Waste heat recovery device for hot air pipeline

Abstract

The utility model provides a waste heat recovery device for a hot air pipeline. The waste heat recovery device comprises a plurality of recovery modules which are arranged at intervals and wrap the outer side of the hot air pipeline. The recovery module comprises a heat conduction layer, a power generation module layer and an external protection layer which are sequentially arranged on the outer side of the hot air pipeline in a sleeving mode. The external protection layer comprises a ventilation heat dissipation layer arranged on the outer side of the power generation module layer and a waterproof covering layer arranged on the outermost side. The ventilation and heat dissipation layer comprises a back plate and a plurality of fins evenly distributed along the radial circumference of the pipeline. A heat dissipation cavity is formed between every two adjacent fins in a spaced mode, and the fins are arranged between the waterproof covering layer and the back plate. And the ventilation heat dissipation layer is made of an aluminum material. According to the recovery module, the heat exchange efficiency is improved through the heat conduction layer, the power generation efficiency is improved through connection of the power generation module layer and the heat conduction layer, and the collection rate of smoke heat energy is improved. The aluminum ventilation heat dissipation layer is arranged to improve the heat dissipation effect of the power generation module, a water cooling plate does not need to be added, and the weight of the waste heat recovery device is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, in particular to a waste heat recovery device for a hot air pipeline. Background Art

[0002] In the iron and steel industry, a large amount of waste heat is generated in the flue for steel production, as well as in wastewater and cooling beds. When the coke oven burns, coke oven gas above 300 °C is continuously discharged into the atmosphere, which not only causes a large amount of waste of heat resources, but also contaminates the environment with a large amount of pollutants mixed in the coke oven gas. Waste heat recovery can solve the problem of energy waste and bring considerable economic benefits.

[0003] In the coking process, the recoverable energy consumed by the coke oven mainly includes the sensible heat of red coke, the waste heat of flue gas, and the waste heat of raw coke oven gas, etc. Among them, the waste heat recovery of flue gas is to utilize the waste heat of the flue gas in the flue, transfer the waste heat to water or other media for other uses such as heating or power generation. The most important application of the recovered waste heat is to heat the boiler cooling water, reduce the consumption of natural resources, and at the same time reduce the discharged pollutants.

[0004] In the prior art, in order to collect and utilize the waste heat recovery of the flue gas passing through the pipeline, a thermoelectric conversion process is carried out by setting an external waste heat power generation device connected to the flue gas pipeline. The device has a complex structure, and the collection method of this method results in a low recovery efficiency of the pipeline and cannot achieve efficient collection of the waste heat of the flue gas. Content of the Utility Model

[0005] In view of this, the utility model aims to provide a waste heat recovery device for a hot air pipeline, which can improve the collection effect of the waste heat of the flue gas and achieve energy conservation, emission reduction and efficient utilization of resources.

[0006] To achieve the above object, the technical solution of the utility model is realized as follows:

[0007] A waste heat recovery device for a hot air pipeline includes a plurality of recovery modules arranged at intervals and wrapped outside the hot air pipeline;

[0008] The recovery module includes a heat conduction layer, a power generation module layer, and an external protection layer sequentially sleeved outside the hot air pipeline;

[0009] The external protection layer includes a ventilation and heat dissipation layer arranged outside the power generation module layer, and a waterproof covering layer arranged on the outermost side;

[0010] The ventilation and heat dissipation layer includes a back plate and a plurality of fins arranged circumferentially and evenly along the radial direction of the pipeline;

[0011] A heat dissipation cavity is formed by the interval between two adjacent fins, and the fins are arranged between the waterproof covering layer and the back plate;

[0012] The ventilation and heat dissipation layer is made of aluminum material.

[0013] Furthermore, the power generation module layer includes an upper connecting plate, a lower connecting plate, and a π-shaped unit arranged between the upper connecting plate and the lower connecting plate;

[0014] A number of the π-shaped units are arranged in series on the lower connecting plate, the lower connecting plate is coated on the outside of the heat conduction layer, and the upper connecting plate is in contact with and connected to the back plate.

[0015] Furthermore, the π-shaped units are arranged in series in a serpentine broken line.

[0016] Furthermore, the π-shaped unit includes a P-type electrode, an n-type electrode, and a connecting plate lapped between the P-type electrode and the n-type electrode;

[0017] The connecting plate is arranged at one end close to the upper connecting plate.

[0018] Furthermore, both the upper connecting plate and the lower connecting plate are made of copper material;

[0019] One end of the P-type electrode and the n-type electrode close to the lower connecting plate is the high-temperature end, and one end close to the upper connecting plate is the low-temperature end;

[0020] Both the P-type electrode and the n-type electrode are made of bismuth telluride material, and the connecting plate is made of copper material.

[0021] Furthermore, the heat conduction layer includes a base body and a clamping plate;

[0022] A number of spaced rectangular grooves are formed on the base body, and the clamping plate is clamped in the rectangular grooves;

[0023] Along the radial direction of the heat conduction layer, the base body and the clamping plate are arranged alternately, and the thicknesses of the base body and the clamping plate are equal.

[0024] Furthermore, the base body is made of copper material, and the clamping plate is made of graphite material.

[0025] Furthermore, the lengths of the heat conduction layer, the power generation module layer, and the external protection layer are equal.

[0026] Furthermore, the fin includes a rectangular section and a conical section connected to each other;

[0027] The width of the conical section gradually decreases from the rectangular section to the waterproof covering layer.

[0028] Further, ventilation plates are respectively arranged at both ends of the recovery module, and the ventilation plates are covered on the heat conduction layer, the power generation module layer, and the external protection layer;

[0029] The ventilation plate is provided with a through ventilation opening, and the ventilation opening gradually increases from the side of the recovery module to the outside.

[0030] Compared with the prior art, the utility model has the following advantages:

[0031] For the waste heat recovery device for the hot air duct of the utility model, by covering the recovery module on the outside of the hot air duct, the recovery module increases the heat exchange efficiency through the heat conduction layer, and improves the power generation efficiency by connecting the power generation module layer with the heat conduction layer, thereby improving the collection rate of flue gas heat energy. The heat dissipation effect of the power generation module is also improved by setting an aluminum ventilation and heat dissipation layer, without adding a water cooling plate, reducing the weight of the waste heat recovery device. And a plurality of fins are arranged in a circumferentially uniform distribution to form a heat dissipation cavity, further improving the heat dissipation effect.

[0032] In addition, by setting the π-shaped units in a serpentine broken line series arrangement, the layout is more compact and standardized, increasing the number of π-shaped units arranged, and improving the power generation efficiency. Both the P-type electrode and the n-type electrode are made of bismuth telluride material, and the lap joint plate is made of copper material, which can unify the materials of the π-shaped units, reducing the use and processing difficulty of multiple materials.

[0033] In addition, by setting a copper matrix and a graphite material splint in the heat conduction layer, the heat conduction performance can be significantly improved. Graphite can improve the heat dissipation ability of the matrix copper, and the connection between graphite and copper can improve the diffusion coefficient of graphite, thereby enhancing its heat conduction performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0035] Figure 1 is a three-dimensional structural schematic diagram of the waste heat recovery device for the hot air duct according to the embodiment of the present utility model;

[0036] Figure 2 is a front view schematic diagram of the waste heat recovery device for the hot air duct according to the embodiment of the present utility model;

[0037] Figure 3 is Figure 2 a cross-sectional schematic diagram at A-A in

[0038] Figure 4 is a three-dimensional structural schematic diagram of the power generation module layer according to the embodiment of the present utility model;

[0039] Figure 5 Schematic three-dimensional view of the power generation module layer described in the embodiment of the present utility model without an upper connection plate;

[0040] Figure 6 Top view of the power generation module layer described in the embodiment of the present utility model without an upper connection plate;

[0041] Figure 7 Developed view of the heat conduction layer described in the embodiment of the present utility model;

[0042] Figure 8 Partial screenshot of the ventilation and heat dissipation layer described in the embodiment of the present utility model;

[0043] Figure 9 Partial cross-sectional view of the ventilation plate described in the embodiment of the present utility model.

[0044] Explanation of reference numerals:

[0045] 1. Recycling module; 2. Hot air duct; 3. Ventilation plate;

[0046] 101. Heat conduction layer; 102. Power generation module layer; 103. External protection layer;

[0047] 301. Ventilation opening;

[0048] 1011. Substrate; 1012. Clamping plate;

[0049] 1021. Upper connection plate; 1022. Lower connection plate; 1023. π-shaped unit;

[0050] 1031. Fin; 1032. Waterproof covering layer; 1033. Back plate; 1034. Heat dissipation cavity;

[0051] 10231. P-type electrode; 10232. n-type electrode; 10233. Lapping plate;

[0052] 10311. Rectangular section; 10312. Tapered section. Detailed implementation manners

[0053] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0054] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "back", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0055] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with specific situations.

[0056] The present utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0057] This embodiment relates to a waste heat recovery device for a hot air duct 2. The waste heat recovery device includes a plurality of recovery modules 1 arranged at intervals and wrapped around the outside of the hot air duct 2. The recovery module 1 includes a heat conduction layer 101, a power generation module layer 102, and an external protection layer 103 that are sequentially sleeved on the outside of the hot air duct 2. The external protection layer 103 includes a ventilation and heat dissipation layer provided on the outside of the power generation module layer 102 and a waterproof covering layer 1032 provided on the outermost side. The ventilation and heat dissipation layer includes a back plate 1033 and a plurality of fins 1031 arranged circumferentially and uniformly along the radial direction of the duct. A heat dissipation cavity 1034 is formed by the interval between two adjacent fins 1031, and the fins 1031 are provided between the waterproof covering layer 1032 and the back plate 1033. The ventilation and heat dissipation layer is made of aluminum material.

[0058] For the waste heat recovery device for the hot air duct 2 in this embodiment, by covering and arranging the recovery module 1 on the outside of the hot air duct 2, the recovery module 1 increases the efficiency of heat exchange through the heat conduction layer 101, and improves the power generation efficiency by connecting the power generation module layer 102 to the heat conduction layer 101, thereby improving the collection rate of flue gas heat energy. The heat dissipation effect of the power generation module is also improved by setting an aluminum ventilation and heat dissipation layer, without adding a water cooling plate, reducing the weight of the waste heat recovery device. And a plurality of fins 1031 arranged circumferentially and uniformly are provided to form a heat dissipation cavity 1034, further improving the heat dissipation effect.

[0059] Based on the above overall introduction, an exemplary structure of the waste heat recovery device for the hot air duct 2 in this embodiment is as Figures 1 to 3As shown, the hot air duct 2 is cylindrical, and the recovery module 1 is sleeved outside the hot air duct 2 in sections. The distance between the recovery modules 1 can be adjusted adaptively according to costs and requirements, which is not limited here. Among them, the heat conduction layer 101, the power generation module layer 102, and the external protection layer 103 are in contact and connected to each other.

[0060] As a preferred embodiment, as Figures 3 to 5 shown, the power generation module layer 102 includes an upper connection plate 1021, a lower connection plate 1022, and a π-shaped unit 1023 disposed between the upper connection plate 1021 and the lower connection plate 1022. A number of π-shaped units 1023 are connected in series on the lower connection plate 1022. The lower connection plate 1022 is wrapped outside the heat conduction layer 101, and the upper connection plate 1021 is in contact and connected to the back plate 1033. Figure 3 and Figure 5 The figures represent the interception of a partial power generation module. Both the lower connection plate 1022 and the upper connection plate 1021 are circular ring-shaped plate structures, and the π-shaped units 1023 located between them are arranged according to the shapes of the upper connection plate 1021 and the lower connection plate 1022.

[0061] Furthermore, as Figure 5 and Figure 6 shown, the π-shaped units 1023 are arranged in series in a serpentine fold line. By arranging the π-shaped units 1023 in a serpentine fold line in series, the layout is more compact and standardized, the number of π-shaped units 1023 is increased, and the power generation efficiency is improved.

[0062] Specifically, as Figure 5 and Figure 6 shown, the π-shaped unit 1023 includes a P-type electrode 10231 and an n-type electrode 10232, and a lap plate 10233 lapped between the P-type electrode 10231 and the n-type electrode 10232. The lap plate 10233 is disposed at one end close to the upper connection plate 1021. Through the above-mentioned π-shaped unit 1023, a uniform heat flow field can be established outside the heat conduction layer 101, making the operating performance of the thermoelectric devices in the series integrated circuit uniform, and because it is completely wrapped outside the pipeline, it can avoid the situation of low power generation efficiency caused by different local temperature collection when collecting heat.

[0063] Furthermore, as Figures 1 to 5 shown, both the upper connection plate 1021 and the lower connection plate 1022 are made of copper. An insulating material is coated on the connection surfaces of the upper connection plate 1021 and the lower connection plate 1022 with the π-shaped unit 1023 to form an insulating layer, reducing the risk of current leakage and short circuit.

[0064] One end of the P-type electrode 10231 and the n-type electrode 10232 close to the lower connecting plate 1022 is the high-temperature end, and one end close to the upper connecting plate 1021 is the low-temperature end. Both the P-type electrode 10231 and the n-type electrode 10232 are made of bismuth telluride, and the overlapping plate 10233 is made of copper. With such a setting, the materials of the π-type unit 1023 can be unified, reducing the use and processing difficulty of multiple materials.

[0065] In addition, as Figure 7 shown, the heat conduction layer 101 includes a base body 1011 and a clamping plate 1012. A number of rectangular grooves are formed on the base body 1011 at intervals, and the clamping plate 1012 is clamped in the rectangular grooves. Along the radial direction of the heat conduction layer 101, the base body 1011 and the clamping plate 1012 are arranged alternately, and the thicknesses of the base body 1011 and the clamping plate 1012 are equal.

[0066] Furthermore, the base body 1011 is made of copper, and the clamping plate 1012 is made of graphite. By providing the copper base body 1011 and the graphite clamping plate 1012 in the heat conduction layer 101, the heat conduction performance can be significantly improved. Graphite can improve the heat dissipation ability of the copper base body 1011, and the connection between graphite and copper can increase the diffusion coefficient of graphite, thereby enhancing its heat conduction performance.

[0067] As a preferred embodiment, the lengths of the heat conduction layer 101, the power generation module layer 102, and the external protection layer 103 are equal, so as to ensure the structural standardization of the recovery module 1.

[0068] Preferably, as Figure 8 shown, the fin 1031 includes a rectangular section 10311 and a tapered section 10312 connected to each other. The width of the tapered section 10312 gradually decreases from the rectangular section 10311 to the waterproof covering layer 1032. By providing the tapered section 10312, the upper opening of the heat dissipation cavity 1034 is larger than the lower opening. Due to the principle of gas flow caused by thermal expansion and contraction, the hot air close to the rectangular section 10311 is more likely to flow to the tapered section 10312 and then be discharged, improving the heat dissipation effect.

[0069] In addition, as Figure 3 and Figure 9 shown, ventilation plates 3 are respectively provided at both ends of the recovery module 1, and the ventilation plates 3 cover the heat conduction layer 101, the power generation module layer 102, and the external protection layer 103. Through holes 301 are provided on the ventilation plates 3, and the openings of the through holes 301 gradually increase from the side of the recovery module 1 to the outside.

[0070] As Figure 3As shown, ventilation plates 3 are provided on both sides of the recycling module 1 to block the sides of the heat conduction layer 101, the power generation module layer 102, and the fin 1031 layer, preventing external dust or foreign objects from entering the power generation module layer 102, ensuring the performance of the above-mentioned layers, and avoiding the situations of heat collection and power generation failure.

[0071] And, as Figure 9 shown in, ventilation openings 301 are provided on the ventilation plates 3. The hot air accumulated in the heat dissipation cavity 1034 can circulate with the outside through the ventilation openings 301 to ensure the heat dissipation effect. Moreover, the outer diameter of the ventilation openings 301 is set to be smaller than the inner diameter, which conforms to the air circulation principle, accelerates the air flow speed, and can effectively reduce the temperature of the general heat dissipation layer.

[0072] As a preferred embodiment, the waterproof covering layer 1032 of this embodiment is a cylindrical structure wrapped around the outside of the fin 1031 layer. Its material is made of plastic. The fins 1031 and the back plate 1033 are both made of aluminum to improve the heat dissipation effect. The fins 1031 and the waterproof covering layer 1032 can be connected and fixed by plugging or bonding.

[0073] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A waste heat recovery device for a hot air duct, characterized in that: It includes a plurality of recovery modules (1) arranged at intervals and wrapped around the outside of the hot air duct; The recovery module (1) includes a heat conduction layer (101), a power generation module layer (102), and an external protection layer (103) sequentially sleeved on the outside of the hot air duct (2); The external protection layer (103) includes a ventilation and heat dissipation layer arranged on the outside of the power generation module layer (102), and a waterproof covering layer (1032) arranged on the outermost side; The ventilation and heat dissipation layer includes a back plate (1033) and a plurality of fins (1031) arranged circumferentially and evenly along the radial direction of the duct; A heat dissipation cavity (1034) is formed at intervals between two adjacent fins (1031), and the fins (1031) are arranged between the waterproof covering layer (1032) and the back plate (1033); The ventilation and heat dissipation layer is made of aluminum material.

2. The waste heat recovery device for a hot air duct according to claim 1, characterized in that: The power generation module layer (102) includes an upper connecting plate (1021), a lower connecting plate (1022), and a π-shaped unit (1023) arranged between the upper connecting plate (1021) and the lower connecting plate (1022); A plurality of the π-shaped units (1023) are connected in series on the lower connecting plate (1022), the lower connecting plate (1022) is wrapped around the outside of the heat conduction layer (101), and the upper connecting plate (1021) is in contact and connected with the back plate (1033).

3. The waste heat recovery device for a hot air duct according to claim 2, characterized in that: The π-shaped units (1023) are arranged in a series connection in a serpentine fold line.

4. The waste heat recovery device for a hot air duct according to claim 3, characterized in that: The π-shaped unit (1023) includes a P-type electrode (10231) and an n-type electrode (10232), and a connecting plate (10233) lapped between the P-type electrode (10231) and the n-type electrode (10232); The connecting plate (10233) is arranged at one end close to the upper connecting plate (1021).

5. The waste heat recovery device for a hot air duct according to claim 4, characterized in that: Both the upper connecting plate (1021) and the lower connecting plate (1022) are made of copper material; One end of the P-type electrode (10231) and the n-type electrode (10232) close to the lower connecting plate (1022) is the high-temperature end, and one end close to the upper connecting plate (1021) is the low-temperature end; Both the P-type electrode (10231) and the n-type electrode (10232) are made of bismuth telluride material, and the connecting plate (10233) is made of copper material.

6. The waste heat recovery device for a hot air duct according to claim 1, characterized in that: The heat conduction layer (101) includes a matrix (1011) and a clamping plate (1012); A plurality of rectangular grooves arranged at intervals are formed on the matrix (1011), and the clamping plate (1012) is clamped in the rectangular grooves; Radially along the heat conduction layer (101), the substrates (1011) and the clamping plates (1012) are arranged alternately, and the substrates (1011) and the clamping plates (1012) have the same thickness.

7. The waste heat recovery device for a hot air duct according to claim 6, wherein: The substrate (1011) is made of copper material, and the clamping plate (1012) is made of graphite material.

8. The waste heat recovery device for a hot air duct according to claim 1, wherein: The heat conduction layer (101), the power generation module layer (102), and the external protection layer (103) have the same length.

9. The waste heat recovery device for a hot air duct according to claim 1, wherein: The fins (1031) include a rectangular section (10311) and a tapered section (10312) connected to each other; The width of the tapered section (10312) gradually decreases from the rectangular section (10311) towards the waterproof covering layer (1032).

10. The waste heat recovery device for a hot air duct according to claim 1, wherein: Ventilation plates (3) are respectively provided at both ends of the recovery module (1), and the ventilation plates (3) are arranged to cover the heat conduction layer (101), the power generation module layer (102), and the external protection layer (103); The ventilation plates (3) are provided with through ventilation openings (301), and the ventilation openings (301) gradually increase in size from the side of the recovery module (1) towards the outside.

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