Emission factors of mercury and particulate matters, and in situ control of mercury during the co-combustion of anthracite and dried sawdust sludge
| Autor: | Yuejiang Lu, Runlong Hao, Xingzhou Mao, Yumin Mao, Yi Zhao, Fan Yang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Reaction mechanism
Materials science 020209 energy General Chemical Engineering Organic Chemistry Air pollution Anthracite Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Particulates medicine.disease_cause Combustion Mercury (element) Fuel Technology chemistry X-ray photoelectron spectroscopy visual_art Environmental chemistry 0202 electrical engineering electronic engineering information engineering medicine visual_art.visual_art_medium Sawdust |
| Zdroj: | Fuel. 230:202-210 |
| ISSN: | 0016-2361 |
| DOI: | 10.1016/j.fuel.2018.05.026 |
| Popis: | Anthracite and dried sawdust sludge (DSS) were demonstrated as a complementary combination. Since air pollution has attracted great concern, this paper studies the emission characteristics of mercury and particulate matters (PMs) during the co-combustion process. The results indicated that no Hg2+ was produced in all cases. The Hg0 emission factor decreased significantly with the increasing of DSS. The rising temperature from 800 to 900 °C slightly promoted the Hg0 emission, but the further increasing temperature caused a decreasing of Hg0 emission. Oxygen-enrich atmosphere accelerated the release of Hg0 from anthracite, but the DSS combustion was independent on the atmospheric conditions. The emission factor of PMs for DSS was 10.5 ± 1.7 mg/kg which was 9 times higher than that of anthracite combustion (95.2 ± 7.7 mg/kg). The results of in situ control of Hg0 demonstrated the co-combustion of fuel and Ca-based additives could not deeply reduce Hg0 emission, however the integrated approach of gas phase oxidation combined with wet absorption was satisfactory in terms of Hg0 control, and the way of post-combustion injection was better, the oxidation efficiencies of Hg0 reached 62.5%. The main existing forms of mercury were determined as HgSO4 and HgX2 (X: Br or Cl) by XPS, the reaction mechanism of Hg0 removal was proposed accordingly. |
| Databáze: | OpenAIRE |
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