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Paper pulp continuous-replacement boiling process

A technology for replacing cooking and pulp, which is applied in the direction of digesters, papermaking, textiles and papermaking, etc. It can solve the problems of large workshop area, high equipment investment, and pressure damage of inner tanks.

Inactive Publication Date: 2011-11-23
曲传武 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the sleeve tank is used, when the internal and external pressure is uneven or the pressure caused by the internal and external liquid storage is easy to cause the inner tank to be damaged by pressure
[0009] Although this method effectively saves heat energy, a large-volume liquid storage tank is installed between each cooking pot, which will result in a larger workshop area and higher equipment investment

Method used

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  • Paper pulp continuous-replacement boiling process
  • Paper pulp continuous-replacement boiling process
  • Paper pulp continuous-replacement boiling process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0138] There are seven process steps in the whole cooking cycle:

[0139] one

two

three

Four

Fives

six

seven

cycle

Pot

primary cooking

intermediate cooking

steam heating

insulation

Alkali recovery replacement

put the pot

total time

25min

40min

40min

20

60min

40min

15min

240min

[0140] The replacement amount is as follows:

[0141]

[0142]

[0143] When replacing

[0144] V21+V22- remaining space in the pot=V23+V24

[0145] V31+V32=V33+V34

[0146] V61=V63+V64

[0147] V31=V63, the hot black liquor V31 input to the intermediate cooking pot comes from the hot black liquor V63 displaced during alkali recovery and replacement.

[0148] V21=V33, the hot black liquor V21 input to the primary cooking pot comes from the hot black liquor V33 displaced by the intermediate cooking pot.

[0149] 1. Fill pot B (30min)

[0150] The cold black liquor (abou...

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Abstract

The invention relates to a paper pulp continuous-replacement boiling process. The purpose of the invention is to save energy and to eliminate the environmental pollution of exhaust gas during pot discharging. The scheme of the invention is that: a plurality of boiling pots forms a temperature gradient and is in procedures with different boiling periods; when one of the boiling pot reaches a boiling end point and needs pot discharging treatment, high-temperature boiling liquid in the pot is discharged into a next pot; boiling liquid in the next pot is discharged into a further next pot, that is, boiling liquid in each pot is replaced circularly; after the replacement, each on-off device is closed simultaneously; a subsequent procedure is continued, waiting for the next replacement time. The process of the invention effectively uses the boiling heat energy, has the characteristics of both intermittent and continuous boiling, simplifies the process flow of continuous replacement boiling, and simplifies the operation steps.

Description

technical field [0001] The invention relates to a pulp continuous displacement cooking process, which uses traditional vertical pot cooking equipment combined with continuous cooking technology to make fiber raw materials into pulp, and achieves the goals of energy saving, environmental protection, improving output and quality, and reducing consumption. The invention belongs to the technical field of pulping in the papermaking industry. Background technique [0002] At present, in pulp production, more than 90% of the production enterprises still use the traditional single-pot cooking method. First, the pot is installed in a low-temperature environment, and the heat source is used to heat the cooking pot to 170°C for heat preservation. When the H factor (the temperature during the cooking process After the relative reaction rate with time) reaches the requirement, the slurry in the cooking pot can be discharged to complete the cooking of a pot of pulp. Because in this metho...

Claims

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Application Information

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IPC IPC(8): D21C7/00D21C7/12
Inventor 曲传武
Owner 曲传武
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