caa a22 4500 606200290 CHVBK 20210128100943.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s10653-014-9648-x doi (NATIONALLICENCE)springer-10.1007/s10653-014-9648-x Measurement of slurry droplets in coal-fired flue gas after WFGD [Elektronische Daten] [Xue-Cheng Wu, Hua-Feng Zhao, Yong-Xin Zhang, Cheng-Hang Zheng, Xiang Gao] China owns the world's largest capacity of coal-fired power units. By the end of 2012, the capacity of installed national thermal power has been 819.68million kilowatts. The latest standard requires that newly built power plants emit SO2 in no more than 100mg/m3 and the emission of old ones be lower than 200mg/m3 while in some key areas the emission should be controlled under 50mg/m3. So by the end of 2012, 90% of the active coal-fired units have been equipped with flue gas desulfurization devices. Among the desulfurization methods adopted, limestone-gypsum wet flue gas desulphurization accounts for 92%, causing the problem of fine droplets in the exhaust gas after defogger, which may even form "gypsum rain.” At present, sampling methods are widely used at home and abroad, such as magnesium ion tracer method, modified magnesium ion tracer method and chemical analysis. In addition, some scholars use aerodynamic methods, such as ELPI, to measure the diameter distribution and concentration. The methods mentioned above all have their own demerits, such as the inability to on-line, continuous measurements and the need of prolonged measuring time. Thus, in this paper some potential optical on-line methods are presented, such as Fraunhofer diffraction pattern analysis and wavelength-multiplexed laser extinction. Also brought up are their measuring scope and merits. These methods have already been utilized to measure small liquid droplets and their demonstrations and evaluations are as well stated. Finally, a 3D imaging method based on digital holographic microscope is proposed for in-line measurement of size and concentration of slurry droplets. The feasibility of this method is demonstrated by preliminary experimental investigation. Springer Science+Business Media Dordrecht, 2014 Slurry droplet nationallicence Concentration measurement nationallicence Wet flue gas desulphurization nationallicence Defogger nationallicence Coal-fired power plant nationallicence Wu Xue-Cheng State Key Laboratory of Clean Energy Utilization, Zhejiang University, 310027, Hangzhou, China aut Zhao Hua-Feng State Key Laboratory of Clean Energy Utilization, Zhejiang University, 310027, Hangzhou, China aut Zhang Yong-Xin State Key Laboratory of Clean Energy Utilization, Zhejiang University, 310027, Hangzhou, China aut Zheng Cheng-Hang State Key Laboratory of Clean Energy Utilization, Zhejiang University, 310027, Hangzhou, China aut Gao Xiang State Key Laboratory of Clean Energy Utilization, Zhejiang University, 310027, Hangzhou, China aut Environmental Geochemistry and Health Springer Netherlands 37/5(2015-10-01), 915-929 0269-4042 37:5<915 2015 37 10653 https://doi.org/10.1007/s10653-014-9648-x text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10653-014-9648-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wu Xue-Cheng State Key Laboratory of Clean Energy Utilization, Zhejiang University, 310027, Hangzhou, China aut NATIONALLICENCE 700 1- Zhao Hua-Feng State Key Laboratory of Clean Energy Utilization, Zhejiang University, 310027, Hangzhou, China aut NATIONALLICENCE 700 1- Zhang Yong-Xin State Key Laboratory of Clean Energy Utilization, Zhejiang University, 310027, Hangzhou, China aut NATIONALLICENCE 700 1- Zheng Cheng-Hang State Key Laboratory of Clean Energy Utilization, Zhejiang University, 310027, Hangzhou, China aut NATIONALLICENCE 700 1- Gao Xiang State Key Laboratory of Clean Energy Utilization, Zhejiang University, 310027, Hangzhou, China aut NATIONALLICENCE 773 0- Environmental Geochemistry and Health Springer Netherlands 37/5(2015-10-01), 915-929 0269-4042 37:5<915 2015 37 10653