System for generating power by utilizing kinetic energy of boiler flue gas

Abstract

The invention provides a system for generating power by utilizing boiler flue gas kinetic energy, which comprises a supporting beam, a flow collecting shell, a flue gas energy capturing power generation unit and an energy storage unit, and is characterized in that the flow collecting shell is mounted above a top outlet of a chimney through the supporting beam; the flow collecting shell is in a hyperbolic curve shape; the flue gas energy capturing power generation unit comprises a fixed frame and a power generation body, the power generation body comprises a vortex generation body, a piezoelectric plate and an elastic substrate, and the fixed frame is fixed to the current collecting shell; the vortex generating body is arranged in the smoke flowing direction, the bottom of the vortex generating body is fixed to the fixing frame, a groove is formed in the tail of the vortex generating body, the front end of the elastic base plate is embedded in the groove, and the two piezoelectric plates are arranged on the two opposite sides of the elastic base plate respectively. One technical effect of the invention is that the kinetic energy of the flue gas discharged by the chimney can be effectively converted into electric energy.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal power generation, and in particular relates to a system for generating electricity by utilizing the kinetic energy of boiler flue gas. Background Art

[0002] Taking a coal-fired power plant as an example, after the coal particles are crushed into coal powder by a pulverizer, they are transported to the burner by primary air and mixed with preheated air before being sprayed into the boiler furnace for combustion. The flue gas generated by combustion is usually purified by a denitrification system, a dust removal system, and a desulfurization system before being directly discharged into the atmosphere through a chimney. When the boiler runs continuously, a huge amount of flue gas will be generated. If the flue gas energy can be recycled, considerable benefits will be generated.

[0003] Therefore, there is an urgent need for a system that utilizes the kinetic energy of boiler flue gas to generate electricity in order to realize the resource utilization of flue gas energy. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art and provide a new technical solution for a system for generating electricity using the kinetic energy of boiler flue gas.

[0005] According to a first aspect of the present invention, there is provided a system for generating electricity using kinetic energy of boiler flue gas, comprising a support beam, a current collecting shell, a flue gas energy capturing power generation unit and an energy storage unit, wherein the current collecting shell is installed above the top outlet of the chimney through the support beam; wherein the flue gas energy capturing power generation unit is electrically connected to the energy storage unit;

[0006] The current collecting shell is in a hyperbolic shape, the bottom inlet area of ​​the current collecting shell is not less than the top outlet area of ​​the chimney, and the top outlet area of ​​the current collecting shell is less than the bottom inlet flow area of ​​the current collecting shell;

[0007] The flue gas energy capture power generation unit is arranged on the inner side of the middle part of the current collecting shell, and the flue gas energy capture power generation unit includes a fixed frame and a power generation body, and the power generation body includes a vortex generating body, a piezoelectric sheet and an elastic substrate, and the fixed frame is fixed to the current collecting shell; the vortex generating body is arranged along the flow direction of the flue gas, and the bottom of the vortex generating body is fixed to the fixed frame, and a groove is arranged at the tail of the vortex generating body, and the front end of the elastic substrate is embedded in the groove, and the two piezoelectric sheets are respectively arranged on opposite sides of the elastic substrate;

[0008] When the flue gas flows in the collecting shell and passes through the vortex generator, a detached vortex is formed on the upper part of the vortex generator. During the detachment process of the detached vortex, the periodically changing pulsating force acts on the piezoelectric sheet and causes the piezoelectric sheet to deform, so that the kinetic energy of the flue gas is converted into electrical energy under the action of the piezoelectric effect and stored in the energy storage unit.

[0009] Optionally, the energy storage unit is arranged outside the middle part of the current collecting shell.

[0010] Optionally, the energy storage unit includes a ring-shaped tray and a battery pack;

[0011] The annular tray is sleeved on the outer side of the middle part of the current collecting shell, and a plurality of battery packs are placed in the annular tray along the circumference of the current collecting shell.

[0012] Optionally, the system for generating electricity using boiler flue gas kinetic energy further comprises a tray support;

[0013] The tray support is disposed on the outer wall of the current collecting housing along the circumferential direction. The tray support is located below the annular tray and is used to support the annular tray.

[0014] Optionally, the fixed frame includes a plurality of mutually parallel cross beams, two ends of the cross beams are respectively fixed to the current collecting shell, and a plurality of the power generating bodies are arranged at intervals on each of the cross beams.

[0015] Optionally, the number of the cross beams is 4, 5 of the power generators are arranged on the cross beam located in the middle, and 4 of the power generators are arranged on the cross beam located at the side.

[0016] Optionally, the power generating bodies on adjacent beams are staggered.

[0017] Optionally, the two flue gas energy capture power generation units are arranged on the inner side of the middle part of the collecting shell along the up-down direction.

[0018] Optionally, the vortex generator is welded to the fixed frame, and the upper end surface of the elastic base is higher than the upper end surface of the piezoelectric sheet.

[0019] Optionally, the system for generating electricity using boiler flue gas kinetic energy further comprises a transmission line group;

[0020] The flue gas energy capture power generation unit is electrically connected to the energy storage unit through the transmission line group.

[0021] A technical effect of the present invention is:

[0022] In the embodiment of the present application, the system for generating electricity using the kinetic energy of boiler flue gas has a simple and reasonable structural design, has no rotating parts, and has high reliability; it can effectively recycle the kinetic energy of flue gas emitted from the chimney and convert it into usable electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of a system for generating electricity using kinetic energy of boiler flue gas according to an embodiment of the present invention;

[0024] Figure 2It is a cross-sectional schematic diagram of a system for generating electricity using kinetic energy of boiler flue gas according to one embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the distribution of power generating bodies in a system for generating electricity using kinetic energy of boiler flue gas according to an embodiment of the present invention;

[0026] Figure 4 This is a schematic structural diagram of a power generating body of a system for generating electricity using kinetic energy of boiler flue gas according to an embodiment of the present invention;

[0027] Figure 5 The present invention is a schematic diagram of the working principle of a power generator of a system for generating electricity using the kinetic energy of boiler flue gas according to an embodiment of the present invention.

[0028] In the figure: 1. chimney; 2. collector shell; 3. tray bracket; 4. ring tray;

[0029] 5. Support beam; 6. Battery pack; 7. Fixed frame; 8. Flue gas; 9. Generator;

[0030] 10. Vortex generator; 11. Piezoelectric sheet; 12. Elastic substrate; 13. Transmission line group. DETAILED DESCRIPTION

[0031] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0032] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0033] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] According to one aspect of the present invention, see Figures 1 to 5 , provides a system for generating electricity using the kinetic energy of boiler flue gas, which enables the flue gas discharged from a thermal power plant to be effectively utilized.

[0037] Specifically, the system for generating electricity by utilizing the kinetic energy of boiler flue gas comprises a support beam 5, a current collecting shell 2, a flue gas energy capturing power generation unit and an energy storage unit, wherein the current collecting shell 2 is installed above the top outlet of the chimney 1 through the support beam 5; wherein the flue gas energy capturing power generation unit is electrically connected to the energy storage unit;

[0038] The collector housing 2 is in a hyperbolic shape, and the bottom inlet area of ​​the collector housing 2 is not less than the top outlet area of ​​the chimney 1. Exemplarily, the bottom inlet area of ​​the collector housing 2 is substantially the same as the top outlet area of ​​the chimney 1; the top outlet area of ​​the collector housing 2 is smaller than the bottom inlet flow area of ​​the collector housing 2;

[0039] The flue gas energy capture power generation unit is arranged on the inner side of the middle part of the current collecting shell 2, and the flue gas energy capture power generation unit includes a fixed frame 7 and a power generation body 9, and the power generation body 9 includes a vortex generating body 10, a piezoelectric sheet 11 and an elastic substrate 12, and the fixed frame 7 is fixed to the current collecting shell 2; the vortex generating body 10 is arranged along the flow direction of the flue gas 8, and the bottom of the vortex generating body 10 is fixed to the fixed frame 7, and the tail of the vortex generating body 10 is provided with a groove, and the front end of the elastic substrate 12 is embedded in the groove, and the two piezoelectric sheets 11 are respectively arranged on the opposite sides of the elastic substrate 12, that is, the two piezoelectric sheets 11 are respectively installed on the two sides of the elastic substrate 12 with a larger area;

[0040] When the flue gas 8 flows in the collecting shell 2 and passes through the vortex generator 10, a detached vortex is formed on the upper part of the vortex generator 10. During the detachment process of the detached vortex, the periodically changing pulsating force acts on the piezoelectric sheet 11 and causes the piezoelectric sheet 11 to deform, so that the kinetic energy of the flue gas 8 is converted into electrical energy under the action of the piezoelectric effect and stored in the energy storage unit.

[0041] In the embodiment of the present application, the system for generating electricity using the kinetic energy of boiler flue gas has a simple and reasonable structural design, has no rotating parts, and has high reliability; it can effectively recycle the kinetic energy of the flue gas 8 emitted from the chimney 1 and convert it into usable electrical energy.

[0042] It should be noted that the flow around a blunt body is a very common physical phenomenon in nature. In fluid mechanics, it refers to the flow phenomenon when a fluid bypasses a relatively large object that is stationary or moves slowly compared to the incoming flow speed. The object is the blunt body. Under a certain flow rate, when the fluid flows around the blunt body, due to the resistance of the blunt body surface, the fluid will produce vortices on the back of the blunt body that alternately fall off the surface of the blunt body, forming a vortex shedding phenomenon. This shedding will cause the blunt body to be subjected to periodic lateral forces.

[0043] When the bluff body is fixed in an elastically supported manner or elastic deformation is allowed to occur, the force will cause periodic vibration of the bluff body, and vortex-induced vibration will occur under certain conditions. In actual engineering, when the vortex shedding frequency is close to the natural frequency of the structure, the structure is in a resonant state. This resonance can cause violent vibration or even damage to the structure. The piezoelectric effect is also a physical phenomenon, which refers to the fact that when a piezoelectric material is subjected to mechanical stress (such as compression or stretching), the center of positive and negative charges inside the material shifts, resulting in polarization at both ends of the material and charges on the surface. These charges are collected through electrodes in contact with the piezoelectric sheet 11 and can be used for power supply or charging.

[0044] This application will be able to combine vortex-induced vibration and piezoelectric effect, so that the kinetic energy of flue gas 8 emitted by the chimney 1 can be converted into considerable power electrical energy, which has good application prospects and is of certain significance to the green transformation and economic improvement of thermal power plants.

[0045] In the embodiment of the present application, when the mixed flue gas 8 flows laterally around the vortex generator 10 of the flue gas energy capture and power generation unit, due to the viscosity of the mixed flue gas 8, boundary layer separation will occur during the flow, and a detached vortex will be formed behind the vortex generator 10 (that is, the upper part of the vortex generator 10). During the vortex shedding process, the periodically changing pulsating force will act on the piezoelectric sheet 11 on the leeward side of the vortex generator 10, thereby causing the piezoelectric sheet 11 to deform. On the other hand, when the vortex generator 10 vibrates, the piezoelectric sheet 11 will move along the elastic substrate 12 in a direction perpendicular to the flow direction of the flue gas 8 (on both sides of the elastic substrate 12 with a larger area). Since the elastic substrate 12 is active, the piezoelectric sheet 11 will produce a greater deformation, and then the kinetic energy of the flue gas 8 will be converted into electrical energy through the piezoelectric effect. On the other hand, since one flue gas energy capture power generation unit is arranged at the point with the smallest flow area in the collecting shell 2 and is located above another flue gas energy capture power generation unit, the intensity of its incoming mixed flue gas 8 will be enhanced. When the mixed flue gas 8 flows through the flue gas energy capture power generation unit below, a strong tail turbulence will be generated, further aggravating the turbulence of the mixed flue gas 8. When the turbulent mixed flue gas 8 at the tail of the flue gas energy capture power generation unit below flows transversely around the vortex generator 10 in the flue gas energy capture power generation unit above, boundary layer separation will also occur during the flow due to the viscosity of the fluid, and a vortex generator 10 will be formed behind the vortex generator 10. In the process of vortex shedding, the periodically changing pulsating force will act on the piezoelectric sheet 11 on the leeward side of the vortex generator 10, causing the piezoelectric sheet 11 to deform more greatly. On the other hand, when the vortex generator 10 vibrates, the piezoelectric sheet 11 will move along the elastic substrate 12 in a direction perpendicular to the flow direction of the flue gas 8 (on both sides of the elastic substrate 12 with a larger area). Since the elastic substrate 12 is active and the disturbing effect of the incoming flue gas 8 is enhanced at this time, the piezoelectric sheet 11 will deform more greatly, and then the kinetic energy of the flue gas 8 will be converted into more electrical energy through the piezoelectric effect.

[0046] It should be added that the upper and lower sides of each piezoelectric sheet 11 are respectively connected to electrode lead wires, which are then connected to the transmission line group 13. The electric energy is output to the battery pack 6 through the holes opened on the wall of the collector shell 2. The battery pack 6 is equipped with a protection system. When the electric energy is sufficient, the operating personnel are reminded to replace the new battery pack 6 for charging.

[0047] Exemplarily, the height of the outer wall of the annular tray 4 is higher than the height of the battery pack 6, and the battery pack 6 is fixed in the annular tray 4 by a metal frame, and the tray bracket 3 is circumferentially arranged along the outer wall of the current collecting shell 2 to firmly fix the annular tray 4 on the outer wall of the current collecting shell 2.

[0048] See also Figure 2 and Figure 5 Since the flow area in the upper and middle part of the collecting shell 2 is the smallest, when the flue gas 8 flows out of the chimney 1, since there is a certain distance between the collecting shell 2 and the top outlet of the chimney 1 in the vertical direction, the air around the chimney 1 will be affected by the chimney 1 effect, and will flow in through the gap between the top of the chimney 1 and the bottom of the collecting shell 2, and continue to flow upward in the collecting shell 2 after mixing with the flue gas 8. The influx of air increases the flow rate of the fluid in the collecting shell 2 on the one hand, and can also cool the flue gas 8 discharged from the chimney 1 through mixing on the other hand, thereby reducing the influence of the temperature of the flue gas 8 on the system components.

[0049] Furthermore, due to the special external structure of the collector shell 2, when the flue gas 8 after mixing with the air and cooling flows through the smallest flow area in the collector shell 2, the flow velocity will be increased, and a flue gas energy capture power generation unit is set at this position, and another flue gas energy capture power generation unit is set below the flue gas energy capture power generation unit. The fixed frames 7 of the two flue gas energy capture power generation units are each provided with 4 cross beams, and each power generation body 9 is vertically installed on the cross beams of the two flue gas energy capture power generation units along the flow direction of the flue gas 8, and the long side of the vortex generator 10 is perpendicular to the incoming flow direction.

[0050] Optionally, the energy storage unit is arranged outside the middle of the current collecting housing 2. This helps to achieve the stability of the electrical connection between the flue gas energy capture power generation unit and the energy storage unit.

[0051] Optionally, the energy storage unit includes a ring tray 4 and a battery pack 6;

[0052] The annular tray 4 is sleeved on the outer side of the middle portion of the current collecting housing 2 , and the plurality of battery packs 6 are placed in the annular tray 4 along the circumference of the current collecting housing 2 .

[0053] In the above embodiment, the structural design of the energy storage unit is relatively reasonable, which helps to firmly fix the battery pack 6.

[0054] Optionally, the system for generating electricity using boiler flue gas kinetic energy further includes a tray support 3;

[0055] The tray support 3 is disposed on the outer wall of the current collecting housing 2 along the circumferential direction. The tray support 3 is located below the annular tray 4 and is used to support the annular tray 4 .

[0056] In the above embodiment, the tray support 3 can firmly fix the annular tray 4 on the outer wall of the current collecting housing 2 .

[0057] Optionally, the fixed frame 7 includes a plurality of mutually parallel beams, both ends of which are respectively fixed to the current collecting housing 2, and a plurality of the power generating bodies 9 are arranged at intervals on each beam. This helps to fully utilize the space inside the current collecting housing 2, helps to arrange more power generating bodies 9, and thus better improves the power generation efficiency.

[0058] Optionally, the number of the cross beams is 4, 5 power generators 9 are arranged on the cross beam located in the middle, and 4 power generators 9 are arranged on the cross beam located at the side. This makes the arrangement of the power generators 9 more reasonable.

[0059] Optionally, the power generating bodies 9 on adjacent beams are arranged in a staggered manner, which helps the flue gas 8 to flow through the gaps between the power generating bodies 9 and helps the power generating bodies 9 to generate electricity.

[0060] Optionally, two of the flue gas energy capture power generation units are arranged in the up-down direction on the inner side of the middle part of the current collecting shell 2. This makes the arrangement of the flue gas energy capture power generation units more reasonable and helps to improve the power generation efficiency.

[0061] Optionally, the vortex generator 10 is welded to the fixed frame 7 , and the upper end surface of the elastic substrate is higher than the upper end surface of the piezoelectric sheet 11 , which helps to ensure the stability of the vortex generator 10 .

[0062] Optionally, the system for generating electricity using boiler flue gas kinetic energy further comprises a transmission line group 13; the flue gas energy capture power generation unit is electrically connected to the energy storage unit via the transmission line group 13. This makes the electrical connection between the flue gas energy capture power generation unit and the energy storage unit more stable.

[0063] In one embodiment, holes are opened on the wall of the current collecting shell 2, and the transmission line group 13 transmits the electric energy generated by the flue gas energy capture power generation unit to the energy storage unit through the holes on the wall of the current collecting shell 2.

[0064] Exemplarily, the outside of the power transmission line group 13 is covered with a material having good heat insulation and corrosion resistance, and the fixing frame 7 is configured to be a metal that has been treated for corrosion resistance.

[0065] In the embodiment of the present application, the technical effects of the system for generating electricity using the kinetic energy of boiler flue gas are as follows:

[0066] 1. It can utilize piezoelectric effect and vortex-induced vibration to convert the kinetic energy of the flue gas 8, which has a huge amount of boiler emissions, into electrical energy.

[0067] 2. The hyperbolic collecting shell 2 converges the flue gas 8 emitted from the chimney 1 and prevents the external ambient air flow from affecting the flow of the flue gas 8. The flow area in the middle and upper parts is the smallest, thereby increasing the flow rate of the flue gas 8, and a two-stage flue gas energy capture power generation unit is set, which greatly improves the power generation capacity of the system.

[0068] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A system for generating electricity using the kinetic energy of boiler flue gas, characterized in that: It includes a support beam, a current collecting shell, a flue gas energy capturing power generation unit and an energy storage unit, wherein the current collecting shell is installed above the top outlet of the chimney through the support beam; wherein the flue gas energy capturing power generation unit is electrically connected to the energy storage unit; The current collecting shell is in a hyperbolic shape, the bottom inlet area of ​​the current collecting shell is not less than the top outlet area of ​​the chimney, and the top outlet area of ​​the current collecting shell is less than the bottom inlet flow area of ​​the current collecting shell; The flue gas energy capture power generation unit is arranged on the inner side of the middle part of the current collecting shell, and the flue gas energy capture power generation unit includes a fixed frame and a power generation body, and the power generation body includes a vortex generating body, a piezoelectric sheet and an elastic substrate, and the fixed frame is fixed to the current collecting shell; the vortex generating body is arranged along the flow direction of the flue gas, and the bottom of the vortex generating body is fixed to the fixed frame, and a groove is arranged at the tail of the vortex generating body, and the front end of the elastic substrate is embedded in the groove, and the two piezoelectric sheets are respectively arranged on opposite sides of the elastic substrate; When the flue gas flows in the collecting shell and passes through the vortex generator, a detached vortex is formed on the upper part of the vortex generator. During the detachment process of the detached vortex, the periodically changing pulsating force acts on the piezoelectric sheet and causes the piezoelectric sheet to deform, so that the kinetic energy of the flue gas is converted into electrical energy under the action of the piezoelectric effect and stored in the energy storage unit.

2. The system for generating electricity using boiler flue gas kinetic energy according to claim 1, characterized in that: The energy storage unit is arranged outside the middle part of the current collecting shell.

3. The system for generating electricity using boiler flue gas kinetic energy according to claim 2, characterized in that: The energy storage unit includes a ring-shaped tray and a battery pack; The annular tray is sleeved on the outer side of the middle part of the current collecting shell, and a plurality of battery packs are placed in the annular tray along the circumference of the current collecting shell.

4. The system for generating electricity using boiler flue gas kinetic energy according to claim 3, characterized in that: Also includes tray stand; The tray support is disposed on the outer wall of the current collecting housing along the circumferential direction. The tray support is located below the annular tray and is used to support the annular tray.

5. The system for generating electricity using boiler flue gas kinetic energy according to claim 1, characterized in that: The fixed frame includes a plurality of mutually parallel cross beams, both ends of which are respectively fixed to the current collecting housing, and a plurality of the power generating bodies are arranged at intervals on each of the cross beams.

6. The system for generating electricity using boiler flue gas kinetic energy according to claim 5, characterized in that: The number of the cross beams is 4, 5 of the power generators are arranged on the cross beam located in the middle, and 4 of the power generators are arranged on the cross beam located at the side.

7. The system for generating electricity using boiler flue gas kinetic energy according to claim 5, characterized in that: The power generating bodies on the adjacent beams are arranged in a staggered manner.

8. The system for generating electricity using boiler flue gas kinetic energy according to claim 1, characterized in that: The two flue gas energy capture power generation units are arranged on the inner side of the middle part of the current collecting shell along the up-down direction.

9. The system for generating electricity using boiler flue gas kinetic energy according to claim 1, characterized in that: The vortex generator is welded to the fixed frame, and the upper end surface of the elastic substrate is higher than the upper end surface of the piezoelectric sheet.

10. The system for generating electricity using boiler flue gas kinetic energy according to claim 1, characterized in that: Also included are transmission line groups; The flue gas energy capture power generation unit is electrically connected to the energy storage unit through the transmission line group.

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