A micro-nano bubble hydrogenation drip irrigation system and control method

Abstract

The present invention provides a micro-nano bubble hydrogenation drip irrigation system and control method, including an aeration unit, a water tank and a drip irrigation unit; the aeration unit is used to generate micro-nano bubbles from the input hydrogen, and the output end of the aeration unit is located in the water tank, which is used to generate hydrogen bubble water; the drip irrigation unit is used to transport the hydrogen bubble water to the roots of crops. The aeration unit includes a first water pump, a Venturi aeration tee and a hydrogen generator; the first water pump inlet is connected to the water tank, and the first water pump outlet is connected to the micro-nano bubble generating device through the Venturi aeration tee and the first flowmeter in sequence; the micro-nano bubble generating device is located in the water tank; the air inlet of the Venturi aeration tee is connected to the hydrogen generator. The hydrogen-rich water produced by the micro-nano bubble hydrogenation drip irrigation system of the present invention has high hydrogen content, fast hydrogen dissolution efficiency, simple system structure, and is easy to operate. It can meet the requirements of drip irrigation and hydrogenation at the same time, and shorten the time required for hydrogenation irrigation.

Description

Technical Field

[0001] The invention relates to the field of hydrogenation drip irrigation, and in particular to a micro-nano bubble hydrogenation drip irrigation system and a control method. Background Art

[0002] Salt stress is one of the main abiotic stresses that seriously affects the growth and development of crops. + Excessive concentrations can damage chlorophyll, causing a sharp drop in the rate of photosynthesis in plants, and limiting the plant's access to nutrients. In addition, the high osmotic pressure of salinized soils can hinder the absorption of water by plant roots, causing them to wither or even die. In order to maintain normal growth and development of plants under salt stress, it is necessary to respond to various interference stresses by changing their own physiological state. Hydrogen can improve the resistance of plants to abiotic stresses such as salt stress, reduce reactive oxygen and lipid peroxidation damage in plants, promote the synthesis of osmotic regulating substances in plant cells, relieve water absorption pressure on plant roots, and eliminate excess Na in cells. + , providing protection for the growth and development of plants under salt stress. In addition, in hydrogen irrigation, hydrogen can also improve the resistance of plants to heavy metal stress, high temperature stress and high light stress, alleviate the oxidative stress response induced by paraquat, improve fruit quality and plant photosynthetic rate, and thus increase crop yields.

[0003] At present, the main way to add hydrogen in hydrogen irrigation is to pump the hydrogen produced by water electrolysis into water to generate hydrogen-rich water for irrigation. However, the traditional method of preparing hydrogen-rich water has the disadvantages of long preparation time, low hydrogen solubility, and short residence time in water. Therefore, hydrogen irrigation is currently mostly used for theoretical experimental research and cannot be put into actual agricultural production. In recent years, micro-nano bubble technology has provided a method to solve the above problems. Due to the small bubble size and large specific surface area, micro-nano bubbles have the characteristics of slow floating speed, long duration, self-pressurized dissolution, and high gas dissolution efficiency, and are good hydrogen carriers in hydrogen irrigation. However, due to the complicated and high price of the previous preparation of micro-nano bubble equipment, it is mostly used in industrial fields such as sewage treatment and petrochemicals, and is less coordinated with agricultural production technology. At present, there is still a lack of mature hydrogen irrigation system design and specific control methods.

[0004] Therefore, the key to meeting the needs of agricultural hydrogenation irrigation is to select a suitable micro-nano bubble generator to match the drip irrigation system, and to reasonably match the device structure with key system parameters such as system operating pressure, flow rate and air intake to achieve the effect of quickly preparing a certain concentration of hydrogen-rich water. Efficiently delivering hydrogen-rich water to the roots of crops through drip irrigation can alleviate soil salt stress, solve problems such as low effective hydrogen delivery, and promote the application of hydrogenation drip irrigation in agricultural production. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a micro-nano bubble hydrogenation drip irrigation system and a control method. The device in the system has a simple structure and low cost, can quickly produce a large number of micro-nano hydrogen bubbles with small particle size, has a fast hydrogen dissolution efficiency, and meets the needs of hydrogenation and irrigation at the same time, and is suitable for promotion to agricultural hydrogenation irrigation production practice.

[0006] The present invention achieves the above technical objectives through the following technical means.

[0007] A micro-nano bubble hydrogenation drip irrigation system comprises an aeration unit, a water tank and a drip irrigation unit; the aeration unit is used to generate micro-nano bubbles from input hydrogen, the output end of the aeration unit is located in the water tank and is used to produce hydrogen bubble water; the drip irrigation unit is used to transport the hydrogen bubble water to the roots of crops.

[0008] Furthermore, the aeration unit includes a first water pump, a Venturi aeration tee and a hydrogen generator; the first water pump inlet is connected to a water tank, and the first water pump outlet is connected to a micro-nano bubble generating device through the Venturi aeration tee and a first flow meter in sequence; the micro-nano bubble generating device is located in the water tank; the air inlet of the Venturi aeration tee is connected to the hydrogen generator, and the hydrogen generator is used to generate hydrogen; a return water pipeline is provided between the first water pump outlet and the water tank.

[0009] Furthermore, a second shut-off valve is provided on the return pipe to control the pressure and flow of the aeration unit during operation; a gas flow controller and a ball valve are installed between the hydrogen generator and the air inlet of the Venturi aeration tee, and the gas flow controller is used to control and measure the hydrogen flow entering the air inlet of the Venturi aeration tee.

[0010] Furthermore, the drip irrigation unit includes a second water pump, a filtering device and a drip irrigation belt; the inlet of the second water pump is connected to the water tank, and the outlet of the second water pump is connected to the drip irrigation belt through the filtering device, the fourth shut-off valve, the third pressure gauge, and the second flow meter in sequence; a plurality of drippers are provided on the drip irrigation belt, and the drippers are located near the roots of the crops.

[0011] Furthermore, the micro-nano bubble generating device is a slit-type micro-nano bubble generator, which breaks bubbles through a turbulent cavity formed by the slit; the slit-type micro-nano bubble generator includes a main body and a pressing plate, an inlet is provided on one surface of the main body, a pressing plate is installed on at least one surface of the main body, a slit is provided between the pressing plate and the main body, and micro-nano bubbles are generated through the turbulent cavity formed by the slit; a main flow channel is provided in the main body, a secondary flow channel is provided between the main flow channel and the slit, and the ratio of the secondary flow channel diameter d1 to the slit L1 is in the range of 5 to 16.

[0012] Furthermore, the first water pump is a vortex pump with a rated flow rate of not less than 1.6m3 / h and a rated head of not less than 50m; to ensure that the aeration unit can prepare high-concentration hydrogen-rich water (>1mg / L) in a short time, the operating pressure of the aeration unit is 0.3-0.6MPa and the flow rate is greater than 1.5m3 / h.

[0013] Furthermore, the second water pump is a centrifugal pump with a rated flow rate of not less than 1m3 / h and a rated head of not less than 20m; to meet the water demand of greenhouses with different irrigation areas, the operating pressure of the drip irrigation unit is 0.1~0.3Mpa and the flow rate is 1~6m3 / h.

[0014] Furthermore, in order to control the equipment cost of the entire micro-nano bubble hydrogenation drip irrigation system and ensure that the aeration unit can achieve the expected hydrogen dissolution effect, when the hydrogen generator produces 0.2-1.0 L / min of hydrogen, a hydrogen storage tank is connected in parallel between the hydrogen generator and the gas flow controller to store hydrogen and adjust the amount of hydrogen in the gas pipeline.

[0015] Furthermore, when the outlet flow rate of a single micro-bubble generating device is greater than 1.5 m3 / h, a plurality of micro-nano bubble generating devices are connected in parallel to the outlet of the first flow meter.

[0016] A control method for a micro-nano bubble hydrogenation drip irrigation system comprises the following steps:

[0017] The first water pump draws water from the water tank and pressurizes and delivers it to the Venturi gas-filling tee to generate negative pressure, so that the hydrogen generated by the hydrogen generator is sucked into the Venturi gas-filling tee to form a gas-liquid mixed flow; the gas-liquid mixed flow is pressurized and flows into the slit-type micro-nano bubble generator to form micro-nano bubbles and release them into the water tank;

[0018] When the amount of dissolved hydrogen in the water tank reaches the set concentration, irrigation is carried out through the drip irrigation unit, and at the same time, water flow equal to the outflow of the drip irrigation unit is injected into the water tank.

[0019] The beneficial effects of the present invention are:

[0020] 1. The micro-nano bubble hydrogenation drip irrigation system and control method described in the present invention has an aeration unit that can circulate aeration, which comprehensively considers the coordination between the system's short-term rapid hydrogenation and long-term effectiveness, and solves the problem of low hydrogen solubility and short residence time in water in traditional hydrogen-rich water.

[0021] 2. The micro-nano bubble hydrogenation drip irrigation system and control method described in the present invention, the micro-nano bubble generating device adopts a regular hexahedron structure, vertical liquid inlet and lateral liquid outlet, which simplifies the difficulty of device processing and manufacturing, and the device structure is exquisite and compact. Bubbles can be generated on the five faces except the top, which can greatly improve the bubble generation efficiency.

[0022] 3. The micro-nano bubble hydrogenation drip irrigation system and control method described in the present invention can prepare high-concentration hydrogen-rich water higher than 1 mg / L by controlling the pressure, flow rate and operating time of the aeration system and the amount of hydrogen required to be provided by the aeration unit.

[0023] 4. The micro-nano bubble hydrogenation drip irrigation system of the present invention integrates hydrogenation aeration and drip irrigation systems, and can meet the requirements of hydrogen aeration and drip irrigation at the same time, shortening the irrigation time. The whole system has a simple structure and is easy to operate, which makes it possible for hydrogen to be widely used in agricultural production. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. The drawings described below are some embodiments of the present invention. For ordinary technicians in this field, it is obvious that other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a schematic diagram of the micro-nano bubble hydrogenation drip irrigation system described in the present invention.

[0026] Figure 2 This is a three-dimensional structural diagram of the micro-nano bubble generating device described in the present invention.

[0027] Figure 3 It is a cross-sectional view of the micro-nano bubble generating device described in the present invention.

[0028] In the figure:

[0029] 1-hydrogen generator; 2-gas flow controller; 3-ball valve; 4-Venturi gas filling tee; 5-first pressure gauge; 6-second pressure gauge; 7-third pressure gauge; 8-first flow meter; 9-second flow meter; 10-first shut-off valve; 11-second shut-off valve; 12-third shut-off valve; 13-fourth shut-off valve; 14-first water pump; 15-second water pump; 16-first check valve; 17-second check valve; 18-micro-nano bubble generating device; 181-main body; 182-gasket; 183-pressing plate; 19-water tank; 20-filter device; 21-drip irrigation tape; d1-diameter of the flow channel inside the bubble generator; L1-thickness of the gasket inside the bubble generator. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] like Figure 1 As shown, the micro-nano bubble hydrogenation drip irrigation system of the present invention comprises an aeration unit, a water tank 19 and a drip irrigation unit; the aeration unit is used to generate micro-nano bubbles from the input hydrogen, and the output end of the aeration unit is located in the water tank 19 for producing hydrogen bubble water; the drip irrigation unit is used to transport the hydrogen bubble water to the roots of crops.

[0034] The aeration unit includes a first water pump 14, a venturi aeration tee 4 and a hydrogen generator 1; the inlet of the first water pump 14 is connected to the water tank 19 through a first check valve 16, and the outlet of the first water pump 14 is connected to the micro-nano bubble generator 18 through a first shut-off valve 10, a first pressure gauge 5, a venturi aeration tee 4, a second pressure gauge 6, and a first flow meter 8 in sequence; the micro-nano bubble generator 18 is located in the water tank 19; the air inlet of the venturi aeration tee 4 is connected to the hydrogen generator 1, and the hydrogen generator 1 is used to generate hydrogen; a return water pipeline is provided between the outlet of the first water pump 14 and the water tank 19. A second shut-off valve 11 is provided on the return water pipeline to control the pressure and flow rate of the aeration unit operation; a gas flow controller 2 and a ball valve 3 are installed between the hydrogen generator 1 and the air inlet of the venturi aeration tee 4, and the gas flow controller 2 is used to control and measure the hydrogen flow entering the air inlet of the venturi aeration tee 4.

[0035] The drip irrigation unit includes a second water pump 15, a filter device 20 and a drip irrigation belt 21; the inlet of the second water pump 15 is connected to the water tank 19, and the outlet of the second water pump 15 is connected to the drip irrigation belt 21 through the filter device 20, the fourth shut-off valve 13, the third pressure gauge 7, and the second flow meter 9 in sequence; a plurality of drippers are provided on the drip irrigation belt 21, and the drippers are located near the roots of the crops. Another return water pipeline is provided between the outlet of the second water pump 15 and the water tank 19. The return water pipeline is provided with a third shut-off valve 12 for controlling the pressure and flow of the drip irrigation unit.

[0036] like Figure 2 and Figure 3 As shown, the micro-nano bubble generating device 18 is a slit-type micro-nano bubble generator, which breaks bubbles through a turbulent cavity formed by the slit; the slit-type micro-nano bubble generator includes a main body 181 and a pressing plate 183, an inlet is provided on one surface of the main body 181, and a pressing plate 183 is installed on at least one surface of the main body 181, a slit is provided between the pressing plate and the main body 181, and micro-nano bubbles are generated through the turbulent cavity formed by the slit; a main flow channel is provided in the main body 181, and a secondary flow channel is provided between the main flow channel and the slit, and the ratio of the secondary flow channel diameter d1 to the slit L1 is in the range of 5 to 16.

[0037] The first water pump 14 is a vortex pump with a rated flow rate of not less than 1.6m3 / h and a rated head of not less than 50m; the operating pressure of the aeration unit is 0.3-0.6MPa, and the flow rate is greater than 1.5m3 / h. The second water pump 15 is a centrifugal pump with a rated flow rate of not less than 1m3 / h and a rated head of not less than 20m; the operating pressure of the drip irrigation unit is 0.1-0.3Mpa, and the flow rate is 1-6m3 / h. When the hydrogen generator 1 produces 0.2-1.0L / min of hydrogen, a hydrogen storage tank is connected in parallel between the hydrogen generator 1 and the gas flow controller 2 to store hydrogen and adjust the amount of hydrogen in the gas pipeline. When the outlet flow rate of a single microbubble generating device 18 is greater than 1.5m3 / h, a plurality of micro-nano bubble generating devices 18 are connected in parallel at the outlet of the first flowmeter 8.

[0038] Working principle: The aeration unit pumps water from the water tank 19 through the water pump 14, and transports it to the outlet pipe and the return pipe under pressure. The water flows at high speed through the Venturi aeration tee 4 in the middle of the outlet pipe to generate negative pressure, and the hydrogen prepared by the hydrogen generator 1 is introduced into the outlet pipe to form a gas-liquid mixed flow. The mixed flow is pressurized and flows into the slit-type micro-nano bubble generator 18, where it is broken to form micro-nano bubbles and released into the water tank 19. The system pressure and flow of the aeration unit are controlled by the shut-off valve 11 and the shut-off valve 10, and monitored by the pressure gauge 5, the pressure gauge 6 and the flow meter 8. The structure of the slit-type micro-nano bubble generator 18 is as shown in FIG. Figure 2 As shown, the specific working principle is that after the hydrogen and water are initially mixed through the Venturi gas adding tee 4, they flow into the device body 181 from the inlet at the top of the device, and are diverted from the main flow channel to 5 secondary flow channels. Then, the mixed liquid in each secondary flow channel is broken into micro-nano bubbles by high speed and high pressure in the tiny gap formed by the main body 181, the gasket 182 and the pressure plate 183, and flows out from all around the gaps to form micro-nano bubble hydrogen-rich water. Hydrogen is prepared by the hydrogen generator 1, and the amount of hydrogen flowing into the Venturi gas adding tee 4 is controlled by the gas flow controller 2 and the ball valve 3. The drip irrigation part extracts the prepared micro-nano bubble hydrogen-rich water in the water tank 19 by the water pump 15, and pressurizes and transports it through the filter device 20 to the drip irrigation belt 21, and finally the micro-nano bubble hydrogen-rich water is drip-irrigated near the roots of the plants by the drip irrigation belt 21. The system pressure of the drip irrigation part is controlled by the shut-off valve 12 and the shut-off valve 13, and monitored by the pressure gauge 7 and the flow meter 9. The filter device 20 will filter out the tiny impurities contained in the hydrogen-rich water to prevent the drip irrigation belt 21 from being blocked. After the aeration unit runs for 3 to 5 minutes, the drip irrigation unit is started for irrigation, and at the same time, the same outflow rate as the drip irrigation system is injected into the water tank to maintain the dynamic balance of the total water volume in the water tank, so as to realize the preparation of hydrogen-rich water and real-time irrigation by the micro-nano bubble hydrogenation drip irrigation system.

[0039] The water tank capacity is 60-250L, the aeration system operation time is not less than 3 minutes, preferably 5 minutes; the water inlet, water outlet and return pipes all use pipes of the same standard diameter of DN20 and above, and the air inlet pipe uses a pressure-resistant air pipe with an inner diameter of 3-8mm.

[0040] Example 1

[0041] like Figure 1 and Figure 2 As shown, the models of the pipes and accessories of the micro-nano bubble hydrogenation drip irrigation system are all DN 20, the rated flow rate of the first water pump 14 is 1.6m3 / h, and the rated head is 80m; the rated flow rate of the second water pump 15 is 1.5m3 / h, and the rated head is 20m; the first flow meter 8 and the second flow meter 9 are both turbine flow meters with a range of 1-50L / min and an accuracy of ±1%, and the ranges of the first pressure gauge 5, the second pressure gauge 6 and the third pressure gauge 7 are all 0-1MPa, and the top of the water tank is transparent and removably sealed, and its volume is 120L. In the gas-filling part, the hydrogen generator model is TH-500, which can generate 500ml of hydrogen per minute, and the gas flow controller model is D07, with an accuracy of ±1%. The main body of the slit-type micro-nano bubble generator is a regular hexahedron with a side length of 50mm, the diameter d1 of each flow channel is 4mm, the gap L1 is 0.5mm, and the generator body, gasket and pressure plate are fixed with screws.

[0042] The micro-nano bubble aeration system is operated, the second shut-off valve 11 is adjusted to make the system operating pressure 350KPa, the gas flow controller 2 is adjusted, the hydrogen is controlled to enter the main pipeline at 250ml / min and mix with water, and a single slit micro-nano bubble generator is used for operation. The test shows that the average particle size of the bubbles generated by the aeration system is about 30 microns, and about 25L of hydrogen-rich water can be prepared per minute. In the first 3 minutes of operation, the amount of hydrogen dissolved in 100L of water in the water tank increases by 0.37mg / L per minute, and reaches a peak of 1.61mg / L after 5 minutes of operation. When the operation stops for 10 minutes, the hydrogen content in the water is still above 1.4mg / L, meeting the demand for hydrogen-rich water irrigation.

[0043] Example 2

[0044] On the basis of the equipment described in the above embodiment 1, the number of slit-type micro-nano bubble generators is increased to 3, and the hydrogen is controlled to enter the main pipeline at 500ml / min to mix with water, and the operating pressure of the aeration system is adjusted to 300KPa. At this time, the system can prepare 70L / min of micro-nano bubble hydrogen-rich water. After the aeration system runs for 3 minutes, clean water is injected into the water tank 19 at 40L / min, and the drip irrigation system is turned on at 150KPa and 40L / min. The operating conditions can achieve a dynamic balance of the hydrogen-rich water content in the water tank, and the stable hydrogen content of the hydrogen-rich water in the water tank is measured to be higher than 1.2mg / L, which can realize the real-time preparation of a certain concentration of hydrogen-rich water, shorten the time required for hydrogenation irrigation, and can increase the land area that can be irrigated after hydrogen-rich water treatment. After the preparation of hydrogen-rich water is completed, the drip irrigation system is operated, and the operating pressure of the control system of the third shut-off valve 12 is adjusted to 150KPa, the irrigation flow rate is 40L / min, the flow rate of each dripper is 0.03L / min, and the dripper spacing is 20cm, so the total length of irrigation can be 240m. In agricultural greenhouse planting, a single ridge length of 80m, a ridge width of 0.8m, and a ridge spacing of 0.7m are set. The drip irrigation system can irrigate an area of ​​about 360m 2 The micro-nano bubble hydrogenation system can meet the irrigation needs of more than 1 mu of farmland in a single treatment.

[0045] A control method for a micro-nano bubble hydrogenation drip irrigation system comprises the following steps:

[0046] The first water pump 14 pumps water from the water tank 19 and pressurizes the water to the Venturi gas filling tee 4 to generate negative pressure, so that the hydrogen generated by the hydrogen generator 1 is sucked into the Venturi gas filling tee 4 to form a gas-liquid mixed flow; the gas-liquid mixed flow is pressurized and flows into the gap-type micro-nano bubble generator 18 to form micro-nano bubbles and release them into the water tank 19;

[0047] After the amount of dissolved hydrogen in the water tank 19 reaches a set concentration, irrigation is performed through the drip irrigation unit, and at the same time, water flow equal to the outflow of the drip irrigation unit is injected into the water tank 19.

[0048] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0049] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. All equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A micro-nano bubble hydrogenation drip irrigation system, characterized in that: It comprises an aeration unit, a water tank (19) and a drip irrigation unit; the aeration unit is used to generate micro-nano bubbles from input hydrogen, the output end of the aeration unit is located in the water tank (19) and is used to produce hydrogen bubble water; the drip irrigation unit is used to transport the hydrogen bubble water to the roots of crops; The aeration unit comprises a first water pump (14), a Venturi aeration tee (4) and a hydrogen generator (1); the inlet of the first water pump (14) is connected to a water tank (19), and the outlet of the first water pump (14) is connected to a micro-nano bubble generating device (18) via the Venturi aeration tee (4) and a first flow meter (8) in sequence; the micro-nano bubble generating device (18) is located in the water tank (19); the air inlet of the Venturi aeration tee (4) is connected to the hydrogen generator (1), The hydrogen generator (1) is used to generate hydrogen; a return pipe is provided between the outlet of the first water pump (14) and the water tank (19); the drip irrigation unit comprises a second water pump (15), a filter device (20) and a drip irrigation belt (21); the inlet of the second water pump (15) is connected to the water tank (19), and the outlet of the second water pump (15) is connected to the drip irrigation belt (21) via the filter device (20), the fourth shut-off valve (13), the third pressure gauge (7) and the second flow meter (9) in sequence; A second shut-off valve (11) is provided on the return water pipeline for controlling the pressure and flow rate of the aeration unit during operation; a gas flow controller (2) and a ball valve (3) are installed between the hydrogen generator (1) and the air inlet of the Venturi aeration tee (4); the gas flow controller (2) is used to measure the hydrogen flow rate entering the air inlet of the Venturi aeration tee (4).

2. The micro-nano bubble hydrogenation drip irrigation system according to claim 1, characterized in that: The drip irrigation belt (21) is provided with a plurality of drippers, and the drippers are located near the roots of the crops.

3. The micro-nano bubble hydrogenation drip irrigation system according to claim 1, characterized in that: The micro-nano bubble generating device (18) is a slit-type micro-nano bubble generator, which breaks bubbles through a turbulent cavity formed by the slit; the slit-type micro-nano bubble generator comprises a main body (181) and a pressing plate (183); an inlet is provided on one surface of the main body (181); a pressing plate (183) is installed on at least one surface of the main body (181); a slit is provided between the pressing plate and the main body (181); micro-nano bubbles are generated through the turbulent cavity formed by the slit; a main flow channel is provided in the main body (181); a secondary flow channel is provided between the main flow channel and the slit; the ratio of the secondary flow channel diameter d1 to the slit L1 is in the range of 5 to 16.

4. The micro-nano bubble hydrogenation drip irrigation system according to claim 1, characterized in that: The first water pump (14) is a vortex pump with a rated flow rate of not less than 1.6 m³ / h and a rated head of not less than 50 m; the operating pressure of the aeration unit is 0.3-0.6 MPa, and the flow rate is greater than 1.5 m³ / h.

5. The micro-nano bubble hydrogenation drip irrigation system according to claim 1, characterized in that: The second water pump (15) is a centrifugal pump with a rated flow rate of not less than 1 m³ / h and a rated head of not less than 20 m; the operating pressure of the drip irrigation unit is 0.1-0.3 MPa, and the flow rate is 1-6 m³ / h.

6. The micro-nano bubble hydrogenation drip irrigation system according to claim 1, characterized in that: When the hydrogen generator (1) generates hydrogen at a rate of 0.2 to 1.0 L / min, a hydrogen storage tank is connected in parallel between the hydrogen generator (1) and the gas flow controller (2) to store hydrogen and adjust the amount of hydrogen in the gas pipeline.

7. The micro-nano bubble hydrogenation drip irrigation system according to claim 1, characterized in that: When the outlet flow rate of a single micro-nano bubble generating device (18) is greater than 1 m³ / h, a plurality of micro-nano bubble generating devices (18) are connected in parallel to the outlet of the first flow meter (8).

8. A control method for a micro-nano bubble hydrogenation drip irrigation system according to any one of claims 1 to 7, characterized in that: The steps include: The first water pump (14) pumps water from the water tank (19) and conveys it under pressure to the Venturi gas filling tee (4) to generate negative pressure, so that the hydrogen generated by the hydrogen generator (1) is sucked into the Venturi gas filling tee (4) to form a gas-liquid mixed flow; the gas-liquid mixed flow is pressurized and flows into the micro-nano bubble generating device (18), forming micro-nano bubbles and releasing them into the water tank (19); After the amount of dissolved hydrogen in the water tank (19) reaches a set concentration, irrigation is performed through the drip irrigation unit, and at the same time, a water flow rate equal to the outflow rate of the drip irrigation unit is injected into the water tank (19).

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