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| Content Provider | Springer Nature Link |
|---|---|
| Author | Wu, Xue Cheng Zhao, Hua Feng Zhang, Yong Xin Zheng, Cheng Hang Gao, Xiang |
| Copyright Year | 2014 |
| Abstract | 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 819.68 million kilowatts. The latest standard requires that newly built power plants emit SO2 in no more than 100 mg/m3 and the emission of old ones be lower than 200 mg/m3 while in some key areas the emission should be controlled under 50 mg/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. |
| Starting Page | 915 |
| Ending Page | 929 |
| Page Count | 15 |
| File Format | |
| ISSN | 02694042 |
| Journal | Environmental Geochemistry and Health |
| Volume Number | 37 |
| Issue Number | 5 |
| e-ISSN | 15732983 |
| Language | English |
| Publisher | Springer Netherlands |
| Publisher Date | 2014-09-25 |
| Publisher Place | Dordrecht |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Slurry droplet Concentration measurement Wet flue gas desulphurization Defogger Coal-fired power plant Environmental Health Geochemistry Terrestrial Pollution Soil Science & Conservation Environmental Chemistry Public Health |
| Content Type | Text |
| Resource Type | Article |
| Subject | Environmental Chemistry Medicine Geochemistry and Petrology Environmental Engineering Water Science and Technology |
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