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- 저자 : Ali Allahverdi (검색결과 2 건)
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Seyed Ali Ashrafizadeh,Majid Amidpour,Ali Allahverdi 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.5
This paper presents an investigation of the effects of temperature gradient distribution by the aid of a secondary burner on exergetic and environmental functions of the cement production process. For this reason, the burning system of the cement production (kiln & preheater) process was simulated in four thermal areas. Three lines of cement production with 2,000, 2,300 and 2,600 ton/day were investigated. Fuel injection ratio into the secondary burner, from 10 to 40 percent was studied for each line. The obtained results show that, for cyclone preheaters, fuel injection into the secondary burner up to a proportion resulting in the minimum temperature required for alite formation (2,200 oC)in the kiln burning zone is suitable. For shaft preheaters, however, according to percent calcinations, there exists an optimum proportion for 15 to 20 percent injection fuel into secondary burner. Finally, it was shown that the secondary burner application can reduce the exergy losses about 25 percent, which leads to a reduction of the green house gases of about 35000 cubic meters per year for each ton per day of clinker production.
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Evaluation of two different methods to synthesize cobaltaluminate spinel
Shiva Salem,Seyyed Hamid Jazayeri,Federica Bondioli,Ali Allahverdi,Mansoor Shirvani 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.6
The aim of this research is to study the efficiency of both microwave-hydrothermal and combustion methods to synthesize CoAl2O4 spinel. To attain the objectives, precursor solutions of CoCl2·2H2O and AlCl3·6H2O were applied to prepare cobalt aluminate spinel by a microwave-hydrothermal method and the effects of pH (4, 8 and 12), residence time (1 and 2 h), and temperature of the digestion system (190 and 220 oC) on the properties of final powders were studied. Moreover, mixed solutions of Al(NO3)3·9H2O, Co(NO3)2·6H2O and glycine were used as a precursor in the combustion synthesis method and the effect of different molar ratios of fuel to nitrate (0.36, 0.56) and calcination temperatures (800, 1000 oC) were evaluated. The powders obtained were characterized by XRD, XPS, SEM, TEM, FT-IR and UV-Vis. The results show that CoAl2O4 spinel is not formed by the microwave-hydrothermal method under the variable conditions studied, while the combustion synthesis method is capable of producing nano-particles of CoAl2O4 spinel and according to the results of TEM and Scherrer’s equation most of the particles have sizes less than 100 nm.
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