The Komline-Sanderson Biosolids Drying System uses indirect drying technology to convert municipal and industrial biological sludge into a sterile, free flowing granular product. The dried biosolids can be beneficially reused as a slow release nitrogen fertilizer, soil amendment additive or as a green fuel in a boiler and cement kiln. The K-S Biosolids Drying System produces an EPA classified Class A Biosolids.
The K-S Paddle Dryer is used worldwide for the drying of biosolids and biological sludges. The first Komline-Sanderson United States municipal biosolids installation was commissioned in 1991. Since the early 90's Komline-Sanderson has also sold and commissioned many industrial biological sludge dryers.
The K-S Paddle Dryer provides a reliable and efficient method for drying filter cakes and centrifuge concentrates. The K-S Paddle Dryer is indirectly heated with steam or thermal fluid (hot oil). High-energy efficiencies and low off-gas quantities are characteristics of a K-S System.
The K-S Paddle Dryer is an indirect heat transfer device that utilizes mechanical agitation to enhance contact with the product being dried. Dual counter-rotating shafts with unique intermeshing wedge-shaped paddles produce intimate mixing, optimize heat transfer, and provide a self-cleaning effect.
A large heat transfer area to volume ratio is achieved by the use of hollow paddles and a jacketed vessel, through which the heating medium flows. The result is an efficient, compact machine with less space requirements and lower installation cost.
Indirect dryers have a metal wall that separates the process mass from the heat source. High thermal efficiency is obtained because the heat from the thermal medium goes directly into the process mass. As the material comes into contact with the heated trough and agitators, the process mass is heated via conduction. The insulated dryer has very little heat loss.
The K-S Paddle Dryer transports material, regardless of its handling characteristics. Pre-conditioning the feed by mixing with recycled dried product, to make it conveyable, is not required. This results in a safer operation and lower capital, operating, and maintenance cost.
As sludges dry they go through a number of transitions in handling characteristics. These changes are directly related to the solids content. For example, extremely wet sludges and extremely dry sludges require substantially less torque than sludges in the plastic-sticky-phase, when high torque is required. The K-S Paddle Dryer is designed with high torque capabilities to increase its process flexibility. Extra torque keeps you on-line, even during upset conditions.
Material is conveyed through the K-S Paddle Dryer by displacement. As material is added to the dryer, it is assimilated into the bed by the mixing action of the agitators. Hydraulic head pressure, combined with the action of the wedge-shaped paddles, pushes material around and through the paddles.
No external sweep gas is required. Exhaust gas is minimal and at a low temperature. Therefore, the volume of non-condensable gas from the dryer, which requires treatment for odors, is minimal.
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