The Experts below are selected from a list of 127449 Experts worldwide ranked by ideXlab platform
Feng Ling - One of the best experts on this subject based on the ideXlab platform.
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Characteristics of rice husk Gasification in an entrained flow reactor.
Bioresource technology, 2009Co-Authors: Yijun Zhao, Shaozeng Sun, Hongming Tian, Juan Qian, Feng LingAbstract:Experiments were performed in an entrained flow reactor to better understand the characteristics of biomass Gasification. Rice husk was used in this study. Effects of the Gasification temperature (700, 800, 900 and 1000 degrees C) and the equivalence ratio in the range of 0.22-0.34 on the biomass Gasification and the axial gas distribution in the reactor were studied. The results showed that reactions of CnHm were less important in the Gasification process except cracking reactions which occurred at higher temperature. In the oxidization zone, reactions between char and oxygen had a more prevailing role. The optimal Gasification temperature of the rice husk could be above 900 degrees C, and the optimal value of ER was 0.25. The Gasification process was finished in 1.42 s when the Gasification temperature was above 800 degrees C. A first order kinetic model was developed for describing rice husk air Gasification characteristics and the relevant kinetic parameters were determined.
Juntao Wei - One of the best experts on this subject based on the ideXlab platform.
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synergy mechanism analysis of petroleum coke and municipal solid waste msw derived hydrochar co Gasification
Applied Energy, 2017Co-Authors: Juntao Wei, Qinghua Guo, Lu Ding, Kunio YoshikawaAbstract:Abstract In this work, the influences of the Gasification temperatures (1000–1150 °C) and blended ratios (3:1, 1:1, 1:3) on the co-Gasification reactivity and synergy of petroleum coke (PC) and municipal solid waste (MSW)-derived hydrochar (HTC) were studied using a thermogravimetric analyzer (TGA). Chemical fractionation analysis (CFA) coupled with an inductively coupled plasma optical emission spectrometer (ICP-OES) was adopted for quantitatively investigating the active alkali/alkaline earth metal (AAEM) transformation (i.e., active AAEM content variation) during co-Gasification in order to correlate the synergy mechanism of co-Gasification. The results indicated that the co-Gasification reactivity of the blended chars was enhanced with increasing Gasification temperatures and HTC char proportions. The variations of the synergy behaviour on co-Gasification reactivity at different conversions showed continuously enhanced synergistic effect at early co-Gasification stage and decreased synergistic effect with further co-Gasification. Moreover, higher Gasification temperatures and HTC char proportions were more favourable for the continuous enhancement of the synergistic effect as co-Gasification conversions increased. The overall synergistic effect on co-Gasification reactivity was more obvious at higher HTC char proportions and lower Gasification temperatures. The relative transformation ratio ( P ) was proposed to characterize the active AAEM content variation during co-Gasification. P was negative when more active AAEM remained in blended chars, meaning that there was inhibition effect on the active AAEM transformation. It was found that the inhibition effect on the active Ca/K transformation was first enhanced and then weakened whereas the promotion effect on the active Na transformation showed an opposite trend with increasing conversion of co-Gasification, which well correlated the synergy behaviour variations during PC-HTC blended char co-Gasification. This work not only revealed synergy mechanism of petroleum coke and MSW-based hydrochar co-Gasification but also provided reference data for the design and operation of industrial Gasification units consuming mixture of petroleum coke and waste biomasses.
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Synergistic effect on co-Gasification reactivity of biomass-petroleum coke blended char
Bioresource Technology, 2017Co-Authors: Juntao Wei, Qinghua Guo, Yan Gong, Lu Ding, Guangsuo YuAbstract:In this work, effects of Gasification temperature (900 °C–1100 °C) and blended ratio (3:1, 1:1, 1:3) on reactivity of petroleum coke and biomass co-Gasification were studied in TGA. Quantification analysis of active AAEM transformation and in situ investigation of morphological structure variations in Gasification were conducted respectively using inductively coupled plasma optical emission spectrometer and heating stage microscope to explore synergistic effect on co-Gasification reactivity. The results indicated that char Gasification reactivity was enhanced with increasing biomass proportion and Gasification temperature. Synergistic effect on co-Gasification reactivity was presented after complete generation of biomass ash, and gradually weakened with increasing temperature from 1000 °C to 1100 °C after reaching the most significant value at 1000 °C. This phenomenon was well related with the appearance of molten biomass ash rich in glassy state potassium and the weakest inhibition effect on active potassium transformation during co-Gasification at the temperature higher than 1000 °C.
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Study on reactivity characteristics and synergy behaviours of rice straw and bituminous coal co-Gasification.
Bioresource technology, 2016Co-Authors: Juntao Wei, Qinghua Guo, Handing Chen, Xueli ChenAbstract:Co-Gasification of rice straw (RS) and Shenfu bituminous coal (SF) was conducted in a thermogravimetric analyzer (TGA) to explore the effects of Gasification temperature and blend ratio on reactivity characteristics and synergy behaviours of co-Gasification. Moreover, the relationship between the synergy and the K/Ca transformation in co-Gasification was studied using flame atomic absorption spectrum (FAAS) and in-situ heating stage microscope. The results showed that the whole reactivities increased with increasing RS proportion and Gasification temperature. The transformation of water-soluble and ion-exchanged (ws-ie) calcium was enhanced in whole co-Gasification and the ws-ie potassium transformation was obviously inhibited in mid-late reaction. Hence, synergy behaviours were synthetically determined by the enhancement of Ca deactivation and the strengthening of K catalysis. The inhibiting effect was occurred in initial co-Gasification and was converted to the synergistic effect at a characteristic conversion, which decreased with increasing RS proportion and decreasing Gasification temperature.
Qinghua Guo - One of the best experts on this subject based on the ideXlab platform.
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synergy mechanism analysis of petroleum coke and municipal solid waste msw derived hydrochar co Gasification
Applied Energy, 2017Co-Authors: Juntao Wei, Qinghua Guo, Lu Ding, Kunio YoshikawaAbstract:Abstract In this work, the influences of the Gasification temperatures (1000–1150 °C) and blended ratios (3:1, 1:1, 1:3) on the co-Gasification reactivity and synergy of petroleum coke (PC) and municipal solid waste (MSW)-derived hydrochar (HTC) were studied using a thermogravimetric analyzer (TGA). Chemical fractionation analysis (CFA) coupled with an inductively coupled plasma optical emission spectrometer (ICP-OES) was adopted for quantitatively investigating the active alkali/alkaline earth metal (AAEM) transformation (i.e., active AAEM content variation) during co-Gasification in order to correlate the synergy mechanism of co-Gasification. The results indicated that the co-Gasification reactivity of the blended chars was enhanced with increasing Gasification temperatures and HTC char proportions. The variations of the synergy behaviour on co-Gasification reactivity at different conversions showed continuously enhanced synergistic effect at early co-Gasification stage and decreased synergistic effect with further co-Gasification. Moreover, higher Gasification temperatures and HTC char proportions were more favourable for the continuous enhancement of the synergistic effect as co-Gasification conversions increased. The overall synergistic effect on co-Gasification reactivity was more obvious at higher HTC char proportions and lower Gasification temperatures. The relative transformation ratio ( P ) was proposed to characterize the active AAEM content variation during co-Gasification. P was negative when more active AAEM remained in blended chars, meaning that there was inhibition effect on the active AAEM transformation. It was found that the inhibition effect on the active Ca/K transformation was first enhanced and then weakened whereas the promotion effect on the active Na transformation showed an opposite trend with increasing conversion of co-Gasification, which well correlated the synergy behaviour variations during PC-HTC blended char co-Gasification. This work not only revealed synergy mechanism of petroleum coke and MSW-based hydrochar co-Gasification but also provided reference data for the design and operation of industrial Gasification units consuming mixture of petroleum coke and waste biomasses.
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Synergistic effect on co-Gasification reactivity of biomass-petroleum coke blended char
Bioresource Technology, 2017Co-Authors: Juntao Wei, Qinghua Guo, Yan Gong, Lu Ding, Guangsuo YuAbstract:In this work, effects of Gasification temperature (900 °C–1100 °C) and blended ratio (3:1, 1:1, 1:3) on reactivity of petroleum coke and biomass co-Gasification were studied in TGA. Quantification analysis of active AAEM transformation and in situ investigation of morphological structure variations in Gasification were conducted respectively using inductively coupled plasma optical emission spectrometer and heating stage microscope to explore synergistic effect on co-Gasification reactivity. The results indicated that char Gasification reactivity was enhanced with increasing biomass proportion and Gasification temperature. Synergistic effect on co-Gasification reactivity was presented after complete generation of biomass ash, and gradually weakened with increasing temperature from 1000 °C to 1100 °C after reaching the most significant value at 1000 °C. This phenomenon was well related with the appearance of molten biomass ash rich in glassy state potassium and the weakest inhibition effect on active potassium transformation during co-Gasification at the temperature higher than 1000 °C.
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Study on reactivity characteristics and synergy behaviours of rice straw and bituminous coal co-Gasification.
Bioresource technology, 2016Co-Authors: Juntao Wei, Qinghua Guo, Handing Chen, Xueli ChenAbstract:Co-Gasification of rice straw (RS) and Shenfu bituminous coal (SF) was conducted in a thermogravimetric analyzer (TGA) to explore the effects of Gasification temperature and blend ratio on reactivity characteristics and synergy behaviours of co-Gasification. Moreover, the relationship between the synergy and the K/Ca transformation in co-Gasification was studied using flame atomic absorption spectrum (FAAS) and in-situ heating stage microscope. The results showed that the whole reactivities increased with increasing RS proportion and Gasification temperature. The transformation of water-soluble and ion-exchanged (ws-ie) calcium was enhanced in whole co-Gasification and the ws-ie potassium transformation was obviously inhibited in mid-late reaction. Hence, synergy behaviours were synthetically determined by the enhancement of Ca deactivation and the strengthening of K catalysis. The inhibiting effect was occurred in initial co-Gasification and was converted to the synergistic effect at a characteristic conversion, which decreased with increasing RS proportion and decreasing Gasification temperature.
Chen Chong - One of the best experts on this subject based on the ideXlab platform.
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CO2 Gasification of Municipal Solid Waste in a Drop-Tube Reactor: Experimental Study and Thermodynamic Analysis of Syngas
Energy & Fuels, 2018Co-Authors: Xiaoyuan Zheng, Zhi Ying, Bo Wang, Chen ChongAbstract:A Gasification-based waste-to-energy technique has been considered as a promising alternative to direct incineration. With the potential benefits of reducing the greenhouse gas emission and producing syngas, CO2 gaisification of municipal solid waste (MSW) was studied in a drop-tube reactor. Process parameters, including the temperature and CO2/MSW mass ratio, were investigated. On the basis of the experimental results, energy and exergy analyses were conducted to evaluate the thermodynamic quality. Results indicated that the temperature had a significant impact on the syngas composition, while the effects of the CO2/MSW mass ratio were not so profound. The tendency of the syngas composition revealed that the Boudouard reaction, water gas reaction, and free radical combination reaction were the most influential reactions in the Gasification process. Energy and exergy analyses showed that the total energy and exergy values of syngas increased with the rising temperature, whereas they declined initially and...
Yijun Zhao - One of the best experts on this subject based on the ideXlab platform.
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Characteristics of rice husk Gasification in an entrained flow reactor.
Bioresource technology, 2009Co-Authors: Yijun Zhao, Shaozeng Sun, Hongming Tian, Juan Qian, Feng LingAbstract:Experiments were performed in an entrained flow reactor to better understand the characteristics of biomass Gasification. Rice husk was used in this study. Effects of the Gasification temperature (700, 800, 900 and 1000 degrees C) and the equivalence ratio in the range of 0.22-0.34 on the biomass Gasification and the axial gas distribution in the reactor were studied. The results showed that reactions of CnHm were less important in the Gasification process except cracking reactions which occurred at higher temperature. In the oxidization zone, reactions between char and oxygen had a more prevailing role. The optimal Gasification temperature of the rice husk could be above 900 degrees C, and the optimal value of ER was 0.25. The Gasification process was finished in 1.42 s when the Gasification temperature was above 800 degrees C. A first order kinetic model was developed for describing rice husk air Gasification characteristics and the relevant kinetic parameters were determined.
