The harmful solids and nano-particles with particle size smaller than or equal to 10 mm can be hardly removed by means of the existing solideliquid separation.And on drilling sites,they are mostly buried after a harml...The harmful solids and nano-particles with particle size smaller than or equal to 10 mm can be hardly removed by means of the existing solideliquid separation.And on drilling sites,they are mostly buried after a harmless treatment,but the resource utilization ratio is low and the risk of secondary pollution still exists.In this paper,a technical idea was proposed to carry out a reclamation treatment on the waste water-based drilling fluids by means of electrochemical adsorption.Firstly,a laboratory test was carried out to investigate the effects of voltage,adsorption time,bentonite concentration,pad spacing and inorganic salt concentration on electro adsorption results by applying voltage on electro adsorption electrode.Then,the adsorption capacity of 4 common inorganic salts(NaCl,KCl,CaCl_(2)and Na_(2)CO_(3))to the solid particles in the simulated drilling fluid was investigated on the electro adsorption electrode at different concentrations.Finally,after an optimal electro adsorption condition was determined,the waste polysulfonate drilling fluid of a certain domestic oilfield was taken as a sample to verify such treatment effect.And the following research results were obtained.First,by means of electrochemical adsorption,the inferior solid particles in waste drilling fluids are removed through adsorption,and thus the waste drilling fluid is reclaimed and the resource reutilization ratio of drilling waste is increased while its treatment volume and cost in the late stage is decreased.Second,the optimal electro adsorption condition of simulated waste drilling fluid with 5%bentonite and 2 g/L NaCl is adsorption voltage of 36 V,adsorption time of 5 min and pad spacing of 5 cm.And third,more than 90%of the inferior solids with a particle size range of 1e10 mm are removed after the sample is treated by means of the electrochemical adsorption.It is indicated that this proposed method plays a remarkable role in removing the inferior solids in the waste polysulfonate drilling fluids.展开更多
Due to the complexity of influence factors in the nanoparticles adsorption method and the limitation of data samples, the support vector machine （SVM） was used in the prediction method for the drag reduction effect....Due to the complexity of influence factors in the nanoparticles adsorption method and the limitation of data samples, the support vector machine （SVM） was used in the prediction method for the drag reduction effect. The basic concept of SVM was introduced, and the e - SVR programming for the kemel function on the radial basis was established firstly with the help of the MATLAB software. Then, an analysis was made for the influencing factors of the drag reduction effect in nanoparticles adsorption. Finally, a prediction model for the drag reduction effect of nanoparticles was established, and the accuracy of training sample and prediction sample was analyzed. The result shows that the SVM has good availability and can be used as a rapid evaluation method of the drag reduction effect prediction of nanoparticles adsorption method.展开更多
Based on experiment results and theoretical analysis,pointed out that the method of coal susceptibility to spontaneous combustion determination with fluid oxygen adsorption can not present the essence of coal oxidatio...Based on experiment results and theoretical analysis,pointed out that the method of coal susceptibility to spontaneous combustion determination with fluid oxygen adsorption can not present the essence of coal oxidation process and oxidation reaction. The method is incorrect,paying attention at one aspect and ignoring the rest.The method is not reasonable for coal susceptibility to spontaneous combustion determination.Sus- ceptibility to spontaneous combustion of coal reflects chemical property of coal oxidation with oxygen absorption and heat release at low temperature.Coal's susceptibility to spon- taneous combustion is mainly decided by the number of molecules with reaction activation energy and activation molecule production rate at certain temperature.Therefore,index of susceptibility to spontaneous combustion should adopt accumulative value or trend of heat release or oxygen adsorption during oxidation process.展开更多
An amended method for accurate measuring the quantity of calcium silicate hydrate(C-S-H) in pure cement paste and blended cement paste by water adsorption was made, which based on R.A.Olson’s method. Two improvements...An amended method for accurate measuring the quantity of calcium silicate hydrate(C-S-H) in pure cement paste and blended cement paste by water adsorption was made, which based on R.A.Olson’s method. Two improvements to this method, such as using C-S-H gel by hydro-thermal synthesis as standard sample and the stoichiometry of C-S-H gel is partitioned based on hydration time and the amount of mineral admixture. The result of C-S-H gel content in pure cement paste and blended cement paste is higher than by R.A.Olson’s method.展开更多
ZnO/graphene oxide（ZnO/GO） composite material,in which ZnO nanoparticles were densely coated on the GO nanosheets,was successfully prepared by an improved two-step method and characterized by IR, XRD,TEM,and UV-vis ...ZnO/graphene oxide（ZnO/GO） composite material,in which ZnO nanoparticles were densely coated on the GO nanosheets,was successfully prepared by an improved two-step method and characterized by IR, XRD,TEM,and UV-vis techniques.The improved photocatalytic property of the ZnO/GO composite material,evaluated by the photocatalytic degradation of methyl orange（MO） under UV irradiation,is ascribed to the intimate contact between ZnO and GO,the enhanced adsorption of MO,the quick electron transfer from excited ZnO particles to GO sheets and the activation of MO molecules viaπ-πinteraction between MO and GO.展开更多
Adsorption of FCC dry gas components, hydrogen(H_2), nitrogen(N_2), methane(CH_4), ethane(C_2H_6) and ethylene(C_2H_4) in zeolite Y was studied by performing the Grant Canonical Monte Carlo(GCMC) simulations at 298K a...Adsorption of FCC dry gas components, hydrogen(H_2), nitrogen(N_2), methane(CH_4), ethane(C_2H_6) and ethylene(C_2H_4) in zeolite Y was studied by performing the Grant Canonical Monte Carlo(GCMC) simulations at 298K and 823K and under a pressure range up to 10 MPa. Simulation results were analyzed using the Langmuir model, which presented fitting of dry gas components adsorption to be suggested as the monolayer adsorption. C_2H_4 presented most single adsorption amount, which reached 7.63 mol/kg at 298K under a pressure of 200kPa. Thermodynamic parameters of the Gibbs free energy change, enthalpy change and entropy change were analyzed based on adsorption equilibrium constant obtained from the GCMC simulations. The results suggested that it was more favorable for C_2H_4 to be adsorbed in zeolite Y. Adsorption molecules were in ordered arrangement in the zeolite, and C_2H_4 exhibited a more orderly arrangement than other components. Additionally, a competition in the adsorption of a mixture of dry gas components was found, and supercages were the priority adsorption space. The competition was favorable to CH_4 and C_2H_6, and the competitive power was affected by temperature.展开更多
This paper presents a comprehensive overview of various advanced technologies employed in the treatment of volatile organic compounds(VOCs),which are crucial pollutants in industrial emissions.The study explores diffe...This paper presents a comprehensive overview of various advanced technologies employed in the treatment of volatile organic compounds(VOCs),which are crucial pollutants in industrial emissions.The study explores different methods,including direct combustion,thermal combustion,catalytic combustion,low-temperature plasma purification,photocatalytic purification,membrane separation,and adsorption methods.Each technology is critically analyzed for its operational principles,efficiency,and applicability under different conditions.Special attention is given to adsorption concentration and catalytic combustion parallel method,highlighting its efficiency in treating low-concentration,high-volume VOC emissions.The paper also delves into the advantages and limitations of each method,providing insights into their effectiveness in various industrial scenarios.The study aims to offer a detailed guide for selecting appropriate VOC treatment technologies,contributing to enhanced environmental protection and sustainable industrial practices.展开更多
基金supported by the National Major Science and Technology Project“Waste Disposal and Utilization”(No.2016ZX05040)PetroChina Low Carbon Major Science and Technology Project“Water-based Drilling Waste Utilization and Recycling Technology Research and Demonstration Application”(No.:2016E-1203)CNPC Development Strategy and Science and Technology Foundation Decision Support Research Project of“Research on New Methods of HSE Experiment”(No.2016D-5006-08).
文摘The harmful solids and nano-particles with particle size smaller than or equal to 10 mm can be hardly removed by means of the existing solideliquid separation.And on drilling sites,they are mostly buried after a harmless treatment,but the resource utilization ratio is low and the risk of secondary pollution still exists.In this paper,a technical idea was proposed to carry out a reclamation treatment on the waste water-based drilling fluids by means of electrochemical adsorption.Firstly,a laboratory test was carried out to investigate the effects of voltage,adsorption time,bentonite concentration,pad spacing and inorganic salt concentration on electro adsorption results by applying voltage on electro adsorption electrode.Then,the adsorption capacity of 4 common inorganic salts(NaCl,KCl,CaCl_(2)and Na_(2)CO_(3))to the solid particles in the simulated drilling fluid was investigated on the electro adsorption electrode at different concentrations.Finally,after an optimal electro adsorption condition was determined,the waste polysulfonate drilling fluid of a certain domestic oilfield was taken as a sample to verify such treatment effect.And the following research results were obtained.First,by means of electrochemical adsorption,the inferior solid particles in waste drilling fluids are removed through adsorption,and thus the waste drilling fluid is reclaimed and the resource reutilization ratio of drilling waste is increased while its treatment volume and cost in the late stage is decreased.Second,the optimal electro adsorption condition of simulated waste drilling fluid with 5%bentonite and 2 g/L NaCl is adsorption voltage of 36 V,adsorption time of 5 min and pad spacing of 5 cm.And third,more than 90%of the inferior solids with a particle size range of 1e10 mm are removed after the sample is treated by means of the electrochemical adsorption.It is indicated that this proposed method plays a remarkable role in removing the inferior solids in the waste polysulfonate drilling fluids.
基金supported by the National Natural Science Foundation of China(Grant No.50874071)the Chinese National Programs for High Technology Research and Development(Grant No.SS2013AA061104)+1 种基金Shanghai Program for Innovative Research Team in Universities,Shanghai Leading Academic Discipline Project(Grant No.S30106)the Shanghai Leading Talents Project and the Key Program of Science and Technology Commission of Shanghai Municipality(Grant No.12160500200)
文摘Due to the complexity of influence factors in the nanoparticles adsorption method and the limitation of data samples, the support vector machine （SVM） was used in the prediction method for the drag reduction effect. The basic concept of SVM was introduced, and the e - SVR programming for the kemel function on the radial basis was established firstly with the help of the MATLAB software. Then, an analysis was made for the influencing factors of the drag reduction effect in nanoparticles adsorption. Finally, a prediction model for the drag reduction effect of nanoparticles was established, and the accuracy of training sample and prediction sample was analyzed. The result shows that the SVM has good availability and can be used as a rapid evaluation method of the drag reduction effect prediction of nanoparticles adsorption method.
基金Innovative Team in Science and Technology of Arthui Province College and Universities(2006KJ005TD)Science of Fire,Nature Science Foundation of China(2001 CB409600)
文摘Based on experiment results and theoretical analysis,pointed out that the method of coal susceptibility to spontaneous combustion determination with fluid oxygen adsorption can not present the essence of coal oxidation process and oxidation reaction. The method is incorrect,paying attention at one aspect and ignoring the rest.The method is not reasonable for coal susceptibility to spontaneous combustion determination.Sus- ceptibility to spontaneous combustion of coal reflects chemical property of coal oxidation with oxygen absorption and heat release at low temperature.Coal's susceptibility to spon- taneous combustion is mainly decided by the number of molecules with reaction activation energy and activation molecule production rate at certain temperature.Therefore,index of susceptibility to spontaneous combustion should adopt accumulative value or trend of heat release or oxygen adsorption during oxidation process.
基金Funded by the Ministry of Science and Technology of the People's Republic of China (No. 2001CD610704-2) Wuhan City Chenguan Plan (No. 20055003059231)
文摘An amended method for accurate measuring the quantity of calcium silicate hydrate(C-S-H) in pure cement paste and blended cement paste by water adsorption was made, which based on R.A.Olson’s method. Two improvements to this method, such as using C-S-H gel by hydro-thermal synthesis as standard sample and the stoichiometry of C-S-H gel is partitioned based on hydration time and the amount of mineral admixture. The result of C-S-H gel content in pure cement paste and blended cement paste is higher than by R.A.Olson’s method.
基金supported by the Natural Science Foundation of China(No.21174114)the Ministry of Education Plan for Yangtze River Scholar and Innovation Team Development(No.IRT1177)+2 种基金Scientific and Technical Plan Project of Gansu Province(No. 1204GKCA006)the Natural Science Foundation of Gansu Province (No.1010RJZA024)Scientific and Technical Innovation Project of Northwest Normal University(No.nwnu-kjcxgc-03-63)
文摘ZnO/graphene oxide（ZnO/GO） composite material,in which ZnO nanoparticles were densely coated on the GO nanosheets,was successfully prepared by an improved two-step method and characterized by IR, XRD,TEM,and UV-vis techniques.The improved photocatalytic property of the ZnO/GO composite material,evaluated by the photocatalytic degradation of methyl orange（MO） under UV irradiation,is ascribed to the intimate contact between ZnO and GO,the enhanced adsorption of MO,the quick electron transfer from excited ZnO particles to GO sheets and the activation of MO molecules viaπ-πinteraction between MO and GO.
基金financial support from the National Natural Science Foundation of China (No. 41302101 and No. 21476263)
文摘Adsorption of FCC dry gas components, hydrogen(H_2), nitrogen(N_2), methane(CH_4), ethane(C_2H_6) and ethylene(C_2H_4) in zeolite Y was studied by performing the Grant Canonical Monte Carlo(GCMC) simulations at 298K and 823K and under a pressure range up to 10 MPa. Simulation results were analyzed using the Langmuir model, which presented fitting of dry gas components adsorption to be suggested as the monolayer adsorption. C_2H_4 presented most single adsorption amount, which reached 7.63 mol/kg at 298K under a pressure of 200kPa. Thermodynamic parameters of the Gibbs free energy change, enthalpy change and entropy change were analyzed based on adsorption equilibrium constant obtained from the GCMC simulations. The results suggested that it was more favorable for C_2H_4 to be adsorbed in zeolite Y. Adsorption molecules were in ordered arrangement in the zeolite, and C_2H_4 exhibited a more orderly arrangement than other components. Additionally, a competition in the adsorption of a mixture of dry gas components was found, and supercages were the priority adsorption space. The competition was favorable to CH_4 and C_2H_6, and the competitive power was affected by temperature.
文摘This paper presents a comprehensive overview of various advanced technologies employed in the treatment of volatile organic compounds(VOCs),which are crucial pollutants in industrial emissions.The study explores different methods,including direct combustion,thermal combustion,catalytic combustion,low-temperature plasma purification,photocatalytic purification,membrane separation,and adsorption methods.Each technology is critically analyzed for its operational principles,efficiency,and applicability under different conditions.Special attention is given to adsorption concentration and catalytic combustion parallel method,highlighting its efficiency in treating low-concentration,high-volume VOC emissions.The paper also delves into the advantages and limitations of each method,providing insights into their effectiveness in various industrial scenarios.The study aims to offer a detailed guide for selecting appropriate VOC treatment technologies,contributing to enhanced environmental protection and sustainable industrial practices.
