An on-line safety assessment method of water wall

Abstract

The invention relates to an on-line safety assessment method of a water wall, comprising the following steps: firstly arranging a few test points at the pipe section with flow heat transfer representativeness in each radiated area for being combined with the existing inlet and outlet test points outside the furnace, monitoring characteristic parameters in the water wall pipes of the station boiler as calculation and checking point, inputting the characteristic parameters into a computer for processing, and computing the parameters such as the flow rate, the pressure of the inlet and outlet, the enthalpy value, the temperature value of furnace inner wall of each section of pipe along the length, the amplitude value of the variation of stresses and the like of all pipes in the group on line and in real time through a flow heat transfer law so as to judge whether unsafe factors including the instable hydrodynamic force, excess temperature, creep fatigue damage and the like occurs. The computed result is displayed in real time, and the related data is recorded as the basis for judging whether the water wall is in safe operation, thereby realizing optimized running of the equipment, arranging examination and maintenance management according to the state and fully implementing the examination and reparation based on the condition of the equipment.

Description

technical field [0001] The invention relates to the technical field of power station boiler safety, and relates to a safety evaluation technology for online judging whether flow pulsation, wall temperature over-temperature and fatigue creep rupture occur in a water-cooled wall by monitoring a small number of characteristic parameters in a water-cooling wall tube and using flow heat transfer calculation. Background technique [0002] Ultra (super) critical pressure power generation technology is now a mature technology, which has the characteristics of high efficiency, low emission, easy peak regulation, and stable operation. However, in actual operation, the thermal deviation of the water-cooled wall will lead to the expansion of the flow deviation, resulting in the deviation of internal work in the tube. The physical properties of mass and heat change drastically, resulting in flow deviation and heat transfer deterioration, which increases the wall temperature deviation of t...

AI Technical Summary

Problems solved by technology

[0002] Ultra (super) critical pressure power generation technology is now a mature technology, with the characteristics of high efficiency, less emissions, easy peak regulation, and stable operation. Mass-thermal physical properties change drastically, resulting in flow deviation and heat transfer deterioration, which increases the temperature deviation of the water-cooled wall, and its harm is much more serious than that of the critical natural circulation boiler

However, due to technical constraints, the traditional measurement method cannot set a large number of measuring points in the furnace to measure the real-time changes of the entire furnace working condition, and the calculation relies on a large number of empirical parameters, which makes the error value of the calculated result too large

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