School of Mine, China University of Mining and Technology, 221116 Xuzhou, China; State Key Laboratory of Coal Resources and Safe Mining, 221116 Xuzhou, China.
School of Electrical and Power Engineering, China University of Mining and Technology, 221116 Xuzhou, China.
Bioresour Technol. 2021 Jan;320(Pt B):124328. doi: 10.1016/j.biortech.2020.124328. Epub 2020 Oct 29.
The evolution of CHON functional groups during torrefaction of rice straw at 200-300 °C were investigated. The results showed that 300 °C was more suitable for rice straw torrefaction due to the ideal fuel ratio, energy densification, energy-mass co-benefit index and the significantly improved HHV of the torrefied products. The functional groups such as O-H, N-H, C-H, C = O in the solids decreased with rising temperature accompanied by the releases of HO, CH, CO, CO and NH, et al. At 300 °C, 40.04% of fuel-N was released in the form of NH, HCN, HNCO et al. due to the decomposition of N-A which was the overall N-functionality in the raw rice straw. It is worth noting that the absorbance of NH and HCN has the same order of magnitude as CO. Therefore, the releases of N-containing gases should be highly concerned for the application of torrefaction technology from the environmental perspective.
研究了在 200-300°C 热解条件下稻草中 CHON 官能团的演变。结果表明，300°C 更适合稻草热解，因为此时具有理想的燃料比、能量致密化、能量-质量协同效益指数以及显著提高的热解产物高位热值。随着温度的升高，固体中的 O-H、N-H、C-H、C=O 等官能团减少，同时释放出 HO、CH、CO、CO 和 NH 等。在 300°C 下，由于 N-A 的分解，以 NH、HCN、HNCO 等形式释放出 40.04%的燃料-N，N-A 是原稻草中总的 N 官能团。值得注意的是，NH 和 HCN 的吸光度与 CO 的吸光度处于同一数量级。因此，从环境角度来看，热解技术的应用应高度关注含氮气体的释放。
