Oxygen chemical sensor for high-temperature and high-pressure hydrothermal system and preparation method of oxygen chemical sensor

Abstract

The invention discloses an oxygen chemical sensor for a high-temperature and high-pressure hydrothermal system and a preparation method of the oxygen chemical sensor. The oxygen chemical sensor comprises a base, circular platform-shaped high-temperature-resistant insulating conical pads, a solid oxygen buffer agent, high-temperature-resistant insulating conical sleeves, circular platform-shaped solid electrolyte ceramic, circular platform-shaped high-temperature-resistant insulating ceramic, spongy inert metal layers, inert metal sheets and electrode leads. The oxygen chemical sensor, namely an oxygen sensor based on an electrochemical cell, is formed by combining all the components into a conical self-tightening mechanism, and can be utilized for in-situ direct measurement of the oxygen fugacity or the oxygen activity in the high-temperature (250 to 700 DEG C) and high-pressure (normal pressure to 100 MPa) hydrothermal system, so as to solve the problems that various conventional oxygen chemical sensors for a high-pressure hydrothermal system are low in operating temperature and operating pressure (the operating temperature and the operating pressure can hardly exceed 400 DEG C and 40 MPa simultaneously), low in response speed, and low in reliability when being applied to a complex concentrated water fluid sample.

Description

technical field [0001] The invention relates to a chemical sensor for in-situ detection of oxygen fugacity or oxygen activity in a high-temperature and high-pressure hydrothermal system and a preparation method thereof. Background technique [0002] The oxygen fugacity or activity of a high temperature and high pressure hydrothermal system is an ensemble description of the temperature, pressure and chemical composition of the system. For high-temperature and high-pressure hydrothermal systems containing variable valence elements, oxygen fugacity or activity is one of the most important physical and chemical variables in the system. all play an extremely important role. Therefore, field detection, scientific experiments and industrial processes involving high-temperature and high-pressure hydrothermal systems such as thermal power generation, boilers, nuclear reactors, hydrothermal material synthesis, waste treatment of supercritical water, petrochemical industry, etc. , it...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method based on the principle of YSZ electrochemical cell, which can directly and reliably measure the oxygen fugacity of a hydrothermal system in a wide temperature and pressure range (250-700°C, normal pressure-100 MPa) in situ. A chemical sensor for oxygen or oxygen activity and a preparation method thereof, to solve the problems of low working temperature and pressure, slow response speed and reliability in various existing chemical sensors used for in-situ measurement of oxygen fugacity or oxygen activity in high-temperature and high-pressure hydrothermal systems questions of sexuality

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