CN104169492A - Method and system for treating liquid flows at chemical pulp mill - Google Patents
Method and system for treating liquid flows at chemical pulp mill Download PDFInfo
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- CN104169492A CN104169492A CN201380013968.1A CN201380013968A CN104169492A CN 104169492 A CN104169492 A CN 104169492A CN 201380013968 A CN201380013968 A CN 201380013968A CN 104169492 A CN104169492 A CN 104169492A
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- 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
- 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
- D21C11/0064—Aspects concerning the production and the treatment of green and white liquors, e.g. causticizing green liquor
-
- 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
- D21C11/12—Combustion of pulp liquors
-
- 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
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Abstract
The invention relates to a method for treating liquid flows at a chemical pulp mill. The method comprises conveying at least one predetermined water flow to at least one predetermined place at a system. In addition, the invention relates to the system for treating liquid flows.
Description
Invention field
The present invention relates to a kind of method and system at chemical pulp mills treatment fluid stream.
Background technology
Conventionally in waste water disposal facility, process the effluent of chemical pulp mills, to reduce the amount of environmentally harmful compound.Exist many motivations to reduce the use of water and the volume of effluent, for example, supply the cost of former water, water supply that may be limited, saves energy, and the possibility that reduces fiber and chemical wear.At present, pulp mill is based upon in the region and environment of very strict environmental requirement conventionally.The amount of the water for example, chemical pulp mills being used has strict restriction.Therefore, likely due to water resource, cannot set up pulp mill in the satisfactory place of other side.In many cases, need more clean environment, the material that requires pulp mill to produce is less to the harm of environment.Therefore, importantly find at present a kind of scheme, with the water circulation method of finding more to seal.
Summary of the invention
The present invention discloses a kind of method and system at chemical pulp mills treatment fluid stream.The feature of aspects more of the present invention is stated in independent claims 1 and 12.Various embodiment of the present invention has been described in dependent claims.
According to system of the present invention, comprise:
-at least one wood treatment device,
-slightly starch preparation facilities, it comprises the boiling for the production of paper pulp, washing, screening and oxygen go the wooden stage,
-bleaching system, it comprises the paper pulp that bleaching stage is produced with bleaching, this bleaching system comprises Na Shi (Nash) pump seal water and/or bleaching filtrate,
-chemical recovery device, it can comprise ejector condenser cooling water and/or vavuum pump sealing water,
-recovery boiler, it also produces boiler and discharges water, and
-evaporimeter, it produces condensate.
This system can comprise pulp dryer.But this system also can not comprise described pulp dryer.
Preferably, at least a portion process water is transported to the process water that is again used as pulp mill.
Preferably, for the method at chemical pulp mills treatment fluid stream comprise by the EOP bleaching filter liquor from bleaching system be transported to again as pulp mill at least one processing stage process water.This application can be the wood treatment of wood treatment device, and the oxygen of slightly starching preparation facilities removes wooden washing or dilution water, or the gravity table shower water in waste water disposal facility.As an alternative or supplement, for the method at chemical pulp mills treatment fluid stream, comprise the process water Na Shi from bleaching system (Nash) pump seal water is transported to again as at least one pulp mill processing stage.This application can be that the oxygen of slightly starching in preparation facilities removes wooden washing or dilution water, drum-type displacement washing device dish in bleaching system, the washing step of bleaching system or dilution water, the drying machine shower water in pulp dryer, or the gravity table shower water in waste water disposal facility.As an alternative or supplement, the process water processing stage of comprising that for the method at chemical pulp mills treatment fluid stream the condensate of flash-pot is transported to again as at least one pulp mill in the future.This application can be the gravity table shower water in waste water disposal facility.As an alternative or supplement, for the method at chemical pulp mills treatment fluid stream, comprise the process water water from waste water disposal facility the second clarifier is transported to again as at least one pulp mill processing stage.This application can be the wood treatment of wood treatment device, and the oxygen of slightly starching preparation facilities removes wooden washing or dilution water, or the gravity table shower water in waste water disposal facility.As an alternative or supplement, for the method at chemical pulp mills treatment fluid stream, comprise the process water ejector condenser cooling water from chemical recovery device is transported to again as at least one pulp mill processing stage.This application can be the gravity table shower water in waste water disposal facility or pulp mill's water system.As an alternative or supplement, for the method at chemical pulp mills treatment fluid stream, comprise the process water vavuum pump sealing water from chemical recovery device is transported to again as at least one pulp mill processing stage.This application can be the gravity table shower water in waste water disposal facility or pulp mill's water system.As an alternative or supplement, for the method at chemical pulp mills treatment fluid stream, comprise the boiler from recovery boiler is discharged to the process water of water be transported to again as at least one pulp mill processing stage.This application can be thin liquid groove or the white liquid condensing groove in chemical recovery device.
Preferably a kind of, two or three above-mentioned water, more preferably four kinds or five kinds of above-mentioned water, most preferably six kinds or seven kinds of above-mentioned water are for the present invention.But " from the water of waste water disposal facility the second clarifier " is preferably excluded outside above-mentioned, because it is preferred embodiment unlike other water.
Preferably, the round log washing for wood treatment device by least one above-mentioned water guiding.As an alternative or supplement, the chopping operation for wood treatment device by least one above-mentioned water guiding.As an alternative or supplement, the fragment screening for wood treatment device by least one above-mentioned water guiding.As an alternative or supplement, at least one above-mentioned water guiding is carried for the fragment of wood treatment device.As an alternative or supplement, at least one above-mentioned water guiding is gone to wooden washing for the thick oxygen of starching preparation facilities.As an alternative or supplement, the dilution water for thick slurry preparation facilities by least one above-mentioned water guiding.As an alternative or supplement, drum-type displacement washing device (Drum Displacement washer, the i.e. DD washer) dish for bleaching system by least one above-mentioned water guiding.As an alternative or supplement, the washing step for bleaching system by least one above-mentioned water guiding.As an alternative or supplement, the dilution water for bleaching system by least one above-mentioned water guiding.As an alternative or supplement, the drying machine shower water for pulp dryer by least one above-mentioned water guiding.As an alternative or supplement, the gravity table shower water for waste water disposal facility by least one above-mentioned water guiding.As an alternative or supplement, the thin liquid groove for chemical recovery device by least one above-mentioned water guiding.As an alternative or supplement, the white liquid condensing groove for chemical recovery device by least one above-mentioned water guiding.
But " oxygen of slightly starching preparation facilities goes wooden washing " and " slightly starching the dilution water in preparation facilities " preferably foreclose, because they are preferred not than other.
As a supplement or substitute, described method preferably includes at least a portion is transported to in next, two or three stages from the process water of Nash pump sealing water:
-at least one slightly starches preparatory phase,
-at least one bleaching stage, and
The drying machine shower water of-pulp dryer.
As a supplement or substitute, described method preferably includes the process water that at least a portion is discharged to water from causticization ejector condenser cooling water and/or boiler and is transported in following one or two stage:
-waste water disposal facility, for gravity table shower water, and/or
-chemical recovery.
As a supplement or substitute, the method preferably includes and at least a portion boiler is discharged to water is transported in the white liquid condensing groove of chemical recovery.Can improve like this liquid stock and at O
2the use of more times grade of condensate in washing after processing.As an alternative or supplement, described method preferably includes the washing step that at least a portion ejector condenser cooling water and/or dregs filter vavuum pump water is transported to Treatment of Sludge region.
Be preferred for comprising in the system of chemical pulp mills treatment fluid stream:
-wood treatment device,
-slightly starch preparation facilities, it comprises the boiling (comprising digester) for the production of paper pulp, washing, screening and oxygen go the wooden stage,
-bleaching system,
-chemical recovery device, and
-evaporimeter.
In addition, this system preferably includes at least a portion being come the process water of flash-pot be transported to wood treatment device and/or slightly being starched preparation facilities and/or the conveying equipment of bleaching system and/or pulp dryer and/or chemical recovery device.
In addition, this system preferably includes at least a portion is transported to the conveying equipment of at least one bleaching stage of bleaching system from the process water of the drying machine of paper pulp.
In addition, this system preferably includes at least a portion is transported to at least one chemical recovery stage of chemical recovery device and/or the conveying equipment of pulp dryer from the process water of recovery boiler.
In addition, this system preferably includes at least a portion is transported to wood treatment device and/or slightly starches preparation facilities and/or the gravity table shower water of bleaching system and/or waste water disposal facility and/or the conveying equipment in the chemical recovery stage of chemical recovery device from causticization ejector condenser cooling water and/or boiler discharge water.
In addition, this system preferably includes at least a portion is transported to the conveying equipment of thick slurry preparation facilities and/or bleaching system and/or chemical recovery device from the process water as Nash pump sealing water of bleaching system.
Described conveying equipment preferably at least comprises one or more pipelines and pump.
Therefore,, according to the present invention, the process water that the required former water of at least a portion of pulp mill is recycled substitutes.In other words, the process water of a part different processing stage between and/or processing stage in circulate, most preferably in waste water disposal facility, do not carry out any processing.Therefore, have benefited from the present invention, can obviously reduce the amount of produced waste water.
Therefore, have benefited from the present invention, a kind of system with following ability can be provided:
-can reduce the ambient influnence of chemical pulp mills, and
-can reduce the former water consumption of chemical pulp mills.
And, can also save energy and chemical reagent, obviously reduce thus operating cost.
The present invention can implement in the chemical pulp mills with following process or device: digestion process, at least one bleaching stage, chemical recovery, and various reactor well known by persons skilled in the art, container, pump, blender, filter etc.
Accompanying drawing explanation
Hereinafter, the present invention is described by reference to the accompanying drawings in more detail, wherein:
Fig. 1-2 shows some illustrative embodiments with the schematic diagram of simplifying.
detailed Description Of The Invention
In this application, with reference to accompanying drawing 1-2, wherein use the following drawings mark:
10 wood treatments,
20 thick slurry preparations, go the wooden and washing stage comprising digester, thick plasm scouring, oxygen,
30 bleachings, comprising bleaching stage and washing,
40 evaporimeters,
50 waste water disposal facilities, comprise the second clarifier,
60 chemical recovery, comprise melting dissolving, green liquor filtration, causticization and lime cycle stage,
70 recovery boilers, and
80 drying machines.
Term " former water processing establishment " refers to fresh water treatment facility.
Term " effluent treatment facility " refers to waste water disposal facility.
Term " ECF " refers to not containing elemental chlorine.
Term " TCF " refers to completely not chloride.
Term " NPE " refers to non-process element (non-process elements).NPE is from process equipment, and from the inorganic substances of timber, former water and chemical substance, they do not need to process yet sometimes.
Term " Adt " represents the air dry metric ton number of 90% dry chemical paper pulp.
Sealing water is the water for sealing in vavuum pump.
Ejector condenser cooling water is to be directed to the water that directly contacts with steam in ejector condenser or owing to directly contacting the water of generation with steam.
Gravity table is for make the device of sludge dewatering by wastewater treatment permeability band.Gravity table shower water is used for washing described band.
Drum-type displacement washing device is going barrel, and the pulp mat wherein being formed by paper pulp on the outer filtering surface of drum is washed, with the inside to drum by the liquid displacement in pad.
It is the water of discharging from boiler that boiler is discharged water, to avoid impurity in continuous steam evaporation process to concentrate.
The white liquid condensing groove of chemical recovery device is the groove that contains to come in the white liquid facility of secondary condensate of flash-pot.The process water that is transported to this place can be used from the washing operation in causticization facility with condensate one.
Thin liquid groove is the weak white liquor storage in white liquid facility.Coming the secondary condensate of flash-pot to be transported to this groove dilutes.
Term " effluent " represents waste water.Effluent is transported to the waste water disposal facility for purge process.Effluent can comprise for example bleaching effluent and ash leaching purging thing (ash leaching purge). in addition, effluent can contain wood treatment effluent.
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.More preferably, bleaching effluent forms by bleaching filter liquor.Bleaching filter liquor contains acidity and/or basic stream.Preferably, bleaching effluent fibre-bearing not.
Term " EOP " refers to use the alkaline extraction stage in the pulp bleaching process that oxygen and peroxide carry out as extra chemical substance.
The general object of the boiling operation in the production of chemical pulp of bleaching is recycled fiber from be transported to the fragment digester, specifically utilize chemicals and heating remove the lignin of viscose fibre and remove after by causing, in procedure, bubble and the wood extractive of precipitation occur.Therefore, in pulping process, normal use can be dissolved try one's best many lignin and as far as possible few cellulosic chemicals.Conventionally, the method for the chemical pulp of manufacture bleaching comprises slurrying, washing, screening, bleaching and cleaning stage.At present, sulfate boiling is the most frequently used method of manufcturing paper pulp, and also referred to as brown paper boiling or slurrying, it uses NaOH (NaOH) and vulcanized sodium (Na
2s) mixture.Method for cooking can be based on comprising a digester or several digesters boiling at intermittence or continuous cooking.
Thick slurry after boiling process is processed and is preferably included washing process, oxygen stage, and screening, then washs.Conventionally, oxygen in the stage last washing facility accept the washing lotion that purity is the highest, to promote association with pulp bleaching, the filtrate obtaining from this last washing facility is used as washing lotion dilution according to countercurrent washing principle.When reclaiming filtrate from the first thick plasm scouring equipment, filtrate can be delivered directly to forward to black liquor vaporizing equipment, or can in digester plant process for dilution with replace, then with black liquor stream, finish.After the in the end washing stage, bleaching process can lead paper pulp.
With blanching step, improve brightness, cleannes and the brightness constancy of paper pulp.Remaining lignin is the principal element that affects color, therefore must be removed or make it to brighten.Conventionally, the object of bleached pulp is to continue delignification, and utilize bleached chemical thing, to remove in boiling and oxygen, after the stage, remain in any wooden thing in paper pulp, it is residual lignin, these lignin can not decompose, and are dissolved in boiling and oxygen in the stage, and can sacrifice paper output or fibre property.And, in bleaching process, remove chromogenic compound, and be oxidized to leuco-compounds.Conventionally, the pith of bleaching is on washer, the lignin of dissolving to be washed out from paper pulp after bleaching stage.
For the object of bleaching,
-can use chlorine (Cl
2), ozone (O
3) and/or peroxy acid (Paa and Caa) and the unit process of aromatics lignin, and/or
-conventionally can use chlorine dioxide (ClO
2) and/or oxygen (O
2) react with the lignin structure with free phenolic hydroxyl group, and/or
-can use hypochlorite (H) and/or hydrogen peroxide (H
2o
2) and some functional group reactionses.
But chemical pulp industry need to keep a kind of technology, wherein at least one stage, with chloride chemicals, paper pulp is bleached, making chlorine dioxide is the main chemicals in pulp mill's bleaching process.Therefore, advantageously to major general's chlorine dioxide (ClO
2) for bleaching object.
Bleaching effluent is an important source of biological and chemical oxygen consumption normally.For example, chloride inorganic compound and the organochlorine compound from the reaction of chlorine dioxide and/or chlorine may be retained in procedure.Bleaching process is separated from fiber by various lignin compounds, and these compounds are retained in effluent with the form of organic molecule.In addition, in bleaching stage, can use sulfuric acid to carry out pH adjusting, and the main chemicals that are hydrolyzed as hexenuronic acid (hexenuronic acid).In alkali stage, can also use NaOH to carry out pH adjusting and lignin extraction.In addition, according to bleaching order, in bleaching, can use oxygen and/or peroxide.But in elementary analysis, they should be such materials, they are negligible on the impact of for example purge process.
In an example, use hydrochloric acid to carry out pH adjusting, and/or use sulfur dioxide and/or other reductant to remove the chemical residue from bleaching process, remove unreacted bleached chemical thing.
Not only there is bleaching effluent in pulp mill, also has process water, and for example cooling water, seals water, slurry, rainwater and the timber process water of waste streams (reject flows), channel water, equipment.Described process water does not contact with pulping process conventionally, but timber process water and some derive from except the channel water of technique overflow, and they contact with pulping process.Therefore, the effluent of accumulation is mainly leakage and overflow therein, the interim effluent that equipment breaks and causes, and the slurry of equipment, derives from continuously or fabric (silk screen and felt) or the container of intermittently washing, derives from the leakage of discarding system.
As mentioned above, thick slurry is processed and is comprised at least one washing process.Advantageously, thick slurry is processed and is comprised:
-screening process,
-oxygen goes the wooden stage, and
-at least one washing stage after oxygen goes the wooden stage.
Screening process can be positioned at after digester purges, in the middle of washing process or afterwards, or after oxygen goes the wooden stage.Conventionally, after these process stages, be bleaching process, be preferably based on ECF technology, it comprises having one or more bleaching stages and the association with pulp bleaching facility that uses the possible stage of other known bleached chemical material based on using chlorine dioxide.Advantageously, bleaching process comprises at least one alkali stage, wherein preferably at least uses oxygen and/or peroxide.Can also use ozone stage, acid phase and chelate stage for removing heavy metal.
According to method of the present invention, at least comprise the alkaline boiling process for the production of paper pulp, preferably use the bleaching facility (wherein forming chloride effluent) of ECF bleaching, and for the treatment of the effluent purifying facility (waste water disposal facility) of bleaching facility effluent and/or other effluent of producing in pulp mill.Or, can use TCF bleaching to replace ECF bleaching.
Advantageously use ECF bleaching, wherein said bleaching comprises acidic phase and alkali stage simultaneously.ECF bleaching comprises all such bleaching process, comprises at least one chlorine dioxide stage and in any bleaching stage, does not use element state chlorine.At present for the modern ECF bleaching process of bleached pulp conventionally by least two, more advantageously at least three bleaching stages form, described bleaching stage preferably includes at least three washing facilitys.If use chlorine dioxide in a bleaching stage, the most frequently used dosage is 5-15kg act.Cl/adt paper pulp.For the chlorine dioxide dosages of cork, be generally 25-35kg/adt, for the chlorine dioxide dosages of hardwood, be generally 20-30kg/adt.If pulp mill also will further reduce the amount of organochlorine compound, the policy of pulp mill is normally processed it in pulp mill, rather than reduces the use of chlorine dioxide.
Pulp mill generally includes chemical recovery facility, and it comprises the evaporation process conventionally with the evaporation equipment being connected in series, and chemical recovery boilers is removed chloride from technical process, and for the production of the chemical production facility of boiling chemical substance.
The circulatory system of at least part of closure for the preparation of the chemical pulp of bleaching is applicable to the method for wherein at least part of water and other chemical substance recirculation and re-using, thereby farthest reduce refuse, processes.Described system is specially adapted to farthest reduce aqueous effluent, so the protection of the environment impact of avoiding effluent to dispose, and the value that can obviously not jeopardize process costs or salable item.Chlorine, potassium, calcium, manganese, silicon, aluminium, phosphorus, iron and barium are some elements that relate in the chemical pulp mills of bleaching.
Preferably, at least one effluent of waste water disposal facility is processed to line biological treatment is provided.When the ratio of harmful organic substance declines, biological treatment is effective especially, and described harmful organic substance mainly comprises lignin compound separated in bleaching, hemicellulose and the component that derives from extraction, and their form the major part of the effluent of bleaching facility.Have many compounds that derive from timber, the part in these compounds is chlorination, and a part is low-molecular-weight hydrocarbon.Because microorganism is only using the organic moiety of effluent as nutrient, all inorganic substances, at least inorganic elements is retained in effluent.Therefore, through the water of biological treatment, after for example by sedimentation separation solid fraction and liquid distillate, from the organic component aspect containing, obviously cleaner than the effluent of otherwise processing, but because it contains inorganic substances, conventionally it must be discharged from technical process.
As what carry out a biological disposal upon, supplementing or substituting, purification phase can be for example chemical treatment, its objective is by precipitation and removes for example metal, and partial organic substances matter is also removed thus.As the substituting or supplementing of above-mentioned stage, can use filtering technique, for example the method for ultrafiltration and/or based thin film technology and/or infiltration.In other words, as what carry out a biological disposal upon, supplementing or substituting, can use for example milipore filter, ion-exchange, chemical precipitation, sedimentation, flotation and/or filter and process effluent.
Fig. 1 shows an example of pulp mill.Conventionally, in pulp mill, fragment and white liquid are supplied to the digester for paper pulp boiling.After boiling, the processing stage that the paper pulp (so-called thick slurry) of process boiling being transported to washing and oxygen.Conventionally, hot water is for the described washing stage.Light/dark balance liquid from boiling operation is transported to evaporation stage from boiling operation, in this stage, some water is removed from light/dark balance liquid, therefore produce aterrimus liquid.From the water of light/dark balance liquids recovery, self-evaporating condensate, is preferably delivered in washing stage or thick slurry.The aterrimus liquid producing at evaporation stage is processed, to obtain green liquor.Further process green liquor, to obtain being reused for the white liquid of boiling.The processing stage of from the washing of thick slurry and oxygen out, paper pulp is transported to bleaching system.Bleaching system generally includes the several bleaching stages for bleached pulp.Bleaching system produces acid and alkaline effluent conventionally in bleached pulp, and these effluents are transported to waste water disposal facility conventionally.Paper pulp through bleaching is transported to paper mill or pulp dryer conventionally.
Fig. 2 shows some examples of process water circulation with the schematic diagram of simplifying.For example, these examples can be implemented in the pulp mill according to Fig. 1.
Preferably, process water is transported to wood treatment 10 at least partly.Process water is preferred for round log washing.As an alternative or supplement, process water is preferred for chopping operation.As an alternative or supplement, process water is preferred for fragment screening.As an alternative or supplement, process water is preferred for fragment conveying.
Preferably, the second clarifier filter liquor that a part of effluent that is transported to wood treatment 10 is comprised to waste water disposal facility.
Preferably, at least a portion process water is transported to thick slurry preparation facilities 20.Preferably, process water goes wooden washing and/or diluent liquid for oxygen.As an alternative or supplement, process water is preferred for the washing lotion of drum-type displacement (DD) washer dish.
The process water that is recycled to thick slurry preparation facilities 20 preferably comprises bleaching Nash pump sealing water.
Preferably, at least a portion process water is recycled at least one bleaching stage 30, and be preferred for following in listed one, two or three:
The washing lotion of-DD washer dish (drum-type displacement washing device),
The washing lotion of-pressurization wash mill,
The dilution of-washing stage and wherein liquid.
The process water that is recycled at least one bleaching stage 30 and washing step wherein preferably comprise following in listed a kind of, two kinds, three kinds or four kinds:
The secondary condensed water of-evaporimeter, and/or
-causticization ejector condenser cooling water, and/or
-bleaching Nash pump sealing water, and/or
-boiler is discharged water.
Above-mentioned process water is preferably bleached Nash pump sealing water.
Preferably, at least a portion process water is transported to drying machine 80, and is preferably used as shower water wherein.The process water that is recycled to drying machine 80 preferably comprise following in listed a kind of, two kinds, three kinds or four kinds:
The secondary condensed water of-evaporimeter,
-boiler is discharged water,
-bleaching Nash pump sealing water, and
-causticization ejector condenser cooling water.
Above-mentioned process water is preferably bleached Nash pump sealing water.
Preferably, at least a portion process water is transported to waste water disposal facility 50, is preferred for the shower water of gravity table at this process water.As the process water of the gravity table shower water of waste water disposal facility preferably comprise following in listed a kind of, two kinds, three kinds or four kinds:
The Nash pump sealing water of-bleaching system 30,
-from the ejector condenser cooling water of causticization,
Waste water after the-the second clarifier,
-evaporate secondary condensate liquid.
Preferably, at least a portion process water is recycled to chemical recovery device 60, and is preferred for thin liquid groove and/or white liquid condensing groove wherein.Process water for described chemical recovery 60 preferably comprises boiler discharge water.
Preferably, at least a portion process water in chemical pulp mills circulation is comprised in following water source a kind of, two kinds, three kinds, four kinds or five kinds:
-bleaching stage 30, preferably comprises EOP bleaching filter liquor and/or Nash pump sealing water,
-drying machine, preferably comprises plain boiled water,
-evaporimeter 40, preferably comprises condensate,
-recovery boiler 70, preferably comprises boiler and discharges water, and
-chemical recovery, preferably comprises ejector condenser cooling water and/or vavuum pump sealing water.
Preferably, at least a portion process water is in the interior circulation of bleaching stage 30.As an alternative or supplement, preferably, at least a portion process water is in interior circulation of chemical recovery stage 60.Therefore, the total amount of the total amount of the effluent of generation and required former water declines.As an alternative or supplement, in an example, at least a portion process water circulates within the wastewater treatment stage.But, the latter be preferred embodiment unlike other embodiment.
Due to the circulation of at least a portion process water, in waste water disposal facility, the total amount of the effluent of purifying can decline.In addition, the total amount of required former water (also referred to as fresh water) also declines conventionally.
Preferably, at least a portion is used as the slurry of DD washer screening dish from the water of Nash pump; The amount of the total amount of the effluent therefore, producing and required former water all declines.
In process water circulation, may there is filter.In this case, filter is preferred for gravity table shower water.Conventionally, without any need for other purification devices.Therefore, if described gravity table shower water is not the water re-using, according to the process water of the present invention's circulation they again as before process water conventionally without any need for purification step.
The water of different purity level also can merge, and makes them meet the required purity level in use location.
Table 1-3 shows some examples according to minimizing waste water of the present invention." waste water [the m of realization
3/ t] reduce " refer to following situation: in an example, the initial wastewater flow rate of pulp mill is about 22.5m
3/ t.
The waste water of table 1. fiber process line (fiberline) reduces
Waste water in table 2. chemical recovery and former water processing establishment reduces
Waste water in table 3. wood treatment reduces
One of ordinary skill in the art will readily recognize that in the environment that different embodiment of the present invention can be applied to be optimized the liquid stream of pulp mill.Therefore, obviously the present invention is not limited in above-mentioned embodiment, but can modify within the scope of the appended claims.
Claims (12)
1. in a method for chemical pulp mills treatment fluid stream, this system comprises:
-wood treatment device (10),
-slightly starch preparation facilities (20), it comprises the boiling for the production of paper pulp, washing, screening and oxygen go the wooden stage,
-bleaching system (30), for the paper pulp of producing is bleached,
-chemical recovery device (60),
-pulp dryer (80),
-recovery boiler (70), it produces boiler and discharges water,
-evaporimeter (40), it produces condensate,
-waste water disposal facility (50), and
-former water processing establishment,
Wherein, described method comprises following water source A) to G) at least one be delivered to following use location H) to U) and at least one, described water source A) to G) be:
-A) EOP from bleaching system (30) bleaches filter liquor,
-B) Nash pump from bleaching system (30) seals water,
-C) carry out the condensate of flash-pot (40),
-D) from the water of the second clarifier of waste water disposal facility (50),
-E) from the ejector condenser cooling water of chemical recovery device (60),
-F) vavuum pump from chemical recovery device (60) seals water, and
-G) from the boiler of recovery boiler (70), discharge water,
Described use location H) to U) be:
-H) round log of wood treatment device (10) washing,
-I) chopping of wood treatment device (10) operation,
-J) fragment of wood treatment device (10) screening,
-K) the fragment conveyer of wood treatment device (10),
-L) oxygen of slightly starching preparation facilities (20) goes wooden washing,
-M) slightly starch the dilution water of preparation facilities (20),
-N) the drum-type displacement washing device dish of bleaching system (30),
-O) washing step of bleaching system (30),
-P) dilution water of bleaching system (30),
-Q) the drying machine shower water of pulp dryer (80),
-R) the gravity table shower water of waste water disposal facility (50),
-S) the thin liquid groove of chemical recovery device (60),
-T) the white liquid condensing groove of chemical recovery device (60), and
-U) pulp mill's water system,
Described conveying is by following pairing, described water source to be connected with described use location:
-from water source A or D to position H,
-from water source A or D to position I,
-from water source A or D to position J,
-from water source A or D to position K,
-from water source A, B or D to position L,
-from water source A, B or D to position M,
-from water source B to position N, O, P or Q,
-from water source A, B, C, D, E or F to position R,
-from water source G to position S or T, or
-from water source E or F to position U,
Wherein, described connection is according to selecting the one or more pairings in above-mentioned pairing to implement.
2. the method for claim 1, is characterized in that, by following pairing, described water source is connected with described use location:
-from water source A or D to position H,
-from water source A or D to position I,
-from water source A or D to position J,
-from water source A or D to position K,
-from water source A, B or D to position L,
-from water source A, B or D to position M,
-from water source B to position N, O, P or Q,
-from water source A, B, C, D, E or F to position R, or
-from water source G to position S or T.
3. method as claimed in claim 1 or 2, is characterized in that, the Nash pump sealing water from bleaching system (30) is transported to pulp dryer (80), uses this part water as the shower water (from water source B to position Q) of drying machine.
4. the method according to any one of the preceding claims, it is characterized in that, at least a portion is transported to the alkaline extraction stage from the Nash pump sealing water of bleaching system, in this stage, uses oxygen and peroxide as extra chemical reagent (from water source B to position O or P).
5. the method according to any one of the preceding claims, is characterized in that, at least a portion is transported to the screening dish (from water source B to position N) of the drum-type displacement washing device in thick slurry preparation (20) from the Nash pump sealing water of bleaching system.
6. the method according to any one of the preceding claims, is characterized in that, described chemical recovery device comprises weak white liquor storage and white slurry filter vavuum pump, and described method comprises:
-by least a portion starch in vain filter vavuum pump water and or ejector condenser cooling water be transported in weak white liquor storage (from water source E and/or F to position S).
7. method as claimed in claim 6, is characterized in that, will starch in vain filter vavuum pump water and ejector condenser cooling water and merge, and be transported in weak white liquor storage.
8. the method according to any one of the preceding claims, is characterized in that, described chemical recovery device comprises rare white liquid condensing groove, and described method comprises:
-at least a portion boiler is discharged to water be transported in described white liquid condensing groove (from water source G to position T).
9. the method according to any one of the preceding claims, is characterized in that, described system comprises dregs filter vavuum pump and the Treatment of Sludge region of waste water disposal facility, and described method comprises:
-at least a portion ejector condenser cooling water and/or dregs filter vavuum pump water are transported to the washing step (from water source E and/or F to position R) in Treatment of Sludge region.
10. the method according to any one of the preceding claims, is characterized in that, the process water of at least a portion circulates in bleaching system.
11. the method according to any one of the preceding claims, is characterized in that, the process water of at least a portion circulates in chemical recovery device (60).
12. 1 kinds of systems at chemical pulp mills treatment fluid stream, this system comprises:
-wood treatment device (10),
-slightly starch preparation facilities (20), it comprises the boiling for the production of paper pulp, washing, screening and oxygen go the wooden stage,
-bleaching system (30), for bleaching the paper pulp of production,
-chemical recovery device (60),
-recovery boiler (70),
-evaporimeter (40),
-pulp dryer (80),
-waste water disposal facility (50), and
-former water processing establishment,
Wherein said system also comprises following listed A) to G) at least one be connected to
Lower listed operating position H) to U) at least one:
-A) be applicable to transport the equipment from the EOP of bleaching system (30) bleaching filter liquor,
-B) be applicable to transport the equipment from the Nash pump sealing water of bleaching system (30),
-C) be applicable to transport the equipment of the condensate of flash-pot (40),
-D) be applicable to transport the equipment from the water of the second clarifier of waste water disposal facility (50),
-E) be applicable to transport the equipment from the ejector condenser cooling water of chemical recovery device (60),
-F) be applicable to transport the equipment from the vavuum pump sealing water of chemical recovery device (60), and
-G) be applicable to transport the equipment of discharging water from the boiler of recovery boiler (70),
Described operating position H) to U) be:
-H) round log of wood treatment device (10) washing,
-I) chopping of wood treatment device (10) operation,
-J) fragment of wood treatment device (10) screening,
-K) fragment of wood treatment device (10) is carried,
-L) oxygen of slightly starching preparation facilities (20) goes wooden washing,
-M) slightly starch the dilution water of preparation facilities (20),
-N) the drum-type displacement washing device dish of bleaching system (30),
-O) washing step of bleaching system (30),
-P) dilution water of bleaching system (30),
-Q) the drying machine shower water of pulp dryer (80),
-R) the gravity table shower water of waste water disposal facility (50),
-S) the thin liquid groove of chemical recovery device (60),
-T) the white liquid condensing groove of chemical recovery device (60), and
-U) pulp mill's water system,
Described system comprises at least one in following listed equipment connection:
-A or D arrive position H,
-A or D arrive position I,
-A or D arrive position J,
-A or D arrive position K,
-A, B or D arrive position L,
-A, B or D arrive position M,
-B arrives position N, O, P or Q,
-A, B, C, D, E or F arrive position R,
-G arrives position S or T, or
-E or F arrive position U,
Wherein, described connection is to implement according to the one or more pairings that are selected from above-mentioned pairing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910294531.9A CN109811572A (en) | 2012-03-12 | 2013-03-12 | A kind of method and system in chemical pulp mills processing liquid stream |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20125265 | 2012-03-12 | ||
| FI20125265A FI129114B (en) | 2012-03-12 | 2012-03-12 | A method and a system for treating liquid flows at a chemical pulp mill |
| PCT/FI2013/050273 WO2013135959A2 (en) | 2012-03-12 | 2013-03-12 | A method and a system for treating liquid flows at a chemical pulp mill |
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| CN201910294531.9A Division CN109811572A (en) | 2012-03-12 | 2013-03-12 | A kind of method and system in chemical pulp mills processing liquid stream |
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| CN104169492A true CN104169492A (en) | 2014-11-26 |
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| CN201380013881.4A Pending CN104160088A (en) | 2012-03-12 | 2013-03-12 | A method and a system for treating liquid flows at a chemical pulp mill |
| CN201380013968.1A Pending CN104169492A (en) | 2012-03-12 | 2013-03-12 | Method and system for treating liquid flows at chemical pulp mill |
| CN201910294531.9A Pending CN109811572A (en) | 2012-03-12 | 2013-03-12 | A kind of method and system in chemical pulp mills processing liquid stream |
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| Country | Link |
|---|---|
| CN (3) | CN104160088A (en) |
| BR (2) | BR112014022418B1 (en) |
| FI (1) | FI129114B (en) |
| RU (2) | RU2621662C2 (en) |
| UY (1) | UY34671A (en) |
| WO (2) | WO2013135959A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109423905A (en) * | 2017-08-30 | 2019-03-05 | 黑龙江如柏科技有限公司 | A kind of paper pulp production line system of no discharging of waste liquid |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI129114B (en) * | 2012-03-12 | 2021-07-15 | Upm Kymmene Corp | A method and a system for treating liquid flows at a chemical pulp mill |
| CN109423900A (en) * | 2017-08-30 | 2019-03-05 | 黑龙江如柏科技有限公司 | A kind of paper pulp production line system |
| CN116716753B (en) * | 2023-06-30 | 2024-12-31 | 重庆理文制浆有限公司 | Pulping system |
Citations (4)
| 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 |
| CN1379152A (en) * | 2001-11-13 | 2002-11-13 | 徐守才 | Process for reclaiming waste digestion liquid of alkaline (or neutral) straw pulp generated by sodium sulfite method |
| WO2004106624A1 (en) * | 2003-06-03 | 2004-12-09 | Pacific Pulp Resources Inc. | Method for producing pulp and lignin |
| CN101688362A (en) * | 2007-06-15 | 2010-03-31 | 安德里兹公司 | Method for treating liquid flows at a chemical pulp mill |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5380402A (en) * | 1992-07-30 | 1995-01-10 | Kamyr, Inc. | Reducing pulp mill liquid discharge |
| US5470480A (en) * | 1994-05-09 | 1995-11-28 | Eka Nobel, Inc. | Process for treating waste water effluent |
| 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 |
| SE9703365D0 (en) * | 1997-09-18 | 1997-09-18 | Kvaerner Pulping Tech | Method in connection with impregnation and digestion of lignocelulosic material |
| RU2211836C1 (en) * | 2002-04-24 | 2003-09-10 | Кочетов Анатолий Сергеевич | Method of processing larch wood to isolate dehydroquercitine and apparatus |
| FI122241B (en) * | 2007-06-15 | 2011-10-31 | Andritz Oy | Procedure in connection with pulp washing at a pulp mill |
| FI20080298L (en) * | 2007-06-15 | 2009-10-22 | Andritz Oy | Procedure for the treatment and use of liquid streams in a pulp mill |
| RU2526013C2 (en) * | 2010-03-23 | 2014-08-20 | Интернэшнл Пэйпа Кампани | Advanced system and method of recycling filtrate of chemi-thermomechanical pulp |
| FI129114B (en) * | 2012-03-12 | 2021-07-15 | Upm Kymmene Corp | A method and a system for treating liquid flows at a chemical pulp mill |
-
2012
- 2012-03-12 FI FI20125265A patent/FI129114B/en active IP Right Grant
-
2013
- 2013-03-12 UY UY0001034671A patent/UY34671A/en active IP Right Grant
- 2013-03-12 RU RU2014136221A patent/RU2621662C2/en active
- 2013-03-12 CN CN201380013881.4A patent/CN104160088A/en active Pending
- 2013-03-12 CN CN201380013968.1A patent/CN104169492A/en active Pending
- 2013-03-12 WO PCT/FI2013/050273 patent/WO2013135959A2/en active Application Filing
- 2013-03-12 CN CN201910294531.9A patent/CN109811572A/en active Pending
- 2013-03-12 WO PCT/FI2013/050272 patent/WO2013135958A2/en active Application Filing
- 2013-03-12 BR BR112014022418-8A patent/BR112014022418B1/en active IP Right Grant
- 2013-03-12 RU RU2014136218A patent/RU2636560C2/en active
- 2013-03-12 BR BR112014022417-0A patent/BR112014022417B1/en active IP Right Grant
Patent Citations (4)
| 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 |
| CN1379152A (en) * | 2001-11-13 | 2002-11-13 | 徐守才 | Process for reclaiming waste digestion liquid of alkaline (or neutral) straw pulp generated by sodium sulfite method |
| WO2004106624A1 (en) * | 2003-06-03 | 2004-12-09 | Pacific Pulp Resources Inc. | Method for producing pulp and lignin |
| CN101688362A (en) * | 2007-06-15 | 2010-03-31 | 安德里兹公司 | Method for treating liquid flows at a chemical pulp mill |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109423905A (en) * | 2017-08-30 | 2019-03-05 | 黑龙江如柏科技有限公司 | A kind of paper pulp production line system of no discharging of waste liquid |
Also Published As
| Publication number | Publication date |
|---|---|
| FI129114B (en) | 2021-07-15 |
| CN109811572A (en) | 2019-05-28 |
| BR112014022417A2 (en) | 2017-06-20 |
| RU2636560C2 (en) | 2017-11-23 |
| UY34671A (en) | 2013-10-31 |
| WO2013135959A3 (en) | 2014-03-20 |
| WO2013135958A3 (en) | 2013-11-14 |
| BR112014022418B1 (en) | 2021-09-08 |
| BR112014022417B1 (en) | 2021-06-29 |
| WO2013135958A2 (en) | 2013-09-19 |
| BR112014022418A2 (en) | 2017-06-20 |
| RU2621662C2 (en) | 2017-06-06 |
| RU2014136221A (en) | 2016-04-27 |
| RU2014136218A (en) | 2016-04-27 |
| WO2013135959A2 (en) | 2013-09-19 |
| CN104160088A (en) | 2014-11-19 |
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