| 학회 |
한국화학공학회 |
| 학술대회 |
2008년 가을 (10/23 ~ 10/24, 부산 BEXCO) |
| 권호 |
14권 2호, p.3231 |
| 발표분야 |
유동층 |
| 제목 |
Radial gas mixing in a riser of circulating fluidized bed |
| 초록 |
Gas mixing characteristics should be determined to predict conversions and selectivities of chemical reactions in fluuidized bed reactors. In a circulating fluidized bed, gas concentration profiles of the core region are different from those of the wall region in the bed. Thus, the degree of chemical conversiondepends on gas exchange rate between these two regions. In the present study, the effects of gas velocity (1.5-3.4 m/s) and solid circulation rate (0-170 kg/m2s) on the radial gas mixing coefficients (Dr) of gas dispersion between the core and wall regions were determined in a circulating fluidized bed (5 cm-i.d. × 6.7 m-high). Helium gas as a tracer was steadily injected into the center of the riser and the collected gas from the sampling probes were measured by a gas chromatograph with TCD detector. Based on the core-annulus model, the gas dispersion is predominant in the core region when solid circulation. Also, the radial gas mixing coefficient increases with increasing solid circulation rate (Gs) and decreases with increasing gas velocity (Ug) in the riser. The radial dispersion coefficients in the present and previous studies have been correlated based on the isotropic turbulence theory. |
| 저자 |
김국희1, 우상훈1, 김상돈1, 김지민2, 박덕수2, 김용승2
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| 소속 |
1한국과학기술원, 2SK에너지 |
| 키워드 |
radial gas mixing; CFB; core-annulus
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| E-Mail |
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| 원문파일 |
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