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A hydrogen concentration sensor based on the electrochemical principle of catalytic reaction

A concentration sensor and catalytic reaction technology, applied in the direction of material electrochemical variables, etc., can solve the problems of low measurement accuracy, inability to continuously monitor hydrogen on-line, and no devices, etc., and achieve the effects of strong selectivity, fast response time, and small measurement error

Active Publication Date: 2018-06-15
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the hydrogen concentration sensors at home and abroad are generally implemented based on the working principle of the thermal conductivity method. These sensors are mainly suitable for sample measurement, and the measurement accuracy is low when measuring high-temperature, complex-component gases, and cannot realize online continuous monitoring of hydrogen in the environment.
Obviously, the existing hydrogen concentration sensor is not suitable for the containment hydrogen control system of AP1000 and CAP1400 third-generation nuclear power plants. Designing a sensor that can realize online continuous monitoring of hydrogen in the environment has become a widespread concern at present. Problem, however, there is no corresponding device and no related reports

Method used

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  • A hydrogen concentration sensor based on the electrochemical principle of catalytic reaction

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Embodiment 1

[0024] Such as figure 1 As shown, a hydrogen concentration sensor based on the electrochemical principle of catalytic reaction, including a pressure balance membrane 3, an inner shell 4, a counter electrode 5, a working electrode 8, a concentrated sulfuric acid electrolyte 9, a hydrogen semipermeable membrane 10 and a signal connector 12 , wherein the material of the inner shell 4 is polytetrafluoroethylene, the upper and lower ends of the inner shell 4 are open, the pressure balance membrane 3 is fixed on both ends of the inner shell 4 and closes the upper end of the inner shell 4 Opening, the hydrogen semi-permeable membrane 10 is fixed on the lower two ends of the inner shell 4 and closes the opening at the lower end of the inner shell 4 . In this embodiment, the area between the pressure balance membrane 3 , the inner casing 4 and the hydrogen semipermeable membrane 10 constitutes an electrolyte cavity, and the concentrated sulfuric acid electrolyte 9 is filled in the elec...

Embodiment 2

[0028] The present embodiment makes the following further limitations on the basis of Embodiment 1: the present embodiment also includes a temperature measuring element 7, wherein the temperature measuring element 7 passes through the inner shell 4 and its temperature sensing end is connected to the concentrated sulfuric acid electrolyte 9 touch.

Embodiment 3

[0030]This embodiment makes the following further limitations on the basis of embodiment 1 or embodiment 2: this embodiment also includes an upper sealing cover plate 2 and a lower sealing cover plate 11, and both the upper sealing cover plate 2 and the lower sealing cover plate 11 are It is circular. The inner shell 4 of this embodiment is cylindrical, and the upper and lower ends of the inner shell 4 protrude outward to form a ring-shaped positioning platform. The upper end surface contacts and is pressed down by the upper sealing cover plate 2, and the circumferential edge of the hydrogen semipermeable membrane 10 is in contact with the lower end surface of the lower positioning platform of the inner shell 4 and is pressed and fixed by the lower sealing cover plate 11. In this embodiment, when the pressure balance membrane 3 and the hydrogen semi-permeable membrane 10 are fixed, the two are first laid flat and the circumferential edges of the two are in contact with the pos...

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Abstract

The invention discloses a hydrogen concentration sensor based on the electrochemical principle of catalytic reaction, which comprises a pressure balance membrane, an inner shell, a counter electrode, a working electrode, a concentrated sulfuric acid electrolyte, a hydrogen semipermeable membrane and a signal joint, and the inner shell is up and down. Both ends are open, and the pressure balance membrane and the hydrogen semipermeable membrane respectively seal the openings at the upper and lower ends of the inner shell. The area between the pressure balance membrane, the inner shell and the hydrogen semipermeable membrane constitutes the electrolyte cavity. Electrolyte is filled in the electrolyte cavity. One end of the counter electrode, the working electrode and the signal joint is embedded in the electrolyte cavity, and the counter electrode and the signal joint are connected to the working electrode. The substrate surface of the counter electrode is coated with a platinum dioxide layer, and the substrate surface of the working electrode is coated with a platinum black layer. When the invention is applied, the measurement accuracy is high, the selectivity is strong, and it has the ability to work continuously and stably under severe conditions such as 220°C, irradiation, and high-concentration water vapor.

Description

technical field [0001] The invention relates to the technical field of hydrogen concentration measurement, in particular to a hydrogen concentration sensor based on the electrochemical principle of catalytic reaction. Background technique [0002] After the Fukushima nuclear power plant accident in Japan, the National Nuclear Safety Administration required that an online monitoring system for hydrogen concentration under severe accident conditions be added to the hydrogen control system for continuous online monitoring of hydrogen concentration under severe accidents. At present, the hydrogen concentration in nuclear power plants mainly adopts off-line monitoring technology. The containment hydrogen control system of the AP1000 and CAP1400 third-generation nuclear power plants requires the online monitoring of the hydrogen concentration value as the condition for controlling the start of the hydrogen igniter, which requires the realization of the online real-time monitoring ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/26
Inventor 王宏庆马韦刚姜峨唐月明唐敏郑华
Owner NUCLEAR POWER INSTITUTE OF CHINA
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