Conversion of methane by steam reforming was carried out by means of dielectric-barrier discharge.A systemic procedure was employed to determine the suitable experimental conditions.It was found that one of the plasma...Conversion of methane by steam reforming was carried out by means of dielectric-barrier discharge.A systemic procedure was employed to determine the suitable experimental conditions.It was found that one of the plasma generators can match the system best.A higher power input can always bring a higher conversion,but the selectivity to C2H6 decreased from 52.48% to 39.43% as the power increased from 20W to 49W.When discharge distance was 4mm,selectivities to almost all main products reached the max.The inner electrode made of stainless steel and the outer electrode with aluminum foil were one of the best options which can obviously enhance the conversion of methane.A larger flow rate always resulted in a lower conversion of methane.In the most time,19.93% steam promoted conversion of methane.展开更多
Coupling of methane in the present of hydrogen to C 2 hydrocarbons operated at atmospheric pressure in order to evaluate a newly-developed plasma reactor with rotating poly tip electrodes, in which circular glow disch...Coupling of methane in the present of hydrogen to C 2 hydrocarbons operated at atmospheric pressure in order to evaluate a newly-developed plasma reactor with rotating poly tip electrodes, in which circular glow discharge plasma zone between a stator and a rotor with poly tip electrodes is vertical to the way of the stream of flowing reactants. No substantial amount of carbon formation was observed on the surface of the electrodes after a long period of the reaction(>1 h) when the molar ratio of feed flow of CH 4∶H 2 is 1∶1 and the A.C. glow discharge at 20 kHz, input power of 856 V(rms). C 2 hydrocarbons single pass yield is 42.6%, in which C 2H 2 38.9% and C 2H 4 3.5% respectively, with 62.3% methane conversion but with carbon formation when input power is 1010 V(rms).展开更多
Methane coupling to produce C2 hydrocar-bons through a dielectric-barrier discharge(DBD)plasma reaction was studied in four DBD reactors.The effects of high voltage electrode position,different discharge gap,types of ...Methane coupling to produce C2 hydrocar-bons through a dielectric-barrier discharge(DBD)plasma reaction was studied in four DBD reactors.The effects of high voltage electrode position,different discharge gap,types of inner electrode,volume ratio of hydrogen to methane and air cooling method on the conversion of methane and distribution of products were investigated.Conversion of methane is obviously lower when a high voltage electrode acts as an outer electrode than when it acts as an inner electrode.The lifting of reaction temper-ature becomes slow due to cooling of outer electrode and the temperature can be controlled in the expected range of 60℃-150℃for ensuring better methane conversion and safe operation.The parameters of reactors have obvious effects on methane conversion,but it only slightly affects distribution of the products.The main products are ethyl-ene,ethane and propane.The selectivity of C2 hydrocar-bons can reach 74.50%when volume ratio of hydrogen to methane is 1.50.展开更多
Based on spontaneous desorption characteristic, the correlation of desorption time and gas content was analyzed and the application of it in production was researched. The desorption of high rank coalbed methane in Qi...Based on spontaneous desorption characteristic, the correlation of desorption time and gas content was analyzed and the application of it in production was researched. The desorption of high rank coalbed methane in Qinshui basin was periodic, and isotope fractionation effect also exists in the process. △δ^13C1 can be used to distinguish the stabilization of coalbed methane wells, associated with desorption rate, the individual well recoverable reserves can be calculated. Economically recoverable time can be predicted according to the logarithmic relationship between desorption gas content per ton and desorption time. The error between predicted result and numerical simulation result is only 1.5%.展开更多
The research results of processes proceeding in supersonic jets of light hydrocarbons, activated by an electron beam are presented. It is shown, that condensation suppressed at activation by electrons in the initial s...The research results of processes proceeding in supersonic jets of light hydrocarbons, activated by an electron beam are presented. It is shown, that condensation suppressed at activation by electrons in the initial stage of condensation. The developed condensation conditions mode leads to increasing of a part of heavy corpuscles in activated stream and not only owing to stimulation of condensation but because of formation of heavy hydrocarbonic molecules.展开更多
Production of CH4 has been established using a low-pressure square-pulse cross-field CO2/H2 discharge with magnetic field. The conversion rate from CO2 to CH4 was investigated by changing the discharge parameters such...Production of CH4 has been established using a low-pressure square-pulse cross-field CO2/H2 discharge with magnetic field. The conversion rate from CO2 to CH4 was investigated by changing the discharge parameters such as applied power and discharge distance, together with magnetic field strength. Carbon dioxide was reduced by hydrogen. The discharge took place across the magnetic field inside a glass tube. Decomposition of CO2 and CH4 selectivity are found to be dependent on power density. Energy efficiency for methane production is increased in a narrow discharge. Preferable improvements of CO2 decomposition, CH4 selectivity, and energy efficiency were established.展开更多
The branch structure of corona discharge has been investigated via C2H2 corona discharge. Carbon filament with excellent branch structure is formed in the discharge. This carbon filament offers a direct mimic of the b...The branch structure of corona discharge has been investigated via C2H2 corona discharge. Carbon filament with excellent branch structure is formed in the discharge. This carbon filament offers a direct mimic of the branch structure of corona discharge. It provides a very useful way to study on the average energy, physical and chemical characteristics of corona discharge. On this basis, the chemical property of corona discharge for methane conversion is discussed.展开更多
基金Supported by the National iqatural Science Foundation of China （20606023, 20490203）.
文摘Conversion of methane by steam reforming was carried out by means of dielectric-barrier discharge.A systemic procedure was employed to determine the suitable experimental conditions.It was found that one of the plasma generators can match the system best.A higher power input can always bring a higher conversion,but the selectivity to C2H6 decreased from 52.48% to 39.43% as the power increased from 20W to 49W.When discharge distance was 4mm,selectivities to almost all main products reached the max.The inner electrode made of stainless steel and the outer electrode with aluminum foil were one of the best options which can obviously enhance the conversion of methane.A larger flow rate always resulted in a lower conversion of methane.In the most time,19.93% steam promoted conversion of methane.
文摘Coupling of methane in the present of hydrogen to C 2 hydrocarbons operated at atmospheric pressure in order to evaluate a newly-developed plasma reactor with rotating poly tip electrodes, in which circular glow discharge plasma zone between a stator and a rotor with poly tip electrodes is vertical to the way of the stream of flowing reactants. No substantial amount of carbon formation was observed on the surface of the electrodes after a long period of the reaction(>1 h) when the molar ratio of feed flow of CH 4∶H 2 is 1∶1 and the A.C. glow discharge at 20 kHz, input power of 856 V(rms). C 2 hydrocarbons single pass yield is 42.6%, in which C 2H 2 38.9% and C 2H 4 3.5% respectively, with 62.3% methane conversion but with carbon formation when input power is 1010 V(rms).
基金supported by the National Natural Science Foundation of China(Grant No.20606023)the National Key Natural Science Foundation of China(No.20490203).
文摘Methane coupling to produce C2 hydrocar-bons through a dielectric-barrier discharge(DBD)plasma reaction was studied in four DBD reactors.The effects of high voltage electrode position,different discharge gap,types of inner electrode,volume ratio of hydrogen to methane and air cooling method on the conversion of methane and distribution of products were investigated.Conversion of methane is obviously lower when a high voltage electrode acts as an outer electrode than when it acts as an inner electrode.The lifting of reaction temper-ature becomes slow due to cooling of outer electrode and the temperature can be controlled in the expected range of 60℃-150℃for ensuring better methane conversion and safe operation.The parameters of reactors have obvious effects on methane conversion,but it only slightly affects distribution of the products.The main products are ethyl-ene,ethane and propane.The selectivity of C2 hydrocar-bons can reach 74.50%when volume ratio of hydrogen to methane is 1.50.
文摘Based on spontaneous desorption characteristic, the correlation of desorption time and gas content was analyzed and the application of it in production was researched. The desorption of high rank coalbed methane in Qinshui basin was periodic, and isotope fractionation effect also exists in the process. △δ^13C1 can be used to distinguish the stabilization of coalbed methane wells, associated with desorption rate, the individual well recoverable reserves can be calculated. Economically recoverable time can be predicted according to the logarithmic relationship between desorption gas content per ton and desorption time. The error between predicted result and numerical simulation result is only 1.5%.
文摘The research results of processes proceeding in supersonic jets of light hydrocarbons, activated by an electron beam are presented. It is shown, that condensation suppressed at activation by electrons in the initial stage of condensation. The developed condensation conditions mode leads to increasing of a part of heavy corpuscles in activated stream and not only owing to stimulation of condensation but because of formation of heavy hydrocarbonic molecules.
文摘Production of CH4 has been established using a low-pressure square-pulse cross-field CO2/H2 discharge with magnetic field. The conversion rate from CO2 to CH4 was investigated by changing the discharge parameters such as applied power and discharge distance, together with magnetic field strength. Carbon dioxide was reduced by hydrogen. The discharge took place across the magnetic field inside a glass tube. Decomposition of CO2 and CH4 selectivity are found to be dependent on power density. Energy efficiency for methane production is increased in a narrow discharge. Preferable improvements of CO2 decomposition, CH4 selectivity, and energy efficiency were established.
文摘The branch structure of corona discharge has been investigated via C2H2 corona discharge. Carbon filament with excellent branch structure is formed in the discharge. This carbon filament offers a direct mimic of the branch structure of corona discharge. It provides a very useful way to study on the average energy, physical and chemical characteristics of corona discharge. On this basis, the chemical property of corona discharge for methane conversion is discussed.
