CN107218832B - Sand and stone heat storage method with carbon heat conduction surface layer and device thereof - Google Patents
Sand and stone heat storage method with carbon heat conduction surface layer and device thereof Download PDFInfo
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- CN107218832B CN107218832B CN201710585597.4A CN201710585597A CN107218832B CN 107218832 B CN107218832 B CN 107218832B CN 201710585597 A CN201710585597 A CN 201710585597A CN 107218832 B CN107218832 B CN 107218832B
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- sand
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0056—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using solid heat storage material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D2020/0004—Particular heat storage apparatus
- F28D2020/0013—Particular heat storage apparatus the heat storage material being enclosed in elements attached to or integral with heat exchange conduits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D2020/0065—Details, e.g. particular heat storage tanks, auxiliary members within tanks
- F28D2020/0078—Heat exchanger arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Abstract
The invention relates to a sand and stone heat storage method with carbon heat conduction surface layers and a device thereof, wherein sand and stone with carbon heat conduction surface layers are filled in a heat storage system of a closed container, graphite powder is filled in gaps among the sand and stone, the sand and stone heat storage device is provided with a closed container with an inlet pipe orifice and an outlet pipe orifice, sand and stone with carbon heat conduction surface layers are filled in the closed container, heat transfer fluid medium pipelines are distributed in the sand and stone with carbon heat conduction surface layers, and graphite powder is filled in the gaps among the sand and stone. The invention makes carbon heat-conducting layer on the sand surface layer, changes the heat-conducting property of sand, and can complete heat charging and heat releasing in a shorter time, thereby properly reducing the distribution density of the fluid pipeline in the heat storage system of the closed container, reducing the pipeline resistance and reducing the power and the cost of the heat storage engineering.
Description
Technical Field
The invention belongs to the technical field of heat storage, and relates to a sand stone heat storage method with a carbon heat conduction surface layer and a device thereof.
Background
In the technical field of heat storage, the adoption of low-cost and easily-obtained sand stone as a heat storage material is always a pursuing target of related technological workers. However, the sand has small heat conductivity coefficient, and the sand is used as a heat storage material to transfer heat slowly, so that heat transfer fluid medium pipelines with large distribution density are needed, the resistance of the fluid pipelines and the power of a conveying pump are increased, and the cost of the heat storage engineering is high.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provide the sandstone heat storage method with the carbon surface layer and the device thereof, which have reasonable design scheme, are easy to implement and apply and can reduce the cost of heat storage engineering under the condition of meeting the heat storage requirement.
Technical solutions adopted to achieve the above object are as follows.
The invention relates to a sand stone heat storage method with a carbon heat conduction surface layer, which is characterized in that: the airtight container heat storage system is filled with sand, the surface of the sand is provided with carbon heat conduction surface layers, gaps among the sand are filled with graphite powder, heat transfer fluid medium pipelines filled with heat conduction oil or molten salt are distributed in the sand with the carbon heat conduction surface layers, heat exchange is carried out between the heat transfer fluid medium pipelines and the sand, heat filling and heat release are completed, and inert nitrogen and oxygen gas is filled in the space at the upper part of the airtight container heat storage system. Because the coefficient of heat conductivity of carbon is more than 60 times of that of sand, a carbon heat conducting layer is manufactured on the surface layer of sand, the heat conducting property of sand is changed, and heat charging and heat release are completed in a shorter time, so that the distribution density of heat transfer fluid medium pipelines in a heat storage system (heat reservoir) of a closed container can be properly reduced, the pipeline resistance is reduced, the power is reduced, and the cost of a heat storage project is reduced; and because the carbon surface layer can be seriously oxidized at the temperature of more than 400 ℃, the container which is used for containing the sand stone with the carbon surface layer is required to have tightness, and inert nitrogen is filled in the space at the upper part of the heat accumulator for protection so as to prevent the carbon layer from being overheated and oxidized.
The method of the invention further has the technical proposal that: graphite paint is adopted to impregnate the sand stone, and after the paint is solidified, a carbon heat conduction layer with good heat conduction performance is formed on the sand stone surface layer.
The method of the invention further has the technical proposal that: the method comprises the steps of immersing sand and stone with diluted asphalt or diluted resin, heating the asphalt or resin to carbonize and attach the asphalt or resin on the surface layer of the sand and stone, and cooling the asphalt or resin to form a carbon heat conduction layer with good heat conduction performance on the surface layer of the sand and stone.
The method of the invention further has the technical proposal that: the sand stone adopts cobblestones with the granularity of 20-45 mm and medium fine sand.
The method of the invention further has the technical proposal that: the heat transfer fluid medium pipeline is a pipe rack type heat exchanger formed by connecting and combining a plurality of layers of pipelines.
The method of the invention further has the technical proposal that: the sand stone can be replaced by a heat accumulating brick made of magnesia carbon, magnesia iron and the like. The density of the heat storage bricks is larger than that of the sand stone, the specific heat is slightly larger than that of the sand stone, and the heat storage bricks are higher in cost, but compared with the heat storage devices with the same heat storage load, the heat storage bricks can reduce the volume of the heat storage devices to improve the heat storage density.
The sand and stone heat storage device with carbon heat conducting surface layer for realizing the method of the invention is provided with a heat preservation closed container filled with sand and stone, the side wall end of the closed container is provided with an inlet pipe orifice and an outlet pipe orifice, the sand and stone in the closed container is distributed with a pipe frame structure heat exchanger consisting of a plurality of layers of heat transfer fluid medium pipelines, the two ends of the heat exchanger are respectively communicated with the inlet pipe orifice and the outlet pipe orifice, the surface of the sand and stone is provided with the carbon heat conducting surface layer consisting of graphite paint, asphalt or resin, the gaps among the sand and stone are filled with graphite powder, the outside of the closed container is provided with a nitrogen cylinder (or a small nitrogen filling machine), and the outlet of the nitrogen cylinder (or the small nitrogen filling machine) is introduced into the closed container through a nitrogen pipe.
The device of the invention further has the technical proposal that: the sand stone adopts cobblestones with the granularity of 20-45 mm and medium fine sand.
The device of the invention further has the technical proposal that: a carbon heat conduction surface layer composed of graphite paint, diluted asphalt or diluted resin is prepared on the surface of the pipeline of heat transfer fluid medium.
The device of the invention further has the technical proposal that: the sand stone can also be replaced by a heat accumulating brick made of magnesia carbon, magnesia iron and the like.
Compared with the prior art, the invention has the following positive effects:
1. the invention adopts the sandstone with the carbon heat conduction surface layer, so that the heat transfer performance of the sandstone heat reservoir is greatly improved, and the distribution density of heat transfer pipelines in the heat reservoir and the power of a delivery pump are reduced;
2. the technical scheme of the invention can also be used as a high-temperature heat reservoir with the temperature of more than 500 ℃ for solar thermal power generation;
3. the invention uses the sand stone material as the heat storage material, and adopts a general steel structure which can be used as a container of the heat storage material;
4. the sandstone material adopted by the invention is cheap and easy to obtain, has low manufacturing cost, and can greatly reduce the heat storage engineering cost.
Drawings
FIG. 1 is a schematic diagram of a sand and gravel heat storage device with a carbon heat conducting surface layer.
Fig. 2 is a schematic structural view of a heat storage device of a heat storage brick structure.
The reference designations in the drawings are: 1-pipe inlet, 2-pipe outlet, 3-nitrogen cylinder (or small nitrogen charging machine), 4-nitrogen pipe, 5-valve, 6-heat transfer fluid medium pipeline, 7-sand stone, 8-pressure gauge, 9-heat preservation layer, 10-heat storage brick, 11-heat transfer pipeline, 12-graphite powder and 13-U-shaped groove.
Detailed Description
Referring to the attached drawings, the sand heat storage method of the invention comprises the following steps: the container of the closed container heat storage system is filled with a plurality of sandstones with carbon heat conduction surface layers, and the tubular frame type heat exchanger formed by connecting a plurality of layers of heat transfer fluid medium pipelines is distributed in the sandstones. In the concrete implementation, graphite paint is adopted to impregnate sand stone, and after the paint is solidified, a carbon heat conduction layer with good heat conduction performance is formed on the sand stone surface layer; or the diluted asphalt is adopted to soak the sand and then heated to enable the sand to be carbonized and attached to the sand surface layer, so that the sand surface layer forms a carbon heat conduction layer with good heat conduction performance. Or dilute resin is adopted to impregnate the sand and then heated to enable the sand to be carbonized and attached to the surface layer of the sand, so that a carbon heat conduction layer is formed on the surface of the sand; the heat charging and heat releasing can be completed in a short time, so that the distribution density of the fluid pipeline in the heat reservoir can be properly reduced, the pipeline resistance is reduced, the power is reduced, and the cost of the heat storage engineering is reduced. When the processed sand and stone is used for manufacturing the heat accumulator, a certain amount of graphite powder is added to fill fine gaps among the sand and stone, so that the heat accumulator is more compact. And filling inert nitrogen gas into the space at the upper part of the heat storage system of the closed container to prevent the carbon layer from being overheated and oxidized.
The structure of the sand and stone heat storage device with the carbon heat conduction surface layer is shown in figure 1. The heat-insulating device comprises a closed container (a heat accumulator) with a heat-insulating layer 9 arranged on the wall and a nitrogen cylinder (or a small nitrogen charging machine) 3 arranged outside the closed container, wherein an inlet pipe orifice 1 and an outlet pipe orifice 2 are formed at the side wall end of the container, a pipe frame structure heat exchanger consisting of a plurality of layers of multi-row heat-transfer fluid medium pipelines 6 is distributed in sand 7 in the closed container, two ends of the heat exchanger are respectively communicated with the inlet pipe orifice 1 and the outlet pipe orifice 2, each heat-transfer fluid medium pipeline 6 forming the pipe frame structure heat exchanger is distributed in sand 7 with a carbon heat-conducting surface layer, and graphite powder is filled in gaps among the sand; the outlet of the nitrogen bottle (or small-sized nitrogen filling machine) 3 is introduced into the closed container through a nitrogen pipe 4 provided with a valve 5 for filling inert nitrogen gas into the space of the closed container so as to prevent thermal oxidation. A pressure gauge 8 is also mounted on the upper part of the heat reservoir.
As an expansion of the technical scheme of the invention, the heat storage material in the heat storage device can also be a heat storage brick, and is generally a heat storage brick made of magnesia carbon, magnesia iron or other materials. The density of the heat storage bricks is larger than that of the sand stone, the specific heat is slightly larger than that of the sand stone, and the heat storage bricks are higher in cost, but compared with the heat storage devices with the same heat storage load, the heat storage bricks can reduce the volume of the heat storage devices to improve the heat storage density. The structure of the heat storage device with the heat storage brick structure is shown in fig. 2. In fig. 2, the heat storage brick 10 is provided with a U-shaped groove 13, and graphite powder 12 is filled in a gap between the U-shaped groove and the heat transfer pipeline 11 to enhance the heat transfer performance between the heat storage brick 10 and the heat transfer pipeline 11.
Claims (7)
1. A sand and stone heat storage method with a carbon heat conduction surface layer is characterized in that: the method comprises the steps of filling sand and stone in a heat storage system of a closed container, manufacturing carbon heat conduction surface layers on the surfaces of the sand and stone, filling graphite powder in gaps among the sand and stone, distributing heat transfer fluid medium pipelines filled with heat conduction oil or molten salt in the sand and stone with the carbon heat conduction surface layers, performing heat exchange between the heat transfer fluid medium pipelines and the sand and stone, completing heat filling and heat release, and filling inert nitrogen in a space at the upper part of the heat storage system of the closed container so as to prevent the carbon layer from being overheated and oxidized.
2. The method for storing sand and gravel with carbon heat conducting surface layer according to claim 1, wherein the method comprises the following steps: graphite paint is adopted to impregnate the sand stone, and after the paint is solidified, a carbon heat conduction layer with good heat conduction performance is formed on the sand stone surface layer.
3. The method for storing sand and gravel with carbon heat conducting surface layer according to claim 1, wherein the method comprises the following steps: the method comprises the steps of impregnating sand with diluted asphalt or diluted resin, heating the asphalt or resin to carbonize the asphalt or resin, and attaching the asphalt or resin on the surface layer of the sand, so as to form the carbon heat conducting layer with good heat conducting performance.
4. A method of sand and gravel heat storage with carbon heat conducting surface layer according to claim 1, 2 or 3, characterized in that: the sand stone adopts cobblestones with the granularity of 20-45 mm and medium fine sand.
5. The utility model provides a grit heat-retaining device that has carbon element heat conduction top layer which characterized in that: the heat-insulating airtight container is provided with an airtight container filled with sand stone (7), an inlet pipe orifice (1) and an outlet pipe orifice (2) are arranged at the side wall end of the airtight container, a pipe frame structure heat exchanger consisting of a plurality of layers of heat transfer fluid medium pipelines (6) is distributed in the sand stone (7) in the airtight container, two ends of the heat exchanger are respectively communicated with the inlet pipe orifice (1) and the outlet pipe orifice (2), a carbon heat conduction surface layer consisting of graphite paint, diluted asphalt or diluted resin is manufactured on the surface of the sand stone (7), graphite powder is filled in a gap between the sand stone, a small nitrogen filling machine is arranged outside the airtight container, and an outlet of the small nitrogen filling machine is introduced into the airtight container through a nitrogen pipe (4).
6. The sand and stone heat storage device with a carbon heat conducting surface layer according to claim 5, wherein: the sand stone (7) adopts cobblestones and medium fine sand with the granularity of 20-45 mm.
7. The sand and stone heat storage device with a carbon heat conducting surface layer according to claim 5, wherein: a carbon heat conduction surface layer composed of graphite paint, diluted asphalt or diluted resin is manufactured on the surface of the heat transfer fluid medium pipeline (6).
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| CN201710585597.4A CN107218832B (en) | 2017-07-18 | 2017-07-18 | Sand and stone heat storage method with carbon heat conduction surface layer and device thereof |
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| CN201710585597.4A CN107218832B (en) | 2017-07-18 | 2017-07-18 | Sand and stone heat storage method with carbon heat conduction surface layer and device thereof |
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| CN107218832B true CN107218832B (en) | 2023-06-27 |
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| CN108151566A (en) * | 2017-12-14 | 2018-06-12 | 西安中原机械有限公司 | Impregnate sandstone heat-storing method and its device |
| CN109028579A (en) * | 2018-07-17 | 2018-12-18 | 于可欣 | Boiler of organic heat carrier |
| CN108871029A (en) * | 2018-07-19 | 2018-11-23 | 西安中原机械有限公司 | Heat transfer medium overcurrent sandstone heat-storing method and its device |
| CN110369242A (en) * | 2019-07-26 | 2019-10-25 | 马鞍山钢铁股份有限公司 | A kind of manufacturing process of anti-oxidation scaling loss substrate and anti-oxidation scaling loss steel billet product |
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