Early warning method for failure of water-cooling wall of power boiler

Abstract

The invention relates to a water cooling wall on-line failure early warning method, which comprises the following steps: water power calculation, metal wall temperature calculation, stress analysis, fatigue life consumption analysis, creeping life consumption analysis and entire life consumption analysis. The method calculates the parameters of the flow rate of all pipes of a pipe set, inlet and outlet pressure, wall temperature values in a furnace of each section of the pipes along the length, stress change amplitude values, and the like through a flow and heat conduction rule in real time on line. A small amount of measuring points which are distributed in the pipe sections of each radiation area provided with flow and heat conduction representation and the existing furnace outside inlet and outlet measuring points are combined as calculating and checking points, and the calculating and checking points are input into a computer to calculate and process so as to judge whether unsafe factors of unstable water power, overhigh temperature, fatigue creeping destroy, and the like exist or not. A calculating result displays and records relevant data in real time, and is used as a reference for judging whether the wall cooling wall is safely operated or not so as to achieve the optimal operation of equipment, arrange the examination and maintenance management according to the state, and fully implement equipment state overhaul.

Description

Technical field [0001] The invention relates to the technical field of power station boiler safety, and relates to an early warning method for water wall failure of a power station boiler. Background technique [0002] Ultra (super) critical pressure power generation technology is now a mature technology, which has the characteristics of high efficiency, low emissions, easy peak regulation, and stable operation. However, in actual operation, the thermal deviation of the water wall will cause the flow deviation to expand, resulting in deviation in the pipeline. The physical properties of mass and heat change drastically, resulting in flow deviation and heat transfer deterioration, which increases the deviation of water wall temperature, which is much more harmful than critical natural circulation boilers. However, traditional measurement methods cannot set a large number of measuring points in the furnace due to technical constraints, and measure the real-time changes of the entir...

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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