Microwave heating applications of fluidized beds: High purity silicon production
Başlık çevirisi mevcut değil.
- Tez No: 400612
- Danışmanlar: PROF. JAMES L. KUESTER
- Tez Türü: Doktora
- Konular: Elektrik ve Elektronik Mühendisliği, Mühendislik Bilimleri, Electrical and Electronics Engineering, Engineering Sciences
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 1992
- Dil: İngilizce
- Üniversite: Arizona State University
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Elektrik-Elektronik Mühendisliği Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 305
Özet
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Özet (Çeviri)
The use of microwaves as an alternative energy source to heat fluidized bed reactors was investigated. The cavity resonance technique based on frequency tuning was utilized to measure the dielectric properties of materials studied for fluidized bed heating as a function of temperature. The dielectric properties of 10 silicon samples of various sizes from two different sources were measured as a function of temperature in the range 23-650°C. The dielectric constant of silicon samples increased sharply between 150 to 350°C but did not appreciably change above 350°C. The loss factor initially increased with temperature reaching a maximum at about 240°C and 280°C for the samples from two sources, respectively. Larger particles size samples displayed a minimum in the 460 to 470° C range. In addition, the dielectric properties of pyrolysis alumina, dolomite, sand and cobalt/alumina catalyst were measured at various points between room temperature and 610°C. The dielectric constant and loss factor of all samples except cobalt/alumina catalyst stayed approximately constant with temperature. The dielectric constant and loss factor of cobalt/alumina catalyst exhibited a noticeable increase with temperature. Microwave tuning behavior of the experimental fluidized bed reactor was also theoretically and experimentally investigated as a function of dielectric properties and dielectric bed height in the reactor. Lower order mode resonance frequencies were computed and verified experimentally. The electric field distribution foT the dominant mode in the reactor was calculated for the purpose of obtaining information about temperature distribution in the reactor. The fluidized bed reactor existing prior to this research was modified to accommodate microwave entry from the bottom of reactor. Microwave heated fluidized bed reactor experiments were conducted with silicon, alumina and cobalt/alumina catalyst- The alumina bed was heated to temperatures above 1000°F while cobalt/alumina catalyst was calcined at about 800°F. Microwave heating of silicon in the fluidized bed reactor was demonstrated at temperatures above 1250°F, Temperate profiles in the reactor were favorable for the actual silicon deposition. Based on results found in this research and literature values, microwave fluidized bed deposition of silicon was estimated to consume less then 5 KW/kg Si produced. This value represents a substantial decrease in the energy consumption of the process.
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