CN208328535U - Green bagasse pulp short sequence bleaching technological system - Google Patents

Abstract

A kind of green bagasse pulp short sequence bleaching technological system, including delignification stages D₀With hydrogen peroxide alkaline extraction section E_p, delignification stages D₀Including D₀In dense pump, D₀Heater, D₀Mixer, D₀Pre-reaction tower, D₀Filtrate receiver and D₀Wash engine, the hydrogen peroxide alkaline extraction section E_pIncluding dense pump, filtrate receiver, wash engine in dense pump in first, heater, mixer, upflow tower, downflow tower, second, it is attached according to the order of connection of dense pump → filtrate receiver in dense pump → heater → mixer → upflow tower → downflow tower → the second in first by pipeline.Its advantage is that in D₀Increase by one section of hydrogen peroxide alkali density E after section_pSection, is reducing ClO₂The functional of paper pulp is also able to maintain while usage amount, bleaching process is short, and bleaching effect is good, and structure is simple, in ClO₂And H₂O₂In the lower situation of dosage, the generation of pollutant is not only reduced, the various performances of paper pulp still keep well, working well.

Description

Green bagasse pulp short sequence bleaching technological system

Technical field

The utility model relates to pulp technology for making paper, in particular to a kind of green bagasse pulp short sequence bleaching technological system.

Background technique

As worldwide trend and customer priorities turn to more cleaning and more environmentally friendly product, current paper pulp and paper industry face A significant challenge be using element-free chlorine (ECF) and completely without chlorine (TCF) bleaching technology, reducing noxious material chemicals makes With and pollutional load, have better product quality potentiality.The main purpose of these technologies is reduced or is phased out from drift The use of the elemental chlorine and chlorine based chemistries product of Bai Xulie.The bleaching agent that ECF bleaching uses is mainly chlorine dioxide (ClO₂), it compares In other bleaching agents (chlorine and hypochlorous acid), ClO₂The less pollution to environment is bleached, main reason is that ClO₂It is reduced into Cl^-It can release 5 electronics, and Cl₂It is reduced into Cl^-Only release 2 electronics, therefore ClO₂Oxidability be Cl₂2.5 Times.And compared to ozone or peroxy acid, ClO₂Bleaching process, which can obtain higher pulp brightness, will not also destroy paper Performance.Current chemical wood pulps most of in the world are all using ClO₂Bleaching process, therefore ClO₂Bleaching process is in paper pulp and papermaking Industry has consequence.

ClO₂Bleaching is generally divided into delignification stages (D₀) and brighten section (D₁Or D₂), D₀The main function of section is delignification, and And it also can be reduced the degradation of cellulose and hemicellulose.D1 and D2 sections of effect mainly increases pulp brightness, however at D0 sections ClO₂Substances meeting and the ClO such as furancarboxylic acid derivative are sticked with solubility caused by lignin reaction₂Side reaction occurs, greatly reduces ClO₂Bleaching efficiency, while the production quantity of AOX can also increase therewith.Therefore, we have developed a kind of new ECF short sequence bleachings Technological system, mainly for the bleaching of bagasse pulp.We pass through removal D₁And D₂The bleaching process of section, only retains D₀The de- wood of section Plain process, while in D₀Increase by one section of hydrogen peroxide alkali density (E after section_p) section, reducing ClO₂It can also be protected while usage amount Hold the functional of paper pulp.

Utility model content

The purpose of this utility model is just to provide a kind of bleaching mainly for bagasse pulp, by removing D₁And D₂The drift of section White process, only retains D₀The delignification process of section, while in D₀Increase by one section of hydrogen peroxide alkali density E after section_pSection, is reducing ClO₂The functional of paper pulp is also able to maintain while usage amount, bleaching process is short, and bleaching effect is good, the simply green sugarcane of structure Slurry short sequence bleaching technological system.

The solution of the utility model is such that

A kind of green bagasse pulp short sequence bleaching technological system, including delignification stages D₀, delignification stages D₀Including D₀In it is dense pump, D₀Heater, D₀Mixer, D₀Pre-reaction tower, D₀Filtrate receiver and D₀Wash engine, in delignification stages D₀Hydrogen peroxide alkali is connected after section Extract section E_p, the hydrogen peroxide alkaline extraction section E_pIncluding dense pump, heater, mixer, upflow tower, downflow tower, second in first In dense pump, filtrate receiver, wash engine, according to dense in dense pump → heater → mixer → upflow tower → downflow tower → the second in first Pump → filtrate receiver order of connection is attached by pipeline, wherein in dense pump entrance be connected to D₀The outlet of wash engine is being washed The outlet of pulp grinder is maintained the good bleached pulp of pulp property.

The utility model has the advantages that in D₀Increase by one section of hydrogen peroxide alkali density E after section_pSection, is reducing ClO₂It uses The functional of paper pulp is also able to maintain while amount, bleaching process is short, and bleaching effect is good, and structure is simple, in ClO₂And H₂O₂Dosage In lower situation, the generation of pollutant is not only reduced, the various performances of paper pulp still keep well, working well.

Detailed description of the invention

Fig. 1 is the system structure diagram of the utility model.

In attached drawing: 1, D₀In dense pump, 2, D₀Heater, 3, D₀Mixer, 4, D₀Pre-reaction tower, 5, D₀Filtrate receiver, 6, first In dense pump, 7, heater, 8, mixer, 9, upflow tower, 10, downflow tower, dense pump in 11, second, 12, filtrate receiver, 13, pulp washing Machine, 14, D₀Wash engine.

Specific embodiment

The utility model includes delignification stages D₀, delignification stages D₀Including D₀In dense pump 1, D₀Heater 2, D₀Mixer 3, D₀ Pre-reaction tower 4, D₀Filtrate receiver 5 and D₀Wash engine 14, in delignification stages D₀Hydrogen peroxide alkaline extraction section E is connected after section_p, the mistake Hydrogen oxide alkaline extraction section E_pIncluding dense pump in pump 6 dense in first, heater 7, mixer 8, upflow tower 9, downflow tower 10, second 11, filtrate receiver 12, wash engine 13, according to 9 → downflow tower of dense pump 6 → heater, 7 → mixer, 8 → upflow tower 10 → the in first In two it is dense pump 11 → filtrate receiver 12 the order of connection be attached by pipeline, wherein in dense pump entrance be connected to D₀Wash engine 14 Outlet, be maintained the good bleached pulp of pulp property in the outlet of wash engine 13.

In the present invention, used bleaching process are as follows:

D₀Section ClO₂Dosage be 0-1.2wt%, temperature be 0-65 DEG C；E_pSection H₂O₂Dosage be 0-0.5wt%, temperature 0- 100℃。

To use the utility model to D₀Section and E_pSection system carries out online monitoring continuous for 24 hours, wherein D₀The ClO of section₂Use Amount is 0.8wt%, and temperature is 65 DEG C, E_pSection 0.4wt%, temperature are bleached for being 95 DEG C, obtain the property of on-line continuous monitoring Energy index, time interval 2h.

Claims (1)

1. a kind of green bagasse pulp short sequence bleaching technological system, including delignification stages D₀, delignification stages D₀Including D₀In dense pump, D₀Add Hot device, D₀Mixer, D₀Pre-reaction tower, D₀Filtrate receiver and D₀Wash engine, it is characterised in that: in delignification stages D₀Peroxide is connected after section Change hydrogen alkaline extraction section E_p, the hydrogen peroxide alkaline extraction section E_pIncluding dense pump, heater, mixer, upflow tower, drop stream in first Tower, dense pump, filtrate receiver, wash engine in second, according to dense pump → heater → mixer → upflow tower → downflow tower in first → The order of connection of dense pump → filtrate receiver is attached by pipeline in second, wherein in dense pump entrance be connected to D₀Wash engine goes out Mouthful, it is maintained the good bleached pulp of pulp property in the outlet of wash engine.