Device used for drying materials by aid of low-pressure superheated steam

Abstract

The invention relates to a device with a material drying function. Low-pressure superheated steam is generated when wet materials are dried, and the low-pressure superheated steam is used as internal circulating drying media to realize the material drying function of the device. An external heat-conducting oil circulating system supplies high-temperature heat-conducting oil to be used as a heat transfer medium of the drying device, the low-pressure superheated steam in reheating cycle is used as a partial drying medium of the drying device, the two working media at different temperatures supply heat required by the heating device, steam evaporated in a material drying process and the low-pressure superheated steam which is in pressurization and reheating and then enters the drying device to realize internal circulation are heated by a built-in heat-conducting oil heating coil, accordingly, the steam is always properly superheated in a heat exchange process, the low-pressure superheated steam in the drying device directly contacts with materials moving from top to bottom when the low-pressure superheated steam flows from bottom to top, and purposes of heating and drying the materials are achieved by means of convection heat exchange and mass transfer diffusion between the steam and the materials.

Description

technical field [0001] The invention relates to a device for drying materials with low-pressure superheated steam. Specifically, the internal heating method of the drying device is used to heat and generate low-pressure superheated steam in the process of drying wet materials and use it as an internal circulation drying medium. The drying medium flows from bottom to bottom. The upper flow is in direct contact with the material moving from top to bottom, through the convective heat transfer and mass transfer diffusion between the two, the purpose of heating and drying the material is achieved, and at the same time, the drying process achieves good drying quality, safety, high efficiency and energy saving and environmental friendliness. technical background [0002] As an important technology in product processing, drying has been widely used in chemical industry, energy, medicine, food, agriculture, mining and environmental protection and other fields. [0003] Direct heatin...

AI Technical Summary

Problems solved by technology

The main equipment in this technology is the rotary dryer, which is a type of rotating equipment. The internal space of the rotary dryer is very limited, and it is impossible to arrange a large number of heat exchange tubes in it, so it is difficult to use the saturated steam in the heat exchange tube to exchange heat through condensation. , to provide enough heat and high temperature conditions for the low-temperature steam generated in the drying process to make it become superheated steam

If it cannot ensure that the mixed steam in the dryer is always superheated steam, the drying efficiency of the dryer and the dryness of the material will be affected

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