Method and device for drying a fibrous web

A fibrous web, drying technology, applied to the machine of cardboard web or tissue paper web, to manufacture fibrous web, to achieve the effect of reducing energy cost

CN102317540AInactive Publication Date: 2012-01-11VOITH PATENT GMBH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2012-01-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method and to a device for drying a fibrous web, wherein the traveling fibrous web is acted upon by steam and hot, moist air in the region of a preceding drying zone (10) and is then fed to the preceding drying zone (10) of a downstream drying zone (12) comprising a drying cylinder (14) and a hood (16) allocated thereto. Hot air (18) is taken out of the hood (16) allocated to the drying cylinder (14) of the downstream drying zone (12). To create at least a portion of the steam for the preceding drying zone (10), condensate and / or fresh water occurring in the drying cylinder (14) of the downstream drying zone (12) is heated by the hot air (18) taken out of the hood (16) by means of a first heat exchanger (20). Alternatively or additionally for creating at least a portion of the hot, moist air for the preceding drying zone (10), the hot air (18) taken out of the hood (16) guided through the first heat exchanger (20) is fed to the preceding drying zone (10).
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Description

technical field

[0001] The invention relates to a method for drying a fibrous web, in particular a board, paper or tissue web, in which the continuous fibrous web is subjected to steam and hot moist air in the area of ​​an upstream drying zone and then The pre-drying zone is then conveyed to a post-drying zone comprising a drying cylinder, in particular a Yankee drying cylinder, and a hood associated with the drying cylinder. The invention also relates to a machine of the type mentioned in the preamble of claim 8 for producing a fibrous web, in particular a paper, cardboard or tissue web. Background technique

[0002] In US7351307B2 and WO2008 / 077874 there have been described methods for making bulky tissue webs and where a so-called Bandpresse in combination with hot air hoods and steam loading is used to dewater the fibrous web to a specific dryness . It is especially important for such tissue paper machines to reduce energy consumption, especially during the drying proc...

Examples

Embodiment Construction

[0034] figure 1 Shows a schematic flow diagram of a first exemplary embodiment of a heat recovery system according to the invention of a machine for producing a fiber web, wherein the fiber web can be, in particular, a cardboard web, a paper web or a tissue paper width.

[0035] In this case, the continuous fibrous web is initially subjected to steam and hot, moist air in the area of ​​the preceding drying zone 10 . The fibrous web is then conveyed into a post-drying zone 12 .

[0036] The preceding drying zone 10 here comprises in particular a suction device 42 , preferably a suction roll, through which the fiber web is guided together with at least one permeable belt, in particular a structured belt or a through-air drying belt. A roll in which steam or hot moist air flows first through a permeable belt and then through a fibrous web.

[0037]Furthermore, the fibrous web can be covered by at least one other permeable belt, especially a press belt, wherein, in this case, s...