根据Washburn浸渍理论(Penetrationtheory)和vanOss Good Chaudhury的组合理论及应用柱状灯芯技术(Columnwickingtechnique),测试了用超临界CO2方法制备的不同分子量聚丙烯腈(PAN)的表面特性。结果显示,PAN的分子量影响其表面性能。... 根据Washburn浸渍理论(Penetrationtheory)和vanOss Good Chaudhury的组合理论及应用柱状灯芯技术(Columnwickingtechnique),测试了用超临界CO2方法制备的不同分子量聚丙烯腈(PAN)的表面特性。结果显示,PAN的分子量影响其表面性能。与一般聚合物的表面能随分子量增大而增大的规律不同,超临界方法制备的聚丙烯腈(PAN)的表面能随着分子量的增大而降低,但其Lifshitz vanderWaals力却随分子量的增大而增大。与常规方法生产的PAN的表面性能比较,超临界方法可能使PAN的极性减少。展开更多
A mathematical method was proposed for the determination of absolute adsorption from experimental isotherms. The method is based on the numerical equality of the absolute and the excess adsorption when either the gas ...A mathematical method was proposed for the determination of absolute adsorption from experimental isotherms. The method is based on the numerical equality of the absolute and the excess adsorption when either the gas phase density or the amount adsorbed is not quite considerable. The initial part of the experimentalisotherms, which represents the absolute adsorption, became linear with some mathematical manipulations. The linear isotherms were reliably formulated. As consequence, either the volume or the density of the supercritical adsorbate could be determined by a non-empirical way. This method was illustrated by the adsorption data of supercritical hydrogen and methane on a superactivated carbon in large ranges of temperature and pressure.展开更多
This article reviews the problems of Russia-made 800-MW coal-fired supercritical boilers in Suizhong Power Plant, such as burner bumout, water-wall leakage, slag screenⅠexplosion, crack happened on the desuperheater ...This article reviews the problems of Russia-made 800-MW coal-fired supercritical boilers in Suizhong Power Plant, such as burner bumout, water-wall leakage, slag screenⅠexplosion, crack happened on the desuperheater outlet of reheater and welding defect of economizer; tells the process of renovating these units by modifying the original design and adjusting the operation parameters. After several years' effort, all the problems have been well solved. The experience may be useful for other imported units in China.展开更多
Biomass as a sustainable and renewable energy source is starting to gain momentum, especially as more economical energy extraction methods prevail. SCWBG （supercritical water biomass gasification） is one of the more...Biomass as a sustainable and renewable energy source is starting to gain momentum, especially as more economical energy extraction methods prevail. SCWBG （supercritical water biomass gasification） is one of the more promising methods to extract energy from biomass in a gaseous form due to its lower temperature and simpler setup. In this work, two biomass and two bio-waste samples are gasified in SCW （supercritical water） under two temperatures （hence water densities）. As temperature increases and water density decreases, combustible gas yields tend to increase due to changes in reaction pathways and reaction rates. An analytical comparison is also made between the four different types of biomass in terms of the combustible gases produced and hence the energy value. As a result of this analysis beet skin produces the most methane and corn silage yields the most hydrogen. The two bio-waste samples （straw and beet skin） are found to have the highest HHV （higher heating values）.展开更多
文摘 根据Washburn浸渍理论(Penetrationtheory)和vanOss Good Chaudhury的组合理论及应用柱状灯芯技术(Columnwickingtechnique),测试了用超临界CO2方法制备的不同分子量聚丙烯腈(PAN)的表面特性。结果显示,PAN的分子量影响其表面性能。与一般聚合物的表面能随分子量增大而增大的规律不同,超临界方法制备的聚丙烯腈(PAN)的表面能随着分子量的增大而降低,但其Lifshitz vanderWaals力却随分子量的增大而增大。与常规方法生产的PAN的表面性能比较,超临界方法可能使PAN的极性减少。
基金the National Natural Science Foundation of China (No. 29936100).
文摘A mathematical method was proposed for the determination of absolute adsorption from experimental isotherms. The method is based on the numerical equality of the absolute and the excess adsorption when either the gas phase density or the amount adsorbed is not quite considerable. The initial part of the experimentalisotherms, which represents the absolute adsorption, became linear with some mathematical manipulations. The linear isotherms were reliably formulated. As consequence, either the volume or the density of the supercritical adsorbate could be determined by a non-empirical way. This method was illustrated by the adsorption data of supercritical hydrogen and methane on a superactivated carbon in large ranges of temperature and pressure.
文摘This article reviews the problems of Russia-made 800-MW coal-fired supercritical boilers in Suizhong Power Plant, such as burner bumout, water-wall leakage, slag screenⅠexplosion, crack happened on the desuperheater outlet of reheater and welding defect of economizer; tells the process of renovating these units by modifying the original design and adjusting the operation parameters. After several years' effort, all the problems have been well solved. The experience may be useful for other imported units in China.
文摘Biomass as a sustainable and renewable energy source is starting to gain momentum, especially as more economical energy extraction methods prevail. SCWBG （supercritical water biomass gasification） is one of the more promising methods to extract energy from biomass in a gaseous form due to its lower temperature and simpler setup. In this work, two biomass and two bio-waste samples are gasified in SCW （supercritical water） under two temperatures （hence water densities）. As temperature increases and water density decreases, combustible gas yields tend to increase due to changes in reaction pathways and reaction rates. An analytical comparison is also made between the four different types of biomass in terms of the combustible gases produced and hence the energy value. As a result of this analysis beet skin produces the most methane and corn silage yields the most hydrogen. The two bio-waste samples （straw and beet skin） are found to have the highest HHV （higher heating values）.
