On-Line Analysis and Kinetic Behavior of Arsenic Release during Coal Combustion and Pyrolysis
العنوان: | On-Line Analysis and Kinetic Behavior of Arsenic Release during Coal Combustion and Pyrolysis |
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المؤلفون: | Fenghua Shen, Jing Liu, Zhen Zhang, Jinxin Dai |
المصدر: | Environmental Science & Technology. 49:13716-13723 |
بيانات النشر: | American Chemical Society (ACS), 2015. |
سنة النشر: | 2015 |
مصطلحات موضوعية: | Flue gas, Kinetics, chemistry.chemical_element, Coal combustion products, complex mixtures, Arsenic, otorhinolaryngologic diseases, Environmental Chemistry, Coal, Air Pollutants, integumentary system, business.industry, Spectrum Analysis, Temperature, technology, industry, and agriculture, General Chemistry, respiratory tract diseases, chemistry, Fluidized bed, Environmental chemistry, Gases, Inductively coupled plasma, business, Pyrolysis |
الوصف: | The kinetic behavior of arsenic (As) release during coal combustion and pyrolysis in a fluidized bed was investigated by applying an on-line analysis system of trace elements in flue gas. This system, based on inductively coupled plasma optical emission spectroscopy (ICP-OES), was developed to measure trace elements concentrations in flue gas quantitatively and continuously. Obvious variations of arsenic concentration in flue gas were observed during coal combustion and pyrolysis, indicating strong influences of atmosphere and temperature on arsenic release behavior. Kinetic laws governing the arsenic release during coal combustion and pyrolysis were determined based on the results of instantaneous arsenic concentration in flue gas. A second-order kinetic law was determined for arsenic release during coal combustion, and the arsenic release during coal pyrolysis followed a fourth-order kinetic law. The results showed that the arsenic release rate during coal pyrolysis was faster than that during coal combustion. Thermodynamic calculations were carried out to identify the forms of arsenic in vapor and solid phases during coal combustion and pyrolysis, respectively. Ca3(AsO4)2 and Ca(AsO2)2 are the possible species resulting from As-Ca interaction during coal combustion. Ca(AsO2)2 is the most probable species during coal pyrolysis. |
تدمد: | 1520-5851 0013-936X |
الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0dfb41d15125d0440a148849bfca5fdcTest https://doi.org/10.1021/acs.est.5b03626Test |
رقم الانضمام: | edsair.doi.dedup.....0dfb41d15125d0440a148849bfca5fdc |
قاعدة البيانات: | OpenAIRE |
تدمد: | 15205851 0013936X |
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