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Tri-displacement cooking method

A technology for replacing cooking and cooking pots, which is applied in textiles, papermaking, and fiber raw material processing. It can solve the problems of increasing equipment manufacturing and maintenance costs, achieve significant energy saving and chemical saving, increase the amount of pots installed, and shorten the replacement path. Effect

Active Publication Date: 2015-04-01
杨安庆 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Or add an inner cylinder in the black liquor tank like some upflow displacement processes, which will also increase equipment manufacturing and maintenance costs

Method used

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  • Tri-displacement cooking method

Examples

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Effect test

Embodiment 1

[0037]A three-displacement cooking method, comprising the following steps:

[0038] Liquid immersion filling step: put the tablet into the cooking pot, and when the tablet is loaded, start to deliver the prepreg into the cooking pot. The liquid process ends, and the blank loading process and the prepreg liquid delivery process end at the same time;

[0039] Warm black liquor replacement step: use the warm black liquor from the upper part of the warm black liquor tank to replace the presoak liquid in the cooking pot, and after the replacement, the temperature of the liquid in the cooking pot is raised to 110°C;

[0040] Hot black liquor replacement step: use hot black liquor to replace warm black liquor in the cooking pot, after replacement, the temperature of the liquid in the cooking pot is raised to 140°C;

[0041] Heating and cooking steps: use 0.9MPa medium-pressure steam to heat the feed liquid in the cooking pot after the hot black liquor replacement step to the preset ...

Embodiment 2

[0053] A three-displacement cooking method, comprising the following steps:

[0054] Liquid immersion filling step: put the tablet into the cooking pot, and when the tablet is loaded, start to deliver the prepreg into the cooking pot. The liquid process ends, the tablet loading process and the prepreg liquid delivery process do not end at the same time, and the tablet loading process ends 5-10 minutes earlier than the prepreg liquid delivery process;

[0055] Warm black liquor replacement step: use the warm black liquor from the upper part of the warm black liquor tank to replace the presoak liquid in the cooking pot, after the replacement, the temperature of the liquid in the cooking pot is raised to 125°C;

[0056] Hot black liquor replacement step: use hot black liquor to replace warm black liquor in the cooking pot, after replacement, the temperature of the inner material liquid in the cooking pot is raised to 150°C;

[0057] Heating and cooking steps: use 1.0MPa medium p...

Embodiment 3

[0069] A three-displacement cooking method, comprising the following steps:

[0070] Liquid immersion filling step: put the tablet into the cooking pot, and when the tablet is loaded, start to deliver the prepreg into the cooking pot. The liquid process ends, the blank loading process and the prepreg liquid delivery process do not end at the same time, and the blank loading process ends 5-10 minutes later than the prepreg liquid delivery process;

[0071] Warm black liquor replacement step: use the warm black liquor at the upper part of the warm black liquor tank to replace the presoak liquid in the cooking pot, and after the replacement, the temperature of the liquid in the cooking pot is raised to 140°C;

[0072] Hot black liquor replacement step: use hot black liquor to replace warm black liquor in the cooking pot, after replacement, the temperature of the inner material liquid in the cooking pot is raised to 160°C;

[0073] Heating and cooking steps: Use medium-pressure s...

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Abstract

The invention discloses a tri-displacement cooking method. The tri-displacement cooking method comprises the following steps: an immersion potting step, a warm black liquor displacement step, a hot black liquor displacement step, a heating and cooking step, a washing liquor displacement step and a pulping discharging step. The tri-displacement cooking method is improved aiming at the existing bi-displacement technique, three sections of displacement of black liquor can be realized on the basis of not increasing the investment cost, a warm black liquor groove applicable to displacement and cooking, filed by the applicant at the same time, is matched with a hot black liquor groove for the purose of use, the warm black liquor displacement step is added, the two sections of black liquor displacement process are changed into three sections of displacement, and the tri-displacement cooking method has the comprehensive advantages of being economic in investment, good in pulp quality and energy-saving and reduces sewage; and the tri-displacement cooking method is especially suitable for medium-sized and small enterprises which have special requirements on the pulping viscosity or needs of upgrading the traditional cooking device into the displacement cooking device by adopting the traditional bleaching technology.

Description

technical field [0001] The invention relates to a pulping method in the papermaking industry, in particular to a three-displacement cooking method. Background technique [0002] In the currently disclosed displacement cooking methods, there are two methods of black liquor displacement under pressure: a double displacement process and an upflow displacement process. The double replacement process is to allow the replacement liquid to enter from the upper and lower parts of the cooking pot, and the reflux liquid to be replaced is discharged from the sieve plate in the middle of the cooking pot. The process of the up-flow replacement method is to let the replacement liquid enter from the lower part of the cooking pot, and the reflux liquid is discharged from the upper sieve plate of the cooking pot. Compared with the up-flow displacement method, the double displacement method has a shorter displacement path and relatively lower displacement resistance, so a slightly larger dis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C5/00
Inventor 杨安庆范谋斌
Owner 杨安庆
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