The Experts below are selected from a list of 1812 Experts worldwide ranked by ideXlab platform
Yitian Fang - One of the best experts on this subject based on the ideXlab platform.
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adjustment behaviors of Blending Coal on the ash fusion characteristics of Coal with a high ash fusion temperature
Journal of Thermal Analysis and Calorimetry, 2016Co-Authors: Yitian FangAbstract:To explore the effects of Blending Coal on the ash fusion temperature (AFT) of Coal with a high AFT, Yima Coal (YM) and Shenmu Coal (SM) were added to Jincheng anthracite (JC) in different mass ratios. The variation in ash fusion characteristics was investigated on ash fusion analyzer. X-ray fluorescence spectrometer, X-ray diffracto-meter combined with Rietveld-based SIROQUANT software package and scanning electron microscopy were used to explore the adjustment mechanism of Blending Coal on the AFTs. Both Blending Coal can make the JC AFTs decrease to some extent. For YM, the AFT of the mixture decreased smoothly; however, for SM, the mixture AFT initially decreased smoothly (SM: 0–20 %), then sharply (SM: 20–30 %) and gradually again. The increase of low MP matter (anorthite, hercynite) content results in the AFT decrease of JC mixed ashes. Gehlenite formation due to high content of calcium oxide in SM makes the AFT variation in JC mixed ashes for two Blending Coals is difference. Compared to YM, the gehlenite could react with hercynite and quartz to generate glassy material, which made mixed JC decrease markedly when SM mass ratio increased from 20 to 30 %.
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minimum and terminal velocity in fluidization of Coal gasification materials and Coal Blending of gasification under pressure
Fuel, 2013Co-Authors: Junguo Li, Zhonghu Cheng, Yitian Fang, Hongyu Wang, Jiejie Huang, Yang WangAbstract:Abstract Fluidization plays an important role in the chemical process of fluidized bed Coal gasification. Experiments have been conducted with gasifier discharge of pilot plant and industrial demonstration plant to investigate fluidization fundamentals on the condition that pressures up to 2.5 MPa and nitrogen as the fluidizing gas. Both a three-dimensional bed (60-mm-i.d.) and a two-dimensional bed (30 × 300 mm) are used in the experiments. The fundamentals of high pressure fluidization examined in this study include minimum fluidization velocity, terminal (entrainment) velocity and jetting bubbling behavior. Several simplified correlations derived from the Ergun equation were investigated for determining minimum fluidization velocity. The effects of pressure upon entrainment velocity and flexibility were analyzed. Jetting bubble and Coal Blending were also studied over a range of pressures. Experimental results indicate that the diameter of Coal should be decreased in the process of Blending Coal with increasing pressure.
Jun Han - One of the best experts on this subject based on the ideXlab platform.
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a model for predicting arsenic volatilization during Coal combustion based on the ash fusion temperature and Coal characteristic
Energies, 2021Co-Authors: Bo Zhao, Geng Chen, Zijiang Xiong, Linbo Qin, Wangsheng Chen, Jun HanAbstract:Arsenic emission from Coal combustion power plants has attracted increasing attention due to its high toxicity. In this study, it was found that there was a close relationship between the ash fusion temperature (AFT) and arsenic distribution based on the thermodynamic equilibrium calculation. In addition to the AFT, Coal characteristics and combustion temperature also considerably affected the distribution and morphology of arsenic during Coal combustion. Thus, an arsenic volatilization model based on the AFT, Coal type, and combustion temperature during Coal combustion was developed. To test the accuracy of the model, Blending Coal combustion experiments were carried out. The experimental results and published data proved that the developed arsenic volatilization model can accurately predict arsenic emission during co-combustion, and the errors of the predicted value for bituminous and lignite were 2.3–9.8%, with the exception of JingLong (JL) Coal when combusted at 1500 °C.
Bo Zhao - One of the best experts on this subject based on the ideXlab platform.
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a model for predicting arsenic volatilization during Coal combustion based on the ash fusion temperature and Coal characteristic
Energies, 2021Co-Authors: Bo Zhao, Geng Chen, Zijiang Xiong, Linbo Qin, Wangsheng Chen, Jun HanAbstract:Arsenic emission from Coal combustion power plants has attracted increasing attention due to its high toxicity. In this study, it was found that there was a close relationship between the ash fusion temperature (AFT) and arsenic distribution based on the thermodynamic equilibrium calculation. In addition to the AFT, Coal characteristics and combustion temperature also considerably affected the distribution and morphology of arsenic during Coal combustion. Thus, an arsenic volatilization model based on the AFT, Coal type, and combustion temperature during Coal combustion was developed. To test the accuracy of the model, Blending Coal combustion experiments were carried out. The experimental results and published data proved that the developed arsenic volatilization model can accurately predict arsenic emission during co-combustion, and the errors of the predicted value for bituminous and lignite were 2.3–9.8%, with the exception of JingLong (JL) Coal when combusted at 1500 °C.
Zhongbing Dong - One of the best experts on this subject based on the ideXlab platform.
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effect of Coal Blending on the leaching characteristics of arsenic in fly ash from fluidized bed Coal combustion
Fuel Processing Technology, 2013Co-Authors: Facun Jiao, Yoshihiko Ninomiya, Lian Zhang, Naoomo Yamada, Atsushi Sato, Zhongbing DongAbstract:The leaching characteristics of arsenic (As) in fly ash collected from lab-scale fluidized bed reactor have been systematically investigated through the combustion of two bituminous Coals (A and B) and their mixture with different Blending ratio. Leaching tests were conducted according to Japanese Industrial Standard (JIS).The results indicate that, the fly ash derived from the combustion of Coal B, which contains abundant calcium, shows a larger capture ability for arsenic vapor than that from Coal A, due to the chemical reaction of arsenic with CaO. This reaction is however competed by the sulfation of CaO at Coal combustion temperature, therefore, a nonlinear increase was observed with increasing the Blending ratios of high-calcium Coal B with Coal A. Leaching performance of arsenic from fly ash is largely dependent on the finally pH of the leachate. CaO in fly ash preferentially generates a high-pH leachate during leaching test and subsequently promotes the combination of calcium with arsenic to form precipitate. Improving Ca/S ratio through the combustion of Blending Coal is a promising method to prevent the emission of arsenic into ambient and reduce its leachability from fly ash.
Zijiang Xiong - One of the best experts on this subject based on the ideXlab platform.
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a model for predicting arsenic volatilization during Coal combustion based on the ash fusion temperature and Coal characteristic
Energies, 2021Co-Authors: Bo Zhao, Geng Chen, Zijiang Xiong, Linbo Qin, Wangsheng Chen, Jun HanAbstract:Arsenic emission from Coal combustion power plants has attracted increasing attention due to its high toxicity. In this study, it was found that there was a close relationship between the ash fusion temperature (AFT) and arsenic distribution based on the thermodynamic equilibrium calculation. In addition to the AFT, Coal characteristics and combustion temperature also considerably affected the distribution and morphology of arsenic during Coal combustion. Thus, an arsenic volatilization model based on the AFT, Coal type, and combustion temperature during Coal combustion was developed. To test the accuracy of the model, Blending Coal combustion experiments were carried out. The experimental results and published data proved that the developed arsenic volatilization model can accurately predict arsenic emission during co-combustion, and the errors of the predicted value for bituminous and lignite were 2.3–9.8%, with the exception of JingLong (JL) Coal when combusted at 1500 °C.