A small sample testing device and method for catalyst plates in a micro-reforming reactor

Abstract

The present invention relates to a micro-reforming reactor catalyst plate sample testing device and a testing method, which belongs to the field of micro-reforming reactors and solves the defects of the current catalyst plate sample testing. The device comprises an outer shell, which is composed of an upper shell and a lower shell that are detachably connected. From bottom to top, the space inside the outer shell is sequentially provided with a stacked heating plate, a lower plate, and an upper plate. The lower plate is provided with a reaction zone, and the upper plate is stacked on the reaction zone. The space between the reaction zone of the lower plate and the upper plate is used to place a catalyst plate sample. A first microchannel structure is provided on the surface of the reaction zone. The air inlet end of the first microchannel structure is connected to a gas mixing chamber provided on the lower plate, and the other end is connected to an air outlet channel. The gas mixing chamber is connected to a water vapor chamber provided on the lower plate. The gas mixing chamber is connected to the air inlet channel, and the water vapor chamber is connected to the water inlet channel. The testing device of the present invention is suitable for testing metal-based integral catalyst plate samples.

Description

Technical Field

[0001] The invention relates to the technical field of catalyst plate sample testing, and in particular to a catalyst plate sample testing device and a testing method for a micro-reforming reactor. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] In the field of fuel cells, monolithic catalysts are widely used in reformers. Monolithic catalysts can effectively reduce the pressure drop of the reaction system, reduce energy loss, and increase the mechanical strength of the catalyst. In particular, metal-based monolithic catalysts can make the temperature distribution of the entire bed uniform. However, the small sample evaluation of monolithic catalysts is generally to coat the same catalyst in cordierite and conduct evaluation tests in a fixed bed. However, cordierite catalysts have the disadvantage of uneven temperature distribution, and cordierite cannot simulate the reaction of the catalyst in the system, and cannot meet the requirements of small sample evaluation.

[0004] Patent CN114588847A introduces a microreactor with a double-layer microchannel heat dissipation chip, which includes a heat dissipation unit, a microreactor chip, an upper cover plate, a lower cover plate, a heat exchange medium inlet pipe, a heat exchange medium outlet pipe, a reaction material inlet pipe and a reaction material outlet pipe. The heat dissipation unit and the microreactor chip are alternately arranged between the layers of the upper and lower cover plates, and are fastened and fitted by welding. In the above patent application, each part is sealed by welding. For the small sample test of the catalyst plate in the fuel cell reformer, this microreactor cannot flexibly test different catalyst plates, the welding operation is complicated, the welding cost is high, and it is not suitable for the small sample test of the catalyst plate in the reformer.

[0005] Patent CN202898013U discloses a stacked micro-boss array type reforming hydrogen production microreactor, the reactor is composed of an upper cover plate, an evaporation unit, a first heating plate, 3-5 reforming reaction hydrogen production units, a second heating plate, and a lower cover plate, wherein the reforming hydrogen production unit includes a bottom plate, an intermediate auxiliary plate, a drainage plate and a reaction carrier, and the reaction carrier is loaded with a catalyst for reforming hydrogen production reaction. The catalyst in the above patent application is not a metal-based integral catalyst. If it is used for testing a small sample of a metal-based integral catalyst plate, a channel for the flow of reactants cannot be formed. Therefore, it cannot be applied to the testing of a small sample of a metal-based integral catalyst plate. Summary of the invention

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a micro-reforming reactor catalyst plate sample testing device and testing method, which is suitable for testing metal-based integral catalyst plate sample.

[0007] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0008] In the first aspect, an embodiment of the present invention provides a micro-reforming reactor catalyst plate sample testing device, comprising an outer shell, wherein the outer shell is composed of an upper shell and a lower shell that are detachably connected, and along the bottom to top direction, the inner space of the outer shell is provided with a stacked heating plate, a lower plate, and an upper plate in sequence, the lower plate is provided with a reaction zone, the upper plate is stacked on the reaction zone, and the space between the reaction zone of the lower plate and the upper plate is used to place a catalyst plate sample, and a first microchannel structure is provided on the surface of the reaction zone, the air inlet end of the first microchannel structure is connected to a gas mixing chamber provided on the lower plate, the air outlet end is connected to an air outlet channel, the gas mixing chamber is connected to a water vapor chamber provided on the lower plate, the gas mixing chamber is connected to the air inlet channel, and the water vapor chamber is connected to the water inlet channel.

[0009] Optionally, a groove is provided on the top surface of the lower shell, and the upper shell adopts a flat plate structure, the groove forms a space inside the shell, and a heating plate, a lower plate and an upper plate are sequentially stacked in the groove from bottom to top;

[0010] The depth of the groove is equal to the sum of the thicknesses of the heating plate, the lower plate and the upper plate after being stacked, and a pad is provided between the top surface of the lower shell, the top surface of the upper plate and the upper shell.

[0011] Optionally, at least one temperature detection element is provided between the upper shell and the pad.

[0012] Optionally, the lower plate includes a first plate portion and a second plate portion, the thickness of the first plate portion is greater than the thickness of the second plate portion, the second plate portion matches the upper plate portion and is used to cooperate with the upper plate portion, the upper surface of the second plate portion is a reaction zone, and the first plate portion is provided with a gas mixing chamber and a water vapor chamber connected through a connecting channel;

[0013] The difference in thickness between the first plate portion and the second plate portion is equal to the thickness of the upper plate so that after the upper plate and the lower plate are matched, the upper surface of the upper plate is flush with the upper surface of the first plate portion.

[0014] Optionally, the first plate portion is provided with a first water inlet communicated with the water vapor chamber, the outer shell is provided with a second water inlet communicated with the first water inlet, and the first water inlet and the second water inlet constitute a water inlet channel.

[0015] Optionally, the first plate portion is provided with a first air inlet communicated with the gas mixing chamber, the shell is provided with a second air inlet communicated with the first air inlet, and the first air inlet and the second air inlet constitute an air inlet channel.

[0016] Optionally, the air outlet channel is arranged on the outer shell.

[0017] Optionally, the first microchannel structure of the reaction zone of the lower plate includes a first Z-shaped reaction zone microchannel structure that allows the airflow to flow in a Z shape, wherein the air inlet end of the first Z-shaped reaction zone microchannel structure is connected to the gas mixing chamber through an air inlet microchannel, and the air outlet end is connected to the air outlet channel through an air outlet microchannel.

[0018] Optionally, the upper plate also has a reaction zone, and the reaction zone is provided with a second microchannel structure matching the first microchannel structure;

[0019] The reaction zones of the upper plate and the lower plate are provided with placement grooves, the placement groove of the lower plate is provided with a first Z-shaped reaction zone microchannel structure, the placement groove of the upper plate is provided with a second Z-shaped reaction zone microchannel structure matching the first Z-shaped reaction zone microchannel structure, and after the upper plate and the lower plate are bonded together, a space for accommodating a small sample of the catalyst plate is formed through the placement grooves.

[0020] Optionally, a third microchannel structure is provided in the water vapor chamber and / or the gas mixing chamber.

[0021] Optionally, the upper shell and the lower shell are detachably fixedly connected via a plurality of threaded fasteners.

[0022] In a second aspect, an embodiment of the present invention provides a method for testing a small sample test device for a micro-reforming reactor catalyst plate according to the first aspect, comprising the following steps:

[0023] Place the catalyst plate sample to be tested in the reaction zone of the lower plate, assemble the lower plate and the upper plate so that the catalyst plate sample is located between the reaction zones of the upper plate and the lower plate, and fix the upper shell on the lower shell;

[0024] The heating plate is started, gas is introduced through the air inlet channel, water is introduced through the water inlet channel, water vapor formed after the introduced water evaporates in the water vapor chamber enters the gas mixing chamber, and is mixed with the introduced gas in the gas mixing chamber, and the gas and water vapor are mixed and enter the first microchannel structure and flow, and a reforming reaction occurs under the catalytic action of the catalyst plate sample;

[0025] The gas discharged from the exhaust channel is sampled and the exhaust gas composition is analyzed, and the performance of the catalyst plate sample is judged based on the exhaust gas composition analysis results.

[0026] The beneficial effects of the present invention are as follows:

[0027] 1. The test device of the present invention is provided with a heating plate, the reaction zone of the lower plate is provided with a first microchannel structure, the lower plate is provided with a gas mixing chamber and a water vapor chamber, under the action of the heating plate, the water introduced into the water vapor chamber can evaporate, the formed water vapor enters the gas mixing chamber, and mixes with the gas introduced into the gas mixing chamber, the catalyst plate sample can be placed between the upper plate and the lower plate and located in the reaction zone, the gas flowing out of the gas mixing chamber can flow through the first microchannel structure, so that a reforming reaction occurs under the catalytic action of the catalyst sample, and the reacted gas is discharged through the gas outlet channel, the heating of the heating plate makes the temperature distribution of the reaction zone uniform, and can simulate the entire fuel cell reforming reaction process, meeting the requirements of sample evaluation, and at the same time, because the upper shell and the lower shell are detachably connected, it is convenient to replace the catalyst sample, and different catalyst plate samples can be flexibly tested, which improves the applicability of the entire test device and reduces the test cost.

[0028] 2. The test device of the present invention has a water vapor chamber and a mixed gas chamber on the lower plate, and utilizes a heating plate to heat and evaporate water to generate water vapor, thereby eliminating an external water vapor evaporator component, realizing the integration of a water evaporator and a micro-reforming reactor, and reducing the test cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0030] Figure 1 This is an exploded schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0031] Figure 2 is a schematic diagram of the structure of the lower shell of Embodiment 1 of the present invention;

[0032] Figure 3 This is an exploded schematic diagram of the assembly of the upper shell and the pad in Example 1 of the present invention;

[0033] Figure 4 This is a schematic diagram of the lower plate structure of Example 1 of the present invention;

[0034] Figure 5 is a top view of the lower plate of Example 1 of the present invention;

[0035] Figure 6 This is an exploded schematic diagram of the assembly of a small sample of a lower plate, an upper plate and a catalyst plate in Example 1 of the present invention;

[0036] Among them, 1. lower shell, 2. upper shell, 3. heating plate, 4. lower plate, 5. upper plate, 6. catalyst plate sample, 7. pad, 8. gas mixing chamber, 9. gas outlet channel, 10. water vapor chamber, 11. thermocouple installation slot, 12. threading hole, 13. first Z-type reaction zone microchannel structure, 14. first air inlet microchannel, 15. first air outlet microchannel, 16. second air inlet microchannel, 17. second air outlet microchannel, 18. second Z-type reaction zone microchannel structure; 19. fixing hole, 20. threaded hole;

[0037] 1-1. Second air inlet, 1-2. Second water inlet;

[0038] 4-1. First plate portion, 4-1-1. First air inlet, 4-1-2. First water inlet, 4-1-3. Connecting channel, 4-2. Second plate portion;

[0039] 13-1. Longitudinal microchannel, 13-2. Transverse microchannel on the air inlet side, 13-3. Transverse microchannel on the air outlet side. DETAILED DESCRIPTION

[0040] Example 1

[0041] This embodiment provides a small sample testing device for catalyst plates in a micro-reforming reactor, such as Figure 1 As shown, it includes a shell, a cavity is provided in the shell, the shell is composed of a lower shell 1 and an upper shell 2 that are detachably connected, and along the direction from bottom to top, a heating plate 3, a lower plate 4, and an upper plate 5 are stacked in sequence in the cavity, and a small sample 6 of the catalyst plate to be tested is used to be placed between the lower plate 4 and the upper plate 5. A pad 7 is provided between the top surface of the lower shell 1, the upper surface of the upper plate 5 and the upper shell 2, the upper surface of the lower plate 4 has a reaction zone, and a first microchannel structure is provided at the reaction zone. The first microchannel structure is used for the flow of airflow, and the air inlet end of the first microchannel structure is connected to the gas mixing chamber 8 provided on the lower plate 4, and the air outlet end is connected to the air outlet channel 9. The lower plate 4 is also provided with a water vapor chamber 10, and the water vapor The cavity 10 and the gas mixing cavity 8 are interconnected through the connecting channel 4-1-3 opened in the lower plate 4. The water vapor cavity 10 is connected with the water inlet channel. The water inlet channel is used to introduce water into the water vapor cavity 10, and evaporate it by the heating effect of the heating plate 3 to form water vapor. The water vapor can enter the gas mixing cavity 8 through the connecting channel 4-1-3. The gas mixing cavity 8 is connected with the air inlet channel. The air inlet channel is used to introduce gas into the gas mixing cavity 8. In this embodiment, the introduced gas is methane. The mixed gas of methane and water vapor can enter the first microchannel structure and flow. During the flow, a reforming reaction occurs under the catalytic action of the catalyst plate sample 6, and the gas after the reaction is discharged through the air outlet channel 9.

[0042] In this embodiment, Figure 2-Figure 3As shown, the shell is composed of an upper shell 2 and a lower shell 1 that are detachably connected. Specifically, the upper shell 2 adopts a plate-like structure, and a groove is provided on the upper surface of the lower shell 1. The groove forms an internal cavity of the shell, and the depth of the groove is the same as the thickness of the overall structure formed by the heating plate 3, the lower plate 4, and the upper plate 5. After the heating plate 3, the lower plate 4 and the upper plate 5 are placed in the groove, the top surface of the upper plate 5 is flush with the top surface of the lower shell 1.

[0043] A pad 7 is provided between the top surfaces of the upper shell 2 and the lower shell 1 and the upper surface of the upper plate 5. The shape of the pad 7 matches the horizontal cross-sectional shape of the upper shell 2 and the lower shell 1. The pad 7 is made of vermiculite, mica, graphite, etc., preferably a vermiculite pad. Its main function is to prevent gas leakage.

[0044] The upper shell 2 and the lower shell 1 are detachably fixedly connected by threaded fasteners. A plurality of threaded holes 20 are provided along the edge of the lower shell 1. A plurality of fixing holes 19 matching the threaded holes 20 are provided along the edge of the upper shell 2 and the pad 7. The threaded fasteners are fastening bolts. The fastening bolts pass through the fixing holes 19 and are threadedly fixedly connected to the lower shell 1 through the threaded holes 20, thereby fixing the upper shell 2 and the lower shell 1. By loosening the fastening bolts, the upper shell 2 and the lower shell 1 can be separated.

[0045] Furthermore, at least one temperature detection element is provided between the upper shell 2 and the pad 7 for detecting the temperature.

[0046] In this embodiment, three temperature detection elements are provided, and the temperature detection elements are thermocouples.

[0047] The mating surfaces of the upper shell 2 and the pad 7 are both provided with three thermocouple mounting grooves 11. After the upper shell 2 and the pad 7 are mated, the thermocouple is inserted into the space formed by the corresponding thermocouple mounting grooves 11 to achieve the fixation of the thermocouple.

[0048] The heating plate 3 adopts an existing electric heating plate, which covers the bottom groove surface of the groove. Correspondingly, a threading hole 12 is provided on the lower shell 1, and the power line of the electric heating plate extends to the outside of the lower shell 1 through the threading hole 12.

[0049] like Figure 4-Figure 6As shown, the lower plate 4 adopts a plate-like structure that matches the horizontal cross-section of the groove. The lower plate 4 includes a first plate portion 4-1 and a second plate portion 4-2 located on one side of the first plate portion 4-1. The lower surfaces of the first plate portion 4-1 and the second plate portion 4-2 are flush, the thickness of the first plate portion 4-1 is greater than the thickness of the second plate portion 4-2, and the upper plate 5 is placed on the second plate portion 4-2. The difference in thickness between the first plate portion 4-1 and the second plate portion 4-2 is equal to the thickness of the upper plate 5 so that after the upper plate 5 is placed on the second plate portion 4-2, the upper surface of the upper plate 5 is flush with the upper surface of the first plate portion 4-1, and the upper surface of the upper plate 5, the upper surface of the first plate portion 4-1, and the upper surface of the lower shell 1 are all sealed and fitted with the lower surface of the gasket 7.

[0050] The upper surface of the second plate portion 4-2 serves as a reaction zone, in which a catalyst plate sample 6 is placed for the reforming reaction of methane and water vapor.

[0051] Preferably, the lower surface of the upper plate 5 also serves as a reaction zone, and the reaction zone cooperates with the catalyst plate sample 6 for the reforming reaction of methane and water vapor.

[0052] With this arrangement, both sides of the catalyst plate sample 6 are used for catalytic reforming reactions.

[0053] The reaction zones of the upper plate 5 and the lower plate 4 are both provided with placement grooves, and the bottom groove surface of the placement groove of the lower plate 4 is provided with a plurality of parallel partitions, the length of the partitions being smaller than the length of the placement grooves, so that both ends of the partitions have a set distance from the side groove surface of the placement grooves, forming a first Z-shaped reaction zone microchannel structure 13 that allows the airflow to flow along a Z-shaped trajectory.

[0054] Specifically, the first Z-type reaction zone microchannel structure 13 includes a longitudinal microchannel 13-1 between adjacent partitions, the air inlet end of the longitudinal microchannel 13-1 is vertically connected to the air inlet side transverse microchannel 13-2, and the air outlet side is vertically connected to the air outlet side transverse microchannel 13-3, wherein the air inlet side transverse microchannel 13-2 is formed by the air inlet side end of the partition and the air inlet side side groove surface of the placement groove, and the air outlet side transverse microchannel 13-3 is formed by the air outlet side end of the partition and the air outlet side side groove surface of the placement groove.

[0055] The upper surface of the second plate portion 4-2 is provided with a first air inlet microchannel 14 vertically connected to one end of the air inlet side transverse microchannel 13-2 and a first air outlet microchannel 15 vertically connected to one end of the air outlet side transverse microchannel 13-3.

[0056] The connection position between the inlet-side transverse microchannel 13 - 2 and the first inlet microchannel 14 and the connection position between the outlet-side transverse microchannel 13 - 3 and the first outlet microchannel 15 are located on different sides so that the airflow can flow along a Z-shaped trajectory.

[0057] The first Z-shaped reaction zone microchannel structure 13, the first gas inlet microchannel 14 and the first gas outlet microchannel 15 together constitute a first microchannel structure.

[0058] Correspondingly, the lower surface of the upper plate 5 is used as a reaction zone, and is also provided with a placement groove, and a partition bar is provided in the placement groove. The lower surface of the upper plate 5 is also provided with a second air inlet microchannel 16 matching the first air inlet microchannel 14 and a second air outlet microchannel 17 matching the first air outlet microchannel 15. A second Z-type reaction zone microchannel structure 18 matching the first Z-type reaction zone microchannel structure 13 is provided between the second air inlet microchannel 16 and the second air outlet microchannel 17. The second Z-type reaction zone microchannel structure 18 also includes a longitudinal microchannel, an air inlet side transverse microchannel, and an air outlet side transverse microchannel. The second air inlet microchannel 16, the second air outlet microchannel 17, and the second Z-type reaction zone microchannel structure 18 form a second microchannel structure matching the first microchannel structure on the lower surface of the upper plate 5.

[0059] In this embodiment, the thickness of the partition strip is smaller than the depth of the placement groove. After the upper plate 5 is bonded to the second plate portion 4-2, the distance between the relative surfaces of the partition strips on both sides is equal to the thickness of the catalyst plate sample 6, so that a space for placing the catalyst plate sample 6 is formed between the partition strips on both sides. When in use, the catalyst plate sample 6 is clamped by the partition strips on both sides.

[0060] After the upper plate 5, the lower plate 4 and the catalyst plate sample 6 are matched, the two sides of the catalyst plate sample 6 are partitions to form longitudinal microchannels, the first air inlet microchannel 14 and the second air inlet microchannel 16 form an integral air inlet microchannel, and the first air outlet microchannel 15 and the second air outlet microchannel 17 form an integral air outlet microchannel.

[0061] The air outlet microchannel formed by the first air outlet microchannel 15 and the second air outlet microchannel 17 is communicated with the air outlet channel 9 opened on the lower shell 1 .

[0062] The transverse microchannels on the air inlet side of the upper plate 5 and the lower plate 4 are combined to form an air inlet microchannel that is connected to the air inlet ends of the longitudinal microchannels on both sides of the catalyst plate sample 6. The transverse microchannels on the air outlet side of the upper plate 5 and the lower plate 4 are combined to form an air outlet microchannel that is connected to the air outlet ends of the longitudinal microchannels on both sides of the catalyst plate sample 6.

[0063] A gas mixing chamber 8 is provided on the upper surface of the first plate portion 4-1, and the gas mixing chamber 8 is connected to one end of the connecting channel, and the other end of the connecting channel is connected to the first air intake microchannel 14 and the second air intake microchannel 16 to form an integral air intake microchannel. The gas mixing chamber 8 is also connected to the air intake channel, and the air intake channel includes a first air inlet port 4-1-1 provided on the first plate portion 4-1 and a second air inlet port 1-1 provided on the lower shell 1. The first air inlet port 4-1-1 and the second air inlet port 1-1 are connected to form an air intake channel.

[0064] A water vapor chamber 10 is also provided on the upper surface of the first plate portion 4 - 1 , and the water vapor chamber 10 is connected to the gas mixing chamber 8 through a connecting channel 4 - 1 - 3 opened inside the first plate portion 4 - 1 .

[0065] The water vapor chamber 10 is connected to the water inlet channel. Specifically, the water inlet channel includes a first water inlet 4-1-2 opened in the first plate portion 4-1 and a second water inlet 1-2 opened in the lower shell 1. The first water inlet 4-1-2 and the second water inlet 1-2 are connected to form a water inlet channel.

[0066] The water vapor chamber 10 and the gas mixing chamber 8 are both provided with a third microchannel structure to ensure the uniformity of mixing of water vapor and methane gas, wherein the water inlet channel is connected to the inlet end of the third microchannel structure of the water vapor chamber 10, the connecting channel 4-1-3 is connected to the outlet end of the third microchannel structure in the water vapor chamber 10, the air inlet channel is connected to the inlet end of the third microchannel structure in the gas mixing chamber 8, and the first air inlet microchannel 14 and the second air inlet microchannel 16 are connected to the outlet end of the third microchannel structure.

[0067] Specifically, multiple partitions are provided on two opposite cavity surfaces of the water vapor cavity 10 and the gas mixing cavity 8 along the gas flow direction. The length of the partition is smaller than the width of the water vapor cavity 10 and the gas mixing cavity 8. The partitions on the two cavity surfaces are staggered to form a third microchannel structure.

[0068] In this embodiment, the housing, the upper plate 5 and the lower plate 4 are all made of stainless steel, such as 304 stainless steel, 316 stainless steel, 316L stainless steel or 310s stainless steel, etc., and 316L stainless steel is preferably used.

[0069] Example 2

[0070] This embodiment provides a testing method for the catalyst plate sample testing device for a micro-reforming reactor described in Embodiment 1, comprising the following steps:

[0071] Step 1: Place the catalyst plate sample 6 to be tested in the reaction zone of the lower plate 4, support it with spacers, and then place the upper plate 5 on the lower plate 4. The spacers between the upper plate 5 and the lower plate 4 clamp the catalyst plate sample 6. The catalyst plate sample 6 is located between the reaction zones of the upper plate 5 and the lower plate 4.

[0072] Among them, the catalyst plate sample 6 is a metal-based integral catalyst plate sample, which can be a flat plate structure or a rectangular fin structure, a corrugated fin structure or a CW-type fin structure. The size of the catalyst plate sample in this embodiment is 100mm*100mm.

[0073] Step 2: Place the gasket 7 and the upper shell 2 in sequence, and then fix the upper shell 2 and the lower shell 1 with bolts. The upper shell 2 presses the gasket 7 against the upper surface of the lower shell 1, the first plate portion 4-1 and the upper plate 5 to achieve sealing. The whole process does not require welding operation, and the operation process is simple and convenient.

[0074] Step 3: Start the electric heating plate, pre-set the heating temperature of the electric heating plate to 500°C, and after the temperature stabilizes, introduce water into the water inlet channel and methane gas into the air inlet channel. The molar ratio of water to methane is 0.5-3.5, the pressure is 0.1bar-1bar, and the volume space velocity is 7000h -1 -20000h -1 (Volume space velocity: Raw material volume flow rate (20℃, m 3 ·h -1 ) / catalyst volume (m 3 ), that is, the amount of gas treated by unit volume of catalyst per unit time), under the action of the electric heating plate, the water introduced into the water vapor chamber 10 is heated and evaporated, and the generated water vapor enters the gas mixing chamber 8 through the connecting channel 4-1-3, and is mixed with the introduced methane gas. The mixed gas of water vapor and methane flows into the first microchannel structure and the second microchannel structure, and a reforming reaction occurs under the catalytic action of the catalyst plate sample 6. After the reaction is stably carried out for 5h, 10h, 100h, and 500h, respectively, a gas chromatograph is used to take samples online at the outlet channel 9 and analyze the exhaust gas composition.

[0075] Methane conversion rate X = (input methane amount - output methane amount) / input methane amount × 100%.

[0076] The test device and test method of this embodiment are that the upper shell 2, the pad 7, and the upper plate 5 are all detachable, so the test device can flexibly test different catalyst plate samples 6, detect different catalyst performances, such as reforming conversion rate, carbon deposition, catalyst life, etc., and screen out the most suitable catalyst formula. During the test, the process of fuel cell reforming reaction can be simulated, and the test results can be reflected in the reaction of the fuel cell system reformer, which has a high reference value for the performance of the reformer. The performance evaluated by the test device serves as a reference for the catalyst in the fuel cell reformer. Moreover, the lower plate 4 is provided with a water vapor chamber 10 and a gas mixing chamber 8, and the heating plate 3 is used to heat and evaporate water to generate water vapor, eliminating the external water vapor evaporator component, and realizing the integration of the water evaporator and the micro-reforming reactor. The entire test device has a high degree of integration, reduces the test cost, and reduces the occupied space of the test device.

[0077] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A micro-reforming reactor catalyst plate sample testing device, characterized in that: The invention comprises an outer shell, wherein the outer shell is composed of an upper shell and a lower shell which are detachably connected. From bottom to top, the inner space of the outer shell is provided with a heating plate, a lower plate, and an upper plate which are stacked in sequence. The lower plate is provided with a reaction zone, and the upper plate is stacked on the reaction zone. A catalyst plate sample is placed between the reaction zone of the lower plate and the upper plate. A first microchannel structure is provided on the surface of the reaction zone. The air inlet end of the first microchannel structure is connected to a gas mixing chamber provided on the lower plate, and the air outlet end is connected to an air outlet channel. The gas mixing chamber is connected to a water vapor chamber provided on the lower plate, and the gas mixing chamber is connected to an air inlet channel, and the water vapor chamber is connected to a water inlet channel. The top surface of the lower shell is provided with a groove, and the upper shell adopts a flat plate structure. The groove forms a space inside the shell, and a heating plate, a lower plate and an upper plate are sequentially stacked in the groove from bottom to top; The depth of the groove is equal to the sum of the thicknesses of the heating plate, the lower plate and the upper plate after being stacked, and a pad is provided between the top surface of the lower shell, the top surface of the upper plate and the upper shell; The lower surface of the upper plate is also used as a reaction zone, the reaction zone is matched with the catalyst plate sample, both sides of the catalyst plate sample are used for catalytic reforming reaction, and the reaction zone is provided with a second microchannel structure matching the first microchannel structure; The reaction zones of the upper plate and the lower plate are provided with placement grooves, the placement groove of the lower plate is provided with a first Z-shaped reaction zone microchannel structure, the placement groove of the upper plate is provided with a second Z-shaped reaction zone microchannel structure matching the first Z-shaped reaction zone microchannel structure, and after the upper plate and the lower plate are bonded, a space for accommodating a small sample of the catalyst plate is formed through the placement grooves; The lower plate comprises a first plate portion and a second plate portion, the thickness of the first plate portion is greater than the thickness of the second plate portion, the second plate portion matches the upper plate portion and is used to cooperate with the upper plate portion, the upper surface of the second plate portion is a reaction zone, and the first plate portion is provided with a gas mixing chamber and a water vapor chamber connected by a connecting channel; The difference in thickness between the first plate portion and the second plate portion is equal to the thickness of the upper plate so that after the upper plate and the lower plate are matched, the upper surface of the upper plate is flush with the upper surface of the first plate portion.

2. A micro-reforming reactor catalyst plate sample testing device as claimed in claim 1, characterized in that: At least one temperature detection element is arranged between the upper shell and the backing plate.

3. A micro-reforming reactor catalyst plate sample testing device as claimed in claim 1, characterized in that: The first plate portion is provided with a first water inlet communicated with the water vapor chamber, the shell is provided with a second water inlet communicated with the first water inlet, and the first water inlet and the second water inlet constitute a water inlet channel.

4. A micro-reforming reactor catalyst plate sample testing device as claimed in claim 1, characterized in that: The first plate portion is provided with a first air inlet communicated with the gas mixing chamber, the shell is provided with a second air inlet communicated with the first air inlet, and the first air inlet and the second air inlet constitute an air inlet channel.

5. A micro-reforming reactor catalyst plate sample testing device as claimed in claim 1, characterized in that: The air outlet channel is arranged on the shell.

6. A micro-reforming reactor catalyst plate sample testing device as claimed in claim 1, characterized in that: The first microchannel structure of the reaction zone of the lower plate includes a first Z-shaped reaction zone microchannel structure that allows the airflow to flow in a Z shape, wherein the air inlet end of the first Z-shaped reaction zone microchannel structure is connected to the gas mixing chamber through an air inlet microchannel, and the air outlet end is connected to the air outlet channel through an air outlet microchannel.

7. A micro-reforming reactor catalyst plate sample testing device as claimed in claim 1, characterized in that: A third microchannel structure is provided in the water vapor chamber and / or the gas mixing chamber.

8. A micro-reforming reactor catalyst plate sample testing device as claimed in claim 1, characterized in that: The upper shell and the lower shell are detachably fixedly connected via a plurality of threaded fasteners.

9. A testing method for a small sample testing device for a micro-reforming reactor catalyst plate according to any one of claims 1 to 8, characterized in that: The following steps are involved: Place the catalyst plate sample to be tested in the reaction zone of the lower plate, assemble the lower plate and the upper plate so that the catalyst plate sample is located between the reaction zones of the upper plate and the lower plate, and fix the upper shell on the lower shell; The heating plate is started, gas is introduced through the air inlet channel, water is introduced through the water inlet channel, water vapor formed after the introduced water evaporates in the water vapor chamber enters the gas mixing chamber, and is mixed with the introduced gas in the gas mixing chamber, and the gas and water vapor are mixed and enter the first microchannel structure and flow, and a reforming reaction occurs under the catalytic action of the catalyst plate sample; The gas discharged from the exhaust channel is sampled and the exhaust gas composition is analyzed, and the performance of the catalyst plate sample is judged based on the exhaust gas composition analysis results.

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