Plug-in agricultural solid hydrogen supply equipment and continuous hydrogen supply method

Abstract

The invention relates to plug-in agricultural solid hydrogen supply equipment and a continuous hydrogen supply method, the plug-in agricultural solid hydrogen supply equipment comprises a hydrogen supply container and a solid hydrogen storage material, the hydrogen supply container comprises a containing cavity, a liquid inlet and an exhaust hole, the liquid inlet and the exhaust hole are communicated with the containing cavity, and the solid hydrogen storage material is contained in the containing cavity of the hydrogen supply container; the hydrogen supply container is inserted into the agricultural substrate, liquid and the solid hydrogen storage material in the containing cavity are controlled to react to release hydrogen by regulating and controlling liquid inlet parameters of the liquid inlet, and hydrogen overflows to the agricultural substrate from the exhaust hole; the solid hydrogen storage material comprises at least one of magnesium hydride, calcium hydride, potassium hydride, ammonia borane, potassium borohydride, magnesium borohydride and calcium borohydride. By adjusting the liquid inlet parameters of the liquid inlet, such as liquid inlet material composition, liquid inlet amount, liquid inlet speed, liquid inlet pH value and the like, the process of supplying hydrogen to the agricultural substrate is simply and conveniently controlled, and the problems that hydrogen supply is not uniform, unstable, difficult to continue and the like are solved.

Description

Technical Field

[0001] This invention relates to the field of hydrogen agriculture, and in particular to an insertable solid hydrogen supply device for agriculture and a method for continuous hydrogen supply. Background Technology

[0002] Hydrogen agriculture, as an emerging development direction in modern agriculture, provides hydrogen to the plant growth environment to exert its biological activity effects, and has become an important research direction for promoting agricultural quality and efficiency. Studies have shown that hydrogen has multiple biological functions, including antioxidation, regulation of plant signal transduction, and enhancement of enzyme activity. It can effectively promote plant growth and development, improve stress resistance, and enhance crop quality, demonstrating significant application value in the cultivation of various crops such as food crops, cash crops, and fruits and vegetables. With the continuous deepening of hydrogen agriculture research, achieving a precise and stable supply of hydrogen has become crucial to fully realizing the effects of hydrogen agriculture and promoting its large-scale application.

[0003] Currently, hydrogen supply technologies in the hydrogen agriculture field mainly rely on the following technical paths: First, hydrogen is dissolved in irrigation water through electrolysis, chemical methods, fermentation, or directly from high-pressure cylinders to form a hydrogen-rich water irrigation system, either on-site or pre-prepared. This system then irrigates agricultural substrates or sprays it directly onto plant surfaces. For example, utility model patent CN219663680U provides a novel hydrogen-rich water plant nutrient solution preparation system. This system includes a hydrogen-rich water generator connected to a first delivery pump via a pipeline. The first delivery pump is connected to a mother liquor preparation tank via a first delivery pipeline. The first delivery pump is connected to a nutrient solution preparation tank via a second delivery pipeline. The nutrient solution preparation tank is connected to the mother liquor preparation tank via a third delivery pipeline, and a second delivery pump is installed on the third delivery pipeline. This utility model uses a hydrogen-rich water generator or directly mixes hydrogen-rich water with concentrated mother liquor. For example, invention patent CN102657221B discloses a hydrogen-rich liquid plant growth regulator, wherein the hydrogen saturation in the solvent is 0.1-100%, and the solvent is water or a 25-100% strength Hoagland nutrient solution, Kimura B nutrient solution, TAP nutrient solution, or MS culture medium. This invention first prepares hydrogen gas, then introduces the hydrogen gas into the solvent for more than 30 minutes, further diluting it to obtain the hydrogen-rich liquid plant growth regulator with a saturation of 0.1-100%. The hydrogen gas is prepared by water electrolysis, chemical methods, fermentation, or released from a hydrogen cylinder. Because hydrogen is easily dispersed, the hydrogen solubility in the above-mentioned technologies is difficult to maintain a constant or be effectively adjusted as needed, making it difficult to meet the demand for stable hydrogen release during plant growth. The above-mentioned hydrogen supply process has high energy consumption and cost, making it difficult to apply on a large scale. The second method is to directly apply solid hydrogen storage materials to agricultural substrates, releasing hydrogen through the reaction between the material and the water in the substrate. For example, the invention patent application CN119797985A discloses a soilless cultivation nutrient solution containing solid hydrogen supply materials and an irrigation method and system. The raw materials of the soilless cultivation nutrient solution include solid hydrogen supply materials, nutrient solution and pH adjuster; the amount of solid hydrogen supply materials is 0.05-5 mmol / L; the amount of pH adjuster is 0.01-50 mmol; the raw materials are mixed to provide a soilless cultivation nutrient solution with an irrigation hydrogen concentration ≥500 ppb / L and a pH value of 5-8. This method can provide hydrogen-rich nutrient solution to soilless plants in a controlled manner, achieving stable hydrogen release and appropriate adjustment of pH and nutrient composition to meet the needs of different crops and different growth stages. However, the irrigation system equipment is relatively complex, and the laying and maintenance of irrigation pipelines are not conducive to large-scale promotion.

[0004] While the aforementioned existing technologies have enabled the application of hydrogen in agriculture to some extent, they still face numerous insurmountable limitations: hydrogen supply equipment is complex in structure, occupies a large space, and lacks flexibility in use; electrolysis methods are energy-intensive, and high-pressure hydrogen storage and aeration dissolution methods suffer from rapid hydrogen dissipation and difficulty in maintaining solubility, leading to unstable hydrogen supply; while solutions based on solid-state hydrogen storage materials require precise control of reactant ratios and pH values, and the equipment is also relatively complex. Therefore, existing hydrogen supply technologies for agriculture generally face common bottlenecks such as uneven hydrogen supply, difficulty in concentration control, high energy consumption, high system complexity, and high operating costs, severely restricting the full realization and large-scale promotion of the effects of hydrogen agriculture.

[0005] In response to this current technological situation, there is an urgent need in this field to develop a new type of hydrogen supply equipment and method that is stable in hydrogen supply, easy to use, adaptable to agricultural substrate environments, and suitable for large-scale production, in order to overcome the current technical difficulties and promote the mature and large-scale industrial application of hydrogen agriculture. Summary of the Invention

[0006] To address the numerous problems in hydrogen supply technology and large-scale production in existing hydrogen agriculture, this invention provides an insertable agricultural solid hydrogen supply device and a continuous hydrogen supply method. By adjusting the liquid inlet parameters of the hydrogen supply container, the liquid and solid hydrogen storage material react in a controlled manner to release hydrogen. The device has a simple structure and is easy to operate. It achieves precise, continuous, and stable hydrogen supply to agricultural substrates without the need for large-scale replacement of existing agricultural equipment, making it suitable for large-scale agricultural production.

[0007] In a first aspect of the invention, an insertable agricultural solid hydrogen supply device is provided, comprising a hydrogen supply container and a solid hydrogen storage material: The hydrogen supply container includes a receiving cavity, as well as an inlet and an outlet communicating with the receiving cavity, and solid hydrogen storage material is housed in the receiving cavity of the hydrogen supply container. The hydrogen supply container is inserted into the agricultural substrate. By adjusting the liquid inlet parameters, the liquid reacts with the solid hydrogen storage material in the container cavity in a controlled manner to release hydrogen. The hydrogen gas overflows from the exhaust port into the agricultural substrate. The solid hydrogen storage material includes at least one of magnesium hydride, calcium hydride, potassium hydride, ammonia borane, potassium borohydride, magnesium borohydride, and calcium borohydride.

[0008] By utilizing the independent reaction space provided by the hydrogen supply container and its adjustable liquid inlet parameters, precise hydrogen control can be achieved in the reaction between liquid and solid hydrogen storage materials. This avoids the hydrogen supply runaway problem caused by the variable substrate environment in existing technologies, ensuring stable hydrogen concentration to match plant needs and solving the problems of fluctuating and uneven hydrogen supply. Secondly, the hydrogen supply container in this invention is inserted into the agricultural substrate and uses a vent hole for directional hydrogen overflow, allowing hydrogen to directly act on the crop root zone, reducing transmission and loss. Compared with high-pressure hydrogen supply and hydrogen-rich water irrigation, this improves hydrogen utilization and reduces hydrogen waste. Furthermore, this invention uses hydrogen... Solid-state hydrogen storage materials such as magnesium oxide offer a simple device structure while avoiding the high energy consumption and high cost issues associated with electrolysis and high-pressure hydrogen supply. This aligns with the economic needs of agricultural production. The invention allows for the start / stop and rate adjustment of hydrogen supply by controlling the inlet parameters, simplifying operation and overcoming the drawbacks of cumbersome operation and poor safety in existing technologies. Furthermore, the solid-state hydrogen storage material selected in this invention reacts mildly with agricultural liquids, and the reaction is completed within the containment chamber without adverse effects on the substrate. This makes it suitable for various scenarios such as soil and hydroponic substrates. The plug-in installation allows for flexible matching of crop density and farmland size, thus helping to solve the problem of narrow application scenarios in existing technologies.

[0009] Among them, solid hydrogen storage materials can be used in a compounding manner. In addition to controllable hydrogen supply, they can also form salts containing trace elements through reaction or the addition of acid to meet the needs of crop growth.

[0010] Optionally, the solid hydrogen storage material includes a mixture of magnesium hydride, potassium borohydride, and nano-silica. Adjusting the ratio of magnesium hydride and potassium borohydride can regulate the hydrogen supply quantity and rate, while nano-silica prevents the composite hydrogen storage material from clumping through physical dispersion, further improving the uniformity of contact between the liquid and solid hydrogen storage material. Compared to using a single solid hydrogen storage material, this composite hydrogen storage material is beneficial for improving the utilization rate of solid hydrogen storage materials and extending the hydrogen supply cycle.

[0011] Preferably, the hydrogen supply container has a cylindrical structure, with the liquid inlet located at one end of the cylindrical structure opposite to the insertion direction.

[0012] Compared to non-cylindrical structures, cylindrical structures, especially those with smooth circumferences, reduce resistance when inserted into agricultural substrates. This facilitates control over insertion depth and direction, ensuring that the venting holes act on the root zone, thereby improving the efficiency of directional hydrogen delivery and reducing hydrogen loss due to container misalignment. This, in conjunction with the aforementioned solutions, enhances hydrogen utilization. The liquid inlet is located at the end opposite to the insertion direction, allowing the liquid inlet operation to be completed outside the agricultural substrate without contacting the container body inside. This avoids disturbing the substrate structure, damaging plant roots, or introducing impurities that contaminate the substrate during operation.

[0013] Preferably, a support cage is provided between the hydrogen supply container and the agricultural substrate, and the hydrogen supply container is detachably inserted into the support cage, with each vent hole extending horizontally or downward through the container wall.

[0014] The pre-set support cage prevents the hydrogen supply container from being deformed by the agricultural substrate during insertion or use, ensuring the integrity of the closed reaction space and ensuring that the control of the liquid inlet parameters can achieve the expected intervention effect on the reaction. At the same time, the detachable design facilitates the replacement, maintenance, or replenishment of solid hydrogen storage material in the hydrogen supply container, reducing equipment operation and maintenance costs and adapting to the needs of large-scale agricultural use. The horizontal or downward extension of the vent hole can effectively guide the hydrogen to diffuse slowly and directionally towards the root distribution area, compared to upward or non-directional settings, avoiding the rapid upward dissipation and loss of low-density hydrogen. This synergistic effect of directional hydrogen overflow further improves hydrogen utilization. Meanwhile, the horizontal or downward venting direction can prevent substrate particles or liquids from entering the vent hole and causing blockage or uncontrolled hydrogen supply, ensuring a smooth and stable hydrogen output channel.

[0015] Optionally, the support cage is woven from galvanized steel wire, with multiple reinforcing ribs along the axial direction on the inner wall. The galvanized steel wire enhances the cage's resistance to substrate corrosion, extending its service life and meeting the needs of long-term agricultural use. The reinforcing ribs maintain the overall shape of the support cage, reducing contact wear between the hydrogen supply container and the support cage, and ensuring the integrity of the closed reaction space of the hydrogen supply container. Alternatively, the support cage can be made of other materials such as porous resin injection molded parts, as long as it stably supports the space for inserting the hydrogen supply container within the agricultural substrate.

[0016] Preferably, the cavity is filled with a loading material, and a solid hydrogen storage material is attached to the loading material; The load material includes at least one of porous metal materials, porous inorganic materials, and porous polymer materials.

[0017] The high specific surface area of ​​the porous loading material allows the solid hydrogen storage material to be uniformly dispersed and attached, preventing the hydrogen storage material from clumping and causing uneven liquid contact. This ensures that the reaction proceeds smoothly within the containment cavity, reducing hydrogen supply fluctuations caused by localized violent or insufficient reactions, and synergizing with the precise hydrogen control effect of the aforementioned scheme. At the same time, the loading material can fix the position of the solid hydrogen storage material, preventing the hydrogen storage material from piling up when the hydrogen supply container is tilted, and ensuring the stability of the reaction interface. In addition, the porous structure can adsorb some of the reaction liquid and release it slowly to maintain a stable reaction rate, avoiding excessively high hydrogen supply peaks caused by a single liquid injection, and further adapting to the plant's stable hydrogen concentration requirements.

[0018] Preferably, the load material includes at least one of porous magnesium material, porous carbon material, porous silicon material, and porous polymer material; Within the containment cavity, the solid hydrogen storage material adheres to the load material in at least one of the following ways: 1) After filling the containment cavity with the loading material, the solid hydrogen storage material is drawn into the containment cavity and attached to the loading material by using negative pressure; 2) Mix the solid hydrogen storage material with the load material, or use negative pressure to adsorb the solid hydrogen storage material onto the load material and then fill it into the containment cavity.

[0019] The porous structures of magnesium, carbon, and silicon materials are well-suited to the attachment requirements of solid hydrogen storage materials. Among them, porous magnesium materials can also react with possible acid solutions to supplement hydrogen supply, improving material utilization. Of the two attachment methods, negative pressure suction allows the solid hydrogen storage material to fill the pores of the load material more tightly and uniformly, ensuring maximum reaction contact area. Mixing / adsorption followed by filling is simpler to operate and adaptable to different production scenarios. Both methods can prevent hydrogen storage material from falling off and clogging the exhaust vent, ensuring unobstructed hydrogen supply channels. At the same time, they can improve the reaction uniformity between solid hydrogen storage materials and liquids, further reducing hydrogen supply fluctuations to meet different hydrogen supply needs in agricultural production.

[0020] Preferably, in method 1), when the solid hydrogen storage material is drawn in under negative pressure, the hydrogen supply container is rotated around its axis. Optionally, a low-frequency vibration of 5-10 Hz with an amplitude of 0.1-0.3 mm is simultaneously applied to the receiving cavity. By rotating the hydrogen supply container, the solid hydrogen storage material is more evenly dispersed in the receiving cavity. The low-frequency vibration can promote further filling of the solid hydrogen storage material in the pores of the load material, avoiding the problem of solid hydrogen storage material accumulating on the surface of the load material and not fully utilizing the internal pores during negative pressure drawing in, thereby improving the uniformity of the distribution of the hydrogen storage material in the load material.

[0021] Preferably, the vent of the hydrogen supply container is located at the end opposite to the liquid inlet. Preferably, the feed inlet is located on the same side as the liquid inlet, through which both the loading material and the solid hydrogen storage material can be fed into the receiving cavity, after which the feed inlet can be closed.

[0022] With the above settings, method 1) specifically includes the following steps: The loading material is filled into the receiving cavity from the feed inlet; When a negative pressure is applied to the receiving cavity; After being drawn into the containment cavity, the solid hydrogen storage material moves from the feed port to the suction port, making full contact with the load material and adhering to it within the load material.

[0023] Preferably, the loading material is a porous carbon material with a specific surface area of ​​800-1200 m² / g. Optionally, the surface of the porous carbon material is coated with 1-3 wt% of a hydrophilic modifier by impregnation.

[0024] Porous carbon materials with higher specific surface area can increase the loading capacity of solid hydrogen storage materials and extend the duration of a single hydrogen supply; hydrophilic modifiers can enhance the adsorption and wetting capacity of the loaded material for agricultural liquids, increase the diffusion rate of liquids in the pores of the loaded material, and avoid the problem of delayed hydrogen supply caused by liquid wetting lag.

[0025] Preferably, the load material is subjected to irradiation and / or plasma treatment.

[0026] Irradiation or plasma treatment can increase the porosity and active sites on the surface of the loading material, improve the adhesion and firmness of the solid hydrogen storage material, prevent the hydrogen storage material from falling off during the reaction, and at the same time expand the contact area between the liquid and the hydrogen storage material, making the reaction rate easier to control through the liquid inlet parameters, and further improving the accuracy of hydrogen control.

[0027] Preferably, the irradiation treatment uses gamma-ray irradiation with an irradiation dose of 5-15 kGy; and / or The plasma treatment uses argon plasma with a power of 100-300W and a treatment time of 5-15 minutes.

[0028] Gamma-ray irradiation can efficiently introduce surface defects into the loaded material, while argon plasma further expands the pore channels through physical etching.

[0029] Preferably, the load material includes porous magnesium material. Before or after filling the cavity with porous magnesium material, the porous magnesium material is partially hydrogenated. The hydrogen pressure is 0.5-10 MPa, the holding time is 1-24 h, the temperature is 100-450 °C, and the hydrogenation ratio of the porous magnesium material is controlled to be 10-50%.

[0030] Partially hydrogenated porous magnesium materials retain the structural strength of magnesium, avoiding embrittlement and breakage during insertion into the matrix due to excessive hydrogenation. The resulting hydride magnesium is evenly distributed on the magnesium matrix surface, ensuring stable initial hydrogen supply. Unhydrogenated magnesium can subsequently react with acid to supplement hydrogen supply, extending the hydrogen supply cycle and reducing the need for replenishing the hydrogen storage material, thus improving convenience. A hydrogenation ratio controlled between 10-80% can match the hydrogen requirements of plants at different growth stages. Specific hydrogen pressure, temperature, and insulation time parameters ensure uniform hydrogenation reaction while preserving the pore structure of the porous magnesium material, maintaining uniform adhesion of the solid hydrogen storage material.

[0031] Optionally, a mixture of hydrogen and argon gas may be introduced during the partial hydrogenation process, for example, a hydrogen to argon volume ratio of 1:(0.1-19).

[0032] Argon in the mixed gas can inhibit the excessive accumulation of hydrogen on the surface of porous magnesium materials, avoid the blockage of material pores caused by excessive local hydrogenation, and ensure the porosity retention rate of porous magnesium materials after hydrogenation.

[0033] Preferably, it also includes a control unit and a hydrogen concentration sensor, an acid-base sensor, and a light intensity sensor connected to the control unit, wherein: Hydrogen concentration sensors and pH sensors are installed in agricultural substrates to detect the hydrogen concentration and pH level in the substrates. A light intensity sensor detects the ambient light intensity; The control system adjusts the liquid inlet parameters based on the detection results fed back by the hydrogen concentration sensor, pH sensor and / or light intensity sensor. The hydrogen concentration sensor monitors the substrate hydrogen concentration in real time, avoiding insufficient or excessive hydrogen supply and ensuring that the hydrogen concentration always matches the plant's needs, thus solving the problem of lag in manually adjusting the influent parameters. The pH sensor provides feedback on the substrate's pH level, allowing adjustment of the influent pH or influent volume to prevent fluctuations in substrate pH from affecting the reaction rate between the liquid and the hydrogen storage material, ensuring stable reaction. The light intensity sensor detects ambient light, enabling dynamic adjustment of the hydrogen supply rate. For example, increasing the influent volume when the light is strong can increase hydrogen supply, achieving real-time matching of hydrogen supply with plant needs. The combination of these three components and the automatic control unit eliminates the need for real-time human intervention, further simplifying operations, reducing human error, and adapting to the needs of large-scale, intelligent agricultural production.

[0034] Preferably, the hydrogen concentration sensor is an electrochemical sensor, and the control unit has a built-in crop hydrogen requirement database.

[0035] The control unit can automatically call the corresponding hydrogen demand threshold according to the detected crop variety and growth stage; the electrochemical sensor has higher detection accuracy than the semiconductor sensor, which can avoid the deviation of hydrogen supply regulation caused by detection error; the user only needs to input the crop variety and growth stage, and the control unit can automatically set the liquid inlet parameter regulation logic, without the need for repeated manual adjustments, thus improving the ease of operation.

[0036] In a second aspect of the invention, a continuous hydrogen supply method according to the aforementioned insertable agricultural solid-state hydrogen supply device is also provided, comprising the following steps: S1. The solid hydrogen storage material is placed in the receiving cavity of the hydrogen supply container, and the liquid inlet is connected to the liquid supply source. S2. Insert at least one hydrogen supply container into the agricultural substrate; S3. Adjust the liquid inlet parameters to allow the liquid to react with the solid hydrogen storage material in the containment cavity in a controlled manner to release hydrogen, and the hydrogen gas overflows from the exhaust port into the agricultural substrate. The liquid inlet parameters are adjusted based on the detection results fed back by the hydrogen concentration sensor, pH sensor and / or light intensity sensor. The liquid inlet parameters include at least one of the following: liquid composition, liquid volume, liquid inlet speed and liquid pH value.

[0037] Preferably, the solid hydrogen storage material includes magnesium hydride attached to a porous magnesium material, and step S3 includes at least one of the following steps: (1) Water is introduced into the inlet, and the water reacts with magnesium hydride to release hydrogen; (2) Pass an acid solution into the inlet. The acid solution reacts with magnesium hydride to release hydrogen. (3) Pass an acid solution into the inlet. The acid solution reacts with the porous magnesium material to release hydrogen.

[0038] Depending on the selection and performance of the solid-state hydrogen storage material and the loading material, various reaction scenarios exist depending on the liquid introduced. When water is introduced, since magnesium reacts slowly with water at room temperature, the reaction primarily involves magnesium hydride reacting with water to release hydrogen, representing a one-step hydrogen release stage. As the magnesium hydride reaction is exothermic, the system temperature rises to some extent, and further reaction between magnesium and water cannot be ruled out. When the magnesium hydride reaction is complete, introducing an acid solution results in two steps: the acid continues to react with the remaining small amount of magnesium hydride, and the acid also further reacts with the porous magnesium material to release hydrogen. Furthermore, because the reaction products of magnesium hydride can easily coat and passivate it, and increase the system's pH, alternating the introduction of acid and water into the containment chamber can not only ensure the magnesium hydride reacts fully but also help balance the system's pH.

[0039] Hydrogen release primarily occurs through the reaction of water with magnesium hydride, although some reaction between magnesium and water is also possible. This provides a stable hydrogen source for the early stages of plant growth, and the reaction rate is easily controlled by the liquid inlet rate. The second-step hydrogen release mainly occurs through the reaction of acid solution with porous magnesium, although the reaction between acid solution and magnesium hydride is also possible. This second-step reaction can be initiated when the magnesium hydride reaction is nearing completion or when the plant's hydrogen demand increases, extending the overall hydrogen supply cycle, reducing the need for frequent replacement of hydrogen storage materials, and lowering maintenance costs. Both reactions are completed within the containment chamber, preventing the acid solution from directly contacting the agricultural substrate, avoiding substrate acidification that could damage the soil structure or affect the hydroponic environment, and ensuring substrate stability. The resulting micronutrient salt solution can partially enter the substrate through the vent holes.

[0040] Optionally, the acid solution used in step S3 may include a 0.01-1.5 mol / L citric acid solution.

[0041] Citric acid solution is a biocompatible acid. Compared with strong acids such as hydrochloric acid and sulfuric acid, the corrosion rate of porous magnesium is easier to control. Moreover, the reaction product magnesium citrate can be absorbed by plant roots as a trace magnesium fertilizer, avoiding the acidification or pollution of the substrate caused by the residue of strong acid reaction products.

[0042] The technical solution of the present invention has the following beneficial effects: (1) The insertable agricultural solid hydrogen supply device of the present invention has a simple structure, is easy to use, and has an easy-to-control hydrogen supply rhythm. It only requires simple drilling in existing soilless cultivation and other agricultural substrates to provide space for the hydrogen supply device, without the need for large-scale replacement of existing agricultural equipment. The detachable design of the hydrogen supply device facilitates replacement and maintenance. Furthermore, by adjusting the liquid inlet parameters of the hydrogen supply container, precise, continuous, and stable hydrogen supply to the agricultural substrate can be achieved. The setting of its exhaust port can achieve stable release and directional diffusion of hydrogen, avoiding the problems of rapid hydrogen dissipation and difficulty in maintaining hydrogen supply in traditional hydrogen supply methods. It achieves continuous hydrogen supply that matches the long-term growth of plants and is particularly suitable for modern large-scale agricultural production.

[0043] (2) The present invention adopts a combined hydrogen production method that combines solid hydrogen storage material with porous metal skeleton corrosion to achieve long-term high-concentration hydrogen supply. In particular, it uses porous metal / alloy that can react and release hydrogen as the skeleton for containing hydrogen storage material, and uses a porous loading method to uniformly disperse the hydrogen storage material in the skeleton space, further improving the structural stability and utilization rate of the hydrogen supply raw material.

[0044] (3) By setting up a control unit and various sensors (hydrogen concentration sensor, acid-base sensor, light intensity sensor, etc.), the present invention can detect the hydrogen concentration, acid-base and ambient light intensity of agricultural substrate in real time, and automatically adjust the liquid inlet parameters according to the detection results, thereby realizing intelligent and automated control of the hydrogen supply process and improving the reliability and applicability of the system. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the structure of the insertion-type agricultural solid hydrogen supply device of the present invention; Figure 2 This is a side view of the insert-type agricultural solid hydrogen supply device of the present invention; Figure 3 This is a cross-sectional schematic diagram of a hydrogen supply container in one embodiment of the present invention.

[0047] Explanation of reference numerals in the attached figures: 1-Hydrogen supply container, 2-Solid hydrogen storage material, 3-Loading material, 4-Support cage, 5-Agricultural substrate, 11-Liquid inlet, 12-Vent hole. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] As described in the background section, in order to solve the problems of uneven and unstable hydrogen supply, cumbersome control, high energy consumption, and unsuitability for large-scale production in existing hydrogen agricultural hydrogen supply technologies, this invention provides an insertable agricultural solid hydrogen supply device and a continuous hydrogen supply method. By adjusting the liquid inlet parameters of the hydrogen supply container, the liquid and solid hydrogen storage material react in a controlled manner to release hydrogen, achieving precise, continuous, and stable hydrogen supply to agricultural substrates. The device is also easy to operate and suitable for large-scale agricultural production.

[0051] The insertable agricultural solid hydrogen supply device of the present invention includes a hydrogen supply container 1, a solid hydrogen storage material 2, a load material 3, a support cage 4, a liquid supply device, a control unit, and a sensor assembly. The hydrogen supply container 1 provides a closed reaction space through its internal cavity. With the liquid inlet 11 regulating the liquid inlet parameters and the vent 12 directing hydrogen overflow, it is inserted into the agricultural substrate 5 to achieve a controlled reaction between the liquid and the hydrogen storage material, stably delivering hydrogen to the root zone of the substrate. The solid hydrogen storage material 2 serves as a hydrogen source, reacting with the liquid in the hydrogen supply container 1 to release hydrogen, providing the necessary hydrogen for the plants in the agricultural substrate 5. The load material 3, with its high specific surface area, ensures the solid hydrogen storage material 2 is evenly dispersed and adhered, preventing agglomeration, fixing its position to stabilize the reaction interface, and also adsorbing the liquid for slow release to maintain a stable reaction rate. The support cage 4 is positioned between the hydrogen supply container 1 and the agricultural substrate 5 to prevent the hydrogen supply container 1 from being deformed by the substrate, ensuring the integrity of the closed reaction space, and reducing contact wear between the hydrogen storage container 1 and the agricultural substrate 5. The control unit receives data from the sensor components and adjusts the working status of subsequent water supply devices and other components according to preset logic to achieve automated control of hydrogen supply start / stop and rate adjustment. The sensor components detect hydrogen concentration, pH and ambient light intensity in the agricultural substrate and feed the data back to the control unit in real time to provide a basis for the adjustment of hydrogen supply parameters.

[0052] Specifically, in the exemplary embodiment, the hydrogen supply container 1 adopts a cylindrical structure, integrally molded from polypropylene material using an injection molding process, forming a pair of independent receiving cavities inside. One end of each receiving cavity is provided with a liquid inlet 11 for connecting to an external liquid supply pipeline. The hydrogen supply container 1 also has vent holes 12 communicating with the receiving cavities. Multiple sets of vent holes 12 are spaced axially along the side wall of the cylindrical body, with several holes in each set, the specific number depending on the length of the hydrogen supply container 1. The vent holes 12 penetrate the container wall horizontally or diagonally downwards, ensuring that the released hydrogen diffuses directionally towards the lateral distribution area of ​​the root system, reducing upward loss. Furthermore, the outer wall of the hydrogen supply container 1 has three guide ridges along the axial direction, which reduce resistance and ensure stable insertion direction when inserted into the agricultural substrate, preventing the vent holes from deviating from the root area due to container offset.

[0053] As an alternative embodiment, the material of the hydrogen supply container 1 can be replaced with polytetrafluoroethylene, which has stronger corrosion resistance, to adapt to hydroponic substrate scenarios with strong acidity.

[0054] As an alternative embodiment, the material of the hydrogen supply container 1 can be replaced with durable stainless steel.

[0055] Specifically, in the exemplary embodiment, the solid hydrogen storage material is magnesium hydride (Mg2+). ).

[0056] As an optional implementation method, magnesium hydride (Mg2+) is selected as the solid hydrogen storage material. ), potassium borohydride ( The composite system of magnesium hydride and nano silica has a mass ratio of (4-7):(2-4):(1-2). Among them, magnesium hydride provides a stable basic hydrogen supply, potassium borohydride supplements the hydrogen capacity to extend the hydrogen supply cycle, and nano silica prevents the composite powder from agglomerating through physical dispersion.

[0057] As an alternative implementation, the solid hydrogen storage material is replaced with calcium hydride (… ) and magnesium borohydride ( The system is a composite system with 1.5 wt% talc added as an anti-caking agent. The system has a high hydrogen capacity, which can further provide calcium and boron elements. The talc has high chemical inertness and basically does not have adverse effects with agricultural liquids or substrates.

[0058] Specifically, such as Figure 1As shown, in the exemplary embodiment, the support cage 4 is positioned between the hydrogen supply container 1 and the agricultural substrate 5. The support cage 4 is a cylindrical structure woven from galvanized steel wire to prevent the hydrogen supply container from deforming due to substrate compression. Furthermore, four reinforcing ribs are evenly arranged axially along the inner wall of the support cage 4. These ribs are made of galvanized steel wire of the same material bent to maintain the overall shape stability of the support cage. Additionally, the support cage 4 is equipped with elastic buckles. After the hydrogen supply container 1 is inserted, it can be secured by the buckles to prevent displacement of the container due to substrate loosening during use. The detachable buckle design facilitates subsequent container replacement or replenishment of hydrogen storage material.

[0059] As an alternative embodiment, the material of the support cage 4 can be replaced with stainless steel wire to adapt to long-term open-field use scenarios, thereby extending its service life against soil corrosion; the reinforcing ribs are changed to a spiral structure and wrapped around the inner wall of the support cage, thereby further improving the cage's resistance to compression.

[0060] As another optional embodiment, in a unit length of agricultural substrate, such as inside an incubator, 1-5 support cages 4 are set up in every 1 meter of space. Hydrogen supply devices 1 can be simultaneously inserted into these support cages 4 to supply hydrogen to the agricultural substrate 4, or only partially inserted, or inserted but not simultaneously supplied with liquid and released with hydrogen, supplying liquid in stages according to growth stages and hydrogen demand. When not in use, the insertion channels can be closed with caps at the ends of the support cages to prevent leakage.

[0061] Specifically, in the exemplary embodiment, the load material 3 is filled into the cavity of the hydrogen supply container 1. The load material 3 is preferably a porous magnesium material, which is sintered into a cylindrical shape that fits the cavity by powder metallurgy. Before filling, the porous magnesium material needs to be pretreated: irradiated with γ-rays and / or treated with argon plasma (e.g., power 200W, time 10min) to introduce surface defects, so as to increase the specific surface area of ​​the porous magnesium material and enhance the adhesion of the solid hydrogen storage material.

[0062] Furthermore, the solid hydrogen storage material 2 can be attached to the load material 3 using a negative pressure suction method. First, the pretreated porous magnesium material is filled into the receiving cavity. Then, the suction port, positioned opposite the liquid inlet 11, is connected to the negative pressure device. The solid hydrogen storage material 2 powder is then sucked into the receiving cavity through the liquid inlet 11, ensuring the powder is evenly filled into the pores of the porous magnesium. During the negative pressure suction process, low-frequency vibration can be applied to the receiving cavity simultaneously to promote the powder's penetration into the deeper pores, avoiding uneven reaction caused by surface accumulation.

[0063] As an alternative implementation, the solid hydrogen storage material 2 can be mixed with the load material 3, or the solid hydrogen storage material 2 can be adsorbed onto the load material 3 using negative pressure and then filled into the containment cavity.

[0064] As an optional implementation, the loading material 3 is made of porous magnesium, and the hydrogen supply container 1 is made of stainless steel. The porous magnesium loading material is partially hydrogenated before or after filling. Specifically, the porous magnesium material or the hydrogen supply container 1 filled with porous magnesium material is placed in a high-pressure reactor, hydrogen gas is introduced, the hydrogen pressure is controlled at 0.5-10 MPa, the holding time is 1-24 hours, and the temperature is 100-450℃, so that the hydrogenation ratio of the porous magnesium material is 10-80%, at least converting a portion of the magnesium surface area into magnesium hydride. This treatment preserves the structural strength of magnesium, avoids embrittlement caused by excessive hydrogenation, and enables stable initial hydrogen supply through the generated magnesium hydride. Unhydrogenated magnesium can then react with an acid solution to supplement hydrogen supply, thereby extending the overall hydrogen supply cycle.

[0065] As another optional implementation, during the partial hydrogenation treatment of porous magnesium materials, the hydrogenation atmosphere can also be a hydrogen-argon mixture. A hydrogen-argon volume ratio of 1:(0.1-19) is introduced. The argon in the mixture can inhibit the local accumulation of hydrogen on the porous magnesium surface, preventing excessive hydrogenation from causing pore blockage and maintaining a certain porosity retention rate of the hydrogenated porous magnesium material. Preferably, in the initial stage of hydrogenation, the hydrogen-argon volume ratio is 1:(9-19), and the hydrogen volume ratio can be gradually increased thereafter, for example, to 1:(0.4-9).

[0066] As an optional implementation, the load material 3 can be replaced with a material with a specific surface area of ​​1000 m². 2 / g porous carbon material, which can also be irradiated and / or plasma treated. The surface of the porous carbon material can also be coated with 2wt% polyethylene glycol 400 by impregnation; the high specific surface area of ​​porous carbon can further increase the loading capacity of solid hydrogen storage materials and extend the single hydrogen supply time, while the hydrophilic modifier can accelerate the diffusion rate of agricultural liquids in the pores and avoid hydrogen supply delays caused by liquid wetting lag; in addition, porous carbon has high chemical inertness and does not react with hydrogen storage materials or agricultural liquids, making it suitable for hydroponic scenarios with high substrate purity requirements.

[0067] Specifically, in the exemplary embodiment, the liquid supply device is used to deliver different types of liquids to the inlet 11 of the hydrogen supply container 1, and adjusts the liquid inlet parameters in conjunction with the control unit and sensor assembly to provide a liquid source for the controlled reaction of liquid and solid hydrogen storage materials. It includes a dual liquid storage tank assembly, a liquid supply pipeline and a power control assembly.

[0068] Furthermore, the dual-storage tank assembly is used to store clean water and acid solution separately. The clean water tank is a transparent PET tank with volume markings for easy observation of the remaining water level. The tank opening is equipped with a water filling line with a one-way valve to prevent backflow or impurities from entering. The acid solution tank is made of corrosion-resistant HDPE and is used to store 0.01-1.5 mol / L citric acid solution. The inner wall of the tank is passivated to prevent the acid solution from corroding the tank and causing impurities. Both storage tanks have outlets with filters at the bottom to filter out any particulate impurities that may be present in the liquid, preventing blockage of the hydrogen supply container inlet or the pores of the loading material.

[0069] Furthermore, the liquid supply pipeline connects the inlets of the two storage tanks and the hydrogen supply container to achieve directional liquid delivery. The liquid supply pipeline uses PE pipe, which is corrosion-resistant and flexible to meet the bending requirements of large-scale field deployment. Furthermore, the liquid supply pipeline is equipped with a pressure regulating valve to stabilize the liquid delivery pressure at 0.12-0.15MPa, ensuring that clean water enters the containment cavity of the hydrogen supply container at a slow flow rate, avoiding excessive flow rate impacting the load material and causing the hydrogen storage material to fall off, while ensuring that the clean water uniformly wets the porous magnesium load material, preventing local liquid accumulation that could cause reaction fluctuations.

[0070] Furthermore, the inlet 11 of the hydrogen supply container 1 is equipped with a one-way valve to allow liquid to flow in while preventing gas overflow and liquid backflow.

[0071] Furthermore, the power control component is used to drive liquid delivery and control the liquid inlet parameters. It includes two miniature diaphragm water pumps, which are respectively installed at the outlets of the two storage tanks.

[0072] As another optional implementation, the liquid supply device adopts an integrated liquid storage tank design. The tank is divided into a clean water area and an acid solution area by a partition. The outer wall of the tank is equipped with a control panel, which can manually set the liquid inlet speed, liquid inlet volume and pH value (adjusted by adding a small amount of weak alkali to the acid solution area) to adapt to small-area agricultural hydrogen supply scenarios.

[0073] As another optional implementation, the water supply device's clean water tank inlet pipe is connected to the farmland irrigation system, and irrigation water is introduced through a branch pipe with a flow metering valve to achieve automatic replenishment of clean water and reduce the frequency of manual water addition; the acid solution tank is equipped with an automatic dosing pump, which can automatically replenish citric acid crystals and clean water into the tank according to the feedback from the acid solution concentration sensor installed in the acid solution tank, maintaining the acid solution at a certain concentration to meet the demand for large-scale hydrogen supply.

[0074] As another alternative embodiment for adapting to hydroponic substrates, the liquid supply device is integrated with the hydroponic circulation system, which can introduce part of the nutrient solution as a reaction liquid, triggering the hydrogen storage material to react and supply hydrogen, and providing a small amount of nutrients to the load material, thus realizing an integrated supply of water, fertilizer and hydrogen.

[0075] Specifically, in the exemplary embodiment, the control unit employs a microcontroller, which connects to the liquid supply device and sensor components via a port to achieve data acquisition and command output. An electrochemical hydrogen concentration sensor is embedded in agricultural substrate approximately 5 cm from the vent of the hydrogen supply container to monitor the hydrogen concentration in the root zone in real time. A pH sensor is positioned adjacent to the hydrogen concentration sensor to provide feedback on the substrate's pH level for adjusting the influent pH. A light intensity sensor is installed 10 cm above the crop canopy to monitor ambient light intensity to match the plant's metabolic hydrogen requirements. Furthermore, the control unit incorporates a crop hydrogen requirement database, storing the optimal hydrogen concentration ranges for different growth stages of various common crops such as tomatoes, cucumbers, and lettuce. Users only need to input the crop variety and growth stage through the control panel, and the control unit will automatically retrieve the corresponding threshold, eliminating the need for manual adjustment of the influent parameters.

[0076] As another optional embodiment, the control unit integrates a communication module, which can upload sensor data and equipment operating status to the cloud platform. Users can remotely view hydrogen concentration change curves and equipment fault alarms through a mobile APP, and can also remotely manually adjust the liquid injection rate, thereby adapting to the unmanned operation requirements of large-scale farmland.

[0077] As an optional implementation, an environmental hydrogen concentration detector is also installed in the incubator containing the agricultural substrate to ensure that the hydrogen volume concentration in the gas phase of the incubator is below 3%. If the hydrogen volume concentration exceeds 3%, a safety hazard is identified, the control unit issues a safety alarm, and immediately stops the supply of liquid and hydrogen to the equipment. When the incubator is in an open system, the hydrogen concentration is very low, and the environmental hydrogen concentration detector can be omitted.

[0078] The continuous hydrogen supply method based on the aforementioned plug-in agricultural solid-state hydrogen supply device includes the following steps: S1. The pretreated loading material 3 is filled into the cavity of the hydrogen supply container 1. Magnesium hydride is drawn in and adheres to the pores of the loading material 3 using a negative pressure suction method. Then, the liquid inlet 11 of the hydrogen supply container 1 is connected to the liquid supply device to complete the equipment assembly. The above-mentioned suction loading method is basically applicable to various porous loading materials and has low requirements for the material of the hydrogen supply container 1; or The loading material 3 is a porous magnesium material. The porous magnesium loading material before or after filling is partially hydrogenated, including: placing the porous magnesium material or the hydrogen supply container 1 (made of stainless steel) filled with porous magnesium material in a high-pressure reactor, introducing hydrogen gas, controlling the hydrogen pressure to 0.5-10MPa, holding for 1-24h, and the temperature to 100-450℃, so that the hydrogenation ratio of the porous magnesium material is 10-50%, at least converting a part of the magnesium surface area into magnesium hydride; S2. According to the distribution of crop roots in agricultural substrate 5, multiple support net cages 4 are arranged near the crop roots in agricultural substrate 5, and multiple hydrogen supply containers 1 are inserted into multiple support net cages 4 respectively. S3. The control unit adjusts the liquid inlet parameters based on sensor feedback data. The liquid inlet parameters include the composition of the liquid inlet, the liquid inlet volume, and the liquid inlet rate. S3.1, In the initial hydrogen supply stage, the control unit instructs the solenoid valve corresponding to the water tank to open, and water is introduced into the inlet 11. The inlet rate is set to 3 mL / min, and the single inlet volume is 80 mL. The water reacts with the magnesium hydride on the porous magnesium surface:

[0079] The released hydrogen gas enters the agricultural substrate 5 through the exhaust port 12. The nutrient solution in the agricultural substrate 5 is monitored using a hydrogen concentration sensor to maintain the hydrogen concentration in the nutrient solution at 300-1000 ppb. S3.2 When the hydrogen concentration sensor detects that the concentration is consistently below 300 ppb (e.g., for 5-15 minutes), the control unit switches to acid solution supply, introducing 0.5-1.5 mol / L citric acid solution into the inlet at a rate of 1.5 mL / min. The citric acid mainly reacts with unhydrogenated porous magnesium to supplement hydrogen supply.

[0080] Citric acid can also react with unreacted magnesium hydride, and the reaction product, magnesium citrate, can be absorbed by the roots as a trace magnesium fertilizer, avoiding substrate pollution. S4. When the hydrogen concentration sensor detects a concentration higher than 1000 ppb, or the light intensity sensor detects that the light intensity is lower than 1000 lux for 5 consecutive minutes, the control unit commands the liquid supply device to stop working, and the hydrogen supply device gradually stops releasing hydrogen. If the pH sensor detects that the matrix pH value is lower than 5.5, the control unit adjusts the inlet pH value. At this time, the supply of acid solution can also be stopped and replaced with water to maintain the stability of the reaction.

[0081] As an optional implementation, before step S3, 5-15 mL of clean water is introduced into the cavity of the hydrogen supply container 1 for pre-wetting, followed by the introduction of a small amount of 0.5-1.5 mol / L citric acid solution (approximately 1.5-3 mL). Pre-wetting allows a uniform water film to form on the surface of the supported material (such as porous magnesium). After the acid solution is introduced, it is mixed and diluted by the water film. The initial reaction helps to remove the oxide layer on the surface of the supported material, as well as any impurities such as the oxide passivation layer that may exist on the surface of magnesium hydride. This ensures that the subsequent introduction of clean water can proceed smoothly, and also avoids the violent local reaction caused by direct contact with the citric acid solution. This pre-wetting and initial reaction are beneficial for improving the utilization rate of raw materials and the magnesium content in the matrix.

[0082] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0083] Planting Example 1-1 This invention utilizes the insertable agricultural solid-state hydrogen supply device and continuous hydrogen supply method to cultivate purple lettuce. One hydrogen supply container is inserted into each 1-meter-wide cultivation box. The agricultural substrate inside the cultivation box is a mixture of peat moss, vermiculite, and perlite in a 3:1:1 mass ratio. The total porosity of the substrate is approximately 60%, ensuring looseness and breathability. The system's pH value is maintained between 6 and 7, indicating a moderate acidity and alkalinity. The cylindrical PP hydrogen supply container has an internal diameter of approximately 2 cm and a length of 50 cm. One end of the PP hydrogen supply container has a liquid inlet, and the opposite end has an air intake. The curved cylindrical wall of the column has an exhaust port that connects to the receiving cavity. Multiple sets of exhaust ports are arranged axially along the side wall of the column, with multiple ports in each set. The exhaust ports penetrate the container wall in both horizontal and downward directions.

[0084] The PP hydrogen supply container's cavity is pre-filled with a porous carbon-supported material with a porosity of over 90%. This porous carbon-supported material is a carbonized sponge obtained by high-temperature carbonization of polyvinyl alcohol sponge, and is filled using argon plasma at a power of 150W for 10 minutes.

[0085] Solid hydrogen storage material uses 3g of magnesium hydride ( Using a vacuum negative pressure filling process, magnesium hydride powder is drawn from the air intake hole into the porous carbon-supported material through the liquid inlet hole. While drawing the powder, the hydrogen supply container is slowly rotated around its axis and subjected to a certain low-frequency vibration.

[0086] The inlet is sealed by a one-way valve seat and is connected to the liquid supply source in a closable manner.

[0087] Insert the prepared hydrogen supply container into the support cage of the agricultural substrate.

[0088] The control unit maintains the total hydrogen concentration in the substrate nutrient solution within the incubator between 300-1000 ppm, and continuously adds a total of 1 L of water to the containment chamber over 50 days.

[0089] Planting Examples 1-2 Purple lettuce was grown using the insertable agricultural solid-state hydrogen supply device and continuous hydrogen supply method of the present invention. Two hydrogen supply containers were inserted into each 1-meter wide cultivation box. The two hydrogen supply containers did not overlap horizontally or vertically. Each hydrogen supply container was the same as in planting example 1-1, but each container contained 1.5g of magnesium hydride. ).

[0090] The control unit maintains the total hydrogen concentration in the substrate nutrient solution within the incubator between 300-1000 ppm, and continuously adds 0.5 L of water to each of the two containment chambers over 50 days.

[0091] Planting Examples 1-3 The difference between planting example 1-3 and planting example 1-1 is that the cylindrical PP hydrogen supply container is pre-filled with porous magnesium loading material. The porous magnesium loading material is sintered into a cylindrical shape that fits the container by powder metallurgy process, and is filled with argon plasma at a power of 150W for a processing time of 10 minutes.

[0092] Solid hydrogen storage material uses 3g of magnesium hydride ( Using a vacuum negative pressure filling process, magnesium hydride powder is drawn from the air intake hole into the porous magnesium load material through the liquid inlet hole. While drawing the powder, the hydrogen supply container is slowly rotated around its axis and subjected to a certain low-frequency vibration.

[0093] The inlet is sealed by a one-way valve seat and is connected to the liquid supply source in a closable manner.

[0094] Insert the prepared hydrogen supply container into the support cage of the agricultural substrate.

[0095] The control unit maintains the total hydrogen concentration in the substrate nutrient solution in the incubator between 300-1000 ppm. For the first 40 days, a total of 0.8 L of water is continuously added to the containment chamber, and for the next 10 days, 0.2 L of citric acid solution with a concentration of 0.8 mol / L is continuously added to the containment chamber.

[0096] Planting Examples 1-4 The difference between Planting Examples 1-4 and Planting Examples 1-3 is that the hydrogen supply container is made of stainless steel, but the structure and dimensions are similar to those of Planting Examples 1-3. Its containment cavity is pre-filled with porous magnesium-supported material, which is sintered into a cylindrical shape that fits the containment cavity by powder metallurgy.

[0097] The porous magnesium-supported material in the containment cavity was partially hydrogenated to coat its surface with approximately 3g of magnesium hydride. The hydrogenation conditions included: introducing a mixture of hydrogen and argon (volume ratio 1:0.6) into the porous magnesium-supported material under vacuum, holding at approximately 2.0 MPa hydrogen pressure and 300°C for approximately 12 hours to obtain a magnesium hydride / magnesium mixture.

[0098] The control unit maintains the total hydrogen concentration in the substrate nutrient solution in the incubator between 300-1000 ppm. For the first 40 days, a total of 0.8 L of water is continuously added to the containment chamber, and for the next 10 days, 0.2 L of citric acid solution with a concentration of 0.8 mol / L is continuously added to the containment chamber.

[0099] Planting Examples 1-5 The difference between planting examples 1-5 and planting examples 1-4 is that the control unit controls the total hydrogen concentration in the substrate nutrient solution in the incubator to be between 300-1000 ppm, and water and citric acid solution are alternately introduced over 50 days, including the introduction of 0.4L water, 0.1L citric acid, 0.4L water and 0.1L citric acid in sequence.

[0100] control group The control group did not use hydrogen supply equipment and grew violet lettuce using conventional hydroponics.

[0101] After 50 days, the aboveground fresh weight and vitamin C content of 10 lettuce plants in the incubators of planting examples 1-1 to 1-5 and the control were measured. The maximum and minimum values ​​were removed, and the average of the results from the middle 8 samples was taken. The improvement in yield for planting examples 1-1 to 1-5 compared to the control group is shown in Table 1. Table 1:

[0102] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. An insertable agricultural solid-state hydrogen supply device, characterized in that, Including hydrogen supply containers and solid hydrogen storage materials: The hydrogen supply container includes a receiving cavity, as well as an inlet and an outlet communicating with the receiving cavity, and solid hydrogen storage material is housed in the receiving cavity of the hydrogen supply container. The hydrogen supply container is inserted into the agricultural substrate. By adjusting the liquid inlet parameters, the liquid reacts with the solid hydrogen storage material in the container cavity in a controlled manner to release hydrogen. The hydrogen gas overflows from the exhaust port into the agricultural substrate. The solid hydrogen storage material includes at least one of magnesium hydride, calcium hydride, potassium hydride, ammonia borane, potassium borohydride, magnesium borohydride, and calcium borohydride.

2. The insertable agricultural solid-state hydrogen supply device according to claim 1, characterized in that, The hydrogen supply container has a cylindrical structure, with the liquid inlet located at one end of the cylindrical structure opposite to the insertion direction.

3. The insertable agricultural solid-state hydrogen supply device according to claim 1, characterized in that, A support cage is installed between the hydrogen supply container and the agricultural substrate. The hydrogen supply container is detachably inserted into the support cage, and each vent hole extends horizontally or downward through the container wall.

4. The insertable agricultural solid-state hydrogen supply device according to any one of claims 1-3, characterized in that, The cavity is filled with a loading material, and a solid hydrogen storage material is attached to the loading material. The load material includes at least one of porous metal materials, porous inorganic materials, and porous polymer materials.

5. The insertable agricultural solid-state hydrogen supply device according to claim 4, characterized in that, The load material includes at least one of porous magnesium material, porous carbon material, porous silicon material, and porous polymer material; Within the containment cavity, the solid hydrogen storage material adheres to the load material in at least one of the following ways: 1) After filling the containment cavity with the loading material, the solid hydrogen storage material is drawn into the containment cavity and attached to the loading material by using negative pressure; 2) Mix the solid hydrogen storage material with the load material, or use negative pressure to adsorb the solid hydrogen storage material onto the load material and then fill it into the containment cavity.

6. The insertable agricultural solid-state hydrogen supply device according to claim 5, characterized in that, The load material is subjected to irradiation and / or plasma treatment.

7. The insertable agricultural solid-state hydrogen supply device according to claim 4, characterized in that, The load material includes porous magnesium material. Before or after filling the cavity with porous magnesium material, the porous magnesium material is partially hydrogenated. The hydrogen pressure is 0.5-10 MPa, the holding time is 1-24 h, the temperature is 100-450 °C, and the hydrogenation ratio of the porous magnesium material is controlled to be 10-50%.

8. The insertable agricultural solid-state hydrogen supply device according to any one of claims 5-7, characterized in that, It also includes a control unit and a hydrogen concentration sensor, a pH sensor, and a light intensity sensor connected to the control unit, wherein: Hydrogen concentration sensors and pH sensors are installed in agricultural substrates to detect the hydrogen concentration and pH level in the substrates. A light intensity sensor detects the ambient light intensity; The control system adjusts the liquid inlet parameters based on the detection results fed back by the hydrogen concentration sensor, pH sensor and / or light intensity sensor.

9. A method for continuous hydrogen supply from an insertable agricultural solid-state hydrogen supply device according to any one of claims 1-8, characterized in that, Includes the following steps: S1. The solid hydrogen storage material is placed in the receiving cavity of the hydrogen supply container, and the liquid inlet is connected to the liquid supply source. S2. Insert at least one hydrogen supply container into the agricultural substrate; S3. Adjust the liquid inlet parameters to allow the liquid to react with the solid hydrogen storage material in the containment cavity in a controlled manner to release hydrogen, and the hydrogen gas overflows from the exhaust port into the agricultural substrate. The liquid inlet parameters are adjusted based on the detection results fed back by the hydrogen concentration sensor, pH sensor and / or light intensity sensor. The liquid inlet parameters include at least one of the following: liquid composition, liquid volume, liquid inlet speed and liquid pH value.

10. The continuous hydrogen supply method according to claim 9, characterized in that, Solid hydrogen storage materials include magnesium hydride attached to porous magnesium materials, and step S3 includes at least one of the following steps: (1) Water is introduced into the inlet, and the water reacts with magnesium hydride to release hydrogen; (2) Pass an acid solution into the inlet. The acid solution reacts with magnesium hydride to release hydrogen. (3) Pass an acid solution into the inlet. The acid solution reacts with the porous magnesium material to release hydrogen.

Images