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How to control the sawdust rotary dryer to have the needed output moisture content ?

Time:2019年11月13日      Hits:

01. Regarding to the PLC for the sawdust dryer machine, as only after you have enough data regarding to the relationship between the sawdust rotary dryer rotation speed and output moisture content, then we may can use the PLC control. Thus actually it is rather difficult to use PLC Controller, and in actual operation it even will make the simple question more complex and will not save time and energy.  

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02. Except the moisture content of the wet sawdust,  the balance of the drying system's work performance is mainly influenced by the heat input (burner), hot air volume(induced draft fan), dryer rotation speed (drying time), and feeding quantity of wet sawdust.

     Although the initial moisture content of wet sawdust is vary from 30 to 45 %, but after the drying process by sawdust drying machine, the output moisture content of the dry sawdust is even, in actual operation just the output moisture content will be higher or lower. Then you can according to the actual output moisture content, to adjust the wet sawdust feeding quantity, heat input, hot air volume, sawdust dryer rotation speed accordinglly, and to find the balance point that the sawdust rotary dryer can have the best work performance. In fact it is aim of the commissioning process.

   In the commissioning process, for example, when the the heat input, hot air volume, sawdust dryer rotation speed, wet sawdust feeding quantity are certain, then check the output moisture content of dry sawdust (Please record these related data.):

  If the output moisture content is in the range of 12%-18%, and the output capacity also is up to 3 t/h, then check the temperature of the dryer outlet end (There are temperature sensors are installed on the inlet end and outlet end of the sawdust dryer, on the electric control panel there are meter to show the dryer inlet end temperature and dryer outlet end temperature), for example, the temperature at rotary sawdust dryer machine outlet end is 75 centigrade, 

then in the future operation, 

If the sawdust dryer outlet end temperature is around 75 centigrade, then it means that the output moisture content of dry sawdust will be about 12-18%; 

If the sawdust dryer outlet end temperature is significantly less than 75 centigrade, it means the the moisture content of dry sawdust will be higher than 18% (the reason would be the moisture content of your wet sawdust is too high), then you please gradually reduce the wet sawdust feeding quantity until the dryer outlet end temperature is up to about 75 centigrade, then you can get the needed dry sawdust with moisture content about  12-18%.

If the sawdust rotary dryer outlet end temperature is significantly higher than 75 centigrade, it means the the moisture content of dry sawdust will be less than 12%  and too dry (the reason would be the moisture content of your wet sawdust is too low), then you please gradually increase the wet sawdust feeding quantity until the dryer outlet end temperature return back to about 75 centigrade, then you can get the needed dry sawdust with moisture content about  12-18%.

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