Water-cooled wall on-line safe evaluation method

Abstract

The invention relates to an on-line safety evaluation method for water-cooled walls. The method comprises the following steps: arranging a small amount of test points in the pipeline section with typical flow heat transfer in each radiation zone, combining with the existing test points at the entrance and exit outside the furnace, calculating and checking the characteristic parameters of the inner wall of the water-cooled wall of the station boiler, inputting to a computer for calculation, performing the on-line real-time calculation of the Parameters such as pipeline flow, entrance and exit pressures, enthalpy value, lengthwise furnace inner wall temperature of each pipeline section and stress change value, to judge whether the dangerous factors exist, such as hydrodynamic instability, over-temperature and creep fatigue, displaying the calculation results in real time, recording the data as judgment basis of safe operation of the water-cooled wall. The invention realizes the optimal operation of equipment, manages the repair and maintenance based on the operational state, and ensures the state maintenance and repair of 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 judgment of flow pulsation, wall temperature overheating, and fatigue creep fracture of a water cooling wall by monitoring a small amount of characteristic parameters in a water cooling wall tube and using flow heat transfer calculations. Background technique [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 ...

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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