Coal radio frequency heating in-situ conversion hydrogen production experimental device and experimental method

Abstract

The invention provides a coal radio frequency heating in-situ conversion hydrogen production experimental device and experimental method. The coal radio frequency heating in-situ conversion hydrogen production experimental device comprises a shaft, a pressure adjusting assembly, a reaction container, a radio frequency assembly, a gas displacement assembly, a gas collection assembly and a data acquisition assembly. The shaft penetrates through the experimental coal sample and is abutted against the inner wall of the experimental coal sample; the radio frequency assembly comprises a radio frequency antenna, and at least one part of the radio frequency antenna is arranged in the shaft; the shaft and the experimental coal sample are arranged in a pressure cavity in the reaction container; the pressure adjusting assembly is communicated with the pressure cavity; the gas collecting assembly is communicated with the pressure cavity; the gas displacement assembly communicates with the pressure cavity and drives gas in the pressure cavity to flow into the gas collection assembly. The data acquisition assembly comprises an optical fiber temperature sensor, and the optical fiber temperature sensor is arranged in the pressure cavity. The problems that existing radio frequency hydrogen production experimental equipment lacks integration of multiple experimental functions and cannot accurately simulate the underground environment can be solved.

Description

Technical Field

[0001] This invention relates to the technical field of experimental equipment for hydrogen production from coal seams, and more specifically, to an experimental apparatus and method for in-situ conversion of coal into hydrogen via radio frequency heating. Background Technology

[0002] Currently, radio frequency (RF) heating technology has been widely used in the energy extraction field in recent years, especially as a means of in-situ hydrogen production in the development and utilization of deep coal resources, demonstrating its unique advantages. However, existing RF heating experimental equipment for testing collected coal samples has certain limitations in the in-situ hydrogen production experiments of deep coal resources, mainly in the following aspects: 1. Lack of integration of multiple experimental functions; existing RF heating experimental equipment mainly focuses on the heating function and fails to effectively integrate functions such as RF heating, pressurization, driving gas injection, and product gas collection. This means that during the experiment, the experimenter needs to switch between different devices to complete a series of operational experiments for hydrogen production from coal resources, which not only increases the complexity of the experiment but also reduces the experimental efficiency; 2. Inability to accurately simulate the underground environment; the mining and hydrogen production process of deep coal resources is greatly affected by the underground environment, including factors such as pressure and temperature. Existing RF heating experimental equipment usually cannot provide an environment close to the actual underground environment, and therefore cannot accurately predict and evaluate the hydrogen production effect under real geological conditions.

[0003] Therefore, existing radio frequency hydrogen production experimental equipment suffers from a lack of integration of multiple experimental functions and an inability to accurately simulate underground environments, which urgently need to be addressed. Summary of the Invention

[0004] This invention provides an experimental device and method for in-situ hydrogen production from coal via radio frequency heating, which at least solves the problems of existing radio frequency hydrogen production experimental equipment lacking the integration of multiple experimental functions and being unable to accurately simulate the underground environment.

[0005] To address the aforementioned problems, according to one aspect of the present invention, an experimental apparatus for in-situ hydrogen production from coal via radio frequency heating is provided, comprising: a well shaft, a pressure regulating component, a reaction vessel, a radio frequency component, a gas displacement component, a gas collection component, and a data acquisition component; the well shaft passes through an experimental coal sample and abuts against the inner wall of the experimental coal sample; the radio frequency component includes a radio frequency antenna, at least a portion of which is disposed within the well shaft, the radio frequency antenna being used to focus radio frequency energy onto the experimental coal sample for radio frequency heating; the well shaft is used to protect the radio frequency antenna; the reaction vessel has a pressure chamber inside, and both the well shaft and the experimental coal sample are disposed within the pressure chamber; the pressure regulating component is connected to the pressure chamber via a pipeline and is used to regulate the pressure within the pressure chamber to simulate the pressure experienced by underground coal; the gas collection component is connected to the pressure chamber via a pipeline and is used to collect the gas generated by the experimental coal sample within the pressure chamber; the gas displacement component is connected to the pressure chamber via a pipeline and, by outputting displacement gas, drives the gas within the pressure chamber to flow into the gas collection component; the data acquisition component includes a fiber optic temperature sensor disposed within the pressure chamber and is used to monitor the internal temperature of the pressure chamber.

[0006] Furthermore, the radio frequency component also includes a radio frequency transmitter for transmitting radio frequency energy; the radio frequency antenna is detachably installed inside the wellbore and spaced apart from the inner wall of the wellbore, and the radio frequency antenna receives the radio frequency energy emitted by the radio frequency transmitter and focuses it onto the experimental coal sample to heat the experimental coal sample.

[0007] Furthermore, the radio frequency component also includes a conduit and a coupler. The coupler is connected to the radio frequency antenna circuit, and the conduit is connected to the radio frequency transmitter and the coupler respectively. The conduit is used to transmit radio frequency signals carrying radio frequency energy; the coupler is used to improve the transmission efficiency of radio frequency signals.

[0008] Furthermore, the experimental device for in-situ hydrogen production by coal radio frequency heating also includes an intelligent control terminal; the radio frequency component also includes an automatic tuning controller, which is electrically connected to the intelligent control terminal and connected to the radio frequency transmitter. The automatic tuning controller is used to adjust the frequency and power of the radio frequency transmitter.

[0009] Furthermore, the experimental device for in-situ conversion of coal into hydrogen via radio frequency heating also includes an electromagnetic shielding container. The electromagnetic shielding container has a shielding cavity inside, and the reaction vessel is set inside the shielding cavity. The electromagnetic shielding container is used to prevent radio frequency energy from leaking out of the pressure cavity.

[0010] Furthermore, the data acquisition component also includes a pressure sensor and a flow sensor; the pressure sensor is installed inside the pressure chamber to detect the internal pressure of the pressure chamber; the flow sensor is installed on the pipeline connecting the gas displacement component and the pressure chamber, and is used to detect the flow rate of the displacement gas entering the pressure chamber.

[0011] Furthermore, the experimental device for in-situ hydrogen production from coal via radio frequency heating also includes an intelligent control terminal; the intelligent control terminal is electrically connected to the pressure regulating component, the radio frequency component, the gas displacement component, the gas collection component, the fiber optic temperature sensor, the pressure sensor, and the flow sensor, respectively; the intelligent control terminal calculates the influence of different experimental parameters on the hydrogen production efficiency of the experimental coal sample by controlling the heating power, heating frequency, pressure in the pressure chamber, and displacement gas flow rate of the experimental coal sample.

[0012] Furthermore, the gas collection assembly also includes a first gas storage tank, which is connected to the pressure chamber via a pipeline and is used to collect the gas generated in the pressure chamber by the experimental coal sample; the gas displacement assembly also includes a second gas storage tank, which is connected to the pressure chamber via a pipeline and is used to store the displacement gas.

[0013] According to another aspect of the present invention, an experimental method is provided, which is applied to the above-mentioned coal radio frequency heating in-situ conversion hydrogen production experimental device. The experimental method includes the following steps: passing a well shaft through the experimental coal sample so as to abut against the inner wall of the experimental coal sample so that the well shaft supports the experimental coal sample; placing the experimental coal sample in the pressure chamber and sealing the pressure chamber; controlling the pressure regulating component to adjust the pressure in the pressure chamber to a set value; turning on the radio frequency component to heat the experimental coal sample; controlling the gas collection component to collect the gas generated by the experimental coal sample and performing gas analysis to obtain the influence of different experimental parameters on the hydrogen production efficiency of the experimental coal sample.

[0014] Furthermore, the experimental method also includes the following steps: while keeping the radio frequency of the radio frequency component constant, changing the radio frequency power of the radio frequency component, and conducting multiple experiments to determine the changes in the types and volumes of gases produced by the experimental coal sample under different radio frequency powers; while keeping the radio frequency power of the radio frequency component constant, changing the radio frequency of the radio frequency component, and conducting multiple experiments to determine the changes in the types and volumes of gases produced by the experimental coal sample under different radio frequency frequencies; while keeping the radio frequency power and radio frequency of the radio frequency component constant, changing the type of displacing gas, and conducting multiple experiments to determine the changes in the types and volumes of gases produced by the experimental coal sample under different displacing gas conditions; while keeping the radio frequency power, radio frequency, and type of displacing gas of the radio frequency component constant, changing the pressure in the pressure chamber, and conducting multiple experiments to determine the changes in the types and volumes of gases produced by the experimental coal sample under different pressure conditions.

[0015] Applying the technical solution of this invention, this invention provides an experimental device for in-situ hydrogen production from coal via radio frequency heating, comprising: a well shaft, a pressure regulating component, a reaction vessel, a radio frequency component, a gas displacement component, a gas collection component, and a data acquisition component; the well shaft passes through the experimental coal sample and abuts against the inner wall of the experimental coal sample; the radio frequency component includes a radio frequency antenna, at least a portion of which is disposed within the well shaft, and the radio frequency antenna is used to focus radio frequency energy onto the experimental coal sample for radio frequency heating; the well shaft is used to protect the radio frequency antenna; the reaction vessel has a pressure chamber inside, and both the well shaft and the experimental coal sample are disposed within the pressure chamber; the pressure regulating component is connected to the pressure chamber via a pipeline and is used to regulate the pressure within the pressure chamber to simulate the pressure experienced by underground coal; the gas collection component is connected to the pressure chamber via a pipeline and is used to collect the gas generated by the experimental coal sample within the pressure chamber; the gas displacement component is connected to the pressure chamber via a pipeline and, by outputting displacement gas, drives the gas within the pressure chamber to flow into the gas collection component; the data acquisition component includes a fiber optic temperature sensor, which is disposed within the pressure chamber and is used to monitor the internal temperature of the pressure chamber.

[0016] This invention integrates multiple experimental functions, including radio frequency heating, pressurization, gas displacement, gas collection, and data acquisition, into a single device. This is achieved by setting up a wellbore, pressure regulation component, reaction vessel, radio frequency component, gas displacement component, gas collection component, and data acquisition component working in tandem. This means that during experiments, personnel do not need to switch between multiple devices to complete a series of operations on the experimental coal sample, which not only reduces experimental complexity but also improves efficiency. By setting up a pressure chamber, pressure regulation component, and radio frequency heating component, the pressure and temperature of the underground environment can be accurately simulated, thus providing the experimental coal sample with an environment close to that of the actual underground environment. This provides structural support for subsequent accurate prediction and evaluation of hydrogen production efficiency under real geological conditions, facilitating in-depth research on the influence of different parameters on hydrogen production efficiency. In practical applications… The experimental device for in-situ hydrogen production via radio frequency heating of coal, proposed in this invention, not only allows for precise control of the radio frequency heating frequency and power, but also enables gas displacement and collection while simulating the underground environment. This significantly improves the flexibility of the experiment and the reliability of the data. Furthermore, this invention effectively guides how to optimize hydrogen production efficiency by adjusting radio frequency heating parameters and gas displacement conditions, thus opening up new pathways for the sustainable development and utilization of deep coal resources. It is suitable not only for in-depth basic research in scientific research institutions but also for pre-experimentation in industrial sectors before actual operation, ensuring the feasibility of the process and maximizing economic benefits. This invention features a simple structure and low cost, facilitating assembly and subsequent maintenance. It solves the problems of existing radio frequency hydrogen production experimental equipment lacking integration of multiple experimental functions and failing to accurately simulate the underground environment, making it suitable for large-scale promotion and use. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A schematic diagram of the structure of the experimental apparatus for in-situ hydrogen production by radio frequency heating of coal provided in an embodiment of the present invention is shown.

[0019] The above figures include the following reference numerals:

[0020] 10. Shaft;

[0021] 20. Pressure regulating assembly;

[0022] 30. Reaction vessel; 31. Pressure chamber;

[0023] 40. Radio frequency components; 41. Radio frequency antenna; 42. Radio frequency transmitter; 43. Conduit; 44. Coupler; 45. Automatic tuning controller;

[0024] 50. Gas displacement assembly; 51. Second gas storage tank;

[0025] 60. Gas collection assembly; 61. First gas storage tank;

[0026] 70. Data acquisition components;

[0027] 80. Experimental coal sample;

[0028] 90. Intelligent control terminal;

[0029] 100. Electromagnetic shielding container. Detailed Implementation

[0030] 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. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. 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.

[0031] like Figure 1As shown, an embodiment of the present invention provides an experimental apparatus for in-situ hydrogen production from coal via radio frequency heating, comprising: a well shaft 10, a pressure regulating component 20, a reaction vessel 30, a radio frequency component 40, a gas displacement component 50, a gas collection component 60, and a data acquisition component 70; the well shaft 10 passes through an experimental coal sample 80 and abuts against the inner wall of the experimental coal sample 80; the radio frequency component 40 includes a radio frequency antenna 41, at least a portion of which is disposed within the well shaft 10, and the radio frequency antenna 41 is used to focus radio frequency energy onto the experimental coal sample 80 for radio frequency heating; the well shaft 10 is used to protect the radio frequency antenna 41; the reaction vessel 30 has a pressure chamber 31 inside, and the well shaft 10 and the experimental coal sample 80 are connected. Sample 80 is placed inside pressure chamber 31; pressure regulating component 20 is connected to pressure chamber 31 through pipeline and is used to regulate the pressure inside pressure chamber 31 to simulate the pressure borne by underground coal; gas collection component 60 is connected to pressure chamber 31 through pipeline and is used to collect the gas generated by experimental coal sample 80 in pressure chamber 31; gas displacement component 50 is connected to pressure chamber 31 through pipeline and drives the gas in pressure chamber 31 to flow into gas collection component 60 by outputting displacement gas; data acquisition component 70 includes fiber optic temperature sensor, which is placed inside pressure chamber 31 and is used to monitor the internal temperature of pressure chamber 31.

[0032] This invention integrates multiple experimental functions, including radio frequency heating, pressurization, gas displacement, gas collection, and data acquisition, onto an experimental coal sample 80 within a single device. This is achieved by setting up a wellbore 10, a pressure regulating component 20, a reaction vessel 30, a radio frequency component 40, a gas displacement component 50, a gas collection component 60, and a data acquisition component 70. This means that during the experiment, personnel do not need to switch between multiple devices to complete a series of operations on the experimental coal sample 80, which not only reduces the complexity of the experiment but also improves its efficiency. By setting up a pressure chamber 31, a pressure regulating component 20, and a radio frequency heating component, the pressure and temperature of the underground environment can be accurately simulated, thus providing an environment close to the actual underground environment for the experimental coal sample 80. This provides structural support for accurately predicting and evaluating the hydrogen production effect under real geological conditions, facilitating in-depth research on the effect of different parameters on hydrogen production efficiency. The invention demonstrates the following: In practical applications, the coal radio frequency heating in-situ hydrogen production experimental device proposed in this invention can not only precisely control the frequency and power of radio frequency heating, but also simulate the underground environment while simultaneously performing gas displacement and collection. This greatly improves the flexibility of the experiment and the reliability of the data. Furthermore, this invention effectively guides how to optimize hydrogen production efficiency by adjusting radio frequency heating parameters and gas displacement conditions, thus opening up new pathways for the sustainable development and utilization of deep coal resources. It is suitable not only for in-depth basic research in scientific research institutions but also for pre-experimentation in industrial sectors before actual operation, ensuring the feasibility of the process and maximizing economic benefits. The invention has a simple structure and low cost, is easy to assemble and maintain, and solves the problems of existing radio frequency hydrogen production experimental equipment lacking the integration of multiple experimental functions and the inability to accurately simulate the underground environment. Therefore, it is suitable for large-scale promotion and use.

[0033] like Figure 1 As shown, the radio frequency component 40 also includes a radio frequency transmitter 42, which is used to transmit radio frequency energy; the radio frequency antenna 41 is detachably disposed inside the well shaft 10 and spaced apart from the inner wall of the well shaft 10. The radio frequency antenna 41 receives the radio frequency energy emitted by the radio frequency transmitter 42 and focuses it onto the experimental coal sample 80 to heat the experimental coal sample 80.

[0034] The radio frequency (RF) component 40 integrates an RF transmitter 42 and an RF antenna 41. The RF transmitter 42 generates RF energy, while the RF antenna 41 is detachably installed inside the wellbore 10, maintaining a certain distance from the inner wall of the wellbore 10. After receiving the RF energy emitted by the RF transmitter 42, the RF antenna 41 can focus it and directly apply it to the experimental coal sample 80 (hereinafter referred to as the "coal sample"), achieving precise heating of the coal sample. This design not only improves the flexibility of the coal RF heating in-situ conversion hydrogen production experimental device, facilitating the replacement or adjustment of the RF antenna 41 according to different coal RF hydrogen production experiments (hereinafter referred to as "experiments"), but also ensures the effective transmission and focusing of RF energy, improving the efficiency and controllability of RF hydrogen production. During the experiment, the precise application of RF energy can promote molecular decomposition within the coal sample, accelerating hydrogen generation. Simultaneously, the detachable RF antenna 41 design facilitates maintenance and upgrades, ensuring the long-term stable operation of the coal RF heating in-situ conversion hydrogen production experimental device.

[0035] like Figure 1 As shown, the radio frequency component 40 also includes a conduit 43 and a coupler 44. The coupler 44 is connected to the radio frequency antenna 41 in a circuit. The conduit 43 is connected to the radio frequency transmitter 42 and the coupler 44 respectively. The conduit 43 is used to transmit radio frequency signals carrying radio frequency energy. The coupler 44 is used to improve the transmission efficiency of radio frequency signals.

[0036] The radio frequency (RF) component 40 further optimizes the transmission path and efficiency of RF energy through the conduit 43 and coupler 44. Specifically, the conduit 43 acts as a bridge connecting the RF transmitter 42 and the coupler 44, responsible for transmitting RF signals, while the coupler 44 improves the transmission efficiency of RF signals, ensuring that RF energy can be more effectively received by the RF antenna 41 and focused onto the experimental coal sample 80, thereby achieving precise heating. This design not only improves the efficiency of RF heating but also enhances the overall performance of the coal RF heating in-situ conversion hydrogen production experimental device, making the coal RF hydrogen production experiment (i.e., the experiment) conditions more controllable and improving the accuracy and reliability of the experimental results. Optionally, in other embodiments not shown in the figures, the RF component 40 can further improve the flexibility and accuracy of RF heating by adjusting its internal structure or adding other components to meet more complex or specific experimental needs.

[0037] like Figure 1 As shown, the experimental device for in-situ conversion of coal into hydrogen via radio frequency heating also includes an intelligent control terminal 90; the radio frequency component 40 also includes an automatic tuning controller 45, which is electrically connected to the intelligent control terminal 90 and connected to the radio frequency transmitter 42. The automatic tuning controller 45 is used to adjust the frequency and power of the radio frequency transmitter 42.

[0038] The collaboration between the intelligent control terminal 90 and the automatic tuning controller 45 brings more intelligent control capabilities to the coal radio frequency heating in-situ hydrogen production experimental device. The automatic tuning controller 45 is electrically connected to the intelligent control terminal 90 and directly connected to the radio frequency transmitter 42. This design allows experimenters to remotely adjust the frequency and power of the radio frequency transmitter 42 via the intelligent control terminal 90, thereby precisely controlling the heating conditions of the radio frequency antenna 41. The control provided by the intelligent control terminal 90 not only simplifies the operation process of the coal radio frequency hydrogen production experiment (i.e., the experiment itself) but also improves the accuracy and repeatability of the experiment. It enables experimenters to quickly test the radio frequency hydrogen production efficiency of the experimental coal sample 80 under different conditions, and then optimize the radio frequency heating parameters to achieve the best hydrogen production. The combined use of the intelligent control terminal 90 and the automatic tuning controller 45 provides strong support for the research and development of in-situ hydrogen production technology from deep coal resources. It also enhances the safety and controllability of the experiment, ensuring that parameter adjustments during the experiment can respond promptly to experimental needs and providing rich parameter settings for experimental data analysis.

[0039] like Figure 1 As shown, the experimental apparatus for in-situ conversion of coal into hydrogen via radio frequency heating also includes an electromagnetic shielding container 100. The electromagnetic shielding container 100 has a shielding cavity inside, and the reaction container 30 is set inside the shielding cavity. The electromagnetic shielding container 100 is used to prevent radio frequency energy from leaking out of the pressure chamber 31.

[0040] The electromagnetic shielding container 100 effectively shields the radio frequency energy generated by the radio frequency component 40, preventing energy leakage and ensuring the safety of the coal radio frequency hydrogen production experiment (i.e., the experiment) while improving the utilization rate of radio frequency energy. The shielding cavity inside the electromagnetic shielding container 100 completely surrounds the reaction container 30, forming a closed working environment. This ensures that the radio frequency energy is concentrated within the designated experimental area, avoiding its impact on the external environment and reducing energy loss, thus improving experimental efficiency. Through the shielding effect of the electromagnetic shielding container 100, the radio frequency antenna 41 can more stably transmit radio frequency energy to the experimental coal sample 80, enabling precise radio frequency heating experiments and accurate evaluation of the radio frequency hydrogen production effect.

[0041] like Figure 1 As shown, the data acquisition component 70 also includes a pressure sensor and a flow sensor; the pressure sensor is installed inside the pressure chamber 31 and is used to detect the internal pressure of the pressure chamber 31; the flow sensor is installed on the pipeline connecting the gas displacement component 50 and the pressure chamber 31 and is used to detect the flow rate of the displacement gas entering the pressure chamber 31.

[0042] The data acquisition component 70 further integrates a pressure sensor and a flow sensor. The pressure sensor, located inside the pressure chamber 31, monitors and records pressure changes within the chamber in real time, crucial for simulating the underground pressure experienced by the experimental coal sample 80. The flow sensor is installed in the pipeline between the gas displacement component 50 and the pressure chamber 31. By detecting the flow rate of the displacement gas, the gas displacement process can be precisely controlled, ensuring that the gas generated by the experimental coal sample 80 is effectively and completely collected into the gas collection component 60. These pressure and flow sensors are connected to the intelligent control terminal 90, enabling real-time monitoring and data acquisition of parameters for the coal radio frequency hydrogen production experiment (i.e., the experiment itself). This provides crucial data support for subsequent analysis of the relationship between radio frequency hydrogen production efficiency and experimental conditions, thereby helping to optimize the experimental scheme and improve hydrogen production and purity. Furthermore, by adjusting parameters such as radio frequency power, frequency, type of displacement gas, and pressure within the pressure chamber 31, researchers can systematically study the influence mechanism of these factors on coal radio frequency hydrogen production, providing a scientific basis for efficient hydrogen production from deep coal resources.

[0043] like Figure 1 As shown, the experimental apparatus for in-situ hydrogen production from coal via radio frequency heating also includes an intelligent control terminal 90. The intelligent control terminal 90 is electrically connected to the pressure regulating component 20, the radio frequency component 40, the gas displacement component 50, the gas collection component 60, the fiber optic temperature sensor, the pressure sensor, and the flow sensor. The intelligent control terminal 90 calculates the effects of different experimental parameters on the hydrogen production efficiency of the experimental coal sample 80 by controlling the heating power, heating frequency, pressure in the pressure chamber 31, and displacement gas flow rate of the experimental coal sample 80.

[0044] The intelligent control terminal 90 is the core control system of the entire coal radio frequency heating in-situ conversion hydrogen production experimental device. It is electrically connected to the pressure regulation component 20, radio frequency component 40, gas displacement component 50, gas collection component 60, and corresponding sensors. Through centralized control by the intelligent control terminal 90, the heating power and frequency of the experimental coal sample 80 can be precisely controlled, while the pressure in the pressure chamber 31 and the flow rate of the displacement gas can be adjusted, thereby systematically studying the impact of these parameters on hydrogen production efficiency. The intelligent control terminal 90 can automatically adjust experimental conditions according to different experimental parameters input by the user, collect and analyze the data generated during the experiment, and provide a scientific basis for optimizing the radio frequency hydrogen production process. The integrated control method of the intelligent control terminal 90 greatly improves the accuracy and efficiency of the coal radio frequency hydrogen production experiment (i.e., the experiment itself), while also simplifying the experimental operation process and ensuring the accuracy and consistency of the experimental data.

[0045] like Figure 1As shown, the gas collection assembly 60 also includes a first gas storage tank 61, which is connected to the pressure chamber 31 via a pipeline and is used to collect the gas generated in the pressure chamber 31 by the experimental coal sample 80; the gas displacement assembly 50 also includes a second gas storage tank 51, which is connected to the pressure chamber 31 via a pipeline and is used to store the displacement gas.

[0046] The gas collection assembly 60 also includes a first gas storage tank 61, which is connected to the pressure chamber 31 via a pipeline. This tank collects the gas generated by the experimental coal sample 80 under radio frequency heating, facilitating gas storage and subsequent analysis. The gas displacement assembly 50 also includes a second gas storage tank 51, which is connected to the pressure chamber 31 via a pipeline. This tank stores and provides displacement gas to drive the gas flow from the pressure chamber 31 to the gas collection assembly 60, ensuring effective collection of the gas generated in the coal radio frequency hydrogen production experiment (i.e., the experiment) and accurate assessment of hydrogen production efficiency. Through this design, researchers can more precisely control experimental conditions, effectively combining radio frequency heating with the gas displacement process, further improving experimental accuracy and data reliability, and providing more comprehensive experimental conditions for the coal radio frequency hydrogen production experiment. Simultaneously, the configuration of the gas collection assembly 60 allows the experimental device to adapt to different types of displacement gases, expanding the experimental scope and facilitating research on the influence of different parameters on hydrogen production efficiency. In addition, the use of the first gas storage tank 61 and the second gas storage tank 51 can realize the efficient utilization of the gas and displacement gas generated in the experiment, reduce gas waste in the experimental process, improve the economy and practicality of the experiment, and facilitate the research and application of coal radio frequency hydrogen production technology.

[0047] This invention also provides an experimental method (i.e., a coal radio frequency hydrogen production experimental method), which is applied to the above-mentioned coal radio frequency heating in-situ conversion hydrogen production experimental device. The experimental method includes the following steps: passing the well shaft 10 through the experimental coal sample 80 so that it abuts against the inner wall of the experimental coal sample 80 so that the well shaft 10 supports the experimental coal sample 80; placing the experimental coal sample 80 in the pressure chamber 31 and sealing the pressure chamber 31; controlling the pressure regulating component 20 to adjust the pressure in the pressure chamber 31 to a set value; turning on the radio frequency component 40 to heat the experimental coal sample 80; controlling the gas collection component 60 to collect the gas generated by the experimental coal sample 80 and performing gas analysis to obtain the influence of different experimental parameters on the hydrogen production efficiency of the experimental coal sample 80.

[0048] The experimental method involves passing the wellbore 10 through the experimental coal sample 80 and ensuring its contact with the inner wall of the sample, effectively supporting the sample and ensuring the accuracy of radio frequency heating. After placing the experimental coal sample 80 into the pressure chamber 31 inside the reaction vessel 30, the pressure regulating component 20 precisely adjusts the pressure within the pressure chamber 31 to a set value, simulating the real environment of underground coal and improving the reliability and accuracy of the coal radio frequency hydrogen production experiment (i.e., the experiment). The activation of the radio frequency component 40 enables radio frequency heating of the experimental coal sample 80, while the gas displacement component 50 outputs displacement gas to drive the gas flow within the pressure chamber 31, ensuring that the generated gas can smoothly reach the gas collection component 60. This not only promotes effective gas collection but also facilitates the analysis of hydrogen production efficiency. The data acquisition component 70 monitors the temperature changes during the radio frequency heating process in real time, providing data support for optimizing experimental parameters. By implementing the above steps, this method can not only improve the efficiency and accuracy of radio frequency hydrogen production experiments, but also conduct in-depth research on the impact of different experimental parameters on hydrogen production efficiency, providing scientific guidance for radio frequency hydrogen production technology in deep coal resources, and has good application prospects and research value.

[0049] The experimental method provided by this invention further includes the following steps: While keeping the radio frequency of the radio frequency component 40 constant, changing the radio frequency power of the radio frequency component 40, and conducting multiple experiments to determine the changes in the types and volumes of gases produced by the experimental coal sample 80 under different radio frequency powers; while keeping the radio frequency power of the radio frequency component 40 constant, changing the radio frequency of the radio frequency component 40, and conducting multiple experiments to determine the changes in the types and volumes of gases produced by the experimental coal sample 80 under different radio frequency frequencies; while keeping the radio frequency power and radio frequency of the radio frequency component 40 constant, changing the type of displacing gas, and conducting multiple experiments to determine the changes in the types and volumes of gases produced by the experimental coal sample 80 under different displacing gas conditions; while keeping the radio frequency power, radio frequency, and type of displacing gas of the radio frequency component 40 constant, changing the pressure in the pressure chamber 31, and conducting multiple experiments to determine the changes in the types and volumes of gases produced by the experimental coal sample 80 under different pressure conditions.

[0050] When the radio frequency (RF) frequency of the RF component 40 remains constant while the RF power changes, researchers can conduct multiple experiments to determine the changes in the types and volumes of gases produced by the experimental coal sample 80 under different RF powers. This process helps to explore the impact of RF power on hydrogen production efficiency. Similarly, when the RF power is constant, by adjusting the RF frequency, the coal RF hydrogen production experiment (i.e., the experiment) can assess the impact of frequency changes on hydrogen production efficiency and further optimize the RF parameter combination. Furthermore, with the RF power and frequency constant, changing the type of displacing gas allows for the study of the gas products of the experimental coal sample 80 under different gas environments, which is crucial for optimizing the selection of displacing gas. Finally, when the RF power, frequency, and type of displacing gas are all fixed, by adjusting the pressure in the pressure chamber 31, the impact of different underground environments on the amount and types of hydrogen produced can be simulated, providing a quantitative basis for the practical application of RF hydrogen production technology. The design of the above experimental steps with controlled variables not only allows for a comprehensive analysis of the efficiency of RF hydrogen production but also provides researchers with a systematic research approach. By precisely controlling experimental conditions, the specific impact of different parameters on hydrogen yield and quality can be studied, greatly improving the comparability and scientific value of the experiment. With comprehensive optimization of multiple experimental conditions, the experimental device can more effectively guide the radio frequency hydrogen production process and promote the efficient utilization of coal resources.

[0051] The specific working process and principle of one embodiment of the present invention will now be described in detail as follows:

[0052] In the experimental apparatus for in-situ hydrogen production from coal via radio frequency heating of this application, the experimental coal sample 80 is first placed in the pressure chamber 31 inside the reaction vessel 30. The well shaft 10 passes through the experimental coal sample 80 and abuts against its inner wall to ensure that the radio frequency antenna 41 effectively heats the experimental coal sample 80. The pressure regulating component 20 is connected to the pressure chamber 31 through a pipeline to regulate the pressure inside to a set value to simulate the pressure environment experienced by underground coal. The radio frequency transmitter 42 of the radio frequency component 40 generates radio frequency energy, which is transmitted to the coupler 44 through the conduit 43, and then received and focused onto the experimental coal sample 80 by the radio frequency antenna 41 to achieve radio frequency heating. The second gas storage tank 51 of the gas displacement component 50 outputs displacement gas to the pressure chamber 31. Through gas displacement, the gas generated by the experimental coal sample 80 flows into the first gas storage tank 61 of the gas collection component 60.

[0053] Secondly, the fiber optic temperature sensor, pressure sensor, and flow sensor in the data acquisition component 70 monitor the changes in temperature, pressure, and gas flow rate during the coal radio frequency hydrogen production experiment (i.e., the experiment) in real time, and transmit the data to the intelligent control terminal 90 for calculating the impact of different experimental parameters on the hydrogen production efficiency of the experimental coal sample 80. While keeping the radio frequency constant, the intelligent control terminal 90 adjusts the radio frequency power to conduct multiple experiments, measuring changes in gas type and volume; similarly, while keeping the radio frequency power constant, the radio frequency is changed, and multiple experiments are conducted to evaluate gas changes at different frequencies; keeping the radio frequency power and frequency constant, the type of displacing gas is changed, and multiple experiments are conducted to observe changes in gas products; finally, under the condition that the radio frequency power, frequency, and type of displacing gas remain constant, the pressure in the pressure chamber 31 is adjusted, and multiple experiments are conducted to measure the amount and type of gas generated under different pressure conditions.

[0054] Furthermore, during the experiment, the shielding cavity inside the electromagnetic shielding container 100 further prevented the leakage of radio frequency energy, ensuring the safety of the experiment and the concentrated utilization of radio frequency energy. Under the unified control of the intelligent control terminal 90, the entire experimental process achieved efficient integration of radio frequency heating, pressure regulation, gas displacement, gas collection, and data acquisition, providing precise experimental conditions for in-depth research on the efficiency and mechanism of coal-to-hydrogen radio frequency production.

[0055] In summary, the above design not only simplifies experimental operations but also significantly improves the accuracy of hydrogen production prediction, providing strong technical support for the development and utilization of deep coal resources, and showing great application potential, especially in the field of in-situ hydrogen production.

[0056] In summary, this invention provides an experimental device and method for in-situ hydrogen production from coal via radio frequency heating. By coordinating the operation of a wellbore 10, a pressure regulating component 20, a reaction vessel 30, a radio frequency component 40, a gas displacement component 50, a gas collection component 60, and a data acquisition component 70, this invention integrates multiple experimental functions, including radio frequency heating, pressurization, gas displacement, gas collection, and data acquisition, onto the experimental coal sample 80 within a single device. This means that during the experiment, personnel do not need to switch between multiple devices to complete a series of operations on the experimental coal sample 80, which not only reduces the complexity of the experiment but also improves its efficiency. By setting up a pressure chamber 31, a pressure regulating component 20, and a radio frequency heating component, the pressure and temperature of the underground environment can be accurately simulated, thus providing the experimental coal sample 80 with an environment close to that of the actual underground environment. This provides structural support for the subsequent accurate prediction and evaluation of the hydrogen production effect under real geological conditions. This invention facilitates in-depth research into the impact of different parameters on hydrogen production efficiency. In practical applications, it has been found that the coal radiofrequency heating in-situ hydrogen production experimental device proposed in this invention can not only precisely control the frequency and power of radiofrequency heating, but also perform gas displacement and collection while simulating the underground environment, greatly improving the flexibility of the experiment and the reliability of the data. Furthermore, this invention can effectively guide how to optimize hydrogen production efficiency by adjusting radiofrequency heating parameters and gas displacement conditions, thus opening up new paths for the sustainable development and utilization of deep coal resources. It is suitable not only for in-depth basic research in scientific research institutions, but also for pre-experimentation in industrial sectors before actual operation, ensuring the feasibility of the process and maximizing economic benefits. This invention has a simple structure and low cost, is easy to assemble and maintain, and solves the problems of existing radiofrequency hydrogen production experimental equipment lacking the integration of multiple experimental functions and the inability to accurately simulate the underground environment, making it suitable for large-scale promotion and use.

[0057] The technical features of the embodiments described above can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification.

[0058] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0059] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0060] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0061] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0062] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An experimental apparatus for in-situ hydrogen production from coal via radio frequency heating, characterized in that, include: The system comprises a shaft (10), a pressure regulating assembly (20), a reaction vessel (30), a radio frequency assembly (40), a gas displacement assembly (50), a gas collection assembly (60), and a data acquisition assembly (70). The shaft (10) passes through the experimental coal sample (80) and abuts against the inner wall of the experimental coal sample (80). The radio frequency assembly (40) includes a radio frequency antenna (41), at least a portion of which is disposed within the shaft (10). The radio frequency antenna (41) is used to focus radio frequency energy onto the experimental coal sample (80) for radio frequency heating. The shaft (10) is used to protect the radio frequency antenna (41). The reaction vessel (30) has a pressure chamber (31) inside, and both the shaft (10) and the experimental coal sample (80) are disposed within the pressure chamber (31). The pressure regulating component (20) is connected to the pressure chamber (31) through a pipeline and is used to regulate the pressure inside the pressure chamber (31) to simulate the pressure borne by underground coal. The gas collection component (60) is connected to the pressure chamber (31) through a pipeline and is used to collect the gas generated by the experimental coal sample (80) in the pressure chamber (31). The gas displacement component (50) is connected to the pressure chamber (31) through a pipeline and drives the gas in the pressure chamber (31) to flow into the gas collection component (60) by outputting displacement gas. The data acquisition component (70) includes an optical fiber temperature sensor, which is installed inside the pressure chamber (31) to monitor the internal temperature of the pressure chamber (31).

2. The experimental apparatus for in-situ hydrogen production via radio frequency heating of coal according to claim 1, characterized in that, The radio frequency component (40) also includes a radio frequency transmitter (42) for transmitting radio frequency energy; the radio frequency antenna (41) is detachably disposed inside the well shaft (10) and spaced apart from the inner wall of the well shaft (10); the radio frequency antenna (41) receives the radio frequency energy emitted by the radio frequency transmitter (42) and focuses it onto the experimental coal sample (80) to heat the experimental coal sample (80).

3. The experimental apparatus for in-situ hydrogen production via radio frequency heating of coal according to claim 2, characterized in that, The radio frequency component (40) also includes a conduit (43) and a coupler (44). The coupler (44) is connected to the radio frequency antenna (41) circuit. The conduit (43) is connected to the radio frequency transmitter (42) and the coupler (44) respectively. The conduit (43) is used to transmit radio frequency signals carrying radio frequency energy. The coupler (44) is used to improve the transmission efficiency of the radio frequency signals.

4. The experimental apparatus for in-situ hydrogen production via radio frequency heating of coal according to claim 3, characterized in that, The coal radio frequency heating in-situ conversion hydrogen production experimental device also includes an intelligent control terminal (90); the radio frequency component (40) also includes an automatic tuning controller (45), the automatic tuning controller (45) is electrically connected to the intelligent control terminal (90), and the automatic tuning controller (45) is connected to the radio frequency transmitter (42), the automatic tuning controller (45) is used to adjust the frequency and power of the radio frequency transmitter (42).

5. The experimental apparatus for in-situ hydrogen production via radio frequency heating of coal according to claim 1, characterized in that, The experimental apparatus for in-situ conversion of coal radio frequency heating to produce hydrogen also includes an electromagnetic shielding container (100), which has a shielding cavity inside. The reaction container (30) is located inside the shielding cavity. The electromagnetic shielding container (100) is used to prevent radio frequency energy from leaking out of the pressure chamber (31).

6. The experimental apparatus for in-situ hydrogen production via radio frequency heating of coal according to claim 1, characterized in that, The data acquisition component (70) also includes a pressure sensor and a flow sensor; the pressure sensor is disposed in the pressure chamber (31) and is used to detect the internal pressure of the pressure chamber (31); the flow sensor is disposed on the pipeline connecting the gas displacement component (50) and the pressure chamber (31) and is used to detect the flow rate of the displacement gas entering the pressure chamber (31).

7. The experimental apparatus for in-situ hydrogen production via radio frequency heating of coal according to claim 6, characterized in that, The experimental apparatus for in-situ hydrogen production by radio frequency heating of coal also includes an intelligent control terminal (90); the intelligent control terminal (90) is electrically connected to the pressure regulating component (20), the radio frequency component (40), the gas displacement component (50), the gas collection component (60), the fiber optic temperature sensor, the pressure sensor and the flow sensor respectively; the intelligent control terminal (90) calculates the effect of different experimental parameters on the hydrogen production efficiency of the experimental coal sample (80) by controlling the heating power, heating frequency, pressure in the pressure chamber (31) and the flow rate of the displacement gas of the experimental coal sample (80).

8. The experimental apparatus for in-situ hydrogen production via radio frequency heating of coal according to claim 1, characterized in that, The gas collection assembly (60) further includes a first gas storage tank (61), which is connected to the pressure chamber (31) via a pipeline and is used to collect the gas generated in the pressure chamber (31) by the experimental coal sample (80); the gas displacement assembly (50) further includes a second gas storage tank (51), which is connected to the pressure chamber (31) via a pipeline and is used to store the displacement gas.

9. An experimental method, characterized in that, The experimental method is applied to the coal radio frequency heating in-situ conversion hydrogen production experimental device according to any one of claims 1 to 8. The experimental method includes the following steps: passing the well shaft (10) through the experimental coal sample (80) so that it abuts against the inner wall of the experimental coal sample (80) so that the well shaft (10) supports the experimental coal sample (80); placing the experimental coal sample (80) in the pressure chamber (31) and sealing the pressure chamber (31); controlling the pressure regulating component (20) to adjust the pressure in the pressure chamber (31) to a set value; turning on the radio frequency component (40) to heat the experimental coal sample (80); controlling the gas collection component (60) to collect the gas generated by the experimental coal sample (80) and performing gas analysis to obtain the influence of different experimental parameters on the hydrogen production efficiency of the experimental coal sample (80).

10. The experimental method according to claim 9, characterized in that, The experimental method also includes the following steps: While keeping the radio frequency of the radio frequency component (40) constant, the radio frequency power of the radio frequency component (40) is changed, and multiple experiments are conducted to determine the changes in the type and volume of gas produced by the experimental coal sample (80) under different radio frequency powers. While keeping the radio frequency power of the radio frequency component (40) constant, the radio frequency frequency of the radio frequency component (40) is changed, and multiple experiments are conducted to determine the changes in the type and volume of gas produced by the experimental coal sample (80) at different radio frequency. While keeping the radio frequency power and radio frequency of the radio frequency component (40) constant, the type of the displacement gas is changed, and multiple experiments are conducted to determine the changes in the type and volume of gas produced by the experimental coal sample (80) under different displacement gas conditions. While keeping the radio frequency power, radio frequency and type of displacing gas of the radio frequency component (40) unchanged, the pressure in the pressure chamber (31) is changed, and the changes in the type and volume of gas produced by the experimental coal sample (80) under different pressure conditions are determined through multiple experiments.

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