Pressurizing superheat steam drying method and device with inner heater and capable of being reused

Abstract

The invention relates to pressurizing superheat steam drying method and device with an inner heater and capable of being reused, in particular to a novel drying technology which has high efficiency and energy saving and higher energy utilization efficiency except all the advantages of superheat steam drying. The pressurizing superheat steam drying system with the inner heater and capable of being reused comprises a multi-level drying system; drying of each level is pressurizing superheat steam drying; a dryer of each level is a fluidized bed dryer with the inner heater; high-temperature and high-pressure steam needed by drying is only provided for a first-level drying system; energy needed by second-level drying and the drying of other levels is provided by superheat steam generated by previous-level drying; the steam needed by the drying of each level is condensed into condensate water by wet materials in the drying of each level and then discharged out of the drying system; only the steam generated in the last-level drying is discharged out of the drying system in a tail gas way; the steam generated in the drying of each level not only meets the need of self circulation, but also enters the inner heater of the fluidized bed dryer of a next level to provide heat for wet material drying; and steam discharged materials generated in the last-level drying not only meet the need of the self circulation, but also are discharged out of the drying system.

Description

Technical field [0001] The invention relates to a novel drying process with high efficiency and energy saving developed by reusing the steam produced by drying the superheated steam of the first stage in the second stage and subsequent stages of dryers. Background technique [0002] Superheated steam drying is a new type of environmental protection and energy saving drying technology. In superheated steam drying, the material to be dried is in direct contact with superheated steam. It has the advantages of energy saving, emission reduction, prevention of explosion and fire, and good quality of dried products. [0003] In the superheated steam drying process, the gas circulating in the system is superheated steam, in which the wet material is heated and dehydrated by the superheated steam to become steam, and the generated steam circulates in the system, and after being heated by a heat exchanger, it provides heat for Wet materials are dried. The superheated steam beyond t...

AI Technical Summary

Problems solved by technology

[0007] At present, all superheated steam drying is normal pressure superheated steam drying. When the drying system is running, part of it is under negative pressure, and air easily enters the inside of the drying system. Therefore, the proportion of non-condensable gases such as steam and air discharged from the superheated steam drying system is relatively high. , up to 5%-12%, limiting the possibility of its reuse, especially in the drying process

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