The development of H2S online monitor device and its application in the boiler high temperature corrosion alleviation
The problem of high temperature corrosion of boiler water wall has always been a difficult problem affecting the safe operation of boiler.In order to solve the problem that H2S is the main medium of high temperature corrosion of boiler water wall,but there is a lack of long-term on-line monitoring device for H2S in the industry,a detection device for measuring H2S in boiler water wall based on tunable diode absorption spectroscopy TDLAS principle was developed.The device was used in a 300 MW power plant boiler for demonstration application,and the performance of the device was tracked and evaluated.The results show that the instrument based on the principle of TDLAS has been running stably for 12 months.The on-line monitoring results of the device show that the H2S in the furnace presents the characteristics of pulse fluctuation,and the H2S concentration exceeds 1 600 μL/L when the H2S concentration is high.In the monitoring,it is found that there is a close relationship between the H2S concentration in the furnace and the operation adjustment.In the process of increasing load,when the operation of two mills is changed into three mills,the H2S concentration at the measuring point of the 23.60 m platform of the front and rear walls increases sharply,from 46 μL/L to 822 μL/L.However,there is no significant correlation between H2S and SO2 at the inlet of the desulfurization tower.The successful development of H2S on-line monitoring device can realize the on-line monitoring of key parameters in the main burner area of the boiler,and serve as the main basis for operators to adjust the operating parameters of the boiler,which is of positive significance for the high temperature corrosion monitoring of the boiler and the digital construction of the boiler.
boilerwater wall tubeshigh temperature corrosionH2Sreducing ambience
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