Department of Chemical Engineering, University College London, London WC1E 7JE, United Kingdom; Advanced Plasma Power, Swindon, Wiltshire SN3 4DE, United Kingdom.
Waste Manag. 2014 Jan;34(1):28-35. doi: 10.1016/j.wasman.2013.10.005. Epub 2013 Oct 28.
Often perceived as a Cinderella material, there is growing appreciation for solid waste as a renewable content thermal process feed. Nonetheless, research on solid waste gasification and sulphur mechanisms in particular is lacking. This paper presents results from two related experiments on a novel two stage gasification process, at demonstration scale, using a sulphur-enriched wood pellet feed. Notable SO2 and relatively low COS levels (before gas cleaning) were interesting features of the trials, and not normally expected under reducing gasification conditions. Analysis suggests that localised oxygen rich regions within the fluid bed played a role in SO2's generation. The response of COS to sulphur in the feed was quite prompt, whereas SO2 was more delayed. It is proposed that the bed material sequestered sulphur from the feed, later aiding SO2 generation. The more reducing gas phase regions above the bed would have facilitated COS--hence its faster response. These results provide a useful insight, with further analysis on a suite of performed experiments underway, along with thermodynamic modelling.
通常被视为灰姑娘材料的固体废弃物，作为可再生的热过程原料，其价值正日益受到重视。尽管如此，针对固体废弃物气化和硫机制的研究仍然缺乏。本文介绍了在新型两段式气化工艺的两个相关实验中的结果，该工艺在示范规模下使用富硫木屑颗粒作为进料。试验中引人注目的 SO2 和相对较低的 COS 水平（在气体净化之前）是其特点，在还原气化条件下通常不会出现这种情况。分析表明，流化床内局部富氧区在 SO2 的生成中发挥了作用。COS 对进料中硫的响应非常迅速，而 SO2 的响应则较为滞后。据推测，床料从进料中隔离出硫，随后有助于 SO2 的生成。床层上方更具还原性质的气相区域会促进 COS 的生成，因此其响应速度更快。这些结果提供了有用的见解，正在对一系列已进行的实验进行进一步分析，并结合热力学模型进行分析。
