A pH chemical sensor for high pressure hydrothermal system and preparation method thereof
A chemical sensor, high-pressure water technology, applied in the field of pH chemical sensors, to achieve good sealing efficiency, avoid the effect of reducing operating temperature and pressure
Active Publication Date: 2018-04-06
INST OF GEOCHEM CHINESE ACADEMY OF SCI
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[0004] The purpose of the present invention: to provide a chemical sensor for in-situ measurement of pH value in high-pressure hydrothermal system and its preparation method, so as to solve the problem that the existing technology cannot operate in the environment where the temperature and pressure are respectively 400-700°C and 35-100 MPa The problem of working stably and reliably in
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[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0027] 1. The manufacture and assembly of the YSZ working electrode of the present invention. Such as figure 1As shown, the YSZ working electrode is mainly composed of a base 7, a frustum-shaped high-temperature-resistant insulating cone pad 6, a solid oxygen buffer 4, a high-temperature-resistant insulating cone sleeve 2, a conical-shaped YSZ ceramic 1, an inert metal sheet 3, and a working electrode lead 5, etc. composition. Among them, the base 7 is made of a high-temperature nickel-based alloy. One end of the nickel-based 7 alloy base has a taper hole, and the other end has a through hole communicating with the taper hole; pyrophyllite is used to make a frustum-shaped high-temperature-resistant insulating cone pad 6 and a durable The high-temperature insulat...
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The invention discloses a pH chemical sensor for a high-pressure hydrothermal system and a preparation method thereof. The pH chemical sensor for the high-pressure hydrothermal system comprises a YSZ working electrode and an external pressure balance type Ag / AgCl reference electrode, the YSZ working electrode is composed of a base, a circular-table-shaped high-temperature-resistance insulating cone mat, a high-temperature-resistance insulating cone sleeve, solid oxygen buffering agents, an inert metal sheet, circular-table-shaped YSZ ceramic, a working electrode lead and the like, and all parts are combined to form a cone-shaped self-tightening sealing mechanism. According to the pH chemical sensor for the high-pressure hydrothermal system and the preparation method thereof, the maximum working temperature and the maximum pressure of the pH chemical sensor greatly exceed an existing specially-made glass electrode sensor with the maximum working temperature not more than 254 DEG C and an existing YSZ electrode sensor with the maximum working temperature not more than 400 DEG C and the maximum pressure not more than 35 MPa, the stability and the reliability of the pH chemical sensor are obviously superior to an existing metal and metallic oxide sensor, and meanwhile the problem that larger temperature gradients of a water fluid sample in a high-temperature pressure container are caused by an existing YSZ electrode sensor is effectively avoided.
Description
technical field [0001] The invention relates to a pH chemical sensor, in particular to a pH chemical sensor applicable to a high-pressure hydrothermal system and a preparation method thereof. Background technique [0002] The pH value of the high-temperature and high-pressure hydrothermal system is an important physical and chemical parameter of the system, which has an extremely important impact on the composition, structure, properties, and occurrence and development of the system. Therefore, no matter in high-pressure hydrothermal scientific experiments, field detection or such as In the fields of high-pressure hydrothermal material synthesis, high-temperature hydrometallurgy, metal corrosion and protection, chemical industry, supercritical water extraction and oxidation, nuclear energy engineering, etc. Basic work on high-temperature and high-pressure hydrothermal systems and control of high-pressure hydrothermal processes. The chemical sensor method based on Ag / AgCl re...
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IPC IPC(8): G01N27/30
Inventor 李和平徐丽萍李娟徐惠刚杨美琪
Owner INST OF GEOCHEM CHINESE ACADEMY OF SCI