Measuring method of corrosion degree of desulfuration flue gas to chimney

Abstract

The invention discloses a measuring method of corrosion degree of desulfuration flue gas to a chimney. The method is characterized by detecting the corrosion degree of the chimney through a thermal infrared imager, and comprises the following steps that (1) an internal temperature ti of the chimney is confirmed according to a chimney temperature control device; (2) an external air temperature t0 of the chimney is measured actually by a thermometer; an external surface temperature tw0 of the chimney is measured actually by the thermal infrared imager; (3) entire thermal resistance R0 of walls of the chimney is confirmed according to material composition and thickness of the chimney; (4) a uniform temperature part is found out from a thermogram of a certain section of the walls of the chimney to serve as a reference area; external surface thermal exchange resistance Rw of the walls of the chimney is computed by a formula; and (5) thermal resistance R01 of an individual abnormal temperature point is computed; and the corrosion thickness of the internal wall of the chimney is computed according to variation of the thermal resistance. The method detects the chimney by utilizing the thermal infrared imager, and can infer whether defects exist in a detected object, and the magnitude of a defect range after temperature variation is tested.

Description

technical field [0001] The invention relates to non-destructive testing of buildings and structures, in particular to a method for measuring the corrosion degree of the chimney by desulfurization flue gas under the working condition of normal power generation operation of the power plant unit after the chimney of the thermal power plant is subjected to anticorrosion transformation due to wet desulfurization. Background technique [0002] Since January 1, 2004, the State Environmental Protection Administration promulgated and implemented the "Emission Standard of Air Pollutants for Thermal Power Plants" (GB13223-2003), most of my country's coal-fired thermal power plants have adopted wet flue gas desulfurization technology, after desulfurization absorption tower The humidity of the flue gas is close to the saturation state, the pressure drops when the flue gas rises along the chimney, and the adiabatic expansion makes the flue gas cool and reach the wet saturation. The hot sat...

AI Technical Summary

Problems solved by technology

[0003] The traditional detection of chimney corrosion degree is to use core sampling method to detect when the unit is shut down, which not only damages the anti-corrosion layer of the chimney lining, but also affects the normal operation of the generator set. Due to the fact that there are many high-altitude operations in the detection work site sampling , the risk is high, the risk is high, and the post-test analysis of the on-site samples takes a long time, the whole process is time-consuming and laborious

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