• Journal of Biosystems Engineering
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• v.22 no.1
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• pp.21-29
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• 1997

왕겨 재를 분쇄하여 콘크리트 混和용 재료로 이용하려는 연구의 일환으煙로서, 파이로트 規模의 多目的 왕겨 燒却爐를 設計, 裂作하고 그 性能을 分析하였다. 왕겨 燃燒時의 熱에너지는 回收하여 원예施設의 煖房이나 콘크리트의 高溫 養生水로써 이용하고자 熱交煥裝置를 제작하여 왕겨 燒각爐시스템에 장착하였고, 排煙가스내의 이산화탄소가 시설원예 作物의 光合成에 이용될 수 있는지 排煙가스의 造成을 조사하였다. 분쇄된 왕겨 재의 큰크리트 混和材로서의 적합성은, 燃燒 灰分의 성분 중 $SiO_2$ 의 結晶化 상태를 分析함으로써 判斷하였다. 연구결과를 要約하면 다음과 같다. 1. 왕겨 灰分의$SiO_2$ 結晶化는 燃燒온도 $750^circ C$ 이하에서는 거의 발생하지 않는 것으로 분석되었다. 2. 燒却爐의 작동은 매우 만족스러웠으며 最適 작동조건은 왕겨供給率 15kg/h. 制御온도 $600^{\circ}C$로 分析되었다. 最適 작동조건에서, 왕겨燃燒率은 97%, 熱交換機 效率은 59.5%, 전체 시스템의 熱效率은 57.7%로서 양호하였으며, 灰分의 $SiO_2$ 結晶化도 거의 발생하지 않아 生成된 왕겨 灰分은 훌륭한 큰크리트 混和在로 판단 되었다. 3. 燒却爐내 溫度分布는 대체로 均一하였으며, 排煙가스내의 大氣오염물질 중, 질소酸化物과 황酸化物 함량은 許容기준치보다 매우 낮았으나 일산화탄소 함량은 許容기준값 부근으로 나타나 排煙가스를 직접 원예시설 내에 공급하기 위해서는 약간의 연소실 구조 개선이 필요하다고 판단되었다.

• Journal of Biosystems Engineering
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• v.20 no.3
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• pp.250-261
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• 1995

This study has been performed to develop an agricultural waste incinerator to combust the rice hull originated from RPC with the typical disposal treatment capacity of 30kg/h and to test performance of the developed incinerator. Experimental results are summarized as following. 1. The optimum feed rate of rice hull of the incinerator is 30kg/h with air ratio of 1.5. 2. The contents of $SO_2$ in flue gas is maximum 18ppm(when rice hull feed rate was 20kg/h and air ratio of 1.5), minimum 7ppm(when rice hull feed rate was 30kg/h and air ratio of 1.5) and average 11ppm. So there is no environmental pollution problem for the incinerating treatment of rice hull of the RPC. 3. The temperature of water of heat exchanger are $53^{circ} C$ and $62^{circ} C$ with water flow rate $3{ell}/min$ and $1.5{ell}/min$ at the optimum combustion condition, respectively. 4. According to theoretical energy calculation, the energy from rice hull combustion may be amounted as much as 80%~190% of energy supplied by kerosene required by RPC.

• Journal of Biosystems Engineering
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• v.24 no.1
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• pp.9-18
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• 1999

This study was performed to investigate the optimum microalgal culture conditions using flask culture and to find the feasibility of using the flue gas of the rice husk incinerator for cultivating the microalgae. The optimum initial pH of media was 4.5 for the microalgae culture, and the intermittently illuminated culture was more effective than the continuous illuminated culture. Thus, the balance between photosynthesis and formative metabolism must be considered thoroughly to cultivate microalgal cells. The optimum CO2 concentrations were in the range of 7 to 10%, and the optimum temperature was about 35$^{\circ}C$ in both the daytime and the nighttime for the culture. When flue gas of the rice husk incinerator was applied to the microalgae culture using stirred photobioreactor, the dry cell weight was 0.026 g dry biomass/hr$.$l. The results obtained in experiments indicated that the flue gas was effective for microalgae culture without any limitations.

• Clean Technology
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• v.17 no.4
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• pp.336-345
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• 2011

The total area of forest land in Korea is 64.2%, and significant forest resources can continuously be produced. However our country didn't separate the recyclable waste wood and was illegal landfill or incinerated. In this study, waste-wood and rice husk of biomass and low-grade-anthracite made refuse derived fuel by mixing and compressing. In addition, the binding effect of binders and additives were analyzed. Physical and chemical characteristics of manufactured refuse derived fuel were analyzed and evaluated suitability by compared with quality standards. A result of change with compressed and relaxed density, added 20% anthracite and 10% rice husk is optimal density change and average density increased large range when 20 wt.% P.V.A., guargum, molasses and 10 wt.% starch were added. All fuel samples be distributed over 3,500 kcal/kg LHV and grade of No. 3~4 fuels appeared. A result of the characteristics of physical and chemical compressed biomass refuse derived fuel with addictive, 12.9% of durability improvement appeared when is mixing asphalt and 5.8% of durability improvement appeared when is mixing rice bran by pretreatment of NaOH 5%.