Temperature difference flow meter for high temperature liquid metal

Abstract

The invention relates to a temperature difference flow meter for high temperature liquid metal, which realizes flow measurement for the high temperature liquid metal on basis of the temperature difference measurement principle. The temperature difference flow meter for the high temperature liquid metal structurally includes a sensor and a converter. The high temperature liquid metal is subjected to heat loss when flowing along a pipeline and the temperature difference comes into being along the flow direction. When the flow velocity changes, the heat loss along the pipeline per unit length correspondingly changes and the temperature difference changes linearly. The sensor measures the thermal electromotive force produced in the pipeline per unit length due to the temperature difference, and the converter analyzes and computes to obtain the flow rate of the high temperature liquid metal. The temperature difference flow meter can measure the low rate of liquid metal with temperature between 200 DEG C and 1250 DEG C; and meanwhile, the installation is flexible, so that the requirement on external conditions such as the fluid drive system is lowered.

Description

technical field [0001] The invention relates to a high-temperature liquid metal temperature difference flowmeter, which belongs to the field of energy and material engineering. Background technique [0002] Liquid metals, such as mercury, sodium, lead-bismuth, etc., have been selected as coolant materials for advanced fast neutron reactors due to their good thermal conductivity and neutron properties. Coolant liquid metals (sodium, lead, bismuth, etc.) used in fast neutron reactors have high melting points, and their normal operating temperature ranges from 200°C to 600°C. At the same time, due to their good heat transfer characteristics and tritium breeding characteristics, liquid metal lithium and lithium lead are preferentially selected as coolant materials and tritium breeding materials in the reactor in the future research of advanced nuclear fusion reactors. In order to study the corrosion of liquid metal on reactor materials and its thermal characteristics, many coun...

AI Technical Summary

Problems solved by technology

[0003] There are many types of flowmeters, such as electromagnetic flowmeters, vortex flowmeters, throttling flowmeters, ultrasonic flowmeters, thermal mass flowmeters, differential pressure flowmeters, volumetric flowmeters, etc. The most prominent features are: There are many types of flowmeters, and their measurement principles, structural characteristics, scope of use, and methods of use are different, but each has its specific applicability and limitations.

In terms of the scope of use, there are currently few types of flowmeters used for liquid metal measurement. Although the good conductivity of liquid metals can give priority to electromagnetic flowmeters, the maximum temperature that electromagnetic flowmeters can be used is only 400 ° C, and there is poor signal stability. , Need to consider the wettability of liquid metal and pipe wall material and other shortcomings

However, due to the limitations of the Curie temperature of piezoelectric materials, the wettability of ultrasonic probes and liquid metal, and the coupling of ultrasonic propagation at different interfaces, ultrasonic flowmeters have great technical difficulties in liquid metal measurement.

At the same time, considering the physical properties of liquid metal and the drive of liquid metal, other types of flowmeters are often difficult to apply to the measurement of high-temperature liquid metal.

Images