CN109811572A - A kind of method and system in chemical pulp mills processing liquid stream - Google Patents
A kind of method and system in chemical pulp mills processing liquid stream Download PDFInfo
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- CN109811572A CN109811572A CN201910294531.9A CN201910294531A CN109811572A CN 109811572 A CN109811572 A CN 109811572A CN 201910294531 A CN201910294531 A CN 201910294531A CN 109811572 A CN109811572 A CN 109811572A
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- water
- water source
- bleaching
- pulp
- washing
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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
- D21C11/0021—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
Abstract
The present invention relates to a kind of methods in chemical pulp mills processing liquid stream.This method includes that at least one scheduled water flow is transported to at least one predetermined area of system.Moreover, it relates to the system for handling liquid stream.
Description
The application is the applying date on March 12nd, 2013, the artificial UPM-Kymmene Corporation of application, entitled " one kind exists
The division of the Chinese patent application 201380013968.1 of the method and system of chemical pulp mills processing liquid stream ".
Invention field
The present invention relates to a kind of method and systems in chemical pulp mills processing liquid stream.
Background technique
The effluent of chemical pulp mills is handled, usually in waste water disposal facility to reduce environmentally harmful compound
Amount.The use and the volume of effluent of water, such as the cost of supply raw water are reduced there are many motivations, may be limited
Water supply, save energy, and reduce fiber and a possibility that chemical wear.Currently, pulp mill has been typically established at very sternly
In the region and environment of lattice ring guaranteed request.For example, having stringent limitation to the amount for the water that chemical pulp mills use.Therefore, it is possible to
Pulp mill can not be established in satisfactory place in other aspects due to water resource.In many cases it is desirable to more clean
Environment, it is desirable that the substance of pulp mill's production is smaller to the harm of environment.Therefore, at present it is important that a kind of scheme is found, with hair
Existing more closed water round-robin method.
Summary of the invention
The present invention discloses a kind of method and system in chemical pulp mills processing liquid stream.The feature of some aspects of the invention
It is stated in independent claims 1 and 12.Various embodiments of the invention are described in dependent claims.
System according to the present invention includes:
At least one treating of wood device,
Slightly starch preparation facilities comprising for producing the cooking of paper pulp, washing, screening and oxygen go the wooden stage,
Bleaching system comprising for bleaching stage to bleach paper pulp produced, which includes Na Shi (Nash) pump
Sealing water and/or bleaching filtrate,
Chemical recovery plant, may include ejector condenser cooling water and/or vacuum pump sealing water,
Boiler is recycled, also water is discharged in generation boiler, and
Evaporator generates condensate.
The system may include pulp dryer.But the system can not also include the pulp dryer.
Preferably, at least part process water is transported to the process water for being re-used as pulp mill.
Preferably, for including filtering out the EOP bleaching from bleaching system in the method for chemical pulp mills processing liquid stream
Liquid is transported to the process water for being re-used as at least one processing stage of pulp mill.The application can be the wood for the treatment of of wood device
Material processing, the thick oxygen for starching preparation facilities remove the gravity table shower water in wooden washing or dilution water or waste water disposal facility.
It as an alternative or supplement, include pumping the Na Shi (Nash) from bleaching system for the method in chemical pulp mills processing liquid stream
Sealing water is transported to the process water for being re-used as at least one pulp mill's processing stage.The application can be thick slurry preparation facilities
In oxygen remove wooden washing or dilution water, the drum-type displacement washing device disk in bleaching system, the washing step of bleaching system or dilute
Water is released, the drying machine shower water in pulp dryer or the gravity table shower water in waste water disposal facility.As substitution or
Supplement, for the method for chemical pulp mills processing liquid stream include future flash-pot condensate be transported to and be re-used as at least
The process water of one pulp mill's processing stage.The application can be the gravity table shower water in waste water disposal facility.Make
To be substituted or supplemented, the method for handling liquid stream in chemical pulp mills includes will be from the second clarifier of waste water disposal facility
Water is transported to the process water for being re-used as at least one pulp mill's processing stage.The application can be the wood for the treatment of of wood device
Material processing, the thick oxygen for starching preparation facilities remove the gravity table shower water in wooden washing or dilution water or waste water disposal facility.
As an alternative or supplement, for chemical pulp mills processing liquid stream method include will be from the injection condensing of chemical recovery plant
Device cooling water is transported to the process water for being re-used as at least one pulp mill's processing stage.The application can be wastewater treatment and set
Apply or pulp mill's water system in gravity table shower water.As an alternative or supplement, for handling liquid stream in chemical pulp mills
Method include the vacuum pump sealing water from chemical recovery plant is transported to be re-used as at least one pulp mill processing rank
The process water of section.The application can be the gravity table shower water in waste water disposal facility or pulp mill's water system.As
It is substituted or supplemented, for including being transported to the boiler discharge water from recycling boiler in the method for chemical pulp mills processing liquid stream
It is re-used as the process water of at least one pulp mill's processing stage.The application can be thin liquid slot in chemical recovery plant or
White liquor condensate tank(trap).
It is preferred that one kind, two or three of above-mentioned water, it is more preferable four kinds or five kinds of above-mentioned water, most preferably six kinds or seven kinds it is above-mentioned
Water is for the present invention.But " water from the second clarifier of waste water disposal facility " is preferably excluded except above-mentioned, because it
It is preferred embodiment unlike other water.
Preferably, at least one above-mentioned water guiding is used in the round log washing for the treatment of of wood device.As substitution or mend
It fills, at least one above-mentioned water guiding is used for the chopping operations for the treatment of of wood device.It as an alternative or supplement, will be at least one
The fragment that water guiding is stated for treating of wood device sieves.As an alternative or supplement, at least one above-mentioned water guiding is used for wood
The fragment of material processing unit conveys.As an alternative or supplement, at least one above-mentioned water guiding is used to slightly starch the oxygen of preparation facilities
Go wooden washing.As an alternative or supplement, at least one above-mentioned water guiding is used to slightly starch the dilution water of preparation facilities.As replacing
At least one above-mentioned water guiding is used for drum-type displacement washing device (the Drum Displacement of bleaching system by generation or supplement
Washer, i.e. DD washer) disk.As an alternative or supplement, at least one above-mentioned water guiding is used for the purge step of bleaching system
Suddenly.As an alternative or supplement, at least one above-mentioned water guiding is used for the dilution water of bleaching system.As an alternative or supplement, will
At least one above-mentioned water guiding is used for the drying machine shower water of pulp dryer.It as an alternative or supplement, will be at least one above-mentioned
Water guiding is used for the gravity table shower water of waste water disposal facility.As an alternative or supplement, at least one above-mentioned water is oriented to
Thin liquid slot for chemical recovery plant.As an alternative or supplement, at least one above-mentioned water guiding is used for chemical recovery plant
White liquor condensate tank(trap).
But " oxygen of thick slurry preparation facilities goes wooden washing " and " dilution water in thick slurry preparation facilities " preferably excludes
Outside, because they are not preferred enough for other.
Additionally or alternatively, the method preferably includes the process waters by least part from Nash pump sealing water
It is transported in the following one, two or three stage:
At least one slightly starches preparatory phase,
At least one bleaching stage, and
The drying machine shower water of pulp dryer.
Additionally or alternatively, the method preferably includes at least part is come from causticization ejector condenser cooling water
And/or the process water of boiler discharge water was transported in one or two following stage:
Waste water disposal facility is used for gravity table shower water, and/or
Chemical recovery.
Additionally or alternatively, this method, which is preferably included, is transported to chemical recovery at least part boiler discharge water
In white liquor condensate tank(trap).Liquid stock can be improved in this way and in O2The more use of secondary condensates in washing after processing.As
Substituted or supplemented, the method preferably includes pump at least part ejector condenser cooling water and/or dregs Filter Vacuum
The washing step in Treatment of Sludge region is transported to water.
Be preferred for chemical pulp mills handle liquid stream system include:
Treating of wood device,
Slightly starch preparation facilities comprising for producing the cooking (including digester) of paper pulp, wash, screening and oxygen remove wood
The matter stage,
Bleaching system,
Chemical recovery plant, and
Evaporator.
In addition, the system is preferably included for the process water for carrying out flash-pot at least partially to be transported to treating of wood
The conveying equipment of device and/or thick slurry preparation facilities and/or bleaching system and/or pulp dryer and/or chemical recovery plant.
In addition, the system preferably includes to be transported to drift for the process water of the drying machine by least part from paper pulp
The conveying equipment of at least one bleaching stage of white device.
In addition, the system preferably includes to return at least part to be transported to chemistry from the process water of recycling boiler
At least one chemical recovery stage of receiving apparatus and/or the conveying equipment of pulp dryer.
In addition, the system is preferably included at least part to be come from causticization ejector condenser cooling water and/or pot
Fire grate water outlet is transported to the weight for the treatment of of wood device and/or thick slurry preparation facilities and/or bleaching system and/or waste water disposal facility
The conveying equipment in the chemical recovery stage of power sorting table shower water and/or chemical recovery plant.
In addition, the system is preferably included for the work as Nash pump sealing water by least part from bleaching system
Skill is transported to the conveying equipment of thick slurry preparation facilities and/or bleaching system and/or chemical recovery plant with water.
The conveying equipment preferably at least includes one or more pipelines and pump.
Therefore, according to the present invention, the process water substitution that at least part raw water is recycled needed for pulp mill.Change speech
It, a part of process water recycles between different processing stages and/or in processing stage, most preferably not in wastewater treatment
Any processing is carried out in facility.Therefore, have benefited from the present invention, the amount of generated waste water can be substantially reduced.
Therefore, have benefited from the present invention, be capable of providing a kind of system with following ability:
The environment that chemical pulp mills can be reduced influences, and
The raw water dosage of chemical pulp mills can be reduced.
It can also saving energy and chemical reagent, it is thus substantially reduced operating cost.
The present invention can be implemented in the chemical pulp mills with following procedure or device: digestion process, at least one bleaching
Stage, chemical recovery and various reactors well known by persons skilled in the art, container, pump, mixer, filter etc..
Detailed description of the invention
Hereinafter, in conjunction with attached drawing, the present invention will be described in more detail, in which:
Fig. 1-2 shows some illustrative embodiments with simplified schematic diagram.
Detailed description of the invention
In this application, with reference to attached drawing 1-2, wherein being marked using the following drawings:
10 treating of woods,
20 thick slurry preparations, go the wooden and washing stage including digester, thick plasm scouring, oxygen,
30 bleachings, including bleaching stage and washing,
40 evaporators,
50 waste water disposal facilities, including the second clarifier,
60 chemical recoveries, including melting dissolution, green liquor filtering, causticization and lime cycle stage,
70 recycling boilers, and
80 drying machines.
Term " original sub-block facility " refers to fresh water processing establishment.
Term " effluent treatment facility " refers to waste water disposal facility.
Term " ECF " refers to without elemental chlorine.
Term " TCF ", which refers to, is entirely free of chlorine.
Term " NPE " refers to Non-Process Elements (non-process elements).NPE is from process equipment, sometimes
Inorganic substances from timber, raw water and chemical substance, they do not need to be handled.
Term " Adt " 90% dry chemical paper pulp of expression is air-dried a tonne number.
Sealing water is the water in vacuum pump for sealing.
Ejector condenser cooling water be directed to the water directly contacted with the steam in ejector condenser or due to steaming
Vapour directly contacts the water of generation.
Gravity table is the device for making sludge dewatering by permeability band in wastewater treatment.Gravity table spray
Water drenching is for washing the band.
Drum-type displacement washing device is going barrel, wherein be washed on bulging outer filtering surface by the pulp mat that paper pulp is formed,
With the liquid displacement in padding to the inside of drum.
Boiler be discharged water be the water being discharged from boiler, to avoid in continuous steam evaporation process impurity be concentrated.
The white liquor condensate tank(trap) of chemical recovery plant is the slot in the white liquor facility containing the secondary condensate for carrying out flash-pot.
It is transported to the washing operation that the process water at this can be used in causticization facility together with condensate.
Thin liquid slot is the weak white liquor storage in white liquor facility.Come flash-pot secondary condensate be transported to the slot carry out it is dilute
It releases.
Term " effluent " indicates waste water.Effluent is transported to the waste water disposal facility for being used for purification process.Effluent
It may include that such as bleaching effluent and ash leach purging object (ash leaching purge) in addition, effluent can contain timber
Handle effluent.
Term " bleaching effluent " refers to the effluent from bleaching system described in the text and washing step.Preferably, it floats
White effluent contains bleaching filter liquor.It is highly preferred that bleaching effluent is made of bleaching filter liquor.Bleaching filter liquor contains acidity
And/or basic stream.Preferably, bleaching effluent not fibre-bearing.
Term " EOP " refers to the alkali in the pulp bleaching process for using oxygen and peroxide to carry out as additional chemical substance
Property extraction stages.
The general purpose of cooking operation in the production of the chemical pulp of bleaching is from the fragment being transported in digester
Middle recycled fiber, specifically remove the lignin of viscose fibre using chemicals and heating and remove will lead to method mistake later
The wood extractive for blistering and precipitating in journey.Therefore, lignin more as far as possible can be dissolved and use up by being often used in pulping process
Measure the chemicals of few cellulose.In general, the method for the chemical pulp of manufacture bleaching includes slurrying, washing, screening, bleaching and cleaning
Stage.Currently, sulfate cooking is most common method of manufcturing paper pulp, also referred to as brown paper cooking or slurrying uses hydrogen-oxygen
Change sodium (NaOH) and vulcanized sodium (Na2S mixture).Method for cooking can be based on including a digester or several digesters
Interval cooks or continuous cooking.
Thick slurry processing after boiling process preferably includes washing process, oxygen stage, and screening, is then washed.
In general, washing facility last in the oxygen stage receives the highest washing lotion of purity, to promote paper pulp to bleach, from the last washing facility
Obtained filtrate is used as washing lotion according to countercurrent washing principle and dilutes use.When from the first thick plasm scouring equipment recycling filtrate,
Filtrate can be delivered directly to forward to black liquor vaporizing equipment, or can be used for during digester plant being used to dilute and replace
It changes, is then terminated with black liquor stream.After the last washing stage, paper pulp can be oriented to bleaching process.
Brightness, cleannes and the brightness constancy of paper pulp are improved using blanching step.Remaining lignin is to influence face
The principal element of color, therefore must be removed or it is made to brighten.In general, the purpose of bleached pulp is to continue with delignification, and
And bleached chemical object is utilized, it is cooking to remove and is remaining in any wooden object in paper pulp, i.e. residual lignin after the oxygen stage,
These lignin will not decompose, and be dissolved in cooking and oxygen stage, without sacrificing paper output or fibre property.Moreover,
In bleaching process, chromogenic compound is removed, and be oxidized as leuco-compounds.In general, the pith of bleaching is to bleach
The lignin of dissolution is washed out from paper pulp on washer after stage.
For the purpose of bleaching,
Chlorine (Cl can be used2), ozone (O3) and/or peroxy acid (Paa and Caa) and the unit process of aromatics lignin, and/
Or
Chlorine dioxide (ClO usually can be used2) and/or oxygen (O2) anti-with the lignin structure with free phenolic hydroxyl group
It answers, and/or
Hypochlorite (H) and/or hydrogen peroxide (H can be used2O2) and some functional group reactions.
But chemical pulp industry needs to keep a kind of technology, wherein with the chemicals containing chlorine at least one stage
Paper pulp is bleached, so that chlorine dioxide is the main chemical in pulp mill's bleaching process.It would thus be advantageous at least will
Chlorine dioxide (ClO2) for bleaching purpose.
Bleaching effluent is usually an important source of biological and chemical oxygen consumption.For example, from chlorine dioxide and/or
The inorganic compound containing chlorine and organochlorine compound of the reaction of chlorine may be retained in during method.Bleaching process will be various wooden
Plain compound is separated from fiber, these compounds are retained in effluent in the form of organic molecule.In addition, in bleaching stage
In can be used sulfuric acid carry out pH adjusting, and be used as hexenuronic acid (hexenuronic acid) hydrolysis main chemical.
In alkali stage, sodium hydroxide can also be used to carry out, and pH is adjusted and lignin extracts.In addition to this, according to bleaching sequence,
Oxygen and/or peroxide can be used in bleaching.But in elemental analysis, they should be such substance, i.e., it
Influence to such as purification process can be ignored.
In one example, pH adjusting is carried out using hydrochloric acid, and/or uses sulfur dioxide and/or other reducing agents
The chemical residue from bleaching process is removed, that is, removes unreacted bleached chemical object.
Not only there is bleaching effluent in pulp mill, and there are also process water, such as cooling water, sealing water, waste streams (reject
Flows), channel water, the slurry of equipment, rainwater and timber process water.The process water usually not with pulping process
Contact, but timber processing water and some except the channel water of technique overflow, they are contacted with pulping process.Therefore,
It is mainly leakage and overflow in the effluent wherein accumulated, interim effluent caused by equipment ruptures, the slurry of equipment,
From the fabric (silk screen and felt) or container accomplished continuously or intermittently washed, from the leakage of discarding system.
As described above, thick slurry processing includes at least one washing process.Advantageously, thick slurry processing includes:
Screening process,
Oxygen is gone the wooden stage, and
At least one washing stage after oxygen goes the wooden stage.
Screening process can be located at after digester purging, among washing process or later, or in oxygen go the wooden stage
Later.In general, being bleaching process after these process stages, it is preferably based on ECF technology comprising be based on one or more
The paper pulp bleaching plants of bleaching stage using chlorine dioxide and the possibility stage using other known bleaching chemical.Favorably
, bleaching process includes at least one alkali stage, wherein preferably at least using oxygen and/or peroxide.It can also use
For removing ozone stage, acid phase and the chelate stage of heavy metal.
Method according to the present invention includes at least the alkaline boiling process for producing paper pulp, it is preferred to use ECF bleaching
Bleaching plants (wherein formed effluent containing chlorine), and for handling bleaching plants effluent and/or in pulp mill's generation
The effluent of other effluents purifies facility (waste water disposal facility).Alternatively, TCF bleaching can be used that ECF is replaced to bleach.
It is advantageously bleached using ECF, wherein described bleach while including acidic phase and alkali stage.ECF bleaching packet
All such bleaching process are included, that is, include at least one chlorine dioxide stage and all do not use element in any bleaching stage
State chlorine.Modern ECF bleaching process currently used for bleached pulp is usually by least two, more advantageously at least three bleaching ranks
Duan Zucheng, the bleaching stage preferably include at least three washing facilitys.If using chlorine dioxide in a bleaching stage,
Then most common dosage is 5-15kg act.Cl/adt paper pulp.Chlorine dioxide dosages for cork are usually 25-35kg/
Adt, the chlorine dioxide dosages for hardwood are usually 20-30kg/adt.If pulp mill will also be further reduced organic chloride
The amount of object is closed, then the policy of pulp mill is usually the use for handling in pulp mill it, rather than reducing chlorine dioxide.
Pulp mill generally includes chemical recovery facility comprising usually has the evaporation for the evaporation equipment being connected in series
Journey, chemical recovery boilers remove chloride from technical process, and the chemical production for producing cooking chemical substance is set
It applies.
The circulatory system being at least partly closed for being used to prepare the chemical pulp of bleaching is suitable for the water of wherein at least part
The method for recycling and re-using with other chemical substances, to farthest reduce waste processing.The system is special
Suitable for farthest reducing aqueous effluent, therefore the influence for protecting environment that effluent is avoided to dispose, without obviously endangering
And the value of process costs or salable item.Chlorine, potassium, calcium, manganese, silicon, aluminium, phosphorus, iron and barium are related in the chemical pulp mills bleached
And some elements.
Preferably, biological treatment is provided at least one effluent processing line of waste water disposal facility.Work as harmful organic substance
Ratio decline when, biological treatment be it is particularly effective, the harmful organic substance mainly include bleaching in separate it is lignified
Object, hemicellulose and the component from extraction are closed, they constitute the major part of the effluent of bleaching plants.There are many sources
A part in the compound of timber, these compounds is chlorination, and a part is the hydrocarbon of low molecular weight.Cause
It is microorganism only using the organic moiety of effluent as nutrient, all inorganic substances, at least inorganic elements are retained in effluent.
Therefore, by the water of biological treatment, after for example by sedimentation separation solid fraction and liquid distillate, from the organic component contained
For aspect, hence it is evident that the effluent than otherwise handling is cleaner, but since it contains inorganic substances, it is often necessary to it will
It is discharged from technical process.
As the supplement or substitution of biological treatment, purification phase, which can be, to be for example chemically treated, and the purpose is to pass through precipitating
Such as metal is removed, thus partial organic substances matter is also removed.Substituted or supplemented, usable filtering skill as the above-mentioned stage
Art, such as ultrafiltration and/or the method based on thin film technique and/or infiltration.In other words, as the supplement of biological treatment or substitution,
It can be used such as ultrafiltration membrane, ion exchange, chemical precipitation, sedimentation, flotation and/or filtering to handle effluent.
Fig. 1 shows an example of pulp mill.In general, fragment and white liquor are supplied to and are used for paper pulp cooking in pulp mill
Digester.After cooking, the paper pulp (so-called thick slurry) by cooking is transported to washing and oxygen processing stage.In general, hot
Water is used for the washing stage.It will be transported to evaporation stage from operation is cooked from the light/dark balance liquid for cooking operation, in this rank
Section removes some water from light/dark balance liquid, therefore generates aterrimus liquid.From the water of light/dark balance liquids recovery, i.e., from steaming
The condensate of hair is preferably delivered into washing stage or thick slurry.The aterrimus liquid generated in evaporation stage is handled,
To obtain green liquor.It is further processed green liquor, to obtain the white liquor that can be reused for cooking.From the washing and oxygen processing stage slightly starched
After out, paper pulp is transported to bleaching system.Bleaching system generally includes several bleaching stages for bleached pulp.Bleaching dress
It sets and usually generates acid and alkaline effluent while bleached pulp, these effluents are usually fed to wastewater treatment and set
It applies.Paper pulp by bleaching is usually fed to paper mill or pulp dryer.
Fig. 2 shows some examples of process water circulation with simplified schematic diagram.For example, these examples can be according to Fig. 1
Pulp mill in implement.
Preferably, at least partly process water is transported to treating of wood 10.Process water is preferred for round log washing.Make
To be substituted or supplemented, process water is preferred for chopping operations.As an alternative or supplement, process water is preferred for debris screen
Point.As an alternative or supplement, process water is preferred for fragment conveying.
Preferably, a part of effluent that will be delivered to treating of wood 10 includes the second clarifier filter of waste water disposal facility
Liquid out.
Preferably, at least part process water is transported to thick slurry preparation facilities 20.Preferably, process water is used for oxygen
Go wooden washing and/or diluent liquid.As an alternative or supplement, process water is preferred for drum-type displacement (DD) washer disk
Washing lotion.
The process water for being recycled to thick slurry preparation facilities 20 preferably comprises bleaching Nash pump sealing water.
Preferably, at least part process water is recycled at least one bleaching stage 30, and is preferred for set forth below
In one, two or three:
The washing lotion of-DD washer disk (drum-type displacement washing device),
The washing lotion of pressurization wash mill,
The dilution of washing stage and wherein liquid.
The process water for being recycled at least one bleaching stage 30 and washing step therein preferably comprises in set forth below
One kind, two kinds, three kinds or four kinds:
The secondary condensed water of evaporator, and/or
Causticization ejector condenser cooling water, and/or
Nash pump sealing water is bleached, and/or
Water is discharged in boiler.
Above-mentioned process water preferably bleaches Nash pump sealing water.
Preferably, at least part process water is transported to drying machine 80, and is preferably used as shower water therein.It follows
The process water of ring to drying machine 80 preferably comprises one of set forth below, two kinds, three kinds or four kinds:
The secondary condensed water of evaporator,
Water is discharged in boiler,
Nash pump sealing water is bleached, and
Causticization ejector condenser cooling water.
Above-mentioned process water preferably bleaches Nash pump sealing water.
Preferably, at least part process water is transported to waste water disposal facility 50, is preferred in this process water
The shower water of gravity table.The process water of gravity table shower water as waste water disposal facility preferably comprises following institute
One of column, two kinds, three kinds or four kinds:
The Nash pump sealing water of bleaching system 30,
Ejector condenser cooling water from causticization,
Waste water after-the second clarifier,
Evaporate secondary condensate liquid.
Preferably, at least part process water is recycled to chemical recovery plant 60, and is preferred for thin liquid slot therein
And/or white liquor condensate tank(trap).Process water for the chemical recovery 60 preferably comprises boiler discharge water.
It preferably, include one of following water source, two by least part process water recycled in chemical pulp mills
Kind, 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,
Evaporator 40, preferably comprises condensate,
Boiler 70 is recycled, boiler discharge water is preferably comprised, and
Chemical recovery preferably comprises ejector condenser cooling water and/or vacuum pump sealing water.
Preferably, at least part process water recycles in bleaching stage 30.As an alternative or supplement, it is preferable that extremely
Few a part of process water recycles within the chemical recovery stage 60.Therefore, the total amount of the effluent of generation and required raw water
Total amount decline.As an alternative or supplement, in one example, at least part process water recycles within the wastewater treatment stage.
But the latter is preferred embodiment unlike other embodiment.
Due to the circulation of at least part process water, the total amount of the effluent to purify in waste water disposal facility can be with
Decline.In addition, the total amount of required raw water (also referred to as fresh water) generally also declines.
Preferably, the water from Nash pump is used as the slurry that DD washer sieves disk at least partially；Therefore, it is produced
The amount of the total amount of raw effluent and required raw water all declines.
There may be filter devices in process water circulation.In this case, filter device is preferred for gravity separation
Platform shower water.In general, not needing any other purification devices.Therefore, if the gravity table shower water is not again sharp
Water, the then process water recycled according to the present invention are not usually required to any purifying before they are re-used as process water
Step.
The water of different purity level can also merge, so that they meet using purity level needed for position.
Table 1-3 shows some examples of reduction waste water according to the present invention." waste water [the m of realization3/ t] reduce " refer to
Following situation: in one example, the initial wastewater flow rate of pulp mill is about 22.5m3/t。
The waste water of 1. fiber process line (fiberline) of table is reduced
Waste water in 2. chemical recovery of table and original sub-block facility is reduced
Waste water in 3. treating of wood of table is reduced
It should be readily apparent to one skilled in the art that different embodiments of the invention can be applied to need the liquid to pulp mill
In the environment that stream optimizes.It is, therefore, apparent that the present invention is not limited to the above embodiments, but can be wanted in appended right
It modifies in the range of asking.
Claims (12)
1. a kind of method in chemical pulp mills processing liquid stream, the system include:
Treating of wood device (10),
Slightly starch preparation facilities (20) comprising for producing the cooking of paper pulp, washing, screening and oxygen go the wooden stage,
Bleaching system (30), for being bleached to the paper pulp of production,
Chemical recovery plant (60),
Pulp dryer (80),
It recycles boiler (70), generates boiler and water is discharged,
Evaporator (40) generates condensate,
Waste water disposal facility (50), and
Original sub-block facility,
Wherein, the method includes at least one of following water source B) to G) is delivered to position H used below) into U)
At least one, the water source B) to G) are as follows:
- B) the Nash pump sealing water from bleaching system (30),
- C) carry out the condensates of flash-pot (40),
- D) from waste water disposal facility (50) the second clarifier water,
- E) the ejector condenser cooling water from chemical recovery plant (60),
- F) the vacuum pump sealing water from chemical recovery plant (60), and
- G) the boiler discharge water from recycling boiler (70),
It is described to use position H) to U) are as follows:
- H) treating of wood device (10) round log washing,
- I) treating of wood device (10) chopping operations,
- J) treating of wood device (10) fragment screening,
- K) treating of wood device (10) fragment conveyer,
- L) slightly starch preparation facilities (20) oxygen go wooden washing,
- M) slightly starch preparation facilities (20) dilution water,
- N) bleaching system (30) drum-type displacement washing device disk,
- O) bleaching system (30) washing step,
- P) bleaching system (30) dilution water,
- Q) pulp dryer (80) drying machine shower water,
- R) waste water disposal facility (50) gravity table shower water,
- S) chemical recovery plant (60) thin liquid slot,
- T) chemical recovery plant (60) white liquor condensate tank(trap), and
- U) pulp mill's water system,
The conveying is to be connect at the water source using position with described by following pairing:
From water source D to position H,
From water source D to position I,
From water source D to position J,
From water source D to position K,
From water source B or D to position L,
From water source B or D to position M,
From water source B to position N, O, P or Q,
From water source 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, the connection is according to the one or more pairing implementations selected in above-mentioned pairing.
2. the method as described in claim 1, which is characterized in that connected at the water source using position with described by following pairing
It connects:
From water source D to position H,
From water source D to position I,
From water source D to position J,
From water source D to position K,
From water source B or D to position L,
From water source B or D to position M,
From water source B to position N, O, P or Q,
From water source B, C, D, E or F to position R, or
From water source G to position S or T.
3. method according to claim 1 or 2, which is characterized in that the Nash pump sealing water that will come from bleaching system (30) is defeated
Pulp dryer (80) are sent to, use the part water as the shower water of drying machine (from water source B to position Q).
4. the method according to any one of the preceding claims, which is characterized in that by least part from bleaching system
Nash pump sealing water is transported to the alkaline extraction stage, uses oxygen and peroxide as additional chemical reagent in this stage
(from water source B to position O or P).
5. the method according to any one of the preceding claims, which is characterized in that by least part from bleaching system
Nash pump sealing water is transported to thick slurry and prepares the screening disk of drum-type displacement washing device in (20) (from water source B to position N).
6. the method according to any one of the preceding claims, which is characterized in that the chemical recovery plant includes weak white liquor
Slot and white slurry Filter Vacuum pump, which comprises
The white slurry Filter Vacuum pump water of at least part and/or ejector condenser cooling water are transported in weak white liquor storage (from
Water source E and/or F to position S).
7. method as claimed in claim 6, which is characterized in that white slurry Filter Vacuum pump water and ejector condenser is cooling
Hydration simultaneously, and is transported in weak white liquor storage.
8. the method according to any one of the preceding claims, which is characterized in that the chemical recovery plant includes weak white liquor
Condensate tank(trap), which comprises
At least part boiler discharge water is transported in the white liquor condensate tank(trap) (from water source G to position T).
9. the method according to any one of the preceding claims, which is characterized in that the system comprises waste water disposal facilities
Dregs Filter Vacuum pump and Treatment of Sludge region, which comprises
At least part ejector condenser cooling water and/or dregs Filter Vacuum pump are transported to Treatment of Sludge region with water
Washing step (from water source E and/or F to position R).
10. the method according to any one of the preceding claims, which is characterized in that at least part of process water is being bleached
It is recycled in device.
11. the method according to any one of the preceding claims, which is characterized in that at least part of process water is in chemistry
Circulation in recyclable device (60).
12. a kind of system in chemical pulp mills processing liquid stream, the system include:
Treating of wood device (10),
Slightly starch preparation facilities (20) comprising for producing the cooking of paper pulp, washing, screening and oxygen go the wooden stage,
Bleaching system (30), for bleaching the paper pulp of production,
Chemical recovery plant (60),
It recycles boiler (70),
Evaporator (40),
Pulp dryer (80),
Waste water disposal facility (50), and
Original sub-block facility,
Wherein the system also includes B set forth below) operating position H set forth below is connected to at least one of G)) to U)
At least one of:
- B) it is suitable for conveying the equipment for the Nash pump sealing water for coming from bleaching system (30),
- C) be suitable for convey the condensate for carrying out flash-pot (40) equipment,
- D) suitable for conveying the equipment for coming from the water of the second clarifier of waste water disposal facility (50),
- E) it is suitable for conveying the equipment for the ejector condenser cooling water for coming from chemical recovery plant (60),
- F) it is suitable for conveying the equipment for the vacuum pump sealing water for coming from chemical recovery plant (60), and
- G) it is suitable for conveying the equipment of the boiler discharge water from recycling boiler (70),
The operating position H) to U) be:
- H) treating of wood device (10) round log washing,
- I) treating of wood device (10) chopping operations,
- J) treating of wood device (10) fragment screening,
- K) treating of wood device (10) fragment conveying,
- L) slightly starch preparation facilities (20) oxygen go wooden washing,
- M) slightly starch preparation facilities (20) dilution water,
- N) bleaching system (30) drum-type displacement washing device disk,
- O) bleaching system (30) washing step,
- P) bleaching system (30) dilution water,
- Q) pulp dryer (80) drying machine shower water,
- R) waste water disposal facility (50) gravity table shower water,
- S) chemical recovery plant (60) thin liquid slot,
- T) chemical recovery plant (60) white liquor condensate tank(trap), and
- U) pulp mill's water system,
The system comprises at least one of equipment set forth below connections:
- D arrives position H,
- D arrives position I,
- D arrives position J,
- D arrives position K,
- B or D to position L,
- B or D to position M,
- B arrives position N, O, P or Q,
- B, C, D, E or F to position R,
- G arrives position S or T, or
- E or F to position U,
Wherein, the connection is implemented according to one or more pairings in above-mentioned pairing.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20125265A FI129114B (en) | 2012-03-12 | 2012-03-12 | A method and a system for treating liquid flows at a chemical pulp mill |
| FI20125265 | 2012-03-12 | ||
| CN201380013968.1A CN104169492A (en) | 2012-03-12 | 2013-03-12 | Method and system for treating liquid flows at chemical pulp mill |
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| CN201380013968.1A Division CN104169492A (en) | 2012-03-12 | 2013-03-12 | Method and system for treating liquid flows at chemical pulp mill |
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| CN109811572A true CN109811572A (en) | 2019-05-28 |
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| 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 |
| 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 |
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| Country | Link |
|---|---|
| CN (3) | CN104169492A (en) |
| BR (2) | BR112014022417B1 (en) |
| FI (1) | FI129114B (en) |
| RU (2) | RU2636560C2 (en) |
| UY (1) | UY34671A (en) |
| WO (2) | WO2013135959A2 (en) |
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| 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 |
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101680168A (en) * | 2007-06-15 | 2010-03-24 | 安德里兹公司 | Method in connection with the washing of pulp at a chemical pulp mill |
| CN101680174A (en) * | 2007-06-15 | 2010-03-24 | 安德里兹公司 | Method for treating liquid flows at a chemical pulp mill |
| 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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| US5938892A (en) * | 1991-01-28 | 1999-08-17 | Champion International Corporation | Process for recycling bleach plant filtrate |
| 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 |
| CN100500991C (en) * | 2001-11-13 | 2009-06-17 | 徐守才 | Process for reclaiming and comprehensively utilizing waste digestion liquid of alkaline (or neutral) straw pulp generated by sodium sulfite method |
| RU2211836C1 (en) * | 2002-04-24 | 2003-09-10 | Кочетов Анатолий Сергеевич | Method of processing larch wood to isolate dehydroquercitine and apparatus |
| WO2004106624A1 (en) * | 2003-06-03 | 2004-12-09 | Pacific Pulp Resources Inc. | Method for producing pulp and lignin |
| WO2011119423A2 (en) * | 2010-03-23 | 2011-09-29 | International Paper Company | Improved bctmp filtrate recycling system and method |
| 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 |
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2012
- 2012-03-12 FI FI20125265A patent/FI129114B/en active IP Right Grant
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2013
- 2013-03-12 WO PCT/FI2013/050273 patent/WO2013135959A2/en active Application Filing
- 2013-03-12 CN CN201380013968.1A patent/CN104169492A/en active Pending
- 2013-03-12 BR BR112014022417-0A patent/BR112014022417B1/en active IP Right Grant
- 2013-03-12 RU RU2014136218A patent/RU2636560C2/en active
- 2013-03-12 CN CN201910294531.9A patent/CN109811572A/en active Pending
- 2013-03-12 RU RU2014136221A patent/RU2621662C2/en active
- 2013-03-12 WO PCT/FI2013/050272 patent/WO2013135958A2/en active Application Filing
- 2013-03-12 UY UY0001034671A patent/UY34671A/en active IP Right Grant
- 2013-03-12 BR BR112014022418-8A patent/BR112014022418B1/en active IP Right Grant
- 2013-03-12 CN CN201380013881.4A patent/CN104160088A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101680168A (en) * | 2007-06-15 | 2010-03-24 | 安德里兹公司 | Method in connection with the washing of pulp at a chemical pulp mill |
| CN101680174A (en) * | 2007-06-15 | 2010-03-24 | 安德里兹公司 | Method for treating liquid flows at a chemical pulp mill |
| 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 |
|---|---|
| CN104169492A (en) | 2014-11-26 |
| BR112014022417B1 (en) | 2021-06-29 |
| UY34671A (en) | 2013-10-31 |
| BR112014022418B1 (en) | 2021-09-08 |
| BR112014022417A2 (en) | 2017-06-20 |
| FI129114B (en) | 2021-07-15 |
| BR112014022418A2 (en) | 2017-06-20 |
| RU2621662C2 (en) | 2017-06-06 |
| WO2013135959A3 (en) | 2014-03-20 |
| WO2013135958A2 (en) | 2013-09-19 |
| RU2014136221A (en) | 2016-04-27 |
| WO2013135959A2 (en) | 2013-09-19 |
| RU2636560C2 (en) | 2017-11-23 |
| RU2014136218A (en) | 2016-04-27 |
| WO2013135958A3 (en) | 2013-11-14 |
| CN104160088A (en) | 2014-11-19 |
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Application publication date: 20190528 |