고온고압 기포유동층 반응기에서 분무건조기로 성형제조한 아연계 탈황제(ZAC C)에 대하여 총 6회 황화-재생 반복실험을 500 ℃, 5 atm 조건에서 수행하였다. 1% H2S를 포함한 석탄모사가스를 반응기에 주입하여 황화반응을 시킨 결과 배출가스 중 H2S 농도는 10 ppmv 이하로 유지되었다. ZAC C의 황흡수력은 6회 황화반응 동안 각각 11.1, 10.9, 11.1, 11.1, 10.9, 10.5 g S/100 g sorbent으로 유지되어 초기 황흡수력을 유지하였다. 공기를 이용한 500 ℃ 재생반응에서 배출되는 SO2의 최대농도는 양론적으로 이론값과 일치하였다. 재생반응에서 탈황제 층의 온도는 발열반응에 의해 500 ℃에서 최대 750 ℃까지 상승하였다. 연속 70시간 동안 유동층 반응기내에서 실시된 ZAC C 탈황제의 비산되어 유출된 양은 1.07%이고, 실험 후 탈황제의 크기와 조직특성의 변화도 적었다. 고온고압반응기 multi-cyclone 실험결과 ZAC C 탈황제는 이론 황흡수력의 50% 이상을 유지하였고, 공기를 사용한 500 ℃의 재생반응이 원활하고 완전히 이루어졌고, 황산염생성과 같은 부반응이 없었다.

Two desulfurization-regeneration experiments for a spray-dried zinc-based sorbent(ZAC C) were performed at 500 ℃ and 5 atm in a fluidized-bed reactor(ID 0.097 mm) facility. The H2S concentration after each desulfurization run was maintained below 10 ppmv from a simulated coal gas of 1% H2S. The estimated sulfur absorption capacities of ZAC C sorbent were 11.1, 10.9, 11.1, 11.1, 10.9, 10.5 g S/100 g sorbent, and the sorption capacity of sorbent was maintained in spite of six times sorption experiments. The maximum SO2 concentration in regeneration effluent gas agreed with a stoichiometric value of 500 ℃(ca. 14 vol%). In regeneration run, the peak temperature of sorbent bed in the reactor reached up to 750 due to the vigorous exothermicity of regeneration reaction with neat air. While entrainment rate for 70 h continuous run in fluidized-bed_x000D_ reactor is 1.07%, the size and the textural properties of ZAC C sorbent also show a little change. Multi-cycle tests in fluidizedbed show that ZAC C sorbent maintains over 50% of its theoretical sorption capacity during 70 h run and regeneration reaction undergoes smoothly and completely without side reactions such as sulfate formation.

Hot Gas Desulfurization Fluidized Bed Reactor Air-Regeneration Sorbent

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