Oxygen-based high-efficiency clean bleaching pulp preparation method and device thereof

A pulp and high-efficiency technology, used in pulp bleaching, cellulose pulp post-processing, papermaking, etc., can solve problems such as non-bleaching, and achieve uniform bleaching effect, obvious mass transfer efficiency, and efficient mixing.

Active Publication Date: 2019-01-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problem that the existing technology is difficult to meet the high-efficiency reaction requirements of oxygen bleaching and ozone bleaching, and overcome the shortcomings of being unable to carry out oxygen-based bleaching of medium-consistency pulp to high brightness under high-intensity turbulent conditions

Method used

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  • Oxygen-based high-efficiency clean bleaching pulp preparation method and device thereof
  • Oxygen-based high-efficiency clean bleaching pulp preparation method and device thereof
  • Oxygen-based high-efficiency clean bleaching pulp preparation method and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Oxygen delignified pulp preparation:

[0082] (1) Pot loading: remove the cover body 10, select and install the corresponding hollow mixing rotor 13 according to the pulp consistency characteristics of the pulp to be bleached; choose the hollow mixing rotor 13 with linear blades for low consistency and medium consistency bleaching, and choose the hollow mixing rotor 13 for high consistency bleaching Hollow mixing rotor 13 with helical blades; add an appropriate amount of dry slurry, install cover 10, insert aeration tube 14 into the center of hollow mixing rotor 13, and use end cover bolts 7 to tighten cover 10 and mixing reaction chamber 16 solid seal.

[0083] (2) Adjust the slurry concentration: turn on the liquid medicine pump 2, pump a corresponding volume of dilution water through the liquid inlet pipe 1 and the aeration pipe 14, turn on the frequency converter 25, and use a medium and low speed of 800-1500r / min to mix and adjust the concentration , adjust the pu...

Embodiment 2

[0102] Oxygen delignified pulp preparation:

[0103] (1) Pot loading: remove the cover body 10, select and install the corresponding mixing rotor 13 according to the pulp consistency characteristics of the pulp to be bleached, choose a linear hollow rotor for low-consistency and medium-consistency bleaching, and select a spiral hollow rotor for high-consistency bleaching; Add an appropriate amount of dry slurry, install the cover body 10, insert the aeration tube 14 into the center of the rotor 13, and use the end cover bolts 7 to fasten and seal the cover body 10 and the mixing reaction chamber 16.

[0104] (2) Adjust slurry concentration: turn on liquid medicine pump 2, pump a corresponding volume of dilution water through liquid inlet pipe 1 and aeration pipe 14, turn on frequency converter 25, use a medium speed of 1500r / min, mix and adjust the concentration, and adjust the mixing The slurry to be bleached in the reaction chamber 16 is 14% in medium concentration or 30% in...

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Abstract

The invention discloses an oxygen-based high-efficiency clean bleaching pulp preparation method and a device thereof. A hollow hybrid rotor in the device is connected to the shaft end of a high-speedvariable frequency motor spindle located at the bottom of a mixing reaction chamber by bolts. Blades of the hollow hybrid rotor are a plurality of linear or spiral blades distributed symmetrically ina hollow structure. The method is widely used in oxygen bleaching or ozone bleaching of chemical pulp of any raw material. All use oxygen-containing bleaching agents. Final products decomposed from the chemical reaction are oxygen and water, and the residual of harmful substances in the bleached pulp is eliminated. The bleached pulp is high in whiteness, more uniform and not prone to return to yellow. A variable frequency motor drives the hollow rotor to conduct high speed mixing through the spindle and a mechanical seal, so that medium- and high-concentration pulp and an oxygen-based gaseousbleaching agent in the mixed reaction chamber are more efficient in mass transfer. The mixed contact is more uniform and sufficient. The device is reasonable in structure, can accurately control consumption of liquid, oxygen and ozone and simple and efficient in the bleached pulp preparation process.

Description

technical field [0001] The invention relates to the technical field of pulping and papermaking, in particular to an oxygen-based high-efficiency clean bleached pulp preparation method and a device thereof. Background technique [0002] Due to the constraints of resources, environment, and benefits, the pulp and paper industry continues to develop towards a modern large-scale industry with high efficiency, high quality, low consumption, low pollution, and low emissions. In recent years, my country has issued a series of strict policies and regulations to achieve the sustainable development of pulp and paper, continuously promote enterprise technology upgrading, energy conservation and emission reduction, pollution prevention and control, clean production, and accelerate the promotion of oxygen delignification, ozone bleaching, ECF element-free Wide application of technologies such as chlorine bleaching and TCF chlorine-free bleaching. [0003] Oxygen is a common oxidizing age...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C9/147D21C9/153D21C9/10
CPCD21C9/1026D21C9/1031D21C9/147D21C9/153Y02P70/10
Inventor 李军张希莫立焕徐峻龚杰匡奕山李霞栾鹏程
Owner SOUTH CHINA UNIV OF TECH
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