Radiocarbon Determination of the Carbon-Based Biomass Blending Ratio by Analysing Flue Gas Emitted from Coupled Combustion

The determination of carbon-based biomass blending ratio was a prerequisite for the large-scale development of the coupled combustion technology of biomass and coal. In this study, the experimental system of the radiocarbon method to detect the carbon-based biomass blending ratio by analyzing the flue gases produced during coupled combustion was built, and the calculation model of the carbon-based biomass blending ratio was proposed, and the accuracy and precision of the radiocarbon method were evaluated. The results showed that there was a good linear relationship between the 14C concentration of CO 2 samples and biogenic fractions in flue gas. The application of the new calculation model improved the accuracy of the 14C determination method, and the relative error increased as the carbon-based biomass blending ratio decreased in the 14C method: the minimum relative error of the carbon-based biomass blending ratio with carbon-based assay was 15.16%,12.21%, 9.61%, 7.96% and 3.13% when considering coal and air simultaneously in AMS analysis. This further validated the 14C determination method as an accurate method for identifying the carbon-based biomass blending ratio in biomass and coal coupled combustion.