Carbon dioxide gas supply device

Abstract

The application discloses a carbon dioxide gas supply device, which comprises a gas conveying pipeline, wherein an electric cut-off valve, a double reboiler, a self-operated pressure reducing valve, a flow meter and a gas volume regulating valve are sequentially arranged on the gas conveying pipeline along the gas flow direction; the electric cut-off valve is used for cutting off the gas phase pipeline in the intermittent carbon dioxide gas supply stop working condition; and the double reboiler is provided with an electric heating assembly and a hot water circulating assembly. The application effectively avoids the ice blockage problem caused by the intermittent carbon dioxide gas supply, reduces the energy consumption during winter operation, ensures the stability of the gas supply temperature and pressure, realizes the accurate metering and automatic adjustment of the flow, and improves the safety, economy and intelligent level of the gas supply system.

Description

Technical Field

[0001] This invention relates to the technical field of modern smart agriculture, and in particular to a carbon dioxide supply device. Background Technology

[0002] In modern smart agriculture, liquid carbon dioxide is typically vaporized and piped into intelligent greenhouses to increase the carbon dioxide concentration and promote plant growth. Existing gas supply systems generally consist of outdoor cryogenic storage tanks, ambient air vaporizers, and indoor reheating, pressure regulating, and metering facilities. Among these, the reheating, pressure regulating, and metering facilities are the core component determining the safety and stability of the gas supply; however, existing facilities have many shortcomings in actual operation.

[0003] First, conventional reheaters rely solely on electric heating, resulting in excessively high electricity consumption to maintain gas temperature during periods of significant temperature fluctuations in winter, leading to a substantial increase in operating costs. Second, if the reheater relies solely on boiler circulating hot water for heating, the system will completely lose its heat source and be unable to supply gas normally when the boiler is shut down for seasonal reasons or maintenance. Furthermore, since smart agriculture greenhouses often operate on an intermittent pattern of daytime gas supply and nighttime shutdown, the pipelines are prone to dry ice formation due to throttling expansion during restart, causing pipe blockage and severely hindering timely gas supply. In addition, existing devices suffer from unstable gas supply pressure, poor flow regulation accuracy, and often require gas supply interruption during equipment maintenance, making on-site debugging inconvenient and posing significant safety hazards. Moreover, the single control method fails to meet the dual requirements of remote centralized management and on-site emergency operation. Summary of the Invention

[0004] In view of the aforementioned problems with existing technologies, the present invention aims to provide a carbon dioxide supply device.

[0005] The specific technical solution is as follows: A carbon dioxide supply device includes: a gas delivery pipeline, wherein an electric shut-off valve, a dual superheater, a self-regulating pressure reducing valve, a flow meter, and a gas volume regulating valve are sequentially arranged along the gas flow direction on the gas delivery pipeline; the electric shut-off valve is used to cut off the gas phase pipeline when the carbon dioxide intermittent gas supply is stopped; the dual superheater is provided with an electric heating component and a hot water circulation component.

[0006] Furthermore, in a preferred embodiment, the electric shut-off valve is installed on the downstream gas phase pipeline of the liquid carbon dioxide vaporizer. When the gas supply is stopped, the electric shut-off valve closes, and the vaporization medium in the upstream pipeline of the vaporizer pushes the liquid carbon dioxide back into the storage tank to maintain the pressure balance of the upstream pipeline.

[0007] Furthermore, in a preferred embodiment, the electric heating component of the dual reheater is an electric heater disposed within the heat exchange water jacket, and the hot water circulation component includes a hot water inlet pipe and a hot water return pipe connected to the heat exchange water jacket. A circulating hot water pump is provided on the hot water return pipe, and a hot water regulating valve is provided on the hot water inlet pipe.

[0008] Furthermore, in a preferred embodiment, the hot water regulating valve is interlocked with the temperature detection device at the gas outlet of the dual reheater, and the hot water regulating valve is configured to automatically adjust its opening degree according to the temperature of the gas at the outlet of the dual reheater; the electric heater is interlocked with the temperature detection device, and the electric heater is configured to automatically adjust its heating power according to the temperature of the outlet gas.

[0009] Furthermore, in a preferred embodiment, the filter is located upstream of the flow meter, and the self-regulating pressure reducing valve is located downstream of the flow meter; the flow meter is interlocked with the gas flow regulating valve, and the gas flow regulating valve is configured to automatically adjust its opening degree according to the detection signal of the flow meter.

[0010] Furthermore, as a preferred embodiment, it also includes a bypass pipeline, the two ends of which are respectively connected to the upstream pipeline of the self-regulating pressure reducing valve and the downstream pipeline of the gas volume regulating valve, and two manual throttle valves are connected in series on the bypass pipeline.

[0011] Furthermore, as a preferred embodiment, safety valves are provided at multiple pressure change points in the gas delivery pipeline, and maintenance valves are provided at the inlet of each safety valve. Manual venting valves are provided on the pipeline where each safety valve is located. The discharge ports of each safety valve are all connected to the same venting manifold, which is connected to the outside.

[0012] Furthermore, as a preferred embodiment, the maintenance valve is a ball valve, and the vent manifold is a vertically arranged high-altitude discharge pipe.

[0013] Furthermore, in a preferred embodiment, the gas delivery pipeline is provided with multiple detection components, including a mechanical pressure gauge, a mechanical thermometer, and a pressure transmitter and a temperature transmitter corresponding to the pressure gauge and the thermometer, the pressure transmitter and the temperature transmitter being used to output signals to a remote control system.

[0014] Furthermore, as a preferred embodiment, the air volume regulating valve is an electric valve or a pneumatic valve, and is equipped with a manual operation handwheel, configured to have two operation modes: remote automatic control and local manual control.

[0015] The positive effects of the above technical solution compared with the existing technology are: This invention, by installing an electrically operated shut-off valve on the downstream gas phase pipeline of the vaporizer, can effectively push liquid carbon dioxide back into the storage tank when the gas supply stops, maintaining upstream pressure balance and preventing throttling expansion and dry ice blockage when the valve reopens. The dual reheater has both electric heating and hot water circulation heating functions, which can make full use of hot water to reduce power consumption when the boiler is running, and can also activate the backup heating source to ensure continuous gas supply when the boiler is shut down. Through the sequential series cooperation of the filter, flow meter, self-regulating pressure reducing valve and gas volume regulating valve, a complete control chain is realized, which first filters impurities, then accurately measures, and finally stabilizes pressure reduction and regulates flow, ensuring both measurement accuracy and improving gas supply quality and safety. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a carbon dioxide supply device according to the present invention; In the attached diagram: 1. Pressure gauge; 2. Thermometer; 3. Pressure transmitter; 4. Temperature transmitter; 5. Inspection valve; 6. Safety valve; 7. Vent valve; 8. Electric shut-off valve; 9. Circulating hot water pump; 10. Hot water regulating valve; 11. Dual reheater; 12. Electric heater; 13. Manual shut-off valve; 14. Manual throttle valve; 15. Filter; 16. Flow meter; 17. Self-regulating pressure reducing valve; 18. Gas flow regulating valve. Detailed Implementation

[0017] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0018] In the description of this invention, it should be noted that terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] Figure 1 This is a schematic diagram of the structure of a carbon dioxide supply device according to the present invention, as shown below. Figure 1 The diagram illustrates a preferred embodiment of a carbon dioxide supply device, comprising: a gas delivery pipeline, on which an electric shut-off valve 8, a dual reheater 11, a self-regulating pressure reducing valve 17, a flow meter 16, and a gas flow regulating valve 18 are sequentially arranged along the gas flow direction; the electric shut-off valve 8 is used to cut off the gas phase pipeline during intermittent carbon dioxide supply shutdown; the dual reheater 11 is equipped with an electric heating component and a hot water circulation component. When the device is started, the carbon dioxide gas from the vaporizer first passes through the electric shut-off valve 8, then enters the dual reheater 11 for heating. The heated gas then undergoes filtration, metering, pressure reduction, and flow regulation before finally being delivered to the intelligent greenhouse. The principle is as follows: the electric shut-off valve 8 controls the pipeline's on / off state during start-up and shutdown, and by rationally arranging it in the gas phase pipeline, it can fundamentally prevent the generation of dry ice; the dual reheater 11 utilizes a dual heat source redundancy design to ensure sufficient heat source under any operating conditions to maintain the gas outlet temperature; the filter 15 effectively intercepts residual impurities in the pipeline, protecting downstream precision instruments. This embodiment can effectively solve multiple problems in the prior art, such as high energy consumption costs, single heat source, easy ice blockage during start-up and shutdown, and unstable gas supply quality.

[0021] Furthermore, as a preferred embodiment, the electrically operated shut-off valve 8 is installed on the downstream gas phase pipeline of the liquid carbon dioxide vaporizer. When the gas supply is stopped, the electrically operated shut-off valve 8 closes, and the vaporization medium in the upstream pipeline of the vaporizer pushes the liquid carbon dioxide back to the storage tank to maintain the pressure balance of the upstream pipeline. When the system performs a nighttime shutdown operation, the valve closes, cutting off the downstream gas phase flow path; at this time, the residual liquid carbon dioxide in the upstream pipeline of the vaporizer continues to vaporize, and the pressure of the vaporized medium pushes the liquid carbon dioxide in the upstream pipeline back to the cryogenic liquid storage tank. Since the storage tank is equipped with a pressure regulating valve, the pressure in the upstream pipeline always remains balanced with the storage tank, and there will be no significant pressure drop. Specifically, when the electrically operated shut-off valve 8 is opened again the next day, the pressure difference before and after the valve is minimal, and the medium in the pipeline remains in a gas phase state. There is no drastic pressure drop, vaporization, and expansion caused by the liquid phase passing through the throttling valve, thus avoiding the problem of ice blockage caused by dry ice generated due to heat absorption and rapid cooling at the source.

[0022] Furthermore, in a preferred embodiment, the electric heating component of the dual-reheater 11 is an electric heater 12 installed inside the heat exchange water jacket. The hot water circulation component includes a hot water inlet pipe and a hot water return pipe connected to the heat exchange water jacket. A circulating hot water pump 9 is installed on the hot water return pipe, and a hot water regulating valve 10 is installed on the hot water inlet pipe. In hot water circulation mode, the circulating hot water pump 9 drives hot water to perform forced convection heat exchange between the heat exchange water jacket and the external boiler. This structure can start the circulating hot water pump 9 and use hot water circulation as the main heat source when there is a large heat load in winter, avoiding the high energy consumption of high-power electric heating. At the same time, the hot water regulating valve 10 dynamically adjusts the hot water flow rate according to the gas outlet temperature to ensure heat exchange efficiency.

[0023] Even better, a manual switching valve 13 is also installed on the downstream pipeline of the dual reheater 11. Furthermore, in a preferred embodiment, the hot water regulating valve 10 is interlocked with a temperature detection device at the gas outlet of the dual superheater 11. The hot water regulating valve 10 is configured to automatically adjust its opening based on the temperature of the gas outlet from the dual superheater 11. The electric heater 12 is also interlocked with the temperature detection device, and is configured to automatically adjust its heating power based on the temperature of the outlet gas. When the detected outlet gas temperature is lower than a set value, the hot water regulating valve 10 automatically increases its opening to increase the hot water flow; conversely, it decreases its opening. Simultaneously, the electric heater 12 is also interlocked with the same temperature detection device. When the hot water regulating valve 10 is at its maximum opening but the outlet temperature is still insufficient, or when the boiler is shut down and hot water circulation cannot be activated, the electric heater 12 automatically outputs power, adjusting the heating output power according to the temperature difference. The technical principle is that through automated closed-loop control, inexpensive hot water is prioritized, and electric heating is used for supplementary heating and substitution when insufficient. Its beneficial effects are that it ensures a constant gas outlet temperature, minimizes system operating costs, and improves the adaptability of the equipment in different environments.

[0024] Furthermore, in a preferred embodiment, the filter 15 is located upstream of the flow meter 16, and the self-regulating pressure reducing valve 17 is located downstream of the flow meter 16. The flow meter 16 is interlocked with the gas flow regulating valve 18, which is configured to automatically adjust its opening based on the detection signal from the flow meter 16. The filter 15, located upstream of the flow meter 16, intercepts solid impurities that may be carried in the carbon dioxide gas, ensuring that the flow meter 16 is not subject to wear and blockage. The self-regulating pressure reducing valve 17, located downstream of the flow meter 16, stabilizes and reduces the pressure of the metered carbon dioxide gas, providing a constant and suitable pressure differential for the subsequent gas flow regulating valve 18. The flow meter 16 continuously detects the instantaneous and cumulative flow of the gas and transmits the signal to the control unit. The gas flow regulating valve 18 automatically adjusts its opening based on this signal. The beneficial effect is that the "filter first, then meter, then pressure reduce" layout effectively ensures the working accuracy and service life of the flow meter 16, while ensuring that the regulating valve operates accurately under a stable pressure differential, achieving precise quantitative control of the gas supply to the intelligent greenhouse.

[0025] Furthermore, as a preferred embodiment, a bypass pipeline is also included. The two ends of the bypass pipeline are connected to the upstream pipeline of the self-regulating pressure reducing valve 17 and the downstream pipeline of the gas flow regulating valve 18, respectively. Two manual throttle valves 14 are connected in series on the bypass pipeline. This embodiment includes an emergency bypass circuit. The inlet end of the bypass pipeline is connected to the pipeline upstream of the self-regulating pressure reducing valve 17, and its outlet end is connected to the pipeline downstream of the gas flow regulating valve 18, thus replacing the pressure reducing valve, flow meter 16, and gas flow regulating valve 18 in the main circuit with the parallel structure of the bypass pipeline. Two manual throttle valves 14 are connected in series on the bypass pipeline. Its technical principle and beneficial effects are: when the flow meter 16 or gas flow regulating valve 18 in the main circuit malfunctions and requires maintenance, personnel can immediately switch to the bypass branch without stopping the gas supply, and manually adjust the gas pressure and flow rate through the two connected manual throttle valves 14 to temporarily maintain gas supply to the greenhouse, ensuring that agricultural production is not affected, and significantly improving the safety and convenience of on-site maintenance.

[0026] Furthermore, in a preferred embodiment, safety valves 6 are installed at multiple pressure change points in the gas delivery pipeline. Each safety valve 6 has a maintenance valve 5 at its inlet, and a manual vent valve 7 is installed on the pipeline containing each safety valve 6. The outlets of all safety valves 6 are connected to the same vent manifold, which extends outdoors. The maintenance valve 5 is a ball valve, and the vent manifold is a vertically arranged high-altitude discharge pipe. Safety valves 6 are installed at multiple locations in the gas delivery pipeline where pressure changes may occur. To facilitate periodic inspection and maintenance of the safety valves 6, a maintenance valve 5 is provided at the inlet of each safety valve 6. Simultaneously, a manual vent valve 7 is installed on the pipeline containing each safety valve 6 for depressurization before system commissioning or maintenance. More importantly, the outlets of all safety valves 6 are connected to the same vent manifold, which extends vertically upwards from the factory or greenhouse, connecting to the outdoor high altitude. Its beneficial effects are: by setting up safety valves 6 at multiple points, comprehensive protection is achieved for all pressure change points in the pipeline; the high-altitude venting method prevents high-pressure carbon dioxide gas from directly splashing onto the operating platform when safety valve 6 trips, and prevents the released inert gas from accumulating in low-lying areas and posing a suffocation risk to nearby workers, effectively ensuring personal safety. Furthermore, the configuration of inspection valve 5 and vent valve 7 makes annual equipment inspections and routine maintenance more convenient and safer. Furthermore, as a preferred embodiment, the gas delivery pipeline is equipped with multiple detection components, including a mechanical pressure gauge 1, a mechanical thermometer 2, and pressure transmitters 3 and temperature transmitters 4 corresponding to the pressure gauge 1 and thermometer 2. The pressure transmitters 3 and 4 are used to output signals to the remote control system. The gas flow regulating valve 18 is an electric or pneumatic valve with a manual operation handwheel, configured to have both remote automatic control and local manual control operation modes. Multiple sets of detection components are installed on the gas delivery pipeline, each set including a mechanical pressure gauge 1 and a mechanical thermometer 2, allowing on-site inspectors to intuitively read real-time data without relying on a control terminal. Simultaneously, to meet remote monitoring requirements, each mechanical gauge is also equipped with a pressure transmitter 3 and a temperature transmitter 4, converting the measured analog quantity into a digital signal and transmitting it to the central PLC control system. The gas flow regulating valve 18 is preferably an electric or pneumatic valve with a mechanical handwheel. Its technical principle lies in integrating local instruments and remote transmitters, utilizing the logic algorithms of the control system to achieve automatic regulation of flow and pressure. Its beneficial effects are: the device not only possesses the reliability of "local instrument display + local handwheel operation," but also the intelligent functions of "remote transmission + remote automatic adjustment," offering flexible operation modes and greatly facilitating the automated management and maintenance of smart agriculture.

[0027] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A carbon dioxide supply device, characterized in that, include: The system includes a gas delivery pipeline, on which an electric shut-off valve, a dual superheater, a self-regulating pressure reducing valve, a flow meter, and a gas volume regulating valve are sequentially arranged along the gas flow direction. The electric shut-off valve is used to cut off the gas phase pipeline when the carbon dioxide intermittent gas supply is stopped. The dual superheater is equipped with an electric heating component and a hot water circulation component.

2. The carbon dioxide supply device according to claim 1, characterized in that, The electric shut-off valve is installed on the downstream gas phase pipeline of the liquid carbon dioxide vaporizer. When the gas supply stops, the electric shut-off valve closes, and the vaporization medium in the upstream pipeline of the vaporizer pushes the liquid carbon dioxide back into the storage tank to maintain the pressure balance of the upstream pipeline.

3. The carbon dioxide supply device according to claim 1, characterized in that, The electric heating component of the dual reheater is an electric heater installed inside the heat exchange water jacket. The hot water circulation component includes a hot water inlet pipe and a hot water return pipe connected to the heat exchange water jacket. A circulating hot water pump is installed on the hot water return pipe, and a hot water regulating valve is installed on the hot water inlet pipe.

4. The carbon dioxide supply device according to claim 3, characterized in that, The hot water regulating valve is interlocked with the temperature detection device at the gas outlet of the dual reheater, and the hot water regulating valve is configured to automatically adjust its opening according to the temperature of the gas at the outlet of the dual reheater; the electric heater is interlocked with the temperature detection device, and the electric heater is configured to automatically adjust its heating power according to the temperature of the outlet gas.

5. The carbon dioxide supply device according to claim 1, characterized in that, The filter is located upstream of the flow meter, and the self-regulating pressure reducing valve is located downstream of the flow meter; the flow meter is interlocked with the gas flow regulating valve, and the gas flow regulating valve is configured to automatically adjust its opening degree according to the detection signal of the flow meter.

6. The carbon dioxide supply device according to claim 1, characterized in that, It also includes a bypass pipeline, the two ends of which are connected to the upstream pipeline of the self-regulating pressure reducing valve and the downstream pipeline of the gas volume regulating valve, respectively, and two manual throttle valves are connected in series on the bypass pipeline.

7. The carbon dioxide supply device according to claim 1, characterized in that, Safety valves are installed at multiple pressure change points in the gas delivery pipeline. Each safety valve has a maintenance valve at its inlet and a manual vent valve on the pipeline where each safety valve is located. The discharge ports of each safety valve are all connected to the same vent manifold, which is connected to the outside.

8. The carbon dioxide supply device according to claim 7, characterized in that, The maintenance valve is a ball valve, and the vent pipe is a vertically arranged high-altitude discharge pipe.

9. The carbon dioxide supply device according to claim 1, characterized in that, The gas delivery pipeline is equipped with multiple detection components, including a mechanical pressure gauge, a mechanical thermometer, and pressure transmitters and temperature transmitters corresponding to the pressure gauge and the thermometer. The pressure transmitters and temperature transmitters are used to output signals to a remote control system.

10. The carbon dioxide supply device according to claim 1, characterized in that, The air volume regulating valve is an electric valve or a pneumatic valve, and is equipped with a manual operation handwheel, configured to have two operation modes: remote automatic control and local manual control.

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