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 problems of low high and low dew point adjusting efficiency and high equipment cost of an existing fuel cell test system. Comprising a gas filtering unit, a flow control and switching unit, a humidifying unit, a mixing unit and a temperature control unit which are sequentially connected, the flow control and switching unit outputs gas into two paths, one path is a dry gas branch directly connected with the input end of the mixing unit, and the other path is a wet gas branch comprising the humidifying unit; gas is humidified through the humidifying unit and then input into the mixing unit to be mixed. According to the utility model, a low-cost method of the proportional valve and the flowmeter is adopted to replace a flow controller, and the dew point temperature of the gas entering the galvanic pile is adjusted by controlling the flow ratio of the dry gas to the gas entering the humidifying box through the method of the proportional valve and the flowmeter, so that the water temperature of the humidifying box does not need to be changed, and the switching speed of the gas at high and low dew points is accelerated; the response speed is high, and the energy consumption of the system is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to fuel cell field relates to a kind of adjusting gas dew point device. BACKGROUND

[0002] Fuel cell is the fourth generation of power generation technology after nuclear energy, can directly convert chemical energy into electrical energy, not affected by Carnot cycle, with high efficiency, clean characteristics.Proton exchange membrane fuel cell because of its membrane particularity needs to humidify fuel, improve its power generation power.Fuel cell test system is to evaluate the equipment for testing fuel cell performance, applied to the development and testing of fuel cell.

[0003] In the development and testing process of fuel cell, various operating environments, operating parameters need to be simulated, high dynamic response, high-efficiency humidification control is the key to accurate test evaluation.The test system provides suitable working environment for fuel cell, and the dew point switching speed under different conditions is particularly important, to evaluate the response speed of fuel cell and the operation of variable working condition.

[0004] At present, the humidification technology of fuel cell test system is mainly bubble humidification and spray humidification, wherein the bubble humidification has slow response to the set temperature due to the heat capacity of humidification water, and cannot meet the rapidity requirement of humidification.The small droplets exist in the gas after spray humidification, so the humidification effect is affected, and the temperature of heating plate is measured to adjust the heating power, which may cause incomplete evaporation of water mist or overheat of moisture, and the fluctuation of water flow and heating tube power in the adjustment process will cause large change in humidity.Therefore, the response speed of these two humidification methods to dew point switching is slow, and high dynamic adjustment cannot be achieved, so a new method for quickly adjusting dew point is needed.

[0005] The invention patent application with application publication No.CN109361002A proposes a humidifier for high-power fuel cell test bench, discloses a humidifier for high-power fuel cell test bench, which comprises a bubble humidification zone, a spray humidification zone located at the upper part of the bubble humidification zone and a water storage zone located at the lower part of the bubble humidification zone, a space is left between the bubble humidification zone and the spray humidification zone, a gas inlet is arranged at the lower part of the bubble humidification zone, a gas outlet and a deionized water inlet are arranged at the top of the spray humidification zone, a deionized water outlet is arranged at the bottom of the water storage zone, and the deionized water inlet and the deionized water outlet are connected by an external pipeline.The invention adopts the combination of bubble humidification and spray humidification, can achieve good humidification effect, the high specific surface area filler in the spray humidification zone can realize high-efficiency humidification, and prevent liquid water from entering the fuel cell.However, due to the heat capacity of water, high dynamic response cannot be achieved when the dew point temperature is reduced from high to low.

[0006] The patent application with the application publication number CN116598537A discloses a method for quickly controlling the relative humidity of a fuel cell, which comprises controlling the flow rates of dry gas and wet gas to be different through hydrogen / air flow control, controlling the dew point temperature of the wet gas, and mixing the dry gas and the wet gas at different proportions to quickly adjust the humidity of hydrogen / air entering the stack, while the gas temperature entering the stack is controlled, so that the gas humidity is quickly adjusted. Through the method, the dew point temperature of the wet gas and the gas temperature entering the stack can be displayed and controlled through various measuring instruments, so that the gas humidity can be quickly and accurately adjusted to meet the engineering requirements. However, the method needs to set the same number of flow controllers for the dry gas and the wet gas, which is high in cost.

[0007] The existing fuel cell test system often uses the bubbling or spraying method for humidification, which mainly has the following problems: (1) the response speed is slow when the gas dew point state is switched; (2) in the existing test system with a quick humidity switching function, a plurality of flow controllers are often additionally added to achieve the function; (3) the gas flow control of the existing fuel cell test system is a mass flow controller, which is high in cost; (4) in the existing fuel cell test system, the dew point temperature is adjusted by the rise and fall of the water temperature of the humidification tank, which causes energy waste and increases the energy consumption of the system. Practical new type content

[0008] The technical problem to be solved by the present application is that the existing fuel cell test system has low high-low dew point adjustment efficiency and high equipment cost.

[0009] The present application solves the above technical problems through the following technical solutions:

[0010] The present application solves the above technical problems through the following technical solutions:

[0011] The present application solves the above technical problems through the following technical solutions:

[0012] Preferably, the gas filtering unit comprises a filter (1), a first pressure sensor (2); one end of the filter (1) is connected with the first pressure sensor (2), and the other end of the first pressure sensor (2) is connected with the flow control and switching unit.

[0013] Preferably, the flow control and switching unit comprises a first proportional valve (31), a second proportional valve (32), a first flow meter (35), a second flow meter (36); one end of the first proportional valve (31) and one end of the second proportional valve (32) are connected with the other end of the first pressure sensor (2), the other end of the first proportional valve (31) is connected with one end of the first flow meter (35), the other end of the second proportional valve (32) is connected with one end of the second flow meter (36), the other end of the first flow meter (35) is connected with the mixing unit, and the other end of the second flow meter (36) is connected with the humidifying unit.

[0014] Preferably, the humidifying unit comprises a second check valve (10), a second pressure sensor (11), a humidifier, a second temperature sensor (17), a fourth pressure sensor (18); one end of the second check valve (10) is connected with the other end of the second flow meter (36), the other end of the second check valve (10) is connected with one end of the second pressure sensor (11), the other end of the second pressure sensor (11) is connected with one end of the humidifier, the other end of the humidifier is connected with one end of the second temperature sensor (17), the other end of the second temperature sensor (17) is connected with one end of the fourth pressure sensor (18), and the other end of the fourth pressure sensor (18) is connected with the mixing unit.

[0015] Preferably, the mixing unit comprises a first check valve (9), a fourth check valve (19), a fifth pressure sensor (20), a third temperature sensor (21); one end of the first check valve (9) is connected with the other end of the first flow meter (35), one end of the fourth check valve (19) is connected with the other end of the fourth pressure sensor (18), the other end of the first check valve (9) and the other end of the fourth check valve (19) are connected together to be connected with one end of the fifth pressure sensor (20), the other end of the fifth pressure sensor (20) is connected with one end of the third temperature sensor (21), and the other end of the third temperature sensor (21) is connected with the temperature control unit.

[0016] Preferably, the temperature control unit includes a heater (22), a sixth pressure sensor (23), a fourth temperature sensor (24), and a dew point sensor (25); one end of the heater (22) is connected to the other end of the third temperature sensor (21), the other end of the heater (22) is connected to one end of the sixth pressure sensor (23), the other end of the sixth pressure sensor (23) is connected to one end of the fourth temperature sensor (24), and the other end of the fourth temperature sensor (24) is connected to the dew point sensor (25).

[0017] Preferably, the first proportional valve (31) and the second proportional valve (32) are electromagnetic proportional valves.

[0018] Preferably, the humidifier is a combination of bubbling and spray humidification.

[0019] Preferably, the heater (22) is an electric heater or a plate heat exchanger.

[0020] The advantages of this utility model are:

[0021] This invention uses a low-cost method of proportional valve and flow meter to replace the flow controller, which is suitable for low-cost testing systems for high-power fuel cell stacks. By controlling the flow ratio of dry gas and gas entering the humidification chamber through proportional valve and flow meter, the dew point temperature of the gas entering the fuel cell stack can be adjusted. It does not require changing the water temperature of the humidification chamber, which speeds up the switching speed of gas at high and low dew points, has a fast response speed, reduces the energy consumption of the system, and has a low equipment cost. Attached Figure Description

[0022] Figure 1 This is a flowchart of a gas dew point adjustment device according to Embodiment 1 of this utility model;

[0023] Figure 2 This is a connection structure diagram of a gas dew point adjustment device according to Embodiment 1 of this utility model. Detailed Implementation

[0024] 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.

[0025] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments:

[0026] Example 1

[0027] likeFigure 1 The diagram shown is a flowchart of a gas dew point adjustment device according to Embodiment 1 of this utility model; it includes a gas filtration unit, a flow control and switching unit, a humidification unit, a mixing unit, and a temperature control unit; the gas filtration unit is connected to the flow control and switching unit, which outputs gas into two paths, one being a dry gas branch directly connected to the input of the mixing unit, and the other being a humid gas branch containing 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.

[0028] like Figure 2 The diagram shows the connection structure of a gas dew point adjustment 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 and switching unit includes a first proportional valve 31, a second proportional valve 32, a first flow meter 35, and a second flow meter 36. The humidification unit includes a second check valve 10, a second pressure sensor 11, a humidifier, 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, a sixth pressure sensor 23, a fourth temperature sensor 24, and a dew point sensor 25. The hydrogen / air enters the device through one end of the filter 1, and the other end of the 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 and one end of the second proportional valve 32. One end of a proportional valve 31 is connected to one end of a first flow meter 35, the other end of a second proportional valve 32 is connected to one end of a second flow meter 36, the other end of the first flow meter 35 is connected to the input end of a first check valve 9, the other end of the second flow meter 36 is connected to the input end of a second check valve 10, the output end of the first check valve 9 is connected to the output end of a fourth check valve 19 and one end of a fifth pressure sensor 20, the output end of the second check valve 10 is connected to one end of a second pressure sensor 11, the other end of the second pressure sensor 11 is connected to the input end of a humidifier, the output end of the humidifier is sequentially connected to the input end of a second temperature sensor 17, a fourth pressure sensor 18 and a fourth check valve 19, the other end of the fifth pressure sensor 20 is connected to the input end of a heater 22 after being connected to the third temperature sensor 21, and the output end of the heater 22 is sequentially connected to a sixth pressure sensor 23, a fourth temperature sensor 24 and a dew point sensor 25.

[0029] The first proportional valve 31 and the second proportional valve 32 are pneumatic proportional valves, electromagnetic proportional valves, electric proportional valves, and electro-hydraulic proportional valves. In this embodiment, the electromagnetic proportional valve is preferred.

[0030] The first proportional valve 31 and the second proportional valve 32 are connected to the first flow meter 35 and the second flow meter 36 at their rear ends. These flow meters are used to detect the gas flow rate and to perform PID regulation control on the opening degree of the first proportional valve 31 and the second proportional valve 32 at the front end to control the input gas flow rate.

[0031] The first check valve 9 is located in the dry gas branch to prevent gas backflow.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] The preferred heater 22 can be an electric heater, a plate heat exchanger, etc.

[0038] The sixth pressure sensor 23, the fourth temperature sensor 24, and the dew point sensor 25 are located at the rear end of the heater 22 and are used to detect the pressure, temperature, and dew point temperature of the gas.

[0039] Working principle:

[0040] This invention calculates the water vapor content (m³) and gas flow rate (V) per unit gas flow rate by setting the dew point temperature (T) and pressure (P). The temperature at the humidifier outlet can be considered as the dew point temperature (T₁) of the moisture branch, from which the water vapor content per unit gas flow rate can be obtained. Based on the saturated water pressure at the current gas temperature, the water vapor content per unit gas flow rate of the moisture is obtained, and thus the gas flow rate V of the moisture is derived. 湿 Then there is dry gas flow rate V 干 =VV 湿 This allows you to set the value of the dry gas flow meter to the calculated flow rate.

[0041] Finally, the gas with the required dew point temperature for the test is obtained, and the gas can be heated to the required temperature using a heater.

[0042] The utility model discloses a low -cost method of proportional valve plus flowmeter replaces flow controller, is applicable to the low -cost test system of high -power electric pile, and the dew point temperature of the gas of entering electric pile is adjusted by the method of proportional valve plus flowmeter control dry gas and the flow proportion of the gas of entering humidification box, need not change the water temperature of humidification box, accelerate the switching speed of gas in high and low dew point, response speed is fast, has reduced the energy consumption of system, and the equipment cost is lower.

[0043] The above examples are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been explained in detail with reference to the foregoing examples, those skilled in the art should understand that: it still can modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A device for adjusting the dew point of a gas, characterized in that, It includes a gas filtration unit, a flow control and switching unit, a humidification unit, a mixing unit, and a temperature control unit. The gas filtration unit, flow control and switching unit, mixing unit, and temperature control unit are connected in sequence. The flow control and switching unit and the mixing unit are connected in two ways. One way is directly connected to the mixing unit, and the other way also includes a humidification unit. The flow control and switching unit is first connected to the humidification unit, and the humidification unit is then connected to the mixing unit. The gas filtration unit includes a filter (1) and a first pressure sensor (2). One end of the filter (1) is connected to the first pressure sensor (2), and the other end of the first pressure sensor (2) is connected to the flow control and switching unit.

2. The device for adjusting the gas dew point according to claim 1, characterized in that, The flow control and switching unit includes a first proportional valve (31), a second proportional valve (32), a first flow meter (35), and a second flow meter (36); one end of the first proportional valve (31) and one end of the second proportional valve (32) are connected to the other end of the first pressure sensor (2), 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 first flow meter (35) is connected to the mixing unit, and the other end of the second flow meter (36) is connected to the humidification unit.

3. The device for adjusting the gas dew point according to claim 2, characterized in that, The humidification unit includes a second check valve (10), a second pressure sensor (11), a humidifier, a second temperature sensor (17), and a fourth pressure sensor (18). One end of the second check valve (10) is connected to the other end of the second flow meter (36), 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 one end of the humidifier, the other 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.

4. The gas dew point regulating device according to claim 3, characterized in that, 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); one end of the first check valve (9) is connected to the other end of the first flow meter (35), one end of the fourth check valve (19) is connected to the other end of the fourth pressure sensor (18), the other end of the first check valve (9) and the other end of the fourth check valve (19) are connected together to one end of the fifth pressure sensor (20), the other end of the fifth pressure sensor (20) is connected to one end of the third temperature sensor (21), and the other end of the third temperature sensor (21) is connected to the temperature control unit.

5. A device for adjusting the gas dew point according to claim 4, characterized in that, The temperature control unit includes a heater (22), a sixth pressure sensor (23), a fourth temperature sensor (24), and a dew point sensor (25); one end of the heater (22) is connected to the other end of the third temperature sensor (21), the other end of the heater (22) is connected to one end of the sixth pressure sensor (23), the other end of the sixth pressure sensor (23) is connected to one end of the fourth temperature sensor (24), and the other end of the fourth temperature sensor (24) is connected to the dew point sensor (25).

6. A device for adjusting the gas dew point according to claim 2, characterized in that, The first proportional valve (31) and the second proportional valve (32) are pneumatic proportional valves, electromagnetic proportional valves, electric proportional valves, or electro-hydraulic proportional valves.

7. A device for adjusting the gas dew point according to claim 6, characterized in that, The first proportional valve (31) and the second proportional valve (32) are electromagnetic proportional valves.

8. A device for adjusting the gas dew point according to claim 3, characterized in that, The humidifier is a bubbling humidifier, a spray humidifier, a bubbling and spray humidifier, or a steam humidifier.

9. A device for adjusting the gas dew point according to claim 5, characterized in that, The heater (22) is an electric heater or a plate heat exchanger.

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