Agricultural heat complementary vacuum heat collection system

Abstract

The utility model provides an agricultural heat complementary vacuum heat collection system. Solar two-way vacuum heat collection pipes which are arranged in a line and communicated end to end are installed in the same direction as a bearing cable, and therefore a vacuum pipe heat collection suspension cable is formed. And the vacuum tube heat collection suspension cable is suspended above the cultivated land. The system is super large in span and few in pile foundation, operation of a large agricultural machine is not hindered, intermittent shadows do not affect photosynthesis and can stimulate crop yield increase, cultivated land can be normally cultivated, and irrigation, light supplementing and rat repelling can be achieved. According to the invention, a broad new land where solar heat collection is not affected by cultivated land planting is developed, and a new technical solution is provided for guaranteeing the safety of energy and grains.

Description

Technical Field

[0001] This application belongs to the technical fields of solar vacuum tube heat collection and ecological agriculture, specifically relating to an agricultural-thermal complementary vacuum heat collection system. Background Technology

[0002] The applicant's patent, "Off-grid Solar Thermal Curing Method for Tobacco (CN117547055A)," discloses a solar-powered tobacco curing system and method. It includes a curing oven, a solar collector or solar photovoltaic power generation system, a thermal storage container and storage medium, an electrically controlled valve, a liquid pump or heat transfer pipe, a temperature sensor, and a controller. It eliminates the need to extend the power grid to remote mountain fields and the need to convert solar energy into electricity for storage. It can directly or indirectly utilize solar thermal energy for the day and night curing of tobacco leaves and other materials. It eliminates the step of first converting solar energy into electricity for storage and then converting the electricity into heat for use, relying entirely on solar energy (as a clean energy source) to heat and cure tobacco leaves and other materials. This technology makes tobacco curing production more energy-efficient and environmentally friendly, and is expected to reduce curing costs.

[0003] However, recent practical experience at a tobacco planting base in Honghe Prefecture, Yunnan Province, revealed the following problem: the solar vacuum collector array requires a large area of ​​farmland. Constructing a standard tobacco curing yard with 100 curing barns requires 25 mu (approximately 4.3 hectares) of arable land just for the solar vacuum collector array. This significant land requirement has caused considerable obstacles for the project. Summary of the Invention

[0004] The purpose of this application is to provide an agricultural-thermal complementary vacuum heat collection system that aims to stimulate crop yields without occupying arable land, thereby improving the efficiency of arable land use and promoting the development of renewable energy and ecological agriculture.

[0005] This application provides an agricultural-thermal complementary vacuum heat collection system, which includes:

[0006] ① The load-bearing cable and the solar double-pass vacuum collector tubes installed in the same direction on the load-bearing cable; among them, numerous solar double-pass vacuum collector tubes are arranged in a row and connected end to end to form a vacuum tube collector suspension cable.

[0007] ② A tall support structure erected on the ground and numerous vacuum tube heat collection suspension cables suspended above it, spaced at certain intervals over the cultivated land; the height of each vacuum tube heat collection suspension cable above the top of the crop is H, the span of each cable is L, and the horizontal projection spacing of each cable is K; wherein, H ≥ 1m, 2m, 5m, 10m, 20m, 30m, 50m, or 100m, L ≥ 10m, 20m, 50m, 100m, 200m, or 500m, K ≥ 0.2m, 0.5m, 1m, 2m, 5m, or 10m, and the ratio of the horizontal projection width D of the vacuum tube heat collection suspension cable to the horizontal projection spacing K—the shading coefficient: D / K ≤ 0.01 or 0.02 or 0.03 or 0.05 or 0.10 or 0.20 or 0.30 or 0.50 or 1, (the height-to-interval ratio K / H ≤ 0.1 or 0.5 or 1 or 2, so that the shadow moves quickly and avoids the same midday shadow passing over the same crop for more than 30 minutes); the crops need sunlight, so it is best to shade them for 3-5 minutes every 20 minutes, (in this way) continuously shading and releasing, shading and releasing again to provide intermittent light to stimulate crop growth and increase crop yield.

[0008] Preferably, the agricultural-thermal complementary vacuum heat collection system is characterized in that: the solar dual-channel vacuum heat collection tubes are connected by insulated pipe joints, the air inside the tubes is the heat transfer medium, and hot air can be transported from one end of the vacuum tube heat collection suspension to the other end; or, a heat transfer oil / water pipe passes through the solar dual-channel vacuum heat collection tubes, the heat transfer oil / water is the heat transfer medium, and the heat transfer oil / water can be transported from one end of the vacuum tube heat collection suspension to the other end.

[0009] Preferably, the agricultural-thermal complementary vacuum heat collection system is characterized in that: the vacuum tube heat collection suspension cable is also used as an irrigation water pipe; and water outlet holes (such as drip holes or spray holes) are opened on the heat-insulated pipe joint for supplying water to the farmland for irrigation.

[0010] Preferably, the agricultural-thermal complementary vacuum heat collection system includes any one or more of the following technical features:

[0011] ① An irrigation water pipe is attached to the vacuum tube heat collection suspension cable to integrate the vacuum tube heat collection suspension cable and the water supply irrigation water pipe into one, so that they can share the same load-bearing cable and its tall support structure.

[0012] ②A loudspeaker is installed on the vacuum tube heat collection suspension cable to play sounds to scare away birds and rodents or to play music that crops like to promote crop growth;

[0013] ③Supplemental light lamps are installed on the vacuum tube heat collection suspension cable to provide supplemental light to light-loving crops at night, so as to promote crop growth;

[0014] ④L is 10-320m, D / K≤0.25, H≥1m;

[0015] ⑤ The vacuum tube heat collector suspension cable is suspended along a north-south direction;

[0016] ⑥ The solar dual-channel vacuum collector tube is suspended below the load-bearing cable and is set in the same direction as the load-bearing cable;

[0017] ⑦ The height H of the vacuum tube heat collection suspension cable from the top of the crop is high enough, the shading coefficient D / K is small enough, and the height-to-spacing ratio K / H is ≤0.1, 0.5, 1, or 2, so that the shadow moves quickly and avoids the same midday shadow passing over the same crop for more than 30 minutes.

[0018] Studies show that when selecting the shading factor, the principle should be to ensure that the midday shadow cast by the vacuum tube solar collector suspension on the farmland can be quickly moved away from the crops: each midday shadow should be moved by the width of one midday shadow every 1-20 minutes (ideally every 1-5 minutes) to avoid the same shadow remaining on the same crop for too long (e.g., more than 30 minutes), which would weaken the crop's photosynthesis and reduce yield. To standardize the measurement, the midday shadow is defined here as the shadow cast by the sun on the ground by the vacuum tube solar collector suspension at midday (i.e., from 11:00 to 13:00).

[0019] Studies show that when the shading coefficient D / K ≤ 0.25, crops are shaded for 3-5 minutes every 20 minutes. With this continuous shading and unshaking, the average amount of sunlight received by the crops will decrease by 13-20% each time. A 13% reduction in sunlight exposure has no impact on crop photosynthesis or yield; a 20% reduction begins to have some effect on photosynthesis and yield. Therefore, in practice, it is not recommended to reduce sunlight exposure by more than 20%.

[0020] Studies show that the duration of a shadow on the same crop is inversely proportional to height (H) and directly proportional to depth (D). Taking Xiuying District of Haikou City as an example, for a north-south oriented vacuum tube solar collector suspension cable (H = 50 meters high), the shadow's movement speed at noon (11:00 AM) on March 4th was 68 cm / minute. If the height (H) of the suspension cable was reduced to 4.6 meters, the shadow's movement speed would decrease to 2.5 cm / minute; if it was reduced to 1.2 meters, the speed would decrease to 0.6 cm / minute. Furthermore, if the height (H) was reduced to 5 meters at noon (1:30 PM) on March 4th, the shadow's movement speed would decrease to 1.3 cm / minute. Comparative observations show that the shadow movement speed of an east-west oriented vacuum tube solar collector suspension cable is very slow, moving only a little over 1 meter in a whole day. In practice, east-west oriented vacuum tube solar collector suspension cables should be avoided as much as possible. Therefore, to mitigate the impact of slow shadow movement on crop growth, the suspension height (H) of the vacuum tube heat collection cable should be increased as much as possible. Given that a height H of 1 meter results in a long shadow time on the crop, severely affecting crop growth, such a low height H is not recommended.

[0021] In summary, in practical implementation, the height H should preferably be 2m or more, and preferably 4m or more; the horizontal projection spacing K should preferably be 0.5m or more, and preferably 1m or more, with D / K ≤ 0.25.

[0022] In practice, the shading coefficient D / K should be selected according to the type of crop in the cultivated land. For crops that require shading nets to regulate light levels, and for green and lush land where yield is not a concern, such as vegetable crops like lettuce, spinach, cabbage, mustard greens, celery, forest crops, and grassland crops, the shading coefficient D / K can be appropriately increased, and the spacing of the vacuum tube heat collection suspension cables can be reduced.

[0023] A certain AI model defines arable land as farmland, woodland, mountains, and grasslands. Arable land refers to land used for agricultural production, including farmland for growing crops, grassland for livestock, woodland for planting and harvesting timber, and mountains for animal husbandry and pastures. In this application, arable land broadly refers to any ground suitable for the growth of green vegetation, including but not limited to woodland, grassland, farmland, green slopes, gullies, orchards, and green hills and clear waters, including ditches, canals, roads, and embankments within arable land. It also includes green belts along roadsides and along their sides.

[0024] Compared with the prior art, this application has the following beneficial technical effects.

[0025] Firstly, it does not occupy arable land: apart from the small amount of land occupied by the pile foundation, it does not occupy arable land. Therefore, it can improve the efficiency of arable land use and promote the development of renewable energy.

[0026] Secondly, the span is large: the vacuum tube solar collector suspension cable of this application connects the double-pass solar collector tubes in a single line, which can greatly increase the span, without occupying arable land, basically without hindering large-scale mechanized agricultural production, and will not cause any ecological and environmental impact on the original crops on arable land.

[0027] Thirdly, solar heat collection and irrigation are combined into one: This application adds an irrigation water pipe to the vacuum tube solar collector suspension cable, which cleverly and organically combines solar heat collection and water supply irrigation. The load-bearing cable and tall support structure are shared, which can be invested and constructed at one time, and the overall cost is greatly reduced.

[0028] Fourth, the three functions of heat collection, irrigation and supplementary lighting are combined into one: This application adds supplementary lighting lamps to the vacuum tube heat collection suspension cable, which organically combines heat collection, water supply and irrigation and the installation of supplementary lighting lamps. The load-bearing cable and tall support structure are used together, which can be invested and constructed at one time, and the overall cost is greatly reduced.

[0029] Fifth, dual use of land for agriculture and solar energy complementarity: The most significant technological benefit of this application is the ingenious development and utilization of surplus solar energy resources above arable land. This not only avoids occupying arable land and affecting agricultural and forestry production, but also increases the output value of arable land. It can improve the single agricultural and forestry use of land, enhance land value, alleviate the shortage of land for solar thermal collection, and promote the innovative development of complementary agriculture, forestry, and clean energy.

[0030] Sixth, intermittent lighting increases yield and income: By reducing the height-to-spacing ratio (K / H) and the shading coefficient (D / K), and by suspending the vacuum tube heat collection suspension cable in a north-south direction, the shadow can quickly move away from the crops. Experiments conducted by the inventors on vegetables and tobacco show that by periodically shading the crops for short periods, such as 1-5 minutes every 20-30 minutes, and repeating this cycle of shading and releasing sunlight, the shadow of the vacuum tube heat collection suspension cable is rapidly shaded and released multiple times daily. This allows crops under the vacuum tube heat collection suspension cable to receive intermittent lighting frequently and for extended periods, essentially meeting their growth needs for continuous sunlight throughout the day. Experimental data shows that this intermittent lighting method not only does not affect photosynthesis but also increases the yield of vegetables, tobacco, and other crops, truly achieving a win-win situation for agriculture and sunlight. This discovery, however, is an unexpected technological gain. The principle behind its yield-increasing effect through intermittent lighting is still unclear, and which other crops will also benefit from this technology requires further testing and verification in practice. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the application of the agricultural-thermal complementary vacuum heat collection system of this application (Example 1) on a piece of farmland (section 1).

[0032] Figure 2 for Figure 1A schematic diagram of the horizontal projection cross-section of the seven vacuum tube heat collection suspension cables on the farmland.

[0033] Figure 3 for Figure 1 A schematic diagram of the structure of a section (internal tube connector) of the vacuum tube heat collection suspension cable.

[0034] Figure 4 This is a schematic diagram of a vacuum tube heat collection suspension structure (external insertion tube connector) according to this application.

[0035] Figure 5 This is a schematic diagram of a section of a vacuum tube heat collection suspension structure with an irrigation water pipe attached, as described in Embodiment 2 of this application.

[0036] Figure 6 This is a schematic diagram of a section of the vacuum tube heat collection suspension structure (drip irrigation) in this application (Example 2).

[0037] Figure 7 This is a schematic diagram of a section of a vacuum tube heat collection suspension structure with a supplementary light in this application (Embodiment 3).

[0038] Figure 8 This is a schematic diagram of a section of a vacuum tube heat collection suspension structure with a horn attached, as described in Embodiment 4 of this application.

[0039] Explanation of the reference numerals: 1-Vacuum tube heat collection suspension cable, 2-Bearing cable, 3-Solar double-pass vacuum heat collection tube, 4-Insulated pipe joint, 5-Suspension component, 6-Tall support, 601-Support beam, 7-Crop, 8-Farmland, 9-Shade, 10-Drip nozzle, 11-Sunlight, 12-Water pipe, 13-Water droplet, 14-Spraying water, 15-Supplemental light, 16-Speaker, 17-Large agricultural machinery, 18-Power supply wire, 19-Hot air. Detailed Implementation

[0040] To make the technical means, creative features, objectives and effects of this application easier to understand, the following describes this application in conjunction with specific implementation methods.

[0041] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. It should also be noted that, for ease of description, this application defines the length direction of the vacuum tube heat collection suspension cable as longitudinal, and the direction perpendicular to it as transverse.

[0042] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "communication" should be interpreted broadly. For example, "series connection" can refer to both air connection and direct connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Example 1

[0043] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, according to the needs of a tobacco curing yard with 100 curing barns in the background technology, thousands of vacuum tube heat collection suspension cables 1, 15 meters above the ground and spaced 1 meter apart, are erected in the air above the cultivated land 8 near the tobacco curing yard in a north-south direction.

[0044] The first step is to suspend the load-bearing cable 2 (preferably with a high tensile strength greater than 1200 MPa) above the farmland 8 through a tall support structure 6 (similar to a power line tower / pole) with a support column or cable tower higher than 15 meters, just like erecting a high-voltage power transmission line, with an interval of 1 meter between them.

[0045] To reduce the number of piles, the lateral spacing between piles can be appropriately increased to save land area. For this reason, the support beam 601 in the tall support 6 may not be a rigid beam, but a flexible beam, such as a very thick steel cable (not shown in the figure).

[0046] The aforementioned load-bearing cable 2 can be made of galvanized prestressed steel strands with a diameter of φ15.2×3, high-strength fiber ropes, carbon fiber cables, aramid cables, glass fiber cables, steel wire ropes, lightweight pipes, etc.

[0047] The second step is to procure a batch of 2-meter-long, double-pass vacuum solar collector tubes 3 with an outer diameter of φ70 and an inner diameter of φ60. The double-pass vacuum solar collector tube 3 is a commercially available, mature product; its specific technology will not be detailed here, but can be found in utility model patents such as "A Double-Pass Solar Vacuum Tube with a Gourd-Shaped Knot (CN211716906U)" and "A Double-Pass Solar Vacuum Tube with an Expansion Knot (CN203880985U)".

[0048] The third step is to procure a batch of insulated pipe fittings 4 and their sealing rings (not shown in the figure). Insulated pipe fittings 4 can be either internal insertion type fittings (such as...) Figure 3 (As shown) External insertion pipe fittings (such as) can also be used. Figure 4 (As shown in the diagram). Prepare some more wire to make suspension component 5.

[0049] The fourth step is to arrange the solar double-pass vacuum heat collection tubes 3 in a line along the length of the load-bearing cable 2 (preferably along the north-south direction), and connect them end to end with the heat-insulating pipe joints 4 and their sealing rings to form a vacuum tube heat collection suspension cable 1 that is tens or even hundreds of meters long.

[0050] It should be noted that the height H of the vacuum tube heat collection suspension 1 from the top of the crop, the span L of the vacuum tube heat collection suspension, and the horizontal projection spacing K of the vacuum tube heat collection suspension should be set according to the height of the crop 7. Ideally, H ≥ 1m or 2m or 5m or 10m or 20m or 30m or 50m or 100m, L ≥ 10m or 20m or 50m or 100m or 200m or 500m, and K ≥ 0.2m or 0.5m or 1m or 2m or 5m should be set according to local conditions.

[0051] It should also be noted that the spacing of the vacuum tube heat collection suspension cable 1 should be set according to the needs of the crop, so that the ratio of the width D of the horizontal projection 9 of the vacuum tube heat collection suspension cable 1 to the spacing K of the horizontal projection 9 is the shading coefficient: D / K≤0.01 or 0.02 or 0.03 or 0.05 or 0.1 or 0.2 or 0.3 or 0.5 or 1.

[0052] Finally, as needed, an insulated gas transmission pipe can be installed according to the gas transmission requirements of the existing solar vacuum tube collector system, and the hot air 19 can be transported to the tobacco curing plant through the insulated gas transmission pipe (not shown in the figure).

[0053] Alternatively, instead of using air inside the pipe as a heat transfer medium, heat transfer oil can be used. For example, a heat transfer oil pipe (not shown in the figure) can be passed through the solar double-pass vacuum collector tube 3, and hot oil can be transported from one end of the vacuum tube collector suspension 1 to the other end, so that the heat can be transferred to the tobacco curing field by the heat transfer oil. Example 2

[0054] like Figure 5 As shown, referring to the steps in the above embodiments, an irrigation water pipe 12 can be attached to the vacuum tube heat collection suspension 1 to integrate the vacuum tube heat collection suspension 1 and the irrigation water pipe 12 into one unit, sharing a common load-bearing cable 2 and its tall support 6. In this way, depending on the drought situation, the solar thermal system of this application can also be used to spray water to irrigate the crops 7.

[0055] like Figure 6 As shown, a drip nozzle 10 can also be connected to each insulation pipe joint 4. The drip nozzle 10 is a device used in drip irrigation systems. It can control the water flow and release water slowly to the roots of plants in a dripping manner. This will not be elaborated here. In this way, the crop 7 can be irrigated by dripping water through the solar dual-channel vacuum heat collection pipe 3 at night, thus realizing two uses for one pipe, which can collect solar energy and deliver water for irrigation. Example 3

[0056] like Figure 7 As shown, referring to the steps in the above embodiments, a power supply wire 18 and a supplementary light lamp 15 can be attached to the vacuum tube heat collection suspension cable 1 to integrate the vacuum tube heat collection suspension cable 1 with the supplementary lighting circuit and the supplementary light lamp 15 (commonly known as a plant growth lamp), sharing a common load-bearing cable 2 and its tall support 6. In this way, according to the needs of the crop 7, the solar thermal system of this application can also be used to provide supplementary lighting for the crop 7 at night to promote the growth of the crop 7. Example 4

[0057] like Figure 8 As shown, referring to the steps in the above embodiments, a power supply wire 18 and a speaker 16 can be attached to the vacuum tube heat collection suspension 1 to integrate the vacuum tube heat collection suspension 1 with the broadcast circuit and speaker 16, sharing a common load-bearing cable 2 and its tall support 6. In this way, according to the needs of the crop 7, music can be played for the crop 7 using the solar thermal system of this application to promote crop growth. Of course, bird and rodent deterrent sounds can also be played to protect the fruit of the crop 7.

[0058] The above-disclosed embodiments are merely preferred embodiments of this application. The accompanying drawings are only schematic diagrams and are not drawn to scale. They cannot be used to limit the scope of this application. Equivalent variations made based on the claims of this application still fall within the scope of this application.

Claims

1. An agri-vacuum thermal complementary system, characterized in that, It comprises: ① load-bearing cables and solar double-pass vacuum heat-collecting tubes installed on the load-bearing cables in the same direction; a plurality of the solar double-pass vacuum heat-collecting tubes are arranged in a line and connected at the ends to form a vacuum-tube heat-collecting suspension cable; ② high supports erected on the ground and a plurality of vacuum-tube heat-collecting suspension cables suspended therefrom and located above the farmland at intervals; the height of the vacuum-tube heat-collecting suspension cable from the top of the crops is H, the span of the vacuum-tube heat-collecting suspension cable is L, and the horizontal projection interval of the vacuum-tube heat-collecting suspension cable is K; wherein H≥1m or 2m or 5m or 10m or 20m or 30m or 50m or 100m, L≥10m or 20m or 50m or 100m or 200m or 500m, K≥0.2m or 0.5 or 1m or 2m or 5m or 10m, and the ratio of the horizontal projection width D of the vacuum-tube heat-collecting suspension cable to the horizontal projection interval K, i.e. the shading coefficient: D / K≤0.01 or 0.02 or 0.03 or 0.05 or 0.10 or 0.20 or 0.30 or 0.50 or 1.

2. The agri-vac hybrid solar thermal system of claim 1, wherein: The air in the solar double-pass vacuum heat-collecting tubes is the heat transfer medium, and the hot air can be transported from one end of the vacuum-tube heat-collecting suspension cable to the other end; or a heat-conducting oil / water pipe passes through the solar double-pass vacuum heat-collecting tubes, and the heat-conducting oil / water is the heat transfer medium, which can be transported from one end of the vacuum-tube heat-collecting suspension cable to the other end.

3. The solar-thermal hybrid vacuum thermal collector system of claim 1, wherein: The vacuum-tube heat-collecting suspension cable is used as an irrigation water pipe; water outlets are formed on the heat-preservation pipe joints to supply water for irrigation of the farmland.

4. The agricultural heat-complementary vacuum heat-collecting system according to claim 1 or 2 or 3, characterized in that: a water pipe for irrigation is attached to the vacuum-tube heat-collecting suspension cable to integrate the vacuum-tube heat-collecting suspension cable and the water pipe for irrigation into one, so that the same load-bearing cable and high support are shared; or a loudspeaker is installed on the vacuum-tube heat-collecting suspension cable to play sound to drive away birds and mice or play music that crops like to promote the growth of crops; or a light-supplementing electric lamp is arranged on the vacuum-tube heat-collecting suspension cable to supplement light for light-loving crops at night to promote the growth of crops; or L is 10-320m, D / K≤0.25, and H≥1m; or the vacuum-tube heat-collecting suspension cable is suspended along the north-south direction; or the solar double-pass vacuum heat-collecting tubes are suspended below the load-bearing cables and arranged in the same direction as the load-bearing cables; or the height H of the vacuum-tube heat-collecting suspension cable from the top of the crops is high enough, the shading coefficient D / K is small enough, and the interval-height ratio K / H≤0.1 or 0.5 or 1 or 2, so that the shadow moves quickly and the same midday shadow does not move across the same crop for more than 30 minutes.

Images