Energy purpose is the dominant usage, but, the fatal problem appears when wood is burnt in the direct burning boiler system. The problem is plenty of clinker. Ash contains potassium oxide much, which lowers the fusing point of ash, that produces clinker, difficult to deal with. Wood contains many kinds of mineral at certain balance that accelerate the plant's growth, but modern agricultural land lacks it. In direct burning system, burnt at high temperature, minerals become clinker, insolubles, which can not assimilate to plants nor soil microorganism.
Minerals are to be the treasure, but currently it's only useless waste.
Under the background above, we have devised the continuous gasification system in Japan. That is a repetitive swinging method, basically a modified moving bed method. Normal moving bed method has a difficulty to blow in the necessary air for gasification at the fixed point, but in this R.S. method, we can blow in needed amount of air from the bottom. And the balance between produced wood gas and charcoal can be controlled by temperature operation. In Japan, charcoal is getting a new way of utilization, especially to organic farming as a soil amelioration material.