Progression towards Online Tar Detection Systems
Progression towards Online Tar Detection Systems
复制标题
在线焦油检测系统的进展
DOI：
10.1016/j.egypro.2017.12.143
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Capper S
中科院分区：
文献类型：
--
作者：
Capper S
生物质气化技术商业化的最禁止的方面是产品气体的焦油结垢。焦油的存在会影响气化系统的效率，并损害气体质量，使其对于一些对气体质量敏感的下游应用不太有用。在文献中报道了各种焦油检测方法，其可以区分为离线和在线技术。然而，离线技术被发现耗时、扩展性强，并且需要足够的仪器和知识才能获得可靠的结果。近年来，基于焦油组分光谱信息的焦油在线检测技术得到了广泛的研究。其中，荧光光谱法是一种非常有前途的技术，用于提供焦油水平的独特的、非侵入性的和真实的时间数据收集，其可以容易地安装在气化产物气流上。本文介绍了一种低成本的基于LED诱导荧光的焦油检测系统的初步工作。该检测系统主要由光电倍增管、发光二极管（发射波长280 nm）和300 nm长通彩色滤光片组成。初始实验已经进行了不同浓度（0至100重量%）的苯酚（用作模型焦油化合物）和生物油样品从内部，下吸式（喉）固定床气化系统。结果表明，在不同浓度下，苯酚和气化炉生物油的荧光呈线性增加。
The most prohibitive aspect with the commercialisation of biomass gasification technology is tar fouling of the product gas. The presence of tar impacts the efficiency of gasification systems and compromises gas quality, rendering it less useful for some downstream applications sensitive to gas quality. Various tar detection methods are reported in the literature which can be differentiated into offline and online techniques. However, offline techniques are found to be time consuming, expansive and require sufficient instrumentation and knowledge to achieve reliable results. Recent advances in online tar detection based on spectral information of individual tar component have attracted much research attention. Among these, fluorescence spectroscopy is a highly promising technique for the provision of distinctive, non-invasive and real time data collection for tar levels which can be easily installed on gasification product gas streams. This paper presents the initial work on developing a low cost tar detection system based on LED induced fluorescence. The detection system mainly consists of a photomultiplier tube (PMT), LED (emission wavelength of 280 nm) and 300 nm longpass colour glass filter. Initial experiments have been carried out with different concentrations (0 to 100 wt%) of phenol (used as a model tar compound) and bio-oil samples from an in-house, downdraft (throated) fixed bed gasification system. The results show a linear increase of fluorescence with phenol and the gasifier bio-oil at different concentrations.