CN104169493B - A kind of method and system processing liquid flow in chemical pulp mills - Google Patents
A kind of method and system processing liquid flow in chemical pulp mills Download PDFInfo
- Publication number
- CN104169493B CN104169493B CN201380014049.6A CN201380014049A CN104169493B CN 104169493 B CN104169493 B CN 104169493B CN 201380014049 A CN201380014049 A CN 201380014049A CN 104169493 B CN104169493 B CN 104169493B
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- China
- Prior art keywords
- water
- chloride content
- facility
- low chloride
- process water
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- 238000000034 method Methods 0.000 title claims abstract description 219
- 229920001131 Pulp (paper) Polymers 0.000 title claims abstract description 48
- 239000007788 liquid Substances 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 202
- 230000008569 process Effects 0.000 claims abstract description 168
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 95
- 238000004061 bleaching Methods 0.000 claims abstract description 71
- 239000002351 wastewater Substances 0.000 claims abstract description 35
- 238000005406 washing Methods 0.000 claims abstract description 32
- 238000009835 boiling Methods 0.000 claims abstract description 19
- 238000000746 purification Methods 0.000 claims description 36
- 239000000126 substance Substances 0.000 claims description 34
- 238000005516 engineering process Methods 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 14
- 239000000835 fiber Substances 0.000 claims description 13
- 238000011084 recovery Methods 0.000 claims description 9
- 239000002023 wood Substances 0.000 claims description 8
- 238000001704 evaporation Methods 0.000 claims description 7
- 230000008020 evaporation Effects 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 238000005352 clarification Methods 0.000 claims description 4
- 239000000498 cooling water Substances 0.000 claims description 4
- 239000002699 waste material Substances 0.000 claims description 4
- 230000029087 digestion Effects 0.000 claims description 3
- 238000005189 flocculation Methods 0.000 claims description 3
- 230000016615 flocculation Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 238000001728 nano-filtration Methods 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims description 2
- 238000004659 sterilization and disinfection Methods 0.000 claims description 2
- 239000013589 supplement Substances 0.000 description 28
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 22
- 229910052760 oxygen Inorganic materials 0.000 description 15
- 239000001301 oxygen Substances 0.000 description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 13
- 239000000460 chlorine Substances 0.000 description 12
- 239000012071 phase Substances 0.000 description 12
- 239000002002 slurry Substances 0.000 description 12
- 239000004155 Chlorine dioxide Substances 0.000 description 11
- 229920005610 lignin Polymers 0.000 description 10
- 239000002253 acid Substances 0.000 description 9
- 239000011575 calcium Substances 0.000 description 9
- 229910052801 chlorine Inorganic materials 0.000 description 9
- 235000019398 chlorine dioxide Nutrition 0.000 description 9
- 238000010926 purge Methods 0.000 description 8
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 150000001399 aluminium compounds Chemical class 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 239000000701 coagulant Substances 0.000 description 4
- 238000012216 screening Methods 0.000 description 4
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 3
- 229920002472 Starch Polymers 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- -1 chloride inorganic compound Chemical class 0.000 description 3
- 238000005660 chlorination reaction Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 239000000706 filtrate Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 150000002978 peroxides Chemical class 0.000 description 3
- 229920002401 polyacrylamide Polymers 0.000 description 3
- 230000029219 regulation of pH Effects 0.000 description 3
- 239000008107 starch Substances 0.000 description 3
- 235000019698 starch Nutrition 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 3
- 239000003643 water by type Substances 0.000 description 3
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 description 2
- 239000004912 1,5-cyclooctadiene Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010411 cooking Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- GQOKIYDTHHZSCJ-UHFFFAOYSA-M dimethyl-bis(prop-2-enyl)azanium;chloride Chemical compound [Cl-].C=CC[N+](C)(C)CC=C GQOKIYDTHHZSCJ-UHFFFAOYSA-M 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 238000000265 homogenisation Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 239000006210 lotion Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 150000004045 organic chlorine compounds Chemical class 0.000 description 2
- 229920000768 polyamine Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000004076 pulp bleaching Methods 0.000 description 2
- 238000004537 pulping Methods 0.000 description 2
- 125000001453 quaternary ammonium group Chemical group 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 238000009287 sand filtration Methods 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- 229920002488 Hemicellulose Polymers 0.000 description 1
- 229920000209 Hexadimethrine bromide Polymers 0.000 description 1
- 229910021577 Iron(II) chloride Inorganic materials 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 206010033546 Pallor Diseases 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229940037003 alum Drugs 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910000329 aluminium sulfate Inorganic materials 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 235000011128 aluminium sulphate Nutrition 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003593 chromogenic compound Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000007799 cork Substances 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 150000001993 dienes Chemical class 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- UNPNRZOYJNMIDK-UHFFFAOYSA-M ethyl-dimethyl-(2-oxobut-3-enyl)azanium;chloride Chemical compound [Cl-].CC[N+](C)(C)CC(=O)C=C UNPNRZOYJNMIDK-UHFFFAOYSA-M 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- YVECGMZCTULTIS-PBXRRBTRSA-N glucal Chemical compound OC[C@H]1OC=C[C@@H](O)[C@@H]1O YVECGMZCTULTIS-PBXRRBTRSA-N 0.000 description 1
- 239000011121 hardwood Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229950007870 hexadimethrine bromide Drugs 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Inorganic materials Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 229920000831 ionic polymer Polymers 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000001471 micro-filtration Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000008450 motivation Effects 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 150000004965 peroxy acids Chemical class 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 229920000083 poly(allylamine) Polymers 0.000 description 1
- 229920000371 poly(diallyldimethylammonium chloride) polymer Polymers 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000007616 round robin method Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 235000012222 talc Nutrition 0.000 description 1
- OYMPAFSIZFMODW-UHFFFAOYSA-N tert-butyl-dimethyl-[3-(2-methylprop-2-enoylamino)propyl]azanium chloride Chemical compound [Cl-].C(C(=C)C)(=O)NCCC[N+](C(C)(C)C)(C)C OYMPAFSIZFMODW-UHFFFAOYSA-N 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/0014—Combination of various pulping processes with one or several recovery systems (cross-recovery)
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/0021—Introduction of various effluents, e.g. waste waters, into the pulping, recovery and regeneration cycle (closed-cycle)
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/0021—Introduction of various effluents, e.g. waste waters, into the pulping, recovery and regeneration cycle (closed-cycle)
- D21C11/0028—Effluents derived from the washing or bleaching plants
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C3/00—Pulping cellulose-containing materials
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
Landscapes
- Paper (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The present invention relates to a kind of method processing liquid flow in chemical pulp mills.This system includes the boiling process for producing paper pulp, at least one washing stage for washing pulp, at least one bleaching stage for bleached pulp, waste water disposal facility (40), original sub-block facility (30), and timber processing apparatus (50), the method includes at least some of low chloride content process water is transported to chemical pulp mills to be re-used as process water.Moreover, it relates to for the system processing chemical pulp mills liquid flow, and low chloride content process water is in the application of chemical pulp mills.
Description
Invention field
The present invention relates to a kind of method and system processing liquid flow in chemical pulp mills.
Background technology
In waste water disposal facility, generally process the effluent of chemical pulp mills, to reduce bad environmental
The amount of chemicals.There is many motivations and reduce the use of water and the volume of effluent, example
As supplied the cost of former water, possible limited water supply, save energy, and reduce fiber and chemicals
The possibility of loss.At present, pulp mill is typically established at region and the ring of the strictest environmental requirement
In border.Such as, the amount to the water that chemical pulp mills uses has strict restriction.Therefore, it is possible to due to
Water resource and pulp mill cannot be set up in the satisfactory place of other side.In many cases, need
Want cleaner environment, it is desirable to the material that pulp mill produces is less to the harm of environment.Therefore, at present
It is important that find a kind of scheme, to find the water round-robin method of more closure.
Summary of the invention
The present invention discloses a kind of method and system processing liquid flow in chemical pulp mills.According to the present invention,
Offer secondary water circulates, and it preferably includes low chloride content process water or by low chloride content work
Skill water forms.
At present, the whole effluent streams from chemical pulp mills are processed typically together.The present invention provides
A kind of scheme, reduces pulp mill's effluent by being separated by the net portion of process water and circulating
Total amount.Thus can re-use these process water streams and without entering in waste water disposal facility
Row processes, and therefore the program is cost-effective.
The target of the preferred embodiment for the present invention is that the secondary water producing independent low chloride content is followed
Ring, so contributes to the utilization of water, if having only to the purifying of lesser extent, then and can be with saving into
This purification process purifies this circulation.
Preferably, this system includes:
-for the digestion process of boiling paper pulp,
-at least one washing stage, to wash described paper pulp,
-at least one bleaching stage, to bleach described paper pulp,
-waste water disposal facility, and
-original sub-block facility.
In a preferred example, include according to the system of the present invention:
-at least one timber processing apparatus,
-slightly starch preparation facilities, it includes the boiling for producing paper pulp, washing, and screening and oxygen remove wood
The matter stage,
-bleaching system, it include bleaching stage with the paper pulp that produced of bleaching, this bleaching system is preferred
Including Na Shi (Nash) pump seal water and/or bleaching filter liquor,
-chemical recovery plant, its can include ejector condenser cooling water and/or vavuum pump seal water,
-recovery boiler, its also produce boiler discharge water, and
-evaporimeter, it produces condensate.
It addition, this system can include pulp dryer.But, this system can not also include described paper
Slurry drying machine.
Preferably, comprise the following steps according to the method for the present invention:
-at least some of low chloride content process water exports from pulp mill,
-this low chloride content process water is recycled to pulp mill, as process water.
Preferably, at least some of low chloride content process water is transported to homogenization groove and/or pond,
Then the process water of pulp mill it is re-used as.
The chloride content of low chloride content process water is preferably smaller than 200mg/l, more preferably less than
100mg/l.Additionally or alternatively, the Ca content of low chloride content process water is preferably smaller than 200
Mg/l, more preferably less than 100mg/l.Preferably, the pH of low chloride content process water is 6.5-10.
Preferably, low chloride content process water stream comprises the fiber process Wiring technology water from pipeline.
As an alternative or supplement, low chloride content process water stream preferably comprises from black liquor vaporizing and reclaims filtration
The sealing water in region.As an alternative or supplement, low chloride content process water stream preferably comprises from desalination
The sealing water of facility.As an alternative or supplement, low chloride content process water stream preferably comprises self-desiccation
The discarded object (rejects) of machine.As an alternative or supplement, low chloride content process water stream preferably comprise from
The groove overflow of drying machine.
Preferably, the washing during low chloride content process water stream at least partially serves as fire demand water pipeline
Sealing water in water and/or fire demand water pipeline.
In one preferred embodiment, low chloride content process water stream is first purified, and the most just weighs
The new process water being used as pulp mill.Preferably, by chemical method and/or mechanical means, subchloride is contained
Amount process water stream is purified.Preferably, low chloride content process water stream first passes through in techniques below
At least one be purified, be the most just re-used as process water:
-chemical flocculation technology,
-clarification technique,
-sand filtration technology and
The combination of-two or three above-mentioned technology.
Preferably, implement to purify in original sub-block facility.As an alternative or supplement, can be by including
Mechanically or chemically the purification devices of purification devices implements described purifying.
The present invention can implement in having the chemical pulp mills of procedure below or device: digestion process, extremely
A few bleaching stage, chemical recovery, and various reactor well known by persons skilled in the art, appearance
Device, pump, blender, filter etc..
Have benefited from the present invention, using the teaching of the invention it is possible to provide a kind of system with following ability:
-ambient influnence of chemical pulp mills can be reduced,
-the former water consumption of chemical pulp mills can be reduced, and
-amount of the effluent of generation in pulp mill can be reduced.
Feature in terms of some of the present invention is stated in independent claims 1,9 and 10.Appurtenance
Profit discloses the various embodiments of the present invention in requiring.
Accompanying drawing explanation
Hereinafter, it is more fully described the present invention in conjunction with accompanying drawing, wherein:
Fig. 1-2 shows some illustrative embodiments with the schematic diagram simplified.
Detailed Description Of The Invention
In this application, with reference to accompanying drawing 1-2, the following drawings is wherein used to mark:
10 low chloride content process waters,
20 effluents comprising bleaching effluent,
30 original sub-block facilities,
40 waste water disposal facilities,
41 gravity tables,
50 treating of wood devices,
60 fire-fightings and sealing water, and
70 include at least one machinery purification phase and/or the purifying at least one chemical purification stage
Device.This purification devices can include such as clarifier.
Term " low chloride content process water " refers to the process water with low chloride content.Preferably
Ground, the chloride content of low chloride content process water is less than 200mg/l, preferably smaller than 100mg/l.
It addition, low chloride content process water preferably has highly filled, it addition, they preferably contain
There is fiber.
Term " effluent " represents waste water.It is transported to effluent process for the waste water of purge process set
Execute.Effluent can include that such as bleaching effluent and ash leach purging thing (ash leaching purge). another
Outward, effluent can process effluent containing timber.
Term " bleaching effluent " refers to the effluent from the bleaching system described in literary composition and washing step.
Preferably, bleaching effluent contains bleaching filter liquor.It is highly preferred that bleaching effluent is leached by bleaching
Liquid forms.Bleaching filter liquor contains the acidity and/or basic stream produced in bleaching stage.Preferably,
Bleaching effluent not fibre-bearing.
Term " original sub-block facility " refers to fresh water treatment facility.
Term " effluent treatment facility " refers to waste water disposal facility.
Term " ECF " refers to without elemental chlorine.
Term " TCF " refers to be entirely free of chlorine.
Term " ESP " represents electrostatic precipitator.
Term " can recycle water " and refers to clean to being enough to and be re-used as the technique of process water in technical process
Use water.Can recycle water can be pure in original sub-block facility 30 and/or at least one purification devices 70
Change.
Term " EOP " refers to the association with pulp bleaching using oxygen and peroxide to carry out as extra chemical substance
During the alkaline extraction stage.
Term " NPE " refers to that Non-Process Elements (non-process elements) .NPE is from process equipment, has
Time also from timber, former water and the inorganic substances of chemical substance, they are not required for procedure.
Term " secondary water circulation " refers to comprise the low chloride content work not being transported to waste water disposal facility
The process water circulation of skill water.
Term " Adt " represents the air dry metric ton number of 90% dry chemical paper pulp.
Fire demand water refers to by for washing various object and in case of emergency for the water supply of fire extinguishing
The water of pipeline supply.
Sealing water is for the water sealed in vavuum pump.
Ejector condenser cooling water be directed to the water that directly contacts with the steam in ejector condenser or
Owing to directly contacting the water of generation with steam.
Gravity table is the device that permeability band makes sludge dewatering in being processed by waste water.Weight
Power sorting table shower water is used for washing described band.
The general purpose of the boiling operation in the production of the chemical pulp of bleaching is from being transported to digester
In fragment in recycled fiber, specifically utilize chemicals and heating remove viscose fibre lignin with
And the wood extractive bubbling and occurring precipitation in procedure after removing, will be caused.Therefore, in system
Often use during slurry and can dissolve many lignin and the chemicals of cellulose of trying one's best less as far as possible.Generally, system
The method of the chemical pulp making bleaching includes slurrying, washs, sieves, bleaches and cleaning stage.At present,
Sulfate boiling is the most frequently used method of manufcturing paper pulp, also referred to as brown paper boiling or slurrying, and it uses
NaOH (NaOH) and vulcanized sodium (Na2S) mixture.Method for cooking can disappear based on including one
Change device or the interval boiling of several digester or continuous cooking.
Thick slurry after boiling process processes and preferably includes washing process, and oxygen stage, and screening, with laggard
Row washing.Generally, washing facility last in the oxygen stage accepts the washing lotion that purity is the highest, to promote that paper pulp floats
In vain, the filtrate obtained from this last washing facility as washing lotion and dilutes use according to countercurrent washing principle.When
When the first thick plasm scouring equipment reclaims filtrate, filtrate can be delivered directly to forward black liquor vaporizing equipment,
Or may be used for changing for dilution and carrying during digester plant, then terminate with black liquor stream.Finally
After washing stage, paper pulp can be guided bleaching process.
Blanching step is used to improve the brightness of paper pulp, cleannes and brightness constancy.Remaining is wooden
Element is the principal element affecting color, therefore must be removed or make it to brighten.Generally, bleached paper
The purpose of slurry is to continue with delignification, and utilizes bleached chemical thing, to remove in boiling and oxygen stage
After remain in any wooden thing in paper pulp, i.e. residual lignin, these lignin will not decompose, molten
Solution is in boiling with in the oxygen stage, without sacrificing paper output or fibre property.And, bleached
Cheng Zhong, removes chromogenic compound, and is oxidized as leuco-compounds.Generally, the important portion of bleaching
Dividing is to be washed out from paper pulp by the lignin of dissolving on washer after bleaching stage.
For the purpose bleached,
-chlorine (Cl can be used2), ozone (O3) and/or peroxy acid (Paa and Caa) anti-with aromatics lignin unit
Should, and/or
-generally can use chlorine dioxide (ClO2) and/or oxygen (O2) with the lignin with free phenolic hydroxyl group
Structural response, and/or
-hypochlorite (H) and/or hydrogen peroxide (H can be used2O2) and some functional group reactionses.
But, chemical pulp industry needs to keep a kind of technology, wherein with chloride at least one stage
Paper pulp is bleached by chemicals so that chlorine dioxide is the primary chemical used in pulp mill's bleaching process
Thing.It would thus be advantageous to major general chlorine dioxide (ClO2) be used for bleaching purpose.
Bleaching effluent is typically an important source of biological and chemical oxygen consumption.Such as, from titanium dioxide
The chloride inorganic compound of the reaction of chlorine and/or chlorine and organochlorine compound may be retained in procedure.Drift
Various lignin compounds are separated from fiber by white process, and these compounds retain with the form of organic molecule
In effluent.It addition, sulfuric acid can be used in bleaching stage to carry out pH regulation, and it is used as glucal
The main chemical that aldehydic acid (hexenuronic acid) hydrolyzes.In alkali stage, it is also possible to use hydrogen-oxygen
Change sodium and carry out pH regulation and lignin extraction.In addition, according to bleaching sequence, can in bleaching
Use oxygen and/or peroxide.But, in elementary analysis, they should be the material meeting following condition:
I.e. the impact of such as purge process is negligible by they.
In one example, use hydrochloric acid to carry out pH regulation, and/or use sulfur dioxide and/or its
Its reducing agent removes the chemical residue from bleaching process, i.e. removes unreacted bleached chemical thing.
Pulp mill does not only have bleaching effluent, also process water, such as, cool down water, seals water, waste streams
(reject flows), channel water, the slurry of equipment, rainwater and timber processing water.Described technique is used
Water does not generally contact with pulping process, but timber processing water and some channel water deriving from technique overflow are removed
Outward, they contact with pulping process.Therefore, the effluent accumulated wherein is mainly leakage and overflow,
Equipment ruptures the interim effluent caused, the slurry of equipment, derives from the fabric accomplished continuously or intermittently washed
(silk screen and felt) or container, derive from the leakage of discarding system.
As it has been described above, thick slurry processes and includes at least one washing process.Advantageously, thick slurry processes bag
Include:
-screening process,
-oxygen goes the wooden stage, and
-at least one washing stage after oxygen goes the wooden stage.
After screening process can be located at digester purging, in the middle of the washing process or afterwards, or at oxygen
After going the wooden stage.Generally, it is bleaching process after these process stages, is preferably based on ECF skill
Art, it includes having one or more bleaching stage based on use chlorine dioxide and use other known
The association with pulp bleaching facility in the possible stage of bleached chemical thing.Advantageously, bleaching process includes at least one
Individual alkali stage, the most preferably at least uses oxygen and/or peroxide.Can also use for removing weight
The ozone stage of metal, acid phase and chelate stage.
At least include the alkaline boiling process for producing paper pulp according to the method for the present invention, preferably make
The bleaching plants (wherein forming chloride effluent) bleached with ECF, and be used for processing bleaching
Facility effluent and/or effluent purifying facility (the waste water process of other effluent in pulp mill's generation
Facility).Or, TCF bleaching can be used to replace ECF bleaching.
Advantageously using ECF bleaching, wherein said bleaching includes acidic phase and alkali stage simultaneously.
ECF bleaching includes all such bleaching process, i.e. includes at least one chlorine dioxide stage and in office
What bleaching stage does not the most use element state chlorine.It is currently used for the modern ECF bleaching process of bleached pulp
Generally being made up of at least two, more advantageously at least three bleaching stage, described bleaching stage is preferred
Including at least three washing facility.If using chlorine dioxide in a bleaching stage, the most the most frequently used
Dosage be 5-15kg act.Cl/adt paper pulp.Chlorine dioxide dosages for cork is usually 25-35
Kg/adt, the chlorine dioxide dosages for hardwood is usually 20-30kg/adt.If pulp mill also to enter one
Step reduces the amount of organochlorine compound, then the policy of pulp mill is typically in pulp mill at it
Reason rather than the use of minimizing chlorine dioxide.
Pulp mill generally includes chemical recovery facility, and it includes being generally of the evaporation equipment being connected in series
Evaporation process, chemical recovery boilers, from technical process, remove chloride, and boil for production
The chemical production facilities of chemicals processed.
It is applicable at least a part of which for preparing the circulatory system of at least partly Guan Bi of the chemical pulp of bleaching
The method that the water of part and other chemicals recycle and re-use, thus farthest reduce useless
Thing processes.Described system is particularly well-suited to farthest reduce aqueous effluent, therefore protects environment
Avoid being disposed by effluent being affected, without substantially jeopardizing the value of process costs or salable item.
Chlorine, potassium, calcium, manganese, silicon, aluminium, phosphorus, iron and barium are some related in the chemical pulp mills bleached
Element.
Preferably, at least one effluent to waste water disposal facility processes line and provides biological treatment.When
When the ratio of harmful organic substance declines, biological treatment is particularly effective, and described harmful organic substance is main
Comprise the lignin compound separated in bleaching, hemicellulose and the component deriving from extraction, they structures
Become the major part of the effluent of bleaching plants.Many is had to derive from the compound of timber, these chemical combination
A part in thing is chlorination, and a part is the hydrocarbon of low-molecular-weight.Because microorganism
Only using the organic moiety of effluent as nutrient, all inorganic substances, at least inorganic elements are retained in stream
Go out in thing.Therefore, through the water of biological treatment, such as by sedimentation separation solid constituent and liquid
After component, in terms of the organic component contained for, hence it is evident that than the effluent that otherwise processes more
Totally, but owing to it contains inorganic substances, it is often necessary to it is discharged from technical process.
Fig. 1 shows an example of pulp mill.Generally, in pulp mill, fragment and white liquor are supplied to
Digester for paper pulp boiling.After boiling, defeated through the paper pulp (so-called thick slurry) of boiling
The processing stage of delivering to washing and oxygen.Generally, hot water is used for the described washing stage.To operate from boiling
Light/dark balance liquid from boiling operation be transported to evaporation stage, in this stage by some water from light/dark balance liquid
Body removes, therefore produces aterrimus liquid.From the water of light/dark balance liquids recovery, i.e. come self-evaporating
Condensate, is preferably delivered in washing stage or thick slurry.To the aterrimus liquid produced at evaporation stage
Body processes, to obtain green liquor.Process green liquor further, to obtain being reused for the white of boiling
Liquid.From washing and the oxygen of thick slurry processing stage out after, paper pulp is transported to bleaching system.Bleaching dress
Put and generally include the several bleaching stages for bleached pulp.Bleaching system generally same at bleached pulp
Time produce acid and alkalescence effluent, these effluents are usually fed to waste water disposal facility.Pass through
The paper pulp of bleaching is usually fed to paper mill or pulp dryer.
One example of the Fig. 2 schematic diagram display secondary water circulation to simplify.Such as, this example can depend on
Implement according in the pulp mill of Fig. 1.Fig. 2 shows low chloride content process water stream 10, comprises bleaching stream
Go out the effluent 20 of thing, original sub-block facility 30, waste water disposal facility 40, gravity table 41, wood
Material processing means 50, fire-fighting and sealing current 60, and optional purification devices 70.
Before at least one purification devices 70 may be located at original sub-block facility 30, and/or it is positioned at former
After water processing establishment 30.
Described original sub-block facility 30 preferably at least includes that the input of former water and waterfall shape rush down, former clarification of water
Device, sand filter and/or more medium filter.Preferably, original sub-block facility 30 include at least two,
The process line that more preferably at least three, most preferably at least four are independent.If low chloride content technique
Process in original sub-block facility 30 with current 10, then can be transported to original sub-block and set
Execute in any described purification phase of 30.
Low chloride content process water stream 10 can be at the place being different from the former water coming from water system
Reason line is cleaned.In this case, low chloride content process water stream 10 is only with former aqueous phase
The process line of vertical original sub-block facility 30 purifies.Or, low chloride content process water stream 10
Can with process in line at least one of original sub-block facility 30 together with the former water of water system 10
Purify.It is, however, preferable that original sub-block facility 30 is used for purify low chloride content process water
The process line of stream 10 is separate with former water source, i.e. this at least one process line is preferably only used for purifying low
Chloride content process water stream 10.
According to the present invention, a part of process water preferably being separated after purification and again at lesser extent
Utilize.Owing to this secondary water circulates, inside process water, there is circulation.In other words, it is not institute
Some process waters are all transported to waste water disposal facility 40, but a part of process water is in this process
Re-use.Have benefited from the circulation of this secondary water, it is possible to reduce the former water consumption of pulp mill.
Preferably, ash is processed waste streams and merges with acidity and the basic stream from bleaching, form stream
Effluent stream 20.If EOP filter liquor processes 50 for timber, then from the liquid of timber processing apparatus 50
Stream is preferably delivered into the effluent stream 20 comprising bleaching effluent.Otherwise, from timber processing apparatus
The liquid flow of 50 is preferably delivered into low chloride content process water stream 10.Comprise the stream of bleaching effluent
Effluent stream 20 is preferably delivered into waste water disposal facility 40.
Preferably fire-fighting and sealing water are guided low chloride content process water stream 10.As supplement or
Substituting, the current comprising the water from pipeline from fiber process line are preferably directed to subchloride and contain
Amount process water stream 10.
Preferably, this system includes purification devices 70, and it includes for purifying low chloride content technique
With at least one machinery purification phase and/or at least one chemical purification stage of current 10.Preferably,
Purification devices 70 is the clarifier for removing suspended solid.
If using purification devices 70, then the water purified in mechanically or chemically purification devices 70 is the most extremely
Partially it is directed to original sub-block facility 30.As an alternative or supplement, dress is mechanically or chemically being purified
Put the water purified in 70 to be preferably directed to pulp mill and be re-used as process water.But, this process water
Must recycle, if i.e. not using original sub-block to set after the process of described purification unit
Execute or other purification devices any, the most cleaned to being enough to act as process water after purification devices 70.
Preferably, at least some of low chloride content process water 10 is at purification devices 70 and/or former water
In treatment facility 30 purify, to obtain recycling water, described recycle water after can be reused for
Technical process.
Preferably, secondary water circulation is the independent current from the purest part, i.e. low chloride content
Process water.Low chloride content process water preferably includes the fiber process Wiring technology water from pipeline,
Preferably including Nash pump and seal water, the total amount of fiber process Wiring technology water is such as 0-5m3/ Adt, more excellent
Elect 1-3m as3/Adt.As an alternative or supplement, low chloride content process water preferably includes from recovery
The sealing water in boiler and/or desalter region and discharge water, total amount is such as 0-1m3/ Adt, more preferably
It is 0.1 0.5m3/Adt.As an alternative or supplement, low chloride content process water preferably includes from black
The sealing water of liquid evaporation installation, total amount is such as 0-1m3/ Adt, more preferably 0.1 0.5m3/Adt。
As an alternative or supplement, low chloride content process water preferably includes from the groove overflow of drying machine and/or useless
Gurry, total amount is such as at most 3m3/ Adt, is more preferably up to 0.1m3/Adt.As an alternative or supplement,
Low chloride content process water preferably includes causticization ejector condenser cooling water, and total amount is the most most 4
m3/ Adt, more preferably 1 2m3/Adt.As an alternative or supplement, low chloride content process water is excellent
Choosing includes wood working process water, and total amount is such as at most 2m3/ Adt, more preferably 12
m3/Adt。
Preferably, low chloride content process water comprise two or three, more preferably four kinds or five kinds,
Preferably five kinds or six kinds of above-mentioned water sources.
Most preferably, low chloride content process water comprises fiber process Wiring technology water/or seals water.
Preferably, in all above-mentioned low chloride content process waters at least 50% or at least 60%,
More preferably at least 70% or at least 80%, most preferably at least 90% or at least 95% without at waste water
Purification process in reason facility just can be re-used as process water.
Preferably for low chloride content process water 10, there is at least one storage device, example
Such as homogenization groove and/or pond.Fire-fighting and sealing water 60 are not usually required to groove, and these water can such as pass through
Pipeline conveying and without any storage device.
Low chloride content process water is preferably optional in purification devices 70 and/or original sub-block facility 30
Purification step before there is low NPE content.
Preferably, low chloride content process water stream had had following spy before any purification step
Levy:
-Cl content is less than 100mg/l less than 200mg/l, more preferably Cl,
-Ca content is less than 100mg/l less than 200mg/l, more preferably Ca,
-sulphates content is less than 1,500mg/l, more preferably less than 1,000mg/l,
The pH value of-water is 6.5-10, and
-COD value is less than 1200mg/l or is less than 1100mg/l, more preferably less than 1000mg/l or is less than
800mg/l, most preferably less than 500mg/l.
Such as, in order to reduce sulphates content and/or the COD value of low chloride content process water stream, need
Step to be purified, this is because low chloride content process water stream is excellent when being re-used as process water
Choosing has the feature that
-Cl content is less than 200mg/l,
-Ca content is less than 110mg/l,
-sulphates content is less than 200mg/l,
-COD value is less than 100mg/l,
The pH of-water is 6.5-10, and
-potassium permanganate usage amount is less than 25mg/l.
Low chloride content process water 10 and comprise Cl, Ca and COD of effluent 20 of bleaching effluent
It is worth significantly different, it addition, the waste water of the purifying of low chloride content process water 10 and waste water disposal facility
Cl, Ca and COD value the most significantly different.Particularly, the chlorination of low chloride content process water 10
Thing content differs markedly from the chloride content of effluent 20, is also significantly different from waste water disposal facility pure
The chloride content of the waste water changed.Such as, for bleaching effluent, it is 15m at wastewater flow rate3The paper of/Adt
The NPE content of slurry factory can be such that
-Cl content is about 350mg/l, and
-Ca content is about 110mg/l,
And for the waste water purified in waste water disposal facility, the NPE content under same case is as follows:
-Cl content is about 440mg/l, and
-Ca content is about 150mg/l.
The COD value of bleaching effluent ordinarily be about 2500-3000mg/l, it is therefore desirable to reduces this value, logical
Method usually through biologically pure is carried out.And, the pH of bleaching effluent differs markedly from subchloride and contains
Amount process water 10, the pH of bleaching effluent ordinarily be about 4.But, according to basicity or the acid of effluent
Degree, pH value natural trend.Typically, since the amount of acid bleaching filter liquor is the biggest, so merge
Effluent stream is acid.
Low chloride content process water 10 is at least divided into two streams according to their COD content.
In the part of relatively low COD, COD content is preferably at most 600mg/l, such as 40-600mg/l.
In one example, there is low chloride content process water 10 quilt of higher COD than other parts
Being transported in extra purification process, such as, from the process water for the treatment of of wood, wherein COD can
For 1300mg/l, and/or the process water from pulp dryer device, wherein COD can be 800
mg/l。
Preferably, in order to realize low chloride content in low chloride content process water 10, with bottom
Point not included in low chloride content process water, and it is directed to effluent 20 and/or waste water processes and sets
Execute 40:
-ESP ash leaches purging thing (ash leaching purge) and/or other ash processes discarded object, generally wraps
Containing high chloride content, and
-wood working process water, premise is that EOP bleaching filter liquor is processed for timber.
The circulation of low chloride content process water stream 10 preferably at least part re-uses in for washing mesh
Target fire demand water pipeline (such as, is measured as 2m3/ Adt) and/or for the fire demand water pipeline of target seal.
As an alternative or supplement, low chloride content process water stream preferred cycle re-uses and processes in waste water
The gravity table spray thrower of facility, such as, measures as 0.7m3/Adt。
As an alternative or supplement, low chloride content process water stream preferred cycle re-uses and adds in timber
Work, such as, measures as 1.2m3/Adt.The alkaline pH of this logistics is preferred for timber processing apparatus, otherwise
From timber the component of dissolution be likely to result in there environment acidity too high.
As an alternative or supplement, what low chloride content process water stream was preferred in ejector condenser is cold
But water carries out causticization.
In one example, water can be recycled in order to obtain, process to circulate with cost-effective purification process
Low chloride content process water.Preferably, the purifying of low chloride content process water includes chemistry wadding
Solidifying stage, clarification stage, sand filtration stage and/or sterilisation stage such as UV, H2O2Or O3Process.
As an alternative or supplement, at least one purification phase of low chloride content process water includes with being referred to as
Johnson's method for sieving (Johnson Screens method) utilize the flocculated stage that magnetic iron ore carries out.As
Substituting or supplement, at least one purification phase of low chloride content process water includes micro-filtration stage.As an alternative or
Supplementing, at least one purification phase of low chloride content process water includes oxidation stage.As an alternative or supplement,
At least one purification phase of low chloride content process water includes ultra-filtration stage.As an alternative or supplement, low chlorination
At least one purification phase of thing content process water includes nano-filtration stage.As an alternative or supplement, subchloride
At least one purification phase of content process water includes another chemical and/or mechanical purification phase.Preferably, low
The purifying of chloride content process water includes the one, two or three above-mentioned stage.
Flocculant for the chemical flocculation stage can include that the long-chain of such as with or without electric charge is organic
Polymer (cation, anion or non-ionic polymers or their salt).It is preferred that flocculant
Comprise at least one in following compound, such as a kind of, two kinds, three kinds, four kinds, five kinds or six
Kind:
-polyamine,
-poly-(allyl amine),
-poly-(diallyldimethylammonium chloride),
-poly-(amidoamines),
-poly-(vinyl formamide),
-PVP,
-poly-(vinyl acetamide),
-poly-(vinyl methyl formamide),
-poly-(vinyl methylacetamide),
-poly-(dimethylaminopropyl Methacrylamide),
-poly-(dimethyl amino ethyl acrylate),
-poly-(diethylamino ethyl propylene acid esters),
-poly-(acryloyl ethyl trimethyl ammonium chloride),
-poly-(acrylamidopropyl trimethyl ammonium chloride),
-poly-(methacrylamidopropyltrimethyl trimethyl ammonium chloride),
-poly-(acrylamide), poly-(ethene-imines),
-poly-(oxirane),
-poly-(vinylpyridine),
-Hexadimethrine Bromide (hexadimethrinbromide),
-poly-(dimethyl amine-co-chloropropylene oxide),
-poly-(dimethylamine-co-epichlorohydrin-co-ethylenediamine),
-poly-(amidoamines-chloropropylene oxide) or copolymer,
-N-vinyl formamide,
-allyl amine,
-diallyldimethylammonium chloride,
-N-vinyl acetamide,
-NVP,
-N-methyl-N-vinylformamide,
-N-methyl-Nvinylacetamide,
-dimethylaminopropyl Methacrylamide,
-dimethyl amino ethyl acrylate,
-diethylamino ethyl propylene acid esters,
-homopolymerization form and/or with branched structure acryloyl ethyl trimethyl ammonium chloride or
Methacrylamidopropyltrimethyl trimethyl ammonium chloride,
With
-other flocculant, wherein the degree of functionality of polymer is based on quaternary ammonium group, such as at base
In the derivative of starch.
In preferred example, acrylamide and/or polyacrylamide and so-called DADMAC (diene
Diallyidimethylammonium chloride) it is used together.As an alternative or supplement, acrylamide preferably with another kind
Acrylamide one reacts, and forms polyacrylamide.
It is preferred that flocculant comprises polyamine.As an alternative or supplement, flocculant comprises poly-(diallyl
Alkyl dimethyl ammonium chloride) (the most poly-DADMAC).As an alternative or supplement, flocculant comprises poly-(acylamino-
Amine) (i.e. PAA).As an alternative or supplement, flocculant comprises poly-(vinyl formamide) (i.e. PVAm).
As an alternative or supplement, flocculant comprises poly-(aziridine) (i.e. PEI).As an alternative or supplement, wadding
The solidifying agent form by homopolymerization form and/or with branched structure forms, and wherein the degree of functionality of polymer is base
In quaternary ammonium group, such as in derivative based on starch.In one preferred embodiment, two
Kind or three kinds, more preferably four kinds, most preferably five kinds above-mentioned flocculants be used together.
As the replacement or supplementary of flocculant, other compound such as coagulating agent and/or adsorbent can be used for pure
The change stage.
Coagulating agent can include aluminium compound.Preferably, aluminium compound includes aluminum nitrate.As an alternative or
Supplementing, aluminium compound includes aluminium chloride.As an alternative or supplement, aluminium compound include alum and they
Polymerized form, the most poly-aluminum nitrate (PAN), polyaluminium chloride (PAC) and/or poly aluminium sulfate (PAS).
As an alternative or supplement, coagulating agent includes ferrous compound, such as FeCl2And/or FeSO4.Make
For substituting or supplementing, coagulating agent includes ferric iron compound, such as FeCl3And/or Fe2(SO4)3。
Adsorbent can include such as clay, bentonite and/or talcum.
Preferably, ash is processed waste streams (preferably comprise ash and leach purging thing) and is transported to effluent stream 20.Excellent
Selection of land, acidity and basic stream from bleaching are also transported to effluent stream 20.This effluent stream 2 is preferred
It is directed to waste water disposal facility 40.In one example, due to the effluent of waste water disposal facility to be transported to
Quantity and quality, such as due to relatively low volume concentration load, particularly there is the low molecule of high COD
Amount component, is changed aerobic treatment existing in waste water disposal facility.Preferably, according to the present invention's
Waste water disposal facility includes:
-anaerobic reactor+aerobic treatment, or
-anaerobic reactor+membrane bioreactor.
It should be readily apparent to one skilled in the art that the different embodiments of the present invention can apply to need right
In the environment that the liquid flow of pulp mill is optimized.It is, therefore, apparent that the present invention is not limited in above-mentioned enforcement
Mode, but can modify within the scope of the appended claims.
Claims (12)
1. the method processing liquid flow in chemical pulp mills, this system includes:
-for producing the boiling process of paper pulp,
-at least one is for washing the washing stage of described paper pulp,
-at least one is for bleaching the bleaching stage of described paper pulp,
-waste water disposal facility (40),
-original sub-block facility (30), and
-timber processing apparatus (50),
Wherein, described method includes:
-low chloride content process water is divided at least two strands according to their COD content
Logistics, the chloride content of described low chloride content process water is less than 200mg/l,
-at least some of low chloride content process water is transported to chemical pulp mills, again to use
Make process water.
2. the method for claim 1, it is characterised in that described method includes: will have higher
The low chloride content process water of COD content is transported to extra purification process.
3. method as claimed in claim 2, it is characterised in that there is the low of higher COD content
In chloride content process water, COD content is more than 600mg/l.
4. method as claimed in claim 1 or 2, it is characterised in that described low chloride content technique
With water comprise set forth below at least one:
-from the fiber process Wiring technology water of pipeline,
-from the sealing water in recovery boiler region,
-from the discharge water in recovery boiler region,
-from the sealing water of desalinization facility,
-from the sealing water of evaporation installation,
-from the discarded object of drying machine,
-from the groove overflow of drying machine,
-causticization ejector condenser cooling water, or
-wood working process water.
5. method as claimed in claim 1 or 2, it is characterised in that low chloride content technique
With the chloride content of water less than 100mg/l.
6. method as claimed in claim 1 or 2, it is characterised in that low chloride content technique
With the Ca content of water less than 200mg/l.
7. method as claimed in claim 6, it is characterised in that low chloride content process water
Ca content less than 100mg/l.
8. method as claimed in claim 1 or 2, it is characterised in that low chloride content process water
PH be 6.5-10.
9. method as claimed in claim 1 or 2, it is characterised in that at least one of subchloride
Content process water is transported in the following facility of pulp mill use:
-fire demand water pipeline, is used for washing target,
-fire demand water pipeline, for target seal,
-waste water disposal facility, for gravity table spray thrower,
-timber processing apparatus, or
-ejector condenser, cools down water as causticization.
10. method as claimed in claim 1 or 2, it is characterised in that described method includes:
-be transported to process in waste water disposal facility (40) by the ash process waste streams of chemical pulp mills
Effluent stream (20).
11. methods as claimed in claim 1 or 2, it is characterised in that described low chloride content
Process water stream utilizes at least one in techniques below to be purified at least one purification phase,
Then process water it is re-used as:
-chemical flocculation technology,
-clarification technique,
-filtering technique,
-disinfection technology,
-micro-filter technology,
-oxidation technology,
-hyperfiltration technique, or
-nanofiltration technique.
12. chloride contents low chloride content process water less than 200mg/l is in chemical pulp mills
At least one following facility in application:
-fire demand water pipeline, for washing and/or sealing purpose,
The gravity table of-waste water disposal facility, for shower water,
-timber processing apparatus, is used for washing purpose, or
-ejector condenser, cools down water for causticization；
Described chemical pulp mills includes:
-for the digestion facility of boiling paper pulp,
-for the washing facility of washing pulp,
-bleaching equipment,
-waste water disposal facility (40),
-original sub-block facility (30), and
-timber processing apparatus (50).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20125264A FI128900B (en) | 2012-03-12 | 2012-03-12 | A method for treating liquid flows at a chemical pulp mill and use of low chloride content process waters at a chemical pulp mill |
| FI20125264 | 2012-03-12 | ||
| PCT/FI2013/050269 WO2013135956A2 (en) | 2012-03-12 | 2013-03-12 | A method and a system for treating liquid flows at a chemical pulp mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104169493A CN104169493A (en) | 2014-11-26 |
| CN104169493B true CN104169493B (en) | 2016-09-07 |
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| CN201380014049.6A Active CN104169493B (en) | 2012-03-12 | 2013-03-12 | A kind of method and system processing liquid flow in chemical pulp mills |
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|---|---|
| CN (1) | CN104169493B (en) |
| BR (1) | BR112014022420B1 (en) |
| FI (1) | FI128900B (en) |
| RU (1) | RU2634894C2 (en) |
| UY (1) | UY34673A (en) |
| WO (1) | WO2013135956A2 (en) |
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| CN104878636B (en) * | 2015-04-23 | 2017-08-25 | 中国制浆造纸研究院 | A kind of purified cotton preparation and its method for pollutant control |
| FI128252B (en) * | 2015-11-04 | 2020-01-31 | Kemira Oyj | Method for optimising material recovery in a chemical pulping process |
| SE542676C2 (en) * | 2017-11-29 | 2020-06-23 | Axolot Solutions Ab | Method and a system for washing paper pulp |
| SE2230351A1 (en) * | 2022-11-02 | 2024-05-03 | Valmet Oy | Pulp mill |
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| US5938892A (en) * | 1991-01-28 | 1999-08-17 | Champion International Corporation | Process for recycling bleach plant filtrate |
| CN101688362A (en) * | 2007-06-15 | 2010-03-31 | 安德里兹公司 | Method for treating liquid flows at a chemical pulp mill |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1113207A (en) * | 1978-04-19 | 1981-12-01 | Allan F. Gilbert | Removal of potassium values from pulp mill liquors |
| US5853535A (en) * | 1991-01-28 | 1998-12-29 | Champion International Corporation | Process for manufacturing bleached pulp including recycling |
| US5549788A (en) * | 1992-07-30 | 1996-08-27 | A. Ahlstrom Corporation | Minimal effluents discharge pulp mill with chemical recovery |
| JPH09502229A (en) * | 1993-09-02 | 1997-03-04 | ユニオン キャンプ パテント ホールディング インコーポレイテッド | Improved bleaching method for lignocellulosic pulp |
| US5626717A (en) * | 1995-06-01 | 1997-05-06 | International Paper Company | Oxidative treatment of bleach plant effluent |
| US6569284B1 (en) * | 1996-09-24 | 2003-05-27 | International Paper Company | Elemental-chlorine-free bleaching process having an initial Eo or Eop stage |
| EP0863113A1 (en) * | 1997-03-07 | 1998-09-09 | Akzo Nobel N.V. | Process for treating wastewater |
| RU2211836C1 (en) * | 2002-04-24 | 2003-09-10 | Кочетов Анатолий Сергеевич | Method of processing larch wood to isolate dehydroquercitine and apparatus |
-
2012
- 2012-03-12 FI FI20125264A patent/FI128900B/en active IP Right Grant
-
2013
- 2013-03-12 RU RU2014136219A patent/RU2634894C2/en active
- 2013-03-12 UY UY0001034673A patent/UY34673A/en active IP Right Grant
- 2013-03-12 BR BR112014022420-0A patent/BR112014022420B1/en active IP Right Grant
- 2013-03-12 WO PCT/FI2013/050269 patent/WO2013135956A2/en active Application Filing
- 2013-03-12 CN CN201380014049.6A patent/CN104169493B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5938892A (en) * | 1991-01-28 | 1999-08-17 | Champion International Corporation | Process for recycling bleach plant filtrate |
| CN101688362A (en) * | 2007-06-15 | 2010-03-31 | 安德里兹公司 | Method for treating liquid flows at a chemical pulp mill |
Also Published As
| Publication number | Publication date |
|---|---|
| RU2634894C2 (en) | 2017-11-07 |
| WO2013135956A2 (en) | 2013-09-19 |
| RU2014136219A (en) | 2016-05-10 |
| BR112014022420A2 (en) | 2017-06-20 |
| FI20125264L (en) | 2013-09-13 |
| WO2013135956A3 (en) | 2013-11-21 |
| BR112014022420B1 (en) | 2021-06-29 |
| CN104169493A (en) | 2014-11-26 |
| UY34673A (en) | 2013-10-31 |
| FI128900B (en) | 2021-02-26 |
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