Extraction of Control Know-How for Charcoal Production and Estimation of the Amount of Exhaust Heat in the Charcoal Kiln
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概要
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The control techniques of practical charcoaling were considered based on measurement data and the carbonization process. The measurement data included amount of moisture, amount of tar and flow flux of the exhaust fumes from the chimney outlet. The results were as follows:(1) The transition judgment from the 1st stage to the 2nd stage was confirmed by a change in the heating rate from negative to positive in the upper part of the kiln. Charcoaling know-how is the act of reducing the amount of ventilation in response to this.(2) The transition judgment from the 2nd stage to the 3rd stage was confirmed by a reduction in the amount of moisture and tar in the exhaust gas. Charcoaling know-how is the act of extending the opening area of the chimney outlet in response.(3) It is possible to control the carbonization time during the transition period from the 2nd stage to the 3rd stage by controlling the ventilation rate. At this stage it is important for uniform quality in charcoal production and for maintenance of the charcoal production quantity that the temperature in the upper and central parts of the kiln be maintained close to 500°C, and that the chimney outlet be extended in order to cancel the carbonization delay in the lower part of the kiln.(4) The transition judgment from the 3rd stage to the 4th stage was confirmed by the equalization of the temperature in the kiln. Charcoaling know-how was the act of opening of the chimney outlet in response.(5) 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 under time-lag control based on the parameters of transition from the 2nd stage to the 3rd stage.From these results, control techniques of practical charcoaling can be quantitatively obtained. These are important parameters to systematize the utilization of exhaust heat from charcoal kilns.
- 農業施設学会の論文
農業施設学会 | 論文
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