Soft measurement method based on variable-boundary segmentation energy balance, multifunctional wet steam measuring needle and wet steam heat absorption measurement and control device

Abstract

The invention relates to a soft measurement method based on variable-boundary segmentation energy balance, a multifunctional wet steam measuring needle and a wet steam heat absorption measurement and control device. The multifunctional wet steam measuring needle is characterized by consisting of an electric heating rod, an electric heating rod sleeve with uniform and screw pitch-equal convex spiral ribs, a multifunctional wet steam measuring needle outer wall tube, a front sensor seat and a rear sensor seat. The wet steam heat absorption measurement and control device consists of an isothermal sleeve, temperature measuring points distributed on the inner wall and the outer wall of the isothermal sleeve at equal distances and computer online measurement and control equipment. The multifunctional wet steam measuring needle is put in the wet steam heat absorption measurement and control device and is wholly pressed and fixed by an outer sleeve, an outer sleeve flange cover and an outer sleeve flange disc; based on the flowing and heating process mechanism analysis of wet steam in the structure, a soft measurement model and an online calibration model of measurement results are established; and the whole equipment is simple in structure and is suitable for various measurement fields in relation to wet steam two-phase flow, in particular to the measurement of exhaust steam humidity of a condensing turbine.

Description

technical field [0001] The invention relates to the field of on-line measurement of wet steam two-phase flow, which is a soft measurement method based on variable boundary and segmental energy balance, a multifunctional wet steam probe and a wet steam heat absorption measurement and control device, and is especially suitable for condensing steam turbine exhaust Real-time online monitoring of steam humidity and other wet steam two-phase flow, cross-sectional steam content and other wet steam. Background technique [0002] Flowing wet steam exists in a large number of industrial equipment, especially in the operating environment of the low-pressure stage of steam turbines in thermal power plants and all stages of steam turbines in nuclear power plants. The water droplets in the wet steam will pose a safety threat to the steam turbine blades and damage the safety interests, and at the same time directly lead to the reduction of the efficiency of the steam turbine and damage the...

AI Technical Summary

Problems solved by technology

One is that the absolute humidity cannot be given, and the other is that long-term online monitoring cannot be realized

There are three major problems in the heating law: first, the heat balance formula, which is the theoretical basis of the heating method, cannot guarantee the measurement accuracy because the mass flow rate cannot be accurately measured; second, the heat dissipation loss is difficult to accurately determine; third, the measured humidity value is difficult to test experimentally

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