Methanol reforming hydrogen production experimental device for simulating multi-grade heat source heat supply through electric heating

Abstract

The invention belongs to the technical field of experimental equipment, and relates to a methanol reforming hydrogen production experimental device for simulating multi-grade heat source heat supply through electric heating, which comprises a mixed steam supply assembly, a preheater, a tubular furnace, a tubular reactor, a plurality of heating assemblies, a condenser, a gas-liquid separator and a freezing dryer. According to the tubular reactor, the influence of gravity action on a catalyst can be eliminated through a vertical arrangement mode of the tubular reactor, so that the catalyst is more uniformly distributed, and a reactant is more fully contacted with the catalyst; the multiple heating assemblies provide different heating temperatures to heat different heating sections of the tubular reactor and cooperate with the preheater to adjust the inlet temperature of the tubular reactor so as to simulate multi-section heat sources with different grades, so that related research on the influence of a temperature distribution strategy on the reaction efficiency is facilitated; the water vapor in the mixed gas can be removed, and the influence of the residual water vapor on the data obtained by the experiment is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of experimental equipment and relates to a methanol reforming hydrogen production experimental device with electric heating simulating heating from multiple-grade heat sources. Background Art

[0002] In the hydrogen energy sector, methanol steam reforming has become a commonly used method for hydrogen production due to its significant advantages, including simple process, mild reaction conditions, and high hydrogen purity. This technology generates hydrogen through a chemical reaction between methanol and water vapor over a catalyst, providing an important avenue for the development and application of hydrogen energy.

[0003] Currently, laboratories often construct specialized experimental platforms for hydrogen production through methanol steam reforming. This platform primarily consists of multiple electric heating plates, a thermochemical absorber / reactor, a gas-liquid separator, and an air flow meter. The multiple electric heating plates wrap around the thermochemical absorber / reactor tubing to achieve non-uniform heating. A mixture of methanol and water is added to the thermochemical absorber / reactor, where it reacts under the action of a catalyst to produce a gaseous mixture of hydrogen, carbon dioxide, and carbon monoxide. This gaseous mixture is then separated by a gas-liquid separator.

[0004] However, the existing experimental platform for methanol steam reforming to produce hydrogen still has many defects. First, in terms of heating method, circumferential non-uniform heating makes it difficult to simulate the combination of multiple axial heat sources of different grades (such as a stepped temperature field), which greatly limits the relevant research on the impact of temperature distribution strategy on reaction efficiency; second, from the perspective of reactor structure, the horizontally arranged tubular reactor is prone to uneven distribution of catalysts due to the effect of gravity, resulting in insufficient contact between the reactants and the catalyst, affecting the reaction efficiency; finally, in terms of gas treatment, only relying on the gas-liquid separator to filter the water vapor in the mixed gas. The residual water vapor will affect the measurement accuracy of the flowmeter, resulting in large fluctuations in the experimental data and reducing the accuracy of the experimental results. Summary of the Invention

[0005] The purpose of the present invention is to provide an experimental device for methanol reforming and hydrogen production that uses electric heating to simulate multi-grade heat source heating. The device can eliminate the problem of gravitational collapse of the catalyst layer and reduce the residual water vapor in the mixed gas while simulating a multi-stage axial multi-stage heat source combination of different grades.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: An experimental device for methanol reforming and hydrogen production using electric heating simulating multi-grade heat sources includes a mixed steam supply component for supplying mixed steam of methanol and water, including: a preheater connected to the mixed steam supply assembly and used for preheating the mixed steam; The tubular furnace and the tubular reactor are both arranged vertically. The tubular reactor is arranged in the tubular furnace. The tubular reactor is filled with a catalyst. The inlet of the tubular reactor is connected to the outlet of the preheater. Multiple heating assemblies are arranged between the tubular furnace and the tubular reactor and are evenly arranged along the length of the tubular reactor. The multiple heating assemblies divide the tubular reactor into multiple heating sections from top to bottom. The multiple heating assemblies are used to provide different heating temperatures to heat the multiple heating sections of the tubular reactor, thereby cooperating with the preheater to adjust the inlet temperature of the tubular reactor to simulate multiple sections of heat sources with different grades; a condenser connected to the outlet of the tubular reactor; a gas-liquid separator connected to the outlet of the tubular reactor; The cold dryer is connected to the first outlet of the gas-liquid separator and is used to remove water vapor from the mixed gas.

[0007] The present invention is also characterized in that: Each heating element includes: The electric heating wire is arranged at the corresponding heating section on the outer side of the tubular reactor and is arranged around the tubular reactor; A plurality of thermocouples are arranged on the outer side surface and the corresponding heating sections inside the tubular reactor, and the plurality of thermocouples are respectively used to detect the temperature at the corresponding positions of the tubular reactor.

[0008] The outlet of the cold dryer is connected to a gas chromatograph, and a first gas flow meter is provided between the cold dryer and the gas chromatograph.

[0009] The mixed steam supply components include: A first liquid storage tank stores a mixture of methanol and water; a constant flow double plunger pump, the inlet of which is connected to the outlet of the first liquid storage tank; The steam generator has an inlet connected to the outlet of the constant flow double plunger pump, and the outlet of the steam generator is connected to the inlet of the preheater.

[0010] The inlet of the preheater is provided with a hydrogen tank and a nitrogen tank. Hydrogen is stored in the hydrogen tank, and nitrogen is stored in the nitrogen tank. The outlet of the hydrogen tank and the outlet of the nitrogen tank are respectively connected to the inlet of the preheater. The outlet of the hydrogen tank and the outlet of the nitrogen tank are respectively provided with a second gas flow meter.

[0011] There are five heating components, which divide the tubular reactor into five heating sections from top to bottom.

[0012] The methanol reforming hydrogen production experimental device of the present invention, which simulates heating from multiple heat sources through electric heating, has the following advantages: The present invention cooperates with a preheater, a tubular furnace, a tubular reactor, multiple heating components, a condenser, a gas-liquid separator and a cold dryer to eliminate the influence of gravity on the catalyst through the vertical arrangement of the tubular reactor, so that the catalyst distribution is more uniform, thereby making the contact between the reactants and the catalyst more sufficient. At the same time, different heating temperatures are provided by multiple heating components to heat different heating sections of the tubular reactor and the inlet temperature of the tubular reactor is adjusted in conjunction with the preheater to simulate multiple sections of heat sources of different grades, thereby facilitating relevant research on the influence of temperature distribution strategy on reaction efficiency. In addition, through the setting of the cold dryer, water vapor in the mixed gas can be removed, avoiding the influence of residual water vapor on the experimental data, and improving the accuracy of the experimental results. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0014] Figure 2 It is a schematic diagram of the top structure of the tubular reactor in the present invention.

[0015] Reference numerals: 1. Hydrogen tank, 2. Nitrogen tank, 3. Switch valve, 4. First gas flow meter, 5. First liquid storage tank, 6. Constant flow double-plunger pump, 7. Steam generator, 8. Preheater, 9. Tubular furnace, 10. Tubular reactor, 11. Processor, 12. Thermocouple, 13. Condenser, 14. Gas-liquid separator, 15. Second liquid storage tank, 16. Cold dryer, 17. Gas chromatograph, 18. Second gas flow meter. DETAILED DESCRIPTION

[0016] The technical solutions in the present invention will be described clearly and in detail below with reference to the accompanying drawings. In the description of the embodiments of the present invention, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, such as A and / or B, which can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present invention, "multiple" refers to two or more than two. The following terms "first" and "second" are used for descriptive purposes only and cannot be understood as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0017] like Figure 1As shown, the present invention provides an experimental device for methanol reforming and hydrogen production with electric heating simulating multi-grade heat source heating, comprising a mixed steam supply component, a preheater 8, a tubular furnace 9, a tubular reactor 10, multiple heating components, a condenser 13, a gas-liquid separator 14 and a cold dryer 16, the mixed steam supply component is used to supply a mixed steam of methanol and water, the preheater 8 is connected to the mixed steam supply component, the preheater 8 is used to preheat the mixed steam, the tubular furnace 9 and the tubular reactor 10 are both arranged vertically, the tubular reactor 10 is arranged in the tubular furnace 9, the tubular reactor 10 is filled with a catalyst, the inlet of the tubular reactor 10 is connected to the outlet of the preheater 8, the tubular reactor 10 is filled with a catalyst, and the catalyst is heated by the tubular reactor 16. The vertical arrangement of the reactor 10 eliminates the influence of gravity on the catalyst, making the catalyst distribution more uniform, thereby making the contact between the reactants and the catalyst more sufficient. The inlet of the tubular reactor 10 is connected to the outlet of the preheater 8 to adjust the inlet temperature of the tubular reactor 10 through the preheater 8. A plurality of heating components are arranged between the tubular furnace 9 and the tubular reactor 10. The plurality of heating components are evenly arranged along the length direction of the tubular reactor 10. The plurality of heating components divide the tubular reactor 10 from top to bottom into a plurality of heating sections. The plurality of heating components are used to provide different heating temperatures to heat the plurality of heating sections of the tubular reactor 10, thereby cooperating with the preheater 8 to adjust the inlet temperature of the tubular reactor 10 to simulate multiple sections of different The heat source of the same grade is connected. The inlet of the condenser 13 is connected to the outlet of the tubular reactor 10. The condenser 13 is used to cool the product in the tubular reactor 10 to liquefy methanol and water. The gas-liquid separator 14 is connected to the outlet of the tubular reactor 10. The gas-liquid separator 14 separates methanol, water and the mixed gas. The cold dryer 16 is connected to the first outlet of the gas-liquid separator 14. The cold dryer 16 is used to remove water vapor in the mixed gas. Since the condensation effect of the condenser 13 is limited, it can only partially remove the apparent water in the product. Therefore, the cold dryer 16 is introduced into the rear end thereof to further remove the moisture in the obtained gas. The present invention is characterized by the following steps: 3. The cooperation between the gas-liquid separator 14 and the cold dryer 16 can eliminate the influence of gravity on the catalyst through the vertical arrangement of the tubular reactor 10, so that the catalyst distribution is more uniform, thereby making the contact between the reactants and the catalyst more sufficient. At the same time, different heating temperatures are provided by multiple heating components to heat different heating sections of the tubular reactor 10 and cooperate with the preheater 8 to adjust the inlet temperature of the tubular reactor 10 to simulate multiple sections of different grades of heat sources, thereby facilitating related research on the influence of temperature distribution strategy on reaction efficiency. In addition, through the setting of the cold dryer 16, the water vapor in the mixed gas can be removed, avoiding the influence of residual water vapor on the experimental data and improving the accuracy of the experimental results.

[0018] Among them, the catalyst is preferably CuO / ZnO / Al2O 3。

[0019] like Figure 1 、 Figure 2 As shown, each heating assembly includes a heating wire and multiple thermocouples 12. The heating wire is arranged in the heating section corresponding to the outer side of the tubular reactor 10. The heating wire is arranged around the tubular reactor 10. Multiple thermocouples 12 are arranged in the outer side and the corresponding heating section inside the tubular reactor 10. The multiple thermocouples 12 are respectively used to detect the temperature of the corresponding positions of the tubular reactor 10, so that the temperature control is more accurate.

[0020] There are five heating components, which divide the tubular reactor 10 into five heating sections from top to bottom.

[0021] like Figure 1 As shown, the outlet of the cold dryer 16 is connected to a gas chromatograph 17, which is used to detect the composition and proportion of the mixed gas. A first gas flowmeter 4 is arranged between the cold dryer 16 and the gas chromatograph 17, and the first gas flowmeter 4 is used to detect the flow rate of the mixed gas. The cold dryer 16 is arranged to remove moisture from the obtained gas to prevent deviations in the measurement process of the first gas flowmeter 4 due to excessive water vapor content.

[0022] like Figure 1 As shown, the mixed steam supply assembly includes a first liquid storage tank 5, a constant flow double plunger pump 6 and a steam generator 7. The first liquid storage tank 5 stores a mixture of methanol and water. The inlet of the constant flow double plunger pump 6 is connected to the outlet of the first liquid storage tank 5, the inlet of the steam generator 7 is connected to the outlet of the constant flow double plunger pump 6, and the outlet of the steam generator 7 is connected to the inlet of the preheater 8. The steam generator 7 is used to vaporize the mixed liquid to generate steam.

[0023] like Figure 1 As shown, the inlet of the preheater 8 is provided with a hydrogen tank 1 and a nitrogen tank 2. Hydrogen is stored in the hydrogen tank 1, and nitrogen is stored in the nitrogen tank 2. The outlet of the hydrogen tank 1 and the outlet of the nitrogen tank 2 are respectively connected to the inlet of the preheater 8. The outlet of the hydrogen tank 1 and the outlet of the nitrogen tank 2 are respectively provided with a second gas flow meter 18.

[0024] like Figure 1 As shown, the second outlet of the gas-liquid separator 14 is connected to the second liquid storage tank 15 , so as to discharge the liquefied methanol and water into the second liquid storage tank 15 for storage.

[0025] like Figure 1 As shown, the outlet of the nitrogen tank 2, the outlet of the nitrogen tank 2, and the inlet of the gas chromatograph 17 are respectively provided with a switch valve 3.

[0026] like Figure 1As shown, the gas chromatograph 17 is electrically connected to a processor 17, and the processor 17 is used to process and display the composition and proportion of the mixed gas.

[0027] Working principle: Before the experiment begins, the preheater 8 is turned on and the temperature of the preheater 8 is adjusted to 150°C (with the inlet temperature of the tubular reactor 10 as the feedback signal), and the temperature of each axial heating section of the tubular reactor 10 is adjusted to the preset temperature of the experiment, that is, it is adjusted through the heating wire corresponding to each heating section, and the switch valve 3 corresponding to the hydrogen tank 1 and the nitrogen tank 2 is opened. The hydrogen and nitrogen are continuously introduced at a flow rate of 3L / min through the two second gas flow meters 18 to reduce the catalyst and exclude the air in the experimental section. After the catalyst reduction is completed, the pre-configured mixed solution of methanol and water with different water-to-alcohol ratios is pumped into the steam generator 7 through the constant flow double plunger pump 6 to generate steam, and then the steam reaches the set temperature at the inlet of the tubular reactor 10 through the preheater 8, and reacts in the tubular reactor 10. The tubular reactor 10 is arranged vertically, filled with a cylindrical catalyst inside, and the outside is passed through the tubular reactor 10 The five heating sections are heated to simulate the axial uniform / non-uniform heat flow under different grade heat source scenarios. The generated gas products and the reactants that have not participated in the reaction flow out from the outlet of the tubular reactor 10 and are sent to the condenser 13 for cooling. The condensed liquid and the non-condensable gas (i.e., the mixed gas) are then separated by the gas-liquid separator 14. Due to the limited condensation effect of the condenser, only the apparent water in the product can be partially removed. Therefore, the mixed gas is introduced into the cold dryer 16 to further remove the moisture in the obtained gas to prevent the measurement process of the first gas flowmeter 4 from deviating due to excessive water vapor content. After the flow rate of the mixed gas is detected by the first gas flowmeter 4, the mixed gas is passed through the gas chromatograph 17 to detect the composition and proportion of the mixed gas. The gas chromatograph 17 uses a certain ratio of mixed gas as a standard gas to calibrate the gas chromatograph, thereby obtaining the flow rate and composition of the generated mixed gas.

[0028] It will be understood that the present invention is described by way of some embodiments, and it will be appreciated by those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present invention are intended to be protected by the present invention.

Claims

1. An experimental device for methanol reforming and hydrogen production with electric heating simulating multi-grade heat source heating, comprising a mixed steam supply component for supplying mixed steam of methanol and water, characterized in that: include: a preheater (8), connected to the mixed steam supply assembly, for preheating the mixed steam; The tubular furnace (9) and the tubular reactor (10) are both arranged vertically. The tubular reactor (10) is arranged in the tubular furnace (9). The tubular reactor (10) is filled with a catalyst. The inlet of the tubular reactor (10) is connected to the outlet of the preheater (8). A plurality of heating components are arranged between the tubular furnace (9) and the tubular reactor (10) and are evenly arranged along the length direction of the tubular reactor (10). The plurality of heating components divide the tubular reactor (10) into a plurality of heating sections from top to bottom. The plurality of heating components are used to provide different heating temperatures to heat the plurality of heating sections of the tubular reactor (10), thereby cooperating with the preheater (8) to adjust the inlet temperature of the tubular reactor (10) to simulate a plurality of sections of heat sources with different grades. a condenser (13), connected to the outlet of the tubular reactor (10); A gas-liquid separator (14) connected to the outlet of the condenser (13); The cold dryer (16) is connected to the first outlet of the gas-liquid separator (14) and is used to remove water vapor from the mixed gas.

2. The methanol reforming hydrogen production experimental device with electric heating simulating multi-grade heat source heating according to claim 1 is characterized in that: Each of the heating assemblies comprises: The electric heating wire is arranged at a corresponding heating section on the outer side of the tubular reactor (10) and is arranged around the tubular reactor (10); A plurality of thermocouples (12) are arranged on the outer side surface and corresponding heating sections inside the tubular reactor (10), and the plurality of thermocouples (12) are respectively used to detect the temperature at corresponding positions of the tubular reactor (10).

3. The methanol reforming hydrogen production experimental device with electric heating simulating multi-grade heat source heating according to claim 1 is characterized in that: The outlet of the cold dryer (16) is connected to a gas chromatograph (17), and a first gas flow meter (4) is provided between the cold dryer (16) and the gas chromatograph (17).

4. The methanol reforming hydrogen production experimental device with electric heating simulating multi-grade heat source heating according to claim 1 is characterized in that: The mixed steam supply assembly comprises: A first liquid storage tank (5) stores a mixture of methanol and water; a constant flow double plunger pump (6), the inlet of which is connected to the outlet of the first liquid storage tank (5); The steam generator (7) has an inlet connected to the outlet of the constant flow double plunger pump (6), and the outlet of the steam generator (7) is connected to the inlet of the preheater (8).

5. The methanol reforming hydrogen production experimental device with electric heating simulating multi-grade heat source heating according to claim 4 is characterized in that: The inlet of the preheater (8) is provided with a hydrogen tank (1) and a nitrogen tank (2), the hydrogen tank (1) stores hydrogen, the nitrogen tank (2) stores nitrogen, the outlet of the hydrogen tank (1) and the outlet of the nitrogen tank (2) are respectively connected to the inlet of the preheater (8), and the outlet of the hydrogen tank (1) and the outlet of the nitrogen tank (2) are respectively provided with a second gas flow meter (18).

6. The methanol reforming hydrogen production experimental device with electric heating simulating multi-grade heat source heating according to claim 1 is characterized in that: There are five heating components, and the five heating components divide the tubular reactor (10) into five heating sections from top to bottom.

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