Research and application on synchronous on-line measurement of temperature field and high temperature corrosive atmosphere field in coal-fired boiler
The economic,safety,and environmental implications of the combustion processes within the primary combustion zone of coal-fired boilers are pivotal for the development of intelligent power plants.Among these considerations,real-time online monitoring of H2S and CO gas concentrations,attributed to high-temperature corrosion near the water-cooling wall,holds particular significance.Employing infrared thermal imaging technology and tunable semiconductor laser absorption spectrum measurement technology,we synchronously measure the temperature field and high-temperature corrosion atmosphere field in the primary combustion zone of coal-fired boilers.Utilizing the infrared thermal imaging principle,we developed application software for LabVIEW temperature real-time acquisition,employing the Optris-PI1M small infrared thermal imager.Continuous monitoring of the temperature field in the primary combustion zone was conducted at the furnace observation port.A low-cost communication band laser,operating near 1.5 μm,serves as the laser source for high-temperature corrosive gases H2S and CO.Simultaneous monitoring of H2S and CO gas concentrations is achieved through the combination of wavelength modulation spectroscopy and frequency division multiplexing technology,as validated by a linearity experiment with a correlation coefficient of 0.999 5.The developed synchronous measuring instrument was employed for field measurements in the main combustion zone of a 300MW tangential coal-burning boiler.Results indicate that the temperature in the boiler predominantly falls within the 1 300-1 400℃range,with the highest temperature recorded at 1 500℃.H2S concentration fluctuates between 12～125 mg/m3,while CO concentration primarily ranges from 10%～20%,peaking at 22%.Positive correlation exists between H2S and CO concentrations,with oxygen levels maintained below 1%.The anaerobic combustion conditions lead to an increase in the concentrations of these gases,resulting in high-temperature corrosion near the water-cooling wall.
Coal-fired boilersHigh temperature corrosionInfrared thermal imagingLaser absorption spectrumOn-line monitoring
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