(J. of the Society of Agricultural Structures, Japan, (3), 183-189, 2008)
Extraction of Control Know-how for Charcoal Production and Estimation of the Amount of Exhaust Heat in the Charcoal Kiln

Shintaroh OHASHI, Kazuhiro NAKANO and Takashi EIKI

Summary

　The control techniques of practical charcoaling were considered based on measurement data and the carbonization process. The measurement data include amount of moisture, amount of tar and flow flux of the exhaust fumes from the chimney outlet. The results are as follows:(1)The transition from the first stage to the second stage was confirmed by an index composed of the temperature change from decrease to increase at 10cm below the ceiling in kiln, moisture discharge from chimney outlet, and the temperature below the central part in kiln rose to 300℃.(2)The barometer of the transition from the pyrolysis stage to the carbonization stage can be considered as the heating rate becomes extremely slow. (3)The homogenization of the temperature distribution in the kiln means the charcoaling process is shifting from the carbonization stage to the refining stage. (4)It is more efficient if the latent heat of the exhaust fumes from the chimney outlet is recovered. In addition, to recover exhaust heat out of kiln consistently, it is more effective to use a number of charcoal kilns time-lag-controlled based on the barometer of transition from pyrolysis stage to carbonization stage according to the upper part in kilns. From the results above, it is able to obtain the control techniques of practical charcoaling quantitatively. This is an important barometer to systematize the utilization of exhaust heat of charcoal kilns.



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