Release of chlorine during combustion of raw biomass in boilers is detrimental as it contributes to slagging, fouling, and corrosion. Combustion of torrefied biomass can alleviate such issues, as it contains less chlorine than its raw biomass precursor. This work assessed the effect of the furnace temperature on the chlorine content of generated torrefied biomass and the released gaseous species during the torrefaction process (a mild pyrolysis). The selected biomass was corn straw, which was torrefied at furnace temperatures in the range of 250–400 °C under atmospheric pressure in an inert nitrogen flow. Upon torrrefaction, corn straw lost 32–50% of its original mass to the gas phase, accompanied by more than half of its original mass of chlorine in nearly all cases. The major chlorinated species in the evolving pyrolysis gas (“torgas”) were identified as CH₃Cl and HCl. The former was more prevalent at the lower temperatures (<350 °C), whereas the latter dominated at the highest temperature (400 °C). Finally, emissions of other released gases, such as CO, CO₂, C₂H₆, NO_x, HCN, and NH₃, were also monitored and reported herein.

中文翻译：

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不同温度下玉米秸秆干燥过程中含氯气体的演变

锅炉中的原始生物质燃烧过程中释放的氯是有害的，因为它会导致结渣，结垢和腐蚀。烘焙过的生物质的燃烧可以缓解此类问题，因为它的氯含量低于其原始生物质前体。这项工作评估了炉温对烘焙过程（温和的热解）过程中生成的烘焙过的生物质和释放的气态物种中氯含量的影响。选定的生物质为玉米秸秆，该秸秆在惰性氮气流中于大气压下在250-400°C的炉温下被烘干。经过干馏，玉米秸秆在气相中损失了其原始质量的32％至50％，几乎在所有情况下都伴随着其一半以上的氯质量。₃ Cl和HCl。前者在较低温度（<350°C）下更为普遍，而后者在最高温度（400°C）下占主导地位。最后，本文还监测并报告了其他释放气体的排放，例如CO，CO ₂，C ₂ H ₆，NO _x，HCN和NH ₃。