■ About rotary dryer 


Rotary dryer is continuous type dryer which hit hot air to the materials fed into cylindrical drum as it rotates.
Lifters are attached inside the drum and hot air hits to the materials while the materials are being lifted and agitated. Diameter and length of the rotary drum is designed regarding amount of material to be treated and it can manage a large amount as well.
For sticky and adhesive materials, however, high temperature heating is required to prevent adhesion and it causes a large amount of fuel cost and CO2 generation.
When sludges are dried with this dryer, fed materials tend to be lump shape like snowballs because of coagulant’s effects and heating with rotation, and dry state can be different between the surface and inside of the materials. In addition, it is necessary to pay attention to uneven heating and charring of dried products.
Since its heat source is hot air at high temperature, a large amount of fuel is consumed when hot air is generated with direct heating with burners etc. and also consumable parts need to be replaced frequently since their life is short. As a result, running cost becomes high.
Also, fireproofing and heat insulating materials which are expensive and requires long working hours for replacement needs to be replaced regularly.
Due to its high temperature heating, dusts scatter and make work environment bad, so it is necessary to install dust collectors although it is not required for KENKI DRYER.
Rotary dryer is a dryer which goes against the protection of global environment by consuming a large amount of fuel for its drying and generating a lot of CO2.


■ Comparison with KENKI DRYER


KENKI DRYER uses conductive heat transfer at low temperature with latent heat of saturated steam, therefore, its heat efficiency is good and its running costs such as for fuel and consumable parts are very low.
Since amount of saturated steam used KENKI DRYER is small and decarbonization and fuel cost reduction is possible by using redundant steam from the plants.
The low-temperature drying makes change of components of the materials fairly small and the dried materials can be use in various purposes such as raw-materials, fuel, soil conditioner, etc.
Even for sticky and adhesive materials that no other products can deal with, by unique technology which has international patents. No matter how sticky and adhesive the material is, the dryer is never clogged.
Sludge discharged from wastewater treatment plants contains flocculants. They become lumps during the drying process, and it becomes difficult for heat to reach inside. The material to be dried are smashed during the drying process, so they does not form lumps and keeps their size small. Heat reaches inside of the materials and the materials are dried steadily and evenly.
It can run continuously for 24hour/day and no staff need to be on-site.
Work environment with KENKI DRYER which uses low temperature drying is very good in safety and hygiene prospective. KENKI DRYER is an eco-friendly decarbonizing dryer which is safe and does not generate CO2.
KENKI DRYER is a dryer which can manage any materials and also can vaporize a very large amount of moisture and relatively inexpensive. KENKI DRYER is an eco-friendly decarbonizing dryer which is safe and does not generate CO2.

KENKI DRYER has unique technologies which has international patents, such as self-cleaning, hot air circulation, feeding device and crashing mechanisms while rotary dryer don’t have them.


ModelKENKI DRYERRotary dryer
Heat sourceSteam
0.7Mpa・G or less
Hot air
Drying temperatureAdjustable depending on drying condition
Maximum temperature inside the dryer is about 140℃
Very high temperature
To prevent materials to be adhere to dryer
Condition of dried materialsSmall change in the composition
Can be recycled
Dried with uneven baking and scorches 
Dust collectorNot requiredRequired
Fuel costLowHigh
Frequency of parts replacementInfrequentFrequent
Running costLowHigh
Self-cleaning mechanismAvailableNot available
Hot air circulation mechanismAvailableNot available
Feeding deviceAvailableNot available
Crashing mechanismAvailableNot available
CO2 generationNoneGenerated



■ Comparison between KENKI DRYER and rotary dryer / Video





Competitive comparison