Lower emission plant using processed low-rank coals

A comparison of acid treatment in the dewatering of Chinese and Australian lignites by mechanical thermal expression at high temperatures

“…Al 2 O 3 and kaolinite are the second most abundant components in LY and SL lignites respectively. The ash content of the LY samples in this study was higher (7.6%) than that of LY samples used by other researches (2%-6%) [4,7,9,22,[26][27][28]. It is possible that the LY samples in this study might have come from a location closer to the inter-seam sediments.…”

“…They reported an increased level of inorganic cation (Na, K, Mg and Ca) in the product water and their concentrations are dependent on the concentration of HCl solutions used. The reduction in the ash content was found to be more apparent in higher temperature treatments using acid washed coal [9,[11][12][13].…”

“…They reported no obvious change in COD in the wastewater from the LY [7], while the COD data for Bowman coal from Australia and Hambach coal from Germany showed an apparent dependence on the concentration of the acid added [7,8]. Domazetis and his co-workers [9] also found that acid treatment could reduce the COD in wastewater in the temperature range of 100-210°C. Murakami and his co-workers [10] also found that the amount of dissociated carboxyl groups in solution decreased gradually with decreasing pH in the range of 2-8.…”

Investigation on the off-design performances of flue gas pre-dried lignite-fired power system integrated with waste heat recovery at variable external working conditions

“…The demands for developing more energy efficient and environmental friendly power systems are heavily driven by the fuel prices and environmental impacts of electricity production [1]. Lignite, well known for abundant resource, sufficient supply and low cost [2], has been generally expected to become a predominant fuel source for power generation.…”

Investigation of the evolved gases from Sulcis coal during pyrolysis under N2 and H2 atmospheres

“…Currently the use of clean coal technologies could allow the processing of a low-grade coal with high efficiency and careful emission control in power plant [2,3].…”