• 자원리싸이클링
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• 제25권5호
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• pp.14-27
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• 2016

청정석탄기술 중 하나인 석탄가스화 복합발전기술의 이론적 고찰 및 주요단위공정에 사용되는 고온건식 탈황제의 연구 및 기술개발 동향을 조사하였다. 고온건식 탈황제 개발의 중요한 요소는 반응성, 내구성 및 내마모성에 있으며, 탈황제 종류는 칼슘계, 아연계, 망간계, 철계, 구리계 등이 있다. 현재 고온건식 탈황제의 경우 선진국을 중심으로 아연계 탈황제 제조기술이 가장 상용화 단계에 있으며, 국내에서도 다양한 지지체를 사용하여 가격이 저렴하고 성능이 우수한 아연계 및 비아연계 고온건식 탈황제의 상용화를 위한 연구개발이 진행 중에 있다.

• 한국환경보건학회지
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• 제31권6호
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• pp.483-488
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• 2005

The waste seashells were used for the removal of hydrogen sulfide from a hot gas stream. The sulphidation of waste seashells with $H_{2}$S was studied in a thermogravimetric analyzer at temperature between 600 and $800^{circ}C$. The desulfurization performance of the waste seashell sorbents was experimentally tested in a fixed bed reactor system. Sulfidation experiments performed under reaction conditions similar to those at the exit of a coal gasifier showed that preparation procedure and technique, the type and the amount of seashell, and the size of the seashell affect the $H_{2}$S removal capacity of the sorbents. The pore structure of fresh and sulfided seashell sorbents was analyzed using mercury porosimetry, nitrogen adsorption, and scanning electron microscopy (SEM). Measurements of the reaction of $H_{2}$S with waste seashells show that particles smaller than 0.631 mm can achieve high conversion to CaS. According to TGA and fixed bed reactor results, temperature had influenced on $H_{2}$S removal efficiency. As desulfurization temperature increased, desulfurization efficiency increased. Also, maximum desulfurization efficiency was observed at $800^{circ}C$. Desulfurization was related to calcinations temperature.

• 한국환경보건학회지
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• 제29권3호
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• pp.86-90
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• 2003

In this study, lots of methods have been studing to utilize energy and decrease contaminated effluents. There has been great progress on IGCC (Integrated gasification combined cycle) to reduce thermal energy losses. The following results have been conducted from desulfurization experiments using waste shell to remove H$_2$S. Fixed bed desulfurization experiments, to obtain basic data for scale-up was indicated. Oyster was the best among the various sorbents, like the results of TGA. Especially, H$_2$S removal efficiency of uncalcined oyster was the highest. When use oyster as desulfurization sorbents, calcination process was not needed. Thus, high desulfurization efficiency would be expected. Fixed bed reactor experiments were indicated particle size of sorbents. These had influenced on desulfurization capacity. As smaller particle size was found better desulfurization capacity. Large capacity difference was found between 0.613 mm and 0.335 mm. But, differences between 0.335 mm and 0.241 mm was relatively small. As bed temperature increased, H$_2$S removal capacity increased. Therefore, both particle size and bed temperature should be considered to remove H$_2$S by sorbents.

• 에너지공학
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• 제7권1호
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• pp.73-80
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• 1998

Zinc titanate 탈황제를 제조하여 연료가스의 고온탈황에 사용된 탈황제의 재생에 대해서 연구하였다. 준비된 탈황제의 Zn/Ti 몰비는 1.5이고 반응기는 내경 1 cm와 3 cm의 석영관 고정층반응기들을 사용하였다. 고온에서 zinc titanate 탈황제의 재생은 발열반응을 수반하여 탈황제의 물성을 저하시킨다. 따라서 zinc titanate 탈황제의 가장 적합한 재생조건을 선정하기 위해서 반응온도, 산소함량, 유량변화, steam 함량 등을 변화시키면서 재생반응을 실험하였다. 탈황-재생의 실험동안 H2S와 SO2의 파과곡선을 구하였다. 또한 반응실험 전후의 탈황제의 물성을 SEM, XRD, Hg-porosimetry 및 BET로 분석하였다. 이런 결과들로부터 zinc titanate 탈황제에 가장 적합한 재생조건은 $650^{\circ}C$, O2 함？ 5%, steam 함량 10% 이상이라는 결론을 얻었다.

• 한국환경보건학회지
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• 제36권2호
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• pp.136-140
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• 2010

The integrated gasification combined cycle (IGCC) is one of the most promising proposed processes for advanced electric power generation that is likely to replace conventional coal combustion. This emerging technology will not only improve considerably the thermal efficiency but also reduce or eliminate the environmentally adverse effects normally associated with coal combustion. The IGCC process gasifies coal under reducing conditions with essentially all the sulfur existing in the form of hydrogen sulfide ($H_2S$) in the product fuel gas. The need to remove $H_2S$ from coal derived fuel gases is a significant concern which stems from stringent government regulations and also, from a technical point of view and a need to protect turbines from corrosion. The waste seashells were used for the removal of hydrogen sulfide from a hot gas stream. The sulphidation of waste seashells with $H_2S$ was studied in a thermogravimetric analyzer at temperature between $600^{\circ}C$ and $800^{\circ}C$. The desulfurization performance of the waste seashell sorbents was experimentally tested in a fixed bed reactor system. Sulfidation experiments performed under reaction conditions similar to those at the exit of a coal gasifier showed that preparation procedure and technique, the type and the amount of seashell, and the size of the seashell affects the $H_2S$ removal capacity of the sorbents. The pore structure of fresh and sulfided seashell sorbents was analyzed using mercury porosimetry, nitrogen adsorption, and scanning electronmicroscopy.

• 한국환경보건학회:학술대회논문집
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• 한국환경보건학회 2005년도 Proceedings of KSEH.Minamata Forum
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• pp.66-71
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• 2005

The waste seashells were used for the removal of hydrogen sulfide from a hot gas stream. The sulphidation of waste seashells with $H_2S$ was studied in a thermogravimetric analyzer at temperature between 600 and 800$^{\circ}C$. The desulfurization performance of the waste seashell sorbents was experimentally tested in a fixed bed reactor system. Sulfidation experiments performed under reaction conditions similar to those at the exit of a coal gasifier showed that preparation procedure and technique, the type and the amount of seashell, and the size of the seashell affect the $H_2S$ removal capacity of the sorbents. The pore structure of fresh and sulfided seashell sorbents was analyzed using mercury porosimetry, nitrogen adsorption, and scanning electron microscopy.

• 공업화학
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• 제8권1호
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• pp.122-131
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• 1997

아연-티타늄 복합금속산화물 탈황제를 제조하여 석탄가스중의 $H_2S$를 제거하는 고온탈황성능을 연구하였다. $H_2S$ 흡수에 의한 탈황제의 황화반응실험을 충전층 관형 흐름반응기를 사용하여 $550{\sim}750^{\circ}C$ 범위에서 수행한 결과 탈황율과 아연성분의 손실측면에서 $650^{\circ}C$가 최적 황화반응 온도임이 밝혀졌다. SEM 분석에 의해서 $650^{\circ}C$에서의 황화반응과 $750^{\circ}C$에서의 재생반응에 따른 탈황제 입자의 구조변화를 관찰하였다. 탈황성능의 지속성과 탈황제 내구성을 평가하기 위하여 연속적인 황화-재생 cycle 반응실험을 수행하였으며 10번째 cycle 이후에 수거반 탈황제 시료의 특성을 BET, XRD, SEM/EDX에 의해서 분석하였다. 아연-티타늄 복합 산화물 탈황제는 연속적인 황화-재생 cycle 동안에 거의 일정한 탈황성능을 나타내었다.

• 한국수소및신에너지학회논문집
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• 제25권5호
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• pp.482-490
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• 2014

Gaseous sulfur compound such as $H_2S$ or COS in coal- or biomass-derived hot syngas can be purified by solid sorbents at high temperatures. In this study, we investigated the physical properties and reactivity of solid regenerable desulfurization sorbents with 37.2, 41.9, and 46.5wt% ZnO to look into the ZnO content effect. The sorbents were produced by spray-drying method to apply to a fluidized-bed process. Sulfidation and regeneration reaction were carried out using a thermogravimetric analyzer. Sorbent prepared with 46.5wt% ZnO had physical properties suitable for a fluidized-bed process applications such as spherical shape, sufficient mechanical strength and density, high porosity and surface area. It showed high sulfur sorption capacity of 10.4wt% (ZnO utilization of 57%) at reaction temperatures of 500 and $650^{\circ}C$ for sulfidation and regeneration, respectively. However, the sulfur sorption capacity and ZnO utilization were significantly reduced and dimple shape appeared when the ZnO content decreased to 37.2 and 41.9wt%. Sulfur sorption capacity and regenerability were improved as reaction temperature increased within the experimental temperatures used in this work. The reaction temperature zones of $1500{\sim}550^{\circ}C$ and $650{\sim}700^{\circ}C$ are recommended for sulfidation and regeneration, respectively, to lead best reaction performances of the ZnO-based spray-dried sorbents developed in this work.

• 한국에너지공학회:학술대회논문집
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• 한국에너지공학회 2000년도 추계 학술발표회 논문집
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• pp.73-77
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• 2000

A great deal of research has been carried out in the last twenty some years to develop high temperature desulfurization. For example, the efficiency of advanced power generation processes based on the integrated gasification combined cycle (IGCC) can be increased significantly with high temperature desulfurization. Much of the recent high temperature desulfurization research has concentrated on zinc-based sorbents such as zinc ferrite(ZnFe$_2$O$_4$) and zinc titanate(ZnO.xTiO$_2$) due to its thermodynamic advantage in capturing H$_2$S molecules.(omitted)

• 한국에너지공학회:학술대회논문집
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• 한국에너지공학회 1992년도 학술발표회 초록집
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• pp.117-118
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• 1992