|■ Heat source, Saturated steam|
Even KENKI DRYER uses only saturated steam as its heat source, it is outstanding in safety and hygiene point of view with its unique drying mechanism based on combined use of conductive heat transfer method and heated air method. Since steam is a stable heat source, quality of discharged material after drying is also stable and equable. Maximum allowed steam pressure is 0.7Ma and adjustment of steam pressure, adjustment of drying temperature in other words, can be easily done. Saturated steam is commonly used in many factories so that it can be said as a familiar and handy heat source. In comparison with drying methods using burner or hot blasts, saturated steam method is an indirect drying applying heat exchange via pipes that steam is passing through, therefore, it hardly burns the materials and is outstanding in safety and hygiene point of view.
Saturated heat has specific characteristics. Steam temperature changes according to steam pressure, so that adjustment of drying temperature can be done easily. Also, because condensation heat and latent heat can be used, its quantity of heat is 2 to 5 times larger than sensible heat of hot water, oils etc. and it can be said as one of the most suitable heat source for drying. Saturated steam turns to drain after being used for drying and running cost can be kept low by collecting and re-using it as hot feedwater for steam generating boilers.
|■ Temperature is adjusted to the desired level by changing pressure.|
Temperature of the dryer can be adjusted to the desired level by changing steam pressure.
|■ Using latent heat of steam|
The heat capacity of the latent heat of the steam is about 2-5 times as large as that one of oil or hot water.
|■ The drain and the flash steam discharged after drying can be reused.|
Fuel cost can be reduced by collecting and re-using drain and flash steam discharged after drying.
|■ Comparison with hot air drying|
Difference in running cost is mostly depends on fuel cost. Also, the low-temperature drying makes less damages on the dryer’s body.