Journal
FUEL
Volume 212, Issue -, Pages 498-505Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2017.10.081
Keywords
Zhundong coal; Sodium; Alkali metal; Sorbent additives; LIBS
Categories
Funding
- National Natural Science Foundation of China [51422605, 51621005]
- Fundamental Research Funds for the Central Universities [2016QNA4013]
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The retention performance of 5 different sorbent additives, including 2 pure additives, i.e., silica and alumina, and 3 typical natural mineral additives, i.e., kaolin, mica and pyrophyllite, on the release of sodium during the combustion of Zhundong coal is investigated via a combination of online multi-point Laser-Induced Breakdown Spectroscopy (LIBS) technique and offline measurements including inductively coupled plasma atomic emission spectrometer (ICP-AES), X-ray diffraction, and ash fusion temperatures (AFTs). The online and offline measurement results for the sodium release of Zhundong coal/additives mixtures are compared and verified with each other. Ternary phase diagram simulations are performed to further substantiate the impact of different additives on liquidus temperatures of Zhundong coal ash. All the five sorbent additives show a significant sodium retention effect, while alumina and kaolin are better additives considering the effects on AFTs.
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