Drying operations are of grave importance to realize the reduction and utilization of sewage sludge resources,but the conventional thermal evaporation drying(TED)technology presents challenges due to the need for a la...Drying operations are of grave importance to realize the reduction and utilization of sewage sludge resources,but the conventional thermal evaporation drying(TED)technology presents challenges due to the need for a large amount of thermal energy to conquer the phase-change latent heat of moisture.Herein,we report a non-phase change technology based on particle high-speed self-rotation in a cyclone for fast,low-temperature drying of viscous sludge with high-moisture contents.Dispersed phase medium(DPM)is introduced into the cyclone self-rotation drying(CSRD)reactor to enhance the dispersion of the viscous sludge.The effects of carrier gas temperature,feeding rate,size,and proportion of DPM particles in the drying process are systematically examined.Under optimal operating conditions,the weighted content of moisture in the viscous sludge could be reduced from 80%to 15.01%in less than 5 s,achieving a high drying efficiency of 95.79%.Theoretical calculations also reveal that 89.26%of the moisture is removed through non-phase change pathway,contributing to a 522-fold increase in the drying rate of CSRD compared to TED technology.This investigation presents a sustainable effective approach for high moisture viscous sludge treatment with low energy consumption and carbon emissions.展开更多
The acidic gases such as SO2,NOx,H2 S and CO2 are typical harmful pollutants and greenhouse gases in the atmosphere,which are also the main sources of PM2.5.The most widely used method of treating these gas molecules ...The acidic gases such as SO2,NOx,H2 S and CO2 are typical harmful pollutants and greenhouse gases in the atmosphere,which are also the main sources of PM2.5.The most widely used method of treating these gas molecules is to capture them with different adsorption materials,i.e.,metal and nonmetallic materials such as MnO2,MoS2 and carbon-based materials.And doping transition metal atoms in adsorption materials are beneficial to the gas adsorption process.The first-principles calculation is a powerful tool for studying the adsorption properties of contaminant molecules on different materials at the molecular and atomic levels to understand surface adsorption reactions,adsorption reactivity,and structureactivity relationships which can provide theoretical guidance for laboratory researches and industrial applications.This review introduces the adsorption models and surface properties of these gas molecules on metal and nonmetallic surfaces by first-principles calculation in recent years.The purpose of this review is to provide the theoretical guidance for experimental research and industrial application,and to inspire scientists to benefit from first-principles calculation for applying similar methods in future work.展开更多
基金supported by the National Key Research and Development Program of China(2019YFA0705800)the National Natural Science Foundation of China(52030001)the Science&Technology Commission of Shanghai Municipality(20dz1207600).
文摘Drying operations are of grave importance to realize the reduction and utilization of sewage sludge resources,but the conventional thermal evaporation drying(TED)technology presents challenges due to the need for a large amount of thermal energy to conquer the phase-change latent heat of moisture.Herein,we report a non-phase change technology based on particle high-speed self-rotation in a cyclone for fast,low-temperature drying of viscous sludge with high-moisture contents.Dispersed phase medium(DPM)is introduced into the cyclone self-rotation drying(CSRD)reactor to enhance the dispersion of the viscous sludge.The effects of carrier gas temperature,feeding rate,size,and proportion of DPM particles in the drying process are systematically examined.Under optimal operating conditions,the weighted content of moisture in the viscous sludge could be reduced from 80%to 15.01%in less than 5 s,achieving a high drying efficiency of 95.79%.Theoretical calculations also reveal that 89.26%of the moisture is removed through non-phase change pathway,contributing to a 522-fold increase in the drying rate of CSRD compared to TED technology.This investigation presents a sustainable effective approach for high moisture viscous sludge treatment with low energy consumption and carbon emissions.
基金supported by the National Nature Science Foundation of China(No.51778383)Sichuan Science and Technology Program(No.2019YFS0500)
文摘The acidic gases such as SO2,NOx,H2 S and CO2 are typical harmful pollutants and greenhouse gases in the atmosphere,which are also the main sources of PM2.5.The most widely used method of treating these gas molecules is to capture them with different adsorption materials,i.e.,metal and nonmetallic materials such as MnO2,MoS2 and carbon-based materials.And doping transition metal atoms in adsorption materials are beneficial to the gas adsorption process.The first-principles calculation is a powerful tool for studying the adsorption properties of contaminant molecules on different materials at the molecular and atomic levels to understand surface adsorption reactions,adsorption reactivity,and structureactivity relationships which can provide theoretical guidance for laboratory researches and industrial applications.This review introduces the adsorption models and surface properties of these gas molecules on metal and nonmetallic surfaces by first-principles calculation in recent years.The purpose of this review is to provide the theoretical guidance for experimental research and industrial application,and to inspire scientists to benefit from first-principles calculation for applying similar methods in future work.
