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Characterizing Animal-fats Biodiesel as Heating Fuel for Agricultural Hot Air Heater
김영중(Kim, Youngjung),박석호(Park, Seokho),김충길(Kim, Chungkil),김영진(Kim, Yeoungjin) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11
Biodiesel (BD) was made from animal-fats reacting with methanol and potassium hydroxide in the laboratory. The biodiesel made in the laboratory was sent to K-petro, the government agency, to inspect the quality of animal-fats biodiesel, of which generally the quality was acceptable for heating oil for agricultural hot air heater. Kinematic viscosity and calorific values of the biodiesels were measured. BD20(K), kerosene based biodiesel, showed 18cSt at -20?C. It seems that BD100 can not be suitable for heating fuel under some temperature. As BD content increased calorific value decreased, up to 40,000J/g for 100% BD, while light oil calorific value was 45,567J/g, showing difference of 5,567J/g, about 12% difference. Several different fuels, BD20, BD50, BD100 and light oil, were prepared and tested for fuel combustion qualities for agricultural hot air heater and their combustion performances were compared and analyzed. Flame dimensions of biodiesels and light oil were almost same shape at the same combustion condition in the burner of the hot air heater. Generally CO₂ amounts of BDs are greater than light oil. But,the differences are so small that it is hard to tell there was significant difference existed between the BDs combustion and light oil.
김영진 ( Youngjin Kim ),김영중 ( Youngjung Kim ),김충길 ( Chungkil Kim ),홍성하 ( Sungha Hong ) 한국농공학회 2012 한국농공학회 학술대회초록집 Vol.2012 No.-
본 왕겨연소시스템은 기존의 벼 순환식 건조기의 연료인 보일러 등유를 왕겨로 대체하고자 개발되었다. 쌀 생산공정전체 투입 에너지 중 건조공정에서 소모되는 에너지 비중이 약 57%로 가장 크다. 또한 농업용 면세유의 가격은 최근 리터당 약 1,300원선 까지 급등하였다. 왕겨는 탄소배출증가가 없는 바이오매스 에너지원으로 가격도 등유의 약 10%정도에 불과하다. 이 새로운 연소시스템은 싸이클론 방식의 연소로, 열교환기, 연료공급부, 배기굴뚝과 운전장치로 이루어지며, 곡물건조기의 건조열풍을 공급한다. 또한 기존의 5톤이하 소형 곡물건조기에 그대로 연결하여 사용이 가능하다. 왕겨의 연소효율은 최대 약 98%로 거의 완전연소에 가까운 효율을 발휘하였으며, 생성된 열풍의 온도는 45±2℃로 기존 등유버너에 의한 열풍에 비하여 훨씬 안정적인 온도제어 성능을 보였다. 실제 벼건조시험을 한 결과 8시간동안 건조를 통해 함수율은 22.5%에서 15.1%로 나타났고, 동할율은 0.1% 증가하는 우수한 건조성능을 나타내었다. A rice husk combustion system was developed in order to replace the conventional kerosene burner of grain dryer. Drying energy is about 57% of the total energy consumed in rice production system. Price of kerosene, the expensive fossil fuel has risen up into about 1,000 won for 1 liter(4 US$/gal) in tax-free price for agriculture production purpose in Korea. Rice husk is a kind of carbon neutral bio mass energy resource, and its price is only about 10% of kerosene. This new rice husk combustion system produces hot air for grain dryer. It consists of a cyclone combustion chamber, heat exchanger of shell and tube type, feed element, an exhaust gas funnel and a control box. This rice husk combustion system can be connected to a conventional grain dryer of 5 ton or less capacity. The combustion efficiency of the cyclone camber is 98% at most, and it can provide hot air temperature in 45± 2℃, which is more reliable than any conventional kerosene burner for grain drying. The efficacy of this new system was tested with moisture contents and crackage. During 8 hours drying in a circulation dryer, the moisture contents decreased from 22.5% to 15.1%, a crackage of 0.1% was occurred.