State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, 310027, China.
Environ Sci Pollut Res Int. 2021 May;28(18):22278-22295. doi: 10.1007/s11356-021-12730-2. Epub 2021 Mar 21.
Under the extensive implementation of ultra-low emission facilities, sulfur trioxide (SO) has received increasing attention. This article reviews the measurement techniques for SO in flue gas, which include controlled condensation method (CCM), isopropanol absorption method (IPA), salt method, tunable diode laser absorption spectroscopy (TDLAS), ultraviolet absorption spectroscopy (UVs), and Fourier transform infrared spectroscopy (FTIR). The first three methods are chemical methods, which focus on the extraction of SO from flue gas. With highly reactive nature and relatively low concentrations, which are about 5 mg/m even lower, achieving high-fidelity flue gas sampling and non-destructive extraction of SO is the key to SO measurement. The latter three methods belong to spectroscopic methods, which focus on the principle, system composition, and influencing factor analysis. With real-time response and 1-ppm detection limit, attention is attracted to spectroscopic methods on online measurement. This article comprehensively introduces the measurement techniques for SO concentration in flue gas and presents conclusions so as to enable researchers to decide the direction of further investigation.
在广泛实施超低排放设施的情况下，三氧化硫（SO）受到了越来越多的关注。本文综述了烟道气中 SO 的测量技术，包括控制冷凝法（CCM）、异丙醇吸收法（IPA）、盐法、可调谐二极管激光吸收光谱法（TDLAS）、紫外吸收光谱法（UVs）和傅里叶变换红外光谱法（FTIR）。前三种方法是化学方法，侧重于从烟道气中提取 SO。由于 SO 具有高反应性和相对较低的浓度（即使低至 5mg/m），实现高保真度的烟道气采样和对 SO 的无损提取是 SO 测量的关键。后三种方法属于光谱方法，侧重于原理、系统组成和影响因素分析。由于具有实时响应和 1ppm 的检测限，光谱方法在在线测量方面引起了关注。本文全面介绍了烟道气中 SO 浓度的测量技术，并提出了结论，以便研究人员能够确定进一步研究的方向。
