SE543104C2 - Screw assembly for disintegration of lignocellulosic material - Google Patents

Screw assembly for disintegration of lignocellulosic material

Info

Publication number
SE543104C2
SE543104C2 SE1950534A SE1950534A SE543104C2 SE 543104 C2 SE543104 C2 SE 543104C2 SE 1950534 A SE1950534 A SE 1950534A SE 1950534 A SE1950534 A SE 1950534A SE 543104 C2 SE543104 C2 SE 543104C2
Authority
SE
Sweden
Prior art keywords
screw
housing
screw assembly
assembly
outlet opening
Prior art date
Application number
SE1950534A
Other languages
Swedish (sv)
Other versions
SE1950534A1 (en
Inventor
Robert Wahlberg
Original Assignee
Valmet Oy
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 filed Critical Valmet Oy
Priority to SE1950534A priority Critical patent/SE1950534A1/en
Priority to PCT/SE2020/050305 priority patent/WO2020226544A1/en
Publication of SE543104C2 publication Critical patent/SE543104C2/en
Publication of SE1950534A1 publication Critical patent/SE1950534A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/18—Stationary reactors having moving elements inside
    • B01J19/20—Stationary reactors having moving elements inside in the form of helices, e.g. screw reactors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G33/00—Screw or rotary spiral conveyors
    • B65G33/24—Details
    • B65G33/26—Screws
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/36—Explosive disintegration by sudden pressure reduction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G33/00—Screw or rotary spiral conveyors
    • B65G33/08—Screw or rotary spiral conveyors for fluent solid materials
    • B65G33/14—Screw or rotary spiral conveyors for fluent solid materials comprising a screw or screws enclosed in a tubular housing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G33/00—Screw or rotary spiral conveyors
    • B65G33/08—Screw or rotary spiral conveyors for fluent solid materials
    • B65G33/14—Screw or rotary spiral conveyors for fluent solid materials comprising a screw or screws enclosed in a tubular housing
    • B65G33/18—Screw or rotary spiral conveyors for fluent solid materials comprising a screw or screws enclosed in a tubular housing with multiple screws in parallel arrangements, e.g. concentric
    • 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
    • C10L5/365—Logs
    • 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
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P2201/00—Pretreatment of cellulosic or lignocellulosic material for subsequent enzymatic treatment or hydrolysis
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P7/00—Preparation of oxygen-containing organic compounds
    • C12P7/02—Preparation of oxygen-containing organic compounds containing a hydroxy group
    • C12P7/04—Preparation of oxygen-containing organic compounds containing a hydroxy group acyclic
    • C12P7/18—Preparation of oxygen-containing organic compounds containing a hydroxy group acyclic polyhydric
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Screw Conveyors (AREA)

Abstract

The present invention relates to a screw assembly (10) comprising an elongated screw (2) for transporting lignocellulosic material, the elongated screw (2) comprising a screw core (21) and a screw blade (22) arranged on said screw core (21), and an elongated screw housing (1) comprising an end wall (17) at a first end (11), the end wall (17) having an outlet opening (13), and the screw housing (1) further comprising an inlet portion (15) with a material inlet (14), wherein the screw (2) is arranged in the screw housing (1) for transporting the lignocellulosic material from the inlet portion (15) to the outlet opening (13) at the first end (11), the housing (1) being configured to extend around a circumference of the screw (2), wherein a center (A) of the inlet portion (15) is arranged at a first distance (d1) from the first end (11), the screw blade (22) extending in said inlet portion (15) and further extending a second distance (d2) from the center (A) of the inlet portion (15) towards the first end (11), said second distance (d2) being smaller than the first distance (d1).

Description

SCREW ASSEMBLY FOR DISINTEGRATION OF LIGNOCELLULOSICMATERIAL TECHNICAL FIELD The present invention relates to a screw assembly for disintegration oflignocellulosic material comprising an elongated screw and a screw housingin which the screw is arranged for transporting lignocellulosic material fromthe inlet portion to the outlet opening at a first end. The screw housing hasan inlet portion in one area of the screw assembly and an end wall with anoutlet opening at the first end so that lignocellulosic material is transportedform the inlet portion to the outlet opening.
BACKGROUND During production of pelletized biomass fuel from a lignocellulosic material,a steam explosion process may be used to disintegrate the material beforeforming pellets. This is especially the case when producing “black pellets”,i.e. pellets made from a hardwood material. Production of black pellets isdescribed e.g. in WO2013/191897, WO2015/185751, WO2017/O89648 andEP3205707.
In a steam explosion process, a lignocellulosic material is treated in a reactorand is combined with hot steam to increase the pressure. It is thensubjected to a pressure drop that disintegrates the lignocellulosic materialby causing an explosion.
A problem associated with screw assemblies used in steam explosionprocesses is that the screw assembly must be able to feed lignocellulosicmaterial towards an outlet in an even and controlled manner and that theoutlet opening must be small in order for the steam explosion to take placeas desired. If the material is unevenly fed to the outlet or if the materialgathers to form plugs (i.e. dense portions of the slurry comprising thelignocellulosic material and a treatment liquor) the steam explosions maynot take place and the intended disintegration of material will not occur.This in turn prevents the formation of pellets from the lignocellulosicmaterial.
Prior art screw assemblies are not able to ensure the even and continuousflow of material to the outlet opening and also cannot ensure that the outletopening is prevented from being blocked by material plugs. There is thereforea need for improvements within this area.
SUMMARY The object of the present invention is to eliminate or at least to minimize theproblems discussed above. This is achieved by a screw assembly accordingto the appended independent claim.
The screw assembly according to the present invention comprises anelongated screw for transporting lignocellulosic material, the elongated screwcomprising a screw core and a screw blade arranged on said core, anelongated screw housing comprising an end wall at a first end, the end wallhaving an outlet opening for discharging disintegrated lignocellulosicmaterial from the screw assembly such that the lignocellulosic material isdisintegrated as it passes through the outlet opening, and the housingfurther comprising an inlet portion with a material inlet, wherein the screwis arranged in the housing for transporting the lignocellulosic material fromthe inlet portion to the outlet opening at the first end, the housing beingconfigured to extend around a circumference of the screw, wherein a centerof the inlet portion is arranged at a first distance from the first end, thescrew blade extending in said inlet portion and further extending a seconddistance from the center of the inlet portion towards the first end, saidsecond distance being smaller than the first distance, and wherein the screwcore is journalled at the first end and at a second end of the housing, saidsecond end being opposite the first end.
This has the advantage that there will be a space near the first end wherethe lignocellulosic material will be able to follow the flow towards the outletopening without being hindered by the screw blade. The flow is therebyrendered more even and the risk of plugging at the outlet is decreased.
The screw core is journalled at the first end and at a second end of thehousing, said second end being opposite the first end. Thereby, a stable androbust screw assembly is achieved, and since the screw core will extend allthe way to the first end it will be possible to add other components to thescrew core there that may rotate with the screw core.
The inlet portion is suitably arranged at the second end of the housing.Thereby, the entire length of the screw assembly is used for receiving andtransporting the lignocellulosic material.
An axial blade is suitably arranged on the screw in a screw portion that isbetween the first end and an end of the screw blade facing the first end, theaXial blade eXtending in a direction essentially parallel with the screw coreand at a distance from said screw core. This blade will be able to rotate withthe screw core and scrape the internal wall of the screw housing to prevent abuildup of material along the walls that could hinder the flow towards theoutlet opening.
Suitably, the screw assembly also comprises a container configured toreceive lignocellulosic material discharged from the outlet opening at acontainer pressure, wherein the screw is configured to hold lignocellulosicmaterial at a first pressure at the first end of the housing and wherein thecontainer pressure is lower than the first pressure. Thereby, the pressuredrop needed for the steam eXplosions will be created when the lignocellulosicmaterial is fed out of the outlet opening and enters the container.
A steam inlet may be included in the screw assembly for introducing steaminto the screw housing. Thereby, steam will be able to be fed into the screwassembly through the steam inlet and will improve the flow of material in thescrew assembly and also serve to improve the steam explosions taking placeafter the outlet opening. Having a steam inlet instead of supplying steam inthe material inlet will have the added benefit of creating a steam flow thatwill serve to aid the flow of material towards the outlet.
The outlet opening has a diameter that may be less than 50 % of thediameter of the end wall, preferably less than 30 % and more preferably lessthan 20 %. Thereby, steam explosions are more easily generated and thepressure inside the screw assembly is more easily maintained.
Suitably, the outlet opening is eccentrically arranged on a lower part of theend wall. Thereby, the screw core may be journalled in the center of the endwall without interfering with the outlet opening, and by providing the outletopening on the lower part of the end wall the material will more easily be fedthrough the outlet opening.
A scraper may suitably be arranged on the screw core at the first end, thescraper being configured to rotate with the screw core and to scrape theoutlet opening on the end wall. Thereby, the outlet opening will be kept cleanand plugging of material will be prevented. By arranging the scraper on thescrew core a suitable rotation will be achieved without requiring additionalcomponents in the screw assembly.
The screw blade may suitably be a ribbon flight. Also, the screw blade mayeXtend throughout the inlet portion, so that material fed into any part of theinlet portion will be transported by the screw in an efficient way.
Many additional benefits and advantages of the present invention will bereadily understood by the skilled person in view of the detailed descriptionbelow.
DRAWINGS The invention will now be described in more detail with reference to theappended drawings, wherein: Fig. 1 discloses a planar view of the screw assembly according to apreferred embodiment of the present invention, the screwassembly being shown from the side without an external wall ofthe housing in order to clearly show the screw inside the housing; Fig. 2 discloses a planar view of the screw assembly from the side; Fig. 3 discloses a cross-sectional view of the screw assembly accordingto a second embodiment of the invention; and Fig. 4 discloses a planar view of the screw assembly from the side with a container for receiving material from the screw assembly.DETAILED DESCRIPTION The present invention is used within the field of pulping when a pulp isproduced from a raw material in the form of a lignocellulosic material. Theterm lignocellulosic material is used herein to mean materials containinglignin, cellulose and hemicellulose. One example of such materials is wood,others include other agricultural or forestry wastes. The lignocellulosicmaterial is commonly divided into small pieces, chips or fragments beforethe pulping process is initiated.
Figs. 1-2 disclose a preferred embodiment of a screw assembly 10 having anelongated screw housing 1 that extends around an elongated screw 2configured to transport lignocellulosic material in a direction towards a firstend 11 of the screw housing 1. The screw 2 comprises a screw core 21 thatis journalled at the first end 11 and at an opposing second end 12 of thescrew housing 1 so that the screw core 21 is able to rotate. A screw blade 22is mounted on the screw core 21 and serves to rotate with the screw core 21for transporting material towards the first end 11, i.e. to the left in Fig. 1-2.A marker A shows a center of the inlet portion 15 having a material inlet 14into which lignocellulosic material is introduced, preferably by a secondscrew assembly that feeds lignocellulosic material at high pressure into thescrew assembly 10 according to the present invention. Steam is also addedand is transported together with the lignocellulosic material towards the firstend 11, either by introduction into the material inlet 14 or by introductioninto a steam inlet 16 that is shown in Fig. 2 in the vicinity of the materialinlet 14 but that may be located at any suitable part of the screw housing 1.The screw housing 1 preferably fits around the screw so that an inner shapeof the screw housing 1 matches an outer shape of the screw 2.
The screw blade 22 may suitably be a ribbon flight. This is a highly suitableand efficient type of screw blade that allows for a continuous and evenfeeding of material towards the outlet opening 13.
A distance the center A of the inlet portion 15 to an end Wall 17 at the firstend 11 is a first distance dl and this is the distance that any material fedinto the inlet portion 15 will travel to reach the first end 11. The screw blade22 of the screw 2 extends a second distance d2 from the center A of the inletportion in a direction towards the first end 11. The first distance d1 is largerthan the second distance d2 so that a space 18 is formed inside the screwhousing 1 where lignocellulosic material can flow without being contacted bya screw blade 22 of the screw 2. In the space 18 lignocellulosic material andsteam are transported by being pushed by lignocellulosic material that iscloser to the material inlet 14. In the end wall 17 at the first end 11, anoutlet opening 13 is provided to feed lignocellulosic material from the screwassembly 10 out into an adjacent container 3 (see Fig. 4). The lignocellulosicmaterial in the screw assembly 10 is held at a first pressure and an inside ofthe container 3 is held at a second pressure that is significantly lower thanthe first pressure. The pressure difference may be upheld by the outletopening 13 being small, preferably having a diameter that less than 50 % ofa diameter of the end wall 17, preferably less than 30 % and more preferablyless than 20 %. For an end wall having a diameter of about 500 mm, theoutlet opening may in the preferred embodiment have a diameter of about 80mm. Thus, the pressure inside the screw assembly 10 is maintained, and forthe material being discharged through the outlet opening 13 the pressuredrop will result in a steam explosion that disintegrates the material intosmaller pieces.
The first pressure is achieved by the lignocellulosic material being fed intothe screw assembly 10 at a high pressure, by the addition of pressurizedsteam to the screw assembly 10 and by the screw blade 22 being configuredto transport the lignocellulosic material towards the outlet opening 13.
The screw blade 22 suitably extends throughout the inlet portion 15 so thatmaterial fed into any part of the material inlet 14 is received by the screwand fed towards the first end 11. In some embodiments, the screw blade 22further extends all the way to the second end 12 of the housing 1. Thisprevents material from flowing towards the second end 12 and being stuckthere, since any material fed into the screw at the inlet portion 15 will besubjected to the rotating screw blade 22 and transported towards the firstend 11.
A scraper 23 may advantageously be mounted on the screw core 21 to rotatewith the screw 2 and scrape the end wall 17 or at least a portion of the endwall 17 where the outlet opening 13 is located. This enables a continuouscleaning of the outlet opening 13 to prevent it from being blocked by thelignocellulosic material and ensures a smooth operation of the discharge ofmaterial from the screw assembly 10.
The housing 1 is dimensioned to fit around the screw 2 and in the preferredembodiment has an essentially cylindrical inner space in which the screw 2is arranged. The screw 2 in turn is configured to transport lignocellulosicmaterial from the material inlet 14 in the inlet portion 15 to the outletopening 13 where the material is discharged from the screw assembly 10.The inlet portion 15 is arranged at the second end 12 of the housing 1.
Fig. 4 shows the screw assembly 10 of Fig. 2 with the container 3 connectedthereto. The container 3 is arranged to receive the lignocellulosic materialthat is discharged through the outlet opening 13 and to hold the material atthe second pressure as described above. The lignocellulosic material may betransported from the container 3 to further process steps such as theformation of pellets.
Fig. 3 discloses a second embodiment of the invention that differs from thepreferred embodiment described above mainly in the presence of an axialblade 24 that is arranged on the screw 2 and eXtends in an axial direction ata distance from the screw core 21. In the second embodiment, the axialblade 24 is arranged in a direction essentially parallel with the screw core 21at an outer circumference of the screw 2 and joins an end of the screw blade22 at the second distance d2 from the inlet portion 15 with the scraper 23 atthe first end 11, i.e. at the first distance d1 from the inlet portion 15. Theaxial blade 24 serves to rotate with the screw core 21 and to scrape an innerwall of the housing 1 in the space 18 between the end of the screw blade 22and the first end 11 to prevent material from adhering to the wall of thehousing 1.
The outlet opening 13 may in both embodiments described above bearranged eccentrically on the end wall 17 and is advantageously located on alower part of the end wall 17. This has the benefits that the screw core 21can be journalled on a center of the end wall 17 without disturbing theoutlet opening 13 and that the lignocellulosic material will be aided bygravity in reaching the outlet opening 13.
In some embodiments, the screw assembly 10 may serve as a reactor fortreating the lignocellulosic material. In such embodiments, a treatmentliquor is added and the dimensions of the screw assembly 10 as well as arotary speed of the screw 2 are adapted to ensure that the lignocellulosicmaterial is held inside the screw assembly 10 for a suitable treatment timebefore being discharged though the outlet opening 13. In such embodiments,steam may also be added to control the pressure inside the screw assembly10. The treatment liquor may itself be steam.
It is to be noted that features from the various embodiments describedherein may freely be combined, unless it is explicitly stated that such acombination Would be unsuitable.

Claims (4)

1. Screw assembly (10) for disintegration of lignocellulosic materialin a steam explosion process, the screw assembly (10)comprising - an elongated screw (2) for transporting lignocellulosicmaterial, the elongated screw (2) comprising a screw core(21) and a screw blade (22) arranged on said core, - an elongated screw housing (1) comprising an end wall(17) at a first end (11), the end wall (17) having an outletopening for discharging disintegrated lignocellulosicmaterial (13) from the screw assembly (10) such that thelignocellulosic material is disintegrated as it passesthrough the outlet opening, and the housing (1) furthercomprising an inlet portion (15) with a material inlet (14),wherein the screw (2) is arranged in the housing (1) fortransporting the lignocellulosic material from the inletportion (15) to the outlet opening (13) at the first end (11),the housing (1) being configured to extend around acircumference of the screw (2), wherein a center (A) of the inlet portion (15) is arranged at a firstdistance (d1) from the first end, the screw blade (22) extendingin said inlet portion (15) and further extending a seconddistance (d2) from the center (A) of the inlet portion (15) towardsthe first end (11), said second distance (d2) being smaller thanthe first distance (d1), which screw assembly is characterizedin that the screw core (21) is journalled at the first end (11) andat a second end (12) of the housing (1), said second end (12)being opposite the first end (1 1).
2. Screw assembly (10) according to claim 1, wherein the inletportion (15) is arranged at the second end of the housing (1).
3. Screw assembly (10) according to any previous claim, furthercomprising a scraper (23) arranged on the screw core (21) at thefirst end (11), the scraper (23) being configured to rotate withthe screw core (21) and to scrape the outlet opening (13) on theend wall (17).
4. Screw assembly (10) according to any previous claim, furthercomprising an axial blade (24) arranged on the screw (2) in ascrew portion that is between the first end (11) and an end ofthe screw blade (22) facing the first end (11), the axial blade (24) 10. eXtending in a direction essentially parallel with the screw core(21) and at a distance from said screw core (21). Screw assembly (10) according to any previous claim, furthercomprising a container (3) configured to receive lignocellulosicmaterial discharged from the outlet opening (13), wherein thescrew assembly (10) is configured to hold lignocellulosicmaterial at a first pressure at the first end (11) of the housing(1) and the container (3) holds lignocellulosic material at asecond pressure, and wherein the second pressure is lower thanthe first pressure. Screw assembly (10) according to any previous claim, furthercomprising a steam inlet (16) for introducing steam into thescrew housing (1). Screw assembly (10) according to any previous claim, whereinthe outlet opening (13) has a diameter that is less than 50 % ofthe diameter of the end wall (17), preferably less than 30 % andmore preferably less than 20 %. Screw assembly (10) according to any previous claim, whereinthe outlet opening (13) is eccentrically arranged on a lower partof the end wall (17). Screw assembly (10) according to any previous claim, whereinthe screw blade (22) is a ribbon flight. Screw assembly (10) according to any previous claim, whereinthe screw blade (22) extends throughout said inlet portion (15).
SE1950534A 2019-05-06 2019-05-06 Screw assembly for disintegration of lignocellulosic material SE1950534A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SE1950534A SE1950534A1 (en) 2019-05-06 2019-05-06 Screw assembly for disintegration of lignocellulosic material
PCT/SE2020/050305 WO2020226544A1 (en) 2019-05-06 2020-03-24 Screw assembly for disintegration of lignocellulosic material in a steam explosion process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1950534A SE1950534A1 (en) 2019-05-06 2019-05-06 Screw assembly for disintegration of lignocellulosic material

Publications (2)

Publication Number Publication Date
SE543104C2 true SE543104C2 (en) 2020-10-06
SE1950534A1 SE1950534A1 (en) 2020-10-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
SE1950534A SE1950534A1 (en) 2019-05-06 2019-05-06 Screw assembly for disintegration of lignocellulosic material

Country Status (2)

Country Link
SE (1) SE1950534A1 (en)
WO (1) WO2020226544A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE419875B (en) * 1978-02-10 1981-08-31 Mo Och Domsjoe Ab PROCEDURAL DEVICE FOR ROTATING, WITH RIVOR ORGANIZED ANTI-DRAWING DEVICE SPECIFIC FIBROST CELLULOSAMATEIAL
CN101463570B (en) * 2009-01-12 2012-01-04 广州华新科实业有限公司 Screw rod injection type plant fibre steam blasting device and method
JP5250665B2 (en) * 2011-06-27 2013-07-31 株式会社神鋼環境ソリューション Method for wet methane fermentation of organic waste
FI126555B (en) * 2015-11-26 2017-02-15 Valmet Technologies Oy Biomass-based fuel arranged to reduce the chemical and / or mechanical influence of the flue gas on heat transfer surfaces and the method for its production

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WO2020226544A1 (en) 2020-11-12
SE1950534A1 (en) 2020-10-06

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