Boiler water-cooling wall high-temperature corrosion on-line monitoring device and method thereof

Abstract

The invention provides a boiler water wall high-temperature corrosion on-line monitoring device and a method thereof. The device comprises a flue gas sampling pipe, a flue gas analyzer, an industrial computer, a high temperature thermocouple and a monitor. The method comprises the following steps: opening holes of the connection plate between the pipes on the membrane water wall; arranging 1 to 5 layers of measuring points in the height direction of a furnace; sucking flue gas by the flue gas sampling pipe; measuring the concentrations of CO, O2 and SO2 in the flue gas by the flue gas analyzer; and measuring the wall temperature of the wall of the water wall by combining the high temperature thermocouple; and transmitting the measured data to the industrial computer. Meanwhile, the industrial computer receives the data of the primary air speed, the secondary air speed and the air powder concentration of the Oracle database of the MIS system of a power plant, analyzes by modified intangible analytical hierarchy process, calculates the weight of the prior high-temperature corrosion influencing factor, carries out ordering on a real-time basis according to the weight, display the result on the picture of the monitor in a user-friendly manner, and gives a relevant diagnosis suggestion, and requires the line personnel to adjust timely.

Description

technical field [0001] The invention belongs to the field of boiler combustion diagnosis and is closely related to the safe operation of the boiler, in particular to an on-line monitoring device and method for high-temperature corrosion of the water wall of the boiler. Background technique [0002] At present, the vast majority of power plants in China have the situation that the actual coal type deviates from the designed coal type. Due to the shortage of coal resources or the price, the nearby small coal kiln is mixed with the coal, and the coal type changes greatly and frequently. Especially after the coal with high sulfur content is put into the furnace, it will cause high-temperature corrosion of the boiler tube wall, aggravate the explosion and leakage of the furnace tube, and directly endanger the safe operation of the boiler. This trend is particularly obvious in large-capacity units. [0003] For the mechanism of high temperature corrosion, there have been a lot of ...

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Problems solved by technology

In addition, due to local oxygen deficiency and high temperature in the furnace, loose and porous FeO is easily formed on the metal surface, and a large amount of H2 is generated in an oxygen-deficient reducing atmosphere during the combustion of high-sulfur pulverized coal. 2 S, H 2 S reacts with the oxide film of the water wall and adsorbs various corrosive gases, accelerating high temperature corrosion

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