먼지/유해가스(NOx) 동시처리용 다기능성 세라믹필터 제조 및 열화특성 Fabrication and degradation characteristics of multi-functional ceramic filter for simultaneous removal of dust/NOx원문보기
본 연구에서는 코디어라이트 원료를 이용한 세라믹 필터를 제조함에 있어서, 출발원료크기 및 유․무기 첨가제 등 조건 변화에 대한 세라믹 필터의 특성인 강도, 기공율, 압력손실 등에 미치는 영향을 연구하고, 여과층 코팅조건 및 집진효율, 촉매제조 및 NOx 제거 성능 분석를 실시하였다. 또한 세라믹 필터의 표면개질을 통하여 비표면적을 향상시킴으로써 촉매의 효율이 어떻게 변하는지, 제조된 세라믹 필터의 여과층과 촉매에 대한 ...
본 연구에서는 코디어라이트 원료를 이용한 세라믹 필터를 제조함에 있어서, 출발원료크기 및 유․무기 첨가제 등 조건 변화에 대한 세라믹 필터의 특성인 강도, 기공율, 압력손실 등에 미치는 영향을 연구하고, 여과층 코팅조건 및 집진효율, 촉매제조 및 NOx 제거 성능 분석를 실시하였다. 또한 세라믹 필터의 표면개질을 통하여 비표면적을 향상시킴으로써 촉매의 효율이 어떻게 변하는지, 제조된 세라믹 필터의 여과층과 촉매에 대한 가속 수명시험을 실시하여 필터의 수명을 예측하고 고장기구를 해석하였다. 마지막으로 다기능성 세라믹 필터 사용시 주 고장원인으로 도출된 스트레스 인자에 대해서 가속열화시험을 통해 feedback 연구를 행하였다.
본 연구에서는 코디어라이트 원료를 이용한 세라믹 필터를 제조함에 있어서, 출발원료크기 및 유․무기 첨가제 등 조건 변화에 대한 세라믹 필터의 특성인 강도, 기공율, 압력손실 등에 미치는 영향을 연구하고, 여과층 코팅조건 및 집진효율, 촉매제조 및 NOx 제거 성능 분석를 실시하였다. 또한 세라믹 필터의 표면개질을 통하여 비표면적을 향상시킴으로써 촉매의 효율이 어떻게 변하는지, 제조된 세라믹 필터의 여과층과 촉매에 대한 가속 수명시험을 실시하여 필터의 수명을 예측하고 고장기구를 해석하였다. 마지막으로 다기능성 세라믹 필터 사용시 주 고장원인으로 도출된 스트레스 인자에 대해서 가속열화시험을 통해 feedback 연구를 행하였다.
In order to develop porous ceramic filters which can remove both dust and hazardous gas contained in flue gas at high temperature, I have researched the fabrication of ceramic filters, the coating of filtration layer for dust removal, the removal efficiency of dust, the removal efficiency of hazardo...
In order to develop porous ceramic filters which can remove both dust and hazardous gas contained in flue gas at high temperature, I have researched the fabrication of ceramic filters, the coating of filtration layer for dust removal, the removal efficiency of dust, the removal efficiency of hazardous gas and the durability of multi-functional ceramic filters against thermal shock , etc. Porous ceramic filters were fabricated and used as a catalyst support. The effects of mean particle size, organic content and addition of foaming agent on the porosity, compressive strength and pressure drop of ceramic filters have been investigated. From the results of research, the optimum condition for the fabrication of ceramic filters could be acquired and they had the porosity of 58%, the compressive strength of 13.4 MPa and the pressure drop of 250 Pa. A dust intrusion into pores in catalytic ceramic filters makes catalyst activity decrease to low level. Therefore, in order to prevent the dust intrusion into pores in catalytic ceramic filters and remove dust in flue gas, filtration layer was coated on the surface of ceramic filters using spray coating or dip coating. The filtration layer coated by spray coating had less pressure drop and more homogeneous microstructure than that by dip coating. The ceramic filters coated with filtration layer could remove 99.6% of dust. Ceramic filters with only V2O5 catalyst showed the NOx removal efficiency of 80%. Acid treatment of ceramic filters increased the specific surface area of ceramic filters and therefore, their NOx removal efficiency was improved up to 90% and was equal to that of commercial filters with V2O5/TiO2 catalyst which were used at SCR(selective catalytic reduction) process. Durability test, failure analysis and accelerated degradation test were carried out to predict the lifetime of filtration layer ceramic filters. The failure mechanism of filtration layer in multi-functional ceramic filters was turned out to be the generation and growth of crack at the surface of filtration layer, which were caused by thermal shock, whereas the failure mechanism of catalyst was proved to be the decrease of catalytic active sites, caused by high temperature. The lifetime of multi-functional ceramic filters mainly depended not on the lifetime of catalyst but on that of filtration layer. The lifetime of multi-functional ceramic filters could be improved by controlling the contents of inorganic binder and sintering conditions.
In order to develop porous ceramic filters which can remove both dust and hazardous gas contained in flue gas at high temperature, I have researched the fabrication of ceramic filters, the coating of filtration layer for dust removal, the removal efficiency of dust, the removal efficiency of hazardous gas and the durability of multi-functional ceramic filters against thermal shock , etc. Porous ceramic filters were fabricated and used as a catalyst support. The effects of mean particle size, organic content and addition of foaming agent on the porosity, compressive strength and pressure drop of ceramic filters have been investigated. From the results of research, the optimum condition for the fabrication of ceramic filters could be acquired and they had the porosity of 58%, the compressive strength of 13.4 MPa and the pressure drop of 250 Pa. A dust intrusion into pores in catalytic ceramic filters makes catalyst activity decrease to low level. Therefore, in order to prevent the dust intrusion into pores in catalytic ceramic filters and remove dust in flue gas, filtration layer was coated on the surface of ceramic filters using spray coating or dip coating. The filtration layer coated by spray coating had less pressure drop and more homogeneous microstructure than that by dip coating. The ceramic filters coated with filtration layer could remove 99.6% of dust. Ceramic filters with only V2O5 catalyst showed the NOx removal efficiency of 80%. Acid treatment of ceramic filters increased the specific surface area of ceramic filters and therefore, their NOx removal efficiency was improved up to 90% and was equal to that of commercial filters with V2O5/TiO2 catalyst which were used at SCR(selective catalytic reduction) process. Durability test, failure analysis and accelerated degradation test were carried out to predict the lifetime of filtration layer ceramic filters. The failure mechanism of filtration layer in multi-functional ceramic filters was turned out to be the generation and growth of crack at the surface of filtration layer, which were caused by thermal shock, whereas the failure mechanism of catalyst was proved to be the decrease of catalytic active sites, caused by high temperature. The lifetime of multi-functional ceramic filters mainly depended not on the lifetime of catalyst but on that of filtration layer. The lifetime of multi-functional ceramic filters could be improved by controlling the contents of inorganic binder and sintering conditions.
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