Electric pile humidifying system

Abstract

The utility model relates to the technical field of fuel cells, and particularly provides an electric pile humidifying system. The electric pile humidifying system comprises a humidifying unit, a tail discharging unit and a gas supply unit for supplying gas to the humidifying unit, the humidifying unit and the tail discharging unit are respectively communicated with an air inlet and an air outlet of the electric pile, and a circulating pipeline is communicated between the tail discharging unit and the air supply unit; gas supplied by the gas supply unit is humidified by the humidifying unit and then enters the electric pile, tail gas discharged by the electric pile enters the tail gas discharging unit, the tail gas discharging unit can separate moisture in the tail gas, and the gas with the moisture separated is conveyed to the gas supply unit through the circulating pipeline. According to the galvanic pile humidifying system disclosed by the utility model, gas for humidifying can be obtained again through separation treatment of the tail discharge unit, and is circularly conveyed to the gas supply unit to be used for humidifying again, so that the consumption of the gas for humidifying the galvanic pile is favorably saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to fuel cell technical field, especially a kind of electric pile humidification system. BACKGROUND

[0002] Fuel cell (electric pile) system needs to carry out humidification treatment to stack core before assembly, for improving proton conductivity, optimizing electrode reaction, activating membrane electrode assembly (MEA), to enhance the overall performance of fuel cell.

[0003] In prior art, the humidification treatment of electric pile is carried out by fuel cell electric pile test bench, and the humidification treatment process of stack core is included in the process of performance test of stack core.

[0004] Generally, the anode of electric pile test bench uses hydrogen, and hydrogen with set humidity is supplied into the stack core of electric pile, and hydrogen is flammable and explosive gas, which has great safety risk; at the same time, the electric pile is humidified by using fuel cell electric pile test bench, and the whole control process is relatively complex due to the need of related test of test bench, which leads to very slow humidification rate. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model aims at providing a kind of electric pile humidification system to save the consumption of gas for electric pile humidification.

[0006] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0007] A kind of electric pile humidification system, including humidification unit, tail exhaust unit, and gas supply unit for supplying gas to the humidification unit;

[0008] The gas supplied by the gas supply unit is humidified by the humidification unit and then enters the electric pile, and the tail gas discharged by the electric pile enters the tail exhaust unit, and the tail exhaust unit can separate the moisture in the tail gas and transport the gas separated from the moisture to the gas supply unit through the circulation pipeline.

[0009] Further, the humidification unit includes humidification device, and humidification pipeline communicated between the humidification device and the electric pile, and the humidification device is provided with spray pipeline;The gas supplied by the gas supply unit to the humidification device is humidified by the water sprayed by the spray pipeline and then transported to the electric pile through the humidification pipeline.

[0010] Further, the spray pipeline is led out from the bottom of the humidifying device, introduced into the inner cavity of the humidifying device for spraying, and a circulating pump is arranged on the spray pipeline; and the humidifying pipeline is led out from the top of the humidifying device.

[0011] Further, the humidifying unit further comprises a heater arranged on the spray pipeline, and water flowing through the heater in the spray pipeline can be heated to a set temperature.

[0012] Further, a water supplementing unit for supplementing water into the humidifying device is further included, and a liquid level detection device is arranged on the humidifying device.

[0013] Further, a water filtering net is arranged at the top of the inner cavity of the humidifying device, and the water filtering net is located between the spray pipeline and the humidifying pipeline to block water droplets sprayed from the spray pipeline from entering the humidifying pipeline.

[0014] Further, a safety valve is arranged on the humidifying device, and / or a vortex air pump and a temperature and humidity detection device are arranged on the humidifying pipeline.

[0015] Further, the tail exhaust unit comprises a gas-liquid separator communicated with the exhaust port of the stack and a liquid level meter for detecting the liquid level in the gas-liquid separator; and a controllable on-off exhaust pipeline is communicated with the bottom of the gas-liquid separator.

[0016] Further, the gas supply unit comprises a gas supply pipeline communicated between a nitrogen gas source and the humidifying unit, and an adjusting valve and a flow detection device arranged on the gas supply pipeline.

[0017] Further, the flow detection device comprises a first measurement branch and a second measurement branch arranged in parallel; a first shut-off valve and a first flow meter are arranged on the first measurement branch, a second shut-off valve and a second flow meter are arranged on the second measurement branch, and the range of the first flow meter is greater than that of the second flow meter.

[0018] Compared with the prior art, the present application has the following advantages:

[0019] The stack humidifying system of the present application is characterized in that the humidifying unit and the tail exhaust unit are arranged at the inlet and outlet of the stack respectively, the gas for humidifying supplied by the gas supply unit is humidified to a suitable humidity by the humidifying unit and then supplied into the stack to humidify the core of the stack, the tail gas discharged from the stack contains a large amount of water and impurities, and the tail gas is separated by the tail exhaust unit to obtain the gas for humidifying again and then supplied to the gas supply unit for humidifying, so that the consumption of the gas for humidifying the stack is reduced.

[0020] In addition, the gas passing through the humidifying unit is humidified by spraying, which has the advantages of simple structure, easy processing and construction, and good humidifying effect. The humidifying device contains a certain liquid level of water, and the humidifying device is provided with a spraying pipeline which can form a circulating spray. The circulating pump on the spraying pipeline can realize continuous spraying and humidifying of the gas passing through the humidifying device, which has the characteristics of significant humidifying effect and stable operation performance.

[0021] In addition, the adjusting valve and the flow detection device are arranged on the gas supply pipeline, so that the gas supply flow can be accurately controlled, thereby improving the humidification process control effect of the electric pile. The flow detection device is designed as two branches of the first measuring branch and the second measuring branch. The first flowmeter and the second flowmeter with different flow levels on the two branches are used to control the opening and closing of the first stop valve and the second stop valve respectively, so that the two flowmeters can be used separately and combined, thereby the flow range and the measurement accuracy of the gas supply flow detection. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which form a part of the present application, are used to provide a further understanding of the present application, and the schematic embodiments of the present application and their descriptions are used to explain the present application, wherein the front and back, up and down and other directional words involved are only used to indicate the relative positional relationship, and do not constitute an improper limitation on the present application. In the drawings:

[0023] Figure 1 The overall system structure schematic diagram of the electric pile humidification system is described in the embodiments of the present application.

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] 1, gas supply unit; 10, nitrogen gas source; 11, gas supply pipeline; 111, first measuring branch; 112, second measuring branch; BV1, first on-off valve; PV1, adjusting valve; PT1, first pressure sensor; PV2, first pneumatic shut-off valve; PTV, three-way valve; GV1, first stop valve; GV2, second stop valve; FG1, first flowmeter; FG2, second flowmeter; CV1, first check valve;

[0026] 2, humidifying unit; 20, spraying pipeline; 21, humidifying pipeline; 22, pressure relief pipeline; 200, water filter net; V1, humidifying device; P1, circulating pump; CV2, second check valve; PG1, first pressure gauge; HTR, heater; TT1, first temperature sensor; C1, vortex air pump; TT2, second temperature sensor; TT3, third temperature sensor; PT2, second pressure sensor; BV2, second on-off valve; LS1, low liquid level sensor; LS2, high liquid level sensor; SV1, safety valve; BV7, drain valve;

[0027] 3, tail exhaust unit; 30, exhaust pipeline; 31, tail gas pipeline; 32, first exhaust pipeline; 33, second exhaust pipeline; BV3, third switch valve; BV4, first exhaust valve; V2, gas-liquid separator; LS3, liquid level meter; PV3, second pneumatic shut-off valve; BV5, second exhaust valve;

[0028] 4, water supplement unit; 40, water source; 41, water supplement pipeline; BV6, fourth switch valve; P2, water supplement pump; PG2, second pressure gauge; CV3, third check valve; PV4, third pneumatic shut-off valve;

[0029] 5, electric pile; 6, circulation pipeline; 7, exhaust pipeline. DETAILED DESCRIPTION

[0030] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0031] In the description of the utility model, it should be declared that if the terms such as "up, down, left, right, front, back, inside and outside" indicating the orientation or positional relationship appear, it is based on the orientation or positional relationship shown in the drawing, and it is only for the convenience of describing the utility model, and it cannot be understood as the limitation of the utility model.

[0032] In addition, in the description of the utility model, unless otherwise explicitly limited, the terms "mounting", "connecting", "connection" and "connecting piece" should be understood broadly. For example, the connection can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood in combination with specific circumstances. In the description of the utility model, the limiting terms such as "first, second, A, B, C and D" appear, which are only for distinguishing the same features of different positions, attribution or use, to avoid ambiguity and confusion, and cannot be understood as indicating or implying relative importance.

[0033] The utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0034] Embodiment one

[0035] This embodiment relates to a kind of electric pile humidification system, can save the consumption of gas for electric pile 5 humidification;One exemplary system configuration is as shown in Figure 1 As shown in the figure.

[0036] Overall, the stack humidification system comprises a humidification unit 2, a tail exhaust unit 3, and a gas supply unit 1 for supplying gas to the humidification unit 2. The humidification unit 2 and the tail exhaust unit 3 are respectively connected to the gas inlet and the gas outlet of the stack 5, and a circulation pipeline 6 is connected between the tail exhaust unit 3 and the gas supply unit 1. The gas supplied by the gas supply unit 1 is humidified by the humidification unit 2 and then enters the stack 5, and the exhaust gas discharged from the stack 5 enters the tail exhaust unit 3, which can separate the water in the exhaust gas and deliver the water-separated gas to the gas supply unit 1 through the circulation pipeline 6.

[0037] It should be noted that based on the overall design idea described above, the technical scheme of the present application can adopt various different specific implementation structures, forms or configuration sequences. For example, the humidification unit 2 described above can adopt various different specific forms such as spray humidification, direct introduction of gas into water to make the water boil for humidification, etc. The specific arrangement sequence, assembly connection mode, etc. of the gas supply unit 1, the humidification unit 2, the tail exhaust unit 3, etc. can also be flexibly adjusted. For the parts required for the implementation of the overall scheme but not involved in the above overall arrangement, reasonable and flexible design can be made by referring to the mature setting means in the field, the actual situation during implementation, etc. The specific implementation scheme described below in this embodiment is only one of the relatively optimal schemes formed by various combinations and changes of the above, and in actual implementation, the skilled in the art can make flexible adjustments and improvements in combination with the actual situation. Obviously, the various specific form combinations and changes of the above can form many schemes, and the specific implementation scheme of this embodiment is within the protection scope of the present application.

[0038] Specifically, in this embodiment, the humidification unit 2 comprises a humidification device V1 and a humidification pipeline 21 connected between the humidification device V1 and the stack 5, and the humidification device V1 is provided with a spray pipeline 20. The gas supplied by the gas supply unit 1 to the humidification device V1 is humidified by the water sprayed by the spray pipeline 20 and then delivered to the stack 5 through the humidification pipeline 21. The spray method is used to humidify the gas passing through the humidification unit 2, which has the advantages of simple structure, easy processing and construction, and good humidification effect.

[0039] Based on the above arrangement, the humidification device V1 in this embodiment contains water, the spray pipeline 20 is led out from the bottom of the humidification device V1 and then introduced into the inner cavity of the humidification device V1 for spraying, and a circulating pump P1 is arranged on the spray pipeline 20. The humidification pipeline 21 is led out from the top of the humidification device V1. The humidification device V1 contains water at a certain liquid level, and the spray pipeline 20 is arranged to form a circulating spray for the humidification device V1. The circulating pump P1 on the spray pipeline 20 can realize continuous spray humidification of the gas passing through the humidification device V1, which has the characteristics of significant humidification effect and stable operation performance.

[0040] And, the humidifying unit 2 of the embodiment further comprises a heater HTR arranged on the spray pipeline 20, water flowing through the heater HTR in the spray pipeline 20 can be heated to a set temperature. A third temperature sensor TT3 can be arranged on the heater HTR for monitoring the heating temperature of the heater HTR. By arranging the heater HTR on the spray pipeline 20, the water can be heated, so that the spray water can be controlled at a suitable temperature condition, not only the humidification effect on the gas can be improved, but also the temperature of the humidified gas can be conveniently controlled to provide the required temperature and humidity of the humidified gas for the stack 5.

[0041] In addition, the stack humidification system of the embodiment further comprises a water replenishing unit 4 for replenishing water into the humidifying device V1, and the humidifying device V1 is provided with a liquid level detection device. In the case that the humidifying unit 2 realizes the circulating spray through the spray pipeline 20, the humidifying water in the humidifying device V1 is gradually consumed. By arranging the water replenishing unit 4 and the liquid level detection device for the humidifying device V1, the humidifying device V1 can be replenished with water in time according to the change of the liquid level in the humidifying device V1, so that the continuous and stable operation of the humidifying unit 2 can be ensured.

[0042] Specifically, the water replenishing unit 4 of the embodiment comprises a water replenishing pipeline 41 communicated between a water source 40 and the humidifying device V1, and a water replenishing pump P2 and a third check valve CV3 arranged on the water replenishing pipeline 41, and the water replenishing pipeline 41 is provided with a fourth switch valve BV6, a second pressure gauge PG2 and a third pneumatic shut-off valve PV4, wherein the fourth switch valve BV6 is arranged between the water source 40 and the water replenishing pump P2 and can be manually closed, the second pressure gauge PG2 and the third pneumatic shut-off valve PV4 are arranged on the downstream side of the water replenishing pump P2 for detecting the water supply pressure of the water replenishing and controlling the opening and closing of the pipeline. The liquid level detection device comprises a low liquid level sensor LS1 and a high liquid level sensor LS2 for detecting the highest liquid level and the lowest liquid level of the humidifying device V1 respectively, so that the water replenishing time of the water replenishing unit 4 can be simply and conveniently controlled.

[0043] In addition, the inner cavity of the humidifying device V1 of the embodiment is provided with a water filtering net 200 at the top, and the water filtering net 200 is located between the spray pipeline 20 and the humidifying pipeline 21 to block the water droplets sprayed out of the spray pipeline 20 from entering the humidifying pipeline 21. By arranging the water filtering net 200 between the spray pipeline 20 and the humidifying pipeline 21, the water droplets sprayed out can be effectively prevented from directly entering the humidifying pipeline 21 under the guidance of the airflow, and then the water vapor can be prevented from directly entering the stack 5, so that the controllability of the humidification process of the stack 5 can be ensured.

[0044] Additionally, a safety valve SV1 can be installed on the humidifier V1. Specifically, the top of the humidifier V1 is connected to a pressure relief pipe 22, and the safety valve SV1 is installed on the pressure relief pipe 22. When the pressure of the humidifier V1 exceeds the safety threshold, the safety valve SV1 will automatically open to discharge the gas inside the humidifier V1.

[0045] In this embodiment, the humidification pipeline 21 is equipped with a vortex air pump stack humidification system and a temperature and humidity detection device. Specifically, the temperature and humidity detection device includes a second pressure sensor PT2, a first temperature sensor TT1, and a second temperature sensor TT2, enabling on-site pressure observation and the detection and remote transmission of temperature and humidity signals. In a more detailed configuration, a second switching valve BV2 can also be installed on the humidification pipeline 21, a first pressure gauge PG1 and a second one-way valve CV2 can be installed on the spray pipeline 20, and a drain valve BV7 can be installed at the bottom of the humidification device V1 to flexibly achieve pipeline on / off control, one-way flow control, and drainage functions.

[0046] The safety valve SV1 on the humidification unit V1 prevents overpressure within the unit, ensuring equipment safety. A temperature and humidity detection device is installed on the humidification pipeline 21 to monitor the temperature and humidity parameters of the humidifying gas entering the fuel cell stack 5 in real time. This allows for timely adjustments to the spray intensity of the upstream spray pipeline 20 and the heating intensity of the heater HTR, thus precisely controlling the temperature and humidity of the humidifying gas. A vortex pump fuel cell stack humidification system is installed on the humidification pipeline 21 to effectively increase the pressure of the humidifying gas supplied to the fuel cell stack 5, providing high-flow, high-pressure humidifying gas and improving the humidification process efficiency of the fuel cell stack 5.

[0047] Still Figure 1 As shown, the tail gas discharge unit 3 in this embodiment includes a gas-liquid separator V2 connected to the exhaust port of the fuel cell stack 5, and a level gauge LS3 for detecting the liquid level inside the gas-liquid separator V2. The bottom of the gas-liquid separator V2 is connected to an external discharge pipe 30 with controllable on / off functionality. A second pneumatic shut-off valve PV3 is installed on the external discharge pipe 30 to control its opening and closing. The gas-liquid separator V2 in the tail gas discharge unit 3 can separate the water and liquid in the exhaust gas discharged from the fuel cell stack 5, and simultaneously separate impurities and foreign matter from the exhaust gas, thereby returning the clean humidified gas to the gas supply unit 1 for reuse, effectively reducing gas consumption. The level gauge LS3 can monitor the liquid level inside the gas-liquid separator V2 in real time, thereby controlling the opening and closing of the external discharge pipe 30 to promptly discharge the separated waste liquid, thus ensuring the continuous and stable operation of the gas-liquid separator V2.

[0048] In addition, a controllable emptying pipeline can be arranged at the top of the gas-liquid separator V2. Specifically, the tail gas pipeline 31 is communicated between the exhaust port of the stack 5 and the gas-liquid separator V2, the third on-off valve BV3 is arranged on the tail gas pipeline 31, the second emptying pipeline 33 is arranged on the tail gas pipeline 31 between the third on-off valve BV3 and the stack 5, and the first emptying valve BV4 is arranged on the second emptying pipeline 33. In addition, the first emptying pipeline 32 is communicated at the top of the gas-liquid separator V2, the second emptying valve BV5 is arranged on the first emptying pipeline 32; the second emptying pipeline 33 and the first emptying pipeline 32 are communicated with the emptying pipeline 7 of the system.

[0049] For the specific arrangement of the gas supply unit 1, of course, there are many different structural schemes to choose from. In the present embodiment, as shown in Figure 1 the gas supply unit 1 includes a gas supply pipeline 11 communicated between the nitrogen gas source 10 and the humidification unit 2, and an adjusting valve PV1 and a flow detection device arranged on the gas supply pipeline 11. Specifically, the first on-off valve BV1, the adjusting valve PV1, the first pressure sensor PT1, the first pneumatic shut-off valve PV2, the flow detection device and the first check valve CV1 are arranged in sequence on the gas supply pipeline 11; the upstream gas supply pipeline 11 of the flow detection device is communicated with the circulation pipeline 6 through a three-way valve PTV, so as to realize flexible communication switching between the connected pipelines. The adjusting valve PV1 and the flow detection device arranged on the gas supply pipeline 11 can accurately control the gas supply flow, thereby improving the humidification process control effect of the stack 5.

[0050] Preferably, the flow detection device of the present embodiment includes a first measurement branch 111 and a second measurement branch 112 arranged in parallel, the first measurement branch 111 is provided with a first shut-off valve GV1 and a first flow meter FG1, the second measurement branch 112 is provided with a second shut-off valve GV2 and a second flow meter FG2, and the range of the first flow meter FG1 is greater than that of the second flow meter FG2. The flow detection device is designed as two branches of the first measurement branch 111 and the second measurement branch 112, the first flow meter FG1 and the second flow meter FG2 with different flow levels are arranged on the two branches, and the separate and combined use of the two flow meters can be realized by controlling the on-off of the first shut-off valve GV1 and the second shut-off valve GV2, thereby realizing the flow range and measurement accuracy of the gas supply flow detection.

[0051] In addition, it should be pointed out that the nitrogen source 10 can be a part of the stack humidification system, or can be a separate setting of the stack humidification system; when the nitrogen source 10 is set up, the nitrogen source 10 is connected to the stack humidification system according to the needs. Nitrogen has high stability, is not easy to burn and explode, and has relatively low cost; and the circulation of nitrogen is realized through the tail exhaust unit 3 and the circulation pipeline 6, further reducing the operation cost of the system. The water source 40 is preferably deionized water to improve the cleanliness and electrical stability of the water supply and ensure the reliability of the stack 5 humidification.

[0052] In summary, the stack humidification system of the embodiment, by setting the humidification unit 2 and the tail exhaust unit 3 at the inlet and outlet of the stack 5, the gas supplied by the gas supply unit 1 for humidification can be humidified to the appropriate humidity by the humidification unit 2 and then supplied to the stack 5, and the stack core is humidified and treated, and the exhaust gas discharged from the stack 5 contains a large amount of water, impurities and the like, which can be separated by the tail exhaust unit 3. The gas for humidification can be obtained again and circulated to the gas supply unit 1 for humidification, which is beneficial to save the consumption of gas for humidification of the stack 5. Moreover, the stack humidification system of the utility model is specially used for humidification of the stack 5, which can effectively shorten the humidification time and make the core reach the set impedance value faster.

[0053] The above is only a preferred embodiment of the utility model, and the detailed configuration explanation, specific structure setting form example, or assembly connection mode expression, etc. are all for the need of full disclosure, so that the skilled in the art can better implement the utility model, and not to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A fuel cell humidification system, characterized in that: it comprises a humidification unit (2), a tail exhaust unit (3), and a gas supply unit (1) for supplying gas to the humidification unit (2); the humidification unit (2) and the tail exhaust unit (3) are respectively connected to the gas inlet and outlet of a fuel cell (5), and a circulation pipeline (6) is connected between the tail exhaust unit (3) and the gas supply unit (1); the gas supplied by the gas supply unit (1) is humidified by the humidification unit (2) and then enters the fuel cell (5), the tail gas discharged by the fuel cell (5) enters the tail exhaust unit (3), and the tail exhaust unit (3) can separate the water in the tail gas and deliver the gas from which the water is separated to the gas supply unit (1) through the circulation pipeline (6).

2. The fuel cell humidification system according to claim 1, characterized in that: the humidification unit (2) comprises a humidification device (V1) and a humidification pipeline (21) connected between the humidification device (V1) and the fuel cell (5), and the humidification device (V1) is provided with a spraying pipeline (20); the gas supply unit (1) is connected to the humidification device (V1), and the gas supplied by the gas supply unit (1) to the humidification device (V1) is humidified by the water sprayed by the spraying pipeline (20) and then delivered to the fuel cell (5) through the humidification pipeline (21).

3. The fuel cell humidification system according to claim 2, characterized in that: the spraying pipeline (20) is led out from the bottom of the humidification device (V1) and then introduced into the inner cavity of the humidification device (V1) for spraying, and a circulation pump (P1) is arranged on the spraying pipeline (20); the humidification pipeline (21) is led out from the top of the humidification device (V1).

4. The fuel cell humidification system according to claim 3, characterized in that: the humidification unit (2) further comprises a heater (HTR) arranged on the spraying pipeline (20), and the water flowing through the heater (HTR) in the spraying pipeline (20) can be heated to a set temperature.

5. The fuel cell humidification system according to claim 3, characterized in that: it further comprises a water replenishment unit (4) for replenishing water in the humidification device (V1), and a liquid level detection device is arranged on the humidification device (V1).

6. The fuel cell humidification system according to claim 3, characterized in that: a water filtering net (200) is arranged at the top of the inner cavity of the humidification device (V1), and the water filtering net (200) is located between the spraying pipeline (20) and the humidification pipeline (21) to prevent the water droplets sprayed by the spraying pipeline (20) from entering the humidification pipeline (21).

7. The fuel cell humidification system according to claim 2, characterized in that: a safety valve (SV1) is arranged on the humidification device (V1), and / or a vortex air pump (C1) and a temperature and humidity detection device are arranged on the humidification pipeline (21).

8. The fuel cell humidification system according to claim 1, characterized in that: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The tail discharge unit (3) comprises a gas-liquid separator (V2) communicated with the exhaust port of the stack (5), and a liquid level meter (LS3) for detecting the liquid level in the gas-liquid separator (V2); The bottom of the gas-liquid separator (V2) is communicated with an on-off controllable external discharge pipeline (30).

9. The stack humidification system according to any one of claims 1 to 8, characterized in that: The gas supply unit (1) comprises a gas supply pipeline (11) communicated between a nitrogen gas source (10) and the humidification unit (2), and an adjusting valve (PV1) and a flow detection device arranged on the gas supply pipeline (11).

10. The stack humidification system according to claim 9, characterized in that: The flow detection device comprises a first measurement branch (111) and a second measurement branch (112) arranged in parallel; A first shut-off valve (GV1) and a first flow meter (FG1) are arranged on the first measurement branch (111), and a second shut-off valve (GV2) and a second flow meter (FG2) are arranged on the second measurement branch (112), and the range of the first flow meter (FG1) is greater than that of the second flow meter (FG2).

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