Device for detecting concentration of hydrogen in oxygen

Abstract

The utility model provides a device for detecting the concentration of hydrogen in oxygen, which relates to the technical field of hydrogen production and comprises a sampling gas pretreatment unit, a detection unit and an injection unit. The sampling gas pretreatment unit comprises a heat exchange plate exchanger, a condensation pipe and a dryer which are connected in sequence; the detection unit comprises a flow meter and a hydrogen concentration detection sensor which are connected in sequence; the injection unit comprises an ejector, the first gas inlet end of the ejector is connected with the gas outlet end of the hydrogen concentration detection sensor, the second gas inlet end of the ejector is connected with a compressed gas supply pipeline, and the gas outlet end of the ejector is connected with a gas exhaust pipeline. The influence of moisture on the hydrogen concentration detection sensor is effectively reduced through multi-stage gas pretreatment, the problem that the gas flow of a detection loop is insufficient is solved through introduction of the ejector, and the detection precision of the hydrogen concentration in oxygen in a PEM electrolytic bath system is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydrogen production technical field, concretely relates to a hydrogen concentration detection device in oxygen. BACKGROUND

[0002] Proton exchange membrane (PEM) electrolyzer is a kind of water electrolysis hydrogen production technology using proton exchange membrane as electrolyte.Compared with traditional alkaline electrolyzer, PEM electrolyzer uses proton exchange membrane to replace diaphragm and liquid electrolyte, and has good application prospect.In the working process of PEM electrolyzer, water molecules occur oxidation reaction to generate oxygen and proton on anode side, proton is conducted to cathode through proton exchange membrane and occurs reduction reaction to generate hydrogen, and oxygen generated by anode and hydrogen generated by cathode are collected and transported through bipolar plate respectively.

[0003] However, in practical application, a small amount of hydrogen gas penetrates to anode side, and is returned to pure water tank with oxygen and unreacted water, so that hydrogen-oxygen mixed gas exists in pure water tank.Because hydrogen gas has explosion risk when mixed with air in certain concentration range, therefore, accurately detecting hydrogen concentration in oxygen is crucial for safe operation of PEM electrolyzer.

[0004] At present, there are still some technical problems in detecting hydrogen concentration in oxygen in PEM electrolyzer: first, water in sampling gas can affect detection accuracy of hydrogen concentration detection sensor, and even can damage sensor;Second, insufficient gas flow in detection circuit also can affect accuracy of detection result.These problems seriously restrict reliability of PEM electrolyzer safety monitoring system. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of hydrogen concentration detection device in oxygen based on "gas pretreatment-detection-ejection" three-stage structure, and the detection accuracy and reliability of hydrogen concentration in oxygen in PEM electrolyzer system are improved by multistage gas processing and flow control.

[0006] To achieve the above-mentioned purpose, the utility model realizes by following technical scheme:

[0007] A kind of hydrogen concentration detection device in oxygen, comprising:

[0008] Sampling gas pretreatment unit, the sampling gas pretreatment unit includes heat exchanger, condenser and drier connected in sequence;

[0009] Detection unit, the detection unit includes flow meter and hydrogen concentration detection sensor connected in sequence;

[0010] An ejector unit, which comprises an ejector, a first gas inlet end of the ejector is connected with a gas outlet end of the hydrogen concentration detection sensor, a second gas inlet end of the ejector is connected with a compressed gas supply pipeline, and a gas outlet end of the ejector is connected with a gas discharge pipeline.

[0011] A gas outlet end of the dryer is connected with a gas inlet end of the flow meter.

[0012] Further, the sampling gas pretreatment unit further comprises a filter arranged between the condenser pipe and the dryer.

[0013] Further, a calibration gas passage is further included, which is connected with the gas outlet end of the dryer through a three-way valve.

[0014] Further, a pressure regulating device is arranged on the compressed gas supply pipeline.

[0015] Further, the pressure regulating device comprises an electromagnetic valve and a pressure regulating valve connected in sequence.

[0016] Further, the heat exchanger has a cooling water inlet and a cooling water outlet, which are connected with an external cooling water circulation system.

[0017] Further, a condensate water discharge outlet is arranged on the condenser pipe.

[0018] Further, a flame arrester is connected with an outlet end of the gas discharge pipeline.

[0019] Further, the heat exchanger is a plate heat exchanger.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] Firstly, the device is provided with a gas pretreatment unit, adopts a multi-stage processing structure of "heat exchange plate - condenser pipe - dryer", and can effectively reduce the water content in the sampling gas.

[0022] Secondly, an ejector unit is arranged at the rear end of the detection unit, the ejector is driven to work by using compressed gas, and the gas flow of the whole detection circuit can be effectively improved.

[0023] III. The gas pretreatment unit and the injection unit jointly improve the detection accuracy of the hydrogen concentration in the oxygen in the PEM electrolyzer system, and provide a reliable guarantee for the safe operation of the system. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structural schematic view of the device;

[0025] In the figure:

[0026] 1, heat exchange plate; 2, cooling water inlet; 3, cooling water outlet; 4, sampling gas inlet; 5, flow meter; 6, hydrogen concentration detection sensor; 7, gas discharge pipeline; 8, ejector; 9, compressed gas inlet; 10, pressure regulating device; 11, dryer; 12, filter; 13, condensate discharge outlet; 14, condenser tube; 15, three-way valve; 16, calibration gas passage; 17, flame arrestor. DETAILED DESCRIPTION

[0027] The technical scheme of the present application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] The hydrogen concentration detection device provided by the present application comprises a sampling gas pretreatment unit, a detection unit and an injection unit. The sampling gas pretreatment unit comprises a heat exchange plate 1, a condenser tube 14 and a dryer 11 connected in sequence, and is used for pretreating the sampling gas; the detection unit comprises a flow meter 5 and a hydrogen concentration detection sensor 6 connected in sequence, and is used for detecting the hydrogen concentration in the gas; the injection unit comprises an ejector 8, a first gas inlet end of which is connected with a gas outlet end of the hydrogen concentration detection sensor 6, a second gas inlet end of which is connected with a compressed gas supply pipeline, and a gas outlet end of which is connected with a gas discharge pipeline 7. The gas outlet end of the dryer 11 is connected with the gas inlet end of the flow meter 5, forming a complete detection loop.

[0030] Specifically, the heat exchange plate exchanger 1 has a cooling water inlet 2 and a cooling water outlet 3, which are connected with an external cooling water circulation system for providing cooling water for the heat exchange plate exchanger 1. The condensing pipe 14 is provided with a condensed water discharge outlet 13 for discharging condensed water. In order to improve the safety of the system, a flame arrester 17 is connected to the outlet end of the gas discharge pipeline 7.

[0031] In the embodiment, the sampling gas pre-treatment unit further comprises a filter 12 arranged between the condensing pipe 14 and the dryer 11, for filtering impurities in the gas.

[0032] In another embodiment, the compressed gas supply pipeline comprises a compressed gas inlet 9 and a pressure regulating device 10, which comprises an electromagnetic valve and a pressure regulating valve connected in sequence, for regulating the pressure of the compressed gas driving the ejector 8.

[0033] In another embodiment, in order to facilitate periodic calibration of the system, a calibration gas passage 16 is further arranged at the gas outlet end of the dryer 11, which is connected with the gas outlet end of the dryer 11 through a three-way valve 15, and the gas inlet end of the flow meter 5 is also connected with the gas outlet end of the dryer 11 through the three-way valve 15.

[0034] In actual application, the sampling gas inlet 4 is connected to the heat exchange plate exchanger 1, and the sampling gas first enters the heat exchange plate exchanger 1, and the temperature of the gas is reduced through heat exchange with the cooling water, so that the water in the gas is preliminarily condensed. The condensed water is intercepted in the condensing pipe 14 and discharged through the condensed water discharge outlet 13, and the gas is filtered through the filter 12 and then enters the dryer 11 for secondary drying treatment. The dried gas is adjusted in flow by the flow meter 5 and then enters the hydrogen concentration detection sensor 6 for detection. The detected gas is mixed with the compressed gas under the action of the ejector 8 and then discharged to the atmosphere through the flame arrester 17. Among them, the compressed gas is adjusted by the pressure regulating device 10 to drive the ejector 8 to work, and drive the gas flow in the whole detection circuit.

[0035] When the system needs to be calibrated, the gas path can be switched through the three-way valve 15, so that the calibration gas enters the detection unit to realize the calibration of the system. This design enables the system to be calibrated periodically, ensuring the accuracy of the detection results.

[0036] The hydrogen concentration detection device for oxygen can be applied to a PEM electrolytic cell system, and is used for monitoring the hydrogen concentration in oxygen in the running process of the system. Through the cooperation of the multi-stage gas pre-treatment and the ejector unit, the device can effectively improve the accuracy and reliability of the detection, and provide protection for the safe operation of the PEM electrolytic cell.

[0037] The above-mentioned embodiments only illustrate the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent transformation or modification according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A device for detecting hydrogen concentration in oxygen, characterized in that, The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device.

2. The apparatus according to claim 1, wherein The application relates to a hydrogen concentration detection device.

3. The apparatus according to claim 1, wherein The application relates to a hydrogen concentration detection device.

4. The apparatus according to claim 1, wherein The application relates to a hydrogen concentration detection device.

5. The apparatus according to claim 4, wherein The application relates to a hydrogen concentration detection device.

6. The apparatus according to claim 1, wherein The application relates to a hydrogen concentration detection device.

7. The apparatus according to claim 1, wherein The application relates to a hydrogen concentration detection device.

8. The apparatus according to claim 1, wherein The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device. The application relates to a hydrogen concentration detection device.

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