Simultaneous experiments of sulfidation and regeneration in two pressurized fluidized-bed reactors for hot gas desulfuri
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Simultaneous Experiments of Sulfidation and Regeneration in Two Pressurized Fluidized-bed Reactors for Hot Gas Desulfurization of IGCC Chang-Keun Yi', Sung-Ho Jo, Bong-Hee Lee*', Seung-Yong Lee, Jae-Ek Son and Gyoung-Tae Jin Korea institute of Energy Research, Daejeon 305-343, Korea *Department of Chemical Engineering, Chungbuk National University, Cheongju 361-763, Korea (Received 5 March 2001 , accepted 5 ,hdy 200t)
Abstraet-ltot ()as Desullhrizm'ion tbr IGCC is a new method m efficiently remove II,S in thel gas with regenerable sorbents at high temperature and high-pressure conditions. The Korea Institute of Energy Research did operation of sullidation in a dcsuilhrizc~" and regeneration in a regenerator sinmltaneously at high pressure and high temperature conditions. Thc H2S concentratkm at exit was maintained continuously bdow 50 ppmv at 11,000 ppmv of inlet H,S concentration. The sorbent had little etlbct on the reducing power in the inlet gas in the range li'om 11% m 33% of H 2. As inlet H,S concentration was increa%xL H,S concentration in the p,'oduct gas was also increased linearly. The ~rbent was maintained at low sultilr [evel by the continuous regeneration and the conthmous solid circulation at the rate of 1.58.~.104 kg/s with little mean particle size change. Key: words: blot (}as Desulfitfization, Hydrogcn Sulfide, Sorbent. Fluidizcd Bed Reactor, IGCC
INTRODUCTION A Hot Gas Desulfurization (HGD) technique is one of elemental technologies in the IGCC (Integrated Gasification Combined Cycle) having both high thermal efficiency and very low emissions [Gangwal et al., 1989: Woods et al, 1990; Choiet al., 2001]. The existing conventional wet-type I{S desulfitrization processes require cooling and reheating of the gas stream, resulting in significant reduction in thermal efficiency of the system as well as costly wastewater treatment, llot gas desulfurization is a new method to efficiently remove l--f_,S,COS in fuel gas with regenerable sorbent at high temperature and high-pressure condition. The HGD process consists of a sulfidation reactor, a regeneration reactor and solid circulation loops connecting both reactors. The key for successful process development is how well the solid circulation and transport system between two reactors operate, Especially, it is difficult to run the system continuously and mbly because it is operated at high pressure and high temperature, Most of the researches of hot gas dcsulfurization sorbent development have been performed in batch cyclic test or TGA to see bow much sorbents absorb sulfur of H~S and COS in reducing gas ILl and Flytzani-Stephanopoulos, 1997: Gasper-Galvin et at., 1998; Jothimurugesan and Gangwal, t998; Abbasian and Slimane, 1998: Alonso et at., 2000; Lee et aI., 1995, 1997; Lira et al., 2000: Song et aL 2000]. However, it is not enou~ to see the real performance of the sorbent in a batch cyclic test because a real hot gas desflRtrization plant is operated at the continuous mode of mlfidation and regeneration in which the sulfur loading of the sorbent in
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