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Spectra selection methods:A novel optimization way for treating dynamic spectra and in-line near infrared modeling 被引量:2
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作者 Haiyan Wang Ronghua Liu +4 位作者 Lei Nie Dongbo Xu Wenping Yin Lian Li Hengchang Zang 《Journal of Innovative Optical Health Sciences》 SCIE EI CAS 2020年第4期28-38,共11页
Near infrared(NIR)spectroscopy is now widely used influidized bed granulation.However,there are still some demerits that should be overcome in practice.Valid spectra selection during modeling process is now a hard nut... Near infrared(NIR)spectroscopy is now widely used influidized bed granulation.However,there are still some demerits that should be overcome in practice.Valid spectra selection during modeling process is now a hard nut to crack.In this study,a novel NIR sensor and a cosine distance method were introduced to solve this problem in order to make thefluidized process into"visualization".A NIR sensor wasfixed on the side of the expansion chamber to acquire the NIR spectra.Then valid spectra were selected based on a cosine distance method to reduce the influence of dynamic disturbances.Finally,spectral pretreatment and wavelength selection methods were investigated to establish partial least squares(PLS)models to monitor the mois-ture content.The results showed that the root mean square error of prediction(RMSEP)was 0.124%for moisture content model,which was much lower than that without valid spectra selection treatment.All results demonstrated that with the help of valid spectra selection treatment,NIR sensor could be used for real-time determination of critical quality attributes(CQAs)more accurately.It makes the manufacturing easier to understand than the process parameter control. 展开更多
关键词 Near infrared spectroscopy fluidized bed granulation critical quality attributes real-time monitoring spectra selection
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Heat and mass transfer study in fluidized bed granulation-Prediction of entry length 被引量:2
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作者 Papiya Roy Manish Vashishtha +1 位作者 Rajesh Khanna Duvvuri Subbarao 《Particuology》 SCIE EI CAS CSCD 2009年第3期215-219,共5页
Fluidized bed granulation is a process by which granules or coated particles are produced in a single piece of equipment by spraying a hinder as solution, suspension, or melt on the fluidized powder bed. Heat and mass... Fluidized bed granulation is a process by which granules or coated particles are produced in a single piece of equipment by spraying a hinder as solution, suspension, or melt on the fluidized powder bed. Heat and mass transfer correlation useful for designing a granulator has been derived based on the equivalence of evaporation rate of the liquid to the heat transferred from hot gas to particles: (m/A)Dp^2λ/Lmf(1-εmf)(Tg-Tl)Kg=hDp/Kg.This equation is applied to data on granulation experiments by different workers to calculate Reynolds number and Nusselt number to obtain a relation between heat and mass transfer from gas to particles during granulation on a logarithmic scale from which the following empirical relation is obtained: Nu=0.0205Re^1.3876 which is comparable to Kothari's correlation Nu=0.03Re^1.3.By using the heat and mass transfer correlation obtained, the entry length, that is the length of granulator up to which effective heat transfer from gas to bed particles takes place, is estimated, which is also validated with experimental study. The correct estimation of entry length is useful in optimal design of a granulator. 展开更多
关键词 granulation Fluidized bed Gas to particle heat transfer Entry length
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