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A method for the optimization of evaporation drying of paper, speed, and paper quality and to a drying section of a paper machine for carrying out the method

机译:一种用于对纸张进行蒸发干燥,速度和纸张质量进行优化的方法,并且涉及一种用于执行该方法的造纸机的干燥部

摘要

A method and an equipment for evaporation drying of the paper web that comes from the press section (10) of a paper machine. The method consists of three successive stages I, II and III that are carried out in the direction of progress of the web (W) as follows: (I) in the first stage, the paper web coming from the press section (10) of the paper machine is heated in a short section (L1) of the paper machine in the machine direction quickly to a temperature of 55...85 °C, and web breaks of the relatively moist and, thus, weak web (W) are minimized; (II) after the first stage (I), the main evaporation drying of the web (W) is carried out so that the evaporation efficiency (PE) and the rate of increase in the dry solids content (KA) of the web (W) are substantially higher than in the first stage or in the final stage (III), and the web temperature (TW) does substantially not rise while the drying proceeds (Fig. 4); (III) in the final stage, the drying is continued with a decreasing evaporation efficiency (Fig. 3) and with such an average rate of increase in the dry solids content (KA) of the web (W) in the machine direction as is lower than in the preceding stage (II) but higher than in a conventional cylinder drying with single-wire draw so that the paper quality can be controlled at the same time.
机译:一种来自造纸机压榨部(10)的用于纸幅的蒸发干燥的方法和设备。该方法由三个连续的阶段I,II和III组成,这些阶段是在纸幅(W)的前进方向上进行的,如下所示:(I)在第一阶段中,纸幅来自纸幅的压榨部(10)。造纸机在造纸机的短段(L1)中沿机器方向迅速加热到55 ... 85°C的温度,相对潮湿的纸幅破裂,因此薄纸幅(W)为最小化(II)在第一阶段(I)之后,进行纸幅(W)的主要蒸发干燥,以使纸幅(W)的蒸发效率(PE)和干固含量(KA)的增加速率增加。 )明显高于第一阶段或最后阶段(III),并且在干燥进行时幅材温度(TW)基本不升高(图4); (III)在最后阶段,干燥以降低的蒸发效率继续进行(图3),并且网幅(W)的干燥固体含量(KA)的平均增加速率保持原样。低于前一阶段(II),但高于传统的单线拉丝滚筒干燥,因此可以同时控制纸张质量。

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