Improving the efficiency of CaO-based sorbent by SrCO 3 for high-temperature sulfur removal during coal combustion

Green Processing and Synthesis

article

Yanhong Gao¹  Yanhua Yang¹  Guangjun Zhu¹  Nengyun Deng¹ 

[1] School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology

关键词: calcium-based sorbent;    calcium sulphoaluminate;    efficiency;    SrCO3;   

DOI  :  10.1515/gps-2016-0118

来源: De Gruyter

【 摘 要 】

With the goal of adding the appropriate amount of SrCO 3 to coal, the synergistic effects of SrCO 3 and desulfurization agents were studied by using a sulfur determination device and a carbon–sulfur spectrometer. Mineral constituents were investigated with an XRD diffraction analyzer. Results show that, at a given temperature, desulfurization efficiency increased in varying degrees based on the proportion of added SrCO 3 . An increasing amount of calcium sulphoaluminates also appeared in the ash residue. Meanwhile, SrCO 3 , sulfur capture capacity improved when the temperature reached 1200°C because of the large amount of generated calcium sulphoaluminates (3CaO·3Al 2 O 3 ·CaSO 4 ) and the controlled decomposition of CaSO 4 . At temperatures of 1200°C–1300°C, the ascending rate of the sulfur-fixing ratio decreased due to the sharp decomposition of CaSO 4 and the pyrolysis of a small amount of calcium sulphoaluminate. From 1300°C, the decomposition of increasing amounts of calcium sulphoaluminate gradually worsened the desulfurization. The diffraction peak of calcium sulphoaluminate was the strongest at 1300°C and the sulfur-fixing ratio was also the largest. Therefore, calcium sulphoaluminate reached the highest level at this temperature.

【 授权许可】

CC BY