymethylene (POM), ethyl cellulose, nylon, copper, aluminum, etc., to reduce the friction between the moving part 412 and the stator 42 and improve the response speed of the moving part 412.

[0051] In the specific configuration of the stator 42 structure, the stator 42 includes an electrode portion 421 and a friction layer 422. Along the axial direction of the second axis 52, the friction layer 422 is disposed on the surface of the electrode portion 421 facing the support structure 411, and the moving member 412 is used to contact and rub against the friction layer 422, so as to realize that the electrode portion 421 generates an alternating current signal while simplifying the structure of the stator 42.

[0052] It is worth mentioning that, along the axial direction of the second axis 52, a gap can be created between the bottom of the groove 4112 and the friction layer 422. This gap is defined as a first gap, and the size of the first gap is A1. The aforementioned moving member 412 is located within the first gap. Furthermore, along the axial direction of the second axis 52, the size of the moving member 412 is defined as A2, such that A2 < A1. This ensures that when the axial direction of the second axis 52 of the power generation device is aligned with the direction of gravity, the moving member 412 remains in contact with the friction layer 422 and separates from the bottom of the groove 4112. This effectively reduces the risk of increased starting velocity of the airflow used to drive the moving member 412 due to friction generated from contact between the moving member 412 and the bottom of the groove 4112.

[0053] When specifically configuring the electrode section 421, optional options can be referenced as well. Figure 4 and Figure 6 , Figure 6 For display Figure 4 A schematic diagram of the electrode section 421 of the provided power generation module 4 is shown. The electrode section 421 includes a plurality of first electrodes 4211 and a plurality of second electrodes 4212, which are alternately arranged along the circumferential direction of the second axis 52, with gaps between them. Specifically, when the support structure 411 of the rotor 41 is a disc structure, the stator 42 can also be a disc structure. The stator 42 can also include a substrate 423, which can be, for example, a plate structure formed of an insulating rigid material such as acrylic, fiberglass, or PET board. Along the axial direction of the second axis 52, the electrode section 421 is disposed on the surface of the substrate 423 facing the rotor 41 to improve the stability of the electrode section 421. It is worth mentioning that by making the first electrode 4211 the positive electrode and the second electrode 4212 the negative electrode, and by connecting multiple first electrodes 4211 in parallel with multiple second electrodes 4212 in parallel with wires, and by making the width of the groove 4112 less than or equal to the width of the first electrode 4211 along the circumference of the second axis 52, when multiple or single moving parts 412 fill the groove 4112, the projection of multiple or single moving parts 412 located in a single groove 4112 toward the first electrode 4211 will fall completely into the first electrode 4211. In this way, when the rotor 41 rotates relative to the stator 42, it is beneficial to improve the current stability between the first electrode 4211 and the second electrode 4212.

[0054] In addition, the friction layer 422 is configured as a membrane structure, and its material can be, for example, polytetrafluoroethylene (PTFE), polyimide (Kapton), polyvinyl chloride (PVC), perfluoroethylene propylene copolymer (FEP), etc.

[0055] In one alternative implementation, reference is also made to Figure 1 , Figure 4 and Figure 5 The power generation module 4 may also include a housing 43, in which the rotor 41 and stator 42 are both disposed within the housing 43. Specifically, the housing 43 may include a snap-fit ​​shell 431 and a cover plate 432, and the second shaft 52 of the transmission mechanism 5 passes through the cover plate 432 and is connected to the rotor 41. It is worth mentioning that the support structure 411 is provided with a mounting groove 4113, and a connecting bearing 7 is embedded in the mounting groove 4113. That is, the outer ring of the connecting bearing 7 is fixedly connected to the side wall of the mounting groove 4113 of the support structure 411. For example, the mounting groove 4113 and the second shaft 52 can be coaxially arranged. In addition, along the axial direction of the second shaft 52, the height of the connecting bearing 7 is greater than the height of the support structure 411. Along the axial direction of the second shaft 52, the housing 431 of the outer shell 43 is provided with a protrusion 4311 facing the rotor 41. That is, the protrusion 4311 is provided on the bottom wall of the housing 431. The protrusion 4311 is stepped, that is, it includes a small diameter section and a large diameter section in sequence along the axial direction. The large diameter section is provided on the bottom wall of the housing 431, and the small diameter section is provided on the end face of the large diameter section away from the bottom wall of the housing 431. The small diameter section is inserted into the inner ring of the connecting bearing 7, and the end of the inner ring of the connecting bearing 7 away from the support structure 411 abuts against the end face of the large diameter section. This is to achieve effective rotation of the support structure 411 relative to the stator 42, while the friction layer 422 of the support structure 411 and the stator 42 is spaced apart to avoid the two from contacting each other and generating friction.

[0056] It should be noted that through holes can be provided on the stator 42, and the portion of the connecting bearing 7 protruding from the support structure 411 passes through the through hole and abuts against the protrusion 4311 of the housing 431 to meet the connection requirements. Understandably, the height of the portion of the connecting bearing 7 protruding from the support structure 411 is greater than the thickness of the stator to meet the requirement of the friction layer 422 of the support structure 411 and the stator 42 being spaced apart. Furthermore, this application does not specifically limit the material of the housing 43; for example, high-performance materials such as corrosion-resistant and high-temperature-resistant materials, such as copper-aluminum alloy, stainless steel, and nylon, can be selected. It is worth mentioning that the main pipeline 1 and branch pipeline 2 can also use the above-mentioned materials to extend the service life of the pipelines.

[0057] In addition, the housing 43 of the power generation module 4 can be connected to the side wall of the branch pipe 2 via a bracket. For example, the connection between the housing 43 and the bracket, and between the bracket and the branch pipe 2, can be tenon joint, adhesive connection, welding, riveting, etc., to improve the reliability of the device.

[0058] After a detailed understanding of the structure of the exhaust gas energy harvesting system, in a specific embodiment, for example, the height of the main pipeline 1 along the axial direction of the main pipeline 1 can be 600 mm, the inner diameter of the first pipeline 11 is 200 mm, the inner diameter of the second pipeline 12 is 110 mm, and the angle between the side wall of the transition section 13 and the side wall of the first pipeline 11 is 164°, and the length of the branch pipeline 2 is 300 mm, with an inner diameter of 110 mm.

[0059] Meanwhile, for example, the outer contour of the blade 3 can have a diameter of 108 mm and a thickness of 1.2 mm, and the electrode portion 421 can have a thickness of 1.5 mm and a diameter of 170 mm, wherein the FEP film has a thickness of 30 μm, and the spheres are POM spheres with a diameter of 4 mm. Figure 7 As shown, Figure 7 A set of experimental data was used to demonstrate this implementation. At a flow rate of 4 m / s, the power generation module 4 can generate a voltage of 2.46 kV, a short-circuit current of 5.48 μA, and a transferred charge of approximately 165 nC, exhibiting good durability. Furthermore, the starting torque of the blades 3 and the small ball can be as low as 0.7 N·cm, and the starting flow rate can be as low as 1.1 m / s, specifically as follows... Figure 8 As shown, Figure 8 This is used to display relevant data on the open-circuit voltage, short-circuit current, and transferred charge of the power generation module 4 at a flow rate of 1.1 m / s.

[0060] In summary, the industrial waste gas energy harvesting device provided in this application, because the branch pipe 2 is located on the side wall of the second pipe 12 and connected to the second pipe 12, creates a pressure difference between the branch pipe 2 and the second pipe 12 when the gas pressure in the second pipe 12 decreases. This causes the air in the branch pipe 2 to flow from its open end towards the second pipe 12, forming an induced airflow that drives the blades 3 within the branch pipe 2 to rotate. This, in turn, causes the blades 3 to drive the rotor 41 of the power generation module 4 to rotate relative to the stator 42, generating a stable AC signal. The AC power generated by the power generation module 4 can also be processed by the power management circuit to continuously power external monitoring equipment, thereby achieving effective recovery and utilization of airflow energy (e.g., the airflow energy of low-frequency airflow) and improving the operational stability of the monitoring equipment.

[0061] In addition, since the induced airflow formed in the branch pipe 2 is formed by the accelerated flow of air in the external environment toward the second pipe 12, during the exhaust process, according to the principle of air pressure difference, the clean airflow in the branch pipe 2 always flows toward the main pipe 1, while the exhaust gas in the main pipe 1 flows along the first pipe 11 toward the second pipe 12. This helps to reduce the risk of exhaust gas entering the energy collection device through the branch pipe 2.

[0062] Specifically, during the process of industrial waste gas flowing through main pipeline 1, such as Figure 9 As shown, induced airflow is generated within branch pipe 2. Driven by this induced airflow, blade 3 begins to rotate the first shaft 51. The rotation of the first shaft 51 is converted into the rotation of the second shaft 52 via a bevel gear. The second shaft 52 drives the rotor 41 to rotate, which in turn drives the POM ball to roll on the FEP membrane. Under the coupling effect of triboelectric charging and electrostatic induction, the first electrode 4211 and the second electrode 4212 will output an AC signal. After power management, the AC power is controlled by the LTC3588 to power the electronic components, realizing a closed loop of in-situ energy harvesting and supply.

[0063] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. An industrial exhaust gas energy harvesting device, characterized by, The device comprises a main pipe, a branch pipe, a blade and a power generation module, the blade is located inside the branch pipe, and the power generation module is located outside the branch pipe and the main pipe. The main pipe comprises a first pipe and a second pipe in communication, the inner diameter of the first pipe is larger than that of the second pipe. The branch pipe is arranged on the side wall of the second pipe, and one end thereof is in communication with the second pipe and the other end is an open end. The power generation module comprises a rotor and a stator, the blade is connected with the rotor through a transmission mechanism, and is used to drive the rotor to rotate relative to the stator to generate an alternating current signal.

2. The industrial exhaust gas energy harvesting device of claim 1, wherein, The transmission mechanism comprises a first shaft and a second shaft, the first shaft extends along the open end of the branch pipe towards the second pipe, and is in transmission connection with the second shaft through a gear set; the blade is arranged on the first shaft. Along the axial direction of the second shaft, one end of the second shaft away from the first shaft penetrates through the side wall of the branch pipe and is connected with the rotor; the second shaft is in rotational connection with the side wall of the branch pipe.

3. The industrial exhaust gas energy harvesting device of claim 2, wherein, The rotor comprises a support structure and a moving piece, one end of the second shaft away from the first shaft is connected with the support structure, and the moving piece is arranged on the support structure. The stator comprises an electrode part and a friction layer, along the axial direction of the second shaft, the friction layer is arranged on the surface of the electrode part towards the support structure. The moving piece is used to contact and rub with the friction part, and the electrode part is used to generate an alternating current signal.

4. The industrial exhaust gas energy harvesting device of claim 3, wherein, The support structure further comprises a plurality of hollow parts and a plurality of grooves, along the circumferential direction of the second shaft, the hollow parts and the grooves are arranged alternately. The rotor comprises a plurality of moving pieces, and the plurality of moving pieces are arranged in the plurality of grooves and cover at least part of the groove bottom of the grooves.

5. The industrial exhaust gas energy harvesting device of claim 4, wherein, The electrode part comprises a plurality of first electrodes and a plurality of second electrodes, along the circumferential direction of the second shaft, the plurality of first electrodes and the plurality of second electrodes are arranged alternately and have a gap therebetween. Along the circumferential direction of the second shaft, the width of the groove is less than or equal to the width of the first electrode.

6. The industrial exhaust gas energy harvesting device of claim 3, wherein, The support structure comprises a groove, along the axial direction of the second shaft, there is a first gap between the groove bottom of the groove and the friction layer, and the size of the first gap is A1, and the moving piece is located in the first gap. Along the axial direction of the second shaft, the size of the moving piece is A2, and A2 7. The industrial exhaust gas energy harvesting device of claim 6, wherein, Along the axial direction of the second shaft, the support structure and the friction layer are arranged alternately.

8. The industrial exhaust gas energy harvesting device of claim 7, wherein, The device further comprises a housing and a connecting bearing, the stator and the rotor are located in the housing, and part of the connecting bearing is embedded in the support structure. Along the axial direction of the second shaft, the connecting bearing protrudes from the surface of the support structure towards the stator. Along the axial direction of the second shaft, the housing is provided with a protrusion in the direction towards the rotor, and the end of the inner ring of the connecting bearing away from the support structure abuts against the end surface of the protrusion.

9. The industrial exhaust gas energy harvesting device of claim 1, wherein, Along the radial direction of the branch pipe, there is a second gap between the outer edge of the blade and the inner wall of the branch pipe, and the size of the second gap is A3, 0 10. The industrial exhaust gas energy harvesting device of claim 1, wherein, The main pipeline further comprises a transition section, which is arranged between the first pipeline and the second pipeline along the axial direction of the first pipeline, and one end of which communicates with the first pipeline and the other end of which communicates with the second pipeline; The included angle between the side wall of the first pipeline and the side wall of the transition section along the axial direction of the first pipeline is α, and 120° < α < 160°.

11. The industrial exhaust gas energy harvesting device of claim 10, wherein, The inner diameter of the first pipeline is D1, the inner diameter of the second pipeline is D2, and 1.5 ≤ D1 / D2 ≤ 4.

12. The industrial exhaust gas energy harvesting device of claim 1, wherein, The inner diameter of the second pipeline is D2, and the inner diameter of the branch pipeline is D3, and D3 ≤ D2.

13. The industrial exhaust gas energy harvesting device of claim 2, wherein, The device further comprises a Y-shaped support, and an open end of the Y-shaped support is connected with the inner wall of the branch pipeline along the radial direction of the first shaft; the first shaft is rotationally connected with the Y-shaped support.

14. An industrial exhaust gas energy harvesting system characterized by, The system comprises the industrial waste gas energy collection device according to any one of claims 1-13, and an exhaust pipe for discharging industrial waste gas, wherein: The exhaust end of the exhaust pipe communicates with the first pipeline.

15. The industrial exhaust gas energy harvesting system of claim 14, wherein, The system further comprises an external circuit and a monitoring device, and the power generation module is electrically connected with the monitoring device through the external circuit.

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