Coal gasification fine slag(CGFS)is a solid waste generated from entrained-flow coal gasification,characterized by fine particles and rich in silicon and aluminum elements.Using CGFS as a raw material for the preparat...Coal gasification fine slag(CGFS)is a solid waste generated from entrained-flow coal gasification,characterized by fine particles and rich in silicon and aluminum elements.Using CGFS as a raw material for the preparation of ZSM-5 molecular sieves enables the high-value utilization of coal-based solid waste,offering significant economic and environmental benefits.This study proposes a simple and economical hydrothermal synthesis process for ZSM-5 using CGFS as the raw material.In this process,impurities in CGFS were first removed by acid washing,which facilitated the subsequent alkaline extraction of silicon and aluminum species.The extracted Si-Al precursors were then converted into ZSM-5 via hydrothermal crystallization at 170℃for 48 h,yielding a product with a high specific surface area of 358 m2/g.Adsorption experiments demonstrated that the synthesized ZSM-5 exhibited excellent adsorption performance for Pb2+in aqueous solutions.At 25℃,the removal efficiency for a 50 mg/L Pb2+solution reached 83.7%,with an adsorption capacity of 104.625 mg/g under optimized conditions.The adsorption process is mainly governed by chemisorption mechanisms,including surface complexation,precipitation,and ion exchange.The synthesized ZSM-5 shows promising potential for application in the treatment of lead-containing wastewater.展开更多
Solid bitumens were found throughout the carbonate reservoirs in the Puguang gas field, the largest gas field so far found in marine carbonates in China, confirming that the Puguang gas field evolved from a paleo-oil ...Solid bitumens were found throughout the carbonate reservoirs in the Puguang gas field, the largest gas field so far found in marine carbonates in China, confirming that the Puguang gas field evolved from a paleo-oil reservoir. The fluid conduit system at the time of intensive oil accumulation in the field was reconstructed, and petroleum migration pathways were modeled using a 3-D model and traced by geochemical parameters. The forward modeling and inversion tracing coincided with each other and both indicated that oils accumulated in the Puguang-Dongyuezhai structure originated from a generative kitchen to the northwest of the Puguang gas field. The deposition of organic-rich Upper Permian source rocks dominated by sapropelic organic matter in the Northeast Sichuan Basin, the development of fluid conduit system that was vertically near-source rock and laterally near-generative kitchen, and the focusing of oils originated from a large area of the generative kitchen, were the three requirements for the formation of the giant paleo-oil reservoir from which the giant Puguang gas field evolved. The Puguang gas field had experienced a three-stage evolution. The post-accumulation processes, especially the organic-inorganic interaction in the hydrocarbon-water-rock system, had not only profoundly altered the composition and characteristics of the petroleum fluids, but also obviously changed the physicochemical conditions in the reservoir and resulted in complicated precipitation and solution of carbonate minerals.展开更多
Diurnal variations of two mountain-plain solenoid (MPS) circulations associated with "first-step" terrain [Tibetan Plateau (TP)] and "second-step" terrain (high mountains between the TP and "east plains") ...Diurnal variations of two mountain-plain solenoid (MPS) circulations associated with "first-step" terrain [Tibetan Plateau (TP)] and "second-step" terrain (high mountains between the TP and "east plains") in China and their influence on the south west vortex (SWV) and the mei-yu front vortex (MYFV) were investigated via a semi-idealized mesoscale numerical model [Weather Research and Forecasting (WRF)] simulation integrated with ten-day average fields (mei-yu period of 1-10 July 2007). The simulations successfully reproduced two MPS circulations related to first and second-step terrain, diurnal vari- ations from the eastern edge of the TP to the Yangtze River-Huaihe River valleys (YHRV), and two precipitation maximum centers related to the SWV, MYFV. Analyses of the averaged final seven-day simulation showed the different diurnal peaks of precipitation at different regions: from the aftemoon to early evening at the eastern edge of the TP; in the early evening to the next early morning in the Sichuan Basin (SCB); and in the late evening to the next early morning over the mei-yu front (MYF). Analyses of individual two-day cases confirmed that the upward branches of the nightlime MPS circulations enhanced the precipitation over the SWV and the MYFV and revealed that the eastward extension of the SWV and its con vection were conducive to triggering the MYFVs. The eastward propagation of a rainfall streak from the eastern edge of the TP to the eastern coastal region was primarily due to a series of convective activities of several systems from west to east, including the MPS between the TP and SCB, the SWV, the MPS between second-step terrain and tile east plains, and the MYFV.展开更多
基金Supported by the National Natural Science Foundation of China(52200139)the Open Research Fund Program of Engineering Technology Research Center of Coal Resources Comprehensive Utilization,Anhui University of Science and Technology(MTYJZX202203).
摘要Coal gasification fine slag(CGFS)is a solid waste generated from entrained-flow coal gasification,characterized by fine particles and rich in silicon and aluminum elements.Using CGFS as a raw material for the preparation of ZSM-5 molecular sieves enables the high-value utilization of coal-based solid waste,offering significant economic and environmental benefits.This study proposes a simple and economical hydrothermal synthesis process for ZSM-5 using CGFS as the raw material.In this process,impurities in CGFS were first removed by acid washing,which facilitated the subsequent alkaline extraction of silicon and aluminum species.The extracted Si-Al precursors were then converted into ZSM-5 via hydrothermal crystallization at 170℃for 48 h,yielding a product with a high specific surface area of 358 m2/g.Adsorption experiments demonstrated that the synthesized ZSM-5 exhibited excellent adsorption performance for Pb2+in aqueous solutions.At 25℃,the removal efficiency for a 50 mg/L Pb2+solution reached 83.7%,with an adsorption capacity of 104.625 mg/g under optimized conditions.The adsorption process is mainly governed by chemisorption mechanisms,including surface complexation,precipitation,and ion exchange.The synthesized ZSM-5 shows promising potential for application in the treatment of lead-containing wastewater.
基金supported by the"973"Project (2005CB422105)the Program for Changjiang Scholars and Innovative Research Team at the University (PCSIRT IRT0658).
摘要Solid bitumens were found throughout the carbonate reservoirs in the Puguang gas field, the largest gas field so far found in marine carbonates in China, confirming that the Puguang gas field evolved from a paleo-oil reservoir. The fluid conduit system at the time of intensive oil accumulation in the field was reconstructed, and petroleum migration pathways were modeled using a 3-D model and traced by geochemical parameters. The forward modeling and inversion tracing coincided with each other and both indicated that oils accumulated in the Puguang-Dongyuezhai structure originated from a generative kitchen to the northwest of the Puguang gas field. The deposition of organic-rich Upper Permian source rocks dominated by sapropelic organic matter in the Northeast Sichuan Basin, the development of fluid conduit system that was vertically near-source rock and laterally near-generative kitchen, and the focusing of oils originated from a large area of the generative kitchen, were the three requirements for the formation of the giant paleo-oil reservoir from which the giant Puguang gas field evolved. The Puguang gas field had experienced a three-stage evolution. The post-accumulation processes, especially the organic-inorganic interaction in the hydrocarbon-water-rock system, had not only profoundly altered the composition and characteristics of the petroleum fluids, but also obviously changed the physicochemical conditions in the reservoir and resulted in complicated precipitation and solution of carbonate minerals.
基金jointly sponsored by a project of the State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences(Grant No.2011LASWA15)the National Key Basic Research and Development Project of China(Grant No.2012CB417201)the National Natural Science Foundation of China(Grant No.40930951)
摘要Diurnal variations of two mountain-plain solenoid (MPS) circulations associated with "first-step" terrain [Tibetan Plateau (TP)] and "second-step" terrain (high mountains between the TP and "east plains") in China and their influence on the south west vortex (SWV) and the mei-yu front vortex (MYFV) were investigated via a semi-idealized mesoscale numerical model [Weather Research and Forecasting (WRF)] simulation integrated with ten-day average fields (mei-yu period of 1-10 July 2007). The simulations successfully reproduced two MPS circulations related to first and second-step terrain, diurnal vari- ations from the eastern edge of the TP to the Yangtze River-Huaihe River valleys (YHRV), and two precipitation maximum centers related to the SWV, MYFV. Analyses of the averaged final seven-day simulation showed the different diurnal peaks of precipitation at different regions: from the aftemoon to early evening at the eastern edge of the TP; in the early evening to the next early morning in the Sichuan Basin (SCB); and in the late evening to the next early morning over the mei-yu front (MYF). Analyses of individual two-day cases confirmed that the upward branches of the nightlime MPS circulations enhanced the precipitation over the SWV and the MYFV and revealed that the eastward extension of the SWV and its con vection were conducive to triggering the MYFVs. The eastward propagation of a rainfall streak from the eastern edge of the TP to the eastern coastal region was primarily due to a series of convective activities of several systems from west to east, including the MPS between the TP and SCB, the SWV, the MPS between second-step terrain and tile east plains, and the MYFV.