Abstract
A newly fabricated test furnace agricultural green house was examined, for was filled with 35,400g of combustible Japanese cedar, 3,400g of charcoal, 2,100g of chaff, and 1,700g of ash. Gas-exchanger was charged by 1.5 liter of a platinum catalyst (NM-103). The experiment was conducted using a furnace and a gas-exchanger. Concentration of carbon monoxide inside of the test furnace fluctuated in the range between 1,000ppm and 6,000ppm, and then abruptly increased to 9,500ppm on the 11th day. Carbon monoxide inside of the chimney stayed below 10ppm until the 9th day, and increased to 2,005ppm on the 10th day, then decreased. Carbon monoxide inside of the house remained in the range between 1ppm and 4ppm after ignition, and reached the highest point of 44ppm on the 11th day. The concentration then suddenly decreased. These abrupt changes of the carbon monoxide concentration presumably caused by the closed nature of the test furnace, in which the water contained in wood and other materials stayed at the bottom of the test furnace and penetrated the combustible materials and ash, thus leading to incomplete combustion. The odor level inside the house was 326 at maximum. This level, however, came from the sudden increase of odor caused by incomplete combustion before extinguishing, and it was not an odor intensity reflecting the odor of cultivated plants.
