CN217466776U

CN217466776U - Hydrogen detection device

Info

Publication number: CN217466776U
Application number: CN202220017704.XU
Authority: CN
Inventors: 方沛军; 邹建新; 陈斌; 张雷; 伍远安; 曹俊
Original assignee: Hydrogen Storage Shanghai Energy Technology Co ltd; Shanghai Hyfun Energy Technology Co Ltd
Current assignee: Hydrogen Storage Shanghai Energy Technology Co ltd; Shanghai Hyfun Energy Technology Co Ltd
Priority date: 2022-01-05
Filing date: 2022-01-05
Publication date: 2022-09-20
Anticipated expiration: 2032-01-05

Abstract

The utility model discloses a hydrogen detection device, the device includes: the device comprises a reference bridge consisting of a magnesium alloy catalyst material, a measuring bridge consisting of a magnesium alloy catalyst material, a standard resistor RA, a standard resistor RB, a power supply and a circuit for measuring the resistance change of the bridge; the reference bridge, the measuring bridge, the standard resistor RA and the standard resistor RB form a Wheatstone bridge structure, the power supply supplies power to the Wheatstone bridge, and the resistance value of the reference bridge and the measuring bridge in the Wheatstone bridge is measured by the circuit for measuring the resistance change of the bridge. The utility model has the advantages that: the hydrogen gas is only reacted, and the hydrogen gas can not react with other combustible gases, so that the gas measuring tool is pointed; as long as the voltage applied by the measuring bridge is increased to enable the measuring bridge to reach about 370 ℃, the magnesium hydride catalyst can be reduced into magnesium alloy, no consumption is caused, the catalyst of a detection device does not need to be replaced, and the reusability is realized.

Description

Hydrogen detection device

Technical Field

The utility model discloses hydrogen leak testing field especially relates to a hydrogen detection device.

Background

Hydrogen energy is a clean and pollution-free new energy source. The market for hydrogen detection has many detection devices, but most of the principles are catalytic and infrared optical. The catalytic type is to measure the combustible gas concentration by using the resistance change of a refractory metal platinum wire after heating. When combustible gas enters the detector, oxidation reaction (flameless combustion) is caused on the surface of the platinum wire, the generated heat raises the temperature of the platinum wire, the resistivity of the platinum wire changes, but the defect is that the catalyst is easy to lose, the catalyst needs to be replaced every year, different combustible gases are not identified, and an alarm is generated after flameless combustion. The infrared optical type is to detect the hydrocarbon combustible gas in the field environment by using an infrared sensor through the absorption principle of an infrared light source, and has the biggest defects of high manufacturing cost, weak interference resistance and obvious influence of external light on the measured data. The magnesium-based hydrogen storage material is a solid hydrogen storage material with great development prospect, and has the advantages of high hydrogen storage amount (7.6 wt.%), wide source, no toxicity, no harm, low cost and good safety. The principle of magnesium alloy hydrogen storage is as follows: under the conditions of certain temperature and hydrogen pressure, the magnesium alloy material can perform reversible hydrogen absorption-dehydrogenation reaction with hydrogen, thereby realizing the storage and release of the hydrogen. The magnesium alloy material only reacts with hydrogen and does not react with other gases such as carbon monoxide and hydrogen sulfide gas, and a device which is based on the magnesium-based alloy catalyst material and can be used for hydrogen detection is designed by utilizing the characteristics of reversible reaction and hydrogen reaction.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems of expensive cost and low reuse rate of the existing detection device for hydrogen detection: the utility model provides a hydrogen detection device, the device are based on magnesium base alloy catalyst material, can be used to hydrogen and listen.

The technical scheme of the utility model a hydrogen detection device is provided, the device includes:

the device comprises a reference bridge consisting of a magnesium alloy catalyst material, a measuring bridge consisting of a magnesium alloy catalyst material, a standard resistor RA, a standard resistor RB, a power supply and a circuit for measuring the resistance change of the bridge;

the reference bridge, the measuring bridge, the standard resistor RA and the standard resistor RB form a Wheatstone bridge structure, the power supply supplies power to the Wheatstone bridge, and the resistance value of the reference bridge and the measuring bridge in the Wheatstone bridge is measured by the circuit for measuring the resistance change of the bridge.

Compared with the prior art, the beneficial effects of the utility model include: the hydrogen gas is only reacted, and the hydrogen gas can not react with other combustible gases, so that the gas measuring tool is pointed; as long as the voltage applied by the measuring bridge is increased to enable the measuring bridge to reach about 370 ℃, the magnesium hydride catalyst can be reduced into magnesium alloy, no consumption is caused, the catalyst of a detection device does not need to be replaced, and the reusability is realized.

Drawings

Fig. 1 is a schematic structural diagram of a hydrogen detection device provided by the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The utility model provides a hydrogen detection device. Referring to fig. 1, fig. 1 is a structural diagram of the device of the present invention; the device comprises:

a reference bridge 1 composed of a magnesium alloy catalyst material, a measuring bridge 2 composed of a magnesium alloy catalyst material, a standard resistance RA 3 (generally 2k omega), a standard resistance RB 4 (generally 2k omega), a power supply 5 (generally 2.8V) and a circuit 6 (only by utilizing the existing circuit) for measuring the resistance change of the bridge;

the reference bridge 1, the measuring bridge 2, the standard resistor RA 3 and the standard resistor RB 4 form a Wheatstone bridge structure, the power supply 5 supplies power to the Wheatstone bridge, and the circuit 6 for measuring the resistance change of the bridge measures the resistance values of the reference bridge 1 and the measuring bridge 2 in the Wheatstone bridge.

The principle of the device is as follows:

the resistance of the conventional magnesium alloy is about 0.7 omega, and the resistance of the magnesium hydride absorbing hydrogen is more than 500M omega, and by utilizing the characteristic, the device uses the magnesium alloy catalyst material to replace the catalytic substances coated on the measuring bridge and the reference bridge.

In the actual process, the reference bridge 1 and the measurement bridge 2 are in the same environment; the same environment means that: the environmental temperature, humidity, pressure and the like are completely the same; but the reference bridge 1 is isolated by a box or a wall and is not contacted with hydrogen gas; a measuring bridge 2 capable of being contacted with hydrogen;

during measurement, the circuit 6 for measuring the resistance change of the bridge is utilized to apply voltage to the reference bridge 1 and the measurement bridge 2 to heat the two bridges, the voltage control device keeps the heat at about 250 ℃, under normal conditions, the catalyst can not absorb hydrogen, the bridge is balanced, the voltage V1 of the reference bridge 1 is equal to the voltage V2 of the measurement bridge 2, the output is 0, when hydrogen exists, the magnesium alloy catalyst can absorb hydrogen to form magnesium hydride, the magnesium alloy of the reference bridge is not in contact with the hydrogen at the moment, the circuit can measure the resistance change between the magnesium alloy and the magnesium hydride, the measurement bridge V2 is greater than the reference bridge V1, the output voltage is in direct proportion to the concentration of the hydrogen to be measured, and then the hydrogen detection can be completed.

It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The utility model has the advantages that: the hydrogen gas is only reacted, and the hydrogen gas can not react with other combustible gases, so that the gas measuring tool is pointed; as long as the voltage applied by the measuring bridge is increased to enable the measuring bridge to reach about 370 ℃, the magnesium hydride catalyst can be reduced into magnesium alloy, no consumption is caused, the catalyst of a detection device does not need to be replaced, and the reusability is realized.

The above description of the present invention does not limit the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A hydrogen gas detection device, characterized in that: the method comprises the following steps:

the device comprises a reference bridge (1) composed of a magnesium alloy catalyst material, a measuring bridge (2) composed of a magnesium alloy catalyst material, a standard resistor RA (3), a standard resistor RB (4), a power supply (5) and a circuit (6) for measuring the resistance change of the bridge;

the resistance value of the reference bridge (1) and the resistance value of the measuring bridge (2) in the Wheatstone bridge are measured by a circuit (6) which is used for supplying power to the Wheatstone bridge by a power supply (5) and measuring the resistance change of the Wheatstone bridge and is formed by the reference bridge (1), the measuring bridge (2), the standard resistor RA (3) and the standard resistor RB (4).