Carbon-based high-temperature heat storage and release device and application thereof

Abstract

The present application relates to the technical field of heat storage, in particular to a carbon-based high-temperature heat storage and release device and application thereof, which comprises a heating and heat transfer unit, a heat storage unit and a heat exchange unit; the heat storage unit comprises a heat storage medium and a shell; the heat storage medium is contained in the shell for storing or releasing heat; the heating and heat transfer unit comprises a rotatable shaft and a heating and heat transfer body arranged on the surface of the shaft, and the heating and heat transfer body is arranged in the shell for heating and / or transferring heat to the heat storage medium; the heat exchange unit comprises a pipeline and a heat exchange medium, the pipeline penetrates through the heat storage medium, and the heat released by the heat storage medium is transported to an external heat exchange device through the heat exchange medium in the pipeline or external heat is transported to the heat storage medium through the heat exchange medium in the pipeline. The carbon-based high-temperature heat storage and release device has the characteristics of fast heat storage and release through multi-path heat storage of electricity and steam.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat storage, in particular to a carbon-based high-temperature heat storage and release device and application thereof. BACKGROUND

[0002] Heat storage technology is of great significance for industrial waste heat, renewable energy and other discontinuous energy application occasions. At present, the heat storage and release device has the following problems: 1) single heat storage mode, only one of heat storage or electric storage is used in the heat storage device; 2) low heat storage and release efficiency, in the current electric storage process, high-temperature resistant metal materials are usually used as heating conductors, and phase change materials represented by molten salt or solid materials represented by magnesium bricks are used as heat storage materials. Because the thermal conductivity of the above-mentioned materials is very low (the thermal conductivity of molten salt is ≤0.12 W / m.k, and the thermal conductivity of solid magnesium brick is ≤2 W / m.k), it is difficult to quickly store and release heat. When the steam turbine generator unit of the thermal power plant is frequency-regulated, high-temperature steam needs to be stored and released, which requires fast heat storage and release. Because of the slow heat storage and release rate of the heat storage material and device, the requirements of frequency regulation and peak shaving cannot be met. SUMMARY

[0003] The purpose of the present application is to overcome the problem of difficult fast heat storage and release of the existing heat storage device, and to provide a carbon-based high-temperature heat storage and release device. The carbon-based high-temperature heat storage and release device stores heat through multiple paths of electricity and steam, and has the characteristics of fast heat storage and release.

[0004] According to the first aspect of the present application, the present application provides a carbon-based high-temperature heat storage and release device, a heating and heat transfer unit, a heat storage unit and a heat exchange unit.

[0005] The heat storage unit comprises a heat storage medium and a shell; the heat storage medium is contained in the shell for storing or releasing heat;

[0006] The heating and heat transfer unit comprises a rotatable shaft body and a heating and heat transfer body arranged on the surface of the shaft body, and the heating and heat transfer body is arranged in the shell for heating and / or transferring heat to the heat storage medium;

[0007] The heat exchange unit comprises a pipeline and a heat exchange medium, the pipeline penetrates through the heat storage medium, and the heat exchange medium in the pipeline transfers the heat released by the heat storage medium to the external heat exchange equipment or transfers the external heat to the heat storage medium.

[0008] According to the second aspect of the present application, the present application provides an application of the carbon-based high-temperature heat storage and release device in thermal power frequency regulation and peak shaving, residential heating or high-temperature industrial steam.

[0009] Compared with the prior art, the carbon-based high-temperature heat storage and release device provided by the application integrates heating and heat transfer strengthening; a rotatable carbon-based heating and heat transfer body is arranged in the carbon-based high-temperature heat storage and release device, the heat conduction efficiency is improved, the carbon-based high-temperature heat storage and release device can realize rapid heat storage and release, and the carbon-based heating and heat transfer body can also serve as a heating component, so that heating and heat transfer strengthening are integrated, and the heat storage efficiency of the carbon-based high-temperature heat storage and release device is improved; through the heat exchange unit and the heating and heat transfer strengthening unit, heat storage can be achieved through multiple paths of electricity and steam; the carbon-based high-temperature heat storage and release device has a heat conduction rate at least 25 times higher than that of a current heat storage device, and the heat storage temperature can reach at least 800 DEG C or above.

[0010] The carbon-based high-temperature heat storage and release device provided by the application is particularly suitable for frequency modulation and peak regulation of a thermal power plant in winter, the carbon-based high-temperature heat storage and release device can be matched with a thermal power unit to simultaneously achieve the functions of peak regulation and frequency modulation, effectively improves the peak regulation capacity of the current thermal power unit in the winter heating period, and can expand the peak regulation range of the thermal power unit from the current 40% to 100% to -50% to 100%; the carbon-based high-temperature heat storage and release device can be matched with a wind power unit, so that the wind power consumption ratio is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a top view schematic diagram of the carbon-based high-temperature heat storage and release device provided by a preferred embodiment of the application;

[0012] Figure 2 is a front view schematic diagram of the carbon-based high-temperature heat storage and release device provided by a preferred embodiment of the application;

[0013] Figure 3 is a structure schematic diagram of the carbon-based high-temperature heating body provided by a preferred embodiment of the application.

[0014] REFERENCE SIGNS

[0015] 1 - second passage of heat exchange medium; 2 - carbon-based heating and heat transfer body; 3 - phase change material; 4 - shell; 5 - first passage of heat exchange medium; 6 - positive contact plate; 7 - insulation chamber; 8 - gear box; 9 - motor; 10 - shaft body; 11 - negative contact plate. DETAILED DESCRIPTION

[0016] The endpoints of the ranges and any values disclosed herein are not limited to the precise values stated. The endpoints of the ranges and the values are approximate values and should be understood to include values approximately near these ranges and values within these ranges. For ranges, the endpoints are included within the ranges, and the ranges are inclusive of the single values and the individual points within the ranges. The ranges can be combined with other ranges or values to form new ranges.

[0017] In the present application, the orientation words such as "upper", "lower", "left", "right" used without the opposite description generally refer to the upper, lower, left and right shown in the drawings; "inner" and "outer" refer to the inner and outer relative to the contour of each component itself.

[0018] It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0019] According to a first aspect of the present application, the present application provides a carbon-based high-temperature heat storage and release device, which comprises a heating and heat transfer unit, a heat storage unit and a heat exchange unit;

[0020] The heat storage unit comprises a heat storage medium and a shell; the heat storage medium is contained in the shell for storing or releasing heat;

[0021] The heating and heat transfer unit comprises a rotatable shaft body and a heating and heat transfer body arranged on the surface of the shaft body, and the heating and heat transfer body is arranged in the shell for heating and / or transferring heat to the heat storage medium;

[0022] The heat exchange unit comprises a pipeline and a heat exchange medium, the pipeline penetrates through the heat storage medium, and the heat released by the heat storage medium is transported to an external heat exchange device through the heat exchange medium in the pipeline or external heat is transported to the heat storage medium through the heat exchange medium in the pipeline. The carbon-based heating and heat transfer body is arranged in the carbon-based high-temperature heat storage and release device, which improves the heat conduction efficiency, enables the carbon-based high-temperature heat storage and release device to realize rapid heat storage and release, and enables the carbon-based heating and heat transfer body to also serve as a heating component, thereby improving the heat storage efficiency of the carbon-based high-temperature heat storage and release device; through the heat exchange unit and the heating and heat transfer unit, heat can be stored through multiple paths of electricity and steam.

[0023] According to a preferred embodiment of the present application, the carbon-based heating and heat transfer body comprises flaky graphite and liquefied pitch; preferably, the weight ratio of flaky graphite to liquefied pitch in the carbon-based heating and heat transfer body is 60-80:20-40; which is conducive to improving the heat storage and release efficiency of the carbon-based high-temperature heat storage and release device.

[0024] According to a preferred embodiment of the present application, the carbon-based heating and heat transfer body has an electrical resistivity of 100-400 μΩm.

[0025] According to the present application, the present application provides a structural diagram of a carbon-based high-temperature heat storage and release device and a structural diagram of a carbon-based heating and heat transfer body, as shown in Figure 2 、 Figure 3 The heat storage unit includes a heat storage medium 3 and a shell 4; the heat storage medium 3 is contained in the shell 4 for heat storage or release;

[0026] The heating and heat transfer unit is used for heating and / or transferring heat to the heat storage medium 3, including a rotatable shaft body 10, a carbon-based heating and heat transfer body 2 arranged on the surface of the shaft body 10, a negative electrode contact plate 11 and a positive electrode contact plate 6; the carbon-based heating and heat transfer body 2 penetrates the heat storage medium 3 and is arranged inside the shell 4; one end of the carbon-based heating and heat transfer body 2 is in contact with the negative electrode contact plate 11, and the other end is in contact with the positive electrode contact plate 6, and the negative electrode contact plate 11 and the positive electrode contact plate 6 are arranged inside the shell 4; the negative electrode contact plate 11 and the positive electrode contact plate 6 are electrified, and the current passes through the carbon-based heating and heat transfer body 2 to realize the heating function, realize the electric heat storage, and the heating and the strengthened heat transfer are integrated; which is conducive to improving the heat storage and release efficiency of the carbon-based high-temperature heat storage and release device.

[0027] According to a preferred embodiment of the present application, the carbon-based heating and heat transfer body 2 is in the shape of a heat transfer fin, which is conducive to improving the heat storage and release efficiency of the carbon-based high-temperature heat storage and release device.

[0028] According to a preferred embodiment of the present application, an insulating chamber 7 is arranged between the positive electrode contact plate 6 and / or the negative electrode contact plate 11 and the shell 4.

[0029] According to a preferred embodiment of the present application, the heat storage medium 3 includes a phase change material; preferably, the phase change material is selected from one or more of carbon-based water and salt, carbon-based paraffin; which is conducive to improving the heat storage and release efficiency of the carbon-based high-temperature heat storage and release device.

[0030] According to a preferred embodiment of the present application, the shell (4) is formed by a material selected from one or more of concrete, carbon-based high-strength heat storage carbon block, silicon oxide, metal; which is conducive to improving the heat storage and release efficiency of the carbon-based high-temperature heat storage and release device.

[0031] According to a preferred embodiment of the present application, the heat exchange unit includes a pipeline penetrating the heat storage medium 3 and a heat exchange medium in the pipeline, and the heat exchange medium in the pipeline is used to transport the heat released by the heat storage medium 3 to an external heat exchange device or to transport external heat to the heat storage medium 3 through the heat exchange medium in the pipeline; preferably, the heat exchange medium is selected from one of air, water-steam, heat-conducting oil, nitrogen or carbon dioxide; which is conducive to improving the heat storage and release efficiency of the carbon-based high-temperature heat storage and release device.

[0032] According to the application, the heat exchange medium outlet and inlet of the pipeline can be arranged on the carbon-based high-temperature heat storage and release device according to actual needs, for example, arranged on the top of the carbon-based high-temperature heat storage and release device, as shown in the figure. Figure 1 As shown in the figure, the heat exchange medium first channel 5 and the heat exchange medium second channel 1 of the pipeline are arranged on the top of the carbon-based high-temperature heat storage and release device.

[0033] When the carbon-based high-temperature heat storage and release device needs to release heat and deliver heat to an external heat exchange device, the heat exchange medium carries the heat released by the heat storage device to flow out through the heat exchange medium first channel 5, and after delivering heat to the external heat exchange device, the heat exchange medium flows into the carbon-based high-temperature heat storage and release device from the heat exchange medium second channel 1, so as to realize heat release.

[0034] When the carbon-based high-temperature heat storage and release device needs to store heat, the heat exchange medium carries external heat to flow into the carbon-based high-temperature heat storage and release device through the heat exchange medium second channel 1, and after heat exchange to the heat storage medium 3, the heat exchange medium flows out from the heat exchange medium first channel 5, so as to realize heat storage.

[0035] According to a preferred embodiment of the application, the surface of the shaft body 10 located outside the heat storage unit is provided with heat transfer enhancement fins, which is beneficial to improve the overall heat transfer efficiency of the device.

[0036] According to a preferred embodiment of the application, the pipeline spirally penetrates the heat storage medium 3, which is beneficial to improve the heat storage and release efficiency of the carbon-based high-temperature heat storage and release device.

[0037] According to a preferred embodiment of the application, the pipeline and the carbon-based heating and heat transfer body 2 are not in contact with each other, which is beneficial to improve the heat storage and release efficiency of the carbon-based high-temperature heat storage and release device.

[0038] According to a preferred embodiment of the application, a power source for rotating the heating and heat transfer unit is provided, and the heating and heat transfer unit further comprises a gear box 8 and a motor 9 arranged outside the heat storage unit and connected with the shaft body 10, which is beneficial to improve the heat storage and release efficiency of the carbon-based high-temperature heat storage and release device.

[0039] The carbon-based high-temperature heat storage and release device of the application is compared with a molten salt heat storage system with the same heating power, and the results are shown in Table 1.

[0040] Table 1

[0041]

[0042]

[0043] The carbon-based high-temperature heat storage and release device has a heat conductivity at least 25 times higher than that of a molten salt heat storage device, and the heat storage temperature can reach at least 800 DEG C or above, and the maximum heat storage temperature can reach 1200 DEG C.

[0044] According to a second aspect of the present application, the present application provides application of the carbon-based high-temperature heat storage and release device in thermal power frequency modulation and peak shaving, residential heating or high-temperature industrial steam.

[0045] In the application of thermal power frequency modulation and peak shaving, during valley electricity, the electric energy is converted into heat by the carbon-based heating and heat transfer body 2, and the heat is stored in the heat storage medium 3 or the excess heat of the thermal power unit is delivered to the heat storage medium 3 through the heat exchange medium, so that the carbon-based high-temperature heat storage and release device stores heat; when the electric load is high, the heat in the heat storage medium 3 is released, and the heat is delivered to the power generation system through the heat exchange medium in the pipeline for power generation peak shaving.

[0046] The application of thermal power frequency modulation and peak shaving includes four operating conditions, as shown in Table 2.

[0047] Table 2

[0048]

[0049] The operation mode of the operating condition 2 is that the carbon-based high-temperature heat storage and release device is in a heat release state during the period of low electric load and high thermal load, the motor 9 is put into operation, and the heat exchange rate of the heat storage medium 3 and the heat exchange medium is strengthened. If the unit output is still higher than the electric load at this time, the carbon-based heating and heat transfer body 2 is powered to heat, and the excess electric energy is converted into high-temperature heat energy and stored in the carbon-based high-temperature heat storage and release device.

[0050] Taking the transition from the operating condition 1 to the operating condition 4 as an example, when the electric load and the thermal load are low, the heat fluid pipeline valve is opened, the carbon-based heating and heat transfer body 2 is put into operation, and the motor 9 is started, so that the external heat fluid is input into the heat storage medium 3 through the heat exchange medium second passage 1. Since the motor 9 is started, the shaft body 10 is driven by the motor 9, and the heat exchange rate of the heat storage medium 3 and the heat exchange medium is strengthened. When the temperature difference between the heat exchange medium first passage 5 and the heat storage medium 3 is lower than 50 DEG C, the carbon-based heating and heat transfer body 2 is put into operation, and the valley electricity is used to further heat the heat storage medium to 800 DEG C. When the electric load and the thermal load are high, the carbon-based high-temperature heat storage and release device is switched to a heat release mode, and the motor 9 is started, so that the high-temperature heat energy of the heat storage medium 3 is released through the heat exchange medium first passage 5. Since the motor 9 is started, the shaft body 10 is driven by the motor 9, and the heat exchange rate of the heat storage medium 3 and the heat exchange medium is strengthened.

[0051] The carbon-based high-temperature heat storage and release device has high heat conductivity, and the heat storage temperature can reach at least 800 DEG C or above, so that the current thermal power unit winter heating period peak regulation capacity can be effectively improved, and the thermal power unit peak regulation range can be expanded from the current 40% to 100% to-50% to 100%; the carbon-based high-temperature heat storage and release device can be matched with a wind power unit, so that the wind power consumption proportion can be greatly improved.

[0052] The above describes the preferred embodiments of the present application, but the present application is not limited thereto. Within the technical concept of the present application, various simple modifications can be made to the technical solutions of the present application, including that various technical features are combined in any other suitable manner, and these simple modifications and combinations should also be considered as the disclosed content of the present application, and all fall within the protection scope of the present application.

Claims

1. A carbon-based high-temperature heat storage and release device, characterized in that, The device includes: a heating and heat transfer unit, a heat storage unit, and a heat exchange unit; The heat storage unit includes a heat storage medium and a shell; the heat storage medium is placed inside the shell for storing or releasing heat; The heating and heat transfer unit includes a rotatable shaft and a heating and heat transfer element disposed on the surface of the shaft. The heating and heat transfer element is disposed inside the housing and is used to generate heat and / or transfer heat to the heat storage medium. The heat exchange unit includes pipes and a heat exchange medium. The pipes pass through the heat storage medium and the heat released by the heat storage medium is transported to an external heat exchange device through the heat exchange medium in the pipes or external heat is transported to the heat storage medium through the heat exchange medium in the pipes. The heating and heat transfer unit includes a carbon-based heating and heat transfer body, which includes flake graphite and liquefied asphalt.

2. The carbon-based high-temperature heat storage and release device according to claim 1, wherein, In the carbon-based heating and heat transfer body, the weight ratio of flake graphite to liquefied asphalt is 60-80:20-40; and / or The resistivity of the carbon-based heating and heat transfer medium is between 100 and 400 μΩm.

3. The carbon-based high-temperature heat storage and release device according to claim 1 or 2, wherein, The heat storage unit includes a heat storage medium (3) and a shell (4); the heat storage medium (3) is placed inside the shell (4) for heat storage or release; The heating and heat transfer unit includes a rotatable shaft (10), a carbon-based heating and heat transfer body (2) disposed on the surface of the shaft (10), a negative electrode contact plate (11), and a positive electrode contact plate (6); the carbon-based heating and heat transfer body (2) penetrates the heat storage medium (3) and is disposed inside the shell (4); one end of the carbon-based heating and heat transfer body (2) is in contact with the negative electrode contact plate (11), and the other end is in contact with the positive electrode contact plate (6), and the negative electrode contact plate (11) and the positive electrode contact plate (6) are disposed inside the shell (4).

4. The carbon-based high-temperature heat storage and release device according to claim 3, wherein, The carbon-based heating and heat transfer body (2) is shaped as heat transfer fins.

5. The carbon-based high-temperature heat storage and release device according to claim 3, wherein, An insulating chamber (7) is provided between the positive electrode contact plate (6) and / or the negative electrode contact plate (11) and the housing (4).

6. The carbon-based high-temperature heat storage and release device according to claim 3, wherein, The heat storage medium (3) includes a phase change material, which is selected from one or more of carbon-based water and salt, and carbon-based paraffin; and / or The shell (4) is formed of one or more materials selected from concrete, carbon-based high-strength thermal storage carbon blocks, silicon dioxide, and metal.

7. The carbon-based high-temperature heat storage and release device according to claim 6, wherein, The heat exchange unit includes a pipe that runs through the heat storage medium (3) and a heat exchange medium inside the pipe. The heat released by the heat storage medium (3) is transported to an external heat exchange device through the heat exchange medium in the pipe, or external heat is transported to the heat storage medium (3) through the heat exchange medium in the pipe.

8. The carbon-based high-temperature heat storage and release device according to claim 7, wherein, The heat exchange medium is selected from one of air, water-steam, heat transfer oil, nitrogen, or carbon dioxide.

9. The carbon-based high-temperature heat storage and release device according to claim 7, wherein, The pipe spirally penetrates the heat storage medium (3).

10. The carbon-based high-temperature heat storage and release device according to claim 9, wherein, The pipe is not in contact with the carbon-based heating and heat transfer body (2).

11. The carbon-based high-temperature heat storage and release device according to claim 3, wherein, The heating and heat transfer unit also includes a gearbox (8) and a motor (9) located outside the heat storage unit and connected to the shaft (10).

12. The application of the carbon-based high-temperature heat storage and release device according to any one of claims 1-11 in thermoelectric frequency regulation and peak shaving, residential heating or high-temperature industrial steam.

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