A drying apparatus for granular materials in which granular materials in a drying tank are heated and dried; the drying apparatus includes a moving mechanism to move the granular materials in the drying tank; and a control section to control the moving mechanism so as to move the granular materials in the drying tank upon determining that temperature of the granular materials around a heating portion in the drying tank exceeds a glass transition temperature.

A process for drying polymeric granular material (2) comprises the steps of: introducing into said drying hopper (10) a process gas having a predefined flow rate so as to heat and dry the polymeric granular material, discharging a portion of the heated polymeric granular material into a transformation unit (100) for the polymeric material; loading an amount of fresh polymeric granular material (2a) into the drying hopper. The process gas flow rate is regulated by measuring the inlet temperature of the fresh polymeric granular material (2a) and comparing it with a predefined inlet temperature of the fresh polymeric granular material, on the basis of which the predefined process gas flow rate has been calculated. If the measured inlet temperature is different from the predefined inlet temperature, the flow rate of the process gas is regulated on the basis of the measured inlet temperature.

A process for drying polymeric granular material (2) comprises the steps of: introducing into said drying hopper (10) a process gas having a predefined flow rate so as to heat and dry the polymeric granular material, discharging a portion of the heated polymeric granular material into a transformation unit (100) for the polymeric material; loading an amount of fresh polymeric granular material (2a) into the drying hopper. The process gas flow rate is regulated by measuring the inlet temperature of the fresh polymeric granular material (2a) and comparing it with a predefined inlet temperature of the fresh polymeric granular material, on the basis of which the predefined process gas flow rate has been calculated. If the measured inlet temperature is different from the predefined inlet temperature, the flow rate of the process gas is regulated on the basis of the measured inlet temperature.

A drying plant (1) for granular polymer material based on polyethylene terephthalate (PET) comprises a hopper (2), which the granular polymer material is dried and a supply and recirculation circuit (10) for a process gas which is provided to dry the granular polymer material and comprising a catalysing group (25) which is configured to promote a decomposition reaction of contaminating substances which are present in the process gas and which are released from the granular polymer material in the hopper.

A recovery system for recovering plastic recycling material includes at least one rinsing chamber designed for heating and rinsing the plastic recycling material and having a rinsing air feed for feeding heated rinsing air into the at least one rinsing chamber; and at least one cooling chamber designed for cooling the plastic recycling material and having a cooling air feed for feeding cooling air into the at least one cooling chamber. The at least one cooling chamber is connected downstream of the at least one rinsing chamber and is fluid-connected to the rinsing air feed via an exhaust air line in such a manner that the exhaust air heated in the at least one cooling chamber by the plastic recycling material can be fed into the rinsing air feed of the at least one rinsing chamber. Use of such recovery system and method for recovering plastic recycling material.

Systems for drying granular materials, such as resin granulates, powdered materials, and agricultural grains, can include a storage vessel for holding the granular material; a drying hopper having a body defining an interior volume configured to receive the granular material; a diffuser configured to direct process air into the interior volume; a vacuum source for transferring the granular material from the storage vessel and to the drying hopper; and a moisture sensor for determining a moisture content of the granular material at a location upstream of the drying hopper. At least one of the residence time of the granular material within the drying hopper, and the temperature, humidity, and flow rate of the process air are regulated based on the moisture content of the granular material measured upstream of the drying hopper at, for example, the storage vessel.

Systems for drying granular materials, such as resin granulates, powdered materials, and agricultural grains, can include a storage vessel for holding the granular material; a drying hopper having a body defining an interior volume configured to receive the granular material; a diffuser configured to direct process air into the interior volume; a vacuum source for transferring the granular material from the storage vessel and to the drying hopper; and a moisture sensor for determining a moisture content of the granular material at a location upstream of the drying hopper. At least one of the residence time of the granular material within the drying hopper, and the temperature, humidity, and flow rate of the process air are regulated based on the moisture content of the granular material measured upstream of the drying hopper at, for example, the storage vessel.

A process and plant for drying of wood shavings, wood chips or other solid materials of organic and/or mineral origin in small pieces, in whichthe material is predried by means of a first preheated drying gas in a first drying step,the dried material from the first drying step is dried by means of a second preheated drying gas in a second drying step,ambient air is heated and supplied as second preheated drying gas to the second drying step,the dried material from the second drying step is cooled by means of a cooling gas, andthe cooling gas heated by cooling of the material and/or the second drying gas cooled in the second drying step is supplied as first drying gas to the first drying step.

A process and plant for drying of wood shavings, wood chips or other solid materials of organic and/or mineral origin in small pieces, in whichthe material is predried by means of a first preheated drying gas in a first drying step,the dried material from the first drying step is dried by means of a second preheated drying gas in a second drying step,ambient air is heated and supplied as second preheated drying gas to the second drying step,the dried material from the second drying step is cooled by means of a cooling gas, andthe cooling gas heated by cooling of the material and/or the second drying gas cooled in the second drying step is supplied as first drying gas to the first drying step.

A process for ore moisture removal by exposure of the ore to a hot and dry air stream is described. Also described is a conveyor belt and a transfer chute adapted for the use of the above process. Among other aspects, the process has the function of reducing moisture in ores prior to the shipping stage of this material.