Abstract
Scanning electron microscopy (SEM) micro-morphology analysis, X-ray diffraction (XRD) and energy-dispersive X-ray diffraction (EDX) component analysis were conducted on the fouling of continuous emission monitoring system (CEMS) sampling tube at the outlet of limestone-gypsum wet flue gas desulfurization (WFGD) of unit 1 in a 600 MW supercritical coal-fired power plant in Inner Mongolia Autonomous Region. The results show that the main component of fouling was ammonium dihydrogen phosphate, which was generated by the reaction between phosphoric acid in the phosphoric acid titration device and the NH3 escaping from the selective catalyst reduction (SCR) denitrification system, and corresponding treatment measures were taken. It indicates that the average value of ammonia escape was reduced from 1.79 ppm to 1.54 ppm through the ammonia injection optimization test of the SCR denitrification system (at the load of 410 MW of the unit), which effectively reduced the generation of fouling. This research provides reference for improving the reliability of coal-fired unit operation after ultra-low emission transformation.
Highlights
1.1.Continuous emission monitoring system The continuous emission monitoring system (CEMS) is the most important monitoring equipment in the flue gas desulfurization (FGD) system
We must take into account that as China’s coal-fired units gradually enter the “post-era” of ultra-low emission transformation, problems have become gradually prominent in the operation of some flue gas treatment facilities
As an important facility for testing the flue gas treatment facilities on the atmospheric pollutant treatment level, CEMS is critical in the operation of coal-fired power plants
Summary
1.1.Continuous emission monitoring system The continuous emission monitoring system (CEMS) is the most important monitoring equipment in the flue gas desulfurization (FGD) system. It is used to monitor the situation of the atmospheric pollutants processed by the FGD system, including particles, gaseous pollutants, and flue gas emission parameters [1]. The environmental protection authorities govern the emissions of atmospheric pollutants from thermal power plants by monitoring the real-time data of CEMS and impose economic penalties and administrative accountability on power plants that cannot stably meet the emission standards [2,3]. One set of wet flue gas desulfurization (WFGD) system is generally equipped with two sets of CEMS. General monitoring parameters include SO2, NOx, particles, O2, flue gas flow, temperature, pressure, and humidity in the WFGD inlet flue and outlet flue [4,5]
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