Plasma synergistic catalyst assisted n-heptane reforming experiment platform and method

Abstract

The invention discloses a plasma synergistic catalyst assisted n-heptane reforming experiment platform and method. The platform comprises a fuel supply system, a heating system, a reaction system, a power supply system and a product detection system. The fuel supply system is used for providing chromatographic-grade high-purity n-heptane liquid and diluent gas and adjusting the pressure in the reactor; the heating system ensures that n-heptane is completely gasified, and liquid substances are prevented from blocking a pipeline; the reaction system generates uniform non-equilibrium plasma through a double-layer dielectric barrier discharge structure, and the uniform non-equilibrium plasma and the catalyst form a synergistic effect; the power supply system provides a stable electric field; the product detection system is combined with gas chromatography and mass spectrometry technologies to qualitatively and quantitatively analyze reaction products and diagnose microscopic components. The experimental device supports experimental research under three working conditions of'catalyst ', 'plasma' and'catalyst and plasma ', and is beneficial to exploring the influence of different working conditions on the reforming reaction activity of n-heptane and the synergistic effect between the catalyst and the plasma.

Description

Technical Field

[0001] The present invention belongs to the technical field of n-heptane reforming, and particularly relates to an experimental platform and method for n-heptane reforming assisted by plasma and catalyst. Background Art

[0002] N-heptane reforming is an important reaction in the conversion process of liquid hydrocarbon fuels, and is widely used in fields such as petrochemical industry, syngas production, and biomass conversion. Traditional n-heptane reforming methods, such as catalytic reforming, usually need to be carried out under high temperature and high pressure conditions. This not only increases the operating cost of the equipment, but also has very strict requirements for the catalyst. Although catalysts (such as Pt, Ni-based catalysts) can promote the cracking and isomerization reactions of n-heptane, the catalyst is easily deactivated in a high temperature environment, resulting in a decrease in reaction efficiency. At the same time, the catalyst needs to be replaced frequently, increasing the production cost. In addition, the formation of by-products in the traditional reforming process is relatively complex and difficult to control, and some by-products (such as olefins, coke, etc.) may have an adverse impact on subsequent reactions, reducing the fuel quality and yield.

[0003] With the improvement of environmental protection requirements, the traditional reforming process also faces large energy consumption and carbon emission problems, and there is an urgent need to develop more efficient and low-carbon fuel production technologies. In recent years, as an emerging reaction promotion means, plasma technology has been widely used in catalytic reactions because it can provide high-energy free radicals and active particles, and can effectively promote the cracking of reactants. However, the application of existing plasma technology in n-heptane reforming still faces problems such as low energy efficiency, long reaction time, and insufficient energy utilization.

[0004] The plasma-catalyst reaction technology is an interdisciplinary innovative technology that combines plasma technology and catalytic technology. The former belongs to the field of power engineering and engineering thermophysics, while the latter belongs to the field of chemical engineering technology. On the surface, this technology seems to be just a simple superposition of the two technologies, but in fact, through careful design and optimization, it gives full play to the synergistic effect of the two. Plasma technology improves the reaction rate and selectivity by exciting active particles, while catalytic technology improves the reaction efficiency by reducing the reaction energy barrier. The combination of the two is not a simple repetition, but through mutual interaction, it promotes the efficient progress of the reaction, showing better performance than using any one of the technologies alone. Therefore, how to improve the reaction efficiency, reduce energy loss, and reduce the generation of by-products through the synergistic effect of plasma and catalyst has become a research hotspot. Summary of the Invention

[0005] The object of the present invention is to provide a plasma-assisted catalyst n-heptane reforming experimental platform and method, which optimize the reaction conditions by precisely controlling key variables such as the catalyst, power supply parameters, reaction temperature, and residence time. During the n-heptane reforming process, the platform can monitor and analyze intermediate products in real time, providing important experimental basis for in-depth study of the chemical reaction kinetics and reaction mechanism of plasma-assisted catalyst n-heptane reforming, and promoting the theoretical development in this field.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A plasma-assisted catalyst n-heptane reforming experimental platform, comprising a fuel supply system, a heating system, a reaction system, a power supply system, and a product detection system; The fuel supply system is used to provide chromatographic-grade high-purity n-heptane liquid and supply the required dilution gas. During the experiment, the fuel supply system can control the pressure in the reaction system and discharge the gas generated during the reaction. The heating system is used to ensure that the n-heptane in the entire pipeline can be completely vaporized and prevent possible liquid substances from blocking the pipeline. The reaction system is used to provide a temperature-controlled reaction zone for the n-heptane reforming reaction. At the same time, a catalyst is filled between the discharge structures of the reaction system. The reaction system includes a double-layer dielectric barrier discharge structure for generating uniform non-equilibrium plasma. The power supply system is used to provide a stable electric field to generate plasma and monitor the voltage and current during the discharge process in real time to ensure the continuous generation of non-equilibrium plasma during the reaction process. The product detection system is used to collect the reaction products and conduct qualitative and quantitative analysis on them to achieve precise diagnosis and comprehensive analysis of the microscopic components during the n-heptane reforming process.

[0007] A further improvement of the present invention is that the fuel supply system includes reaction gas, n-heptane liquid fuel, a liquid injection pump, a mass flow meter, a flow meter controller, a micro-regulating valve, and an electronic pressure gauge; The reaction gas is connected to a stainless steel pipe through a mass flow meter, and the gas flow is regulated by the mass flow meter to ensure that the flow rate when it enters the system is appropriate; the mass flow meter is powered by the flow meter controller, which monitors and adjusts the gas flow in real time to meet the experimental requirements; the n-heptane liquid fuel controls the amount entering the vaporization tank through the liquid injection pump; the liquid injection pump can ensure the supply of n-heptane to ensure the stable supply of fuel during the experiment; the micro-regulating valve is used to adjust the gas discharge amount to maintain the air pressure stability of the system and prevent the influence of pressure fluctuations on the experimental results; the electronic pressure gauge continuously monitors the pressure in the reaction system to ensure that the pressure remains within the set safety range to ensure the stability and repeatability of the experiment.

[0008] A further improvement of the present invention lies in that the heating system includes a vaporization tank, a thermocouple, a temperature controller, a heating tape, and an electric heating furnace; The n-heptane liquid fuel is fed into the vaporization tank through a liquid injection pump; the entire pipeline is heated by the heating tape to ensure that the temperature inside the fuel pipeline is appropriate, preventing the liquid fuel from freezing or having other adverse reactions in the pipeline; the thermocouple and the temperature controller work in cooperation, where the thermocouple monitors the temperature change in real time, and the temperature controller adjusts according to the monitored temperature to maintain the stable temperature of the system; the electric heating furnace provides a constant and adjustable temperature control environment for the entire reaction system, supporting the temperature requirements under various experimental conditions and ensuring the temperature control during the reaction process.

[0009] A further improvement of the present invention lies in that steel balls are arranged inside the vaporization tank to increase the heat exchange area and ensure the uniform mixing of gas and liquid fuel.

[0010] A further improvement of the present invention lies in that the electric heating furnace provides an initial temperature condition of 298K - 1473K for the reaction.

[0011] A further improvement of the present invention lies in that the reaction system includes a sealing flange, an outer quartz flow tube, an external copper ring electrode, an internal stainless steel electrode, an inner quartz tube, a catalyst, and a fixing device; The entire reaction system is placed in the electric heating furnace to ensure that the reaction process is carried out in a stable temperature control environment; both ends of the reaction system are sealed by the sealing flange to prevent gas leakage and ensure that the pressure and temperature inside the reaction system are maintained within a preset range; the external copper ring electrode, the outer quartz flow tube, the internal stainless steel electrode, and the inner quartz tube form the electrode structure of the reaction system to ensure the coaxiality of the system and the precise docking between the electrodes; inside the plasma discharge area, the catalyst and the fixing device are fixed by high-temperature-resistant quartz wool; there are central holes on both sides of the sealing flange to lead out the internal stainless steel electrode and connect it to the power supply, and at the same time, exhaust holes are provided at the gas outlet end to ensure that the gas generated by the reaction can be effectively discharged, preventing excessive gas accumulation from affecting the reaction process.

[0012] A further improvement of the present invention lies in that the outer quartz flow tube has a double-layer dielectric barrier discharge structure, which can generate a more uniform discharge electric field.

[0013] A further improvement of the present invention lies in that the power supply system includes an oscilloscope, a high-voltage power supply, a voltage regulator, a voltage probe, and a current monitoring loop; The positive and negative electrodes of the high-voltage power supply are respectively connected to the external copper ring electrode and the internal stainless-steel electrode to provide the voltage and current required for discharge, supporting plasma discharges generated by AC power supplies and pulsed power supplies; the voltage regulator is used to adjust the discharge voltage, and its output voltage is adjusted by rotation to control the intensity and stability of the discharge; the voltage probe and current monitoring ring are used to monitor the voltage and current fluctuations during the discharge process in real time to ensure the stability and controllability of the discharge process; all monitoring data are displayed in real time through an oscilloscope.

[0014] A further improvement of the present invention lies in that the product detection system includes a gas chromatography / mass spectrometry (GC / MS) instrument, a gas chromatograph, and a computer controller; The reaction products are processed by two-way shunting. One part enters the gas chromatograph for the detection of inorganic compounds, and the other part is analyzed for organic compounds by the gas chromatography / mass spectrometry (GC / MS) instrument; the gas chromatograph can separate and detect inorganic components, while the gas chromatography / mass spectrometry (GC / MS) instrument combines the advantages of gas chromatography and mass spectrometry analysis and can accurately identify the structure and quality of organic compounds; the computer controller is responsible for automatically analyzing all detection data, displaying the differential diagnosis results of the experiment in real time, and generating a detailed analysis report to ensure the accuracy and comprehensiveness of the data.

[0015] An experimental method for n-heptane reforming assisted by plasma and catalyst includes: The fuel supply system provides chromatographically pure high-purity n-heptane liquid and supplies the required dilution gas. During the experiment, the fuel supply system controls the pressure within the reaction system and discharges the gases generated during the reaction. The heating system ensures that the n-heptane in the entire pipeline can be completely vaporized and prevents possible liquid substances from blocking the pipeline. The reaction system provides a temperature-controlled reaction zone for the n-heptane reforming reaction. At the same time, a catalyst is filled between the discharge structures of the reaction system. The reaction system includes a double-layer dielectric barrier discharge structure that generates a uniform non-equilibrium plasma. The power supply system provides a stable electric field to generate plasma and monitors the voltage and current during the discharge process in real time to ensure the continuous generation of non-equilibrium plasma during the reaction process. The product detection system collects the reaction products and conducts qualitative and quantitative analysis on them to achieve precise diagnosis and comprehensive analysis of the microscopic components during the n-heptane reforming process.

[0016] Compared with the prior art, the present invention has at least the following beneficial technical effects: 1. An experimental platform and method for n - heptane reforming with a plasma - assisted catalyst provided by the present invention support experimental studies under three working conditions: "catalyst", "plasma", and "catalyst + plasma". This platform helps to study the influence of different working conditions on the reaction activity of n - heptane reforming and explore the synergistic effect between "catalyst" and "plasma". 2. The double - layer dielectric barrier discharge system of the present invention can generate non - equilibrium plasma with high energy density, avoid the formation of thermal plasma, and effectively improve the uniformity of discharge, thus ensuring the stability and efficiency of the plasma. 3. The dielectric barrier discharge reaction zone of the present invention has good versatility and can be compatible with a variety of catalysts, broadening the application scope of experimental research. 4. The present invention provides a wide initial temperature adjustment range through electric furnace heating, meeting the requirements under different reaction conditions and ensuring the diversity and stability of experimental conditions. 5. The experimental platform of the present invention is not limited by the discharge mode of the high - voltage power supply and supports multiple power supply modes, including high - voltage alternating current and high - voltage nanosecond pulse power supply, etc., providing more flexibility and adaptability for experiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 FIG. is a schematic structural diagram of an experimental platform for n - heptane reforming assisted by a plasma - assisted catalyst of the present invention.

[0019] Figure 2 FIG. is a partial cross - sectional view of the discharge region of the double - layer dielectric barrier discharge structure with a synergistic catalyst.

[0020] Figure 3 FIG. is a left - hand cross - sectional view of the double - layer dielectric barrier discharge structure.

[0021] DESCRIPTION OF THE REFERENCE NUMERALS: 1 - Reaction gas, 2 - n - heptane liquid fuel, 3 - Liquid injection pump, 4 - Mass flowmeter, 5 - Flowmeter controller, 6 - Micro regulating valve, 7 - Electronic pressure gauge, 8 - Vaporization tank, 9 - Thermocouple and temperature controller, 10 - Heating tape, 11 - Electric heating furnace, 12 - Sealing flange, 13 - Outer quartz flow tube, 14 - External copper ring electrode, 15 - Internal stainless - steel electrode, 16 - Inner quartz tube, 17 - Catalyst and fixing device, 18 - Oscilloscope, 19 - High - voltage power supply, 20 - Voltage regulator, 21 - Voltage probe, 22 - Current monitoring loop, 23 - Gas chromatography / mass spectrometry, 24 - Gas chromatograph, 25 - Computer controller. Detailed implementation manners

[0022] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present invention. Therefore, the drawings and the description are regarded as being exemplary rather than restrictive.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0024] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0025] In the present invention, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In the present invention, unless otherwise clearly specified or limited, the first feature being “on” or “under” the second feature may include direct contact between the first and second features, or may include contact between the first and second features not directly but through additional features therebetween. Moreover, the first feature being “above”, “over” and “on top of” the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being “under”, “beneath” and “underneath” the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0027] It should also be understood that the terms used in the description of the present invention are merely for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the description of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms “a”, “an” and “the” are intended to include the plural forms.

[0028] It should be further understood that the term “and / or” used in the description of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0029] Schematic diagrams of various structures according to the disclosed embodiments of the present invention are shown in the drawings. These figures are not drawn to scale, where for the purpose of clear illustration, some details are enlarged and some details may be omitted. The shapes of the various regions and layers shown in the figures and their relative sizes and positional relationships are merely exemplary, and may actually deviate due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes and relative positions according to actual needs.

[0030] The embodiments of the present invention will be described in detail below with reference to the drawings.

[0031] Embodiment 1 As Figures 1 to 3As shown, the plasma-assisted catalyst-assisted n-heptane reforming experimental platform provided by the present invention includes a fuel supply system, a heating system, a reaction system, a power supply system and a product detection system. Among them, the fuel supply system is mainly composed of a reaction gas 1, a n-heptane liquid fuel 2, a liquid injection pump 3, a mass flow meter 4, a flow meter controller 5, a micro-regulating valve 6, and an electronic pressure gauge 7; the heating system is mainly composed of a vaporizer 8, a thermocouple and a temperature controller 9, a heating belt 10, and an electric heating furnace 11; the reaction system is mainly composed of a sealing flange 12, an outer quartz flow tube 13, an external copper ring electrode 14, a built-in stainless steel electrode 15, an inner quartz tube 16, and a catalyst and a fixing device 17; the power supply system is mainly composed of an oscilloscope 18, a high-voltage power supply 19, a voltage regulator 20, a voltage probe 21, and a current monitoring ring 22; the product detection system is mainly composed of a gas chromatograph / mass spectrometer 23, a gas chromatograph 24, and a computer controller 25.

[0032] The fuel supply system includes a reaction gas 1, n-heptane liquid fuel 2, a liquid injection pump 3, a mass flow meter 4, a flow meter controller 5, a micro-regulating valve 6 and an electronic pressure gauge 7.

[0033] The reaction gas 1 is connected to the stainless steel pipe through the mass flow meter 4, and the gas flow is accurately adjusted by the mass flow meter 4 to ensure that the flow rate when it enters the system is controllable. The mass flow meter 4 is powered by the flow meter controller 5, which monitors the gas flow in real time and adjusts it to meet the experimental requirements. The amount of n-heptane liquid fuel 2 entering the vaporizer 8 is accurately controlled by the liquid injection pump 3. The liquid injection pump 3 can ensure the accurate supply of n-heptane to ensure a stable supply of fuel in the experiment. The micro-regulating valve 6 is used to adjust the gas discharge to maintain the stability of the system's air pressure and prevent pressure fluctuations from affecting the experimental results. The electronic pressure gauge 7 continuously monitors the pressure in the reaction system to ensure that the pressure remains within the set safety range to ensure the stability and repeatability of the experiment.

[0034] The heating system includes a vaporizer 8, a thermocouple and a temperature controller 9, a heating belt 10, and an electric heating furnace 11; The n-heptane liquid fuel 2 is fed into the vaporizer 8 through the liquid injection pump 3. The steel balls in the vaporizer increase the heat exchange area, which can not only promote the evaporation of n-heptane, but also help the carrier gas to fully mix with the vaporized fuel, ensuring the uniform mixing of the gas and liquid fuel. The entire pipeline is heated by the heating belt 10 to ensure that the temperature in the fuel pipeline is appropriate to prevent the liquid fuel from freezing in the pipeline or other adverse reactions. The thermocouple and the temperature controller 9 work together. The thermocouple monitors the temperature change in real time, and the temperature controller adjusts according to the monitored temperature to maintain a stable temperature of the system. The electric heating furnace 11 provides a constant and adjustable temperature control environment for the entire reaction system, supports the temperature requirements under various experimental conditions, and ensures accurate control of the temperature during the reaction process.

[0035] The reaction system includes a sealed flange 12, an outer quartz flow tube 13, an external copper ring electrode 14, an internal stainless-steel electrode 15, an inner quartz tube 16, a catalyst and a fixing device 17.

[0036] The reactor is placed in an electric heating furnace 11 to ensure that the reaction process takes place in a stable temperature-controlled environment. Both ends of the reaction structure are sealed by the sealed flange 12 to prevent gas leakage and ensure that the pressure and temperature inside the reactor are maintained within a preset range. The external copper ring electrode 14, the outer quartz flow tube 13, the internal stainless-steel electrode 15 and the inner quartz tube 16 form the electrode structure of the reactor, ensuring the coaxiality of the system and the precise docking between the electrodes. Through the double-layer dielectric barrier discharge system, non-equilibrium plasma is uniformly generated between the two quartz tubes, avoiding the formation of thermal plasma, while increasing the energy density of the plasma, enhancing the reaction efficiency and control accuracy. In the plasma discharge region, the catalyst and the fixing device 17 are fixed by high-temperature-resistant quartz wool and other materials to ensure the stability and high efficiency of the catalyst during the reaction. There are central openings on both sides of the sealed flange 12 to lead out the internal stainless-steel electrode 15 and connect it to the power supply. At the same time, exhaust holes are provided at the gas outlet end to ensure that the gas generated by the reaction can be effectively discharged, preventing excessive gas accumulation from affecting the reaction process.

[0037] The power supply system includes an oscilloscope 18, a high-voltage power supply 19, a voltage regulator 20, a voltage probe 21, and a current monitoring loop 22.

[0038] The positive and negative poles of the high-voltage power supply 19 are respectively connected to the external copper ring electrode 14 and the internal stainless-steel electrode 15 to provide the voltage and current required for discharge. The voltage regulator 20 is used to precisely adjust the discharge voltage. By rotating it, its output voltage can be adjusted to control the intensity and stability of the discharge. The voltage probe 21 and the current monitoring loop 22 are used to monitor the voltage and current fluctuations during the discharge process in real time to ensure the stability and controllability of the discharge process. All monitored data are displayed in real time through the oscilloscope 18, providing accurate electrical parameter feedback for the reaction process, thereby ensuring that the electrical characteristics during the plasma discharge process can be accurately controlled.

[0039] The product detection system includes a gas chromatography / mass spectrometry instrument 23, a gas chromatograph 24, and a computer controller 25.

[0040] The reaction products are processed through two-way shunting. One part enters the gas chromatograph 24 for the detection of inorganic compounds, and the other part is analyzed for organic compounds by the gas chromatography / mass spectrometry (GC / MS) instrument 23. The gas chromatograph 24 can efficiently separate and detect inorganic components, while the GC / MS instrument 23 combines the advantages of gas chromatography and mass spectrometry analysis to accurately identify the structure and mass of organic compounds. The computer controller 25 is responsible for automatically analyzing all the detection data, displaying the differential diagnosis results of the experiment in real time, and generating a detailed analysis report to ensure the accuracy and comprehensiveness of the data.

[0041] Example 2 An experimental method for n-heptane reforming assisted by plasma synergistic catalyst provided by the present invention includes: The fuel supply system provides chromatographically pure high-purity n-heptane liquid and supplies the required dilution gas. During the experiment, the fuel supply system controls the pressure within the reaction system and discharges the gases generated during the reaction. The heating system ensures that the n-heptane in the entire pipeline can be completely vaporized and prevents the possible blockage of the pipeline by liquid substances. The reaction system provides a temperature-controllable reaction zone for the n-heptane reforming reaction. At the same time, a catalyst is filled between the discharge structures of the reaction system. The reaction system includes a double-layer dielectric barrier discharge structure to generate a uniform non-equilibrium plasma. The power supply system provides a stable electric field to generate plasma and monitors the voltage and current during the discharge process in real time to ensure the continuous generation of non-equilibrium plasma during the reaction. The product detection system collects the reaction products and conducts qualitative and quantitative analysis on them to achieve precise diagnosis and comprehensive analysis of the microscopic components during the n-heptane reforming process.

[0042] In this embodiment, the working process is as follows: First, start the electric heating furnace 11 and the heating belt 10 to heat the system to the preset experimental temperature conditions. During this process, the reaction gas 1 enters the system through the mass flowmeter 4 controlled by the flowmeter controller 5 and is mixed with other gases to ensure that the gas flow rate entering the reactor is precisely controllable. At the same time, the n-heptane liquid fuel 2 is precisely controlled by the liquid injection pump 3 to flow into the vaporization tank 8, and the heating belt 10 in the vaporization tank heats the temperature above the boiling point of n-heptane to promote the complete vaporization of the liquid fuel. The evaporated n-heptane gas is merged with other reaction gases into the main gas path and enters the quartz flow tube to ensure the uniform flow of the gas. Then, precisely adjust the air pressure in the reactor through the micro regulating valve 6 to ensure that the system operates under the optimal working conditions. The pressure in the reactor is monitored and displayed in real time by the electronic pressure gauge 7 to ensure that the working pressure of the reactor is always maintained within the set range and to avoid affecting the stability of the reaction due to pressure fluctuations. After the temperature and air pressure conditions are stable, set the frequency and voltage parameters of the high-voltage power supply 19. Then, apply a voltage between the external copper ring electrode 14 and the internal stainless steel electrode 15, and precisely control the magnitude of the discharge voltage through the voltage regulator 20. The voltage and current during the discharge process are monitored in real time through the voltage probe 21 and the current monitoring ring 22 respectively, and are displayed and recorded through the oscilloscope 18 to ensure the stability and controllability of the voltage and current. Once the discharge process is stable, the collected reaction gas is guided to the gas chromatograph 24 and the gas chromatography / mass spectrometry instrument 23 for analysis and detection of the product components. The gas chromatograph 24 is used to detect inorganic compounds, while the gas chromatography / mass spectrometry instrument 23 analyzes the types and contents of organic compounds. All the detection data are analyzed and displayed in real time through the computer controller 25 to generate detailed analysis results of the reaction products. Through in-depth analysis of the experimental result data, the chemical reaction kinetic characteristics of the reforming process of n-heptane under different experimental conditions can be obtained, providing an important experimental basis for further studying the mechanism of the plasma-assisted catalytic reforming reaction of n-heptane.

[0043] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes within the meaning and scope of the equivalent elements of the claims in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0044] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. A plasma-assisted catalyst-assisted n-heptane reforming experimental platform, characterized in that: It includes fuel supply system, heating system, reaction system, power supply system and product detection system; The fuel supply system is used to provide chromatographic grade high-purity n-heptane liquid and the required dilution gas. During the experiment, the fuel supply system can control the pressure in the reaction system and discharge the gas generated during the reaction; A heating system is used to ensure that the n-heptane in the entire pipeline can be completely vaporized and prevent the liquid substances that may be generated from blocking the pipeline; A reaction system for providing a temperature-controllable reaction zone for n-heptane reforming reaction and for filling catalysts between discharge structures of the reaction system, wherein the reaction system includes a double-layer dielectric barrier discharge structure for generating uniform non-equilibrium plasma; The power supply system is used to provide a stable electric field to generate plasma and monitor the voltage and current during the discharge process in real time to ensure that non-equilibrium plasma is continuously generated during the reaction; The product detection system is used to collect reaction products and conduct qualitative and quantitative analysis on them, so as to achieve accurate diagnosis and comprehensive analysis of microscopic components in the n-heptane reforming process.

2. The plasma-assisted catalyst-assisted n-heptane reforming experimental platform according to claim 1, characterized in that: The fuel supply system includes a reaction gas (1), n-heptane liquid fuel (2), a liquid injection pump (3), a mass flow meter (4), a flow meter controller (5), a micro-regulating valve (6) and an electronic pressure gauge (7); The reaction gas (1) is connected to the stainless steel pipe through a mass flow meter (4), and the gas flow rate is adjusted by the mass flow meter (4) to ensure that the gas flow rate when entering the system is stable; the mass flow meter (4) is powered by a flow meter controller (5), and monitors the gas flow rate in real time and makes adjustments to meet the experimental requirements; the amount of n-heptane liquid fuel (2) entering the vaporizer (8) is controlled by a liquid injection pump (3); the liquid injection pump (3) can ensure the supply of n-heptane to ensure a stable supply of fuel during the experiment; the micro-regulating valve (6) is used to adjust the gas discharge to maintain the system's gas pressure stability and prevent pressure fluctuations from affecting the experimental results; the electronic pressure gauge (7) continuously monitors the pressure in the reaction system to ensure that the pressure remains within a set safety range to ensure the stability and repeatability of the experiment.

3. The plasma-assisted catalyst-assisted n-heptane reforming experimental platform according to claim 2 is characterized in that: The heating system comprises a vaporizing tank (8), a thermocouple and a temperature controller (9), a heating belt (10) and an electric heating furnace (11); The n-heptane liquid fuel (2) is delivered to the vaporizer (8) via a liquid injection pump (3); the entire pipeline is heated by a heating belt (10) to ensure that the temperature in the fuel pipeline is appropriate and to prevent the liquid fuel from freezing in the pipeline or causing other adverse reactions; the thermocouple and the temperature controller (9) work together, wherein the thermocouple monitors the temperature change in real time and the temperature controller adjusts according to the monitored temperature to maintain a stable temperature of the system; the electric heating furnace (11) provides a constant and adjustable temperature control environment for the entire reaction system, supports the temperature requirements under various experimental conditions, and ensures the temperature control during the reaction process.

4. The plasma-assisted catalyst-assisted n-heptane reforming experimental platform according to claim 3 is characterized in that: Steel balls are arranged inside the vaporizer (8) to increase the heat exchange area and ensure uniform mixing of the gas and liquid fuel.

5. The plasma-assisted catalyst-assisted n-heptane reforming experimental platform according to claim 3 is characterized in that: The electric heating furnace (11) provides the initial temperature condition of 298K-1473K for the reaction.

6. The plasma-assisted catalyst-assisted n-heptane reforming experimental platform according to claim 3, characterized in that: The reaction system includes a sealing flange (12), an outer quartz flow tube (13), an external copper ring electrode (14), an internal stainless steel electrode (15), an inner quartz tube (16), a catalyst and a fixing device (17); The entire reaction system is placed in an electric heating furnace (11) to ensure that the reaction process is carried out in a stable temperature-controlled environment; both ends of the reaction system are sealed by sealing flanges (12) to prevent gas leakage and ensure that the pressure and temperature inside the reaction system are maintained within a preset range; the external copper ring electrode (14), the outer quartz flow tube (13), the internal stainless steel electrode (15) and the inner quartz tube (16) form the electrode structure of the reaction system to ensure the coaxiality of the system and the precise docking between the electrodes; in the plasma discharge area, the catalyst and the fixing device (17) are fixed by high-temperature resistant quartz wool; the sealing flange (12) has a central opening on both sides to lead out the internal stainless steel electrode (15) and connect it to a power source, and an exhaust hole is set at the gas outlet to ensure that the gas generated by the reaction can be effectively discharged to prevent excessive accumulation of gas and affect the reaction process.

7. The plasma-assisted catalyst-assisted n-heptane reforming experimental platform according to claim 6, characterized in that: The outer quartz flow tube (13) has a double-layer dielectric barrier discharge structure, which can generate a more uniform discharge electric field.

8. The plasma-assisted catalyst-assisted n-heptane reforming experimental platform according to claim 6, characterized in that: The power supply system includes an oscilloscope (18), a high voltage power supply (19), a voltage regulator (20), a voltage probe (21) and a current monitoring loop (22); The positive and negative electrodes of the high-voltage power supply (19) are respectively connected to the external copper ring electrode (14) and the internal stainless steel electrode (15) to provide the voltage and current required for discharge, supporting the plasma discharge generated by the AC power supply and the pulse power supply; the voltage regulator (20) is used to adjust the discharge voltage, and its output voltage is adjusted by rotation to control the intensity and stability of the discharge; the voltage probe (21) and the current monitoring ring (22) are used to monitor the voltage and current fluctuations during the discharge process in real time to ensure the stability and controllability of the discharge process; all monitoring data are displayed in real time through the oscilloscope (18).

9. The plasma-assisted catalyst-assisted n-heptane reforming experimental platform according to claim 8, characterized in that: The product detection system includes a gas chromatograph / mass spectrometer (23), a gas chromatograph (24) and a computer controller (25); The reaction products are processed through two diversions, one of which enters the gas chromatograph (24) for the detection of inorganic compounds, and the other enters the gas chromatography / mass spectrometry (23) for the analysis of organic compounds; the gas chromatograph (24) can separate and detect inorganic components, while the gas chromatography / mass spectrometry (23) combines the advantages of gas chromatography and mass spectrometry and can accurately identify the structure and quality of organic compounds; the computer controller (25) is responsible for the automated analysis of all detection data, real-time display of the differential diagnostic results of the experiment, and generation of a detailed analysis report to ensure the accuracy and comprehensiveness of the data.

10. A plasma-assisted catalyst-assisted n-heptane reforming experimental method, characterized in that: include: The fuel supply system provides chromatographic grade high-purity n-heptane liquid and the required dilution gas. During the experiment, the fuel supply system controls the pressure in the reaction system and discharges the gas generated during the reaction. The heating system ensures that the n-heptane in the entire pipeline can be completely vaporized and prevents the possible generation of liquid substances from blocking the pipeline; The reaction system provides a temperature-controllable reaction zone for the n-heptane reforming reaction, and at the same time fills the catalyst between the discharge structures of the reaction system. The reaction system includes a double-layer dielectric barrier discharge structure to generate a uniform non-equilibrium plasma. The power supply system provides a stable electric field to generate plasma and monitors the voltage and current during the discharge process in real time to ensure that non-equilibrium plasma is continuously generated during the reaction; The product detection system collects the reaction products and performs qualitative and quantitative analysis on them to achieve accurate diagnosis and comprehensive analysis of the microscopic components in the n-heptane reforming process.

Images