Due to a higher operating temperature(≥800 ℃),Solar Particle Receiver(SPR)which uses particles as the working medium is considered as one of best candidates to improve the thermoelectric conversion efficiency of con...Due to a higher operating temperature(≥800 ℃),Solar Particle Receiver(SPR)which uses particles as the working medium is considered as one of best candidates to improve the thermoelectric conversion efficiency of concentrating solar power plants.In this paper,a quartz tube solid particle receiver model is fully developed by using the discretized lumped parameter method,in which the calculation process of particle temperature and thermal loss is clearly given.In order to improve the manipulation level of particle receiver during the operation,the dynamic characteristics of the quartz tube particle receiver are comprehensively studied by the disturbance test of selected input parameters.Besides,in order to grasp the influence rule of key parameters on the thermal performance of particle receiver,the key parameters'sensitivity analysis is also deeply studied.The results show that the particle outlet temperature can reach as high as 810 ℃ under a relatively small value of solar flux 600 kW/m^(2),but the receiver efficiency is only about 75%;Besides,the receiver efficiency shows a variation tendency that it rises first falls afterwards with the increase of incident solar flux.The validity of proposed model is verified by a heating experi-mental system with a single quartz tube,and the relative error is not more than 7.9%.The research results are beneficial for understanding the dynamic characteristics and designing the particle receiver.展开更多
A flame-heated puartz tube was utilized as an atomzer for atomic absorption spectrometric determination of lead with thermospary sampling.Under optimal conditions,a sensitivity enhancement factor of 92 was obtained in...A flame-heated puartz tube was utilized as an atomzer for atomic absorption spectrometric determination of lead with thermospary sampling.Under optimal conditions,a sensitivity enhancement factor of 92 was obtained in comparison with that of conventional flame atomic absorption spectrometry.Detection limits for lead was 3ng/mL compared with 80ng/mL by conventional flame atomic absorption spectrometry.The proposed method was applied for the determination of trace lead in a river water sample with recovery of 96-102%.展开更多
基金financial support provided by Beijing Municipal Natural Science Foundation“Study on the gas-solid heat transfer characteristics and enhancement mechanism of fluidized bed solid particle/sCO_(2) heat exchanger in solar thermal power plant”(No.3222033)by Chinese Universities Scientific Fund(No.15052003).
文摘Due to a higher operating temperature(≥800 ℃),Solar Particle Receiver(SPR)which uses particles as the working medium is considered as one of best candidates to improve the thermoelectric conversion efficiency of concentrating solar power plants.In this paper,a quartz tube solid particle receiver model is fully developed by using the discretized lumped parameter method,in which the calculation process of particle temperature and thermal loss is clearly given.In order to improve the manipulation level of particle receiver during the operation,the dynamic characteristics of the quartz tube particle receiver are comprehensively studied by the disturbance test of selected input parameters.Besides,in order to grasp the influence rule of key parameters on the thermal performance of particle receiver,the key parameters'sensitivity analysis is also deeply studied.The results show that the particle outlet temperature can reach as high as 810 ℃ under a relatively small value of solar flux 600 kW/m^(2),but the receiver efficiency is only about 75%;Besides,the receiver efficiency shows a variation tendency that it rises first falls afterwards with the increase of incident solar flux.The validity of proposed model is verified by a heating experi-mental system with a single quartz tube,and the relative error is not more than 7.9%.The research results are beneficial for understanding the dynamic characteristics and designing the particle receiver.
文摘A flame-heated puartz tube was utilized as an atomzer for atomic absorption spectrometric determination of lead with thermospary sampling.Under optimal conditions,a sensitivity enhancement factor of 92 was obtained in comparison with that of conventional flame atomic absorption spectrometry.Detection limits for lead was 3ng/mL compared with 80ng/mL by conventional flame atomic absorption spectrometry.The proposed method was applied for the determination of trace lead in a river water sample with recovery of 96-102%.
