Normal temperature and pressure contact electrification type off-grid ammonia production and collection system

Abstract

This invention relates to the field of ammonia production technology, specifically to an off-grid ammonia production and collection system based on contact electrification at ambient temperature and pressure. The system includes a gas supply unit, a microbubble generating unit, a reaction unit, an ammonia collection unit, and an energy supply unit. The gas supply unit is connected to the microbubble generating unit, which is connected to the reaction unit, and the reaction unit is connected to the ammonia collection unit. The ammonia collection unit and the microbubble generating unit form a gas return path. The energy supply unit supplies power to each unit. The reaction unit contains a water suspension system with hydrophobic fluoropolymer particles. Microbubbles, stirring, and ultrasound are used to enhance the three-phase interface contact, and contact electrification is used to activate nitrogen for ammonia production. This invention can operate independently at ambient temperature and pressure without an external power grid, enabling on-site ammonia preparation and collection, reducing reliance on high-temperature and high-pressure equipment and centralized storage and transportation systems, and improving the system's applicability in decentralized applications such as remote areas and agricultural sites.

Description

Technical Field

[0001] This invention relates to the field of ammonia production technology, specifically to an off-grid ammonia production and collection system based on ambient temperature and pressure contact electrification. Background Technology

[0002] Ammonia is an important basic chemical raw material and a source of nitrogen in agriculture, widely used in the production of fertilizers such as urea, ammonium nitrate, and ammonium phosphate. Therefore, its low-cost acquisition and decentralized supply are of great significance. Current industrial ammonia production still mainly relies on the Haber-Bosch process. This type of process usually requires high temperature and high pressure conditions and depends on relatively complex reaction, compression, and power supply equipment. The overall plant is large-scale, operates under harsh conditions, and has high construction and maintenance costs.

[0003] While green ammonia technology, developed on this basis, introduces renewable energy sources for hydrogen production, it still largely follows a process route combining water electrolysis for hydrogen production, air separation for nitrogen production, and ammonia synthesis. This means it still places high demands on power supply stability, equipment integrity, and system integration, and faces limitations in miniaturization and decentralized applications. Furthermore, it relies on a continuous or adjustable energy supply. In addition, some research has attempted to achieve nitrogen to ammonia conversion under ambient temperature and pressure conditions, but these methods still lack directly applicable technical solutions for system integration and engineering implementation.

[0004] Meanwhile, current mainstream ammonia production technologies generally employ centralized production methods, typically requiring subsequent storage and long-distance transportation. This increases acquisition costs in decentralized or on-site application environments and is subject to limitations in transportation conditions and infrastructure. Therefore, in light of these issues, there is an urgent need to develop an off-grid ammonia production and collection system based on ambient temperature and pressure contact electrification to overcome the shortcomings in current practical applications. Summary of the Invention

[0005] The purpose of this invention is to provide an off-grid ammonia generation and collection system based on ambient temperature and pressure contact electrification, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An off-grid ammonia production and collection system with ambient temperature and pressure contact electrification includes a gas supply unit, a microbubble generation unit, a reaction unit, an ammonia collection unit, and an energy supply unit.

[0008] The outlet of the gas supply unit is connected to the inlet of the microbubble generating unit, the outlet of the microbubble generating unit is connected to the inlet of the reaction unit, the outlet of the reaction unit is connected to the inlet of the ammonia collection unit, and the tail gas outlet of the ammonia collection unit is connected to the return inlet of the microbubble generating unit, forming a closed gas return path.

[0009] The power supply unit is electrically connected to the gas supply unit, the microbubble generating unit, the reaction unit and the ammonia collection unit respectively, and is used to provide operating power to each unit;

[0010] The reaction unit contains an aqueous suspension system with hydrophobic fluoropolymer particles. The reaction unit is also equipped with a stirring device and an ultrasonic device. The stirring device and the ultrasonic device work together to enhance the contact between nitrogen microbubbles and the gas-liquid-solid three-phase interface of the aqueous suspension system, and realize the nitrogen activation to produce ammonia by utilizing the contact electrostatic effect.

[0011] As a further aspect of the present invention: the nitrogen source of the gas supply unit is selected from any one of deoxygenated air, nitrogen generator or nitrogen cylinder;

[0012] A shut-off valve, a pressure reducing valve, and a gas flow meter are sequentially installed on the pipeline between the gas supply unit and the microbubble generating unit.

[0013] As a further aspect of the present invention: the microbubble generating unit is used to convert nitrogen gas into micron-sized bubbles with a particle size of 10-100 μm;

[0014] The microbubble generating unit is selected from any one of the Venturi type, porous aeration type, or jet type microbubble generating devices.

[0015] As a further aspect of the present invention: the reaction unit further includes a sealed vertical reaction vessel, an inlet pipe, and an outlet pipe;

[0016] One end of the air inlet pipe is connected to the air outlet of the microbubble generating unit, and the other end extends into the bottom of the reaction vessel.

[0017] One end of the outlet pipe is connected to the top of the reaction vessel, and the other end is connected to the inlet of the ammonia collection unit.

[0018] The stirring device is installed on the top of the reaction vessel, and its stirring shaft extends into the interior of the water suspension system;

[0019] The ultrasonic device is installed on the side wall or bottom of the reaction vessel, and its ultrasonic emitting surface is in contact with the water suspension system.

[0020] As a further aspect of the present invention: the ammonia collection unit includes at least one absorption container, the absorption container containing an absorption liquid;

[0021] The bottom of the absorption container is equipped with a drain pipe for discharging the ammonia-containing absorption liquid product.

[0022] As a further aspect of the present invention: the ammonia collection unit includes two absorption containers arranged in series;

[0023] The top air outlet of the first absorption container is connected to the bottom air inlet of the second absorption container, and the top air outlet of the second absorption container is connected to the return air inlet of the microbubble generating unit.

[0024] As a further embodiment of the present invention: the ammonia collection unit further includes a pH detection device, a dosing device, and a regulating solution storage bottle;

[0025] The detection end of the pH detection device extends into the absorbent liquid of the absorption container, and its signal output end is connected to the control end of the dosing device.

[0026] The inlet of the dosing device is connected to the outlet of the regulating solution storage bottle via a dosing pipe, and the outlet of the dosing device is connected to the inlet of the absorption container via a dosing pipe.

[0027] The dosing device adjusts the dosage according to the detection result of the pH detection device to maintain the pH value of the absorption liquid within the range of 5.5-6.5.

[0028] As a further aspect of the present invention: the absorbent is selected from water or a solution containing a weakly acidic component;

[0029] The conditioning solution stored in the conditioning solution storage bottle is phosphoric acid or its corresponding weak acid salt solution.

[0030] As a further aspect of the present invention: the energy supply unit includes a combination of a solar power supply device and an energy storage device, the solar power supply device includes a solar photovoltaic panel, and the energy storage device includes a battery, a charge / discharge controller, and an inverter.

[0031] As a further aspect of the present invention: the hydrophobic fluoropolymer particles are polytetrafluoroethylene particles.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] 1. Achieve ammonia preparation under normal temperature and pressure conditions by constructing a gas-liquid-solid three-phase reaction system based on the contact electrification effect, so that nitrogen can be activated and ammonia can be generated under normal temperature and pressure conditions, thereby avoiding dependence on high temperature and high pressure conditions, simplifying the system structure and reducing the requirements for operating conditions;

[0034] 2. Improve the efficiency and stability of the gas-liquid-solid three-phase reaction. Nitrogen gas is converted into microbubbles through the microbubble generating unit. Combined with the synergistic effect of the stirring device and the ultrasonic device, the contact efficiency of the three-phase interface is enhanced. At the same time, the dispersion state of the hydrophobic fluoropolymer particles in the aqueous suspension system is maintained, which is conducive to improving the reaction efficiency and enhancing the stability of the system.

[0035] 3. It has the capability to operate off-grid. Due to the adoption of a reaction method based on normal temperature and pressure, the overall energy consumption of the system and the requirements for the scale of energy supply are reduced, enabling the system to operate under low power supply conditions.

[0036] 4. Achieve integration of ammonia production and collection, reducing intermediate steps. By integrating the reaction unit with the ammonia collection unit and absorbing the generated ammonia in situ, ammonia is produced in liquid phase, matching the application scenario of off-grid operation. This reduces gas storage, transportation and secondary treatment steps, lowers system process complexity and improves system integration. Attached Figure Description

[0037] Figure 1 This is an overall block diagram of the ambient temperature and pressure contact-energized off-grid ammonia generation and collection system in an embodiment of the present invention.

[0038] Figure 2 This is a schematic diagram of the structure of the reaction unit in an embodiment of the present invention.

[0039] Figure 3 This is a schematic diagram of the ammonia collection unit in an embodiment of the present invention.

[0040] In the diagram: 1-Gas supply unit, 2-Microbubble generating unit, 3-Reaction unit, 4-Ammonia collection unit, 5-Energy supply unit, 31-Reaction container, 32-Inlet pipe one, 33-Outlet pipe, 34-Stirring device, 35-Ultrasonic device, 41-Absorption container, 42-Inlet pipe two, 43-Exhaust pipe, 44-pH detection device, 45-Dosing device, 46-Adjusting liquid storage bottle, 47-Dosing pipe, 48-Drain pipe. Detailed Implementation

[0041] 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.

[0042] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0043] Please see Figures 1-3 The present invention provides an off-grid ammonia production and collection system with ambient temperature and pressure contact electrification, comprising a gas supply unit 1, a microbubble generating unit 2, a reaction unit 3, an ammonia collection unit 4, and an energy supply unit 5.

[0044] The outlet of the gas supply unit 1 is connected to the inlet of the microbubble generating unit 2, the outlet of the microbubble generating unit 2 is connected to the inlet of the reaction unit 3, the outlet of the reaction unit 3 is connected to the inlet of the ammonia collection unit 4, and the tail gas outlet of the ammonia collection unit 4 is connected to the return inlet of the microbubble generating unit 2, forming a closed gas return path; the energy supply unit 5 is connected to the gas supply unit 1, the microbubble generating unit 2, the reaction unit 3 and the ammonia collection unit 4 through circuits, providing the electrical energy required for the operation of each unit.

[0045] This system integrates the above-mentioned units and adopts a reaction mechanism based on the contact electrification effect, which can realize the conversion of nitrogen into ammonia under normal temperature and pressure conditions. It does not rely on an external fixed power grid and can realize the on-site preparation and collection of ammonia in decentralized scenarios such as the field and the surrounding areas of agricultural land, effectively reducing the dependence on high temperature and high pressure equipment, large industrial infrastructure and ammonia storage and transportation links.

[0046] In one embodiment of the present invention, the gas supply unit 1 is used to supply nitrogen gas required for the reaction to the system. The nitrogen source can be any one of deoxygenated air, a nitrogen generator, or an external nitrogen cylinder. In this embodiment, a nitrogen cylinder is preferred as the nitrogen source to reduce system operating energy consumption and improve operational stability under off-grid conditions. The outlet of the gas supply unit 1 is connected to the inlet of the microbubble generator unit 2 via a pipeline. A shut-off valve, a pressure reducing valve, and a gas flow meter can be sequentially installed on the pipeline to control the on / off state, pressure, and flow rate of the nitrogen gas. The power supply terminal of the gas supply unit 1 is electrically connected to the output terminal of the power supply unit 5.

[0047] The microbubble generating unit 2 is used to convert the nitrogen gas supplied by the gas supply unit 1 into micron-sized bubbles. Its inlet is connected to the outlet of the gas supply unit 1, its return inlet is connected to the tail gas outlet of the ammonia collection unit 4, and its outlet is connected to the inlet of the reaction unit 3. The microbubble generating unit 2 can be a conventional microbubble generating device in the art, such as a Venturi type, a porous aeration type, or a jet type. It can convert nitrogen gas into micron-sized bubbles with a particle size of 10-100 μm, significantly improving the gas-liquid contact area, enhancing mass transfer efficiency, and providing a good foundation for subsequent three-phase contact reactions. The power supply terminal of the microbubble generating unit 2 is connected to the output terminal of the power supply unit 5.

[0048] In one embodiment of the present invention, such as Figure 2As shown, the reaction unit 3 includes a reaction container 31, an inlet pipe 32, an outlet pipe 33, a stirring device 34, and an ultrasonic device 35. The reaction container 31 is a sealed vertical container containing an aqueous suspension system of hydrophobic fluoropolymer particles. One end of the inlet pipe 32 is connected to the outlet of the microbubble generating unit 2, and the other end extends into the bottom of the reaction container 31 to introduce nitrogen microbubbles into the bottom of the suspension system. One end of the outlet pipe 33 is connected to the top of the reaction container 31, and the other end is connected to the inlet of the ammonia collection unit 4 to exhaust the ammonia-containing gas generated in the reaction.

[0049] The stirring device 34 is installed on the top of the reaction vessel 31, and its stirring shaft extends into the interior of the suspension system. The power supply terminal of the stirring device 34 is connected to the output terminal of the power supply unit 5. The stirring device 34 is used to enhance the overall fluidity of the system, so that the nitrogen microbubbles and suspended particles are fully mixed, while maintaining the uniform dispersion of hydrophobic fluoropolymer particles in the water suspension system, inhibiting particle sedimentation, agglomeration or local enrichment, and improving the stability of the reaction system.

[0050] The ultrasonic device 35 is installed on the side wall or bottom of the reaction vessel 31, and its ultrasonic emitting surface is in contact with the suspension system. The power supply end of the ultrasonic device 35 is connected to the output end of the power supply unit 5. The ultrasonic device 35 is used to generate high-frequency vibration, further promote the dispersion and refinement of nitrogen microbubbles, enhance the contact efficiency of the gas-liquid-solid three-phase interface, and work in synergy with the stirring device 34 to significantly improve the reaction rate of nitrogen activation and ammonia generation.

[0051] In one embodiment of the present invention, such as Figure 3 As shown, the ammonia collection unit 4 includes an absorption container 41, an inlet pipe 42, an exhaust pipe 43, a pH detection device 44, a dosing device 45, a regulating liquid storage bottle 46, a dosing pipe 47, and a drain pipe 48. In this embodiment, two absorption containers 41 are preferably arranged in series to improve the overall absorption efficiency of ammonia. Each absorption container 41 contains an absorbent, which can be water or a solution containing a weakly acidic component.

[0052] One end of the second inlet pipe 42 is connected to the outlet pipe 33 of the reaction unit 3, and the other end extends into the bottom of the first absorption container 41 to introduce ammonia-containing gas into the absorption liquid; the top outlet of the first absorption container 41 is connected to the bottom inlet of the second absorption container 41 through a pipeline, the top outlet of the second absorption container 41 is connected to one end of the exhaust pipe 43, and the other end of the exhaust pipe 43 is connected to the return inlet of the microbubble generating unit 2 to return unabsorbed nitrogen gas to the reaction system for recycling.

[0053] The detection end of the pH detection device 44 extends into the absorbent liquid in the absorption container 41 to detect the acidity or alkalinity of the absorbent liquid in real time; the signal output end of the pH detection device 44 is connected to the control end of the dosing device 45, and the power supply end of the pH detection device 44 is connected to the output end of the power supply unit 5.

[0054] The inlet of the dosing device 45 is connected to the outlet of the conditioning solution storage bottle 46 via a dosing pipe 47, and the outlet of the dosing device 45 is connected to the filling port of the absorption container 41 via a dosing pipe 47. The power supply terminal of the dosing device 45 is connected to the output terminal of the power supply unit 5. The conditioning solution storage bottle 46 is used to store pH conditioning solution, which is preferably a solution of phosphoric acid or its corresponding weak acid salt, capable of converting absorbed ammonia into ammonium nitrogen, improving absorption stability, and the resulting ammonia-containing absorption solution can be directly used for agricultural application.

[0055] The drain pipe 48 is located at the bottom of the absorption container 41 and is used to discharge the ammonia-containing absorbent liquid after absorption as a product. A drain valve can be installed on the drain pipe 48 to control the timing and amount of product discharge.

[0056] During ammonia absorption, when the pH of the absorbent is higher than 6.5, the dosing device 45 is activated to add an adjusting solution into the absorption container 41; when the pH is lower than 5.5, the dosing device 45 stops adding chemicals, maintaining the pH of the absorbent in a weakly acidic range of 5.5-6.5, thereby effectively improving the ammonia absorption efficiency and inhibiting the re-evaporation of ammonia, ensuring the continuous and stable progress of the absorption process.

[0057] In one embodiment of the present invention, the power supply unit 5 is used to provide electrical energy to all electrical devices in the system. It can be selected from one or more combinations of an external power source, a power generation device, or an energy storage device. In this embodiment, a combination of a solar power supply device and an energy storage device is preferred, including a solar photovoltaic panel, a battery, a charge / discharge controller, and an inverter. This allows the system to convert solar energy into electrical energy and store it, enabling continuous independent operation of the system without an external power grid. The output terminal of the power supply unit 5 is respectively connected to the power supply circuits of the gas supply unit 1, the microbubble generating unit 2, the stirring device 34, the ultrasonic device 35, the pH detection device 44, and the dosing device 45.

[0058] In one embodiment of the present invention, the system operates under normal temperature and pressure conditions, and the specific working process is as follows:

[0059] 1. Nitrogen supply: The nitrogen output from the gas supply unit 1 enters the microbubble generating unit 2 through the pipeline. At the same time, the unreacted nitrogen returned from the ammonia collection unit 4 also enters the microbubble generating unit 2. After the two are mixed, they are converted into micron-sized nitrogen microbubbles.

[0060] 2. Ammonia production reaction: Nitrogen microbubbles are introduced into the bottom of the reaction vessel 31 through the inlet pipe 32, and pass from bottom to top through an aqueous suspension system containing hydrophobic fluoropolymer particles;

[0061] Under the synergistic effect of stirring device 34 and ultrasonic device 35, nitrogen microbubbles form sufficient gas-liquid-solid three-phase contact with water and hydrophobic fluoropolymer particles. Contact electro-reaction occurs at the three-phase interface, promoting the activation of nitrogen molecules and their reaction with water to generate ammonia.

[0062] 3. Ammonia absorption: The ammonia-containing gas generated by the reaction is discharged through the outlet pipe 33 and enters the bottom of the first absorption container 41 through the second inlet pipe 42. It passes through the absorption liquid from bottom to top, and most of the ammonia gas is absorbed by the absorption liquid. The gas that is not completely absorbed enters the second absorption container 41 for secondary absorption, which further improves the ammonia recovery rate.

[0063] 4. pH adjustment: The pH detection device 44 detects the pH value of the absorbent in real time and transmits the detection signal to the dosing device 45; the dosing device 45 automatically adjusts the dosing amount according to the detection result to maintain the pH value of the absorbent within the set weakly acidic range, ensuring the efficient and stable operation of the ammonia absorption process.

[0064] 5. Tail gas recirculation: Unreacted gas after two-stage absorption is discharged through exhaust pipe 43 and returned to microbubble generation unit 2 to participate in the ammonia production reaction again, realizing the recycling of nitrogen and improving the utilization rate of raw materials.

[0065] 6. Product collection: When the ammonia concentration in the absorbent reaches the set value, open the drain valve on the drain pipe 48 to discharge the ammonia-containing absorbent as a product for direct use in agricultural fertilization or further processing. Specific Implementation

[0066] This embodiment provides a room temperature and pressure contact-energized off-grid ammonia production and collection system. The reaction vessel 31 has a volume of 10L, and 10L of deionized water is added inside, along with 10g of polytetrafluoroethylene particles with a particle size of 25μm. The mixture is stirred to form a uniform aqueous suspension system.

[0067] The ammonia collection unit 4 is connected in series with two absorption containers 41, each with a volume of 5L. 3L of deionized water is added to each absorption container 41 as the absorption liquid.

[0068] A 0.5 mol / L phosphoric acid solution is added to the conditioning fluid storage bottle 46 as the conditioning fluid; the power supply unit 5 uses a combination of a 100W solar photovoltaic panel and a 12V / 100Ah lead-acid battery.

[0069] During system operation, the nitrogen output from the nitrogen cylinder is regulated to 0.1 MPa by a pressure reducing valve, and the gas flow rate is controlled at 1 L / min. After entering the microbubble generating unit 2 and being converted into micron-sized bubbles, the gas is introduced into the reaction vessel 31. The stirring device 34 is set to rotate at 300 rpm, and the ultrasonic device 35 operates at a frequency of 25 kHz. Both are turned on simultaneously to maintain uniform dispersion and full contact of the system.

[0070] The ammonia-containing gas generated during the reaction is sequentially absorbed into two absorption containers 41. A pH detection device 44 monitors the pH value of the absorption solution in real time. When the pH value is higher than 6.5, a dosing device 45 is activated, adding phosphoric acid adjusting solution to the absorption container 41 at a rate of 5 mL / min. Dosing stops when the pH value drops to 5.5. Unabsorbed nitrogen gas is recycled back to the microbubble generating unit 2 through an exhaust pipe 43.

[0071] After 24 hours of continuous operation, the concentration of ammonium nitrogen in the absorption liquid was measured to be 120 mg / L, with a cumulative production of 720 mg of ammonium nitrogen, and the nitrogen utilization rate reached 18.5%. The experimental results show that this system can stably achieve the preparation and collection of ammonia under normal temperature and pressure and off-grid power supply conditions, verifying the feasibility and effectiveness of the technical solution of this invention.

[0072] It should be noted that, in this invention, unless otherwise explicitly specified and limited, the terms "sliding," "rotating," "fixed," and "equipped" should be interpreted broadly. For example, they can refer to welded connections, bolted connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0073] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A normal temperature and pressure contact electrification type off-grid ammonia production and collection system, characterized in that, It includes a gas supply unit (1), a microbubble generating unit (2), a reaction unit (3), an ammonia collection unit (4), and an energy supply unit (5); The outlet of the gas supply unit (1) is connected to the inlet of the microbubble generating unit (2), the outlet of the microbubble generating unit (2) is connected to the inlet of the reaction unit (3), the outlet of the reaction unit (3) is connected to the inlet of the ammonia collecting unit (4), and the tail gas outlet of the ammonia collecting unit (4) is connected to the return inlet of the microbubble generating unit (2), forming a closed gas return path. The power supply unit (5) is electrically connected to the gas supply unit (1), the microbubble generating unit (2), the reaction unit (3) and the ammonia collection unit (4) respectively, and is used to provide operating power to each unit; The reaction unit (3) contains an aqueous suspension system containing hydrophobic fluoropolymer particles. The reaction unit (3) is also equipped with a stirring device (34) and an ultrasonic device (35). The stirring device (34) and the ultrasonic device (35) work together to enhance the contact between nitrogen microbubbles and the gas-liquid-solid three-phase interface of the aqueous suspension system, and realize nitrogen activation to produce ammonia by utilizing the contact electrostatic effect.

2. The ambient temperature and pressure contact electrification type off-grid ammonia production and collection system according to claim 1, characterized in that, The nitrogen source of the gas supply unit (1) is selected from any one of deoxygenated air, nitrogen generator or nitrogen cylinder; A shut-off valve, a pressure reducing valve, and a gas flow meter are sequentially installed on the pipeline between the gas supply unit (1) and the microbubble generating unit (2).

3. The ambient temperature and pressure contact electrification type off-grid ammonia production and collection system according to claim 1, characterized in that, The microbubble generating unit (2) is used to convert nitrogen into micron-sized bubbles with a particle size of 10-100 μm; The microbubble generating unit (2) is selected from any one of the Venturi type, porous aeration type or jet type microbubble generating devices.

4. The ambient temperature and pressure contact electrification type off-grid ammonia production and collection system according to claim 1, characterized in that, The reaction unit (3) also includes a sealed vertical reaction vessel (31), an inlet pipe (32), and an outlet pipe (33); One end of the air inlet pipe (32) is connected to the air outlet of the microbubble generating unit (2), and the other end extends into the bottom of the reaction vessel (31); One end of the outlet pipe (33) is connected to the top of the reaction vessel (31), and the other end is connected to the inlet of the ammonia collection unit (4). The stirring device (34) is installed on the top of the reaction vessel (31), and its stirring shaft extends into the interior of the water suspension system; The ultrasonic device (35) is installed on the side wall or bottom of the reaction vessel (31), and its ultrasonic emitting surface is in contact with the water suspension system.

5. The ambient temperature and pressure contact electrification type off-grid ammonia production and collection system according to claim 1, characterized in that, The ammonia collection unit (4) includes at least one absorption container (41), which contains an absorption liquid. The bottom of the absorption container (41) is provided with a drain pipe (48) for discharging the ammonia-containing absorption liquid product.

6. The ambient temperature and pressure contact-energized off-grid ammonia generation and collection system according to claim 5, characterized in that, The ammonia collection unit (4) includes two absorption containers (41) arranged in series; The top outlet of the first absorption container (41) is connected to the bottom inlet of the second absorption container (41), and the top outlet of the second absorption container (41) is connected to the return inlet of the microbubble generating unit (2).

7. The ambient temperature and pressure contact-energized off-grid ammonia generation and collection system according to claim 5, characterized in that, The ammonia collection unit (4) also includes a pH detection device (44), a dosing device (45), and a regulating liquid storage bottle (46); The detection end of the pH detection device (44) extends into the absorption liquid of the absorption container (41), and its signal output end is connected to the control end of the dosing device (45). The inlet of the dosing device (45) is connected to the outlet of the regulating liquid storage bottle (46) via the dosing pipe (47), and the outlet of the dosing device (45) is connected to the filling port of the absorption container (41) via the dosing pipe (47). The dosing device (45) adjusts the dosage according to the detection result of the pH detection device (44) to maintain the pH value of the absorbent in the range of 5.5-6.

5.

8. The ambient temperature and pressure contact-energized off-grid ammonia generation and collection system according to claim 7, characterized in that, The absorbent is selected from water or a solution containing a weakly acidic component; The conditioning solution stored in the conditioning solution storage bottle (46) is phosphoric acid or its corresponding weak acid salt solution.

9. The ambient temperature and pressure contact-energized off-grid ammonia generation and collection system according to claim 1, characterized in that, The energy supply unit (5) includes a combination of a solar power supply device and an energy storage device. The solar power supply device includes a solar photovoltaic panel, and the energy storage device includes a battery, a charge / discharge controller, and an inverter.

10. The ambient temperature and pressure contact-energized off-grid ammonia generation and collection system according to claim 1, characterized in that, The hydrophobic fluoropolymer particles are polytetrafluoroethylene particles.

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