Oxygen chemical sensor for high temperature and high pressure hydrothermal system and preparation method thereof

Abstract

The invention discloses an oxygen chemical sensor for high-temperature and high-pressure hydrothermal systems and a preparation method thereof. The sensor consists of a base, a conical high-temperature-resistant insulating cone pad, a solid oxygen buffer, a high-temperature-resistant insulating cone sleeve, and a conical-shaped solid electrolyte ceramic. , circular frustum-shaped high-temperature-resistant insulating ceramics, sponge-shaped inert metal layer, inert metal sheet and electrode leads. The combination of each part forms a conical self-tightening sealing mechanism. The oxygen sensor based on the electrochemical cell can be used for high temperature (250-700°C) high-pressure (atmospheric-100 MPa) hydrothermal system oxygen fugacity or oxygen activity in-situ direct measurement, which solves the existing working temperature and pressure of various oxygen chemical sensors used in high-pressure hydrothermal systems It is not high (difficult to exceed 400°C and 40 MPa at the same time), slow response speed, and questionable reliability when used in complex concentrated water fluid samples.

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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