EP4127110A1 - Procédé d'utilisation des boues provenant de la fabrication de la pâte de bois - Google Patents

Procédé d'utilisation des boues provenant de la fabrication de la pâte de bois

Info

Publication number
EP4127110A1
EP4127110A1 EP21775698.0A EP21775698A EP4127110A1 EP 4127110 A1 EP4127110 A1 EP 4127110A1 EP 21775698 A EP21775698 A EP 21775698A EP 4127110 A1 EP4127110 A1 EP 4127110A1
Authority
EP
European Patent Office
Prior art keywords
sludge
surplus
biomass
effluent
lignocellulose containing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21775698.0A
Other languages
German (de)
English (en)
Other versions
EP4127110A4 (fr
Inventor
Tero Joronen
Peter BJÖRKLUND
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Technologies Oy
Valmet AB
Original Assignee
Valmet Oy
Valmet AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valmet Oy, Valmet AB filed Critical Valmet Oy
Publication of EP4127110A1 publication Critical patent/EP4127110A1/fr
Publication of EP4127110A4 publication Critical patent/EP4127110A4/fr
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L5/00—Solid fuels
    • C10L5/40—Solid fuels essentially based on materials of non-mineral origin
    • C10L5/44—Solid fuels essentially based on materials of non-mineral origin on vegetable substances
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L5/00—Solid fuels
    • C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
    • C10L5/06—Methods of shaping, e.g. pelletizing or briquetting
    • C10L5/10—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders
    • C10L5/14—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders with organic binders
    • C10L5/20—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders with organic binders with sulfite lye
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L5/00—Solid fuels
    • C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
    • C10L5/34—Other details of the shaped fuels, e.g. briquettes
    • C10L5/36—Shape
    • C10L5/361—Briquettes
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L5/00—Solid fuels
    • C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
    • C10L5/34—Other details of the shaped fuels, e.g. briquettes
    • C10L5/36—Shape
    • C10L5/363—Pellets or granulates
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L5/00—Solid fuels
    • C10L5/40—Solid fuels essentially based on materials of non-mineral origin
    • C10L5/48—Solid fuels essentially based on materials of non-mineral origin on industrial residues and waste materials
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L9/00—Treating solid fuels to improve their combustion
    • C10L9/08—Treating solid fuels to improve their combustion by heat treatments, e.g. calcining
    • 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
    • D21C11/0007—Recovery of by-products, i.e. compounds other than those necessary for pulping, for multiple uses or not otherwise provided for
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
    • C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/06—Pressure conditions
    • C02F2301/066—Overpressure, high pressure
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/06—Sludge reduction, e.g. by lysis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/26—Reducing the size of particles, liquid droplets or bubbles, e.g. by crushing, grinding, spraying, creation of microbubbles or nanobubbles
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/08—Drying or removing water
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/24—Mixing, stirring of fuel components
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/28—Cutting, disintegrating, shredding or grinding
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/30—Pressing, compressing or compacting
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/48—Expanders, e.g. throttles or flash tanks
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/50—Screws or pistons for moving along solids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L5/00—Solid fuels
    • C10L5/40—Solid fuels essentially based on materials of non-mineral origin
    • C10L5/44—Solid fuels essentially based on materials of non-mineral origin on vegetable substances
    • C10L5/442—Wood or forestry waste
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/10—Biofuels, e.g. bio-diesel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel

Definitions

  • tree material refers to raw material such as whole tree logs
  • wood material refers to the cellulose containing material suitable for Kraft pulping remaining after removal of bark and optionally other surplus biomass material from the tree material.
  • the whole tree logs may comprise one single wood species or a combination of several wood species.
  • Chemical pulping mills in general and notably Kraft mills are well known for the person skilled in the art and will not be described in further detail herein.
  • the step of reducing water content further comprises, prior to the thermal drying, pressure heating/thermal treatment of the sludge at elevated pressure and temperature followed by steam explosion discharge.
  • the steam exploded sludge may thereafter be mechanically dewatered.
  • pressure heating and steam explosion destroys the sludge structure such that more water can be separated from the sludge mechanically by pressing and filtering.
  • the dry solids content of the pressed sludge then increases.
  • the improved mechanical dewatering has a washing effect such that water-soluble unwanted salts are better separated from the sludge. For example, the concentrations of potassium, sodium and chlorine which may cause fouling and corrosion in a steam boiler, are reduced.
  • the method further comprises thermal drying of the surplus biomass prior to the reducing of the particle size.
  • the drying may be carried out using for example a low temperature belt dryer using surplus low-grade heat from the pulp mill.
  • the dewatering apparatus may comprise a pressure heating device configured to continuously treat the sludge at elevated pressure and temperature.
  • the pressurized vessel of the pressure heating device comprises an adjustable blow valve or a constant diameter discharge orifice to achieve a steam explosion discharge of sludge.
  • the steam exploded sludge is thereafter fed to the mechanical dewatering apparatus.
  • the system further comprises a pressure heating device configured to continuously treat the surplus biomass at elevated pressure and temperature.
  • the pressurized vessel of the pressure heating device comprises an adjustable blow valve or a constant diameter discharge orifice to achieve a steam explosion discharge of biomass.
  • Primary sludge is obtained from the primary treatment unit which involves sedimentation (settling) of the effluent.
  • the settled primary sludge mostly contains wood fibres.
  • Secondary sludge is obtained from the secondary treatment unit which comprises aerated lagoon(s) or an anaerobic digester where organic material is decomposed by biological processes. The residual organic material settles, and it is recovered as secondary sludge sometimes also called “bio sludge”.
  • Secondary sludge contains more inorganic material than primary sludge, flocculants (see below) may be added to improve sludge settling in secondary treatment.
  • At least tertiary sludge, enriched in flocculants added, is fed for dewatering with a thermal dryer 4 for example a low temperature belt dryer configured to reduce the water content to obtain dried (tertiary) sludge.
  • a thermal dryer 4 for example a low temperature belt dryer configured to reduce the water content to obtain dried (tertiary) sludge.
  • the primary and/or secondary sludges (dotted lines in the figure) is/are fed to the thermal dryer 4.
  • the dryer 4 is heated with low-pressure steam which preferably is low-grade steam from the chemical recovery island of the Kraft mill.
  • a thermal dryer 9 Surplus biomass separated from the wood material in separating device 1 is fed to a thermal dryer 9, for example a low temperature belt dryer configured to reduce the water content of the surplus biomass.
  • the dryer 9 is provided with air and low-pressure steam, which low pressure steam is preferably steam from the recovery island of the Kraft pulp mill.
  • At least a portion of the dewatered and dried sludge is mixed with at least a portion of the surplus lignocellulose biomass using mixing means 5 illustrated schematically as a mixer to obtain a biomass and sludge mixture.
  • the sludge is fed to the thermal dryer 14, being of the same type described above with reference to Figure 1.
  • the pressure heating 17 and/or the screw press 18 is/are omitted, and the sludge is fed directly from the wastewater treatment plant to the dryer 14 or to the screw press 18.
  • the dried surplus biomass is fed to a pressure heating device 111 being a pressurized vessel driven to provide continuous thermal treatment of the surplus biomass at elevated pressure and temperature.
  • the pressure heating device is heated by medium pressure steam from the recovery island of the Kraft pulp mill (not shown).
  • the thermally treated biomass is discharged through an adjustable blow valve or a constant diameter discharge orifice to achieve a steam explosion discharge of the biomass.
  • the pressure heating/thermal treatment is performed at a pressure of 15-25 bars, and at a temperature of 150-240 °C for less than 15 minutes.
  • At least a portion of the sludge from the thermal dryer 14 is mixed with at least a portion of the thermally treated surplus lignocellulose biomass with a mixer, illustrated schematically as 15 in Figure 2, to obtain a biomass and sludge mixture.
  • a mixer illustrated schematically as 15 in Figure 2
  • at least a portion of the sludge is mixed with the surplus biomass prior to being fed to the pressure heating device 111 using mixer 15’ and/or is mixed with the biomass during the pressure heating/thermal treatment in the pressure heating device 111 by being injected therein using mixing means in the form of an injector 15”.
  • the pressure heating device 111 is omitted.
  • a size reduction device 110 in the form of a hammermill is arranged between the thermal dryer 19 and the pressure heating device 111.
  • the optional size reduction device 110 is arranged between the thermal dryer 19 and the pressing apparatus 16.
  • separated lignin is added to the bark/surplus biomass as a binder in the same way as described in SE541263.
  • mixing of dried sludge to surplus biomass is advantageously accomplished in the pressing apparatus (pelletizing or briquetting plant) 6/16 which may be furnished with a small container and a dosing screw which adds the dry sludge to surplus biomass before the pelleting (or briquetting) presses.
  • FIG. 3 shows a flowchart illustrating an embodiment of a method according to the first aspect of the invention.
  • the method comprises separating 21 the tree material into wood material and surplus lignocellulose containing biomass, processing 22 the wood material according to the Kraft pulping process to produce pulp, withdrawing 23 at least one effluent from the Kraft pulping process to a waste water treatment plant, treating 24 the at least one effluent with a flocculant comprising at least one aluminum and/or iron settling chemical to obtain at least one sludge, reducing 25 the water content of the at least one sludge to obtain dewatered sludge, optionally drying 26 the surplus biomass, optionally reducing 27 the particle size of the dried surplus biomass (for instance using a hammermill), optionally thermally treating/pressure heating 28 of the biomass, adding 29 at least a portion of the dewatered sludge to the pressure/thermal treated biomass and finally densifying 210 the biomass and sludge mixture to form pellets or briquettes.
  • the step of reducing 25 water content comprises thermal drying of the sludge and optionally mechanically dewatering the sludge prior to said thermal drying.
  • the step of reducing 25 water content may optionally further comprise, prior to the thermal drying, pressure heating/thermal treatment of the sludge at elevated pressure and temperature followed by steam explosion discharge.
  • the adding 29 may additionally or alternatively be performed before or simultaneously with the pressure heating 28.
  • the description above and the appended drawings are to be considered as non-limiting examples of the invention. The person skilled in the art realizes that several changes and modifications may be made within the scope of the invention. For example, although a single effluent from the Kraft pulping line is shown in the embodiments above, it is understood that two or more effluents may be withdrawn in other embodiments. Furthermore, the sludge(s) and surplus biomass may be dried, dewatered and/or thermally treated using other equivalent devices/techniques known to the person skilled in the art. The scope of protection is determined by the appended patent claims.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Mechanical Engineering (AREA)
  • Geology (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • Inorganic Chemistry (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

Abstract

L'invention concerne un procédé de production de pastilles ou de briquettes de combustible à partir de lignocellulose excédentaire contenant une biomasse de matières provenant des arbres, utilisées dans un procédé de fabrication de pâtes Kraft. Le procédé comprend la séparation (21) du matériau provenant des arbres en matériau de bois et en une biomasse excédentaire contenant de la lignocellulose, le traitement (22) du matériau de bois dans le procédé de fabrication de pâtes Kraft pour obtenir de la pâte, l'élimination (23) d'au moins un effluent du procédé de fabrication de pâtes Kraft vers l'installation de traitement des eaux usées, le traitement (24) de l'au moins un effluent pour obtenir au moins une boue, la réduction (25) de la teneur en eau de ladite au moins une boue pour obtenir de la boue déshydratée, l'addition (29) d'au moins une partie de la boue déshydratée à au moins une partie de la biomasse excédentaire contenant de la lignocellulose, pour obtenir un mélange de biomasse et de boue, et la densification (210) du mélange pour former des pastilles ou des briquettes de combustible.
EP21775698.0A 2020-03-25 2021-02-08 Procédé d'utilisation des boues provenant de la fabrication de la pâte de bois Pending EP4127110A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE2050328A SE543633C2 (en) 2020-03-25 2020-03-25 Method for utilizing sludges from wood pulping
PCT/SE2021/050092 WO2021194403A1 (fr) 2020-03-25 2021-02-08 Procédé d'utilisation des boues provenant de la fabrication de la pâte de bois

Publications (2)

Publication Number Publication Date
EP4127110A1 true EP4127110A1 (fr) 2023-02-08
EP4127110A4 EP4127110A4 (fr) 2024-04-17

Family

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EP21775698.0A Pending EP4127110A4 (fr) 2020-03-25 2021-02-08 Procédé d'utilisation des boues provenant de la fabrication de la pâte de bois

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FI953157A (fi) * 1995-06-26 1996-12-27 Esko Torkkeli Ympäristölietteen käsittelymenetelmä
JP2003138283A (ja) * 2001-11-01 2003-05-14 Nippon Paper Industries Co Ltd 用水処理汚泥を原料とする固形燃料
SE527884C2 (sv) * 2004-05-10 2006-07-04 Arne Lindahl Förfarande för vätskeutdrivning från suspensioner
FI126502B (en) * 2014-06-30 2017-01-13 Upm Kymmene Corp Procedure for the treatment of bio-sludge
SE541263C2 (en) * 2017-09-18 2019-05-28 Valmet Oy Method and system for production of fuel pellets or briquettes

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SE2050328A1 (en) 2021-04-27
EP4127110A4 (fr) 2024-04-17
SE543633C2 (en) 2021-04-27

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