Abstract

본 연구에서는 농촌지역을 중심으로 대표적인 겨울철 난방기구인 화목보일러 화재위험성을 평가하였다. 화목보일러 연료투입구 주변 및 연통의 온도를 측정하였으며, 연통 내부에 축적되는 타르의 화재 위험성을 평가하였다. 연료 투입구개방 상태에서 전방의 온도를 측정한 결과 화목 투입구로부터 40 cm 이상 떨어진 영역에서는 온도가 약 <TEX>$40^{\circ}C$</TEX> 이하를 유지하였다. 본 연구에서는 연료 투입구 외부로 비산되는 불티가 60 cm 이내의 범위에 비산되었다. 연통 내부에서는 온도가 <TEX>$600^{\circ}C$</TEX> 이상까지 상승하였으며, 화목보일러 본체로부터 2 m 떨어진 위치의 연통 내부에서 온도가 <TEX>$420^{\circ}C$</TEX> 이상 도달하였다. 연통 내부의 타르를 수거하여 발화온도를 측정한 결과 약 <TEX>$398^{\circ}C$</TEX>를 기록하였다. 화목보일러 본체 및 연통 표면에서 온도가 약 <TEX>$300^{\circ}C$</TEX> 이상 도달하였으며 가연물이 접촉될 경우 착화되었다. In this study, experiments were carried out to evaluate the fire risk of a firewood boiler, which is mainly used as a winter heating apparatus in rural areas. The ambient temperatures of the combustion chamber and the duct were measured. The fire risk of tar inside the duct was also investigated. The temperature decreased less than <TEX>$40^{\circ}C$</TEX> in the region more than 40 cm from the combustion chamber. Fire- flakes were scattered in the range of less than 60 cm from the combustion chamber. The temperature inside the rose to above <TEX>$600^{\circ}C$</TEX>. At 2 m from the boiler body, the temperature inside the duct was increased to about <TEX>$420^{\circ}C$</TEX>. The ignition temperature of tar was about <TEX>$398^{\circ}C$</TEX>. The temperatures of the boiler and duct surface were above <TEX>$300^{\circ}C$</TEX>. Combustible material ignited when it contacted the boiler surface or duct surface.

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