WO2022062042A1

WO2022062042A1 - Hot electric charge power cycle system taking liquid droplets as carrier

Info

Publication number: WO2022062042A1
Application number: PCT/CN2020/124005
Authority: WO
Inventors: 姜东岳; 田鹏昊; 陈贵军; 东明
Original assignee: 大连理工大学
Priority date: 2020-09-25
Filing date: 2020-10-27
Publication date: 2022-03-31
Also published as: CN112152510B; CN112152510A

Abstract

A hot electric charge power cycle system taking liquid droplets as a carrier. The system comprises a peristaltic pump (1), the peristaltic pump (1) is connected to a water supply pipe (2-1) by means of a water outlet, the water supply pipe (2-1) is connected to a liquid droplet dropping pipe (4), a heater (3) is mounted above the liquid droplet dropping pipe (4), and a pyroelectric collector (5) is mounted below the liquid droplet dropping pipe (4). According to the hot electric charge power cycle system, a power cycle system based on low-grade hot liquid droplets is constructed, the energy of the low-grade hot liquid droplets usually difficult to recycle in the industry can be recycled via the power cycle, and useful work is generated, so that the energy recycling mode of the low-grade hot liquid droplets is enriched, and beneficial supplement is provided for a power source of a micro electromechanical system. In addition, capillary wave blades used in the hot electric charge power cycle system are light in weight, no rotating components are used in a working process and thus no noise is generated, and durability and silence effect are good.

Description

A thermoelectric power cycle system using droplets as carriers

technical field

The invention relates to the field of mechanical engineering, in particular to a thermoelectric power cycle system using droplets as carriers.

Background technique

Useful work and mechanical energy are the products of the first industrial revolution, providing reliable kinetic energy for locomotives, construction machinery and other fields. The generation of traditional useful work relies on the Rankine cycle, the Otto cycle, the Diesel cycle, the Stirling cycle, etc., which are still the main source of power for the industrial sector today. However, the traditional thermal power cycle requires medium and high-grade thermal energy contained in the high-temperature flue gas generated by fuel combustion and the superheated steam generated by heating water. The acquisition of these energy requires a large amount of fossil fuels. There are a large number of low-grade hot droplets in nature and industrial production, such as hot springs, spray droplets in cooling towers of thermal power plants, etc. These droplets contain abundant but low-grade heat, and it is difficult to convert the abundant low-grade heat in the droplets into useful work using the above-mentioned traditional thermal power cycle. Some emerging technologies for low-grade heat recovery and utilization include heat pump technology and thermoelectric generators, etc. However, these technologies have different limitations in recovering the low-grade heat carried by droplets. For example, a heat pump can circulate this part of the low-grade heat through the refrigerant working medium for cooling and heating. It has a wide range of applications in the field of HVAC. However, the low-grade heat in the droplets is difficult to be converted into useful work by heat pump technology. ; Thermoelectric generators use the Peltier effect to convert heat into electrical energy in the presence of temperature differences. However, due to low thermoelectric conversion efficiency and small electrical energy output, it is difficult to convert low-grade heat in droplets into useful work. .

SUMMARY OF THE INVENTION

According to the problems existing in the prior art, the present invention discloses a thermoelectric power cycle system using droplets as a carrier, which collects the droplet energy in the low-grade heat energy, converts it into an alternating current signal by using the system, and then converts it into an alternating current signal. The application of an alternating current signal to the propelling of the blade ultimately results in useful work. The system generates an alternating current signal based on the heat carried by the hot droplet and the rapid contact and separation of the droplet on the surface of the lithium niobate pyroelectric substrate, and uses the alternating current signal to generate capillary waves on the blade surface. The blade generates reverse thrust. Under the action of reverse thrust, the blade, the rotating shaft and the bearing form a new power system to generate useful work. The circulation of the system can reduce additional water replenishment. The system specifically includes: a peristaltic pump, which is connected to a water supply pipe through a water outlet, and the water supply pipe is connected to a droplet dropper, and the droplet dropper is installed above the dropper. There is a heater, and a pyroelectric collector is installed below the drop pipette, and the pyroelectric collector includes a lithium niobate pyroelectric substrate, and the front side of the lithium niobate pyroelectric substrate and the The back is respectively plated with a positive electrode and a negative electrode, the top of the positive electrode is coated with a hydrophobic coating, the negative electrode is attached to the heat sink, the positive electrode is connected with the electrode of the paddle through the positive wire, and the The negative electrode is connected with the collecting water tank through the negative wire, the middle part of the collecting water tank is provided with a rotating shaft, the rotating shaft is fixed to the bottom of the collecting water tank through the bearing, and the water outlet of the collecting water tank is connected with the peristaltic pump through the return pipe ;

In working state: the peristaltic pump sucks the water pre-stored in the collection tank through the return pipe, and then transports it to the droplet dropper from the water supply pipe. The droplet droplet produces continuous droplets, and the heater generates under the action of electric current. The heat heats the water in the water supply pipe, so that the droplets generated in the droplet pipette are in a heated state, and the hot droplets generated by the droplet pipette drop to the surface of the pyroelectric collector, transferring the heat to the niobium On the lithium niobate pyroelectric substrate, the input of heat leads to the change of the motion state of the electric dipole inside the lithium niobate pyroelectric substrate, thus resulting in the change of the surface charge density of the lithium niobate pyroelectric substrate, wherein the change of the charge density makes the niobium A potential difference is generated between the positive electrode and the negative electrode on the front and back of the lithium-acid pyroelectric substrate, and the heat obtained by the pyroelectric collector is conducted to the heat sink, so that the pyroelectric polarization disappears, and the generation between the positive electrode and the negative electrode occurs. A reverse potential difference, in which the dropping and leaving of hot droplets on the surface of the pyroelectric collector generates an alternating current signal between the positive electrode and the negative electrode, and under the action of dielectric wetting, a capillary wave is generated on the blade, capillary When the wave is transmitted outward, it generates a reverse thrust on the blade. Under the action of the reverse thrust, the rotating shaft rotates around the bearing to generate useful work.

The paddle includes a first paddle, a second paddle, and a third paddle, wherein each paddle includes a paddle substrate, a paddle electrode and a Teflon hydrophobic coating. The 2 paddles and the third paddle are arranged on the rotating shaft at an angle of 120°, wherein the positive electrode is connected to the electrodes of the first paddle, the second paddle and the third paddle through the positive wire, and the negative electrode passes through the negative electrode. The wires are connected to the body of water in the collection tank.

Due to the adoption of the above technical solutions, the present invention provides a thermal charge power cycle system with droplets as a carrier, which constructs a new power cycle system based on low-grade hot droplets. The energy of the recycled low-grade hot droplets is recovered and utilized to generate useful work, which not only enriches the energy recovery methods of the low-grade hot droplets, but also provides a beneficial supplement to the power source of the MEMS system. In addition, the capillary wave blade used in the present invention is light in weight, has no rotating parts during the working process, has no noise, and has good durability and mute effect; at the same time, the present invention has the following advantages: (a) the hot droplet is used as a carrier. Pyroelectric AC signal generator. Due to the working characteristics of pyroelectricity itself, a constant temperature difference cannot make the pyroelectric generating device generate continuous electrical energy output, and periodic heat sources are not common in nature and industrial production. The rapid contact and separation realizes high-frequency and periodic heat input, which lays the foundation for the generation of alternating current signals; (b) The power system uses the transmission of capillary waves as the power source, which is different from the traditional fuel combustion work and steam push work. , the power can be generated by the propagation of water waves, and the system has the characteristics of variable scale, low cost and convenient maintenance.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments described in this application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is the overall structure diagram of the thermoelectric power cycle system;

Fig. 2 (a) is the assembly drawing of pyroelectric collector;

Figure 2(b) is the assembly drawing of the heat sink;

Figure 3(a)(b) is the assembly drawing of the blade;

Fig. 4 is the assembly drawing of the rotating shaft and the bearing of the collecting water tank;

Fig. 5 is a water wave state diagram on the blade surface when the hot droplet does not drop to the pyroelectric collector;

Fig. 6 is the state diagram of the water wave on the blade surface when the hot droplet drops to the pyroelectric collector;

In the picture: 1. Peristaltic pump, including 1-A, peristaltic pump body, 1-B, water outlet, 1-C, water return port, 2, water pipe 2, including 2-1, water supply pipe, 2-2, return water pipe , 3,

heater

3, 4, drop pipette, 5, pyroelectric collector, including 5-A, lithium niobate pyroelectric substrate, 5-B, positive electrode, 5-C, negative electrode, 5 -D, hydrophobic coating, 6, heat sink, 7, collecting water tank, including 7-A, box body, 7-B, water outlet, 8, wire 8, including 8-A, positive wire, 8-B negative wire ,9, blade set, 9-1, 1st blade, 9-2, 2nd blade, 9-3, 3rd blade, 9-A, blade substrate, 9-B, blade electrode , 9-C, Teflon hydrophobic coating, 10, rotating shaft, 11, bearing.

detailed description

In order to make the technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention:

As shown in FIG. 1-FIG. 4, a thermoelectric power circulation system using droplets as a carrier specifically includes a peristaltic pump 1, which includes a peristaltic pump body 1-A, a water outlet 1-B, and a water return port 1-C, The water pipe 2 includes a water supply pipe 2-1, a water return pipe 2-2, a heater 3, a droplet dropper 4, and the pyroelectric collector 5 includes a lithium niobate pyroelectric substrate 5-A, a positive electrode 5-B, and a negative electrode Electrode 5-C, hydrophobic coating 5-D, heat sink 6, collecting tank 7, including box 7-A and water outlet 7-B, lead 8, including positive lead 8-A and negative lead 8-B, paddle There are 3 blades in the blade group 9, including a first blade 9-1, a second blade 9-2 and a third blade 9-3. Each blade includes a blade substrate 9-A, a blade electrode 9- B. Teflon hydrophobic coating 9-C, composed of rotating shaft 10 and bearing 11. The water outlet 1-B of the peristaltic pump 1 is connected with the water supply pipe 2-1, and the water supply pipe 2-1 is connected with the droplet dropper 4, and a heater 3 is installed above the droplet dropper 4, which is located in the liquid droplet dropper 4. Below the dropper 4, a positive electrode 5-B and a negative electrode 5-C are respectively plated on the front and back of the lithium niobate pyroelectric substrate 5-A, and a hydrophobic coating 5 is applied on the positive electrode 5-B. -D, the negative electrode 5-C is attached to the heat sink 6, the positive electrode 5-B is connected to the electrode 9-B of the paddle 9 through the positive wire 8-A, and the negative electrode 5-C is inserted into the collection tank by the negative wire In 7, the first paddle 9-1, the second paddle 9-2, and the third paddle 9-3 are placed on the rotating shaft 10 at an angle of 120°, and the rotating shaft 10 is fixed to the bottom of the collecting tank 7 by the bearing 11, The water outlet 7-B of the collecting water tank 7 is connected with the water return port 1-C of the peristaltic pump through the water return pipe 2-2 to form a circulation system.

From the working characteristics of the lithium niobate pyroelectric substrate, it can be known that the periodic heat-cold transformation is an important factor for generating an alternating current signal. Sliding to realize the periodic transfer of heat, thereby generating an alternating current signal. In working state: the peristaltic pump 1 sucks the water pre-stored in the collection water tank 7 through the return pipe 2-2, and then transports it to the droplet dropper 4 from the water supply pipe 2-1. The pipe 4 can produce continuous droplets. Above the droplet pipette 4, a heater 3 is arranged. The heater 3 generates heat under the action of electric current, and heats the water in the water supply pipe 2-1, thereby making the droplet pipette The droplets produced in 4 are heated and used to simulate industrial low-grade hot droplets. The hot droplets produced by the droplet dropper 4 drop onto the surface of the pyroelectric collector 5, and transfer the heat to the lithium niobate pyroelectric substrate 5-A. Due to the input of heat, the lithium niobate pyroelectric The movement state of the electric dipole inside the substrate 5-A changes, which leads to the change of the surface charge density of the lithium niobate pyroelectric substrate 5-A. This charge density change makes the front and back of the lithium niobate pyroelectric substrate 5-A change. A potential difference is generated between the positive electrode 5-B and the negative electrode 5-C. Since the hydrophobic material Teflon 5-D is coated on the positive electrode 5-B, the hot droplets can quickly slide down into the collection tank 7, and the thermal release The heat obtained by the electrical collector 5 is rapidly transferred to the heat sink 6, and the pyroelectric polarization disappears, which causes a reverse potential difference between the positive electrode 5-B and the negative electrode 5-C, and the hot droplets in the pyroelectric The continuous dripping and leaving of the surface of the collector 5 causes an alternating current signal to be generated between the positive electrode 5-B and the negative electrode 5-C.

Further, the positive electrode 5-B is connected to the electrodes 9-A of the first paddle 9-1, the second paddle 9-2 and the third paddle 9-3 through the positive lead wire 8-A, and the negative electrode 5-C is connected with the water body in the collection tank 7 by the negative wire 8-B. Under the action of dielectric wetting, the first blade 9-1, the second blade 9-2, the third blade 9- Capillary waves are generated on the Teflon hydrophobic material 9-C of the Reverse thrust, due to the first blade 9-1, the second blade 9-2, and the third blade 9-3 are fixed on the rotating shaft 10 at 120°, under the action of the reverse thrust, the rotating shaft 10 surrounds the bearing 11 Rotation produces useful work.

Further, as shown in FIG. 5 , it is a state diagram of the water wave on the surface of the blade 9 when the hot droplet does not drop to the pyroelectric collector 5 . When the hot droplet does not drop to the pyroelectric collector 5, the lithium niobate pyroelectric substrate 5-A has excess positive charge on the surface of the positive electrode 5-B due to the existence of its own dipole, and the negative electrode 5 The surface of -C has excess negative charges, and these positive and negative charges do not move under the action of the dipoles of the lithium niobate pyroelectric substrate. When the paddle electrode 9-B is connected to the positive electrode 5-B through the positive wire 8-A, and the water is connected to the negative electrode 5-C, there is no potential difference between the paddle electrode 9-B and the water. 9's Teflon hydrophobic coating 9-C makes the water in contact with it in a hydrophobic state.

Further, as shown in FIG. 6 , it is a state diagram of water waves on the surface of the blade 9 when the hot droplets drop onto the pyroelectric collector 5 . When the hot droplets drop to the pyroelectric collector 5, the thermal motion state of the dipole inside the lithium niobate pyroelectric substrate 5-A changes, so that the excess positive charge on the surface of the positive electrode 5-B and the negative electrode 5- The excess negative charge on the surface of C is transmitted to the paddle electrode 9-B and the water through the positive wire 8-A and the negative wire 8-B, so a potential difference is formed between the paddle electrode 9-B and the water. The water surface in a hydrophobic state becomes a hydrophilic state on the Teflon hydrophobic layer 9-C. When the hot droplets continuously drop to the pyroelectric collector 5, water waves will be generated on the water surface in contact with the Teflon hydrophobic layer 9-C. .

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. The equivalent replacement or change of the inventive concept thereof shall be included within the protection scope of the present invention.

Claims

A thermoelectric power circulation system using droplets as a carrier, characterized by comprising: a peristaltic pump (1), the peristaltic pump (1) being connected to a water supply pipe (2-1) through a water outlet, and the water supply pipe (2-1) is connected to a droplet pipette (4), a heater (3) is installed above the droplet pipette (4), and a pyroelectric heater is installed below the droplet pipette (4) An electrical collector (5), the pyroelectric collector (5) comprises a lithium niobate pyroelectric substrate (5-A), the front surface of the lithium niobate pyroelectric substrate (5-A) and the The back is respectively plated with a positive electrode (5-B) and a negative electrode (5-C), the positive electrode (5-B) is coated with a hydrophobic coating (5-D), and the negative electrode (5-C) ) is attached to the heat sink (6), the positive electrode (5-B) is connected with the electrode (9-B) of the paddle (9) through the positive wire (8-A), and the negative electrode (5-B) -C) is connected with the collecting water tank (7) through the negative lead (8-B), the middle of the collecting water tank (7) is provided with a rotating shaft (10), and the rotating shaft (10) is fixed by the bearing (11) At the bottom of the collecting water tank (7), the water outlet of the collecting water tank (7) is connected with the peristaltic pump (1) through the return pipe (2-2);

In the working state: the peristaltic pump (1) sucks the water pre-stored in the collecting water tank (7) through the return pipe (2-2), and then transports it to the droplet dropper (4) from the water supply pipe (2-1) , the droplet dropper (4) produces continuous droplets, and the heater (3) generates heat under the action of the current to heat the water in the water supply pipe (2-1), so that the droplet droplet (4) produces The droplets are in a heated state, and the hot droplets generated by the droplet dropper (4) drop onto the surface of the pyroelectric collector (5), and transfer the heat to the lithium niobate pyroelectric substrate (5-A) On the other hand, the input of heat leads to a change in the motion state of the electric dipoles inside the lithium niobate pyroelectric substrate (5-A), thus resulting in a change in the surface charge density of the lithium niobate pyroelectric substrate (5-A), where the charge The density change causes a potential difference between the positive electrode (5-B) and the negative electrode (5-C) on the front and back of the lithium niobate pyroelectric substrate (5-A), and the heat obtained by the pyroelectric collector (5) Conducted into the heat sink (6) so that the pyroelectric polarization disappears, and a reverse potential difference is generated between the positive electrode (5-B) and the negative electrode (5-C), wherein the hot droplets are in the pyroelectric collector. (5) The dripping and leaving of the surface causes an alternating current signal to be generated between the positive electrode (5-B) and the negative electrode (5-C), and a capillary wave is generated on the blade (9) under the action of dielectric wetting, While the capillary waves are transmitted outward, a reverse thrust is generated on the blade (9), and under the action of the reverse thrust, the rotating shaft (10) rotates around the bearing (11) to generate useful work.
A thermoelectric power circulation system using droplets as a carrier according to claim 1, further characterized in that: the paddle (9) comprises a first paddle (9-1), a second paddle (9) -2), the third blade (9-3), wherein each blade includes a blade substrate (9-A), a blade electrode (9-B) and a Teflon hydrophobic coating (9-C) , the first paddle (9-1), the second paddle (9-2), and the third paddle (9-3) are arranged on the rotating shaft (10) at an angle of 120°, wherein the positive electrode (5) -B) Connected to the electrodes (9-A) of the 1st paddle (9-1), 2nd paddle (9-2) and 3rd paddle (9-3) via the positive lead (8-A) , the negative electrode (5-C) is connected with the water body in the collecting water tank (7) through the negative wire (8-B).