Catalytic combustion testing device for SOFC (Solid Oxide Fuel Cell)

Abstract

The utility model provides a catalytic combustion testing device for a solid oxide fuel cell (SOFC), and belongs to the field of solid oxide fuel cells. Comprising a fan, a heat exchanger, a mixing pipeline, a combustor, a heating device and an observation device. Wherein the outlet end of the fan is connected with a cold stream inlet of the heat exchanger, a cold stream outlet of the heat exchanger is connected with one end of the combustor through the mixing pipeline, the mixing pipeline is provided with a gas connecting pipe, a catalyst carrier is arranged in the combustor, and the other end of the combustor is connected with a hot stream inlet of the heat exchanger. A carrier temperature sensor connected with the catalyst carrier is arranged on the combustor, the heating device is connected with the combustor, pressure sensors and temperature sensors are arranged at the two ends of the combustor, and the observation device is connected with an inner cavity of the combustor. The actual working conditions of combustors in SOFC systems of different specifications can be simply and quickly simulated, and the performance verification test of the catalyst is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to solid oxide fuel cell field especially relates to a SOFC is with catalytic combustion testing arrangement. BACKGROUND

[0002] Solid oxide fuel cell (Solid Oxide Fuel Cell, SOFC for short) is a kind of device for converting chemical energy in fuel into electric energy directly, it has strong fuel adaptability, high energy density, pollution-free, low noise and other advantages.Its working principle is that air is input by air blower, enters fuel cell cathode after heat exchange by SOFC catalytic combustion testing arrangement, hydrogen is reformed into after fuel or other alkane gas in gas cylinder enters anode, carries out electrochemical reaction in the inside of electric pile and generates electricity, and the remaining unreacted fuel enters combustion chamber and burns, and the waste heat generated preheats system air.

[0003] In related technologies, SOFC combustion chamber uses open fire to burn anode tail gas, but such ignition temperature is higher, and complete oxidation is not thorough enough.Therefore, catalyst needs to be introduced to reduce the ignition temperature of fuel gas and improve combustion efficiency.However, in order to verify the performance of catalyst, the process of directly testing by SOFC system is complex, and the power consumption is high, and the fuel gas type used by SOFC system under different working conditions, air flow and other parameters of fuel gas and air are different, resulting in high limitation of test results and limited reference value. INVENTION CONTENTS

[0004] The utility model embodiment provides a kind of SOFC catalytic combustion testing arrangement, the actual working condition of burner in SOFC system under different working conditions can be simulated simply and quickly, and the performance verification test of catalyst is realized.The technical scheme is as follows:

[0005] The utility model embodiment provides a kind of SOFC catalytic combustion testing arrangement, including: fan, heat exchanger, mixed pipe, burner, heating device and observation device,

[0006] The inlet end of the fan is used to communicate with external air, the outlet end of the fan is connected with the cold stream inlet of the heat exchanger, the cold stream outlet of the heat exchanger is connected with one end of the burner through the mixed pipe, a gas connection pipe for connecting a fuel gas supply end is arranged on the mixed pipe, a catalyst carrier is arranged in the burner, the other end of the burner is connected with the hot stream inlet of the heat exchanger, a carrier temperature sensor connected with the catalyst carrier is arranged on the burner, the heating device is connected with the burner, pressure sensors and temperature sensors are arranged on both ends of the burner, and the observation device is connected with the inner cavity of the burner.

[0007] Optionally, the catalyst carrier is detachably connected with the inner cavity of the combustor.

[0008] Optionally, the hot stream outlet of the heat exchanger is provided with a tail gas proportioning valve.

[0009] Optionally, further comprising a tail gas collecting bag and a bypass proportioning valve, the inlet of the bypass proportioning valve is connected with a pipeline between the other end of the combustor and the hot stream inlet of the heat exchanger, and the outlet of the bypass proportioning valve is connected with the tail gas collecting bag.

[0010] Optionally, the outlet of the bypass proportioning valve and the tail gas collecting bag are connected through a hose.

[0011] Optionally, an ejector is arranged at the connection between the gas connecting pipeline and the mixing pipeline.

[0012] Optionally, an outlet temperature sensor is arranged between the cold stream outlet of the heat exchanger and the ejector.

[0013] Optionally, the heating device comprises an adjustable power supply and a first electric heating wire, the adjustable power supply is electrically connected with the first electric heating wire, and the first electric heating wire is wound on the outer sidewall of the combustor.

[0014] Optionally, further comprising a second electric heating wire, the second electric heating wire is wound on the heat exchanger and electrically connected with the adjustable power supply.

[0015] Optionally, the heat exchanger is a shell-and-tube heat exchanger.

[0016] The technical scheme provided by the embodiment of the utility model has at least the following beneficial effects:

[0017] The SOFC catalytic combustion test device provided by the embodiment of the utility model is used for simplifying and simulating part of the structure of the SOFC system, separately selecting parts related to the structure of the combustor, independently connecting the parts through pipelines, and arranging corresponding sensors and other detection devices at relevant positions to form the SOFC catalytic combustion test device. The actual operating conditions of the combustor in the SOFC system are simulated, and the performance of the catalyst in the combustor is verified. The device is simple to assemble and set up. According to different test requirements, the catalyst to be tested can be arranged in the combustor through the catalyst carrier, and external air and fuel gas can be introduced for combustion test. At the same time, the high-temperature tail gas at the rear end of the combustor can be introduced into the hot stream side of the heat exchanger, and the air introduced from the cold stream side by the fan can be controlled in temperature. The actual operating conditions of the combustor in the SOFC system under different conditions can be simulated simply and quickly, and the performance verification test of the catalyst can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the premise of not paying creative effort.

[0019] Figure 1 is a structural schematic diagram of the catalytic combustion testing device for SOFC provided by the embodiments of the present application;

[0020] Figure 2 is a three-dimensional structural schematic diagram of the catalytic combustion testing device for SOFC provided by the embodiments of the present application;

[0021] Figure 3 is Figure 2 a local structure enlarged view of the burner position in the device.

[0022] In the figure, 1 is a fan, 2 is a heat exchanger, 3 is a mixing pipeline, 4 is a burner, 5 is a heating device, 6 is an observation device, 7 is a tail gas proportional valve, 8 is a tail gas collection bag, 9 is a bypass proportional valve, 21 is an outlet temperature sensor, 31 is a gas connecting pipe, 32 is an ejector, 41 is a catalyst carrier, 42 is a carrier temperature sensor, 43 is a connecting port, 51 is an adjustable power supply, 52 is a first electric heating wire, 53 is a second electric heating wire, m is a pressure sensor, n is a temperature sensor, and o is a gas supply end. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0024] Figure 1 is a structural schematic diagram of the catalytic combustion testing device for SOFC provided by the embodiments of the present application; Figure 2 is a three-dimensional structural schematic diagram of the catalytic combustion testing device for SOFC provided by the embodiments of the present application; Figure 3 is Figure 2 a local structure enlarged view of the burner position in the device. Figures 1 to 3 As shown in the figure, the embodiments of the present application first provide a catalytic combustion testing device for SOFC, which comprises a fan 1, a heat exchanger 2, a mixing pipeline 3, a burner 4, a heating device 5 and an observation device 6.

[0025] The inlet end of the fan 1 is used to communicate with external air, and the outlet end of the fan 1 is connected with the cold flow inlet of the heat exchanger 2. The cold flow outlet of the heat exchanger 2 is connected with one end of the burner 4 through the mixing pipe 3, and the mixing pipe 3 is provided with a gas connecting pipe 31 used for connecting a gas supply end o. The catalyst carrier 41 is arranged in the burner 4, and the other end of the burner 4 is connected with the hot flow inlet of the heat exchanger 2. The burner 4 is provided with a carrier temperature sensor 42 connected with the catalyst carrier 41. The heating device 5 is connected with the burner 4, and the burner 4 is provided with a pressure sensor m and a temperature sensor n at both ends. The observation device 6 is connected with the inner cavity of the burner 4.

[0026] In the embodiment of the utility model, as the important index of verifying the performance of catalytic combustion catalyst, its influence effect on the ignition temperature of gas is very important. When the testing device is used, the staff can first coat the catalyst to be detected on the catalyst carrier 41, wherein one end of the burner 4 is provided with a connecting port 43 connected with the external pipe, and the catalyst carrier 41 is detachably connected with the inner cavity of the burner 4. After selecting the catalyst to be detected and completing the coating on the catalyst carrier 41, the catalyst carrier 41 can be loaded into the inner cavity of the burner 4 from the connecting port 43, and sealed connection is carried out through the flange and other connecting structures. Then, the connection and installation of other parts are sequentially completed, so that the SOFC catalytic combustion testing device is assembled and ready for experiment. The detachable loading type carrier structure is adopted, which facilitates the staff to select different catalytic combustion catalysts according to different testing requirements, and also facilitates the removal of the catalyst carrier 41 for maintenance and replacement after testing and in the case of not being used, so that the overall service life is improved. The docking position of the burner 4 and the mixing pipe 3, and the other combined assembly positions are all provided with graphite metal composite gasket structures for sealing and preventing gas channeling, and the combined connection positions are fastened and connected through the flanges welded on the side walls, so that the connection stability and sealing property are ensured.

[0027] Further, after the test starts, first start the fan 1 to provide air intake, at this time the gas supply end o connected by the gas connecting pipe 31, such as a high-pressure gas cylinder, is in a closed state. The heating device 5 is used to preheat the burner 4 to make the temperature of the internal catalyst carrier 41 close to the temperature required for catalytic combustion. Exemplarily, in the embodiment of the utility model, the heating device 5 comprises an adjustable power supply 51 and a first heating wire 52, the adjustable power supply 51 is electrically connected with the first heating wire 52, and the first heating wire 52 is wound on the outer side wall of the burner 4. The first heating wire 52 wound in a spiral shape on the outer side wall of the burner 4 is used to uniformly heat the burner 4, and the heating power and breaking of the first heating wire 52 are flexibly controlled by using the adjustable power supply 51, so that the rapid response and adaptation of different test conditions are met while the heating efficiency is ensured. While heating, the temperature of the catalyst carrier 41 is confirmed by using the carrier temperature sensor 42 and the temperature sensor n arranged at the other end of the burner 4, and the power-off time of the first heating wire 52 is determined according to the ignition temperature T i of the selected gas to be introduced, and the ignition temperature of the catalytic combustion of the flammable organic structure is generally between 200 DEG C and 400 DEG C, so that the first heating wire 52 can be powered off when the carrier temperature reaches T g , and T g can be determined by T g =T i -200≤300 DEG C.

[0028] When the carrier temperature approaches the ignition temperature of the gas to be introduced, the heating device 5 is turned off, and the burner 4 and the newly introduced air are heated by the residual heat of the first heating wire 52. At this time, the temperature has approached the catalytic combustion ignition temperature, the gas supply end o is used to introduce the gas into the mixing pipe 3 by the gas connecting pipe 31, and the external air introduced into the heat exchanger 2 is mixed into the burner 4. With the increase of the temperature in the burner 4, the mixed gas passing through the catalyst carrier 41 is ignited when the temperature reaches the ignition temperature, and the exhaust gas after combustion in the burner 4 enters the hot flow side of the heat exchanger 2 to heat the newly introduced air, simulates the operation of the heat exchanger in the SOFC system, effectively avoids the waste of heat generated by combustion, avoids the blowout of the catalytic combustion reaction caused by the lower temperature of the mixer, and avoids the stable maintenance of the combustion, and is inconsistent with the actual SOFC system. Exemplarily, in this step, the gas flow is determined according to the preset air excess coefficient, that is, the ratio of the actual air-fuel ratio to the theoretical air-fuel ratio, wherein the theoretical air-fuel ratio is a preset value determined before the test, and the actual air-fuel ratio can be controlled and confirmed by the gas flow meter arranged at the gas supply end o and the air flow meter arranged at the external air inlet position, which is not described herein.

[0029] Afterwards, the pressure sensor m and the temperature sensor n arranged at both ends of the burner 4 are used for sensing, and the carrier temperature, the front end pressure and the front end temperature at one end of the burner 4, and the rear end pressure and the rear end temperature at the other end of the burner 4 are recorded in real time by the host computer. Meanwhile, the plug on the observation device 6 at the rear end of the burner 4 is opened. For example, in the embodiment of the utility model, the observation device 6 is a high-temperature observation mirror, and the tester can directly observe the working condition of the catalyst carrier 41 through the observation device 6, for example, the catalyst carrier 41 coated with the catalyst emits light when combustion occurs. Finally, the light-off temperature is confirmed based on the rear end temperature-time curve and the working condition of the catalyst carrier 41. When the slope of the rear end temperature-time curve changes obviously during the observation of the recording data by the host computer, it indicates that the internal part of the carrier has been ignited, and the carrier temperature T 20 at this time is recorded. The catalyst carrier 41 in the observation device 6 is continuously monitored, and when the catalyst carrier 41 suddenly emits light at a certain time or the slope of the rear end temperature-time curve rises steeply, it indicates that the internal part of the catalyst carrier 41 has been ignited, and the catalytic combustion reaction fully occurs, and the carrier temperature T 21 at this time is recorded. Thus, the light-off temperature T B = (T 20 + T 21 ) / 2 can be finally defined. By comparing the light-off temperature T B with the temperature of the gas introduced into the burner, the performance of the catalyst can be verified.

[0030] The SOFC catalytic combustion test device provided by the embodiment of the utility model is used for simplifying and simulating part of the structure of the SOFC system, separately selecting the parts related to the structure of the burner, independently connecting the parts through the pipeline, and setting the corresponding sensors and other detection devices at the related positions to form the SOFC catalytic combustion test device, so as to simulate the actual operation condition of the burner in the SOFC system and verify the performance of the catalyst in the burner. The device is simple to assemble and set, and can set the catalyst to be tested in the burner 4 through the catalyst carrier 41 according to different test requirements, and introduce the external air and the gas for combustion test. Meanwhile, the high-temperature tail gas at the rear end of the burner 4 can be introduced into the hot stream side of the heat exchanger 2 to control the inlet temperature of the air introduced from the cold stream side by the fan 1, so that the actual working condition of the burner in the SOFC system under different conditions can be simulated simply and quickly, and the performance verification test of the catalyst can be realized.

[0031] Optionally, the heat stream outlet of the heat exchanger 2 is provided with a tail gas proportional valve 7. Exemplarily, in the embodiment of the utility model, by setting the tail gas proportional valve 7 at the heat stream outlet of the heat exchanger 2, the flow and speed of the combustion tail gas discharged from the heat exchanger 2 can be flexibly controlled to provide different heat exchange uniform temperature effects.

[0032] Optionally, it further comprises a tail gas collection bag 8 and a bypass proportional valve 9, the inlet of the bypass proportional valve 9 is connected to the pipeline between the other end of the burner 4 and the heat stream inlet of the heat exchanger 2, and the outlet of the bypass proportional valve 9 is connected to the tail gas collection bag 8. Further, in combination with the aforementioned tail gas proportional valve 7, a bypass composed of the bypass proportional valve 9 and the tail gas collection bag 8 is additionally arranged at the outlet section of the burner 4, and the outlet of the bypass proportional valve 9 is connected to the tail gas collection bag 8 through a hose, which facilitates the placement and flexible arrangement of the experimental equipment. The bypass can be arranged to further perform the complete conversion temperature test on the basis of the light-off temperature test of the catalyst using the test device. The steps are as follows:

[0033] In the light-off temperature test, the gas supply end o is used to introduce the gas into the mixing pipeline 3 through the gas connecting pipe 31, and the gas is mixed with the external air introduced into the heat stream side of the heat exchanger 2 to enter the burner 4 for combustion, and the catalytic combustion reaction in the catalyst carrier 41 fully occurs, and the carrier temperature reaches T21. When the plug seal observation device is used, as the combustion proceeds, the newly introduced air will be continuously heated by the combustion tail gas, and the outlet tail gas temperature of the catalyst carrier 41 and the burner 4 will also rise. In order to confirm the complete conversion temperature of the fuel, the bypass proportional valve 9 needs to be opened and the tail gas proportional valve 7 needs to be closed at this time, so that the combustion tail gas can enter the tail gas collection bag 8 through the bypass proportional valve 9, and the gas chromatograph is used to analyze the fuel gas concentration and CO concentration in the tail gas components in the bag, so as to judge whether the fuel gas is completely oxidized. The tail gas collection frequency is divided according to the temperature. Considering that the temperature rate is relatively fast during the combustion process, the temperature is divided into T 21 700℃, and above 700℃, the temperature rising rate will decrease, and sampling is performed every 25℃ until the temperature is stable.

[0034] The tail gas products collected by the tail gas collection bag 8 under different combustion temperature intervals are analyzed by using the gas chromatograph, and the detection sequence is performed from low to high temperature. If the CO and fuel gas concentration contents in a certain temperature interval are lower than 5%, it is considered that the fuel gas in the temperature interval is completely converted, and the median value of the temperature interval is the complete conversion temperature T trans .

[0035] Further, using the catalytic combustion test device, on the basis of completing the aforementioned light-off temperature test and complete conversion temperature test, the extinguishing limit test can also be realized. The steps are as follows:

[0036] When the combustion reaches a stable condition, the bypass proportional valve 9 is closed, and the gas flow m fuel The excess air coefficient λ is adjusted, and λ increases with the decrease of m fuel The adjustment value of λ does not exceed 0.2 each time, and after the adjustment, the combustion is maintained for twenty minutes, the curve slope of the rear end temperature of the burner 4 with time is observed, if the temperature curve appears a large decrease, the excess air coefficient λ at this time and the stable temperature value before the burner 4 is extinguished are recorded, and the stable temperature value is the extinction limit temperature T extin .

[0037] The test device provided by the embodiment of the utility model can realize low-cost and fast catalytic combustion catalyst performance test, test the light-off temperature, complete conversion temperature and extinction limit, and can also consider the test of various different gases and different SOFC system conditions.

[0038] Optionally, the connection part of the gas connection pipe 31 and the mixing pipe 3 is provided with an ejector 32. Illustratively, in the embodiment of the utility model, by arranging the ejector 32 at the inlet end of the high-pressure gas, the gas forms a low-pressure area to eject air in the mixing chamber after entering, so that the air inlet of the fan 1 on the air introduction side is reduced, and the required power consumption of the fan 1 is reduced under the same air inlet amount.

[0039] Optionally, an outlet temperature sensor 21 is arranged between the cold flow outlet of the heat exchanger 2 and the ejector 32. Illustratively, in the embodiment of the utility model, by arranging the outlet temperature sensor 21 at the cold flow outlet end of the heat exchanger 2, the temperature of the air introduced by the fan 1 and preheated in the heat exchanger 2 can be detected, which is convenient for the staff to record for experimental record and used as a reference index for overall adjustment.

[0040] Optionally, a second electric heating wire 53 is further included, and the second electric heating wire 53 is wound on the heat exchanger 2 and electrically connected with the adjustable power supply 51. Illustratively, in the embodiment of the utility model, the heat exchanger 2 adopts a shell-and-tube heat exchanger, which uses the tube bundle wall surface enclosed in the shell as a heat transfer surface to realize indirect heat exchange between the external air on the cold flow side and the high-temperature combustion tail gas on the hot flow side. Further, in addition to using the high-temperature tail gas of the burner 4 to introduce the waste heat of the introduced air in the heat exchanger 2, the electric heating wire can also be wound on the heat exchanger 2, and the heating is controlled by the adjustable power supply 51 under the data support of the outlet temperature sensor 21 to perform heat compensation, so as to ensure the simulation accuracy of the stack tail gas temperature.

[0041] Unless otherwise defined, technical terms or scientific terms used herein shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms "first", "second", and similar terms do not denote any order, quantity, or importance, but are used to distinguish one element from another, and the terms "a" or "an" do not denote a limitation of quantity but denote the presence of at least one. The terms "comprising", "including", and similar terms do not denote the presence of the elements or objects followed by the terms "comprising", "including", and similar terms, and the equivalent thereof, but do not exclude the presence of other elements or objects. The terms "connected" or "coupled" do not denote a direct or mechanical connection or coupling, but can include an electrical connection or coupling, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like are used only to indicate relative positions, and can change when the absolute positions of the described objects change.

[0042] The above description is only optional embodiments of the application, and is not intended to limit the application. Any modification, equivalent replacement, improvement, and the like made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A catalytic combustion test device for SOFCs, characterized by comprising: The utility model relates to a kind of gas heating device, including: Fan (1), heat exchanger (2), mixing pipe (3), burner (4), heating device (5) and observation device (6), The inlet end of the fan (1) is used to communicate with the outside air, the outlet end of the fan (1) is connected with the cold stream inlet of the heat exchanger (2), the cold stream outlet of the heat exchanger (2) is connected with one end of the burner (4) through the mixing pipe (3), the mixing pipe (3) is provided with a gas connection pipe (31) for connecting the gas supply end, the burner (4) is provided with a catalyst carrier (41), the other end of the burner (4) is connected with the hot stream inlet of the heat exchanger (2), the burner (4) is provided with a carrier temperature sensor (42) connected with the catalyst carrier (41), the heating device (5) is connected with the burner (4), both ends of the burner (4) are provided with pressure sensors (m) and temperature sensors (n), and the observation device (6) is connected with the inner cavity of the burner (4).

2. The catalytic combustion test device for SOFC according to claim 1, characterized by, The catalyst carrier (41) is detachably connected with the inner cavity of the burner (4).

3. The catalytic combustion test device for SOFC according to claim 1, characterized by, The hot stream outlet of the heat exchanger (2) is provided with an exhaust gas proportional valve (7).

4. The catalytic combustion test device for SOFC according to claim 3, characterized by It also includes an exhaust gas collection bag (8) and a bypass proportional valve (9), the inlet of the bypass proportional valve (9) is connected with the pipe between the other end of the burner (4) and the hot stream inlet of the heat exchanger (2), and the outlet of the bypass proportional valve (9) is connected with the exhaust gas collection bag (8).

5. The catalytic combustion test device for SOFCs according to claim 4, characterized by The outlet of the bypass proportional valve (9) and the exhaust gas collection bag (8) are connected by a hose.

6. The catalytic combustion test device for SOFCs according to claim 1, characterized by The connection between the gas connection pipe (31) and the mixing pipe (3) is provided with an ejector (32).

7. The catalytic combustion test device for SOFCs according to claim 6, characterized by An outlet temperature sensor (21) is arranged between the cold stream outlet of the heat exchanger (2) and the ejector (32).

8. The catalytic combustion test device for SOFCs according to claim 1, characterized by The heating device (5) includes an adjustable power supply (51) and a first heating wire (52), the adjustable power supply (51) is electrically connected with the first heating wire (52), and the first heating wire (52) is wound on the outer side wall of the burner (4).

9. The catalytic combustion test device for SOFCs according to claim 8, characterized by It also includes a second heating wire (53), which is wound on the heat exchanger (2) and electrically connected with the adjustable power supply (51).

10. The catalytic combustion test device for SOFCs according to claim 9, characterized by The heat exchanger (2) is a shell-and-tube heat exchanger.

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