Effect of temperature on the sintering behavior of Zhundong coal ash in oxy-fuel combustion atmosphere》.pdf

Fuel 150 (2015) 526–537 Contents lists available at ScienceDirect Fuel journal homepage: www.else /locate/fuel Effect of temperature on the sintering behavior of Zhundong coal ash in oxy-fuel combustion atmosphere Bin Zhou, Hao Zhou ⇑, Jianyang Wang, Kefa Cen Zhejiang University, Institute for Thermal Power Engineering, State Key Laboratory of Clean Energy Utilization, Hangzhou 310027, PR China h i g h l i g h t s Digital image technique was used to monitor the morphology of sintered ash samples under oxy-fuel combustion atmosphere. The change in height and area of sintered ash samples with time was obtained through image processing system. Layer structure of the sintered samples with different colors was analyzed. Mineralogy, chemical compositions, and microstructure of layer structure of sintered samples were analyzed. a r t i c l e i n f o a b s t r a c t Article history: This paper was addressed to evaluate the sintering behavior of coal ash at different temperatures under Received 5 September 2014 oxy-fuel combustion (O2/CO2 combustion) atmosphere. A lignite (Zhundong coal) characterized by high Received in revised form 12 February 2015 sodium level has been applied as the fuel material. The raw ash was heat treated at four different tem- Accepted 13 February 2015 peratures: 1350, 1300, 1250, and 1200 C, respectively. In addition, two atmospheres has been applied to Available online 26 February 2015 as the reaction atmosphere: (1) 30 vol.% O