Steel plant waste heat power generation device and system

Abstract

The utility model proposes a steel plant waste heat power generation device and its system. The steel plant waste heat power generation device includes a plurality of connected power generation units, each of which includes a thermoelectric power generation sheet and a collector and a cooler located on both sides thereof and connected thereto, wherein the collector adopts a fin structure, and the cooler adopts a water-cooled plate or a fin structure, and the thermoelectric power generation sheets of a plurality of power generation units are connected in series, and graphite thermal conductive gaskets are installed in the gaps between the thermoelectric power generation sheets and the collectors and coolers. The steel plant waste heat power generation device is equipped with graphite thermal conductive gaskets in the gaps between the thermoelectric power generation sheets and the collectors and coolers, so that the thermal resistance between the power generation sheets and the heat exchange surface is minimized, and the optimal thermal conductivity coupling is achieved, thereby improving the heat transfer coefficient and power generation efficiency of the power generation module, and can be suitable for the recovery of medium and low waste heat.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery power generation, and in particular to a steel plant waste heat power generation device and a system thereof. Background Art

[0002] Steel mills and other factories continue to emit a large amount of waste heat every day, but waste heat recovery below 200°C is difficult and uneconomical. Existing waste heat usually uses boilers to recover steam heat, and the boiler recycling method has a complex system and high maintenance costs for pressure equipment. Some use organic working fluid circulation for power generation, but the recovery efficiency is low, the economy is poor, the investment payback period is nearly 10 years, and it involves cumbersome operating procedures such as grid connection. Ultimately, a large amount of low-temperature waste heat is directly discharged, resulting in energy waste.

[0003] As the electrification and intelligence levels of steel mills continue to improve, the proportion of intelligent equipment and electric equipment continues to rise, and the demand for energy storage power supplies for these devices is gradually increasing. Therefore, a structure with simple structure and high thermal efficiency is needed to recover the waste heat from steel mill flue gas. Utility Model Content

[0004] The main purpose of the utility model is to provide a steel plant waste heat power generation device and a system thereof, which is intended to recover the waste heat of the steel plant and has high thermal efficiency.

[0005] To achieve the above-mentioned purpose, the utility model provides a steel plant waste heat power generation device, including multiple connected power generation units, each power generation unit includes a thermoelectric power generation sheet and a collector and a cooler located on both sides thereof and connected thereto, wherein the collector adopts a fin structure, and the cooler adopts a water-cooled plate or a fin structure, the thermoelectric power generation sheets of multiple power generation units are connected in series, and graphite thermal conductive gaskets are installed in the gaps between the thermoelectric power generation sheets and the collectors and coolers.

[0006] Preferably, a contact point is provided on a side of the thermoelectric power generation sheet of the power generation unit facing the thermoelectric power generation sheet of the adjacent power generation unit to electrically connect thereto.

[0007] Preferably, the heat collector comprises a graphite plate fitted with the thermoelectric power generation sheet and fins fixed on the outside of the graphite plate.

[0008] Preferably, the thermoelectric power generation sheet comprises a hot panel made of graphite, a cold panel made of metal and a semiconductor granular material located between the hot panel and the cold panel. The hot panel is fitted to the collector, and the cold panel is fitted to the cooler.

[0009] Preferably, a graphite thermally conductive gasket is provided between the hot panel and the graphite plate of the heat collector; and a graphite thermally conductive gasket is provided between the cold panel and the cooler.

[0010] Preferably, the steel plant waste heat power generation device further comprises a mounting bracket, all power generation units are mounted on the mounting bracket by snap-fits and the temperature difference power generation sheets of two adjacent power generation units are electrically connected via contact points.

[0011] Preferably, the temperature difference power generation sheets of two adjacent power generation units are connected by snap fastening.

[0012] Preferably, when the cooler adopts a water-cooled structure, the water-cooling channels of the coolers of all power generation units are interconnected.

[0013] The utility model further proposes a steel plant waste heat power generation system, comprising the above-mentioned steel plant waste heat power generation device, and also comprising an energy storage device or an inverter electrically connected to the temperature difference power generation sheet of the steel plant waste heat power generation device.

[0014] The steel plant waste heat power generation device proposed in the utility model has the following beneficial effects:

[0015] 1. Graphite heat-conducting gaskets are installed in the gaps between the temperature difference power generation sheet, the collector and the cooler, so that the thermal resistance between the power generation sheet and the heat exchange surface is minimized, and the best thermal conductivity coupling is achieved, thereby improving the heat transfer coefficient and power generation efficiency of the power generation module, which can be applied to the recovery of medium and low waste heat;

[0016] 2. The waste heat power generation device of this steel plant is light and easy to maintain. It can directly output electricity by connecting the energy storage device or inverter to the temperature difference power generation sheet. It does not have the pressure vessel and transmission equipment of the traditional waste heat boiler power generation system. The production operation and maintenance cost is low, safe and efficient;

[0017] 3. The modular design of connecting multiple temperature difference power generation sheets is adopted to facilitate production standardization and flexibly adapt to different process requirements;

[0018] 4. The conversion path from thermal energy to electrical energy is simple, efficient and simple in structure, which is in line with the characteristics of batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the main structure of the power generation unit in the first embodiment of the steel plant waste heat power generation device of the utility model when the fins are omitted;

[0020] Figure 2 It is a side structural schematic diagram of a power generation unit in the first embodiment of the steel plant waste heat power generation device of the utility model;

[0021] Figure 3 This is a schematic diagram of the main structure of the first embodiment of the steel plant waste heat power generation device of the utility model;

[0022] Figure 4 It is a schematic diagram of the main structure of the power generation unit in the second embodiment of the steel plant waste heat power generation device of the utility model when the fins are omitted;

[0023] Figure 5 It is a side structural schematic diagram of the power generation unit in the second embodiment of the steel plant waste heat power generation device of the utility model.

[0024] In the figure, 1-collector; 2-cooler; 3-thermoelectric power generation sheet; 4-first graphite thermal conductive gasket; 5-second graphite thermal conductive gasket; 6-insulating heat insulating gasket, 7-insulating gasket.

[0025] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] It should be noted that in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] The utility model provides a steel plant waste heat power generation device.

[0029] Reference Figures 1 to 3 The utility model proposes a first embodiment of a waste heat power generation device for a steel plant. In this embodiment, a waste heat power generation device for a steel plant includes a plurality of connected power generation units, each of which includes a thermoelectric power generation sheet 3 and a collector 1 and a cooler 2 located on both sides thereof and connected thereto, wherein the collector 1 adopts a fin structure, and the cooler 2 adopts a water-cooled plate or a fin structure, and the thermoelectric power generation sheets 3 of the plurality of power generation units are connected in series, and graphite thermal conductive gaskets are installed in the gaps between the thermoelectric power generation sheets 3 and the collector 1 and the cooler 2.

[0030] Specifically, the thermoelectric power generation sheet 3 of the power generation unit is provided with a contact point on the side facing the thermoelectric power generation sheet 3 of the adjacent power generation unit to electrically connect with it. The contact point is a convex point protruding from the outside of the flat plate, so that no wire is required, and the connection method of the contact points of two adjacent thermoelectric power generation sheets 3 is simpler and more convenient.

[0031] Furthermore, an insulating heat-insulating gasket 6 is provided at the gap outside the contact point of two adjacent thermoelectric power generation sheets 3. Since the contact point protruding from the outside is provided, the side of the thermoelectric power generation sheet 3 is uneven, and there will be a gap between the two adjacent thermoelectric power generation sheets 3 except for the contact point. The use of the insulating heat-insulating gasket 6 ensures the flatness of the overall structure on the one hand, and ensures the tight connection between the two adjacent thermoelectric power generation sheets 3 on the other hand.

[0032] In this embodiment, the heat collector 1 includes a graphite plate that is bonded to the thermoelectric power generation sheet 3 and fins that are located and fixed on the outer side of the graphite plate.

[0033] The thermoelectric power generation sheet 3 includes a hot panel made of graphite, a cold panel made of metal, and semiconductor granular materials located between the hot panel and the cold panel. The hot panel is attached to the collector 1, and the cold panel is attached to the cooler 2. The thermoelectric power generation sheet 3 adopts this structure to form a power generation module with high heat transfer coefficient and high efficiency. On the other hand, the hot panel made of graphite is connected to the collector 1, thereby solving the problem of difficulty and poor economy in medium and low temperature waste heat recovery, and the equipment investment payback period is less than 4 years.

[0034] Furthermore, a first graphite heat conductive pad 4 is provided between the hot panel and the graphite plate of the collector 1, and a second graphite heat conductive pad 5 is provided between the cold panel and the cooler 2. By providing the graphite heat conductive pads, it is ensured that the hot panel and the cold panel are in good contact with the collector 1 and the cooler 2 respectively.

[0035] Specifically, in this embodiment, a plurality of connected power generation units are connected to form a rectangular parallelepiped structure. The power generation unit adopts a modular design, and different numbers of modules are combined according to different power generation powers.

[0036] When the cooler 2 adopts a water-cooled structure, the water cooling channels of the coolers 2 of all power generation units are interconnected. Specifically, the waste heat power generation device of this steel plant also includes a mounting bracket, all power generation units are mounted on the mounting bracket by buckles, and the temperature difference power generation sheets 3 of two adjacent power generation units are electrically connected through contact points, so as to achieve high voltage of the module and thus achieve efficient transmission of electric energy. The temperature difference power generation sheets 3 of two adjacent power generation units are connected by buckles, so as to further improve the overall structural stability. An insulating gasket 7 is provided at the bottom of the mounting bracket to support the bottom of the temperature difference power generation sheet 3.

[0037] The working principle of the waste heat power generation device of this steel plant is as follows: the energy such as medium and low temperature exhaust gas or heat radiation discharged from the industrial process is absorbed by the collector 1 and transferred to the hot side of the power generation sheet (i.e., the hot panel), and the cold side of the power generation sheet (cold panel) is always kept at a low temperature by the cooler 2, so that the hot side and the cold side of the thermoelectric power generation sheet 3 maintain a certain temperature difference (50~250℃). The semiconductor granular material arranged inside the thermoelectric power generation sheet 3 generates an electromotive force and forms a current under the Seebeck effect, and the electric energy of multiple power generation sheet arrays is concentrated and transmitted to the energy storage device or inverter through the series and parallel connection of the circuit system, thereby completing the power generation process.

[0038] The steel plant waste heat power generation device proposed in this embodiment has the following beneficial effects:

[0039] 1. Graphite heat-conducting gaskets are installed in the gaps between the temperature difference power generation sheet 3 and the collector 1 and the cooler 2, so that the thermal resistance between the power generation sheet and the heat exchange surface is minimized, and the best thermal conductivity coupling is achieved, thereby improving the heat transfer coefficient and power generation efficiency of the power generation module, which can be applied to the recovery of medium and low waste heat;

[0040] 2. The waste heat power generation device of this steel plant is light and easy to maintain. It can directly output electricity by connecting the energy storage device or inverter to the temperature difference power generation sheet 3. It does not have the pressure vessel and transmission equipment of the traditional waste heat boiler power generation system. The production operation and maintenance cost is low, safe and efficient;

[0041] 3. The modular design of connecting multiple temperature difference power generation sheets 3 is adopted, which is convenient for production standardization and can also flexibly adapt to different process requirements;

[0042] 4. The conversion path from thermal energy to electrical energy is simple, efficient and simple in structure, which is in line with the characteristics of batteries.

[0043] Reference Figure 4 and Figure 5 The utility model proposes a second embodiment of a waste heat power generation device for a steel plant. The difference between this embodiment and the first embodiment is that in this embodiment, the cooler 2 adopts a fin structure. When the ambient temperature is low, the cooler 2 adopts a fin structure.

[0044] The utility model further proposes a steel plant waste heat power generation system.

[0045] In this preferred embodiment, a steel plant waste heat power generation system includes the above-mentioned steel plant waste heat power generation device, and also includes an energy storage device or an inverter electrically connected to the temperature difference power generation sheet 3 of the steel plant waste heat power generation device. The structure and beneficial effects of the steel plant waste heat power generation device refer to the above-mentioned embodiment and will not be repeated here.

[0046] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A steel plant waste heat power generation device, characterized in that: It comprises a plurality of connected power generation units, each of which comprises a thermoelectric power generation sheet and a collector and a cooler located on both sides thereof and connected thereto, wherein the collector adopts a fin structure, and the cooler adopts a water-cooled plate or a fin structure, the thermoelectric power generation sheets of the plurality of power generation units are connected in series, and graphite thermal conductive gaskets are installed in the gaps between the thermoelectric power generation sheets and the collectors and coolers.

2. The steel mill waste heat power generation device according to claim 1, characterized in that: A contact point is arranged on one side of the thermoelectric power generation sheet of the power generation unit facing the thermoelectric power generation sheet of the adjacent power generation unit to electrically connect with the thermoelectric power generation sheet.

3. The steel mill waste heat power generation device according to claim 2, characterized in that: An insulating heat-insulating gasket is arranged at the outer gap of the contact point between two adjacent temperature difference power generation sheets.

4. The steel plant waste heat power generation device according to claim 1, characterized in that: The heat collector comprises a graphite plate which is fitted with the thermoelectric power generation sheet and a fin which is fixed on the outer side of the graphite plate.

5. The steel mill waste heat power generation device according to claim 1, characterized in that: The thermoelectric power generation sheet comprises a hot panel made of graphite, a cold panel made of metal, and semiconductor granular material located between the hot panel and the cold panel. The hot panel is fitted with a heat collector, and the cold panel is fitted with a cooler.

6. The steel mill waste heat power generation device according to claim 5, characterized in that: A first graphite heat-conducting gasket is arranged between the hot panel and the graphite plate of the heat collector; and a second graphite heat-conducting gasket is arranged between the cold panel and the cooler.

7. The steel mill waste heat power generation device according to claim 1, characterized in that: It also includes a mounting bracket, all power generation units are mounted on the mounting bracket through buckles, and the temperature difference power generation sheets of two adjacent power generation units are electrically connected through contact points.

8. The steel mill waste heat power generation device according to claim 1, characterized in that: The temperature difference power generation sheets of two adjacent power generation units are connected by snap fasteners.

9. The steel mill waste heat power generation device according to any one of claims 1 to 8, characterized in that: When the cooler adopts a water-cooled structure, the water cooling channels of the coolers of all power generation units are interconnected.

10. A steel plant waste heat power generation system, characterized in that: It comprises the steel mill waste heat power generation device as claimed in any one of claims 1 to 9, and also comprises an energy storage device or an inverter electrically connected to the temperature difference power generation sheet of the steel mill waste heat power generation device.

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