CN111416550B - Thermoelectric power generation device with three layers of frameworks - Google Patents
Thermoelectric power generation device with three layers of frameworks Download PDFInfo
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- CN111416550B CN111416550B CN202010419069.3A CN202010419069A CN111416550B CN 111416550 B CN111416550 B CN 111416550B CN 202010419069 A CN202010419069 A CN 202010419069A CN 111416550 B CN111416550 B CN 111416550B
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Abstract
The invention provides a thermoelectric power generation device with three layers of frameworks, and relates to the technical field of waste heat utilization in the steel industry. The device comprises a protective cover, a framework, a steel ladle, a shell, a thermoelectric system and a water cooling system; the framework is a flat plate type support and made of steel, the protective cover is welded on the framework, the thermoelectric device is fixed on the framework through bolts, the thermoelectric device is of a three-layer structure consisting of a hot end framework, a thermoelectric system and a cold end framework, the water cooling system is arranged on the outer side of the cold end framework, and the device is composed of a cylinder with a regular hexagon section. The thermoelectric device has the characteristics of simple structure, environmental protection, easy operation, long service life and the like, and compared with a copper framework, the use of a steel framework is beneficial to reducing the cost and improving the mechanical stability of the thermoelectric module.
Description
Technical Field
The invention relates to the technical field of waste heat utilization in the steel industry, in particular to a thermoelectric power generation device with three layers of frameworks.
Background
The thermoelectric conversion technology can directly convert heat into electricity based on the seebeck effect, and has higher stability, lower manufacturing cost and longer service life compared with the traditional power generation technology because no mechanical moving part is arranged inside the thermoelectric conversion technology. In addition, the thermoelectric module has the characteristics of small volume, no pollution, no noise and the like, so that the thermoelectric module is widely applied to the field of industrial waste heat recovery. The traditional thermoelectric module can carry out air cooling or configuration cooling system with the cold junction in the use, makes the temperature difference produce in the module and generates electricity. However, in the air cooling state, the temperature difference between the cold end and the hot end of the module is not large, and the output power is small. And a cooling system is arranged at the cold end of the module, so that the use cost is high.
The temperature of the high-temperature end of one thermoelectric module is 140 ℃, and 4.64W of electric energy can be generated when the temperature of the low-temperature section is 25 ℃. Besides waste heat recovery of power plant flue gas, thermoelectric technology is widely applied to the field of metallurgy. The bear soldier combines the thermoelectric conversion technology with the blast furnace water slag flushing technology, and firstly adopts water flushingThe slag technology converts the waste heat of the slag into sensible heat of the slag flushing water, and then the thermoelectric generator is utilized to recover the heat of the slag flushing water, so that the waste heat of the blast furnace slag is utilized. The double-layer thermoelectric generator can realize the maximum output power of 440W/m2The conversion efficiency was 2.66%. The feasibility of the Xiaoying Long on the thermoelectric power generation in the steel industry is researched. The system analyzes from the technical and economic values, and provides a wide prospect for carrying out targeted waste heat thermoelectric recovery on waste heat resources with different temperatures, forms and scales.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a thermoelectric power generation device with a three-layer framework;
the technical scheme adopted by the invention is as follows:
a three-layer framework thermoelectric power generation device comprises a protective cover, a framework, a steel ladle, a shell, a thermoelectric system and a water cooling system;
the safety cover is formed by angle steel and galvanized iron plate welding, is triangle-shaped, and fixed welding is in on the skeleton, be located the device top, the skeleton is plate structure, the skeleton is the steel skeleton, the shell is the steel shell.
The ladle is positioned at the inner side of the thermoelectric device, and the side wall of the ladle is isolated from the thermoelectric device by air;
the thermoelectric system is of a multi-layer plate structure and comprises a hot end framework, two-stage thermoelectric modules and a cold end framework, wherein eight flat plate type two-stage thermoelectric modules form a regular octagonal cylindrical structure through a bolt fixing framework; the two-stage thermoelectric module comprises insulation plates, P-type thermoelectric arms, N-type thermoelectric arms and copper conducting plates, the two insulation plates are arranged in parallel, the copper conducting plates are fixedly arranged at opposite positions on the inner sides of the two insulation plates respectively, the P-type thermoelectric arms and the N-type thermoelectric arms are arranged in parallel between the two corresponding copper conducting plates, and the installation direction of the thermoelectric arms is perpendicular to the direction of the insulation plates; an air space is formed between the hot end framework and the side wall of the steel ladle, and meanwhile, the hot end framework receives radiant heat from the side wall of the steel ladle, eight hot end frameworks are fixed into an octahedral cylinder shape through bolts, and a cold end framework is fixed between the thermoelectric device and the peripheral water cooling system through bolts; and the two stages of thermoelectric modules, the hot end framework and the cold end framework are filled with heat-conducting silica gel.
The water cooling system is arranged on the outer side of the cold end framework and comprises a flow control valve, a water cooling radiator and a cooling water inlet and outlet, the water cooling radiator is arranged on the cold end framework, the flow control valve is arranged at the position of the cooling water inlet, and the cooling water inlet and outlet are connected with a cooling circulating water supply system of the continuous casting crystallizer; the outermost side of the water cooling system is fixed by the shell. The cooling circulating water supply system of the continuous casting crystallizer supplies cooling water for the device.
The selection of the framework material comprises the following steps:
step 1: establishing a physical model of the thermoelectric system by using numerical simulation software;
step 2: carrying out mesh division and wall surface naming on the physical model;
and step 3: checking the drawn grids, and calculating the thermoelectric power generation speed according to the size relation of the grids;
and 4, step 4: adding boundary conditions to the physical model, setting fixed constraint and temperature boundary conditions of the physical model, and adding the obtained temperature field distribution as a volume load to structural mechanics calculation for iterative calculation;
and 5: and selecting a material with obvious curve change as a framework material according to the calculation result.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
compared with a cylindrical structure, the thermoelectric device adopting the regular octagonal cylindrical structure can reduce the production difficulty and is easy to install, operate and maintain in later period; compared with the traditional copper framework, the steel framework is beneficial to improving the mechanical stability of the thermoelectric device, and the production cost is reduced to a certain extent.
Drawings
FIG. 1 is a schematic view of a thermoelectric power generation device side wall structure according to the present invention;
wherein, 1-a protective cover, 2-a steel ladle, 3-air, 4-a thermoelectric system and 5-a water cooling system;
FIG. 2 is a schematic cross-sectional view of a thermoelectric generation device in accordance with the present invention;
wherein, 2-ladle, 3-air, 4-thermoelectric system, 5-water cooling system, 6-shell;
FIG. 3 is a schematic view of a thermoelectric system of the thermoelectric power generation device of the present invention;
7-a steel ladle side wall, 8-a framework, 9-an insulating plate, 10-an N-type thermoelectric arm, 11-a P-type thermoelectric arm and 12-a copper conducting strip;
FIG. 4 is a schematic structural view of a two-stage thermoelectric module according to the present invention;
the device comprises a base, a plurality of insulating plates, a plurality of N-type thermoelectric arms, a plurality of P-type thermoelectric arms, a plurality of copper conducting strips and a plurality of insulating plates, wherein the insulating plates are 3-air, 9-insulating plates, the N-type thermoelectric arms, the P-type thermoelectric arms and the copper conducting strips are 10-P-type thermoelectric arms, and the copper conducting strips are 12-copper conducting strips;
FIG. 5 is a schematic diagram illustrating a process of operation of a software simulation framework material according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a software physical model modeling according to an embodiment of the present invention;
FIG. 7 is a graph illustrating the effect of different backbone materials on the maximum deflection in a thermoelectric leg according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
A thermoelectric power generation device with three layers of frameworks is shown in figures 1 and 2 and comprises a protective cover 1, a framework 8, a steel ladle 2, a shell 6, a thermoelectric system 4 and a water cooling system 5;
the protective cover 1 is formed by welding angle steel and galvanized iron plates, is triangular, is fixedly welded on the framework 8 and is positioned at the top end of the device, and the framework 8 is of a flat plate type structure;
the ladle 2 is positioned at the inner side of the thermoelectric device 4, and the side wall 7 of the ladle is isolated from the thermoelectric device 4 by air 3;
the thermoelectric system 4 is of a multi-layer plate structure and comprises a hot end framework, two-stage thermoelectric modules and a cold end framework, wherein eight flat plate type two-stage thermoelectric modules form a regular octagonal cylindrical structure through a bolt fixing framework 8; the two-stage thermoelectric module comprises insulation plates 9, P-type thermoelectric arms 11, N-type thermoelectric arms 10 and copper conducting plates 12, the two insulation plates 9 are arranged in parallel, the copper conducting plates 12 are fixedly arranged at opposite positions of the inner sides of the two insulation plates 9 respectively, the P-type thermoelectric arms 11 and the N-type thermoelectric arms 10 are arranged in parallel between the two corresponding copper conducting plates 12, and the mounting direction of the thermoelectric arms is perpendicular to the direction of the insulation plates 9; the two stages of thermoelectric modules, a hot end framework and a cold end framework are filled with heat-conducting silica gel, as shown in fig. 3 and 4, an air 3 gap exists between the hot end framework and a steel ladle side wall 7, and simultaneously, the heat-conducting silica gel receives radiant heat from the steel ladle side wall 7, eight hot end frameworks are fixed into an octahedral cylinder shape through bolts, and the cold end framework is fixed between a thermoelectric device and a peripheral water cooling system through bolts;
the water cooling system 5 is arranged on the outer side of the cold end framework and comprises a flow control valve, a water cooling radiator and a cooling water inlet and outlet, the water cooling radiator is arranged on the cold end framework, the flow control valve is arranged at the position of the cooling water inlet, and the cooling water inlet and outlet are connected with a cooling circulating water supply system of the continuous casting crystallizer; the outermost side of the water cooling system is fixed by the shell.
The cooling circulating water supply system of the continuous casting crystallizer supplies cooling water for the device.
In the embodiment, when framework material selection is performed, ANSYS Workbench is used for simulation operation analysis, a flow chart is shown in fig. 5, a physical model is firstly established in a calculation process, the physical model is shown in fig. 6, then, grid division and wall surface naming are performed on the physical model, whether a drawn grid is reasonable or not is checked, the grid size relation calculation speed is calculated, boundary conditions are added to the physical model, fixed constraints and temperature boundary conditions are set, the obtained temperature distribution is used as a body load and added to structural mechanics calculation for iterative calculation, simulation results are analyzed to obtain a result chart which is shown in fig. 7, the result chart is a result comparison chart corresponding to three material frameworks, and thermoelectric arm lengths with obvious calculation result changes are selected as research objects. From the result graph, it can be obviously obtained that compared with the use of a copper skeleton and an aluminum skeleton, the use of a steel skeleton has less influence on the deformation of the thermoelectric module, and the mechanical stability of the thermoelectric module is improved to a certain extent.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions and scope of the present invention as defined in the appended claims.
Claims (1)
1. A thermoelectric power generation device with a three-layer framework is characterized in that: the device comprises a protective cover, a framework, a steel ladle, a shell, a thermoelectric system and a water cooling system;
the protective cover is formed by welding angle steel and a galvanized iron plate, is triangular, is fixedly welded on the framework and is positioned at the top end of the device, and the framework is of a flat plate type structure;
the ladle is positioned at the inner side of the thermoelectric device, and the side wall of the ladle is isolated from the thermoelectric device by air;
the thermoelectric system is of a multi-layer plate structure and comprises a hot end framework, two-stage thermoelectric modules and a cold end framework, wherein eight flat plate type two-stage thermoelectric modules form a regular octagonal cylindrical structure through a bolt fixing framework; the two-stage thermoelectric module comprises insulation plates, P-type thermoelectric arms, N-type thermoelectric arms and copper conducting plates, the two insulation plates are arranged in parallel, the copper conducting plates are fixedly arranged at opposite positions on the inner sides of the two insulation plates respectively, the P-type thermoelectric arms and the N-type thermoelectric arms are arranged in parallel between the two corresponding copper conducting plates, and the installation direction of the thermoelectric arms is perpendicular to the direction of the insulation plates; an air space is formed between the hot end framework and the side wall of the steel ladle, and meanwhile, the hot end framework receives radiant heat from the side wall of the steel ladle, eight hot end frameworks are fixed into an octahedral cylinder shape through bolts, and a cold end framework is fixed between the thermoelectric device and the peripheral water cooling system through bolts;
the water cooling system is arranged on the outer side of the cold end framework and comprises a flow control valve, a water cooling radiator and a cooling water inlet and outlet, the water cooling radiator is arranged on the cold end framework, the flow control valve is arranged at the position of the cooling water inlet, and the cooling water inlet and outlet are connected with a cooling circulating water supply system of the continuous casting crystallizer; the outermost side of the water cooling system is fixed by the shell;
the two stages of thermoelectric modules, the hot end framework and the cold end framework are filled with heat-conducting silica gel;
the cooling circulating water supply system of the continuous casting crystallizer supplies cooling water for the device;
the framework is a steel framework, and the shell is a steel shell;
the selection of the framework material comprises the following steps:
step 1: establishing a physical model of the thermoelectric system by using numerical simulation software;
step 2: carrying out mesh division and wall surface naming on the physical model;
and step 3: checking the drawn grids, and calculating the thermoelectric power generation speed according to the size relation of the grids;
and 4, step 4: adding boundary conditions to the physical model, setting fixed constraint and temperature boundary conditions of the physical model, and adding the obtained temperature field distribution as a volume load to structural mechanics calculation for iterative calculation;
and 5: and selecting a material with obvious curve change as a framework material according to the calculation result.
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| CN202010419069.3A CN111416550B (en) | 2020-05-18 | 2020-05-18 | Thermoelectric power generation device with three layers of frameworks |
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| CN111416550B true CN111416550B (en) | 2021-10-08 |
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| CN106899236B (en) * | 2017-04-13 | 2018-11-27 | 东北大学 | A kind of thermoelectric generating device using ladle surface waste heat |
| CN110112958B (en) * | 2019-05-24 | 2020-08-28 | 西安交通大学 | Phase-change coupling bionic fin type automobile exhaust waste heat step power generation system |
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