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.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/acs.est.5b03626 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Current level, sources, and risk of human exposure to PAHs, PBDEs and PCBs in South American outdoor air: A critical review.
Environ Res
January 2025
Institute of Science and Technology, São Paulo State University (UNESP), Av. Três de Março, 511, Alto da Boa Vista, 18087-180 Sorocaba, SP, Brazil. Electronic address:
This study provides comprehensive overview of the current level, sources and human exposure risk to hazardous polycyclic aromatic hydrocarbons (PAHs), polybrominated diphenyl ethers (PBDEs), and polychlorinated biphenyls (PCBs) in South American outdoor air. Research documents were obtainable for only 6 countries within the target period (2014 - 2024). For all contaminants, urban concentrations exceeded that of rural/remote locations.
View Article and Find Full Text PDFCharacteristics and analysis of PM2.5 particles in a light-polluted atmosphere in winter.
Sci Rep
January 2025
Yili Prefecture Product Quality Institute, Yining, 835000, China.
To study the micro-morphological characteristics of PM2.5 and its effect on ambient air quality, a 7500F scanning electron microscope (SEM) was utilized in this study to examine the micromorphology and elemental composition of PM2.5 and its impact on ambient air quality during heavily polluted weather in Yining City in the winter of 2018-2019.
View Article and Find Full Text PDFStudy on the reforming performance of liquid products from biomass staged gasification based on component analysis and simulation.
Bioresour Technol
January 2025
Hubei Key Laboratory of Hydroelectric Machinery Design & Maintenance, China Three Gorges University, Yichang 443002, PR China. Electronic address:
Biomass staged gasification technology (BSGT) divides the traditional gasification into medium-temperature devolatilization (MTD) stage, high-temperature gasification (HTG) stage and high-temperature reforming (HTR) stage. The present study conducted MTD and HTG experiments on corn stalks and focused on the effect of MTD at 200-550 °C on the reforming performance of BSGT liquid products through component analysis and simulation. The results demonstrate that the MTD temperature above 350 °C could prevent the participation of phenols and oxygen in HTG and HTR stages, respectively, thereby improving the reforming performance of BSGT liquid products and the quality of BSGT syngas.
View Article and Find Full Text PDFQuantification of Fugitive Carbon Emissions from Uncontrolled Combustion in Coal Fire Area: the Sandaoba Coalfield, Xinjiang, China.
Environ Res
January 2025
China Academy of Safety Science and Technology, Beijing 100012, China. Electronic address:
Spontaneous coal fires are a significant source of greenhouse gas emissions, contributing to global warming. However, the lack of reliable estimation methods and research has obscured the full environmental impact of these emissions. This paper presents a novel quantification method for fugitive carbon emissions from spontaneous coal combustion.
View Article and Find Full Text PDFInsight into nitrogen transformation during the binary NaOH-NaCO molten salt thermal treatment of waste tires.
Waste Manag
January 2025
State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
Molten salt thermal treatment of solid waste is a promising way for energy recovery and pollutant removal. However, the migration of nitrogen during pyrolysis of waste tires poses a challenge for cleaner production. This study investigated nitrogen conversion pathways during waste tires pyrolysis using a binary NaOH-NaCO salt at 425, 500, and 575 °C.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!