Diagnosis and prevention system and method of high temperature corrosion state of boiler water cooled wall

Abstract

The invention relates to diagnosis and prevention system and method of a high temperature corrosion state of a boiler water cooled wall. The system comprises a plurality of temperature sensors, a coal fired quality sampling module, a coal fineness sampling module, a flue gas sampling module, a data layer module, a characteristic layer data processing module and a decision layer module, wherein the temperature sensors collect the temperature of the water cooled wall through a multi-channel A/D conversion collection module; the coal fired quality sampling module sends coal quality information into a coal quality analysis module, and the coal quality analysis module carries out proximate analysis; the coal fineness sampling module sends collected coal fineness information into a fineness analysis module; the flue gas sampling module sends collected flue gas information into a component analysis module; the data layer module carries out wave filtering treatment on the temperature information, the coal quality information, the fineness information and the flue gas information and rejects abnormal data; the characteristic layer data processing module extracts the characteristic quantity from the data after processing of the data layer module; and the decision layer module comprehensively analyzes and judges the data extracted by the characteristic layer data processing module by an expert system to obtain a reasonable and accurate result, and the result is output and participate into operation regulation.

Description

technical field [0001] The invention relates to a system and method for diagnosing and preventing high-temperature corrosion of boiler water-cooled walls. It can provide the current risk level of high-temperature corrosion of the boiler according to the fuel status and the operating status of the boiler, and at the same time provide prevention and control measures combined with an expert system. It provides a way for real-time and intelligent prevention and control of high temperature corrosion of water wall. Background technique [0002] High-temperature corrosion of water-cooled wall tubes in coal-fired boilers is common, and it is one of the main reasons for the thinning of water-cooled wall tubes. It can lead to continuous decline in the effective bearing capacity of tube walls, resulting in water-cooled blasting and unplanned shutdowns. When the corrosion is serious, it often takes a few months to replace some pipe sections, which greatly increases the maintenance cost ...

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Problems solved by technology

[0010] The purpose of the present invention is exactly in order to solve the problem that the high-temperature corrosion of boiler water wall is difficult to detect at present, through research and analysis, determine that the main factor that causes high-temperature corrosion is: (1) S content is greater than 1.0~1.5% in the furnace coal, and contains K, Na and other alkali metals; (2) The air supply in the furnace is insufficient, there is anoxic combustion or the aerodynamic condition in the furnace is poor, and there is a reducing atmosphere in the water wall area; (3) The surface temperature of the water wall is high; (4) The fuel is low Lean coal or anthracite with poor volatile content, and poor burnout; (5) The sulfur content in the sediment on the water wall is high, and the high and low load switching of the boiler or the frequent start and stop cause the sediment layer to fall off, and high temperature sulfur corrosion is prone to occur

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