Frilund Christian, Simell Pekka, Kaisalo Noora, Kurkela Esa, Koskinen-Soivi Mari-Leena
VTT Technical Research Centre of Finland Ltd., P. O. Box 1000, FI-02044 Espoo, Finland.
Energy Fuels. 2020 Mar 19;34(3):3316-3325. doi: 10.1021/acs.energyfuels.9b04276. Epub 2020 Feb 24.
Dry-bed adsorptive desulfurization of biomass-based syngas with low to medium sulfur content using ZnO was investigated as an alternative to the conventional wet scrubbing processes. The technical feasibility of ZnO-based desulfurization was studied in laboratory-scale HS breakthrough experiments. The experiments were set up to utilize realistic HS concentrations from gasification and therefore long breakthrough times. Experiments were performed in a steam-rich model biosyngas in varying conditions. The long-term breakthrough experiments showed apparent ZnO utilization rates between 10 and 50% in the tested conditions, indicating intraparticle mass-transfer resistances partly due to space velocity and particle size constraints as well as the most likely product-layer resistances as evidenced by the large spent adsorbent surface area decrease. An empirical deactivation model to estimate full breakthrough curves was fitted to the laboratory-scale experimental data. Breakthrough experiment in tar-rich syngas was also performed with the conclusion that ZnO performance is not significantly affected by hydrocarbons despite carbon deposition on the particle surfaces.
研究了使用氧化锌对低至中等硫含量的生物质合成气进行干床吸附脱硫，作为传统湿法洗涤工艺的替代方法。在实验室规模的硫化氢穿透实验中研究了基于氧化锌脱硫的技术可行性。进行这些实验是为了利用来自气化过程的实际硫化氢浓度，因此具有较长的穿透时间。实验在不同条件下的富含蒸汽的模型生物合成气中进行。长期穿透实验表明，在测试条件下氧化锌的表观利用率在10%至50%之间，这表明颗粒内传质阻力部分归因于空速和粒径限制，以及由大量废吸附剂表面积减小所证明的最可能的产物层阻力。将一个用于估计完整穿透曲线的经验失活模型拟合到实验室规模的实验数据中。还在富含焦油的合成气中进行了穿透实验，得出的结论是，尽管颗粒表面有碳沉积，但氧化锌的性能并未受到烃类的显著影响。
