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RISS 인기검색어
- 검색키워드
- 저자 : ( Ln-hee Hwang ) (검색결과 2 건)
- 무료
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( Ln-hee Hwang ),( Yutaro Sakai ),( Takayuki Matsuo ),( Yasumasa Tojo ),( Toshihiko Matsuto ) 한국폐기물자원순환학회(구 한국폐기물학회) 2018 한국폐기물자원순환학회 심포지움 Vol.2018 No.1
Slaked lime is commonly used as alkali agent for dry scrubbing of acidic gases such as hydrogen chloride and sulfur oxide in flue gas discharged from municipal solid waste incinerator (MSWIs). As the utilization amount of slake lime is the most among chemicals used in MSWI, its influence on the cost of flue gas treatment is significant. In our previous research, the on-site production condition of slaked lime using low cost quicklime was examined to develop a hydrator installed in MSWL As the result, slaked lime with same acid gas removal performance as commercial one was obtained. However, when the produced slaked lime was stored in a hopper and supplied with a feeder, the amount of adhesion on the wall surface was increased, which led to the problem that the quantitative supply to duct became impossible. Thus, the improvement of flow properties of the produced slaked lime was required. The aim of this research was to clarify the effect of the production conditions on the acid gas removal rate and the flow property of slaked lime and to find production conditions that both acidic gas removal performance and flow property become equal to or higher than commercial slaked lime. For this purpose, the molar ratio of distilled water to quicklime (MR=2.0 and 2.5), stirring rate (10~40rpm), residence time (30~60min) of hydration process, etc. were examined using a lab-scale of hydrator. Hydration rate, water content, hydrogen chloride removal rate, particle size distribution, specific surface are/pore volume, angle of repose, and <Uscharge rate of slake lime from circular orifice were measured to evaluate produced slaked lime. Residence time of quicklime varied by the angle of paddle (5~20°) in hydrator. Since the hydration rate was constant at 97% or more at the retention time of 46 min, the operation was performed with the paddle angle fixed at 10。. The water content of slaked lime produced at MR=2.5 was higher but it was decreased to the same level of slaked lime produced at MR=2.0 when the stirring rate was increased to 40 rpm. The water content of slaked lime obtained at MR = 2.0 was barely changed regardless of stirring rate. The angle of repose was high at MR=2.5, indicating that the flow property was comparatively poor. The discharge rate of the slaked lime produced at MR=2.5 was relatively slow too. It was considered that the flow property of slaked lime deteriorated as the amount of water added to quicklime increased. The variation of the removal rate of hydro gen chloride depending on stirring rate and MR was small. Slaked lime with hydrogen chloride removal performance equivalent to commercial one was obtained under the production condition tested in this work. It was suggested that slaked lime can be obtained at MR=2.0 and stirring rate=10 or 20 rpm, which has the same acid gas removal performance and flow property as commercial slaked lime.
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