Internal Thermally Coupled Distillation Column(ITCDIC) is the research frontier of distillation energy saving . This paper investigates the principium design of ideal ITCDIC. A novel design model of ideal ITCDIC is de...Internal Thermally Coupled Distillation Column(ITCDIC) is the research frontier of distillation energy saving . This paper investigates the principium design of ideal ITCDIC. A novel design model of ideal ITCDIC is derived, which can not only directly achieve the system characteristics and comparative characteristics with conventional distillation columns, but also be used for further control and design studies. A series of detailed operation analyses are carried out, which pave the way for further research and practice application.展开更多
Based on the previous design model, degrees of freedom analysis and transient analysis are carried out. A PID control model is proposed. The results show that ITCDIC is a self-regulating process, and could be operated...Based on the previous design model, degrees of freedom analysis and transient analysis are carried out. A PID control model is proposed. The results show that ITCDIC is a self-regulating process, and could be operated smoothly with two PID controllers; the steady state design could be disassociate with the dynamic design. An optimization model of ITCDIC design parameters is derived, which can directly achieve the optimal design parameters providing the maximum energy savings and the product quality simultaneously. Benzene-toluene system is studied as an illustrative example.展开更多
The interaction between the active chips mounted and the same base plate is considered as a thermoelectrical coupling effect.An approach to coupling effect analysis of a multi-chip system is presented with IGBT as a s...The interaction between the active chips mounted and the same base plate is considered as a thermoelectrical coupling effect.An approach to coupling effect analysis of a multi-chip system is presented with IGBT as a sample.Finite element method is used to evaluate the temperature distribution in power modules.The precise electrothermal model is obtained by fitting the curve of transient thermal impedance with a finite series of exponential terms,in which,the thermal-coupling effect among chips is considered as a prediction of the highest transient temperature of the chips.This model can be used in many thermal monitoring systems.Both ANSYS and PSPICE si- mulation software have been employed,and the simulation results agree with the experimental ones very well.展开更多
With the large-reserve discovery and exploitation of shale gas and natural gas hydrate all over the world,the production of liquid fuels and basic chemicals by replacing petroleum with abundant shale gas and natural g...With the large-reserve discovery and exploitation of shale gas and natural gas hydrate all over the world,the production of liquid fuels and basic chemicals by replacing petroleum with abundant shale gas and natural gas hydrate has become the focus of research and development in academia and industry.CO2 and CH4,as the main composition of shale gas and natural gas hydrate,are extremely stable and chemically inert,and thus selective activation and conversion of the two molecules remain grand challenges since the desired high-value products are more reactive than CO2 and CH4.Attributed to anthropogenic activities,billion tons of CO2 and CH4 are directly exhausted per year,and therefore,it is necessary to open up new routes to utilize the small molecular resource(Fig.1).展开更多
文摘Internal Thermally Coupled Distillation Column(ITCDIC) is the research frontier of distillation energy saving . This paper investigates the principium design of ideal ITCDIC. A novel design model of ideal ITCDIC is derived, which can not only directly achieve the system characteristics and comparative characteristics with conventional distillation columns, but also be used for further control and design studies. A series of detailed operation analyses are carried out, which pave the way for further research and practice application.
文摘Based on the previous design model, degrees of freedom analysis and transient analysis are carried out. A PID control model is proposed. The results show that ITCDIC is a self-regulating process, and could be operated smoothly with two PID controllers; the steady state design could be disassociate with the dynamic design. An optimization model of ITCDIC design parameters is derived, which can directly achieve the optimal design parameters providing the maximum energy savings and the product quality simultaneously. Benzene-toluene system is studied as an illustrative example.
文摘The interaction between the active chips mounted and the same base plate is considered as a thermoelectrical coupling effect.An approach to coupling effect analysis of a multi-chip system is presented with IGBT as a sample.Finite element method is used to evaluate the temperature distribution in power modules.The precise electrothermal model is obtained by fitting the curve of transient thermal impedance with a finite series of exponential terms,in which,the thermal-coupling effect among chips is considered as a prediction of the highest transient temperature of the chips.This model can be used in many thermal monitoring systems.Both ANSYS and PSPICE si- mulation software have been employed,and the simulation results agree with the experimental ones very well.
基金the financial support from the National Key R&D Program of China (2017YFA0700101 and 2016YFA0202801)the National Natural Science Foundation of China (21431003 and 21521091)the financial support from CAS Youth Innovation Promotion (2015145)
文摘With the large-reserve discovery and exploitation of shale gas and natural gas hydrate all over the world,the production of liquid fuels and basic chemicals by replacing petroleum with abundant shale gas and natural gas hydrate has become the focus of research and development in academia and industry.CO2 and CH4,as the main composition of shale gas and natural gas hydrate,are extremely stable and chemically inert,and thus selective activation and conversion of the two molecules remain grand challenges since the desired high-value products are more reactive than CO2 and CH4.Attributed to anthropogenic activities,billion tons of CO2 and CH4 are directly exhausted per year,and therefore,it is necessary to open up new routes to utilize the small molecular resource(Fig.1).
