CN112865607A - Thermoelectric conversion fluid pipeline for low-grade heat energy recovery and conversion method - Google Patents
Thermoelectric conversion fluid pipeline for low-grade heat energy recovery and conversion method Download PDFInfo
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- CN112865607A CN112865607A CN202110067282.7A CN202110067282A CN112865607A CN 112865607 A CN112865607 A CN 112865607A CN 202110067282 A CN202110067282 A CN 202110067282A CN 112865607 A CN112865607 A CN 112865607A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N11/00—Generators or motors not provided for elsewhere; Alleged perpetua mobilia obtained by electric or magnetic means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/30—Deferred-action cells
- H01M6/36—Deferred-action cells containing electrolyte and made operational by physical means, e.g. thermal cells
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Abstract
A fluid pipeline for low-grade heat energy recovery comprises a thermoelectric conversion module and an insulating pipeline, wherein the thermoelectric conversion module comprises a fluid pipeline for passing hot fluid, a conductive material in contact with the outside, a reaction chamber between the fluid pipeline and the conductive material and a shell, and the reaction chamber is filled with electrolyte solution. In the thermoelectric conversion module, when hot fluid passes through the hot fluid pipeline, the temperature of the hot fluid side is higher, so that the temperature of the conductive material in contact with air is lower due to low air temperature, and a temperature difference is formed. Therefore, the thermoelectric conversion module generates electricity by using the temperature difference between both ends. Different thermoelectric conversion modules are connected in series, in parallel or in series-parallel to integrate electric energy. The thermoelectric conversion module can recover part of energy in the hot fluid, realizes energy recovery dissipated on a common pipeline and converts the energy into electric energy to be stored, and the electric energy is applied to other electric equipment, so that the utilization efficiency of the energy is improved.
Description
Technical Field
The invention belongs to the technical field of low-grade energy recovery, and particularly relates to a thermoelectric conversion fluid pipeline for low-grade heat energy recovery and a conversion method.
Background
With the continuous development of human society, the demand of human beings on energy sources is increasing. Fossil fuels have been the most important energy source for human beings, and have been a great push for the development of human economy and society in the past century, but the energy utilization rate of fossil fuels is not high due to technical limitations. The main reason is that most of the low grade heat energy is not utilized. A large amount of low grade heat energy is present in industrial activities, especially in industrial pipelines. For many years, research has been devoted to recycling the low grade energy that is wasted in industry, thereby increasing the capacity utilization. A large amount of low-grade heat energy exists in industrial pipelines, and no researcher reasonably recovers the energy, so that energy is wasted.
Disclosure of Invention
In order to overcome the above-mentioned disadvantages of the prior art, an object of the present invention is to provide a thermoelectric conversion fluid pipeline for low-grade heat recovery, in which a thermoelectric conversion module can be installed on an existing hot fluid pipeline, a plurality of thermoelectric conversion modules can be installed on the same pipeline to realize parallel connection of the thermoelectric conversion modules, and the pipelines can be connected by insulating pipelines to realize series connection of the thermoelectric conversion modules. The heat emitted by the hot fluid is recycled, the energy is converted into electric energy, the energy utilization efficiency is improved, and meanwhile, the requirements on voltage and battery output power in specific application are met by connecting the thermoelectric conversion modules in series, in parallel or in series-parallel. The fluid pipeline has simple structure, easy installation, small investment and convenient operation and can continuously run. The invention is suitable for various hot fluid pipelines.
In order to achieve the purpose, the invention adopts the technical scheme that:
a thermoelectric conversion fluid pipeline for low-grade heat energy recovery comprises a heat fluid pipe 1, wherein one end of the heat fluid pipe 1 is a hot fluid inlet end 6, the other end of the heat fluid pipe 1 is a hot fluid outlet end 7, a plurality of thermoelectric conversion modules 8 are installed outside the heat fluid pipe 1, each thermoelectric conversion module 8 is a thermoelectric chemical battery, each thermoelectric conversion module 8 comprises a closed shell 4 wrapped outside the heat fluid pipe 1, all or part of the side wall of the shell 4 is made of a conductive material 2, the conductive material 2 is not connected with the pipe wall of the heat fluid pipe 1, and a reaction chamber 3 filled with electrolyte solution is arranged in the shell 4.
The heat fluid pipe 1 can be made of materials with good electric conductivity and heat conductivity, such as stainless steel, titanium, zinc, nickel, aluminum or graphite, the electric conductive material 2 can be made of materials with good electric conductivity and heat conductivity, such as stainless steel, titanium, zinc, nickel, aluminum or graphite, the electrolyte solution can be a mixed solution of potassium ferricyanide and potassium ferrocyanide, and the rest parts of the shell 4 except the electric conductive material 2 are made of materials with good insulating property and heat insulating property, such as organic glass, quartz transparent materials or plastics.
The heat fluid pipe 1 may be a round pipe or a square pipe, and the housing 4 may be a cylinder or a cube or other geometric shapes conforming to the electrochemical principle.
The outer side wall of the shell 4 is a smooth surface or an outer surface provided with a reinforced heat exchange structure such as a fin.
When the number of the thermoelectric conversion modules 8 is more than 1, the adjacent thermoelectric recovery modules 8 are connected with the insulating pipe 5.
The insulating pipeline 5 can be a round pipe or a square pipe and is made of plastic or other materials with good insulating property.
The thermoelectric conversion modules 8 are integrated in a series, parallel or series-parallel manner, and the size and the number of the thermoelectric conversion modules 8 are selected according to specific requirements.
A load 9 is connected to both the electrically conductive material 2 and the thermal fluid pipe 1.
The invention also provides a thermoelectric conversion method based on the thermoelectric conversion fluid pipeline for low-grade heat energy recovery, which comprises the following steps:
1) inputting low-grade heat energy from a hot fluid inlet end 6, outputting the heat energy from a hot fluid outlet end 7, taking the hot fluid pipe 1 as a hot end, contacting the conductive material 2 with external cold air as a cold end, and performing heat exchange by utilizing the temperature difference between the hot fluid pipe 1 and the conductive material 2;
2) and the thermoelectric conversion module 8 generates potential output by utilizing the temperature difference generated in the step 1) to generate power, wherein the thermoelectric tube 1 is an anode, and the conductive material 2 is a cathode.
The principle of the invention is as follows:
the thermoelectric electrochemical cell generates electricity by using a temperature difference between electrodes based on an oxidation-reduction reaction. In the present invention, when the electrolyte solution is a mixed solution of potassium ferricyanide and potassium ferrocyanide, the electrode reaction is as follows:
hot end: anode
Cold end: cathode electrode
Compared with the prior art, the thermoelectric conversion module is arranged on the surface of the hot fluid pipeline, so that the temperature difference between the hot fluid and the outside and between the fluid pipeline and the conductive material is reasonably utilized to generate electricity, the low-grade heat energy in the hot fluid pipeline is effectively utilized, the energy recovery is realized, and the utilization efficiency of the energy is improved.
Drawings
Fig. 1 is a schematic diagram of a thermoelectric recovery module for low grade heat recovery in accordance with the present invention.
Fig. 2 is a schematic diagram of a fluid circuit for low grade heat recovery in accordance with the present invention.
Fig. 3 is a schematic diagram of a series type of fluid circuit for low grade heat recovery that can be used with the present invention.
The device comprises a heat fluid pipe 1, a conductive material 2, a reaction chamber 3, a shell 4, an insulating pipeline 5, a heat fluid inlet end 6, a heat fluid outlet end 7, a thermoelectric conversion module 8 and a load 9.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples. The described embodiment is only one embodiment of the present invention, and is not all embodiments related to the present invention, and the embodiments of the present invention are not limited thereto.
50% of heat in industrial energy consumption is discharged into air and water through the waste heat medium, and the low-grade heat energy is the heat energy in the waste heat medium when the waste heat medium is transported through a pipeline. The fluid pipeline for low-grade heat recovery can recover heat emitted by hot fluid, convert the energy into electric energy, improve the energy utilization efficiency, and meet the requirements on voltage and battery output power in specific application by connecting the thermoelectric conversion modules in series, in parallel or in series-parallel. The fluid pipeline has simple structure, easy installation, small investment and convenient operation and can continuously run.
As shown in fig. 1 and 2, the present invention includes a heat fluid pipe 1, one end of the heat fluid pipe 1 is a heat fluid inlet end 6, and the other end is a heat fluid outlet end 7, and the specific diameter and length of the heat fluid pipe 1 are related to the specific requirements and installation environment. A plurality of thermoelectric conversion modules 8 are arranged outside the heat fluid pipe 1, and the thermoelectric conversion modules 8 are thermoelectric chemical batteries. Each thermoelectric conversion module 8 comprises a closed shell 4 wrapped outside the hot fluid pipe 1, wherein all or part of the side wall of the shell 4 is made of the conductive material 2, the conductive material 2 can also be attached to the inner side wall of the shell 4, the conductive material 2 is not connected with the pipe wall of the hot fluid pipe 1, a reaction chamber 3 is arranged in the shell 4, and the reaction chamber 3 is filled with electrolyte solution. The thermoelectric conversion modules 8 are integrated in a series, parallel or series-parallel manner, and the size and the number of the thermoelectric conversion modules are selected according to specific requirements. When the number of the thermoelectric conversion modules 8 is more than 1, the adjacent thermoelectric recovery modules 8 are connected with the insulating pipe 5. Both the electrically conductive material 2 and the thermal fluid pipe 1 can be connected to a load 9.
In the invention, the thermal fluid pipe 1 can be a round pipe or a square pipe and can be made of materials with good electric conductivity and heat conductivity, such as stainless steel, titanium, zinc, nickel, aluminum or graphite, etc., the electric conductive material 2 can be made of materials with good electric conductivity and heat conductivity, such as stainless steel, titanium, zinc, nickel, aluminum or graphite, etc., the electrolyte solution can be a mixed solution of potassium ferricyanide and potassium ferrocyanide, the shell 4 can be a cylinder or a cube, etc., and other geometric shapes according with the electrochemical principle, the rest part of the shell 4 except the electric conductive material 2 is made of materials with good insulating property and heat insulating property, such as organic glass, quartz transparent material or plastic, etc., the outer side wall of the shell is a smooth surface or an outer surface provided with a strengthening heat exchange structure, such as fins, etc., the insulating pipeline 5 can be a round pipe or a square pipe and is made of plastic or other materials with good insulating.
Fig. 3 is a schematic diagram of a series-type fluid circuit for low-grade heat recovery that can be used in the present invention. The relevant parameters in this example are as follows: the number of the thermoelectric conversion modules is 3, the fluid pipeline 1 is made of graphite, the conductive material 2 is made of graphite, the fluid pipeline 1 is an anode, the conductive material 2 is a cathode, the electrode distance is 3.0cm, and the area of the cathode electrode is 7.07cm2The area of the anode electrode is 7.07cm2Electrolyte 0.5M K3Fe(CN)6/K4Fe(CN)6. According to experimental data, when the temperature difference between the cathode and the anode is 20K, the maximum output power density P of a single thermoelectric conversion modulemaxIs 17.09mW/m2Open circuit voltage UocThe concentration was 17.72 mV. When the 3 thermoelectric conversion modules are connected in series, the maximum output power density P of the whole thermoelectric conversion fluid pipelinemax51.27mW/m2Open circuit voltage UocThe concentration was 53.19 mV. The invention realizes the function of recovering low-grade heat in hot fluid and converting the low-grade heat into electric energy for output, and can provide considerable voltage and output power when the thermoelectric conversion modules are connected in series.
In summary, according to the present invention, a portion of the heat emitted by the hot fluid as it flows through the pipeline exits the pipeline with the hot fluid; the other part is recycled by the thermoelectric conversion module. The thermoelectric conversion module plays a role in recovering low-grade heat in part of hot fluid and converts the part of heat into electric energy for output, and on the other hand, the thermoelectric conversion module can be connected in series, in parallel or in series and in parallel, so that the requirements on voltage and battery output power in specific application are met.
The above description is only one embodiment of the present invention, and any person skilled in the art or familiar with the relevant art may make modifications and substitutions according to the spirit of the present invention within the scope of the present disclosure without any innovations, and other embodiments are also within the scope of the present invention.
Claims (10)
1. A thermoelectric conversion fluid pipeline for low-grade heat energy recovery comprises a heat fluid pipe (1), one end of the heat fluid pipe (1) is a hot fluid inlet end (6), and the other end of the heat fluid pipe is a hot fluid outlet end (7), and is characterized in that a plurality of thermoelectric conversion modules (8) are installed outside the hot fluid pipe (1), each thermoelectric conversion module (8) is a thermoelectric chemical cell, each thermoelectric conversion module (8) comprises a closed shell (4) wrapped outside the hot fluid pipe (1), wherein all or part of the side wall of the shell (4) is made of a conductive material (2), the conductive material (2) is not connected with the pipe wall of the hot fluid pipe (1), and a reaction chamber (3) filled with electrolyte solution is arranged in the shell (4).
2. The thermoelectric conversion fluid circuit for low-grade heat energy recovery according to claim 1, wherein the thermal fluid pipe (1) is made of stainless steel, titanium, zinc, nickel, aluminum or graphite, the electrically conductive material (2) is made of stainless steel, titanium, zinc, nickel, aluminum or graphite, the electrolyte solution is a mixed solution of potassium ferricyanide and potassium ferrocyanide, and the rest of the housing (4) except the electrically conductive material (2) is made of organic glass, glass or quartz.
3. The thermoelectric conversion fluid circuit for low-grade heat energy recovery according to claim 1, wherein the thermal fluid pipe (1) is a circular or square pipe and the housing (4) is a cylinder or cube.
4. The heat-electricity conversion fluid circuit for low-grade heat energy recovery according to claim 1, wherein the outer side wall of the housing (4) is smooth or is provided with a heat exchange enhancement structure.
5. The thermoelectric conversion fluid circuit for low-grade heat energy recovery according to claim 1 or 2 or 3 or 4, wherein when the number of thermoelectric conversion modules (8) is more than 1, the adjacent thermoelectric recovery modules (8) are connected with the insulating pipe (5).
6. Thermoelectric conversion fluid circuit for low-grade heat energy recovery according to claim 5, characterized in that the insulating pipe (5) is a round or square pipe made of plastic.
7. Thermoelectric conversion fluid circuit for low-grade heat energy recovery according to claim 5, characterized in that the thermoelectric conversion modules (8) are integrated in series, in parallel or in series-parallel.
8. Thermoelectric conversion fluid circuit for low-grade heat energy recovery according to claim 1, characterized in that a load (9) is connected to both the electrically conductive material (2) and the hot fluid pipe (1).
9. The thermoelectric conversion fluid circuit for low-grade heat energy recovery of claim 1, wherein the low-grade heat energy is heat energy in a waste heat medium when the waste heat medium is transported through a pipeline.
10. The method of thermoelectric conversion of a thermoelectric conversion fluid circuit for low-grade heat energy recovery of claim 1, comprising the steps of:
1) inputting low-grade heat energy from a hot fluid inlet end (6), outputting the heat energy from a hot fluid outlet end (7), taking a hot fluid pipe (1) as a hot end, contacting a conductive material (2) with external cold air as a cold end, and performing heat exchange by utilizing the temperature difference between a heat flow pipeline (1) and the conductive material (2);
2) and the thermoelectric conversion module (8) generates potential output by utilizing the temperature difference generated in the step 1) to generate electricity, wherein the thermoelectric tube (1) is an anode, and the conductive material (2) is a cathode.
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| CN202110067282.7A CN112865607A (en) | 2021-01-19 | 2021-01-19 | Thermoelectric conversion fluid pipeline for low-grade heat energy recovery and conversion method |
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| CN202110067282.7A CN112865607A (en) | 2021-01-19 | 2021-01-19 | Thermoelectric conversion fluid pipeline for low-grade heat energy recovery and conversion method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102756660A (en) * | 2011-04-28 | 2012-10-31 | 吴宸至 | Automobile capable of saving oil by 50 percent |
| CN106449961A (en) * | 2016-11-01 | 2017-02-22 | 中国工程物理研究院化工材料研究所 | Electrode structure of electrolyte thermobattery and electrolyte thermobattery preparation method |
| CN106532095A (en) * | 2016-10-12 | 2017-03-22 | 中国工程物理研究院化工材料研究所 | High-power-density electrolyte thermobattery and preparation method for porous carbon electrodes |
| CN107681925A (en) * | 2017-10-26 | 2018-02-09 | 浙江大学 | A kind of residual heat using device of two-stage thermo-electric generation |
| CN112234220A (en) * | 2019-07-15 | 2021-01-15 | 张宇彻 | Thermoelectric cell |
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2021
- 2021-01-19 CN CN202110067282.7A patent/CN112865607A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102756660A (en) * | 2011-04-28 | 2012-10-31 | 吴宸至 | Automobile capable of saving oil by 50 percent |
| CN106532095A (en) * | 2016-10-12 | 2017-03-22 | 中国工程物理研究院化工材料研究所 | High-power-density electrolyte thermobattery and preparation method for porous carbon electrodes |
| CN106449961A (en) * | 2016-11-01 | 2017-02-22 | 中国工程物理研究院化工材料研究所 | Electrode structure of electrolyte thermobattery and electrolyte thermobattery preparation method |
| CN107681925A (en) * | 2017-10-26 | 2018-02-09 | 浙江大学 | A kind of residual heat using device of two-stage thermo-electric generation |
| CN112234220A (en) * | 2019-07-15 | 2021-01-15 | 张宇彻 | Thermoelectric cell |
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Application publication date: 20210528 |