A power generation device and a power generation method based on gas-liquid two-phase flow

Abstract

This invention relates to a power generation device and method based on gas-liquid two-phase flow, comprising: a liquid container, a gas flow inlet, a liquid inlet, a dividing chamber, a reaction chamber, and a conductive electrode; the gas flow inlet is connected to the gas flow inlet of the dividing chamber; the liquid inlet has one end sealed to the liquid inlet of the dividing chamber and the other end connected to the solution to be reacted in the liquid container; in the dividing chamber, the gas flow entering through the gas flow inlet divides and atomizes the solution to be reacted entering through the liquid inlet, forming a gas-liquid two-phase flow; the reaction chamber is connected to the gas-liquid outlet of the dividing chamber, and the gas-liquid two-phase flow enters the reaction chamber through the gas-liquid outlet; in the reaction chamber, the gas-liquid two-phase flow undergoes a frictional electrification reaction with the inner wall of the reaction chamber, forming a charged electric-liquid two-phase flow; the conductive electrode is disposed at the outlet of the reaction chamber and is used to acquire the charge in the charged electric-liquid two-phase flow.

Description

Technical Field

[0001] This invention relates to the field of triboelectric power generation, and in particular to a power generation device and method based on gas-liquid two-phase flow. Background Technology

[0002] Triboelectric nanogenerators (TENGs) combine triboelectric and electrostatic induction effects, offering numerous advantages such as low cost, high output, environmental friendliness, and versatility. In 2013, Lin et al. first reported water-based triboelectric nanogenerators (S-LTENGs) based on solid-liquid contact charging, thus opening a new chapter in the research of water energy harvesting and utilization. Since then, an increasing number of new materials and structures have been used in S-LTENGs.

[0003] Typically, S-LTENGs (Solid-Liquid-Electrified Electron Devices) for energy harvesting applications can be categorized into three modes based on the contact liquid source: droplet-type, wave-type, and continuous-flow type. Given the hydrophobic / superhydrophobic nature of the contact solid material surface, the liquid hardly diffuses completely across the surface. Therefore, the smaller solid-liquid contact charging area further leads to a smaller surface charge density and lower output. Furthermore, the relative separation rate of the solid and liquid at the contact charging interface also affects the output of S-LTENGs. Summary of the Invention

[0004] The purpose of this invention is to provide a power generation device and method based on gas-liquid two-phase flow, which improves the electrical output performance of the power generation device.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] A power generation device based on gas-liquid two-phase flow includes: a liquid container, a gas flow inlet, a liquid inlet, a partition chamber, a reaction chamber, and conductive electrodes;

[0007] The airflow inlet is connected to the airflow inlet of the segmented cavity;

[0008] The liquid inlet has one end sealed and connected to the liquid inlet of the dividing chamber, and the other end connected to the solution to be reacted in the liquid container.

[0009] In the segmentation chamber, the airflow entering through the airflow inlet segments and atomizes the solution to be reacted entering through the liquid inlet, forming a gas-liquid two-phase flow;

[0010] The reaction chamber is connected to the gas-liquid outlet of the dividing chamber. The gas-liquid two-phase flow enters the reaction chamber through the gas-liquid outlet. In the reaction chamber, the gas-liquid two-phase flow undergoes a frictional electrostatic reaction with the inner wall of the reaction chamber to form a charged electric-liquid two-phase flow.

[0011] The conductive electrode is disposed at the outlet of the reaction chamber and is used to acquire the charge in the charged electro-liquid two-phase flow.

[0012] Optionally, the inner diameter of the inlet end of the airflow inlet is larger than the inner diameter of the outlet end, and the inner diameter of the outlet end of the airflow inlet is the same as the diameter of the dividing cavity.

[0013] Optionally, the inner diameter of the airflow inlet gradually decreases from the inlet end to the outlet end.

[0014] Optionally, the airflow inlet is a tapered pipe.

[0015] Optionally, the power generation device further includes a diffusion cavity, the inlet of which is connected to the outlet of the reaction cavity, and the conductive electrode is disposed at the outlet of the diffusion cavity; the inner diameter of the inlet end of the diffusion cavity is smaller than the inner diameter of the outlet end of the diffusion cavity, in order to increase the contact area between the electric-liquid two-phase flow and the conductive electrode.

[0016] Optionally, the solution to be reacted is any one of deionized water, tap water, river water, lake water, seawater, or NaCl solution.

[0017] Optionally, the inner wall of the reaction chamber is made of a triboelectric material.

[0018] Optionally, the airflow velocity is greater than 10 m / s.

[0019] Optionally, the conductive electrode is made of a conductive and corrosion-resistant material.

[0020] Corresponding to the power generation device described above, the present invention also provides a power generation method based on gas-liquid two-phase flow, comprising the following steps:

[0021] An airflow is introduced into the airflow inlet, and the flow of the airflow creates a negative pressure in the dividing chamber. Under the action of the negative pressure, the solution to be reacted in the solution container enters the dividing chamber through the liquid inlet.

[0022] The charge is collected by the conductive electrode.

[0023] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects: The present invention provides a power generation device and method based on gas-liquid two-phase flow. The power generation device includes: a liquid container, a gas flow inlet, a liquid inlet, a dividing chamber, a reaction chamber, and a conductive electrode; the gas flow inlet is connected to the gas flow inlet of the dividing chamber; one end of the liquid inlet is sealed and connected to the liquid inlet of the dividing chamber, and the other end is connected to the solution to be reacted in the liquid container; in the dividing chamber, the gas flow entering through the gas flow inlet divides and atomizes the solution to be reacted entering through the liquid inlet, forming a gas-liquid two-phase flow; the reaction chamber is connected to the gas-liquid outlet of the dividing chamber, and the gas-liquid two-phase flow enters the reaction chamber through the gas-liquid outlet. In the reaction chamber, the gas-liquid two-phase flow undergoes a frictional electrification reaction with the inner wall of the reaction chamber, forming a charged electric-liquid two-phase flow; the conductive electrode is disposed at the outlet of the reaction chamber and is used to acquire the charge in the charged electric-liquid two-phase flow. This invention uses a continuous high-speed airflow to atomize the solution to be reacted, resulting in a gas-liquid two-phase flow containing a large number of atomized droplets. The high-speed airflow drives the atomized droplets to make rapid frictional contact with the inner wall of the reaction chamber. Compared with traditional SL TENGs, this increases the solid-liquid contact area and improves the relative separation speed of solid and liquid, thereby greatly improving the electrical output performance of the power generation device. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A schematic diagram of a power generation device based on gas-liquid two-phase flow provided by the present invention;

[0026] Figure 2 A flowchart of the power generation method provided by the present invention;

[0027] Figure 3 A schematic diagram of the power generation method provided by the present invention;

[0028] Figure 4 The current output diagram of the power generation method provided by the present invention.

[0029] In the diagram, 1-liquid container; 2-gas inlet; 3-liquid inlet; 4-dividing chamber; 5-reaction chamber; 6-conductive electrode; 7-diffusion chamber. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] The purpose of this invention is to provide a power generation device and method based on gas-liquid two-phase flow, which improves the electrical output performance of the power generation device.

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figure 1 As shown, the present invention provides a power generation device based on gas-liquid two-phase flow, comprising: a liquid container 1, a gas flow inlet 2, a liquid inlet 3, a partition chamber 4, a reaction chamber 5, and a conductive electrode 6;

[0034] The airflow inlet 2 is connected to the airflow inlet of the dividing cavity 4.

[0035] The liquid inlet 3 has its top end sealed to the throat pipe, and its lower end directly inserted below the liquid surface of the water tank. One end is sealed to the liquid inlet of the dividing chamber 4, and the other end is directly inserted into the solution to be reacted. The material of the liquid inlet 3 can be selected from polytetrafluoroethylene (PTFE), nylon, polyvinyl chloride (PVC), polypropylene (PP), copper (Cu), iron (Fe), etc., and the pipe diameter is 1mm×2mm~10mm×25mm. In this embodiment, PTFE pipe material is selected, and its pipe diameter is 1mm×2mm.

[0036] In the dividing chamber 4, the airflow entering through the airflow inlet will divide and atomize the solution to be reacted entering through the liquid inlet, forming a gas-liquid two-phase flow; the airflow velocity should be greater than 10m / s.

[0037] The reaction chamber 5 is connected to the gas-liquid outlet of the dividing chamber 4. The gas-liquid two-phase flow enters the reaction chamber 5 through the gas-liquid outlet. In the reaction chamber 5, the gas-liquid two-phase flow undergoes a frictional electrification reaction with the inner wall of the reaction chamber 5 to form an electrically charged two-phase flow.

[0038] The conductive electrode 6 is disposed at the outlet of the reaction chamber 5, at a distance of 0-50 mm from the outlet of the reaction chamber 5. The actual distance can be adjusted according to the maximum distance of the charged electro-liquid two-phase flow jet. It is used to acquire the charge in the charged electro-liquid two-phase flow. The conductive electrode 6 is made of conductive and corrosion-resistant material, and its shape can include various shapes such as mesh, needle, ring, linear, and porous structure. In this embodiment, a porous titanium metal electrode is selected with a diameter of 10 mm, a thickness of 0.5 mm, and a porosity of 70%.

[0039] As a possible alternative, the liquid container 1 is placed above the dividing chamber 4, and the solution to be reacted flows into the dividing chamber 4 through the liquid inlet 3 by means of gravity or siphon effect.

[0040] Of course, another possible option is to place the liquid container 1 below the dividing chamber 4, and by creating a negative pressure condition in the dividing chamber 4, the solution to be reacted is drawn into the dividing chamber 4 through the liquid inlet 3 by suction.

[0041] For the purpose of drawing the solution to be reacted into the dividing cavity 4, the inner diameter of the inlet end of the airflow inlet 2 is larger than the inner diameter of the outlet end, and the inner diameter of the outlet end of the airflow inlet 2 is the same as the pipe diameter of the dividing cavity 4, so as to accelerate the airflow speed and reduce the pressure in the dividing cavity 4.

[0042] As an alternative, the inner diameter of the airflow inlet 2 gradually decreases from the inlet end to the outlet end to accelerate the airflow speed, thereby reducing the pressure in the dividing cavity 4, and the inner diameter of the outlet end of the airflow inlet 2 is the same as the pipe diameter of the dividing cavity 4.

[0043] Similarly, the airflow inlet 2 can also be a tapered pipe, and the inner diameter of the outlet end of the airflow inlet 2 is the same as the pipe diameter of the dividing cavity 4.

[0044] In order to obtain more charge, the power generation device also includes a diffusion cavity 7, the inlet of which is connected to the outlet of the reaction cavity 5, and the conductive electrode 6 is disposed at the outlet of the diffusion cavity 7; the inner diameter of the inlet end of the diffusion cavity 7 is smaller than the inner diameter of the outlet end of the diffusion cavity 7, so as to expand the contact area between the charged electric-liquid two-phase flow and the conductive electrode 6.

[0045] In some embodiments, the reaction solution can be any one of deionized water, tap water, river water, lake water, seawater, or NaCl solution. In this embodiment, a 0.5 mol / L NaCl solution is selected as the reaction solution.

[0046] Since the solutions to be reacted are mostly positively charged solutions, the inner wall of the reaction chamber 5, which undergoes a triboelectric reaction with the solutions, should be made of a triboelectrically negatively charged material, such as polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), polystyrene (PS), or perfluoroethylene propylene copolymer (FEP). The inner diameter of the tube at the outlet of the reaction chamber 5 is 5mm×6mm to 1000mm×1020mm. In this embodiment, the material of the inner wall of the reaction chamber 5 is polytetrafluoroethylene (PTFE), and the inner diameter of the tube is 10mm×12mm.

[0047] The following example illustrates the power generation device based on gas-liquid two-phase flow provided by the present invention. In this example, a horizontal venturi tube is used instead of the gas flow inlet 2, the dividing cavity 4, the reaction cavity 5, and the diffusion cavity 7. The power generation device includes: a conductive electrode 6, a horizontal venturi tube, a liquid inlet 3, and a liquid container 1.

[0048] The conductive electrode 6 is located at the outlet of the horizontal venturi tube, with a distance of 0–50 mm from the outlet; the actual distance can be adjusted. The liquid inlet 3 is located at the throat of the venturi tube, with its top end sealed to the throat tube and its bottom end directly inserted below the liquid surface of the liquid container 1. In this example, the inner and outer diameters of the liquid inlet 3 are 1 mm × 2 mm, while the inner and outer diameters of the outlet of the horizontal venturi tube are 10 mm × 12 mm. At the inlet of the gas-liquid two-phase flow triboelectric generator, a high-pressure airflow with controllable frequency and speed generated by an air compression system is connected. When the airflow is running, the bottom pressure of the liquid inlet 3 is stronger than the top pressure, and the solution to be reacted in the liquid container 1 is forced out under the action of the pressure difference. The sprayed water eventually forms a gas-liquid two-phase flow under the action of the high-speed airflow. At the outlet of the gas-liquid two-phase flow triboelectric generator, titanium (diameter: 10 mm, thickness: 0.5 mm), which has good conductivity and corrosion resistance, is used as the conductive electrode to obtain the charge in the charged gas-liquid two-phase flow.

[0049] In this example, the external air compression system generates a high-speed airflow velocity of 35.0 m / s. During the test, the jet velocity was maintained at 35.0 m / s and a fixed frequency, i.e., a continuous jet on-time of 0.2 seconds and a jet off-time of 0.5 seconds. Under these conditions, the volume of atomized liquid in a single cycle was approximately 1.0 mL. When testing with a 0.5 mol / L NaCl solution, the maximum peak short-circuit output current and the maximum peak open-circuit output voltage of the generator were approximately 600 μA and 2500 V, respectively. When the external air compression system remained in "jet" mode, a continuous and stable voltage output with an average value of 2000 V could be obtained using the generator in this example. Such a high and stable output can drive general-power electronic devices after rectification, such as 1000 LED light groups and 11-watt commercial lighting fixtures.

[0050] like Figure 2 As shown, the present invention also provides a power generation method for a power generation device based on gas-liquid two-phase flow as described above, comprising the following steps:

[0051] S1. Airflow is introduced into the airflow inlet 2; the flow of airflow creates a negative pressure in the dividing chamber 4, and under the action of the negative pressure, the solution to be reacted in the solution container enters the dividing chamber 4 through the liquid inlet 3;

[0052] In the dividing chamber 4, the solution to be reacted is divided and atomized by the gas flow to obtain a gas-liquid two-phase flow and enter the reaction chamber; in the reaction chamber 5, the inner wall of the reaction chamber and the atomized droplets of the gas-liquid two-phase flow undergo a frictional electrification reaction to obtain an electrically charged two-phase flow.

[0053] Before the surface charge on the inner wall of the reaction chamber reaches saturation, some of the atomized droplets in the gas-liquid two-phase flow flow through the inner wall of the reaction chamber, lose electrons and acquire some positive charge.

[0054] After the surface charge on the inner wall of the reaction chamber reaches saturation, some of the atomized droplets in the gas-liquid two-phase flow flow through the inner wall of the reaction chamber, carrying away some of the negative charge.

[0055] S2, Collect the charge acquired by conductive electrode 6.

[0056] The following is in conjunction with the appendix Figure 3 The working principle of the power generation method based on gas-liquid two-phase flow provided by the present invention is specifically explained as follows: The working principle of this power generation method includes three parts: solid-liquid friction electrification I, contact charging II, and discharge III.

[0057] Before the surface charge on the inner wall of reaction chamber 5 reaches saturation, due to the different electron-gaining and loss capabilities of different materials, the droplets flowing through the inner wall of reaction chamber 5 will lose electrons and become positively charged (i.e., triboelectric charging I). These droplets will release positive charges when passing through the conductive electrode (i.e., discharge III). As the number of droplets flowing through the inner wall of reaction chamber 5 increases, its surface charge will gradually increase with triboelectric charging and eventually saturate. The next neutral droplets will carry away some negative charges when flowing through the charged inner wall of reaction chamber 5 (i.e., contact charging II). These negatively charged droplets will release negative charges at the conductive electrode. Therefore, the discharge behavior at this time is the opposite of that before saturation, resulting in negative charge output (i.e., discharge III). This cycle of triboelectric charging, discharge, contact charging, and discharge continues, and electrical energy is collected and utilized in this process. Figure 4 The current output test results illustrate the discharge process, where the output from t0 to t1 is negative and the output from t1 to t2 is positive.

[0058] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A power generation device based on gas-liquid two-phase flow, characterized by, The power generation device includes: a liquid container, a gas flow inlet, a liquid inlet, a dividing chamber, a reaction chamber, and conductive electrodes; The airflow inlet is connected to the airflow inlet of the segmented cavity; The liquid inlet has one end sealed and connected to the liquid inlet of the dividing chamber, and the other end connected to the solution to be reacted in the liquid container. In the segmentation chamber, the airflow entering through the airflow inlet segments and atomizes the solution to be reacted entering through the liquid inlet, forming a gas-liquid two-phase flow; The reaction chamber is connected to the gas-liquid outlet of the dividing chamber. The gas-liquid two-phase flow enters the reaction chamber through the gas-liquid outlet. In the reaction chamber, the gas-liquid two-phase flow undergoes a frictional electrostatic reaction with the inner wall of the reaction chamber to form a charged electric-liquid two-phase flow. The conductive electrode is disposed at the outlet of the reaction chamber and is used to acquire the charge in the charged electro-liquid two-phase flow.

2. The power generation device according to claim 1, characterized by The inner diameter of the inlet end of the airflow inlet is larger than the inner diameter of the outlet end, and the inner diameter of the outlet end of the airflow inlet is the same as the diameter of the dividing cavity.

3. The power generation device according to claim 1, characterized in that, The inner diameter of the airflow inlet gradually decreases from the inlet end to the outlet end, and the inner diameter of the outlet end of the airflow inlet is the same as the diameter of the dividing cavity.

4. The power generation device of claim 1, wherein The airflow inlet is a tapered pipe, and the inner diameter of the outlet end of the airflow inlet is the same as the diameter of the dividing cavity.

5. The power generation device of claim 1, wherein The power generation device further includes a diffusion cavity, the inlet of which is connected to the outlet of the reaction cavity, and the conductive electrode is disposed at the outlet of the diffusion cavity; the inner diameter of the inlet end of the diffusion cavity is smaller than the inner diameter of the outlet end of the diffusion cavity, which is used to increase the contact area between the electric-liquid two-phase flow and the conductive electrode.

6. The power generation device of claim 1, wherein The solution to be reacted is any one of secondary water, deionized water, tap water, river water, lake water, seawater, or NaCl solution.

7. The power generation device of claim 1, wherein The inner wall of the reaction chamber is made of a triboelectric material.

8. The power generation device of claim 1, wherein The airflow velocity is greater than 10 m / s.

9. The power generation device of claim 1, wherein The conductive electrode is made of a conductive and corrosion-resistant material.

10. A power generation method of the power generation device according to any one of claims 1 to 9, characterized by, The power generation method includes: An airflow is introduced into the airflow inlet, and the flow of the airflow creates a negative pressure in the dividing chamber. Under the action of the negative pressure, the solution to be reacted in the liquid container enters the dividing chamber through the liquid inlet. The charge is collected by the conductive electrode.

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