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Cooling of a cellulose pulp web

A pulp board and cooling zone technology, applied in pulp dehydration, papermaking, paper machine, etc., can solve the problems of pulp brightness reduction and damage to pulp quality, achieve rapid cooling, rapid adaptation, and reduce the effect of color quality degradation

Active Publication Date: 2013-07-03
ANDRITZ TECH & ASSET MANAGEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such high temperatures have been found to impair the quality of the pulp, resulting in a reduction in pulp brightness during storage of the pulp

Method used

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  • Cooling of a cellulose pulp web
  • Cooling of a cellulose pulp web
  • Cooling of a cellulose pulp web

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0032] figure 1 A cellulose paddle dryer 1 is shown that works according to the air tray principle. Wet cellulose pulp board 2 enters paddle dryer 1 at inlet 4 . Arrow A indicates the direction of travel of the slab 2 through the paddle dryer 1 . The panel 2 is conveyed through a plurality of upper blow boxes 6 and lower blow boxes 8 . The blow boxes 6, 8 blow hot drying air onto the wet plate 2, usually at a temperature of 110-200°C. The dry air blown by the lower blowing box 8 keeps the panel 2 afloat, ie causes the panel 2 to be lifted by the air in the channel between the blowing boxes 6 , 8 . An example of a blower box design can be found in US4719708. Such as figure 1 As shown, the wet board 2 passes through the drying zone 9 of the paddle dryer 1 through a plurality of drying channels. The paddle dryer 1 is provided with a cooling zone 10, which is located downstream of the drying zone 9 and will be described in more detail below. The partition wall 12 separate...

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PUM

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Abstract

A pulp dryer (1) is operative for drying a web (2) of pulp by means of hot air in accordance with the air borne web (2) principle and comprises a cooling zone (10) having a length along which the web (2) is made to travel. The cooling zone (10) comprises a plurality of cooling blow boxes (18, 20) being distributed along the length of the cooling zone (10) and being operative for blowing cooling air towards the web (2). Furthermore, the cooling zone (10) comprises at least one liquid supply device (22, 24) being operative for supplying cooling liquid directly onto the web (2).

Description

technical field [0001] The present invention relates to a paddle dryer operable to dry a pulp board with hot air according to the air tray principle and comprising a cooling zone having a length along which the board travels. [0002] The invention also relates to a method of zone cooling a pulp sheet by advancing the sheet through cooling. Background technique [0003] Pulp for the manufacture of paper and board is usually dried with convection type dryers operating according to the air tray principle. An example of such a dryer is described in US4505053. hot air through the US4505053's Figure 4 The upper blow box and the lower blow box shown in are blown onto the pulp board. The air blown by the blower box transfers heat to the board to dry it, and also keeps the board floating at a steady distance above the lower blower box. Hot air is supplied to the blower box by a gas circulation system (comprising blowers and steam radiators that heat the drying air). An air pall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C9/18D21F5/18F26B13/20
CPCD21C9/18D21G7/00D21F5/187F26B13/10D21F5/18D21F5/188F26B13/104
Inventor M·卡尔松K·桑德布拉德P·霍尔姆伯格
Owner ANDRITZ TECH & ASSET MANAGEMENT