Flue gas waste heat thermoelectric power generation unit and modularized thermoelectric power generation heat collector

Abstract

The utility model discloses a flue gas waste heat thermoelectric power generation unit and a modularized thermoelectric power generation heat collector, which comprise a graphite water-cooling plate radiator with through holes, thermoelectric power generation sheets and a flue gas heat exchange cavity, a plurality of smoke heat exchange cavities are formed in the side faces of the two sides of the graphite water-cooling plate radiator, and set gaps are reserved between the smoke heat exchange cavities and the graphite water-cooling plate radiator. First heat conduction gaskets are attached to the lower surface of the upper smoke heat exchange cavity and the upper surface of the lower smoke heat exchange cavity respectively, and second heat conduction gaskets are attached to the upper surface and the lower surface of the graphite water cooling plate radiator respectively. The plurality of thermoelectric power generation sheets are distributed in a matrix between the first heat-conducting gasket and the second heat-conducting gasket, and the two surfaces of the thermoelectric power generation sheets are connected to the first heat-conducting gasket and the second heat-conducting gasket; the graphite water-cooling plate radiator is in circulating connection with an external water path, and the flue gas heat exchange cavity is connected to an external flue gas pipeline. The device has the advantages of being good in heat conduction performance, high in reliability and high in universality, effectively improves the waste heat power generation efficiency, and can be suitable for more scenes through modular recombination.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of thermoelectric power generation, in particular to flue gas waste heat thermoelectric power generation group and modular thermoelectric power generation collector. BACKGROUND

[0002] The hot flue gas generated in the sintering process of a steel enterprise has the characteristic of high calorific value, and the high-temperature flue gas among it has a relatively high recycling rate at present, which is generally used to produce steam for power generation or hot water preparation by using a boiler to recover the heat in the flue gas. However, the medium and low-temperature flue gas among it is rarely recycled, resulting in waste of energy and keeping the waste heat recovery in the sintering process at a low level.

[0003] Thermoelectric power generation technology is a direct power generation technology for converting heat energy into electric energy by using the physical characteristics of thermoelectric materials. Due to its simple structure, it is not limited by space and temperature conditions, and it does not need to be maintained, so it can be applied to various forms of heat sources.

[0004] At present, many literatures and patents study waste heat recovery thermoelectric power generation devices, but there are problems such as low heat exchange efficiency of the radiator, small temperature difference between the two ends of the thermoelectric power generation sheet, single device structure, and fixed number of modules. Therefore, how to improve the heat exchange efficiency of the radiator, increase the temperature difference between the two ends of the thermoelectric power generation sheet, and make the thermoelectric power generation device modularized to adapt to various heat source environments is the research direction of the technical personnel in the field. CONTENT OF THE UTILITY MODEL

[0005] In view of the above defects existing in the prior art, a flue gas waste heat thermoelectric power generation group and a modular thermoelectric power generation collector are provided, which have the characteristics of good heat conduction performance, high reliability, and strong universality, can effectively improve the waste heat power generation efficiency, and can be reorganized by modules to be suitable for more scenes.

[0006] The utility model adopts the technical scheme of:

[0007] In the first aspect, the flue gas waste heat thermoelectric power generation group comprises a graphite water-cooled plate radiator with a through hole, thermoelectric power generation sheets, and flue gas heat exchange cavity chambers. A plurality of flue gas heat exchange cavity chambers are arranged on both sides of the graphite water-cooled plate radiator, and a set gap is left between the flue gas heat exchange cavity chambers and the graphite water-cooled plate radiator. A first heat-conducting gasket is attached to the lower surface of the upper flue gas heat exchange cavity chamber and the upper surface of the lower flue gas heat exchange cavity chamber, respectively, and a second heat-conducting gasket is attached to the upper surface and the lower surface of the graphite water-cooled plate radiator, respectively. A plurality of thermoelectric power generation sheets are arranged in a matrix between the first heat-conducting gasket and the second heat-conducting gasket, and the two surfaces of the thermoelectric power generation sheets are connected to the first heat-conducting gasket and the second heat-conducting gasket. The graphite water-cooled plate radiator is connected to an external water circuit, and the flue gas heat exchange cavity chambers are connected to an external flue gas pipeline.

[0008] According to the technical scheme, the flue gas heat exchange cavity chamber is provided with an air inlet, a cavity body and an air outlet; a plurality of fins are arranged in the cavity body, and the flue gas heat exchange cavity chamber is divided into a plurality of independent flue gas heat exchange channels by the fins.

[0009] According to the technical scheme, the cavity body adopts a closed cavity structure, the plurality of fins are arranged in parallel, and the top and bottom of the fins are connected between the top wall and the bottom wall of the cavity body.

[0010] According to the technical scheme, the thermoelectric power generation sheet between the first and second heat-conducting gaskets is divided into a plurality of groups; the thermoelectric power generation sheets in the same group are arranged in a row between the first and second heat-conducting gaskets, and the thermoelectric power generation sheets in the same group are connected in series; and the thermoelectric power generation sheets in different groups are connected in parallel.

[0011] According to the technical scheme, the cold-end radiator uses soft water as a cold source.

[0012] According to the technical scheme, the thermoelectric power generation sheet is composed of a plurality of pairs of p-type thermoelectric materials and n-type thermoelectric materials.

[0013] According to the technical scheme, the thickness of a single first heat-conducting gasket is 0.5mm-2mm, and the thickness of a single second heat-conducting gasket is 1.5mm-3mm.

[0014] In a second aspect, a modular thermoelectric power generation collector is characterized in that it comprises the flue gas waste heat thermoelectric power generation group according to any one of the above, and a plurality of flue gas waste heat thermoelectric power generation groups are connected in parallel.

[0015] According to the technical scheme, the plurality of flue gas waste heat thermoelectric power generation groups are arranged in an array, and adjacent flue gas waste heat thermoelectric power generation groups are arranged in close contact with each other; and a heat insulation gasket is arranged on the side wall surface of the modular thermoelectric power generation collector.

[0016] According to the technical scheme, the modular thermoelectric power generation collector further comprises a water pool, a pipeline connected between the water pool and the graphite water-cooled plate radiator, and a circulating water pump arranged on the pipeline; in the modular thermoelectric power generation collector, the water inlets of the graphite water-cooled plate radiators of the thermoelectric power generation groups are respectively connected with the branch pipes of the soft water main pipe; and the water outlets of the graphite water-cooled plate radiators of the thermoelectric power generation groups are connected with another soft water pipeline and flow into the soft water pool.

[0017] The utility model has the following beneficial effects:

[0018] 1. In a single flue gas waste heat thermoelectric power generation group, the cold end radiator adopts a water-cooled graphite plate with holes, which has better heat dissipation performance than traditional water-cooled plates. Secondly, a first heat-conducting gasket is arranged between the thermoelectric power generation sheet and the flue gas heat exchange cavity, and a second heat-conducting gasket is arranged between the thermoelectric power generation sheet and the graphite water-cooled plate radiator. Compared with the heat-conducting silicone grease in the prior art, the heat-conducting gasket can withstand higher operating temperature, has higher thermal conductivity, and has longer service life. Finally, the flue gas waste heat thermoelectric power generation group can be modularly reorganized according to the installation position and size, the number of thermoelectric power generation groups can be adjusted, and multiple thermoelectric power generation collector groups can be combined together to generate power together, which has the characteristics of simple structure, modular composition, and strong universality. It is simple and easy to operate in engineering implementation, has strong temperature resistance, is suitable for environments with high heat source temperature such as steel plants, and does not involve high-precision instruments, so the cost is relatively low. It can effectively recover and utilize the heat source waste heat, and achieve the effect of energy saving and carbon reduction.

[0019] 2. The ribs evenly divide the cavity body into a plurality of separate flue gas heat exchange channels, increase the heat exchange area of the heat source (flue gas), and effectively improve the efficiency of heat transfer from the heat source to the hot end of the thermoelectric power generation module.

[0020] 3. The soft water has stronger insulation and fewer impurities, reduces the precipitation of calcium and magnesium salts, and reduces the heat transfer resistance

[0021] 4. Heat insulation gaskets are arranged on the sides of the modular thermoelectric power generation collector to prevent heat loss from the sides.

[0022] The above description is only a summary of the technical scheme of the present application. In order to more clearly understand the technical means of the present application, and can be implemented according to the content of the specification, the following will be described in detail with the preferred embodiments of the present application and the accompanying drawings. The specific implementation of the present application is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings described herein are used to provide a further understanding of the present application, and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application.

[0024] Figure 1 is a structural schematic view of a single flue gas waste heat thermoelectric power generation group provided by the embodiments of the present application;

[0025] Figure 2 is a schematic view of series and parallel connection of each thermoelectric power generation sheet provided by the embodiments of the present application;

[0026] Figure 3 is a structural schematic view of a modular thermoelectric power generation collector provided by the embodiments of the present application;

[0027] Figure 4It is the working principle diagram of the modular heat-electricity generation heat collector of the embodiment provided by the utility model;

[0028] In the figure, 1, graphite water cooling plate radiator; 2, thermoelectric power generation sheet; 3, flue gas heat exchange cavity chamber; 4, first heat-conducting gasket; 5, second heat-conducting gasket; 6, modular heat-electricity generation heat collector; 7, water tank; 8, water inlet; 9, water outlet; 10, medium-low temperature flue gas; 11, external electric equipment; 12, circulating soft water; 13, flue gas; 14, electric energy. DETAILED DESCRIPTION

[0029] The following description of the utility model is combined with the Figures 1-4 The principle and features of the utility model are described, and the examples are only used to explain the utility model, and are not used to limit the scope of the utility model. In the following paragraphs, the utility model is described in more detail with reference to the drawings. According to the following description and claims, the advantages and features of the utility model will be more clear. It should be noted that the drawings are very simplified and use non-precise proportions, and are only used to facilitate and clearly assist the purpose of explaining the embodiments of the utility model.

[0030] It should be noted that when a component is referred to as "fixed to" another component, it can be directly on the other component or there can be a middle component. When a component is referred to as "connected to" another component, it can be directly connected to the other component or there can be a middle component. When a component is referred to as "provided on" another component, it can be directly provided on the other component or there can be a middle component. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the utility model. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0032] Referring to Figures 1-4 As shown in the figure, the utility model provides a flue gas waste heat thermoelectric power generation set.

[0033] Embodiment 1

[0034] The application relates to a single flue gas waste heat thermoelectric power generation group, which comprises a water-cooled graphite plate radiator 1 with through holes, thermoelectric power generation sheets 2 and flue gas heat exchange cavity chambers 3; a plurality of flue gas heat exchange cavity chambers are arranged on the two sides of the water-cooled graphite plate radiator, and a set gap is reserved between the flue gas heat exchange cavity chambers and the water-cooled graphite plate radiator; a first heat-conducting gasket 4 is arranged on the lower surface of the upper flue gas heat exchange cavity chamber and the upper surface of the lower flue gas heat exchange cavity chamber respectively, and a second heat-conducting gasket 5 is arranged on the upper surface and the lower surface of the water-cooled graphite plate radiator respectively; the thermoelectric power generation sheets are arranged in a matrix between the first heat-conducting gasket and the second heat-conducting gasket, and the two surfaces of the thermoelectric power generation sheets are connected to the first heat-conducting gasket and the second heat-conducting gasket; the water-cooled graphite plate radiator is connected to an external water circulation, and the flue gas heat exchange cavity chambers are connected to an external flue gas pipeline.

[0035] In the single flue gas waste heat thermoelectric power generation group, the cold end radiator adopts a water-cooled graphite plate with through holes, and the heat dissipation performance is better than that of a traditional water-cooled plate. Secondly, the first heat-conducting gasket is arranged between the thermoelectric power generation sheets and the flue gas heat exchange cavity chambers, and the second heat-conducting gasket is arranged between the thermoelectric power generation sheets and the water-cooled graphite plate radiator. Compared with the heat-conducting silicone grease in the prior art, the heat-conducting gasket can bear a higher service temperature, has a higher heat conductivity coefficient and a longer service life.

[0036] Embodiment 2

[0037] The structure and principle of the embodiment 2 are close to those of the embodiment 1, and the difference lies in that the flue gas heat exchange cavity chamber is provided with an air inlet, a cavity body and an air outlet; a plurality of ribs are arranged in the cavity body, and the flue gas heat exchange cavity chamber is divided into a plurality of independent flue gas heat exchange channels by the ribs. The ribs divide the cavity body into a plurality of independent flue gas heat exchange channels, increase the heat exchange area of the heat source (flue gas 13) and improve the heat exchange efficiency.

[0038] In the embodiment 2, preferably, the cavity body adopts a closed cavity structure, the plurality of ribs are arranged in parallel, and the top and bottom of the ribs are connected between the top wall and the bottom wall of the cavity body respectively.

[0039] Embodiment 3

[0040] The structure and principle of the embodiment 3 are close to those of the embodiments 1 and 2, and the difference lies in that a preferred distribution mode of the thermoelectric power generation sheets is given; the thermoelectric power generation sheets between the first heat-conducting gasket and the second heat-conducting gasket are divided into a plurality of groups; the thermoelectric power generation sheets in the same group are arranged in a row between the first heat-conducting gasket and the second heat-conducting gasket, and the thermoelectric power generation sheets in the same group are connected in series; the thermoelectric power generation sheets in different groups are connected in parallel.

[0041] As shown in the figure, there are 50 thermoelectric generators between the first and second thermally conductive pads, arranged in a matrix of 5 columns × 10 rows. The positive and negative electrodes of the 10 thermoelectric generators in each column are connected in series, and the thermoelectric generators in the 5 columns are connected in parallel. The positive and negative electrode connection lines of the multiple thermoelectric generators are connected sequentially, and the positive electrode connection line of the first thermoelectric generator and the negative electrode connection line of the last thermoelectric generator are connected to an external circuit.

[0042] In Examples 1-3, the preferred cold-end radiator uses soft water as the cold source. Soft water has stronger insulation and contains fewer impurities, reducing the precipitation of calcium and magnesium salts and reducing heat transfer obstacles.

[0043] In Examples 1-3, the thermoelectric generator is composed of several pairs of p-type and n-type thermoelectric materials. In the example shown in the figure, the single thermoelectric generator uses a TEG thermal insulation pad 1-19913, with a size of 50mm × 50mm, and includes 199 pairs of p-type and n-type thermoelectric materials.

[0044] In Examples 1-3, the thickness of a single first thermal pad is 0.5mm to 2mm, and the thickness of a single second thermal pad is 1.5mm to 3mm; in the example shown in the figure, the thickness of a single first thermal pad is 1mm, and the thickness of a single second thermal pad is 2mm.

[0045] This utility model also provides a modular thermoelectric power generation collector 6, including any of the flue gas waste heat thermoelectric power generation units as described above, with multiple flue gas waste heat thermoelectric power generation units connected in parallel.

[0046] Preferably, multiple flue gas waste heat power generation units are arranged in an array, with adjacent units closely fitted together; heat insulation pads are provided on the sidewalls of the modular power generation collector. These heat insulation pads on the sides of the modular power generation collector prevent heat loss from the sides.

[0047] The modular thermoelectric power generation collector also includes a water tank 7, a pipe connecting the water tank and the graphite cold plate radiator, and a circulating water pump installed on the pipe; in the modular thermoelectric power generation collector, the water inlet 8 of the graphite cold plate radiator of each thermoelectric power generation unit is connected to each branch pipe of the soft water main pipe; the water outlet 9 of the graphite cold plate radiator of each thermoelectric power generation unit is connected to another soft water pipe and flows into the soft water tank, where the soft water is circulated.

[0048] like Figure 4 As shown, the medium-low temperature flue gas 10 enters the modular thermoelectric generator, and the waste heat is utilized by the thermoelectric generator to generate electricity 14, which is used to power external electrical equipment 11. During this process, a water tank provides circulating soft water 12 to the modular thermoelectric generator.

[0049] The flue gas waste heat thermoelectric power generation set can be modularly reorganized according to the installation position and size, the number of the thermoelectric power generation set is adjusted, and multiple thermoelectric power generation collector sets are combined together to generate power together, and the flue gas waste heat thermoelectric power generation set has the characteristics of simple structure, modular composition and strong universality; the engineering implementation is simple and easy to operate, the temperature resistance is strong, is suitable for the environment with high heat source temperature such as a steel plant, and does not involve high-precision instruments, so the cost is low; the waste heat of the heat source can be effectively recycled and utilized, and the effect of energy saving and carbon reduction is achieved.

[0050] The above is only a preferred embodiment of the present application, and does not limit the present application in any form; any person skilled in the art can smoothly implement the present application according to the drawings and the above description; however, any equivalent changes, modifications and evolutions made by those skilled in the art within the scope of the technical scheme of the present application, using the above disclosed technical content, are equivalent embodiments of the present application; at the same time, any equivalent changes, modifications and evolutions made according to the essential technology of the present application to the above embodiments are still within the protection scope of the technical scheme of the present application.

Claims

1. Flue gas waste heat thermoelectric power generation set, characterized in that: The application relates to a flue gas waste heat thermoelectric power generation group, which comprises a graphite water-cooled plate radiator, thermoelectric power generation sheets and flue gas heat exchange cavity chambers.

2. The flue gas waste heat electricity generating set according to claim 1, characterized in that: The flue gas heat exchange cavity chambers are arranged on the two side surfaces of the graphite water-cooled plate radiator, and a gap is reserved between the flue gas heat exchange cavity chambers and the graphite water-cooled plate radiator; first heat-conducting gaskets are arranged on the lower surface of the upper flue gas heat exchange cavity chamber and the upper surface of the lower flue gas heat exchange cavity chamber respectively, and second heat-conducting gaskets are arranged on the upper surface and the lower surface of the graphite water-cooled plate radiator respectively; the thermoelectric power generation sheets are arranged in a matrix between the first heat-conducting gaskets and the second heat-conducting gaskets, and the two surfaces of the thermoelectric power generation sheets are connected to the first heat-conducting gaskets and the second heat-conducting gaskets; the graphite water-cooled plate radiator is connected to an external water circulation system, and the flue gas heat exchange cavity chambers are connected to an external flue gas pipeline.

3. The flue gas heat recovery cogeneration unit of claim 2, wherein: The flue gas heat exchange cavity chamber is provided with an air inlet, a cavity body and an air outlet; a plurality of ribs are arranged in the cavity body, and the cavity body is divided into a plurality of independent flue gas heat exchange channels by the ribs.

4. The flue gas heat recovery cogeneration unit of claim 1, wherein: The cavity body adopts a closed cavity structure, the ribs are arranged in parallel between the cavity body, and the top and bottom of the ribs are connected between the top wall and the bottom wall of the cavity body.

5. The flue gas heat recovery cogeneration unit of claim 1, wherein: The thermoelectric power generation sheets between the first heat-conducting gaskets and the second heat-conducting gaskets are divided into a plurality of groups; the thermoelectric power generation sheets in the same group are arranged in a row between the first heat-conducting gaskets and the second heat-conducting gaskets, and the thermoelectric power generation sheets in the same group are connected in series; the thermoelectric power generation sheets in different groups are connected in parallel.

6. The flue gas heat recovery cogeneration unit of claim 1, wherein: Soft water is used as the cold source of the cold end radiator.

7. The flue gas heat recovery cogeneration unit of claim 1, wherein: The thermoelectric power generation sheets are composed of a plurality of pairs of p-type thermoelectric materials and n-type thermoelectric materials.

8. A modular thermoelectric power generating collector, characterized by: The thickness of a single first heat-conducting gasket is 0.5mm-2mm, and the thickness of a single second heat-conducting gasket is 1.5mm-3mm.

9. The modular thermoelectric power generating collector of claim 8, wherein: A plurality of flue gas waste heat thermoelectric power generation groups are connected in parallel.

10. The modular thermoelectric power generating collector of claim 8, wherein: The plurality of flue gas waste heat thermoelectric power generation groups are arranged in an array, and the adjacent flue gas waste heat thermoelectric power generation groups are arranged in close contact with each other; heat insulation gaskets are arranged on the side walls of the modular thermoelectric power generation collector. A water pool, a pipeline connected between the water pool and the graphite water-cooled plate radiator and a circulating water pump arranged on the pipeline are further included; in the modular thermoelectric power generation collector, the water inlets of the graphite water-cooled plate radiators of the thermoelectric power generation groups are connected to the branch pipes of a soft water main pipe respectively; and the water outlets of the graphite water-cooled plate radiators of the thermoelectric power generation groups are connected to another soft water pipeline and flow into a soft water pool.

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