稳定碳同位素激光检测仪监测生物质燃料掺烧比的研究

Monitoring biomass-coal fuel blending ratio by stable carbon-isotope laser detector

稳定碳同位素激光技术可用于检测煤和生物质的碳同位素比值δ13C,以确定燃煤耦合生物质的掺烧比,且不受含水量影响.本文通过对煤(山西煤、内蒙古煤、贵州煤)和生物质(玉米秸秆、棉花秸秆、木屑、稻壳)混燃烟气进行稳定碳同位素比值测定,在一定的生物质掺烧比范围(碳量基、热量基)内建立在线分析方法得到拟合线性方程y=ax+b,拟合优度R 2>0.99.所得分析方法可用于在线监测生物质掺烧比变化情况,当生物质掺烧比为20%时,误差分析控制在0.5%—2.0%以内.此外,该检测-分析方法能够实时、准确地监测生物质掺烧比,可为国家针对生物质使用量补贴政策的制定和实施提供技术支撑;同时可用于追踪“碳溯源”,推动碳排放监测和碳交易市场的快速发展.

The stable carbon isotope laser technology can be used to detect the carbon isotope ratio of coal and biomass(δ13C)to determine the blending ratio of coal-fired coupled biomass,and is not affected by water content.In this paper,the stable carbon isotope ratio was measured in the flue gas of coal(Shanxi coal,Inner Mongolia coal or Guizhou coal)and biomass(cornstalks,cotton stalks,wood chips or rice husks).The online analysis method was established considering a certain range of biomass blend ratio(carbon-based and calorific value-based)to get the fitted linear equation y=ax+b,and the goodness-of-fit(R 2)exceeded 0.99.The obtained analysis method can be used to on-line monitor the change of the biomass content in the blend.When the biomass blending ratio is 20%,the analysis error is controlled within 0.5%—2.0%.In addition,this detection-analysis method can realtime monitor the biomass blending ratio accurately,which provides technical support for the development and implementation of the national subsidy policy for biomass usage and promotes the rapid development of carbon emission monitoring and the carbon trading market.