Abstract:
The invention discloses method and system of drying renewable sources of energy and raw material. The drying process is carried out under partial vacuum conditions and at lower temperatures than conventional dryers. The temperature to dry the material and the rate of water removal are controlled by regulating the degree of vacuum and the intensity of heat input. A method for drying material to moisture content below 10% by weight, comprises introducing into an ejector a stream with a pressure above ambient pressure, creating partial vacuum in a drying chamber through the secondary nozzle of the ejector when the stream enters the ejector and provides the motive pressure to the primary nozzle of the ejector, said drying chamber having an inlet into which a wet material is introduced and an outlet for taking out the dried material after the drying treatment, drying the wet material using low temperature waste heat.
Abstract:
A system according to the present invention provides a radiant conveyor drying system and method of operation. The radiant conveyor drying system generally comprises an input assembly, a drying assembly and an exit assembly mechanically fixed to one another. The drying assembly comprising at least one drying unit in communication with one another to provide for passage of product between the respective drying units and the input assembly and the exit assembly. The drying unit comprising a conveyor belt and a drying unit heating assembly. The drying unit heating assembly comprising a plenum and a heating chamber. The drying unit further comprising a burning unit in communication with the heating chamber to provide for radiant heat to contact the product traveling on the conveyor through the drying unit. The drying unit further comprising a blower fan in communication with the plenum to provide for convective air advancing from the plenum, over and through the radiant heat, to the product. Wherein the radiant heat is disbursed throughout the product. A first embodiment of the invention controlling hear generated by the burning unit of each respective drying unit. A second embodiment of the invention controlling heat generated by the burning unit and rate of the conveyor of each respective drying unit. A method of operation of the radiant conveyor drying system is described.
Abstract:
An apparatus for removing liquid from a suspension comprises: one or more drying chambers; a conveyor system for transporting the suspension through the drying chambers at a substantially continuous speed, including a semi-permeable conveyor belt; a blower for injecting air into the drying chambers; a vacuum pipe and one or more vacuum pipe segments that extend from the vacuum pipe into each of the drying chambers for drawing saturated air out of each of the drying chambers, and wherein the vacuum pipe is operably connected to an intake of the blower. The apparatus may further comprise a condenser receiving the saturated air from the vacuum pipe, cooling the saturated air, and collecting liquid from the saturated air before returning it to the blower. The apparatus may further comprise a preheating arrangement in which cooled air exiting the condenser is passed through the drying chambers before returning it to the blower.
Abstract:
There is provided a multi-module counterflow drying apparatus (100) for drying material, the apparatus (100) comprising: a material inlet (102); a material outlet (104); a heat inlet (108) for inputting heat to the apparatus such that the heat traverses the apparatus in the opposite direction than the material; and a plurality of mutually interchangeable modules (110) stacked on top of each other, wherein the material is configured to move in the apparatus from one module to another such that the movement direction of the material in a given module is opposite to the movement direction of the material in a module above or below, wherein each module (110) comprises: movable paddles (210) configured to discontinuously move the material forward in the module (110).