A drying system for paper production and its drying method

Abstract

The invention relates to a drying system for paper production and a drying method thereof, comprising a drying cylinder for wet paper sheets to pass through, at least two air hoods arranged on the periphery of the drying cylinder, heating devices corresponding to each air hood, and connecting each The air supply system between the heating device and each gas hood is characterized in that it includes a waste heat recovery system for recovering the hot air in each gas hood and returning it to the heating device; the beneficial effect of the present invention is that the hot air can be The waste heat is recovered to ensure the utilization rate of resources. Not only that, the use of the air supply system can further improve the drying effect and drying efficiency of wet paper sheets.

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 ...

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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: the impact coverage is narrow or the impact force is insufficient, etc.), which easily affects the drying effect on the paper

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