The Experts below are selected from a list of 35904 Experts worldwide ranked by ideXlab platform
Peng Dong - One of the best experts on this subject based on the ideXlab platform.
-
characteristics of Rice Husk char gasification with steam
Fuel, 2015Co-Authors: Ming Zhai, Yu Zhang, Peng DongAbstract:Abstract Biomass char gasification with steam refers to the reaction of the steam and biomass char under high temperature when the biomass char converts to combustible gas. Rice Husk was selected as the raw material for char preparation. A gasification reactor was designed and built for the study of characteristics of Rice Husk char gasification with steam. Results show that the temperature is the primary factor that influences the steam gasification reaction of Rice Husk char. The conversion rate increases significantly from 27.7% to 90.73% with the temperature from 700 to 950 °C. H 2 accounts for 46.9% of the product gas at 950 °C. The conversion rate of Rice Husk char increases with temperature. The conversion rate of Rice Husk char increases as the steam flow rate. H 2 and CO gradually increase while CO 2 and CH 4 decrease as the steam flow rate. The conversion rate can be increased by decreasing particle size at low temperature, but the influence of the particle size becomes smaller above 900 °C. The reactivity of Rice Husk char prepared at low temperature is relatively high. Both surface reaction controlled shrinking core reaction model and homogeneous reaction model can describe the steam gasification reaction of Rice Husk char when the temperature is less than 850 °C. However, when the temperature is more than 850 °C, the diffusion through gas controls the overall reaction.
-
Characteristics of Rice Husk tar secondary thermal cracking
Energy, 2015Co-Authors: Ming Zhai, Xinyu Wang, Yu Zhang, Peng Dong, Yudong HuangAbstract:A two-stage fixed bed pyrolysis system for Rice Husk tar high-temperature thermal cracking was designed. Pyrolysis of Rice Husk and high-temperature thermal cracking of the Rice Husk tar were separated. High-temperature flue gas was used to promote Rice Husk pyrolysis, and then high-temperature secondary thermal cracking tar started in the high-temperature environment. The characteristics of secondary thermal cracking of Rice Husk tar were investigated. Results show that Rice Husk tar yield is 18 mg/kg of dry Rice Husk, or 11.7 mg/Nm3 at 1200 °C, and no tar is collected at 1300 °C. At the temperature of 1200 °C and residence time of 0.5 s, the rate of decline of tar reaches the maximum. The oxy-organics content in the tar at 700 °C reaches the maximum 24.5% and becomes zero at 1100 °C. The naphthalene content in the tar reaches the maximum 26.4% at 800 °C. With the increase in temperature, all the tar converts into non-condensable gas and char finally.
-
Characteristics of Rice Husk tar pyrolysis by external flue gas
International Journal of Hydrogen Energy, 2015Co-Authors: Ming Zhai, Xinyu Wang, Yu Zhang, Peng DongAbstract:Abstract Biomass tar is a major problem in both pyrolysis and gasification of biomass. Considering the process and conditions of tar formation, an external flue gas pyrolysis system for Rice Husk tar pyrolysis was designed. The characteristics of Rice Husk tar pyrolysis by external flue gas were investigated. The GC–MS analysis was applied to analyze the composition of Rice Husk tar and its distillate. TGA was carried out to investigate the properties of Rice Husk tar and its distillate. Results show that when the temperature is below 500 °C, the liquid product of Rice Husk pyrolysis is Rice Husk oil; when the temperature reaches about 700 °C, PAHs increase significantly and the liquid product is tar; when the temperature reaches 800 °C, a large amount of charcoal liquid is produced. There are many similarities between Rice Husk tar and its distillate. After distillation, the content of the primary compounds like naphthalene, anthracene, phenol and its derivative increases, while the content of fluorene and phenanthrene decreases. Temperature plays an active role in the pyrolysis of Rice Husk oil and tar, and the proportion of compounds in the pyrolysis product. The weight loss of Rice Husk tar distillate can be divided into three regions, and it reaches a maximum at about 160 °C. The experimental data provide a reference to the optimization of the operating conditions for Rice Husk pyrolysis and tar cracking.
Ming Zhai - One of the best experts on this subject based on the ideXlab platform.
-
characteristics of Rice Husk char gasification with steam
Fuel, 2015Co-Authors: Ming Zhai, Yu Zhang, Peng DongAbstract:Abstract Biomass char gasification with steam refers to the reaction of the steam and biomass char under high temperature when the biomass char converts to combustible gas. Rice Husk was selected as the raw material for char preparation. A gasification reactor was designed and built for the study of characteristics of Rice Husk char gasification with steam. Results show that the temperature is the primary factor that influences the steam gasification reaction of Rice Husk char. The conversion rate increases significantly from 27.7% to 90.73% with the temperature from 700 to 950 °C. H 2 accounts for 46.9% of the product gas at 950 °C. The conversion rate of Rice Husk char increases with temperature. The conversion rate of Rice Husk char increases as the steam flow rate. H 2 and CO gradually increase while CO 2 and CH 4 decrease as the steam flow rate. The conversion rate can be increased by decreasing particle size at low temperature, but the influence of the particle size becomes smaller above 900 °C. The reactivity of Rice Husk char prepared at low temperature is relatively high. Both surface reaction controlled shrinking core reaction model and homogeneous reaction model can describe the steam gasification reaction of Rice Husk char when the temperature is less than 850 °C. However, when the temperature is more than 850 °C, the diffusion through gas controls the overall reaction.
-
Characteristics of Rice Husk tar secondary thermal cracking
Energy, 2015Co-Authors: Ming Zhai, Xinyu Wang, Yu Zhang, Peng Dong, Yudong HuangAbstract:A two-stage fixed bed pyrolysis system for Rice Husk tar high-temperature thermal cracking was designed. Pyrolysis of Rice Husk and high-temperature thermal cracking of the Rice Husk tar were separated. High-temperature flue gas was used to promote Rice Husk pyrolysis, and then high-temperature secondary thermal cracking tar started in the high-temperature environment. The characteristics of secondary thermal cracking of Rice Husk tar were investigated. Results show that Rice Husk tar yield is 18 mg/kg of dry Rice Husk, or 11.7 mg/Nm3 at 1200 °C, and no tar is collected at 1300 °C. At the temperature of 1200 °C and residence time of 0.5 s, the rate of decline of tar reaches the maximum. The oxy-organics content in the tar at 700 °C reaches the maximum 24.5% and becomes zero at 1100 °C. The naphthalene content in the tar reaches the maximum 26.4% at 800 °C. With the increase in temperature, all the tar converts into non-condensable gas and char finally.
-
Characteristics of Rice Husk tar pyrolysis by external flue gas
International Journal of Hydrogen Energy, 2015Co-Authors: Ming Zhai, Xinyu Wang, Yu Zhang, Peng DongAbstract:Abstract Biomass tar is a major problem in both pyrolysis and gasification of biomass. Considering the process and conditions of tar formation, an external flue gas pyrolysis system for Rice Husk tar pyrolysis was designed. The characteristics of Rice Husk tar pyrolysis by external flue gas were investigated. The GC–MS analysis was applied to analyze the composition of Rice Husk tar and its distillate. TGA was carried out to investigate the properties of Rice Husk tar and its distillate. Results show that when the temperature is below 500 °C, the liquid product of Rice Husk pyrolysis is Rice Husk oil; when the temperature reaches about 700 °C, PAHs increase significantly and the liquid product is tar; when the temperature reaches 800 °C, a large amount of charcoal liquid is produced. There are many similarities between Rice Husk tar and its distillate. After distillation, the content of the primary compounds like naphthalene, anthracene, phenol and its derivative increases, while the content of fluorene and phenanthrene decreases. Temperature plays an active role in the pyrolysis of Rice Husk oil and tar, and the proportion of compounds in the pyrolysis product. The weight loss of Rice Husk tar distillate can be divided into three regions, and it reaches a maximum at about 160 °C. The experimental data provide a reference to the optimization of the operating conditions for Rice Husk pyrolysis and tar cracking.
Yu Zhang - One of the best experts on this subject based on the ideXlab platform.
-
characteristics of Rice Husk char gasification with steam
Fuel, 2015Co-Authors: Ming Zhai, Yu Zhang, Peng DongAbstract:Abstract Biomass char gasification with steam refers to the reaction of the steam and biomass char under high temperature when the biomass char converts to combustible gas. Rice Husk was selected as the raw material for char preparation. A gasification reactor was designed and built for the study of characteristics of Rice Husk char gasification with steam. Results show that the temperature is the primary factor that influences the steam gasification reaction of Rice Husk char. The conversion rate increases significantly from 27.7% to 90.73% with the temperature from 700 to 950 °C. H 2 accounts for 46.9% of the product gas at 950 °C. The conversion rate of Rice Husk char increases with temperature. The conversion rate of Rice Husk char increases as the steam flow rate. H 2 and CO gradually increase while CO 2 and CH 4 decrease as the steam flow rate. The conversion rate can be increased by decreasing particle size at low temperature, but the influence of the particle size becomes smaller above 900 °C. The reactivity of Rice Husk char prepared at low temperature is relatively high. Both surface reaction controlled shrinking core reaction model and homogeneous reaction model can describe the steam gasification reaction of Rice Husk char when the temperature is less than 850 °C. However, when the temperature is more than 850 °C, the diffusion through gas controls the overall reaction.
-
Characteristics of Rice Husk tar secondary thermal cracking
Energy, 2015Co-Authors: Ming Zhai, Xinyu Wang, Yu Zhang, Peng Dong, Yudong HuangAbstract:A two-stage fixed bed pyrolysis system for Rice Husk tar high-temperature thermal cracking was designed. Pyrolysis of Rice Husk and high-temperature thermal cracking of the Rice Husk tar were separated. High-temperature flue gas was used to promote Rice Husk pyrolysis, and then high-temperature secondary thermal cracking tar started in the high-temperature environment. The characteristics of secondary thermal cracking of Rice Husk tar were investigated. Results show that Rice Husk tar yield is 18 mg/kg of dry Rice Husk, or 11.7 mg/Nm3 at 1200 °C, and no tar is collected at 1300 °C. At the temperature of 1200 °C and residence time of 0.5 s, the rate of decline of tar reaches the maximum. The oxy-organics content in the tar at 700 °C reaches the maximum 24.5% and becomes zero at 1100 °C. The naphthalene content in the tar reaches the maximum 26.4% at 800 °C. With the increase in temperature, all the tar converts into non-condensable gas and char finally.
-
Characteristics of Rice Husk tar pyrolysis by external flue gas
International Journal of Hydrogen Energy, 2015Co-Authors: Ming Zhai, Xinyu Wang, Yu Zhang, Peng DongAbstract:Abstract Biomass tar is a major problem in both pyrolysis and gasification of biomass. Considering the process and conditions of tar formation, an external flue gas pyrolysis system for Rice Husk tar pyrolysis was designed. The characteristics of Rice Husk tar pyrolysis by external flue gas were investigated. The GC–MS analysis was applied to analyze the composition of Rice Husk tar and its distillate. TGA was carried out to investigate the properties of Rice Husk tar and its distillate. Results show that when the temperature is below 500 °C, the liquid product of Rice Husk pyrolysis is Rice Husk oil; when the temperature reaches about 700 °C, PAHs increase significantly and the liquid product is tar; when the temperature reaches 800 °C, a large amount of charcoal liquid is produced. There are many similarities between Rice Husk tar and its distillate. After distillation, the content of the primary compounds like naphthalene, anthracene, phenol and its derivative increases, while the content of fluorene and phenanthrene decreases. Temperature plays an active role in the pyrolysis of Rice Husk oil and tar, and the proportion of compounds in the pyrolysis product. The weight loss of Rice Husk tar distillate can be divided into three regions, and it reaches a maximum at about 160 °C. The experimental data provide a reference to the optimization of the operating conditions for Rice Husk pyrolysis and tar cracking.
Sang Jun Yoon - One of the best experts on this subject based on the ideXlab platform.
-
Flow Behavior and Mixing Characteristics of Rice Husk/Silica Sand/Rice Husk Ash
Korean Chemical Engineering Research, 2016Co-Authors: Bo Hwa Kim, Sang Jun Yoon, Myung Won Seo, Jin Woo Kook, Hee Mang Choi, Tae Young Mun, Yong Ku Kim, Jae Goo Lee, Young Woo RheeAbstract:We investigate fluidization characteristics of the mixture of Rice Husk, silica sand and Rice Husk ash as a preliminary study for valuable utilization of Rice Husk ash obtained from gasification of Rice Husk in a fluidized bed reactor. As experiment valuables, the blending ratio of Rice Husk and sand (Rice Husk: sand) is selected as 5:95, 10:90, 20:80 and 30:70 on a volume base. Rice Husk ash was added with 6 vol% of Rice Husk for each experiment and air velocity to the reactor was 0~0.63 m/s. In both Rice Husk/sand and Rice Husk/sand/ash mixture, the minimum fluidization velocity (Umf) is observed as 0.19~0.21 m/s at feeding of 0~10 vol.% of Rice Husk and 0.30 m/s at feeding of 20 vol.% of Rice Husk. With increasing the amount of Rice Husk up to 30 vol.%, can not measure due to segregation behavior. The mixing index for each experiment is determined using mixing index equation proposed by Brereton and Grace. The mixing index of the mixture of Rice Husk/sand and Rice Husk/sand/ash was 0.8~1 and 0.88~1, respectively. The optimum fluidization condition was found for the good mixing and separation of Rice Husk ash.
-
gasification and power generation characteristics of Rice Husk and Rice Husk pellet using a downdraft fixed bed gasifier
Renewable Energy, 2012Co-Authors: Sang Jun YoonAbstract:In the present study, gasification of Rice Husk and Rice Husk pellet was performed in a bench-scale downdraft fixed-bed gasifier. Gasification was conducted in a temperature range of 600–850 °C, fuel feeding rate of 40–60 kg/h and gasification agent, air, feeding rate of 50–75 Nm3/h. From the results, synthetic gas heating value and cold gas efficiency of more than 1300 kcal/Nm3 and 70% were achieved, respectively. The heating value of synthetic gas and cold gas efficiency from Rice Husk pellet gasification shows higher value than that of Rice Husk gasification. To make power generation, the CD800L reciprocating engine designed to basically use LPG fuel was conducted by supplying synthetic gas produced from Rice Husk pellet gasification. It was confirmed that stable power generation of 10 kW was achieved.
Shuichi Sugita - One of the best experts on this subject based on the ideXlab platform.
-
adsorption of lead and mercury by Rice Husk ash
Journal of Colloid and Interface Science, 2004Co-Authors: Qingge Feng, Fuzhong Gong, Shuichi Sugita, Masami ShoyaAbstract:An attempt at the use of Rice Husk ash, an agricultural waste, as an adsorbent for the adsorption of lead and mercury from aqueous water is studied. Studies are carried out as a function of contact times, ionic strength, particle size, and pH. Rice Husk ash is found to be a suitable adsorbent for the adsorption of lead and mercury ions. The Bangham equation can be used to express the mechanism for adsorption of lead and mercury ions by Rice Husk ash. Its adsorption capability and adsorption rate are considerably higher and faster for lead ions than for mercury ions. The finer the Rice Husk ash particles used, the higher the pH of the solution and the lower the concentration of the supporting electrolyte, potassium nitrate solution, the more lead and mercury ions absorbed on Rice Husk ash. Equilibrium data obtained have been found to fit both the Langmuir and Freundlich adsorption isotherms.
-
study on the pozzolanic properties of Rice Husk ash by hydrochloric acid pretreatment
Cement and Concrete Research, 2004Co-Authors: Qingge Feng, Hirohito Yamamichi, Masami Shoya, Shuichi SugitaAbstract:The pozzolanic properties of Rice Husk ash by hydrochloric acid pretreatment are reported in the paper. Three methods have been used to estimate the pozzolanic activity of Rice Husk ash. The heat evolution and the hydration heat of cement, the Ca(OH)2 content in the mortar and the pore size distribution of mortar are determined. It is shown that compare with the Rice Husk ash heated untreated Rice Husk, the sensitivity of pozzolanic activity of the Rice Husk ash heated hydrochloric acid pretreatment Rice Husk to burning conditions is reduced. The pozzolanic activity of Rice Husk ash by pretreatment is not only stabilized but also enhanced obviously. The kinetics of reaction of Rice Husk ash with lime is consistent with diffusion control and can be represented by the Jander diffusion equation. A significant increase in the strength of the Rice Husk ash (pretreated) specimen is observed. The results of heat evolution indicate that the Rice Husk ash by pretreatment shows the behavior in the increase of hydration of cement. The cement mortar added with the Rice Husk ash by pretreatment has lower Ca(OH)2 content after 7 days and the pore size distribution of the mortar with the Rice Husk ash with pretreatment shows a tendency to shift towards the smaller pore size.
