|■ Self-cleaning screw / Steam Heated Twin Screw Technology
（ SHTS technology ）
One of the International Patented Technology that KENKI DRYER has is a self-cleaning structure called Steam Heated Twin Screw technology (SHTS technology). No matter how materials are sticky, adhesive and viscous is, they can be dried without clogging inside of the dryer because of this unique structure that no other products has.
For example, even materials stuck to the blades of one screw, blades of the other screw in the dryer’s body forcibly peels the materials off as they rotate. Since the blades rotate by peeling the material off each other, any sticky, adhesive and viscous material does not adhere to the blade, and the blades continue rotating, peeling, agitating and heating material without stopping while they carries material further. Even raw material slurry which is strongly sticky and adhesive is fed with liquid state, the slurry can be dried surely without any trouble by using this technology. This SHTS technology took about 7 years to be completed and it is patented or applied for patents not only in domestics but also in abroad.
Also, in case of drying of organic sludge after dehydration process of water treatment, sludge often forms large lumps because they are affected by flocculant, and it often happens that only surface is dried but inside are not when sludge is discharged as large lumps. However, using by this technology, the materials being dried are forcibly sheared and torn off when they touch the pair of blades, or a blade and trough/cases. As the drying process is proceeded, the materials being dried becomes smaller and smaller since they are forcibly peeled off when they stuck to the blade, and also repeatedly shared, torn off and agitated during being carried and heated. As the size of the material being dried gets smaller, heat can be conducted and reached to inside the material thoroughly and quality of the material after drying becomes stable. Because of the low-temperature drying using saturated steam, there is no possibility that materials after drying are discharged with unstable quality caused by being carbonized, scorched or unevenly heated.
|Self-cleaning and shearing mechanism, agglomeration prevention|
|■ Self-cleaning structure|
Even materials stuck on the blades of one screw, blades of the other screw peel the materials off as they rotate. No sticky or adhesive materials can stick on the blades. Hence, any kind of material can be dried without being clogged inside the dryer.
Unique shaped screw blades agitate the material enough, and the material can be dried completely by being heated from deep inside.
|■ Shearing mechanism, agglomeration prevention|
One of the characteristics of Steam Heated Twin Screw Technology is its self-cleaning mechanism, and it also includes mechanism of shearing and tearing off the materials to be dried. Sludges after dehydration process of water treatment often forms large lumps because of effect of flocculant, and drying process becomes difficult since heat hardly reaches to inside as the sludge forms larger lumps. By the unique structure of rotating blades that SHTS technology has, material to be dried is sheared and torn off when pair of blade intersect each other and blades touch trough and case. The material is also agitated when the blades rotate.
The materials stuck to the blade are forcibly peeled off and also series of movement which are shearing, tearing off and agitating are repeated while material is being heated and dried. Therefore, the materials being dried does not shape large lumps since they are not affected by flocculant, and their size become smaller as they move forwards in the dryer. As the material become smaller, heat can reach inside of them thoroughly and quality of material after drying become more stable. Unstable output whose surface is dried but inside is not dried often seen after drying of organic sludge etc., however, KENKI DRYER never discharges the material with such unstable quality.
The following is picture of organic waste in a food plant after being dried. By comparing the size of the material after drying, smaller grains contain low moisture contents.
|■ SHTS Self-cleaning screw Video
Drying no other one can do. any sticky, adhesive stuff
|■ Easy moisture content adjustment|
As residence time of materials inside of the dryer can be adjusted by changing rotation speed of shafts, moisture content can also be adjusted.