A device and method for in-situ hydrogen generation

Abstract

The application discloses a device and a method for in-situ hydrogen production, the device comprising: a coal powder compaction unit for uniformly mixing high-purity quicklime powder with coal powder, compacting the mixture, and outputting coal blocks according to a predetermined model; a punching unit for punching the coal blocks to obtain at least one horizontal through hole and at least one vertical through hole, the horizontal through hole being communicated with the vertical through hole; an injection unit for outputting pre-stored distilled water; a reaction unit for receiving the coal blocks and the distilled water output by the injection unit, reacting in a supercritical state, and outputting reaction products; and a measurement and analysis unit connected with the reaction unit, receiving the reaction products, performing component analysis, and outputting component parameters. The high-purity quicklime powder is uniformly mixed with the coal powder, the mixture is compacted, the coal blocks are output, the horizontal and vertical through holes are punched and communicated, distilled water is introduced, and the reaction is performed in a supercritical state, and the reaction products are analyzed, so that the experimental precision is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrogen production, in particular to a device and method for in-situ hydrogen production. BACKGROUND

[0002] Coal is the basic energy and important raw material in China, and in the primary energy structure of China, coal will be the main energy for a long time. The existing coal is mainly mined underground, and then is used for power generation or long-distance transportation. Even though the level of technology is continuously improving, the environment is still greatly polluted.

[0003] Since the underground coal gasification can realize the in-situ clean conversion of coal seams, it has the technical advantages of good safety, low investment, high efficiency, and less pollution. After underground coal gasification, synthetic gas mainly composed of carbon monoxide, hydrogen, water, carbon dioxide and the like is obtained. The content ratio of the gas composition is controlled by conditions such as temperature, pressure and gasifying agent. The hydrogen content in the synthetic gas produced by dry pulverized coal gasification is usually not higher than 30%. The hydrogen content in the synthetic gas is low. In addition, the production of toxic and harmful gases such as carbon monoxide and carbon dioxide also pollutes the environment and increases carbon emissions.

[0004] At present, the domestic and foreign coal-to-hydrogen technology mainly uses oxygen carriers to purify gas, captures carbon dioxide by calcium-based adsorbents, and selectively permeates membranes to increase the hydrogen content. There are also new coal gasification devices and design methods for adapting to the chemical conversion of coal seams to improve the hydrogen production efficiency. The above methods can relatively increase the hydrogen content, but have the following problems:

[0005] 1) The gasification device using calcium-based adsorbents to capture carbon dioxide has a complex structure, low reaction intensity, and low overall thermal efficiency. The hydrogen production device using selective permeation membranes also has the problem of low gasification intensity. The hydrogen separation membrane material requires strictness under high temperature and high pressure. The economic efficiency of the gasification device combined with the oxygen carrier is poor, and the hydrogen production efficiency is low.

[0006] 2) The relatively complex gasification device cannot be effectively and accurately controlled, and the experimental conditions are more severe. Changing the channel arrangement requires high experimental operation process, and the reaction process cannot be effectively monitored, so the controllability is low. SUMMARY

[0007] The purpose of the present application is to provide a device and method for in-situ hydrogen production, which can collect the volume of gas during the physical simulation experiment, accurately measure the output gas, and test and analyze the components and content, thereby further improving the accuracy of the experiment.

[0008] To solve the above technical problems, an embodiment of the present application provides a device for in-situ hydrogen production, comprising:

[0009] A coal powder compaction unit is used to uniformly mix high-purity quicklime powder with coal powder, compact the mixture, and output coal blocks according to a predetermined model.

[0010] A punching unit is used to punch the coal blocks to obtain at least one horizontal through hole and at least one vertical through hole, and the horizontal through hole communicates with the horizontal through hole.

[0011] An injection unit is used to output pre-stored distilled water.

[0012] A reaction unit is used to receive the coal blocks and the distilled water output by the injection unit, and perform a reaction in a supercritical state to output a reaction product.

[0013] A measurement and analysis unit is connected to the reaction unit, receives the reaction product, performs component analysis, and outputs a component parameter.

[0014] The temperature control unit connected to the reaction unit is used to detect and control the temperature of the reaction unit.

[0015] The coal block model control unit is arranged in the coal powder compaction unit to control the parameters of the coal blocks.

[0016] The measurement and analysis unit includes a flow meter, a gas meter, a gas chromatograph, a mass spectrometer, a 3D scanner, an elemental analyzer, and a scanning electron microscope.

[0017] The temperature control unit includes a PC controller, a temperature sensor, and a pressure sensor.

[0018] The injection unit includes an injection pump, an intermediate container, and a high-precision liquid meter. The injection pump controls the output of distilled water in the intermediate container to the high-precision liquid meter, and accurately controls the output of distilled water from the high-precision liquid meter to the reaction unit.

[0019] The reaction unit includes a high-temperature and high-pressure reaction kettle, and a temperature probe, a heating belt, and a heat insulation layer arranged in the high-temperature and high-pressure reaction kettle. The heating belt is used to carry and heat the coal blocks, the heat insulation layer is used to insulate the inside and outside of the high-temperature and high-pressure reaction kettle, and the temperature probe is used to detect the temperature information of the coal blocks.

[0020] The display connected to the coal powder compaction unit, the punching unit, the injection unit, the reaction unit, and the measurement and analysis unit is used to display the state parameters of the coal powder compaction unit, the punching unit, the injection unit, the reaction unit, and the measurement and analysis unit.

[0021] In addition, the embodiment of the present application also provides a method for in-situ hydrogen production, comprising:

[0022] After uniformly mixing the high-purity quicklime powder with the coal powder and compacting, output the coal block according to a predetermined model;

[0023] Punch holes in the coal block to obtain at least one horizontal through hole and at least one vertical through hole, and the horizontal through hole is communicated with the vertical through hole;

[0024] Put the coal block into a reaction kettle and introduce distilled water to react in a supercritical state, and output the reaction product;

[0025] Analyze the components of the reaction product and output the component parameters.

[0026] The coal block is a cylindrical coal block with a diameter of 6-8 cm and a length of 8-10 cm, the width of the horizontal through hole is 2-2.5 cm, and the width of the vertical through hole is 2-2.5 cm.

[0027] Compared with the prior art, the device and method for in-situ hydrogen production provided by the embodiment of the present application have the following advantages:

[0028] The device and method for in-situ hydrogen production, by uniformly mixing high-purity quicklime powder with coal powder, compacting, and then outputting the coal block, punching holes horizontally and vertically and communicating, introducing distilled water to react in a supercritical state, and analyzing the reaction product, improve the experimental precision, since the volume of the gas in the physical simulation experiment can be collected at the same time, the output gas can be accurately measured, and its components and content can be tested and analyzed, further improving the experimental precision. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0030] Figure 1 The structure schematic diagram of one embodiment of the device for in-situ hydrogen production provided by the embodiment of the present application;

[0031] Figure 2 The connection structure schematic diagram of one embodiment of the device for in-situ hydrogen production provided by the embodiment of the present application;

[0032] Figure 3 The step flow schematic diagram of one embodiment of the method for in-situ hydrogen production provided by the embodiment of the present application. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0034] Reference is made to Figures 1-3 , Figure 1 A structural schematic diagram of one embodiment of the device for in-situ hydrogen production provided by the embodiments of the present application is shown in the figure. Figure 2 A connection structural schematic diagram of one embodiment of the device for in-situ hydrogen production provided by the embodiments of the present application is shown in the figure. Figure 3 A step flow schematic diagram of one embodiment of the method for in-situ hydrogen production provided by the embodiments of the present application is shown in the figure.

[0035] In one specific embodiment, the device for in-situ hydrogen production comprises:

[0036] A coal powder compaction unit 10 is configured to uniformly mix high-purity quicklime powder with coal powder, compact the mixture, and output coal blocks according to a predetermined model;

[0037] A punching unit 20 is configured to punch the coal blocks to obtain at least one horizontal through hole and at least one vertical through hole, and the horizontal through hole is in communication with the vertical through hole;

[0038] An injection unit 30 is configured to output pre-stored distilled water;

[0039] A reaction unit 40 is configured to receive the coal blocks and the distilled water output by the injection unit 30, and perform a reaction in a supercritical state, and output a reaction product;

[0040] A measurement and analysis unit 50 is connected to the reaction unit 40, receives the reaction product, and performs component analysis, and outputs a component parameter.

[0041] By uniformly mixing high-purity quicklime powder with coal powder, compacting the mixture, and outputting coal blocks, and then horizontally and vertically punching and communicating the coal blocks, and introducing distilled water to perform a reaction in a supercritical state, and analyzing the reaction product, the experimental precision is improved. Since the volume of gas in the physical simulation experiment process can be collected at the same time, the output gas can be accurately metered, and its components and content can be tested and analyzed, the experimental precision is further improved.

[0042] In order to further improve the control of the reaction, ensure the safety and reliability of the operation of the device, in an embodiment, the in-situ hydrogen production device further comprises a temperature control unit connected with the reaction unit 40, for detecting and controlling the temperature of the reaction unit 40.

[0043] By using the temperature control unit to detect and control the temperature of the reaction unit 40, the temperature of the reaction unit 40 is detected and controlled in real time, and the reliability of the operation is improved.

[0044] The application does not limit the heating method and temperature detection method of the temperature control unit.

[0045] The processing object in the application is coal blocks, and the size and shape thereof are not limited, and in an embodiment, the in-situ hydrogen production device further comprises a coal block model control unit arranged in the coal powder compaction unit 10 for controlling the parameters of the coal blocks.

[0046] Through the coal block model control unit, the parameters of the coal blocks can be controlled, such as the control of different shapes and sizes, different numbers of horizontal channels and vertical channels, etc., so as to realize the optimized hydrogen production structure.

[0047] The application does not limit the control of the parameters of the coal blocks, which can be directly selected by using preset parameters, or can be input on site by using an input device.

[0048] The coal block model control unit in the application can also be on-site control input or remote input control.

[0049] The application does not limit the type of measurement parameters of the measurement and analysis unit, and in an embodiment, the measurement and analysis unit 50 comprises a flow meter 51, a gas meter 52, a gas chromatograph 53, a mass spectrometer, a 3D scanner 56, an elemental analyzer 54 and a scanning electron microscope 55.

[0050] It should be noted that the application does not limit the instruments included in the measurement and analysis unit, and the instruments can be appropriately increased or reduced according to requirements.

[0051] The application does not limit the structure of the temperature control unit, and in order to improve the control efficiency, in an embodiment, the temperature control unit comprises a PC controller, a temperature sensor and a pressure sensor.

[0052] The PC controller can control the entering rate of the material, the temperature sensor and the pressure sensor can detect the temperature and pressure of the reaction unit 40 in real time, and the control of the reaction process, such as the control of the heating power, can be realized according to the temperature and pressure, so as to improve the safety and reliability of the reaction process.

[0053] The injection unit 30 is used to inject raw materials and materials in the application, and the structure and raw material injection method are not limited.

[0054] In order to improve the accuracy of material injection, in an embodiment, the injection unit 30 includes an injection pump 31, an intermediate container 32, and a high-precision liquid meter 33. The injection pump 31 controls the output of distilled water in the intermediate container 32 to the high-precision liquid meter 33 and accurately controls the output of distilled water from the high-precision liquid meter 33 to the reaction unit 40.

[0055] Through the intermediate container 32 and the high-precision liquid meter 33, distilled water is first stored in the intermediate container 32 to ensure sufficient material for subsequent reactions, and then the precision liquid meter 33 is used to accurately control the amount of distilled water injected each time, improving the accuracy of reaction control.

[0056] The reaction unit 40 is used for material reaction in the application, and the structure and size of the reaction unit 40 are not limited in the application. In an embodiment, the reaction unit 40 includes a high-temperature and high-pressure reaction kettle 41, a temperature probe 42, a heating belt 43, and a heat insulation layer 44 arranged in the high-temperature and high-pressure reaction kettle 41. The heating belt 43 is used to carry and heat the coal blocks, the heat insulation layer 44 is used to insulate the inside and outside of the high-temperature and high-pressure reaction kettle, and the temperature probe 42 is used to detect the temperature information of the coal blocks.

[0057] The application includes but is not limited to the above-mentioned structure.

[0058] The high-temperature and high-pressure reaction kettle 41 can be a cylindrical tube, a cuboid, or the like, and can be made of ceramic or alloy.

[0059] In order to further improve the control of the reaction and analysis and measurement, in an embodiment, the in-situ hydrogen production device further includes a display connected to the coal powder compaction unit 10, the punching unit 20, the injection unit 30, the reaction unit 40, and the measurement and analysis unit 50, for displaying the state parameters of the coal powder compaction unit 10, the punching unit 20, the injection unit 30, the reaction unit 40, and the measurement and analysis unit 50.

[0060] The display of the state parameters of the coal powder compaction unit 10, the punching unit 20, the injection unit 30, the reaction unit 40, and the measurement and analysis unit 50 improves the control of the reaction process and improves the control efficiency and management efficiency.

[0061] In addition, the embodiment of the application also provides a method for in-situ hydrogen production, comprising:

[0062] S1, uniformly mixing high-purity lime powder with coal powder, compacting, and outputting coal briquettes according to a predetermined model;

[0063] S2, drilling the coal briquettes to obtain at least one horizontal through hole and at least one vertical through hole, the horizontal through hole being in communication with the vertical through hole;

[0064] S3, placing the coal briquettes into a reaction kettle and introducing distilled water to react in a supercritical state, and outputting reaction products;

[0065] S4, analyzing components of the reaction products and outputting component parameters.

[0066] The method for in-situ hydrogen production has the same beneficial effects as the in-situ hydrogen production device, and thus will not be described herein.

[0067] The size of the coal briquettes and the reaction size are not limited, and the coal briquettes are generally cylindrical, with a diameter of 6-8 cm and a length of 8-10 cm, the width of the horizontal through hole is 2-2.5 cm, and the width of the vertical through hole is 2-2.5 cm.

[0068] In one embodiment, the coal powder is placed in an intermediate container, the high-purity lime powder is placed in the intermediate container, the valve is opened to pour the coal powder and the lime powder into a coal ball compaction device, the coal powder and the lime powder are compacted into a cylindrical coal ball model, and a hole is drilled in the coal ball model, one horizontal and one vertical, and kept in communication, and the valve is closed after being placed in a high-temperature and high-pressure reaction kettle.

[0069] The high-temperature and high-pressure reaction kettle is externally heated, and the temperature can be automatically adjusted to the experimental temperature by a PC controller. The distilled water is placed in an intermediate container, the valve is opened, and the multifunctional control pump is opened at the same time, the distilled water in the intermediate container is pumped into the high-temperature and high-pressure reaction kettle at a rate of 0.1 ml / min, the volume of the distilled water pumped in is recorded by a flowmeter, and the valve is closed at the same time, the pressure change in the reaction kettle is observed by a pressure gauge, the temperature and pressure in the reaction kettle are controlled by a PC controller, and when the distilled water in the high-temperature and high-pressure reaction kettle reaches a supercritical state (374.3℃, 22.1MPa).

[0070] Continue to increase the temperature to make the coal seam fully react with supercritical water, and during the reaction process, the 3D scanner is used to collect the three-dimensional mapping images of the empty area of the coal ball model. After the reaction is completed, the high-temperature and high-pressure reactor is cooled to room temperature, the valve and the valve are opened, the synthesis gas is recorded by the gas meter, and then enters the intermediate container for collection. The composition and content of the synthesis gas are tested by the gas chromatograph and mass spectrometer, and the content of hydrogen is recorded. The solid residue after reaction is obtained by cleaning the coal ball model after reaction, and is collected into the intermediate container. The elemental composition and surface element distribution image of the solid residue are tested by the elemental analyzer, and the surface microstructure of the solid residue is tested by the scanning electron microscope. Repetitive experiments can be performed to test the variation characteristics of the hydrogen content in the synthesis gas after multiple reactions, and the expansion law of the empty area of the coal ball model and the physical and chemical properties of the reaction solid product are studied.

[0071] The device and method of the present application promote the conversion of hydrogen in the supercritical water gasification process of underground coal seams by using alkaline catalysts, absorb carbon monoxide and carbon dioxide in the synthesis gas, reduce carbon emissions to pollute the environment, increase the content of hydrogen, and promote the conversion of green energy. Scientific analysis of the expansion law of the empty area of the gasification process and the physical and chemical properties of the solid product ensures the rigor and accuracy of the experiment; the alkaline catalyst, lime, has low economic cost and is easy to implement, and the experimental process embodies the effects of high efficiency, greenness and environmental protection.

[0072] In summary, the device and method for in-situ hydrogen production provided by the embodiments of the present application mix high-purity lime powder and coal powder uniformly, compact the mixture, output coal blocks, and then punch holes horizontally and vertically and connect them, and then introduce distilled water in a supercritical state to react, analyze the reaction products, and improve the experimental precision. Since the volume of the gas in the physical simulation experiment can be collected at the same time, the output gas can be accurately metered, and its composition and content can be tested and analyzed, further improving the accuracy of the experiment.

[0073] The device and method for in-situ hydrogen production provided by the present application are described in detail above. Specific examples are used in this paper to explain the principles and implementation methods of the present application. The above description of the embodiments is only used to help understand the method and its core idea. It should be noted that those skilled in the art can make some improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A device for in-situ hydrogen generation, characterized in that, The device comprises: a coal powder compaction unit for uniformly mixing high-purity quicklime powder with coal powder, compacting the mixture, and outputting coal blocks according to a predetermined model; a punching unit for punching the coal blocks to obtain at least one horizontal through hole and at least one vertical through hole, the horizontal through hole being in communication with the vertical through hole; an injection unit for outputting pre-stored distilled water; a reaction unit for receiving the coal blocks and the distilled water output by the injection unit, reacting in a supercritical state, and outputting reaction products; a measurement and analysis unit connected to the reaction unit, receiving the reaction products, and performing component analysis and outputting component parameters; a temperature control unit connected to the reaction unit for detecting and controlling the temperature of the reaction unit; a coal block model control unit provided in the coal powder compaction unit for controlling the parameters of the coal blocks; the measurement and analysis unit comprises a flow meter, a gas meter, a gas chromatograph, a mass spectrometer, a 3D scanner, an elemental analyzer, and a scanning electron microscope; the temperature control unit comprises a PC controller, a temperature sensor, and a pressure sensor; the injection unit comprises an injection pump, an intermediate container, and a high-precision liquid meter, the injection pump controls the output of distilled water in the intermediate container to the high-precision liquid meter, and accurately controls the output of distilled water from the high-precision liquid meter to the reaction unit; the reaction unit comprises a high-temperature and high-pressure reaction kettle, and a temperature probe, a heating belt, and a heat insulation layer provided in the high-temperature and high-pressure reaction kettle, the heating belt is used for carrying and heating the coal blocks, the heat insulation layer insulates the inside and outside of the high-temperature and high-pressure reaction kettle, and the temperature probe is used for detecting the temperature information of the coal blocks.

2. The apparatus for in-situ hydrogen generation as claimed in claim 1 wherein, a display connected to the coal powder compaction unit, the punching unit, the injection unit, the reaction unit, and the measurement and analysis unit for displaying the state parameters of the coal powder compaction unit, the punching unit, the injection unit, the reaction unit, and the measurement and analysis unit.

3. A method of producing hydrogen in situ, characterized by, The device for in-situ hydrogen production according to any one of claims 1-2 comprises: uniformly mixing high-purity quicklime powder with coal powder, compacting the mixture, and outputting coal blocks according to a predetermined model; punching the coal blocks to obtain at least one horizontal through hole and at least one vertical through hole, the horizontal through hole being in communication with the vertical through hole; putting the coal blocks into a reaction kettle and introducing distilled water to react in a supercritical state, and outputting reaction products; performing component analysis on the reaction products and outputting component parameters.

4. The method of claim 3, wherein the hydrogen is produced in situ. The coal blocks are cylindrical coal blocks with a diameter of 6-8 cm and a length of 8-10 cm, the width of the horizontal through hole is 2-2.5 cm, and the width of the vertical through hole is 2-2.5 cm.

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