Drying system for paper production, and drying method thereof

Abstract

The invention relates to a drying system for paper production, and a drying method thereof. The drying system comprises a drying cylinder for wet paper sheets to pass through, at least two gas hoods arranged on the periphery of the drying cylinder, heating devices corresponding to the gas hoods and an air supply system communicated between the heating devices and the gas hoods, and the drying system also comprises a waste heat recovery system used for recovering hot air in the gas hoods and returning the hot air into the heating devices. Waste heat recovery can be conducted on hot air, so theutilization rate of resources is guaranteed; and in addition, the drying effect and the drying efficiency of the wet paper sheets can be further improved through the air supply system.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a drying system for paper production and a drying method thereof. Background technique [0002] In the papermaking industry, a drying device (such as a drying cylinder) is usually provided, which is mainly used to dry the wet paper sheet formed by the forming section, so as to obtain a paper sheet with a low moisture content. [0003] Today's drying device is mainly composed of a drying cylinder and an air hood. During the drying process, high-temperature and high-pressure steam (or hot air) is input into the inside of the drying cylinder and the air hood to dry the wet paper sheets passing through the drying cylinder. The heat of the high-temperature steam inside the dryer evaporates the water on the wet paper leaves, and uses the high-temperature hot air of the air hood to impact the wet paper, taking away the evaporated water while drying the paper, and then, this part of ...

AI Technical Summary

Problems solved by technology

[0003] Today's drying device is mainly composed of a drying cylinder and an air hood. During the drying process, high-temperature and high-pressure steam (or hot air) is input into the inside of the drying cylinder and the air hood to dry the wet paper sheets passing through the drying cylinder. The heat of the high-temperature steam inside the dryer evaporates the water on the wet paper leaves, and uses the high-temperature hot air of the air hood to impact the wet paper, taking away the evaporated water while drying the paper, and then, this part of the high-temperature hot air takes away the paper There will still be high waste heat after the moisture is removed, but at present, this part of the hot air is directly discharged outside, resulting in a great waste of energy;

[0004] In addition, the impact effect of the hot air entering the air hood on the paper is poor (for example: narrow impact coverage or insufficient impact force, etc.), which can easily affect the drying effect on the paper

Images