Vacuum tube bundle drying system with waste heat for pneumatic drying

Abstract

The invention relates to a vacuum tube bundle drying system with waste heat for and pneumatic drying; the internal of a shell of a tube bundle drying machine is modified to a closed subatmospheric vacuum sealing space; a powder material is primarily dried under vacuum condition; the needed drying temperature is effectively lowered; meanwhile, after secondary steam generated in drying of the powder material is washed to remove dust, the secondary steam is cooled and condensed to form secondary condensed water; the secondary condensed water, circular cooling water for condensing of the secondary steam and primary condensed water generated in steam condensation are all conveyed to an air heat exchanger; the air heat exchanger absorbs afterheat in the primary condensed water and the secondary condensed water; the afterheat is used for secondarily drying the powder material dried by the tube bundle drying machine; the secondary drying enables the material drying to become more thorough and uniform; the afterheat is recycled; the energy is recycled; the energy is saved; and the emission is reduced.

Description

Technical field: [0001] The invention belongs to the technical field of drying equipment for loose materials such as powders and granules, and in particular relates to a vacuum tube bundle drying system in which waste heat is used for airflow drying. Background technique: [0002] At present, in the fields of starch industry and feed processing industry, when drying powder materials, the drying equipment used is still tube bundle dryer, which is an indirect heating contact dryer. The reducer drives the tube bundle to rotate, and the powder material enters the dryer from the feed port through the feed auger, and the powder material is picked up by the lifting plate installed on the periphery of the tube bundle, and continuously pushed from the feed port to the discharge port At one end, the powder material is picked up to the top by the lifting board and then falls into the tube bundle under the action of gravity. The high-temperature steam enters the tube bundle tube from...

AI Technical Summary

Problems solved by technology

[0003]However, the heat source used in the existing tube bundle dryer is high-temperature raw steam, and the dried materials will be scorched due to the high drying temperature, resulting in The quality of the material is degraded. The waste steam produced by drying and wet materials contains burnt smell, and the waste steam contains dust and other pollutants, which will cause pollution if it is directly discharged into the atmosphere.

The heat in the condensed water of the waste steam from the drying of the material and the raw steam used for tube bundle drying is not recycled, resulting in a waste of energy

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