A system for on-line testing of high-temperature corrosion of water-cooled walls

Abstract

The invention discloses a system for realizing online testing of high-temperature corrosion of water-cooled walls, including a water-cooled wall thickness monitoring system, a flue gas sampling and pretreatment system, a flue gas analysis system, and a data processing system. The water-cooled wall thickness monitoring system can use ultrasonic The propagation characteristics of the pulse in the medium can accurately measure the thickness of the water wall; the flue gas sampling and pretreatment system makes the flue gas at each measuring point enter the gas mixing pipe after dust removal and dehydration treatment, and then lead to the subsequent flue gas analysis system; the flue gas analysis system can Measurement of O in the drawn flue gas 2 , CO, SO 2 、H 2 Atmosphere concentration such as S; the data processing system can calculate and predict the high temperature corrosion degree and change trend of the water wall by combining the wall thickness change and flue gas composition analysis data. The system has a reasonable structure and stable operation. It can accurately and timely monitor the situation and trend of high-temperature corrosion of the water wall to ensure the safety of the heating surface of the boiler. The application cost is low and it is scalable.

Description

technical field [0001] The invention belongs to the field of high-temperature corrosion monitoring of power station boilers, and in particular relates to a system for realizing online testing of high-temperature corrosion of water-cooled walls. Background technique [0002] The high-temperature corrosion of the water-cooled wall of the power plant boiler refers to the corrosion phenomenon of the water-cooled wall pipe in the high-temperature flue gas environment on the flue gas side and the high temperature of the pipe wall. Studies have shown that the reducing atmosphere near the water-cooled wall is the cause of high-temperature corrosion phenomenon, however due to low NO X With the widespread application of staged combustion technology, the main combustion area of ​​large power plant boilers is often in an oxygen-poor state and its water-cooled wall temperature is high, which often leads to severe high-temperature corrosion. Existing technologies often cannot timely and a...

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Problems solved by technology

[0005] The purpose of the present invention is to provide an online monitoring system for the wall thickness and high-temperature corrosion degree of the water-cooled wall, so as to solve the problems of low monitoring accuracy, poor reliability and system stability of the boiler water-cooled wall high-temperature corrosion degree

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