High-temperature villiaumite pressure meter

Abstract

The invention discloses a high-temperature villiaumite pressure meter, and the meter is used for measuring the pressure of fluid. The pressure meter comprises a pressure transmitter, and is characterized in that the pressure meter also comprises a pressure transmission device which is provided with a first cavity and a second cavity; the first and second cavities are respectively provided with an opening end, and are separated by a membrane; the opening end of the first cavity is used for the sealing connection with the cavity where the fluid is located; the opening end of the second cavity is in sealed connection with the pressure transmitter; and the interior of the second cavity is provided with a medium for transmitting pressure. The pressure meter provided by the invention can employ high-temperature resistant anticorrosion materials to form the first cavity and the membrane, employs a low-melting-point and low-boiling-point material to serve as the medium for transmitting the pressure in the second cavity, and thereby can be used for the pressure measurement of the high-temperature highly corrosive fluid (villiaumite).

Description

technical field [0001] The invention relates to a pressure detection device, in particular to a pressure gauge for measuring liquid medium. Background technique [0002] The molten salt reactor is a kind of nuclear fission reactor, and its main coolant is a molten mixed salt. The primary coolant of the molten salt reactor uses fluorine salt, and beryllium is usually added to the fluorine salt to form FLiBe molten salt. Under the normal working condition of molten salt reactor, the temperature of fluorine salt is 550-750℃, the pressure is 0-0.5MPa, and it is extremely corrosive. When using a pressure gauge to detect the pressure of a high-temperature liquid, there is a problem that the liquid temperature exceeds the tolerance range of the pressure gauge and cannot be detected. The usual solution is to lengthen the pressure induction pipe in front of the pressure gauge, and cool the temperature of the liquid in contact with the pressure gauge by cooling To within the tempera...

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Problems solved by technology

But this method is not suitable for fluorine salt, because the melting point of fluorine salt is 450°C, if this method of cooling the pressure pipe is used, the temperature of the fluoride salt in the pipe will drop and freeze, and the pressure value cannot be read

Even if the so-called high-temperature diaphragm pressure transmitters are used, the capillaries of these transmitters are usually filled with silicone oil or mercury, and the maximum temperature resistance can only reach 450°C, which is far below the temperature requirements of molten salt reactors.

On the other hand, the commonly used materials for pressure transmitters are 304 stainless steel or 316 stainless steel. Even if they are used in special corrosive environments, they only use materials such as Ha C276, which do not meet the requirements of fluorine salt corrosion resistance.

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