Gas dew point adjusting device

Abstract

The utility model discloses a gas dew point adjusting device, relates to the field of fuel cells, and solves the problem of how to improve the high and low dew point adjusting efficiency of a fuel cell test system. Comprising a gas filtering unit, a flow control unit, a switching unit, a humidifying unit, a mixing unit and a temperature control unit, wherein the switching unit comprises a dry gas branch, a wet gas branch and a dry-wet switching branch, and the dry-wet switching branch can be flexibly switched between the dry gas branch and the wet gas branch; according to the utility model, the dew point temperature of the gas entering the electric pile is adjusted by controlling the flow ratio of the dry gas to the gas entering the humidifying box, and the quick flow distribution of the dry gas and the wet gas in the fuel cell test system is realized by utilizing the three-way valve, so that the utilization rate of system components is improved, and the occupied space is reduced; the use efficiency of the equipment is greatly improved, and the cost of the system is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of fuel cells and relates to a gas dew point regulating device. Background Technology

[0002] Fuel cells are the fourth generation of power generation technology after nuclear energy. They can directly convert chemical energy into electrical energy, are unaffected by the Carnot cycle, and are characterized by high efficiency and cleanliness. Proton exchange membrane fuel cells require fuel humidification due to the special nature of their membranes to improve their power output. Fuel cell testing systems are equipment used to evaluate and test fuel cell performance, and are applied in the development and testing of fuel cells.

[0003] In the development and testing of fuel cells, it is necessary to simulate various operating environments and parameters. High dynamic response and efficient humidification control are key to accurate testing and evaluation. While providing a suitable working environment for the fuel cell, the test system's own dew point switching speed under different operating conditions is particularly important for evaluating the fuel cell's response speed and operation under varying conditions.

[0004] Currently, humidification technologies in fuel cell testing systems primarily employ bubbling humidification and spray humidification. Bubbling humidification, due to the heat capacity of the humidifying water, has a slow response to the set temperature, failing to meet the requirement for rapid humidification. Spray humidification, on the other hand, contains small droplets in the humidified gas, affecting the humidification effect. Adjusting the heating power by measuring the temperature of the heating plate may result in incomplete water mist evaporation or overheating of the humidified gas. Furthermore, fluctuations in water flow rate and heating tube power during adjustment can cause significant changes in humidity. Therefore, both of these humidification methods have slow response times to dew point changes and cannot achieve high dynamic adjustment. A new method for rapidly adjusting the dew point is needed.

[0005] Patent application CN109361002A discloses a humidifier for a high-power fuel cell test bench. The humidifier includes a bubbling humidification zone, a spray humidification zone above the bubbling humidification zone, and a water storage zone below the bubbling humidification zone. A space is left between the bubbling and spray humidification zones. A gas inlet is located at the bottom of the bubbling humidification zone, a gas outlet and a deionized water inlet are located at the top of the spray humidification zone, and a deionized water outlet is located at the bottom of the water storage zone. The deionized water inlet and outlet are connected by an external pipe. This invention combines bubbling and spray humidification to achieve good humidification. The high specific surface area packing in the spray humidification zone enables efficient humidification while preventing liquid water from entering the fuel cell. However, the heat capacity of water cannot achieve a high dynamic response when the temperature drops from a high dew point to a low dew point.

[0006] Patent application CN116598537A discloses a method for rapidly controlling the relative humidity of a fuel cell. This method involves controlling the flow rates of dry and wet gases using hydrogen / air flow control, controlling the dew point temperature of the wet gases, and mixing different proportions of dry and wet gases to rapidly adjust the humidity of the hydrogen / air entering the fuel cell. Simultaneously, the temperature of the gases entering the fuel cell is controlled, thereby achieving rapid humidity adjustment. By controlling the flow rates of dry and wet gases using hydrogen / air flow control, and by displaying and controlling the dew point temperature of the wet gases and the temperature of the gases entering the fuel cell using various measuring instruments, rapid and precise humidity adjustment can be achieved to meet engineering requirements. However, this method requires the same number of flow controllers for both dry and wet gases, resulting in high costs.

[0007] Existing fuel cell testing systems often use bubbling or spraying for humidification, which has the following main problems: (1) The response speed is slow when switching the gas dew point state; (2) Existing testing systems with fast humidity switching function often use the method of adding multiple flow controllers; (3) The gas flow control of existing fuel cell testing systems is a mass flow controller, which is expensive; (4) Existing fuel cell testing systems adjust the dew point temperature by raising and lowering the water temperature of the humidification box, which will cause energy waste and increase system energy consumption. Utility Model Content

[0008] The technical problem to be solved by this invention is how to improve the efficiency of high and low dew point adjustment in fuel cell testing systems.

[0009] This utility model solves the above-mentioned technical problems through the following technical solution:

[0010] A gas dew point regulating device includes a gas filtration unit, a flow control unit, a switching unit, a humidification unit, a mixing unit, and a temperature control unit. The gas filtration unit, flow control unit, switching unit, mixing unit, and temperature control unit are connected in sequence. The connection between the switching unit and the mixing unit is divided into two paths. One path connects the switching unit directly to the mixing unit, and the other path also includes a humidification unit. The switching unit is first connected to the humidification unit, and then the humidification unit is connected to the mixing unit.

[0011] This utility model discloses a gas dew point regulating device that employs multiple gas paths, including a dry gas branch, a wet gas branch, and a dry-wet switching branch. By utilizing a three-way valve, it achieves rapid distribution of dry and wet gas flow rates in the fuel cell testing system, improving the utilization rate of system components and reducing the space occupied. This significantly improves the efficiency of the equipment and reduces system costs. Furthermore, it eliminates the need to change the water temperature in the humidification chamber; only the intake volume of the dry and wet paths needs to be controlled and adjusted. This accelerates the switching speed of gas at high and low dew points, resulting in a fast response speed, reduced system energy consumption, and lower equipment costs.

[0012] Preferably, the flow control unit includes a first proportional valve (31), a second proportional valve (32), a third proportional valve (33), a fourth proportional valve (34), a first flow meter (35), a second flow meter (36), a third flow meter (37), and a fourth flow meter (38); one end of the first proportional valve (31), one end of the second proportional valve (32), one end of the third proportional valve (33), and one end of the fourth proportional valve (34) are connected to the gas filtration unit; the other end of the first proportional valve (31) is connected to one end of the first flow meter (35); the other end of the second proportional valve (32) is connected to one end of the second flow meter (36); the other end of the third proportional valve (33) is connected to one end of the third flow meter (37); the other end of the fourth proportional valve (34) is connected to one end of the fourth flow meter (38); and the other ends of the first flow meter (35), the second flow meter (36), the third flow meter (37), and the fourth flow meter (38) are connected to the switching unit.

[0013] Beneficial effects: By using a proportional valve and flow meter method for gas flow monitoring, the cost is low and it is suitable for low-cost testing systems for high-power fuel cell stacks. At the same time, by controlling the flow ratio of dry gas and gas entering the humidification chamber through a proportional valve and flow meter method, the dew point temperature of the gas entering the fuel cell stack can be adjusted without changing the water temperature of the humidification chamber. This accelerates the switching speed of the gas at high and low dew points, resulting in fast response speed, reduced system energy consumption, and further reduction of equipment costs.

[0014] Preferably, the flow control unit includes a first flow controller (3), a second flow controller (4), a third flow controller (5), and a fourth flow controller (6); one end of the first flow controller (3), one end of the second flow controller (4), one end of the third flow controller (5), and one end of the fourth flow controller (6) are connected to the gas filtration unit, and the other end of the first flow controller (3), the other end of the second flow controller (4), the other end of the third flow controller (5), and the other end of the fourth flow controller (6) are connected to the switching unit.

[0015] Beneficial effects: By monitoring the gas flow rate through the flow controller, the flow ratio of dry gas and gas entering the humidification chamber can be controlled to adjust the dew point temperature of the gas entering the fuel cell stack. This eliminates the need to change the water temperature in the humidification chamber, accelerates the switching speed of the gas at high and low dew points, provides a fast response, reduces system energy consumption, and further reduces equipment costs.

[0016] Preferably, the switching unit includes a first three-way valve (7) and a second three-way valve (8); the input end of the first three-way valve (7) is connected to the other end of the second flow meter (36), the input end of the second three-way valve (8) is connected to the other end of the third flow meter (37), one output end of the first three-way valve (7) and one output end of the second three-way valve (8) are connected together with the other end of the first flow meter (35) to access the mixing unit, and the other output end of the first three-way valve (7) and the other output end of the second three-way valve (8) are connected together with the other end of the fourth flow meter (38) to access the humidification unit.

[0017] Preferably, the switching unit includes a first three-way valve (7) and a second three-way valve (8); the input end of the first three-way valve (7) is connected to the other end of the second flow controller (4), the input end of the second three-way valve (8) is connected to the other end of the third flow controller (5), one output end of the first three-way valve (7) and one output end of the second three-way valve (8) are connected to the other end of the first flow controller (3) and connected to the mixing unit, and the other output end of the first three-way valve (7) and the other output end of the second three-way valve (8) are connected to the other end of the fourth flow controller (6) and connected to the humidification unit.

[0018] Preferably, the gas filtration unit includes a filter (1) and a first pressure sensor (2); the filter (1) is connected to one end of the first pressure sensor (2), and the other end of the first pressure sensor (2) is connected to one end of the first proportional valve (31), one end of the second proportional valve (32), one end of the third proportional valve (33), and one end of the fourth proportional valve (34).

[0019] Preferably, the humidification unit includes a second check valve (10), a second pressure sensor (11), a humidifier, a water supply valve (12), a third check valve (13), a drain valve (14), a second temperature sensor (17), and a fourth pressure sensor (18); one end of the second check valve (10) is connected to the humidification branch of the switching unit, the other end of the second check valve (10) is connected to one end of the second pressure sensor (11), the other end of the second pressure sensor (11) is connected to the input end of the humidifier, the humidifier also has a water supply end and a drain end, the water supply valve (12) is connected to one end of the third check valve (13), the other end of the third check valve (13) is connected to the water supply end of the humidifier, the drain end of the humidifier is connected to the drain valve (14), the output end of the humidifier is connected to one end of the second temperature sensor (17), the other end of the second temperature sensor (17) is connected to one end of the fourth pressure sensor (18), and the other end of the fourth pressure sensor (18) is connected to the mixing unit.

[0020] Preferably, the humidification unit further includes a third pressure sensor (15) and a first temperature sensor (16), which are mounted on the side wall of the humidifier.

[0021] Preferably, it also includes a fuel cell stack, a tailpipe cooling unit, a pressure control unit, and a gas-liquid separation unit connected in sequence after the temperature control unit.

[0022] Preferably, it also includes a detection unit before and after the fuel cell stack, one end of which is located between the temperature control unit and the fuel cell stack connection line, and the other end of which is located between the fuel cell stack and the tailpipe cooling unit connection line. Attached Figure Description

[0023] Figure 1 This is a flowchart of a gas dew point regulating device according to Embodiment 1 of this utility model;

[0024] Figure 2 This is a connection structure diagram of a gas dew point regulating device according to Embodiment 1 of this utility model;

[0025] Figure 3 This is a connection structure diagram of a gas dew point regulating device according to Embodiment 2 of this utility model;

[0026] Figure 4 This is a flowchart of a gas dew point regulating device according to Embodiment 3 of this utility model;

[0027] Figure 5 This is a connection structure diagram of a gas dew point regulating device according to Embodiment 3 of this utility model;

[0028] Figure 6 This is a connection structure diagram of a gas dew point regulating device according to Embodiment 4 of this utility model.

[0029] The following are the labels in the diagram: Filter 1, First Pressure Sensor 2, First Flow Controller 3, Second Flow Controller 4, Third Flow Controller 5, Fourth Flow Controller 6, First Three-Way Valve 7, Second Three-Way Valve 8, First Check Valve 9, Second Check Valve 10, Second Pressure Sensor 11, Water Inlet Valve 12, Third Check Valve 13, Drain Valve 14, Third Pressure Sensor 15, First Temperature Sensor 16, Second Temperature Sensor 17, Fourth Pressure Sensor 18, Fourth Check Valve 19, Fifth Pressure Sensor 20, Third Temperature Sensor 21, Heater 22, Sixth Pressure Sensor 23, Fourth Temperature Sensor 24, Dew Point Sensor 25, Seventh Pressure Sensor 26, Fifth Temperature Sensor 27, Heat Exchanger 28, Back Pressure Valve 29, Tail Outlet 30, First Proportional Valve 31, Second Proportional Valve 32, Third Proportional Valve 33, Fourth Proportional Valve 34, First Flow Meter 35, Second Flow Meter 36, Third Flow Meter 37, Fourth Flow Meter 38. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments:

[0032] Example 1

[0033] like Figure 1 The diagram shows a flowchart of a gas dew point regulating device according to Embodiment 1 of this utility model. The system for regulating gas dew point temperature according to this utility model includes a gas filtration unit, a flow control unit, a switching unit, a humidification unit, a mixing unit, and a temperature control unit. The gas filtration unit, flow control unit, switching unit, humidification unit, mixing unit, and temperature control unit are connected in sequence. The switching unit outputs gas in two paths: one is a dry gas branch directly connected to the input of the mixing unit, and the other is a humid gas branch including the humidification unit. The gas is first humidified by the humidification unit and then input into the mixing unit for mixing. The output of the mixing unit is connected to the temperature control unit.

[0034] like Figure 2 The diagram shows the system connection structure of a gas dew point regulating device according to Embodiment 1 of this utility model. The gas filtration unit includes a filter 1 and a first pressure sensor 2. The flow control unit includes a first proportional valve 31, a second proportional valve 32, a third proportional valve 33, a fourth proportional valve 34, a first flow meter 35, a second flow meter 36, a third flow meter 37, and a fourth flow meter 38. The switching unit includes a first three-way valve 7 and a second three-way valve 8. The humidification unit includes a second check valve 10, a second pressure sensor 11, a humidifier, a water supply valve 12, a third check valve 13, a drain valve 14, a third pressure sensor 15, a first temperature sensor 16, a second temperature sensor 17, and a fourth pressure sensor 18. The mixing unit includes a first check valve 9, a fourth check valve 19, a fifth pressure sensor 20, and a third temperature sensor 21. The temperature control unit includes a heater 22.

[0035] The hydrogen / air enters the system through one end of filter 1. The other end of filter 1 is connected to one end of the first pressure sensor 2. The other end of the first pressure sensor 2 is connected to one end of the first proportional valve 31, one end of the second proportional valve 32, one end of the third proportional valve 33, and one end of the fourth proportional valve 34. The other end of the first proportional valve 31 is connected to one end of the first flow meter 35. The other end of the second proportional valve 32 is connected to one end of the second flow meter 36. The other end of the third proportional valve 33 is connected to one end of the third flow meter 37. The other end of the fourth proportional valve 34 is connected to one end of the fourth flow meter 38. The other end of the first flow meter 35 is connected to one output terminal of the first three-way valve 7, one output terminal of the second three-way valve 8, and the input terminal of the first check valve 9. The other end of the second flow meter 36 is connected to the input terminal of the first three-way valve 7. The other end of the third flow meter 37 is connected to the input terminal of the second three-way valve 8. The other end of the fourth flow meter 38 is connected to one of the other output terminals of the first three-way valve 7. The first check valve 9 is connected to the output of the second check valve 19 and one end of the fifth pressure sensor 20. The output of the second check valve 10 is connected to one end of the second pressure sensor 11. The other end of the second pressure sensor 11 is connected to the input of the humidifier. The humidifier also has a water supply end and a drain end. The water supply is connected to the input of the third check valve 13 via the water supply valve 12. The output of the third check valve 13 is connected to the water supply end of the humidifier. The humidifier drains through the drain end via the drain valve 14. The humidifier is also equipped with a third pressure sensor 15 and a first temperature sensor 16. The third pressure sensor 15 and the first temperature sensor 16 are installed on the lower side wall of the humidifier. The output of the humidifier is connected in sequence to the input of the second temperature sensor 17, the fourth pressure sensor 18 and the fourth check valve 19. The other end of the fifth pressure sensor 20 is connected to the third temperature sensor 21 and then connected to the heater 22.

[0036] In this embodiment, the filter 1 is located in front of several proportional valves and flow meters, and is used to filter hydrogen or air and protect the flow meters; the first pressure sensor 2 is located in front of the filter 1 and is used to monitor the pressure of hydrogen or air before it enters the proportional valve.

[0037] The first proportional valve 31, the second proportional valve 32, the third proportional valve 33, and the fourth proportional valve 34 are pneumatic proportional valves, electromagnetic proportional valves, electric proportional valves, and electro-hydraulic proportional valves. In this embodiment, the electromagnetic proportional valve is preferred.

[0038] The first proportional valve 31, second proportional valve 32, third proportional valve 33, and fourth proportional valve 34 are connected to the first flow meter 35, second flow meter 36, third flow meter 37, and fourth flow meter 38 at their rear ends. These flow meters are used to detect gas flow rate and, together with the opening of the first proportional valve 31 and second proportional valve 32 at the front end, perform PID regulation to control the gas flow input. Simultaneously, the outlet flow direction of the second flow meter 36 and third flow meter 37 is switched and controlled by a three-way valve. When there is a difference between the dry gas and the wet gas and the required gas dew point temperature value for system testing, dry gas and wet gas are simultaneously introduced to improve gas input efficiency. In operation, the switching unit and the mixing unit are directly connected, and the switching unit is also connected to the mixing unit through the humidification unit. At this time, the switching unit flexibly adjusts its output according to the demand for dry or wet gas. When the gas required for system testing does not require humidification, the input of wet gas is stopped, and only dry gas is output. That is, the switching unit and the mixing unit are directly connected, and the switching unit and the humidification unit are not connected. When the dew point temperature of the wet gas meets the dew point temperature required for the gas for system testing, the input of dry gas is stopped, and only wet gas is input. That is, the switching unit and the mixing unit are not connected, and the switching unit is connected to the mixing unit through the humidification unit.

[0039] Preferably, the three-way valve is a pneumatic valve or an electric valve, with the same flow capacity in different directions and no dead zone.

[0040] The first check valve 9 is located in the dry gas branch to prevent gas backflow.

[0041] The second check valve 10 is located in the gas inlet pipe before the humidifier to prevent water from entering the flow meter and causing damage.

[0042] The humidifier can be a bubble humidifier, a spray humidifier, a combination of bubble and spray humidifier, a steam humidifier, etc. In this embodiment, a combination of bubble and spray humidifier is preferred.

[0043] The water supply valve 12 can be a manual valve, an electric valve, a pneumatic valve, a solenoid valve, etc. In this embodiment, it is preferably an electric valve or a solenoid valve.

[0044] The third check valve 13 is located at the rear end of the water supply valve 12 to prevent water pressure impact from damaging the front valve.

[0045] Preferably, the humidifier in this embodiment includes a bubbling spray device, a liquid level sensor, a third pressure sensor 15, a first temperature sensor 16, etc. The sensors are used to detect the liquid level, pressure and temperature, respectively. In addition, the top of the humidifier also has a safety pressure relief valve to prevent the internal pressure of the humidifier from being too different from the external pressure.

[0046] The second temperature sensor 17 and the fourth pressure sensor 18 are located at the humidifier outlet and are used to detect the outlet gas and pressure. At the same time, the second temperature sensor 17 can replace the dew point temperature sensor for monitoring the dew point temperature. When the second temperature sensor 17 detects that the dew point temperature has reached the required value for testing, the input of the humid gas path will be shut off, and only the dry gas branch will work until the required amount of dry gas for testing is reached.

[0047] The fourth check valve 19 is located at the rear end of the fourth pressure sensor 18 and the front end of the dry-wet mixture, and is used to prevent dry air from entering the humidifier.

[0048] The fifth pressure sensor 20 and the third temperature sensor 21 are located at the front end of the heater 22 and are used to monitor the pressure and temperature of the gas before it enters the heater.

[0049] The preferred heater 22 can be an electric heater, a plate heat exchanger, etc. The heater 22 heats the gas to the temperature required for the test according to the test requirements.

[0050] Example 2

[0051] like Figure 3 The diagram shows a flowchart of a gas dew point regulating device according to Embodiment 2 of this utility model. The difference between Embodiment 2 and Embodiment 1 is that the flow control unit in Embodiment 2 includes a first flow controller 3, a second flow controller 4, a third flow controller 5, and a fourth flow controller 6. One end of the first flow controller 3, one end of the second flow controller 4, one end of the third flow controller 5, and one end of the fourth flow controller 6 are connected to the other end of the first pressure sensor 2. The other end of the first flow controller 3 is connected to one of the output terminals of the first three-way valve 7, one of the output terminals of the second three-way valve 8, and the input terminal of the first check valve 9. The other end of the second flow controller 4 is connected to the input terminal of the first three-way valve 7. The other end of the third flow controller 5 is connected to the input terminal of the second three-way valve 8. The other end of the fourth flow controller 6 is connected to the other output terminal of the first three-way valve 7 and the other output terminal of the second three-way valve 8, and then connected to the input terminal of the second check valve 10.

[0052] In this second embodiment, several flow controllers are connected in parallel. In addition to meeting the maximum flow rate, an extra dry gas flow controller is added. The preferred choice is that the first flow controller 3 is a dry gas flow controller, while the second flow controller 4, the third flow controller 5, and the fourth flow controller 6 are defaulted to being wet gas flow controllers.

[0053] Preferably, the flow controller uses a mass flow controller, which provides more precise control over the gas flow rate.

[0054] The outlet flow direction of the second flow controller 4 and the third flow controller 5 is controlled by a three-way valve.

[0055] Here's an explanation of dew point temperature: Dew point temperature is the temperature at which air reaches saturation under constant water vapor content and pressure. This invention calculates the water vapor content (m³) and gas flow rate (V) per unit gas flow rate using the set dew point temperature (T) and pressure (P). The temperature at the humidifier outlet can be considered the dew point temperature (T₁) of the humidification branch, from which the water vapor content per unit gas flow rate can be calculated, and thus the humidification gas flow rate V can be derived. 湿 Then there is dry gas flow rate V 干 =VV 湿 This allows us to determine the required dry gas flow rate for the test.

[0056] When the system is working, the dry gas branch and the wet gas branch work simultaneously. After determining the gas dew point temperature and gas flow rate required for the test, the wet gas branch is opened and the gas in the wet gas branch is humidified through the humidifier based on the calculated dry gas and wet gas flow rates (the three-way switching valve defaults to the wet gas direction). The humidifier continues to humidify until the gas with the water vapor content required for the gas dew point temperature of the project is obtained. At the same time, based on the calculated dry gas flow rate, the dry and wet gas are mixed in the mixing unit to achieve the dew point temperature of the target gas.

[0057] When the calculated dry gas flow rate exceeds the maximum range of a single flow controller, the first three-way valve 7 starts to switch from the wet gas branch to the dry gas branch; if the two dry gas flow controllers cannot meet the dry gas flow rate, the second three-way valve 8 starts to switch from the wet gas branch to the dry gas branch until the gas dew point temperature required by the system is reached.

[0058] When the required gas dew point temperature changes during subsequent testing, the required wet and dry gas flow rates are determined again based on the changed gas dew point temperature. The above process can then be repeated. There is no need to change the humidifier water temperature; only the intake volume of the wet and dry gas paths needs to be controlled and adjusted. Furthermore, since the humidifier water temperature does not need to be changed, the system's energy consumption is reduced, the switching speed of the gas at high and low dew points is accelerated, and the response speed is fast. The use of a three-way valve to switch the dry and wet gas flow rates in the fuel cell testing system enables rapid distribution of dry and wet gas flow rates, improves the utilization rate of system components, and reduces the space occupied, greatly improving the efficiency of the equipment.

[0059] Similarly, when the flow controller is replaced with a combination of a proportional valve and a flow meter, the gas flow rate is controlled by controlling the opening of the proportional valve, and the principle of switching between dry and wet gas is the same as above.

[0060] Example 3

[0061] like Figure 4The diagram shows a flowchart of a gas dew point regulating device according to Embodiment 3 of this utility model. Embodiment 3 is a specific application of Embodiment 1. After the temperature control unit of Embodiment 1, a fuel cell stack, a tail exhaust cooling unit, a pressure control unit, and a gas-liquid separation unit are added in sequence. It also includes a detection unit before and after entering the fuel cell stack. One end of the detection unit before and after entering the fuel cell stack is located between the temperature control unit and the fuel cell stack connection line, and the other end of the detection unit before and after entering the fuel cell stack is located between the fuel cell stack and the tail exhaust cooling unit connection line.

[0062] like Figure 5 The diagram shows the connection structure of a gas dew point regulating device according to Embodiment 3 of this utility model. The fuel cell stack is a battery stack composed of multiple fuel cells, hereinafter referred to as the fuel cell stack. The detection unit before and after entering the fuel cell stack includes a sixth pressure sensor 23, a fourth temperature sensor 24, a dew point sensor 25, a seventh pressure sensor 26, and a fifth temperature sensor 27. The exhaust cooling unit includes a heat exchanger 28. The pressure control unit includes a back pressure valve 29. The gas-liquid separation unit includes an exhaust port 30. The output end of the heater 22 is sequentially connected to one end of the fuel cell stack via the sixth pressure sensor 23, the fourth temperature sensor 24, and the dew point sensor 25. The other end of the fuel cell stack is sequentially connected to the seventh pressure sensor 26, the fifth temperature sensor 27, the heat exchanger 28, the back pressure valve 29, and the exhaust port 30.

[0063] The sixth pressure sensor 23, the fourth temperature sensor 24, and the dew point sensor 25 are located before the fuel cell stack inlet and are used to detect the pressure, temperature, and dew point temperature of the gas before it enters the fuel cell stack.

[0064] The seventh pressure sensor 26 and the fifth temperature sensor 27 are located at the gas outlet of the fuel cell stack and are used to monitor pressure and temperature.

[0065] The gas exiting the fuel cell is cooled by heat exchanger 28.

[0066] The back pressure valve 29 is located at the rear end of the heat exchanger 28 and is used for pressure control of the entire test system.

[0067] The cooled exhaust gas is discharged through exhaust port 30 after gas-liquid separation.

[0068] Example 4

[0069] like Figure 6 The diagram shown is a connection structure diagram of a gas dew point regulating device according to Embodiment 4 of this utility model. Embodiment 4 corresponds to the specific application of Embodiment 2 and is similar to Embodiment 3, so it will not be described in detail here.

[0070] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A gas dew point regulating device, characterized in that, It includes a gas filtration unit, a flow control unit, a switching unit, a humidification unit, a mixing unit, and a temperature control unit. The gas filtration unit, flow control unit, switching unit, mixing unit, and temperature control unit are connected in sequence. The connection between the switching unit and the mixing unit is divided into two paths. One path connects the switching unit directly to the mixing unit, and the other path also includes a humidification unit. The switching unit is first connected to the humidification unit, and then the humidification unit is connected to the mixing unit.

2. The gas dew point regulating device according to claim 1, characterized in that, The flow control unit includes a first proportional valve (31), a second proportional valve (32), a third proportional valve (33), a fourth proportional valve (34), a first flow meter (35), a second flow meter (36), a third flow meter (37), and a fourth flow meter (38). One end of the first proportional valve (31), one end of the second proportional valve (32), one end of the third proportional valve (33), and one end of the fourth proportional valve (34) are connected to the gas filtration unit. The other end of the first proportional valve (31) is connected to one end of the first flow meter (35), the other end of the second proportional valve (32) is connected to one end of the second flow meter (36), the other end of the third proportional valve (33) is connected to one end of the third flow meter (37), and the other end of the fourth proportional valve (34) is connected to one end of the fourth flow meter (38). The other ends of the first flow meter (35), the second flow meter (36), the third flow meter (37), and the fourth flow meter (38) are connected to the switching unit.

3. The gas dew point regulating device according to claim 1, characterized in that, The flow control unit includes a first flow controller (3), a second flow controller (4), a third flow controller (5), and a fourth flow controller (6); one end of the first flow controller (3), one end of the second flow controller (4), one end of the third flow controller (5), and one end of the fourth flow controller (6) are connected to the gas filtration unit, and the other end of the first flow controller (3), the other end of the second flow controller (4), the other end of the third flow controller (5), and the other end of the fourth flow controller (6) are connected to the switching unit.

4. A gas dew point regulating device according to claim 2, characterized in that, The switching unit includes a first three-way valve (7) and a second three-way valve (8); the input end of the first three-way valve (7) is connected to the other end of the second flow meter (36), the input end of the second three-way valve (8) is connected to the other end of the third flow meter (37), one output end of the first three-way valve (7) and one output end of the second three-way valve (8) are connected to the other end of the first flow meter (35) and connected to the mixing unit, and the other output end of the first three-way valve (7) and the other output end of the second three-way valve (8) are connected to the other end of the fourth flow meter (38) and connected to the humidification unit.

5. A gas dew point regulating device according to claim 3, characterized in that, The switching unit includes a first three-way valve (7) and a second three-way valve (8); the input end of the first three-way valve (7) is connected to the other end of the second flow controller (4), the input end of the second three-way valve (8) is connected to the other end of the third flow controller (5), one of the output ends of the first three-way valve (7) and one of the output ends of the second three-way valve (8) are connected to the other end of the first flow controller (3) and connected to the mixing unit, and the other output end of the first three-way valve (7) and the other output end of the second three-way valve (8) are connected to the other end of the fourth flow controller (6) and connected to the humidification unit.

6. A gas dew point regulating device according to claim 1, characterized in that, The humidification unit includes a second check valve (10), a second pressure sensor (11), a humidifier, a water supply valve (12), a third check valve (13), a drain valve (14), a second temperature sensor (17), and a fourth pressure sensor (18). One end of the second check valve (10) is connected to the humidification branch of the switching unit, and the other end of the second check valve (10) is connected to one end of the second pressure sensor (11). The other end of the second pressure sensor (11) is connected to the input end of the humidifier. The humidifier also has a water supply end and a drain end. The water supply valve (12) is connected to one end of the third check valve (13), and the other end of the third check valve (13) is connected to the water supply end of the humidifier. The drain end of the humidifier is connected to the drain valve (14). The output end of the humidifier is connected to one end of the second temperature sensor (17), and the other end of the second temperature sensor (17) is connected to one end of the fourth pressure sensor (18). The other end of the fourth pressure sensor (18) is connected to the mixing unit.

7. A gas dew point regulating device according to claim 1, characterized in that, The humidification unit also includes a third pressure sensor (15) and a first temperature sensor (16), which are mounted on the side wall of the humidifier.

8. A gas dew point regulating device according to claim 6, characterized in that, The humidifier is a combination of bubbling and spray humidification.

9. A gas dew point regulating device according to claim 1, characterized in that, It also includes a fuel cell stack, a tailpipe cooling unit, a pressure control unit, and a gas-liquid separation unit connected in sequence after the temperature control unit.

10. A gas dew point regulating device according to claim 9, characterized in that, It also includes a detection unit before and after the fuel cell stack. One end of the detection unit is located between the temperature control unit and the fuel cell stack connection line, and the other end is located between the fuel cell stack and the tail cooling unit connection line. The detection unit before and after entering the fuel cell stack includes a sixth pressure sensor (23), a fourth temperature sensor (24), a dew point sensor (25), a seventh pressure sensor (26), and a fifth temperature sensor (27). One end of the sixth pressure sensor (23) is connected to the temperature control unit, the other end of the sixth pressure sensor (23) is connected to one end of the fourth temperature sensor (24), the other end of the fourth temperature sensor (24) is connected to one end of the dew point sensor (25), the other end of the dew point sensor (25) is connected to one end of the fuel cell stack, the other end of the fuel cell stack is connected to one end of the seventh pressure sensor (26), the other end of the seventh pressure sensor (26) is connected to one end of the fifth temperature sensor (27), and the other end of the fifth temperature sensor (27) is connected to the tail exhaust cooling unit.

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