Papers by Author: Zhong Bing Dong

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Authors: Qiao Liu, Han Xu Li, Zhong Bing Dong
Abstract: The petroleum coke (refered to as PC) with the addition of FeSO4 was obtained by impregnation method, and the reactivity of PC with CO2 are analysed by TG.PC samples were heated from room temperature to 1300 °C with heating rate of 20 °C / min at the atmosphere of CO2 (40 ml/min) and N2 (60 ml/min).At the same time, FTIR spectral of the gasflowing was obtained every 30 seconds. The results show that the TG curve of raw petroleum coke begin to decline, and the CO peak in its 3D infrared spectrogram plot has appeared at the temperature of 1100°C, which proved that the raw petroluem coke (refered to as RPC) has reacted with CO2 at 1100°C. And as the FeSO4 added amount increased,the gasification beginning temperature and initial release time of CO are all in advance,which prove that FeSO4 can enhance the reactivity of PC carbon dioxide gasification.
832
Authors: Ming Jun Ji, Yoshihiko Ninomiya, Zhong Bing Dong, Qun Ying Wang
Abstract: Two chinese bituminous coals used in coal-fired power plants are combusted under air conditions in a lab-scale drop tube furnace. The effects of minerals transformation on the formation of PM 2.5 are investigated during the combustion of coal blends. The collected PM were subjected to Computer controlled scanning electron microscopy (CCSEM) and High-resolution transmission electron microscopy(HRTEM) coupled with energy dispersive X-ray spectroscopy (EDX) analysis for determination of chemical species within them. The results show that PM 2.5 emissions are not linearly related to the wt.% of the parent coal or coal blends. Transformations of fine Si-Al mineral grains provided by the minerals in coal XQ into coarse particles (>2.5 μm in diameter) are responsible for the reduction of PM1-2.5 during the combustion of coal blending. The transformed fine Si-Al particles are captured by the coarse Ca-Mg-Al-Si provided by the minerals in coal HT to form larger Ca-Mg-Al-Si particles (>2.5 μm in diameter). Increasing Ca and Mg concentration in coal blends enhances the liquid concentration produced during combustion and hence affects the emissions of PM1 and PM1-2.5.Through adjusting the mineral compositions in coal blends, the reduction of PM1 and PM1-2.5 emissions can be achieved during combustion.
1306
Authors: Xing Ming Wang, Zhong Bing Dong, Gui Jiang Liu, Jing Liang Mei, Jie Yao
Abstract: Samples of water were collected from the subsidence pools around the coal waste rock piles and some toxic trace elements were determined. The results conclused as the mean concentrations of As, Zn and Pb ranged from 4.71E-03 to 1.78E-02, 9.22E-03 to 2.13E-02, 1.69E-03 to 5.43E-03, respectively, which were lower than the first level of surface water environment quality standards established in China. The mean concentrations of Cd and Cu ranged from 3.30E-04 to 1.25E-03, 1.04E-02 to1.85E-02, respectively, which were within the range of the second level. As the HQs of As, Zn, Pb, Cd, Cu were less than 1, suggesting minimal noncarcinogenic risk to human health. Only As was evaluated with potential carcinogenic risks of 3.17E-04 and 2.02E-04 (>10-4) in the water of subsidence pools around Panyi and Guqiao coal waste rock piles via oral consumption, indicating that As had potential adverse effects on local residents in these two sites. This study is to investigate the contamination levels of trace elements and to estimate the risk to health effects in the water of the subsidence pools in Huainan.
2021
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