An experimental study of thermal de-NOx using NH3 as reductant in 02/C02 atmosphere with the effect of S02 and different additives was performed in a drop tube furnace. Results show that the optimum temperature win- d...An experimental study of thermal de-NOx using NH3 as reductant in 02/C02 atmosphere with the effect of S02 and different additives was performed in a drop tube furnace. Results show that the optimum temperature win- dow is 841-1184 ℃, and the optimum reaction temperature is about 900 ℃ with a de-NOx efficiency of 95.4%. A certain amount of S02 has an inhibiting effect on NO reduction. The effect of additives, including Na2C03, C2H5OH and FeCI3, on NO reduction by NH3 is also explored. The addition of Na2CO3 and FeCI3 is useful to widen the tem- perature window and shift the reaction to lower temperature for the efficiency is increased from 30.5% to 74.0% and 67.4% respectively at 800 ℃. Qualitatively, the modeling results using a detailed kinetic modeling mecha- nism represent well most of the process features. The effect of Na2CO3, C2H5OH and FeCI3 addition can be reproduced well by the Na2C03, C2H5OH and Fe（CO）5 sub-mechanism respectively. The reaction mechanism analysis shows that the effects of these additives on NO reduction are achieved mainly by promoting the produc- tion of OH radicals at lower temperature.展开更多
Calcium sulfoaluminate,3CaO·3Al2O3·CaSO4,has been widely recognized in the realms of high-temperature combustion and cement chemistry.However,the lack of relevant thermodynamic data limits the progress of it...Calcium sulfoaluminate,3CaO·3Al2O3·CaSO4,has been widely recognized in the realms of high-temperature combustion and cement chemistry.However,the lack of relevant thermodynamic data limits the progress of its research and development.Through comparative calculations using several different approaches,we obtain the thermochemical properties of 3CaO·3Al2O3·CaSO4 in this work,such as its standard formation enthalpy,Gibbs free en- ergy of formation,entropy,and molar heat capacity.With these fundamental data,thermodynamic calculations become possible for reactions involving this mineral.It is found that some reactions proposed in literature to generate this mineral may not proceed thermodynamically.展开更多
The additional anticorrosive coating and hydrophilic layer of glass fiber cloth (GFC) deposited on the carbon steel sheet (CSS) was experimented and the surface wetting characteristic of the hydrophilic modified colle...The additional anticorrosive coating and hydrophilic layer of glass fiber cloth (GFC) deposited on the carbon steel sheet (CSS) was experimented and the surface wetting characteristic of the hydrophilic modified collection electrode was investigated under single strand feed water condition. The distilled water was selected as the working fluid. The influence of Reynolds number on the surface wetting characteristic parameters and those parameters at different temperatures were specifically studied. The results indicate that the GFC surface with loose glass fiber bundles reveals remarkable surface wetting characterizations. The saturated liquid holdup of this surface is 8 - 10 times more than that of the CSS surface;the surface flowrate value is 6 - 8 percent of that of the CSS surface;the film rate of this surface is 28 - 32 times more than that of the CSS surface;the average film thickness is between a third and a half of the value of the CSS surface. Good agreement is achieved between the WESPs working temperature and the experimental temperature range with remarkable wetting characterizations that provides a theoretical basis for the industrial application. Not satisfactorily, the hydrophilic modification surface is not able to survive high temperature.展开更多
The effective treatment of volatile organic compounds(VOCs)is essential because of their direct effects on air pollution and human health.This paper introduces microwave-induced metal discharge as a highly effective a...The effective treatment of volatile organic compounds(VOCs)is essential because of their direct effects on air pollution and human health.This paper introduces microwave-induced metal discharge as a highly effective and byproduct value-added approach to degrade high-concentration toluene as a model VOC.The effect of the factors that influence the discharge intensity,including the metal type(Fe,Cu,Ni,Zn)and amount,was investigated.Degradation efficiency of toluene can reach 79.76% under optimal discharge condition.In addition,the discharge method was compared with traditional thermal destruction at 700℃,900℃ and 1100℃.The gaseous and liquid cracking products of toluene produced by the microwave-induced metal discharge method were almost similar to those obtained under thermal destruction at 900℃;however,the solid-phase discharge products were nanoparticles that demonstrated good graphitization,while the thermal destruction products were amorphous microparticles.This work offers an effective and flexible way to degrade high-concentration VOCs and also provides an application reference for biomass tar cracking and removal of other organic pollutants.展开更多
基金Supported by the National Natural Science Foundation of China(51206096)
文摘An experimental study of thermal de-NOx using NH3 as reductant in 02/C02 atmosphere with the effect of S02 and different additives was performed in a drop tube furnace. Results show that the optimum temperature win- dow is 841-1184 ℃, and the optimum reaction temperature is about 900 ℃ with a de-NOx efficiency of 95.4%. A certain amount of S02 has an inhibiting effect on NO reduction. The effect of additives, including Na2C03, C2H5OH and FeCI3, on NO reduction by NH3 is also explored. The addition of Na2CO3 and FeCI3 is useful to widen the tem- perature window and shift the reaction to lower temperature for the efficiency is increased from 30.5% to 74.0% and 67.4% respectively at 800 ℃. Qualitatively, the modeling results using a detailed kinetic modeling mecha- nism represent well most of the process features. The effect of Na2CO3, C2H5OH and FeCI3 addition can be reproduced well by the Na2C03, C2H5OH and Fe（CO）5 sub-mechanism respectively. The reaction mechanism analysis shows that the effects of these additives on NO reduction are achieved mainly by promoting the produc- tion of OH radicals at lower temperature.
基金Supported by the National Natural Science Foundation of China(50906046)the National High-Tech Research and Development Program of China(2009AA05Z303)the Program for New Century Excellent Talents in University(NCET-10-0529)
文摘Calcium sulfoaluminate,3CaO·3Al2O3·CaSO4,has been widely recognized in the realms of high-temperature combustion and cement chemistry.However,the lack of relevant thermodynamic data limits the progress of its research and development.Through comparative calculations using several different approaches,we obtain the thermochemical properties of 3CaO·3Al2O3·CaSO4 in this work,such as its standard formation enthalpy,Gibbs free en- ergy of formation,entropy,and molar heat capacity.With these fundamental data,thermodynamic calculations become possible for reactions involving this mineral.It is found that some reactions proposed in literature to generate this mineral may not proceed thermodynamically.
文摘The additional anticorrosive coating and hydrophilic layer of glass fiber cloth (GFC) deposited on the carbon steel sheet (CSS) was experimented and the surface wetting characteristic of the hydrophilic modified collection electrode was investigated under single strand feed water condition. The distilled water was selected as the working fluid. The influence of Reynolds number on the surface wetting characteristic parameters and those parameters at different temperatures were specifically studied. The results indicate that the GFC surface with loose glass fiber bundles reveals remarkable surface wetting characterizations. The saturated liquid holdup of this surface is 8 - 10 times more than that of the CSS surface;the surface flowrate value is 6 - 8 percent of that of the CSS surface;the film rate of this surface is 28 - 32 times more than that of the CSS surface;the average film thickness is between a third and a half of the value of the CSS surface. Good agreement is achieved between the WESPs working temperature and the experimental temperature range with remarkable wetting characterizations that provides a theoretical basis for the industrial application. Not satisfactorily, the hydrophilic modification surface is not able to survive high temperature.
基金supported by the National Key Research and Development Program of China(Grant No.2018YFB0605200)Natural Science Foundation of China(Grant No.51976110)+2 种基金Young Scholars Program of Shandong University(Grant No.2018WLJH75)Fundamental Research Funds of Shandong University(Grant No.2017GN009)Natural Science Foundation of Shandong Province(Grant No.ZR2019MEE035).
文摘The effective treatment of volatile organic compounds(VOCs)is essential because of their direct effects on air pollution and human health.This paper introduces microwave-induced metal discharge as a highly effective and byproduct value-added approach to degrade high-concentration toluene as a model VOC.The effect of the factors that influence the discharge intensity,including the metal type(Fe,Cu,Ni,Zn)and amount,was investigated.Degradation efficiency of toluene can reach 79.76% under optimal discharge condition.In addition,the discharge method was compared with traditional thermal destruction at 700℃,900℃ and 1100℃.The gaseous and liquid cracking products of toluene produced by the microwave-induced metal discharge method were almost similar to those obtained under thermal destruction at 900℃;however,the solid-phase discharge products were nanoparticles that demonstrated good graphitization,while the thermal destruction products were amorphous microparticles.This work offers an effective and flexible way to degrade high-concentration VOCs and also provides an application reference for biomass tar cracking and removal of other organic pollutants.
