Device suitable for researching water vapor reforming catalytic reaction mechanism

Abstract

The utility model relates to a device suitable for researching a water vapor reforming catalytic reaction mechanism, which comprises a raw material gas source pipeline, the raw material gas source pipeline is sequentially connected with a mass flow controller, an ultrasonic atomization humidifying unit, a heat exchanger and a two-position three-way valve along the flow direction of a gas source, one outlet of the two-position three-way valve is communicated with a high-temperature reaction unit, and the other outlet of the two-position three-way valve is communicated with a low-temperature reaction unit. And the other outlet is led to a soda lime quantitative water suction pipe and a soda lime protection water suction pipe, and waste heat of reaction outlet gas of the high-temperature reaction unit is led to a heat exchange pipe of the heat exchanger. And on the basis of the ultrasonic atomization humidifying principle, the water vapor carrying capacity of the mixed gas is adjusted in real time and is increased and decreased at any time, and the use is flexible. Gas waste heat after reaction is utilized to preheat gas before reaction through the heat exchange pipe, a resistance wire heating unit is replaced, and the device structure is simplified. A soda lime protection water suction pipe is additionally designed, and the precision of the water content of mixed gas is improved. The device is simple and feasible in structure and easy to transform and popularize.

Description

Technical Field

[0001] The utility model relates to a device suitable for studying the catalytic reaction mechanism of steam reforming. Background Art

[0002] The catalytic reaction of steam reforming involves the reaction of carbon-containing gases (such as CO, CH₄, C₂H₆, and C₃H₄) with water vapor (H₂O) under certain conditions and in the presence of a catalyst, resulting in molecular recombination to produce hydrogen (H₂). This reaction is commonly seen in fuel cells and hydrogen production mechanisms. Applicable equipment generally consists of a feed gas source, a carrier gas source, a humidification unit, a preheating unit, a high-temperature reaction unit, and gas piping. During operation, the feed gas and carrier gas are mixed, passed through the humidification unit, the preheating unit, and then into the high-temperature reaction unit for reaction. The product gas is then collected and sent to a gas chromatograph for analysis.

[0003] The technical solution in the prior art that is closest to the proposal of this application uses a water bath bubbling humidifier as a humidification unit to introduce water vapor, adjusts the water vapor load by changing the water bath temperature, and combines raw materials with carrier gas sources, resistance wire heaters, tubular furnace crucible reactors, quartz pipes and other components to achieve the above process ( Figure 1 Before and after entering the reaction unit, the humidified mixed gas will be switched to enter the soda lime water absorption pipe through a two-position three-way valve, and the water vapor load will be calculated by measuring the soda lime weight gain value.

[0004] The prior art solutions listed above suffer from a major technical drawback: the regulation of the bubbling humidification unit is subject to numerous limitations. Specifically, the following limitations exist: 1. Because the amount of water vapor produced by bubbling humidification is positively correlated with the water bath temperature, achieving the desired stable water vapor production requires waiting for the water bath to reach temperature and stabilize, which is time-consuming. 2. The humidification rate is difficult to adjust during the experiment. Increasing the bubbling gas volume simultaneously changes the reactant gas ratio or concentration. Using variable water bath temperature regulation only increases the temperature, but decreases it (which takes too long), and the gradient resolution of the adjustment is low. 3. The upper limit of the humidification rate is low, limiting it to the saturated vapor pressure of water vapor at the set temperature. Furthermore, the prior art solutions suffer from a less streamlined piping design and some incomplete details. This application proposal proposes solutions to these technical drawbacks. Utility Model Content

[0005] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a device suitable for studying the catalytic reaction mechanism of steam reforming.

[0006] In order to solve the above technical problems, the technical solution of the utility model is: a device suitable for studying the catalytic reaction mechanism of steam reforming, including a raw gas source pipeline, on which a mass flow controller, an ultrasonic atomization humidification unit, a heat exchanger, and a two-position three-way valve are connected in sequence along the gas source flow direction. One outlet of the two-position three-way valve leads to a high-temperature reaction unit, and the other outlet leads to a soda lime quantitative water absorption pipe and a soda lime protection water absorption pipe. The waste heat of the reaction outlet gas of the high-temperature reaction unit is led to the heat exchange pipe of the heat exchanger.

[0007] Preferably, the ultrasonic atomization humidification unit includes an ultrasonic humidifier, the interior of the atomization chamber of the ultrasonic humidifier is connected to a high-purity argon gas pipeline, the high-purity argon gas pipeline is connected to a mass flow controller, and the mist outlet of the atomization chamber of the ultrasonic humidifier is connected to the raw gas source pipeline.

[0008] Preferably, one end of the heat exchange tube of the heat exchanger is connected to the raw gas source pipeline, and the other end is connected to the inlet end of the two-position three-way valve.

[0009] Preferably, the high-temperature reaction unit is a reaction crucible.

[0010] Preferably, the soda lime quantitative water absorption pipe and the soda lime protection water absorption pipe are sequentially connected in series along the gas flow direction.

[0011] Preferably, the soda lime quantitative water absorption pipe and the soda lime protection water absorption pipe both include a water absorption pipeline, and the interior of the capsule connected to the water absorption pipeline is filled with soda lime.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. Based on the principle of ultrasonic atomization humidification, the water vapor load of the mixed gas can be adjusted instantly, increasing and decreasing at will, and is flexible to use.

[0014] 2. The waste heat of the post-reaction gas is used to preheat the pre-reaction gas through the heat exchange tube, replacing the resistance wire heating unit and simplifying the device structure.

[0015] 3. The design adds a soda lime protection water suction pipe to increase the accuracy of the water content of the mixed gas.

[0016] 4. The device structure is simple and easy to operate, and easy to transform and promote.

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the prior art.

[0019] Figure 2This is a schematic diagram of the structure of an embodiment of the present utility model.

[0020] In the figure: raw gas source pipeline 1, mass flow controller 2, ultrasonic atomization humidification unit 3, heat exchanger 4, two-position three-way valve 5, high-temperature reaction unit 6, soda lime quantitative water absorption pipe 7, soda lime protection water absorption pipe 8, heat exchange tube 9, atomization chamber 10, high-purity argon pipeline 11, mist outlet 12, capsule 13, water bath heater 14, bubbling humidifier 15, resistance wire heater 16, soda lime water absorption pipe 17. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0023] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0024] like Figures 1 and 2 As shown, this embodiment provides a device suitable for studying the catalytic reaction mechanism of steam reforming, including a raw gas source pipeline 1, on which a mass flow controller 2, an ultrasonic atomization humidification unit 3, a heat exchanger 4, and a two-position three-way valve 5 are connected in sequence along the gas source flow direction. One outlet of the two-position three-way valve leads to a high-temperature reaction unit 6, and the other outlet leads to a soda lime quantitative water absorption pipe 7 and a soda lime protection water absorption pipe 8. The waste heat of the reaction outlet gas of the high-temperature reaction unit is led to a heat exchange pipe 9 of the heat exchanger.

[0025] In an embodiment of the present utility model, the ultrasonic atomization humidification unit includes an ultrasonic humidifier, the atomization chamber 10 of the ultrasonic humidifier is internally connected to a high-purity argon gas pipeline 11, the high-purity argon gas pipeline is connected to a mass flow controller, and the mist outlet 12 of the atomization chamber of the ultrasonic humidifier is connected to the raw gas source pipeline.

[0026] In an embodiment of the present invention, one end of the heat exchange tube of the heat exchanger is connected to the raw gas source pipeline, and the other end is connected to the inlet end of the two-position three-way valve.

[0027] In an embodiment of the present invention, the high-temperature reaction unit is a reaction crucible.

[0028] In an embodiment of the present invention, the soda lime quantitative water absorption pipe and the soda lime protection water absorption pipe are sequentially connected in series along the gas flow direction.

[0029] In the embodiment of the present invention, both the soda-lime quantitative water absorption pipe and the soda-lime protection water absorption pipe include a water absorption pipeline, and the interior of the capsule 13 connected to the water absorption pipeline is filled with soda-lime.

[0030] In an embodiment of the present invention, the working principle of the device suitable for studying the catalytic reaction mechanism of steam reforming is as follows: during the experiment, the ultrasonic atomization and humidification unit is started and high-purity argon gas is introduced. After the uniform mist of fine water droplets is blown out and mixed with the raw gas, it is preheated by using the waste heat of the reaction outlet gas through the heat exchange tube, and then enters the high-temperature reaction crucible for reaction. Among them, the water vapor load can be adjusted instantly by changing the argon flow rate and ultrasonic intensity. The temperature range of the heat exchange tube is 150~300℃, and the temperature range of the high-temperature reaction unit is 750~1000℃. Before and after the experiment, the valve position of the two-position three-way valve is changed to allow the mixed gas to enter the soda lime quantitative water absorption pipe to absorb water for the determination of the water content of the mixed gas. The device connects a soda lime protection water absorption pipe in series after the original soda lime quantitative water absorption pipe to prevent the interference of water vapor in the environment on the determination of the water content of the mixed gas.

[0031] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation thereto. Any person skilled in the art may utilize the above disclosure to modify or remodel the present invention into equivalent embodiments. However, any simple modification, equivalent variation, or modification of the above embodiment that does not depart from the technical content of the present invention and is based on the technical essence of the present invention shall still fall within the scope of protection of the present invention.

Claims

1. A device suitable for studying the catalytic reaction mechanism of steam reforming, characterized by: The method comprises a raw gas source pipeline, on which a mass flow controller, an ultrasonic atomization humidification unit, a heat exchanger, and a two-position three-way valve are sequentially connected along the gas source flow direction. One outlet of the two-position three-way valve leads to a high-temperature reaction unit, and the other outlet leads to a soda lime quantitative water absorption pipe and a soda lime protection water absorption pipe. The waste heat of the reaction outlet gas of the high-temperature reaction unit leads to the heat exchange pipe of the heat exchanger.

2. The device for studying the catalytic reaction mechanism of steam reforming according to claim 1, characterized in that: The ultrasonic atomization humidification unit includes an ultrasonic humidifier, the interior of the atomization chamber of the ultrasonic humidifier is connected to a high-purity argon gas pipeline, the high-purity argon gas pipeline is connected to a mass flow controller, and the mist outlet of the atomization chamber of the ultrasonic humidifier is connected to a raw gas source pipeline.

3. The device for studying the catalytic reaction mechanism of steam reforming according to claim 1, characterized in that: One end of the heat exchange tube of the heat exchanger is connected to the raw gas source pipeline, and the other end is connected to the inlet end of the two-position three-way valve.

4. The device for studying the catalytic reaction mechanism of steam reforming according to claim 1, characterized in that: The high-temperature reaction unit is a reaction crucible.

5. The device for studying the catalytic reaction mechanism of steam reforming according to claim 1, characterized in that: The soda lime quantitative water absorption pipe and the soda lime protection water absorption pipe are sequentially connected in series along the gas flow direction.

6. The device for studying the catalytic reaction mechanism of steam reforming according to claim 1, characterized in that: The soda lime quantitative water absorption pipe and the soda lime protection water absorption pipe both include a water absorption pipeline, and the interior of the capsule connected to the water absorption pipeline is filled with soda lime.

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