Flow wet, team humidity measuring instrument of bilayerpipe direct heating type

Abstract

A flowing wet ¿C steam humidity measurer of double layer tube direct ¿C heating type is prepared as connecting inlet section to heating section being connected to outlet section, setting middle layer heating tube in outer jacket of internal layer heating tube at heating section, setting external layer support tube in outer jacket of middle layer heating tube, insulating said tubes to each other and holding gap between them, connecting inlet section to one end of heating section by left connection component and outlet section to another end of heating section by right connecting component, setting directional needle tube in inlet section and connecting said needle tube to piping connection box of outlet section.

Description

technical field [0001] The invention belongs to the field of measuring the humidity of flowing wet steam, in particular to a measuring instrument for measuring the humidity of flowing wet steam by means of direct heating of double-layer tubes. Background technique [0002] Flowing wet steam is used in many fields, especially in condensing steam turbines including conventional power plant steam turbines, nuclear power plant steam turbines, and geothermal power plant steam turbines. The water droplets contained in the steam move with the high-speed steam and impact the rotating parts of the steam turbine at a high speed, which will not only reduce the efficiency of the steam turbine, but also cause abrasion of the rotating parts, and even cause serious accidents. Therefore, in the design and operation of steam turbines, the selection and measurement of the humidity of flowing steam has been widely valued by engineers and technicians. There are many methods for measuring the h...

AI Technical Summary

Problems solved by technology

The heating method used by the humidity probe is to insert a heating element into the channel through which the wet steam sample flows to heat the wet steam, and another tube is concentrically placed outside the tube, and in the cavity between the two tubes Evacuated to reduce heat loss due to convection; heat loss due to radiation and heat conduction from both ends is not considered

[0005] Since the existing heating method flow wet steam test technology can not well solve the problem of heat loss during the heating process of the flow wet steam, it is difficult to guarantee the accuracy of the heating method humidity measurement; and due to the limitation of the space between the steam turbine stages, the measurement It can only be carried out after the final stage with a large space

Therefore, the measurement technology based on the heating method has not been solved in the narrow space between the steam turbine stages, and it is impossible to provide a humidity monitoring instrument for the long-term operation of the steam turbine.

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