Greenhouse production system integrating seawater desalination and farmland recarburization temperature control irrigation

Abstract

The invention belongs to the technical field of agricultural production, and discloses a greenhouse production system integrating seawater desalination and farmland recarburization temperature control irrigation, which is mainly used for relieving the fresh water pressure of agricultural production and optimizing the crop growth environment. The greenhouse production system comprises a seawater desalination module used for extracting seawater or saline water from a nearby water area, introducing carbon dioxide into a reaction kettle, and reacting to generate hydrate; the storage module is used for storing the hydrate generated by the seawater desalination module, separating the hydrate and fresh water and respectively storing the hydrate and fresh water; the irrigation module comprises an irrigation pipeline and a greenhouse and is mainly used for extracting the fresh water and hydrates in the storage module and outputting the fresh water and hydrates for irrigation; in addition, a power storage module and a control system assist the production system in operation. According to the greenhouse production system, by means of the decomposition characteristic of the carbon dioxide hydrate, recarburization, temperature control and irrigation of greenhouse production are integrated, full-working-condition self-adaptive control is achieved, the greenhouse production process is simplified, crop nutrient substance accumulation is facilitated, and the crop quality is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of agricultural production, and relates to a greenhouse production system integrating seawater desalination, farmland carbon increase and temperature control irrigation. BACKGROUND

[0002] With the continuous rise of global population and the public demand for fresh and high-quality crops, the scale of off-season vegetable planting is expanding, and the dependence on facility agriculture, especially farmland greenhouse, is increasing. The core of farmland greenhouse is to create and maintain a controllable microenvironment to meet the light, temperature, water, air and other conditions required for crop growth. However, the existing technology faces many key challenges in practical application, which restricts its effectiveness and sustainability, especially in high-temperature and arid areas, the strong demand for freshwater and heat preservation of farmland limits the development of related industries.

[0003] Firstly, the shortage of freshwater resources and low irrigation efficiency is a common bottleneck for sustainable agricultural development. Traditional agricultural irrigation consumes a large amount of valuable freshwater resources, especially in coastal or arid saline areas, the problem of freshwater supply shortage is more prominent. While crops grow vigorously in agricultural greenhouses, their water demand is often greater, and conventional irrigation systems often rely on external freshwater supply and complex pipeline equipment, which not only has high cost, but also has low water resource utilization rate, exacerbating the pressure on freshwater.

[0004] Secondly, in the sealed environment of the greenhouse, it is difficult to cooperatively control the gas composition and temperature in the greenhouse. Maintaining the airtightness of the greenhouse for temperature control leads to poor internal air circulation. The continuous consumption of carbon dioxide by photosynthesis of crops, combined with poor ventilation in the greenhouse, leads to a continuous decrease in carbon dioxide concentration, inhibiting photosynthetic efficiency and affecting greenhouse crop yield and quality. At the same time, in the strong light or high temperature season, the temperature in the shed is easily higher than the suitable range for crops, inducing pests and diseases. The existing cooling means (such as top ventilation) can reduce the temperature, but it will lose the heat and humidity in the shed, destroy the effect of the greenhouse, and cannot completely solve the problem of carbon dioxide deficiency. Traditional carbon dioxide gas fertilizer supplement and temperature control equipment usually operate independently, and the system is complex, energy-consuming and poorly coordinated.

[0005] Furthermore, the existing technical solutions are fragmented, have low integration, and are complex to operate. Current greenhouse environment management usually requires independent irrigation systems, carbon dioxide generation / supplement devices, and temperature control facilities (such as fans, wet curtains, sunshades, etc.). The purchase, installation, operation and maintenance costs of multiple sets of equipment are high, the operation process is complicated, there is a lack of organic linkage between the subsystems, it is difficult to achieve coordinated optimization control of environmental factors, and the management difficulty and operating cost are increased.

[0006] The carbon dioxide hydrate is a special substance, which is formed by the combination of carbon dioxide gas and water molecules under certain temperature and pressure, and is decomposed under normal temperature and pressure or low pressure to release gaseous carbon dioxide and pure fresh water. The characteristics provide a potential way to solve the above problems: the hydrate method can be used to treat salt water (such as seawater), and fresh water can be produced after decomposition, and the remaining low-temperature carbon dioxide can enter the greenhouse to supplement carbon dioxide and reduce temperature, at the same time, the heating sheet is installed in the gas pipeline to control the gas temperature synchronously, so as to realize the greenhouse temperature control function. How to efficiently utilize the formation, storage and decomposition characteristics of carbon dioxide hydrate, desalinate seawater (or saline water), increase carbon dioxide, regulate environmental temperature and integrate multiple key functions such as irrigation water supply into one, and build a simplified, efficient and low-cost greenhouse production system, become a technical problem to be solved.

[0007] Therefore, the present application aims at the defects of the traditional greenhouse production technology in farmland, and proposes a greenhouse production system integrating seawater desalination and carbon increase and temperature control irrigation in farmland by using carbon dioxide hydrate as a medium. SUMMARY

[0008] In view of the problems of large amount of fresh water resource, shortage of fresh water resource, easy decrease of carbon dioxide concentration, temperature control, irrigation, high production cost and complex system in the traditional greenhouse production process in farmland, the present application combines water desalination and hydrate technology, and discloses a greenhouse production system integrating seawater desalination and carbon increase and temperature control irrigation in farmland, which is used to solve the lack of fresh water resource for agricultural irrigation in some areas (especially coastal or saline areas), and establish an intelligent and easy-to-operate integrated greenhouse production system in farmland.

[0009] The technical scheme of the present application is as follows:

[0010] A greenhouse production system integrating seawater desalination and carbon increase and temperature control irrigation in farmland, comprising a seawater desalination module, a storage module, an irrigation module, a power storage module and a control system.

[0011] The seawater desalination module includes a carbon dioxide storage cylinder 1, a raw water storage tank 2, a reaction vessel 3, and a temperature control and circulation device 4, used to desalinate seawater or other brine. The carbon dioxide storage cylinder 1 is connected to the reaction vessel 3 to provide carbon dioxide for the reaction. The raw water storage tank 2 is used to store a mixture of external seawater or brine pumped by the second liquid pump 15 and fresh water pumped by the first liquid pump 14, along with a hydrate formation promoter. The raw water storage tank 2 is connected to the reaction vessel 3 to provide sufficient raw water for the reaction vessel 3. The reaction vessel 3 is the core of the seawater desalination module, used to maintain the reaction temperature and pressure, generate the required hydrates, and achieve seawater desalination. The outer shell of reactor 3 is equipped with an insulation jacket for maintaining the reaction temperature in a water bath. Reactor 3 is connected to carbon dioxide storage cylinder 1 and raw material water storage tank 2 to obtain raw material gas and raw material water. One end of it is connected to farmland greenhouse 9 through a pipeline to release the pressure inside the reactor and release excess carbon dioxide. It is connected to hydrate storage tank 5 below for subsequent separation and storage of hydrates. Its top cover can be opened to add hydrate formation promoter to reactor 3 and maintain a seal during hydrate formation. Temperature control circulation device 4 is connected to the jacket of reactor 3 to circulate refrigerant to maintain the temperature inside reactor 3.

[0012] The storage module includes a hydrate storage tank 5, a freshwater storage tank 6, a hydrate compactor 7, and a brine storage tank 8, used to separate and store hydrates and concentrated brine generated in the reactor 3, as well as freshwater generated from hydrate decomposition. The hydrate storage tank 5 is connected to the bottom of the hydrate compactor 7 and is used to store hydrate blocks generated by the compactor 7. The freshwater storage tank 6 is connected to the hydrate storage tank 5 and is used to store freshwater generated from the decomposition of hydrate blocks. The freshwater storage tank 6 is connected to the raw water storage tank 2 and is used to separate and recover freshwater and hydrate formation promoters. The reactor 3 is connected to the hydrate compactor 7 and is used to collect the hydrates generated in the reactor 3 and compact them into hydrate blocks. The brine storage tank 8 is connected to the bottom of the hydrate compactor 7 and is used to store concentrated brine generated during the operation of the reactor 3 and the hydrate compactor 7.

[0013] The irrigation module includes a farmland greenhouse 9 and an irrigation device 10, which is located inside the farmland greenhouse 9. The irrigation device 10 is connected to a freshwater storage tank 6 and is used to transport hydrates and freshwater to the ground for irrigation. The farmland greenhouse 9 is a normally operating greenhouse that meets the basic requirements for agricultural production and can control factors such as crop water evaporation and temperature.

[0014] The energy storage module includes a solar panel 11 and a battery 12, which are used to provide power to the entire greenhouse production system. The solar panel 11 provides power to the greenhouse production system during the day. The battery 12 is used to store excess energy from the solar panel 11 during the day and release it at night. The energy storage module is also connected to the external power grid to ensure power supply or storage in emergency situations.

[0015] The control system includes a monitoring module, a temperature control module, an emergency stop module, and a pipeline control module. Specifically, it includes a visual control console 13, liquid pumps, pressure reducing valves, control valves, temperature sensors, pressure sensors 23, a carbon dioxide concentration monitor 24, and a flow monitor 25. The visual control console 13 receives data from various sensors and monitors, macroscopically monitors and controls the opening and closing of various pumps and valves. The first liquid pump 14 is located on the connecting pipeline between the freshwater storage tank 6 and the raw water storage tank 2. The second liquid pump 15 is installed on the raw water storage tank 2 and the external water source pipeline, used to pump water from the outside. The system draws seawater or brine; a third pump 16 is installed on the connecting pipeline between the raw water storage tank 2 and the reactor 3 to pump raw water into the reactor 3; a fourth pump 17 is located on the connecting pipeline between the hydrate storage tank 5 and the fresh water storage tank 6 to pump the fresh water produced by the decomposition of hydrates in the hydrate storage tank 5 into the fresh water storage tank 6; a fifth pump 18 is installed on the connecting pipeline between the fresh water storage tank 6 and the irrigation equipment 10 to extract fresh water from the fresh water storage tank 6; and a sixth pump 26 is installed on the connecting pipeline between the hydrate compactor 7 and the brine storage tank 8 to draw water from the hydrate storage tank 6. The concentrated brine produced during the pressing process is extracted from the brine jacket of the pressurizer 7; the first pressure reducing valve 19 is installed on the connecting pipeline between the carbon dioxide storage cylinder 1 and the reactor 3, and is used to introduce high-pressure carbon dioxide into the reactor 3; the second pressure reducing valve 20 is located on the connecting pipeline between the reactor 3 and the farmland greenhouse 9, and is used to pump excess carbon dioxide from the reactor 3 to the farmland greenhouse 9 after the reaction, thereby releasing the pressure in the reactor 3; the control valve is located in the middle of each connecting pipeline, and is used to control the opening and closing of the transport pipeline; the first temperature sensor 21 and the carbon dioxide concentration monitor 24 are located inside the farmland greenhouse 9, and are used to monitor the temperature and carbon dioxide concentration changes inside the farmland greenhouse 9 in real time, so as to regulate the amount of carbon dioxide introduced; the second temperature sensor 22 and the pressure sensor 23 are placed inside the reactor 3, and are used to monitor the temperature and pressure inside the reactor 3 in real time, so as to control the amount of raw material water and carbon dioxide gas entering the reactor 3 and the reaction conditions inside the reactor, and ensure that the reaction is safe and complete; the flow monitor 25 is located on the connecting pipeline between the fresh water storage tank 6 and the farmland greenhouse 9, and is used to monitor the flow rate of irrigation fresh water and transmit the data to the visualization control console 13 for subsequent regulation.

[0016] All the aforementioned sensors together form a sensor network, which is connected to the controller (ECU) in the visualization console 13 to form a monitoring module. This highly integrated module monitors temperature and pressure in real time. The visualization console 13 is connected to the temperature control circulation device 4 to adjust the water bath temperature and circulation rate, thus forming a temperature control module. The liquid pump, pressure reducing valve, and control valve are all equipped with emergency stop switches, which are connected to the visualization console 13. These switches can stop the equipment in an emergency and disconnect the power supply if necessary. They are also equipped with manual switches, which can be operated electronically or manually. Together, they form an emergency stop module. Each liquid pump, pressure reducing valve, pipeline, and valve control switch together form a pipeline control system, which is all connected to the visualization console 13. These switches can be manually operated or directly controlled by the electronic switches of the visualization console 13, facilitating the connection and shutdown of various parts of the control device.

[0017] Specifically, the carbon dioxide storage cylinder 1 is made of high-pressure resistant material, and its internal pressure is usually around 10MPa. It is connected to the first pressure reducing valve 19 to provide sufficient high-pressure carbon dioxide to the reaction vessel 3.

[0018] The reactor 3 has a double-layer structure. The inner layer is made of pressure-resistant and high thermal conductivity material, and the outer layer is made of heat-insulating metal material. A circulating refrigerant is introduced in the middle. The top is connected to the carbon dioxide storage cylinder 1 and the raw material water storage tank 2 through a pressure reducing valve and a control valve, respectively. The raw materials are injected through the raw material water nozzle 28 and the raw material gas nozzle 29. A stirrer 30 is set in the middle to accelerate the reaction rate. The reactor 3 is connected to the hydrate pressure consolidator 7 through a control valve and a liquid pump. The reactor 3 is equipped with a pressure relief pipe connected to the farmland greenhouse 9 to discharge excess carbon dioxide. The reaction environment for the formation of hydrates is 4.0-6.0 MPa and 0-6℃. Preferably, an appropriate amount of hydrate formation promoter should be added before the reaction begins. The promoter should be a low-cost thermodynamic promoter (cyclopentane) and a bio-friendly kinetic promoter (amino acid). Depending on the reaction concentration and material requirements, it can also be added directly to the raw water storage tank 2 without opening the top cover of the reactor 3. One end of the upper part is connected to the carbon dioxide storage cylinder 1 through a pipe equipped with a first pressure reducing valve 19, and the other end is connected to the raw water storage tank 2 through a pipe equipped with a control valve and a liquid pump, which is used to provide high-pressure carbon dioxide gas and raw brine during the reaction. When the seawater desalination module is working, high-pressure carbon dioxide gas and raw water are injected from the raw water nozzle 28 and the raw gas nozzle 29 at the top of the reactor 3, and the reaction generates hydrate to achieve seawater desalination. There is a pipe above the reactor 3 connected to the top of the farmland greenhouse 9. After the reaction is completed, excess carbon dioxide can be introduced into the farmland greenhouse 9 by switching the second pressure reducing valve 20 to release the pressure inside the reactor 3. The other end is connected to the seventh liquid pump 27 through the hydrate slurry collection port 32 to introduce the hydrate slurry into the hydrate consolidator 7.

[0019] Specifically, the hydrate storage tank 5 has an opening in its side wall for directly receiving the hydrate blocks produced by the hydrate compactor 7. Its side wall has a built-in small heating element and temperature sensor, which are directly integrated into the temperature control module for real-time control of the tank temperature and the hydrate decomposition rate. Its container wall can be made of transparent or semi-transparent material. In areas with high temperature and strong sunlight, the hydrate decomposition can be promoted by directly exposing it to sunlight or by opening the lid to utilize ambient heat.

[0020] Specifically, the freshwater storage tank 6 is divided into upper and lower layers. The middle layer is designed as a removable structure, and the upper layer is equipped with a glass window for visual observation of the liquid level. Considering that the accelerator contains toxic oily components, after the freshwater entering through the hydrate storage tank 5 is allowed to settle, the oily accelerator will be above the liquid level, and the oil-water interface can be observed through the glass window. An open pipe is installed at an appropriate height and connected to the raw material water storage tank 2 through the first liquid pump 14 to extract the oil-water mixture above the freshwater and reuse the accelerator. When the middle layer is opened, the remaining pure freshwater enters the lower freshwater storage tank for subsequent irrigation. At the same time, the lower side wall has openings, through which supplementary freshwater can be introduced from the outside, or fertilizers can be added to assist irrigation. Heating elements can be installed on the pipe wall and integrated into the temperature control module, and covered with an insulation layer, so that the irrigation water can be heated in low-temperature environments to increase the temperature inside the greenhouse.

[0021] Specifically, the hydrate compactor 7 is a sandwich-type pressure-resistant cylindrical device, consisting of a hollow compaction zone, an inner wall, a brine jacket 34, and an outer wall from the inside out. The inlet is a funnel-shaped hydrate slurry injection structure 33, used to control the amount of hydrate entering the hydrate compactor 7. Sidewall filter holes 40 are installed on its sidewall to filter the reaction liquid directly into the brine jacket 34. The central compaction zone has a freely movable upper pressure head 35 and a lower pressure head 36, which are in close contact with the inner wall. A central column filter hole 38 is opened in the middle of the inner wall, and its holes can only allow hydrate particles and the remaining concentrated brine from the reaction to pass through. The brine jacket 34 is used to store the concentrated brine overflowing from the central hole and squeezed out. It has an opening at the bottom and is connected to the brine storage tank 8 through a pipe for extracting the brine from the jacket for subsequent storage and processing. After compaction, the hydrate block is pushed into the transport pipeline 39 by a push rod 37 on the side wall of the pipe below the hollow compaction zone.

[0022] Specifically, the brine storage tank 8 may be additionally equipped with an evaporation separation device for further processing of the concentrated brine in the tank, thereby obtaining additional freshwater resources and industrial salt at a lower cost, generating additional revenue, and reducing the operating cost of the device.

[0023] Specifically, a pipe insulation layer is installed in the middle of the pipe where the second pressure reducing valve 20 is located, and a heating element is installed inside. It is integrated into the temperature control module and directly connected to the visual control console 13. It can be powered on to heat the pipe, increase the temperature of the gas entering the farmland greenhouse 9, and realize temperature control operation in a low-temperature environment.

[0024] Beneficial effects of this invention:

[0025] This invention utilizes the hydrate method to achieve efficient seawater (saline water) desalination, fully leveraging the salt removal effect of hydrates to provide a stable irrigation water source and alleviate the pressure on freshwater use.

[0026] One of the core functions of the system is to directly utilize seawater or inland saline water as raw materials. By cleverly utilizing the formation and decomposition process of carbon dioxide hydrates, it achieves effective desalination of high-salinity water bodies; the freshwater produced after decomposition is directly used for irrigation of greenhouse crops, fundamentally solving the irrigation water problem for agricultural greenhouses in coastal, arid, and saline-alkali areas where freshwater is scarce. This significantly reduces dependence on traditional freshwater resources and external water transportation costs, providing a reliable water source guarantee for sustainable agricultural production.

[0027] Furthermore, this invention fully utilizes the hydrate reaction process to achieve integrated synergy of carbon enrichment, temperature control, and irrigation:

[0028] The core innovation of this system lies in its in-depth exploration of the unique physicochemical properties of carbon dioxide hydrate formation and decomposition. After hydrate formation, the high-pressure gas from the reactor enters the greenhouse, directly releasing high-concentration carbon dioxide gas into the sealed greenhouse space. This effectively replenishes the key raw materials needed for crop photosynthesis, significantly improving photosynthetic efficiency and promoting crop growth, yield, and quality. Simultaneously, the low-temperature carbon dioxide gas released from the reactor effectively absorbs heat from the greenhouse environment, achieving rapid and active cooling. This effectively alleviates heat stress in the greenhouse during high-temperature seasons or under strong sunlight, preventing pests and diseases. When used at night, its heat absorption and cooling effect effectively increases the diurnal temperature difference in the greenhouse, reducing nighttime respiration consumption by plants, which is conducive to nutrient accumulation and further improves the quality of agricultural products. In addition, the gas pipeline is covered with heating elements, which can simultaneously control the temperature of the carbon dioxide gas flow in low-temperature environments, enabling temperature control in low-temperature conditions.

[0029] Finally, this invention achieves highly integrated and intelligent unified dispatch and control:

[0030] The system highly integrates seawater desalination, hydrate generation / storage / decomposition, irrigation, and environmental monitoring and control within a unified greenhouse framework. It eliminates the cumbersome traditional greenhouse model that requires separate freshwater supply, carbon dioxide fertilization devices, and complex cooling equipment (fans, wet curtains, etc.). Simultaneously, based on real-time monitoring of greenhouse environmental parameters (such as temperature, carbon dioxide concentration, light intensity, and humidity), the central control system can intelligently decide the timing of hydrate generation and storage, as well as the rate and scale of decomposition and release. This enables coordinated response and precise on-demand supply of carbon dioxide, cooling, and irrigation needs, significantly simplifying the operational process. Furthermore, the system utilizes solar energy technology, alleviating electricity demand and allowing for independent operation as a standalone agricultural production module when power generation is sufficient. The highly integrated design significantly reduces the number of devices, installation complexity, energy consumption, and maintenance costs. Unified allocation and control reduce the difficulty of manual management, making the entire greenhouse environmental management more efficient, convenient, and economical.

[0031] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a greenhouse production system that integrates seawater desalination with carbon enrichment, temperature control, and irrigation of farmland.

[0033] Figure 2 This is a schematic diagram of the structure of the hydrate reaction vessel 3.

[0034] Figure 3 This is a schematic diagram of the hydrate compactor 7.

[0035] Figure 4 This is a schematic diagram of the stirrer in reactor 3.

[0036] Figure 5 This is a schematic diagram of the filter column structure in the middle of the hydrate compactor 7.

[0037] Figure 6 This is a flowchart illustrating the operation of the greenhouse production system described in this invention.

[0038] In the diagram: 1. Carbon dioxide storage cylinder; 2. Raw water storage tank; 3. Reactor; 4. Temperature control and circulation equipment; 5. Hydrate storage tank; 6. Fresh water storage tank; 7. Hydrate compactor; 8. Brine storage tank; 9. Farmland greenhouse; 10. Irrigation equipment; 11. Solar panel; 12. Battery; 13. Visual control console; 14. First liquid pump; 15. Second liquid pump; 16. Third liquid pump; 17. Fourth liquid pump; 18. Fifth liquid pump; 19. First pressure reducing valve; 20. Second pressure reducing valve; 21. First temperature sensor; 22. Second temperature sensor; 23. Pressure sensor; 24. Carbon dioxide concentration monitor; 25. Flow monitor; 26. Sixth liquid pump; 27. Seventh liquid pump; 28. Raw water nozzle; 29. ​​Raw gas nozzle; 30. Agitator; 31. Water bath jacket; 32. Hydrate slurry collection port; 33. Hydrate slurry injection structure; 34. Brine jacket; 35. Upper pressure head; 36. Lower pressure head; 37. Push rod; 38. Central column filter hole; 39. Transport pipeline; 40. Side wall filter hole. Detailed Implementation

[0039] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and technical solutions.

[0040] like Figure 1 The greenhouse production system shown is an integrated system combining seawater desalination and farmland carbon enrichment, temperature control, and irrigation. The components are connected as shown in the figure to achieve the construction of an integrated production system.

[0041] The integrated production system described in this invention mainly consists of four operating modes: shutdown, standby, operation, and cooling. During normal operation, it primarily operates in two modes: desalination and irrigation. These two modes cycle repeatedly, and the duration of each mode can be flexibly adjusted according to the usage environment and requirements. The characteristics and transitions between each mode are described in detail below, based on the aforementioned structure:

[0042] The shutdown condition refers to the complete cessation of the device's operation, operating at minimum or zero power consumption. This typically occurs during a complete shutdown of the production system, prolonged storage, or maintenance. Under this shutdown condition, the device is completely stopped, and all pumps and valves in the pipeline control module, including the first liquid pump 14, second liquid pump 15, third liquid pump 16, fourth liquid pump 17, fifth liquid pump 18, sixth liquid pump 26, seventh liquid pump 27, first pressure reducing valve 19, and second pressure reducing valve 20, are closed. The carbon dioxide storage cylinder 1 and its associated equipment are unloaded or shut off, completely isolating it from external carbon dioxide sources and eliminating internal gas and liquid flow. The farmland greenhouse 9 is not... When production activities are carried out or only manual irrigation mode is used, the main power supply system of the device is cut off, and only the basic functions of the monitoring module are maintained. The monitoring module can continue to perform leakage monitoring (when an independent power supply is configured). The emergency stop button is in the active lock state (physical or electronic lock). The temperature control module stops the heating / cooling cycle. No fluid flows through the water bath channel of reactor 3. Reactor 3, hydrate storage tank 5 and fresh water storage tank 6 are emptied and there is no liquid flow. This condition is triggered by the system shutdown command, manual shutdown or emergency stop. After receiving the start command, it switches to standby or working condition.

[0043] The standby mode is characterized by the device being powered on and having completed self-testing, with the main gas circuit valves still closed. However, the system is ready to quickly respond to the start-up command and enter the working state, with power consumption higher than in the shutdown state but significantly lower than in the working state. During the standby mode, all modules of the device are in a low-power pre-start state. The first pressure reducing valve 19 and the second pressure reducing valve 20 remain closed (allowing for trace pressure balance detection) to prevent gas leakage. The second liquid pump 15, the third liquid pump 16, the fourth liquid pump 17, the fifth liquid pump 18, the sixth liquid pump 26, and the seventh liquid pump 27 are in standby mode, and the valves in each part of the pipeline... The door is closed; the monitoring module is fully operational and continuously monitors the system's internal environmental parameters; the emergency stop button is reset and the actuator is powered on and ready to go; the temperature control module starts the preheating / precooling program, and the circulation system circulates the refrigerant into the water bath jacket 31 of the reactor 3 at low power; the remaining modules are in a silent standby state; this operating condition achieves rapid start-up response through preheating key components and real-time safety monitoring. It enters the standby state when the shutdown state receives a standby command or when the working state ends but is not completely closed. Upon receiving a start command, it switches to the working state; upon receiving a shutdown command or a fault trigger, it switches to the emergency stop state.

[0044] The cooling mode is a transitional mode when the device switches from operating mode to standby or shutdown mode. The device enters this mode after operation or when maintenance is required and the device is shut down for an extended period. Its purpose is to safely and controllably reduce the pressure of critical components (especially the high-pressure reactor 3, gas flow pipes, etc.) to a safe pressure (usually close to atmospheric pressure or standby pressure), avoiding airflow impact and preparing for the next startup or shutdown. The cooling mode achieves safe pressure release: the first pressure-reducing valve 19 closes, cutting off the gas supply; the second pressure-reducing valve 20 can be briefly opened to release residual gas before closing; the reactor 3 is cleaned of remaining hydrates and reaction liquid and then sealed; the temperature control module stops heating / cooling cycles and the water bath flow channel is emptied; the monitoring module focuses on monitoring the pressure drop curve and pressure limits; the storage module is emptied of hydrates and fresh water, and the remaining modules remain inactive. This mode prepares for shutdown after pressure release and is entered when the operating mode receives a stop command or requires active pressure release. After pressure release, it transitions to standby or shutdown mode. Its power consumption is lower than the operating mode but higher than shutdown / standby.

[0045] The operating condition refers to the normal operation of the device, where it performs its core functions such as seawater desalination, irrigation, pressurization, and temperature control, consuming the most power. This operating condition is derived from standby or cooling conditions, with all pumps and valves initially closed. The core functions of the operating condition are divided into two parts: desalination and irrigation, which cycle through each other. A detailed description follows:

[0046] Under the aforementioned desalination conditions, the seawater desalination module, storage module, and control system are in normal working order, providing sufficient fresh water and carbon dioxide for irrigation operations.

[0047] The workflow is described in detail below, and it mainly consists of the following steps:

[0048] The first step involves the temperature control module and circulation system operating at normal power, circulating refrigerant to maintain the reactor 3 at the required temperature for hydrate formation (typically 0-6℃). The second liquid pump 15 pre-extracts raw water from the outside into the raw water storage tank 2. A hydrate formation promoter is added to the reactor 3. The control valve of the raw water storage tank 2 and the third liquid pump 16 are opened, allowing raw brine / seawater to enter the reactor 3 and mix with the hydrate formation promoter. The mixture is closed once the required height or volume is reached. The first pressure reducing valve 19 is opened, allowing high-pressure carbon dioxide to be introduced into the reactor 3. The pressure is stopped once the specified pressure (typically 4.0-6.0 MPa) is reached. Both the internal temperature and pressure must be above the phase equilibrium curve for carbon dioxide hydrate formation and can be adjusted according to actual conditions and requirements. Simultaneously, the stirrer 30 inside the reactor 3 is turned on, and hydrate formation begins within the reactor 3.

[0049] In the second step, hydrate formation is completed in reactor 3. At this time, reactor 3 is still under high pressure and contains a large amount of hydrate slurry. The second pressure reducing valve 20 is opened, and high-pressure carbon dioxide is introduced into greenhouse 9. Reactor 3 is depressurized. The gas pipeline heating element is turned on and its power is determined according to actual needs. The seventh liquid pump 27 and hydrate slurry collection port 32 are opened, and the hydrate mixed reaction liquid enters the hydrate compactor. The excess reaction liquid (concentrated brine) enters the brine jacket 34 below through the filter hole 40 on the side wall of the hydrate compactor 7. The upper and lower pressure heads start working, and the hydrate compactor 7 starts running. It compacts the hydrate into a dense hydrate block. The squeezed-out excess brine enters the brine jacket 34 through the middle hole, and then enters the brine storage tank 8 through the sixth liquid pump 26. After compaction, the hydrate block enters the hydrate storage tank 5. Reactor 3 can carry out the next round of reaction cycle or enter the standby state.

[0050] Third, at this point, the hydrate storage tank 5 contains pure carbon dioxide hydrate. Depending on the local environment, the heating element can be turned on to increase the internal temperature of the hydrate storage tank 5 and promote the decomposition of the hydrate. If the external temperature is high, the hydrate storage tank can be placed directly in the external environment for natural decomposition. Thus, the hydrate decomposes rapidly in the hydrate storage tank 5, producing fresh water.

[0051] At this point, the desalination process is complete. During this process, the above steps can be repeated multiple times to provide sufficient hydrate raw materials for subsequent irrigation processes.

[0052] Under the irrigation conditions, the irrigation module, storage module, and control system are in normal working order, used to promote the decomposition of hydrates to produce fresh water, providing sufficient irrigation water for the farmland greenhouse 9.

[0053] The workflow is described in detail below, and it mainly consists of the following steps:

[0054] In the first step, the fourth liquid pump 17 starts working, drawing fresh water produced by the decomposition of hydrates in the hydrate storage tank 5 into the upper part of the fresh water storage tank 6. After settling and stratification, the first liquid pump 14 starts working, drawing the fresh water and the oil-water mixture of hydrate formation promoter into the raw water storage tank 2 for reuse. After completion, the middle layer drawer is opened, and the fresh water enters the lower layer for storage. The opening on the lower side wall of the fresh water storage tank 6 connects to the outside, allowing for the extraction or injection of fresh water, as well as the addition of fertilizers to assist irrigation, etc.

[0055] In the second step, the fifth liquid pump 18 is turned on to draw fresh water stored in the lower layer of the fresh water storage tank to the irrigation equipment 10 in the farmland greenhouse 9 for irrigation operation; in particular, the irrigation equipment 10 adopts drip irrigation in order to save irrigation water.

[0056] The third step involves dynamically adjusting the reaction time and rate of the reactor, as well as the depressurization time and rate of the reactor, based on data such as temperature, pressure, and carbon dioxide concentration returned by the sensor network inside the farmland greenhouse 9. Simultaneously, the switching and power of the heating element in the middle of the gas pipeline from the reactor to the greenhouse can be controlled according to temperature requirements. At the same time, a heater can be introduced into the lower part of the freshwater storage tank 6 to appropriately heat the irrigation water source, thereby achieving dynamic adjustment of the greenhouse temperature and controlling the carbon dioxide concentration and ambient temperature inside the farmland greenhouse 9.

[0057] Fourth, when the sensor detects that the carbon dioxide concentration in the farmland greenhouse 9 is too high, the pressure release of the reactor 3 can no longer be carried out, the seawater desalination module stops operating and enters standby mode, at which time only irrigation operation is performed; when the freshwater storage tank 6 is insufficient, freshwater can be directly introduced from the outside for irrigation, at which time the seawater desalination module is not activated, and only the freshwater storage tank 6, the fifth liquid pump 18 and the irrigation equipment 10 are used to achieve general farmland irrigation operation.

[0058] In particular, when it is not necessary to decompose hydrates to produce fresh water for irrigation, the seawater desalination module can be omitted, and general farmland irrigation operations can be achieved using only the freshwater storage tank 6, the fifth liquid pump 18, and the irrigation equipment 10.

[0059] At this point, the irrigation process is complete. During this process, the above steps can be repeated multiple times to provide a stable and suitable growing environment for greenhouse crops. In addition, this module can also be used at night, which can effectively reduce the greenhouse temperature, increase the diurnal temperature range, reduce the nighttime cellular respiration of plants, and promote the accumulation of nutrients in vegetables, thereby improving vegetable quality.

[0060] Under operating conditions, the monitoring module analyzes temperature / pressure / flow data in real time and triggers over-limit protection. This operating condition is entered from the standby condition upon receiving a start command, and switches to the cooling condition upon receiving a stop command or when a fault is triggered.

[0061] Specifically, the working process of the hydrate compactor 7 is as follows:

[0062] After the reaction in the reactor 3 is completed, the contents of the reactor are hydrate slurry. The hydrate slurry is collected in the hydrate slurry collection port 32 and then enters the hydrate compactor. Most of the reaction liquid enters the brine jacket 34 through the side wall filter holes 40. The hydrate slurry is then lifted by the upper pressure head 35 and compressed in the middle column. The upper and lower pressure heads slowly squeeze towards the middle, and the squeezed reaction liquid enters the brine jacket 34 through the middle hole. It is then pumped into the brine storage tank 8 for storage. The hydrate is squeezed by the upper and lower pressure heads at the middle hole, and the excess brine is squeezed out and enters the jacket through the middle hole, thereby improving the salt removal rate of the hydrate. After the hydrate is compacted in the middle, it becomes a dense hydrate cylindrical block. After the lower pressure head 36 descends to the designated height, the side push rod 37 is activated, pushing the hydrate into the transport pipe 39 and sliding into the hydrate storage tank 5 for storage and decomposition.

[0063] Specifically, the carbon dioxide concentration in farmland greenhouse 9 should be controlled at no less than 200 ppm and no more than 2000 ppm, with 900-1100 ppm being the optimal range; the nighttime temperature in farmland greenhouse 9 should be controlled at 10-20℃ and the daytime temperature should be controlled at 20-35℃.

Claims

1. A greenhouse production system integrating seawater desalination and farmland carbonation temperature control irrigation, characterized in that, The greenhouse production system comprises a seawater desalination module, a storage module, an irrigation module, an electricity storage module and a control system; The seawater desalination module comprises a carbon dioxide storage cylinder (1), a raw water storage tank (2), a reaction kettle (3) and a temperature control circulation device (4); the carbon dioxide storage cylinder (1) is connected with the reaction kettle (3) to provide carbon dioxide for the reaction; the raw water storage tank (2) is used for storing seawater or brine extracted by a second liquid pump (15), fresh water extracted by a first liquid pump (14) and a hydrate generation promoter; the raw water storage tank (2) is connected with the reaction kettle (3) to provide sufficient raw water for the reaction kettle (3); the reaction kettle (3) is used for maintaining the reaction temperature and pressure and generating the required hydrate; the temperature control circulation device (4) is connected with the interlayer of the reaction kettle (3) and is used for circulating the refrigerant to maintain the temperature in the reaction kettle (3); The storage module comprises a hydrate storage tank (5), a fresh water storage tank (6), a hydrate presser (7) and a brine storage tank (8); the hydrate storage tank (5) is connected with the bottom of the hydrate presser (7) and is used for storing the hydrate blocks generated by the hydrate presser (7); the fresh water storage tank (6) is connected with the hydrate storage tank (5) and is used for storing the fresh water generated by the decomposition of the hydrate blocks; the fresh water storage tank (6) is connected with the raw water storage tank (2) and is used for separating and recovering the fresh water and the hydrate generation promoter; the reaction kettle (3) is connected with the hydrate presser (7) and is used for collecting the hydrate generated in the reaction kettle (3) and pressing the hydrate into hydrate blocks; the brine storage tank (8) is connected with the bottom of the hydrate presser (7) and is used for storing the concentrated brine generated in the working process of the reaction kettle (3) and the hydrate presser (7); The irrigation module comprises a farmland greenhouse (9) and an irrigation device (10), and the irrigation device (10) is located in the farmland greenhouse (9); the irrigation device (10) is connected with the fresh water storage tank (6) and is used for delivering the hydrate and the fresh water to the ground to implement irrigation; The electricity storage module comprises a solar panel (11) and a storage battery (12) and is used for providing the power supply for the entire greenhouse production system; the solar panel (11) provides the power supply for the greenhouse production system during the day; the storage battery (12) is used for storing the excess power of the solar panel (11) during the day and releasing the power at night; the electricity storage module is simultaneously connected with an external power grid and is used for ensuring the power supply or storage in an emergency; The control system comprises a monitoring module, a temperature control module, an emergency stop module and a pipeline control module and specifically comprises a visual control console (13), a liquid pump, a pressure reducing valve, a control valve, a temperature sensor, a pressure sensor (23), a carbon dioxide concentration monitor (24) and a flow monitor (25).

2. The greenhouse production system according to claim 1, characterized in that, The control system includes a visual control console (13) for receiving data from various sensors and monitors, macro-monitoring and controlling the opening and closing of various pumps and valves, etc.; a first liquid pump (14) is installed on the connecting pipeline between the fresh water storage tank (6) and the raw water storage tank (2); a second liquid pump (15) is installed on the connecting pipeline between the raw water storage tank (2) and the external water source pipeline, for extracting seawater or brine from the outside world; a third liquid pump (16) is installed on the connecting pipeline between the raw water storage tank (2) and the reaction kettle (3), for pumping raw water into the reaction kettle (3); a fourth liquid pump (17) is installed on the connecting pipeline between the hydrate storage tank (5) and the fresh water storage tank (6), for pumping the fresh water produced by the decomposition of hydrates in the hydrate storage tank (5) into the fresh water storage tank (6); a fifth liquid pump (18) is installed on the connecting pipeline between the fresh water storage tank (6) and the irrigation equipment (10), for pumping fresh water from the fresh water storage tank (6); a sixth liquid pump (26) is installed on the connecting pipeline between the hydrate pressurization device (7) and the brine storage tank (8), for pumping the concentrated brine produced by the pressurization from the saltwater interlayer of the hydrate pressurization device (7); a first pressure reducing valve (19) is installed on the connecting pipeline between the carbon dioxide storage cylinder (1) and the reaction kettle (3), for pumping high-pressure carbon dioxide into the reaction kettle (3); a second pressure reducing valve (20) is installed on the connecting pipeline between the reaction kettle (3) and the farmland greenhouse (9), for pumping the excess carbon dioxide in the reaction kettle (3) after the reaction into the farmland greenhouse (9) to release the pressure in the reaction kettle (3); control valves are installed in the middle of the connecting pipelines, for controlling the opening and closing of the pipelines; a first temperature sensor (21) and a carbon dioxide concentration monitor (24) are installed in the farmland greenhouse (9), for monitoring the temperature and carbon dioxide concentration in the farmland greenhouse (9) in real time, so as to control the amount of carbon dioxide pumped in; a second temperature sensor (22) and a pressure sensor (23) are installed inside the reaction kettle (3), for monitoring the temperature and pressure inside the reaction kettle (3) in real time, so as to control the amount of raw water and carbon dioxide gas entering the reaction kettle (3) and the reaction conditions in the kettle, to ensure the safety and sufficiency of the reaction; a flow monitor (25) is installed on the connecting pipeline between the fresh water storage tank (6) and the farmland greenhouse (9), for monitoring the flow of the fresh water for irrigation and transmitting the data to the visual control console (13) for subsequent control.

3. The greenhouse production system of claim 1, wherein, The reaction kettle (3) has a double-layer structure, the inner layer is made of pressure-resistant high-thermal-conductivity material, the outer layer is made of heat-insulating metal material, and a circulating refrigerant is circulated in the middle; the top is connected to the carbon dioxide storage cylinder (1) and the raw water storage tank (2) through pressure reducing valves and control valves, and the reaction raw materials are injected through nozzles; a stirrer (30) is arranged in the middle, for accelerating the reaction rate; the reaction kettle (3) is connected to the hydrate pressurization device (7) through control valves and liquid pumps; the reaction kettle (3) is provided with a pressure release pipeline connected to the farmland greenhouse (9), for discharging excess carbon dioxide; and the reaction environment for generating hydrates is 4.0-6.0 MPa and 0-6℃.

4. The greenhouse production system of claim 1, wherein, The hydrate press solidifier (7) is a sandwich pressure-resistant cylindrical device, which comprises a hollow press solidification zone, an inner wall, a salt water sandwich (34), and an outer wall from inside to outside; the inlet is a funnel-shaped hydrate slurry injection structure (33) for controlling the amount of hydrate entering the hydrate press solidifier (7), and a side wall filter screen (40) is installed on the side wall to filter the reaction liquid directly into the salt water sandwich (34); the central press solidification zone has a freely movable upper press head (35) and a lower press head (36) which are in close contact with the inner wall; a central column filter hole (38) is opened in the middle of the inner wall, and only hydrate particles and the remaining concentrated salt water can pass through the hole; the salt water sandwich (34) is used to store the concentrated salt water overflowing from the middle hole and squeezed out, and the bottom is opened and connected to the salt water storage tank (8) through a pipeline for extracting the salt water in the sandwich for subsequent storage and processing; the hydrate block after the completion of the press solidification is pushed into the transportation pipeline (39) by the push rod (37) on the side wall of the pipeline below the hollow press solidification zone.

5. The greenhouse production system of claim 1, wherein, The carbon dioxide concentration in the farmland greenhouse (9) needs to be controlled to be not less than 200 ppm and not more than 2000 ppm; the night temperature in the farmland greenhouse (9) needs to be controlled at 10-20℃, and the daytime temperature needs to be controlled at 20-35℃.

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