서지주요정보
내부순환 유동층 반응기에서 연소에 의한 잔사유 탈황 폐촉매 재생 특성 = Regeneration characteristics of spent vacuum residue hydrodesulfurization catalysts by combustion
서명 / 저자 내부순환 유동층 반응기에서 연소에 의한 잔사유 탈황 폐촉매 재생 특성 = Regeneration characteristics of spent vacuum residue hydrodesulfurization catalysts by combustion / 정대성.
저자명 정대성 ; Jung, Dae-Sung
발행사항 [대전 : 한국과학기술원, 2003].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8014078

소장위치/청구기호

학술문화관(문화관) 보존서고

MCBE 03029

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

In the kinetic study of char in the spent catalyst (C : 38 wt.\%, S: 4.8 wt.\%) and $O_2$, the effects of regeneration or combustion temperature (550 $^\circ$C - 750 $^\circ$C) and partial pressure of $O_2$ (0.09 atm - 0.21 atm) on combustion reaction rate have been determined in a thermobalance reactor. Among the reported models (shrinking core, volumetric and modified volume reaction models), the modified volume reaction model is the best to predict the present conversion data. The kinetics parameters (activation energy, pre-exponential factor and reaction order) are determined on the basis of the modified volume reaction model. From the Arrhenius plot, the activation energy and the pre-exponential factor are found to be 19.810 kJ/mol and 15.738 l/min respectively. The reaction order is found to be 1.41 with respect to $O_2$ partial pressure in the range of 0.09 atm - 0.21 atm at 650 $^\circ$C. The combustion reaction rate of char in the spent catalyst with $O_2$ can be expressed as: ◁수식 삽입▷(원문을 참조하세요) In regeneration of the spent catalyst, the effect of reaction time (0 min - 50 min) as a function of conversion (0 - 1) on surface area, pore volume and average pore diameter of the catalyst have been determined in a thermobalance reactor. The spent catalyst is regenerated in terms of physical properties by removal of coke by combustion. The regeneration characteristics of the spent catalyst have determined in an ICFB (Internally Circulating Fluidized Bed - 0.3 m I.D × 3 m high) with a draft tube (0.1m I.D × 0.9 m high). In the ICFB, the axial temperature profile is uniform at the annulus gas velocity (Ua) above 0.8 Umf (minimum fluidization velocity) or the excess air for combustion above 53\%. The removal rates of carbon and sulfur in the spent catalyst increase with increasing combustion temperature. However, the removal rates of carbon and sulfur in the spent catalyst increase marginally at temperature above 550 ℃. Also, the removal rates of carbon and sulfur in the spent catalyst are found to be insignificant with increasing gas velocity in the draft tube (Ud). The removal rate of carbon increases with increasing Ua up to 1.2Umf and levels-off thereafter. The removal rate of sulfur in the spent catalyst increases with an increase in Ua due to the increase of excess air for combustion. As excess air increases, the removal rate of sulfur in the spent catalyst increases due to prevention of $SO_3$ or $SO_4$ formation on alumina support and the removal rate of carbon increases insignificantly above the excess air of 96\%. The removal percentage of carbon is found to be 99.4\% and the weight percentage of carbon for the regenerated catalyst is 0.2\%. Surface area after regeneration of the spent catalyst is found to be 114\%. It can be claimed that the present ICFB process is better than the other processes for regeneration of the spent catalyst based on the carbon removal rate and surface area recovery of the catalyst.

서지기타정보

서지기타정보
청구기호 {MCBE 03029
형태사항 viii, 94 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Dae-Sung Jung
지도교수의 한글표기 : 김상돈
지도교수의 영문표기 : Sang-Done Kim
학위논문 학위논문(석사) - 한국과학기술원 : 생명화학공학과,
서지주기 참고문헌 : p. 91-94
주제 유동층
연소
잔사유 탈황 폐촉매
내부순환 유동층
Fluidized bed
Combustion
Spent Vacuum Residue Hydrodesulfurization Catalysts
ICFB
QR CODE qr code