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30. Determination of biomass-coal blending ratio by C-14 measurement in co-firing flue gas

Author

Tang, Yu-xing, Luo, Zhong-yang, Yu, Chun-jiang, Cen, Jian-meng, Chen, Qian-yuan, Zhang, Wennan, Tang, Yu-xing, Luo, Zhong-yang, Yu, Chun-jiang, Cen, Jian-meng, Chen, Qian-yuan, and Zhang, Wennan

Abstract

To verify the feasibility of using radiocarbon detection for the measurement of the biomass-coal blending ratio in co-firing heat and power plants, C-14 activity detection technology that uses benzene synthesis as the sample preparation method and a liquid scintillation counter as the detection instrument was studied. A benzene synthesis system was built to enrich carbon in the combustion flue gas in the form of benzene. The benzene sample was mixed with scintillator (butyl-PBD) and C-14 activity was measured using a liquid scintillation counter (Quantulus 1220). Three kinds of coal and six kinds of biomass were tested repeatedly. The measured C-14 activity was 0.3365 DPM/gC in Zhundong lignite, 0.2701 DPM/gC in Shenmu bitumite, and 0.3060 DPM/gC in Changzhi anthracite. These values were much higher than the instrument background activity. For the co-fired experiment, we used groups with biomass ratios (based on the carbon) of 6.51%, 12.95%, and 20.75%. A modified empirical expression to determine the biomass, coal blending ratio based on the C-14 activity measured in the co-firing flue gas, was proposed by analyzing and verifying measurement accuracy. From the C-14 measurements of the co-fired samples, the corresponding estimated biomass ratios were (5.540.48)%, (12.310.67)%, and (19.490.90)%. The absolute measurement error was around 1% for a typical biomass-coal co-firing application.

Published
2019
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31. Optical Comparison of Two-stage Reflection Systems Based on ASAP

Author

倪明江 Ni Ming-jiang, 张艳梅 Zhang Yan-mei, 王涛 Wang Tao, 杨天锋 Yang Tian-feng, 骆仲泱 Luo Zhong-yang, and 肖刚 Xiao Gang

Subjects
Physics, Optics, business.industry, Reflection (physics), Stage (hydrology), business, Atomic and Molecular Physics, and Optics
Published
2013

32. Determination of biomass-coal blending ratio by 14C measurement in co-firing flue gas.

Author

Tang, Yu-xing, Luo, Zhong-yang, Yu, Chun-jiang, Cen, Jian-meng, Chen, Qian-yuan, and Zhang, Wen-nan

Abstract

Copyright of Journal of Zhejiang University: Science A is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2019
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35. Experimental Study of Factors Affecting Mercury Speciation in Coal-fired Flue Gases

Author

Cen Kefa, Luo Zhong-yang, Zhou Jin-song, LI Jijing, and Gao Hong-liang

Subjects
Flue gas, Reaction temperature, chemistry, Total hg, Environmental chemistry, chemistry.chemical_element, Coal fired, complex mixtures, respiratory tract diseases, Mercury (element)
Abstract

An experimental set-up was built, on which a bench-scale experimental was conducted to study the effects of HCl, SO2, NO and O2 on the speciation distribution of mercury in simulated coal-fired flue gases. The test method used here for mercury speciation was Ontario Hydro Method. The speciation distribution of mercury in different coal-fired flue gas systems was studied in typical constituent flue gas systems. The conclusions were as follows: HCl was the key substance that reacted with Hg vapor. In the coal-fired flue gas systems without HCl, the conversion ratio of Hg2+ to total Hg would become lower with reaction temperature becoming higher; O2, NO and SO2 could slightly praise the conversion ratio of Hg2+ to total Hg. In the coal-fired flue gas systems containing HCl, the conversion ratio of Hg2+ to total Hg would become higher at elevated temperature; SO2 could decrease the conversion ratio of Hg2+ to total Hg; HCl, NO, O2 could enhance oxidation of Hg vapor.

Published
2007

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