INTRODUCTION

As we all know, blocking and air leakage are two important factors that can influence the drying effect of wood chip dryer. If one part in wood shavings dryer is blocked, consequences like poor air circulation, high relative humidity of flue gas, poor rate of heat flow and air leakage of ventilating system would occur. In order to maintain the smooth condition of ventilating system and improve the drying efficiency of wood chip dryer, the wind speed at the discharging mouth should be controlled at about 1.5-3m/s.

If the flow speed of hot air becomes slow or the flame breaks out from the outside of furnace door, parts in wood shavings dryer are easy to be blocked or leak air. The part that is easy to be blocked in wood shavings dryer is the dust collecting system. If there is something wrong with the dust collector like poor thermal insulation or damage of insulating layer, dew formation is easy to occur and dust in flue gas is easy to precipitate. The precipitated dust finally causes the blocking in wood shavings dryer. Except for the dust collecting system, parts like horizontal duct and flap valve are liable to be blocked. What we can do is to clean the parts regularly.

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