Process and apparatus for drying material
AssigneeAndritz-Patentverwaltungs-Gesellscaft m.b.h.
InventorsErwin Brunnmair, Reinhard Pinter
Life of this patent
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Abstract
A process and apparatus for drying material, in which a previous dried material is mixed into the wet material to be dried to produce a dried mixture of different particle sizes. The process for drying material requires less industrial equipment implemented in a more economical and simpler plant that can be operated with low energy and maintenance requirments. The amount of fine material obtained after drying is measured and the amount of fine previously dried material mixed into the wet material to be dried is then set in inverse proportion to the quantity of fine dried material produce.
Claims34
A process for drying a solid-liquid mixture comprising the steps of:
- forming a mixture of a wet material and a previously dried granular material having a predetermined particle size;
- passing said mixture through a drying device to produce a dried product containing a first granular fraction of said granular material, and a second fraction having a particle size greater than said first fraction;
- transferring said first fraction to a storage device and measuring the volume of said first fraction in said storage device produced in said drying step;
- and
- adjusting the amount of said previously dried material mixed with said wet material in relation to the volume of said first fraction obtained from said drying step to produce a predetermined quantity of said first fraction in said drying step.
A process of drying a wet material comprising the steps of:
- feeding a wet material to a mixer at a first rate;
- feeding a previously dried material having a first particle size to said mixer at a second rate and mixing with said wet material to form a mixture;
- drying said mixture in a drier to produce a dried material containing a mixture of said first particle size material and a dried material having a second particle size larger than said first particle size;
- separating said material of said first particle size from said dried mixture and conveying said material of first particle size to a storage device, and measuring the amount of said material in said storage device;
- recycling said material of first particle size in said storage device to said mixer for mixing with said wet material;
- and
- adjusting said second feed rate of said previously dried material to said mixer in response to said measured amount of dried material in said storage device.
A drying apparatus for drying a wet material comprising:
- a mixer for mixing a wet material and previously dried material;
- a first feeder for feeding a wet material to said mixer at a first feed rate;
- a second feeder for feeding a dried material of a first particle size to said mixer at a second feed rate;
- a drier for drying said mixture of wet and previously dried material to produce a mixture of dried material of said first particle size and a dried material having a second particle size greater than said first particle size;
- a storage device for receiving said dried material of said first particle size, said storage device including a level sensing device for measuring the level of material therein;
- a conveyor for conveying said dried material of said first particle size in said storage device to said second feeder;
- and
- a control device operatively connected to said first and second feeders and to said level sensing device for adjusting the second feed rate of said second feeder in response to a level of dried material in said storage device.
Dependencies are inferred from the claim text.