Vacuum tube bundle drying system with waste heat for multi-effect evaporation and airflow drying

Abstract

The invention relates to a vacuum tube bundle drying system with waste heat for multiple-effect evaporation and pneumatic drying; the internal of a shell of a tube bundle drying machine is modified to a closed subatmospheric vacuum sealing space; a material is primarily dried under vacuum condition; the tube bundle drying machine generates primary condensed water; secondary steam generated in material drying is introduced in a multiple-effective evaporation system, and serves as a heat source; the secondary steam evaporates other materials in the multiple-effective evaporation system, and is cooled to form secondary condensed water; the secondary condensed water is drained after sewage treatment; ternary steam generated by the multiple-effective evaporation system enters a surface condenser, and is cooled to form ternary condensed water; the primary and ternary condensed water is fed in an air heat exchange system; the air heat exchange system absorbs afterheat in the condensed water; the afterheat is used for secondarily drying a 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 multi-effect evaporation and 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 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. 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 ...

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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