Study on Co-combustion Kinetics of Oil Shale Sludge and Semicoke
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- 作者：Hong Qin ; Yaokui Yue ; Lidong Zhang ; Yunyu Liu ; Mingshu Chi ; Hongpeng Liu ; Qing Wang ; Bin Liu
- 刊名：Energy & Fuels
- 出版年：2016
- 出版时间：March 17, 2016
- 年：2016
- 卷：30
- 期：3
- 页码：2373-2384
- 全文大小：819K
- ISSN：1520-5029
文摘
Experiments on combustion of oil shale sludge and semicoke were conducted on TG-FTIR to investigate the mechanism of co-combustion involved. The synergy effect of sludge and semicoke was estimated by using the interaction coefficient and the relative error of mean square root. In addition, the activation energy was calculated by means of Coats–Redfern, DAEM, FWO, and Starink. The results show that the whole process contains three stages: light components combustion (130–350 °C), heavy components and volatiles co-combustion (350–650 °C), and fixed carbon combustion (650–750 °C). During the combustion, synergy behaves differently with variation of mixing proportion in mixture and heating rates. DTG curves of mixtures can be decomposed into five Gaussian fitting peaks, respectively corresponding to five independent parallel reactions. From the results of Coats–Redfern, one can see that the kinetic triplets are related to mixture proportion, combustion stage, and heating rate. In addtion, the results of DAEM, FWO, and Starink indicate the three above are fit for calculating kinetic parameters of mixture and also suggest that combustion of mixture is a multiple reaction. It can be noted that there is a positive relationship between release rate of flue gas and proportion of sludge. Besides, the nonlinearity between ACO/ACO2 and the proportion of sludge indicates that an overlarge proportion of sludge is disadvantageous for sufficient burning. According to the combustion characteristics, the kinetic analysis, synergy, and FTIR analysis of flue gas, the optimal blending ratio is 20%/80% of sludge/semicoke.