HWAHAK KONGHAK, Vol.38, No.5, 698-705, October, 2000
고온고압건식 유동층 탈황공정의 고체흐름특성 해석
An Analysis of Solid Folw Characteristics in a Fluidized Bed High Pressure Hot-Gas Desulfurization System
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초록
탈황로와 재생로로 구성된 고온, 고압의 IGCC 공정용 유동층 탈황공정에서 유동특성이 고려된 입자수지의 해석을 수행하였다. 탈황로에서 입자의 마모속도상수, 사이클론의 분급 입경, 유속, 고정층 높이의 변화와 재생로에서 사이클론 분급 입경의 변화에 따른 고체흐름특성의 변화를 모사하였다. 탈황로의 고정층 높이, 기체유속, 탈황제의 마모속도상수가 증가함에 따라 새로 주입되는 탈황제량과 재생로 하부에서 탈황로로 주입되는 고체량이 증가하였다. 탈황로와 재생로의 사이클론 분급 입경이 증가함에 따라 새로 주입되는 탈황제량은 증가하는 반면 재생로 하부에서 탈황로로 주입되는 고체량은 감소하였다. 탈황제 소모량에는 탈황로에서 사이클론 포집 효율 즉 사이클론의 분급 입경이 가장 중요한 변수이며, 탈황로에서 기체유속, 정체층 높이, 탈황제의 마모속도상수도 무시될 수 없는 인자들임을 알 수 있었다. 공정의 입도 분포는 탈황로 사이클론의 포집 효율에 지배적인 영향을 받았으며 타 변수들의 영향은 무시될 수 있었다. 탈황공정의 부하조절 방법에 고려될 수 있는 변수로는 탈황로에서 유속이 가장 중요하며, 탈황로 사이클론의 포집 효율 즉 사이클론의 분급 입경도 상당한 영향을 주는 것으로 사료되었다.
A particle population balance has been developed to analyze characteristics concerning solid flow rates of input and output streams and their particle size distributions in a fluidized bed high pressure hot-gas desulfurization process of the IGCC system that consists of a desulfurizer and a regenerator. Simulation on the solid flow rate and its particle size distribution has been carried out with variations of principal process parameters such as the attrition rate constant of sorbent, cut diameter of the cyclone, bed weight and gas velocity in the desulfurizer and the cut diameter of the cyclone in the regenerator. As the attrition rate constant of sorbent, the bed weight and gas velocity of the desulfurizer increased, the feed rate of fresh sorbent and the flow rate of solid from the regenerator to the desulfurizer were predicted to increase. As cut diameters of desulfurizer and regenerator cyclones increased, the feed rate of fresh sorbent were predicted to increase, however, the flow rate of solid from the regenerator to the desulfurizer were predicted to decrease. The most important factor affecting solid flow rates of input and output streams and their particle size distributions was found to be the cut diameter of the desulfurizer cyclone. Effects of the attrition rate of sorbent, gas velocity and bed weight in the desulfurizer on the feed rate of fresh sorbent were predicted somewhat important because they affect the particle attrition rate. Particle size distributions of the process were influenced mainly by the collection efficiency of the desulfurizer cyclone, however, effects of other parameters were negligible. The gas velocity in the desulfurizer was found the most important parameter for load control and the effect of the collection efficiency of the desulfurizer cyclone on load control was moderate.
- Yi CK, "Solid Circulation Technology for the Stable Operation of a Hot Gas Desulfurization Bench-Scale Unit(II)," IGCC Research Report, Taejon, 1 (1998)
- Ji PS, "Development of a Hot Gas Clean-up Technology for IGCC," IGCC Research Report, Taejon, 45 (1994)
- Lee TJ, Park NK, Kim JH, Kim KS, Park YW, Yi CK, HWAHAK KONGHAK, 34(4), 435 (1996)
- Kang SH, Rhee YW, Kang Y, Han KH, Lee CK, Jin GT, HWAHAK KONGHAK, 35(5), 642 (1997)
- Gupta RP, Gangwal SK, "Enhanced Durability of Desulfurization Sorbents for Fluidized-Bed Application," DOE Report DOE/MC/25006-3271 (1992)
- Yi CK, Bae DH, Shun D, Jin GT, Son JE, HWAHAK KONGHAK, 37(4), 604 (1999)
- Overturf BW, Reklaitis GV, AIChE J., 29, 813 (1983)
- Choi JH, Ph.D. Dissertation, Korea Advanced Institute of Science and Technology, Taejon, Korea, 338 (1989)
- Kunii D, Levenspiel O, "Fluidization Engineering," 2nd ed., Betterworth-Heinemann, Boston, 340 (1991)
-
Choi JH, Chang IY, Shun DW, Yi CK, Son JE, Kim SD, Ind. Eng. Chem. Res., 38(6), 2491 (1999)
- Choi JH, Ma SC, Shun DW, Son JE, Kim SD, HWAHAK KONGHAK, 35(2), 300 (1997)
- Merrick D, Highley J, AIChE Symp. Ser., 70, 366 (1974)
- Lapple CE, Chem. Eng., 58, 147 (1951)