SYSTEM AND METHOD FOR MEASURING CARBON CONTENT OF FLY ASH USING HOLLOW METALLIC WAVEGUIDE UNDER DYNAMIC CONDITIONS

摘要

The present invention provides a system and method for detecting the carbon content of fly ash by a hollow metallic waveguide under dynamic conditions. The system comprises a bypass measurement unit for collecting fly ash arriving from a flue in real time, and a measurement device. The measuring method comprises: first, introduce a standard fly ash sample of same coal into the hollow metallic waveguide for measurement to obtain data of the amplitude and phase of S21 of the standard fly ash sample, and fit the data to obtain a fitting relational expression of the standard fly ash sample at different frequency points; and start an air compressor to introduce fly ash in the flue into the hollow metallic waveguide through a jet device and a cyclone separator, select any frequency point through a vector network analyzer to measure the introduced fly ash to obtain data of the amplitude and phase of S21 of a fly ash sample to be measured, substitute the data of the amplitude and phase of S21 into the relational expression to calculate the carbon content. The present invention has higher resolution and measurement accuracy, the measurement results between different carbon contents are relatively stable and obvious, every 2% increase in the carbon content corresponds to a 15-20° change in the amplitude of the S21 parameter, and therefore the accuracy is better.