SE2330057A1 - Discharge screw arrangement for discharging biomass - Google Patents

Discharge screw arrangement for discharging biomass

Info

Publication number
SE2330057A1
SE2330057A1 SE2330057A SE2330057A SE2330057A1 SE 2330057 A1 SE2330057 A1 SE 2330057A1 SE 2330057 A SE2330057 A SE 2330057A SE 2330057 A SE2330057 A SE 2330057A SE 2330057 A1 SE2330057 A1 SE 2330057A1
Authority
SE
Sweden
Prior art keywords
discharge screw
cleaning device
discharge
outlet
biomass material
Prior art date
Application number
SE2330057A
Inventor
Örjan Ahlgren
Patrik Pettersson
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 SE2330057A priority Critical patent/SE2330057A1/en
Publication of SE2330057A1 publication Critical patent/SE2330057A1/en

Links

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
    • D21C7/00—Digesters
    • D21C7/08—Discharge devices
    • 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
    • B65G33/24—Details
    • 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
    • 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
    • B65G65/00—Loading or unloading
    • B65G65/30—Methods or devices for filling or emptying bunkers, hoppers, tanks, or like containers, of interest apart from their use in particular chemical or physical processes or their application in particular machines, e.g. not covered by a single other subclass
    • B65G65/34—Emptying devices
    • B65G65/40—Devices for emptying otherwise than from the top
    • B65G65/46—Devices for emptying otherwise than from the top using screw conveyors
    • 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
    • D21C7/00—Digesters
    • 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
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D21C1/02—Pretreatment of the finely-divided materials before digesting with water or steam

Abstract

Discharge screw arrangement for discharging biomass material, the discharge screw arrangement comprising a discharge chamber (21) provided with an inlet for receiving biomass material from a biomass treatment reactor, and an outlet (24) for discharging the biomass material, a discharge screw (25) rotatably arranged in the discharge chamber (21), the discharge screw being configured to mechanically transport the biomass material from the inlet through the discharge chamber in a flow direction along a rotational axis (25a) of the discharge screw and out through the outlet, the outlet being disposed at a downstream end of the discharge chamber, and a cleaning device (26) rotatably arranged in the discharge chamber (21) to rotate in a direction of rotation. The outlet (24) is disposed in an end wall portion (21a) of the discharge chamber at the downstream end thereof, the end wall portion being disposed at an angle relative said rotational axis. The cleaning device (26) is arranged adjacent the end wall portion, the cleaning device being configured to displace the biomass material in a direction being opposite the flow direction and/or in the direction of rotation.

Description

TECHNICAL FIELD The invention relates to the field of treatment of biomass material such as lignocellulosic material, and more specifically to discharge screw arrangements for discharging biomass from a biomass treatment reactor through an outlet, which outlet may be arranged for steam explosion discharge.
BACKGROUND Processes for treatment of biomass such as pre-treatment or more specifically pre-hydrolysis of biomass material such as lignocellulosic biomass material are known in the art. Pre-hydrolysis, which may also be referred to as hydrothermal treatment, is carried out at milder conditions compared to a hydrolysis process and is used for hydrolyzing the hemicellulose content of the biomass. The pre-hydrolysis process may be performed with added acid catalyst or without added catalyst (so-called autohydrolysis). The pre-hydrolysis process is used for example as a pretreatment stage in the pre-hydrolysis Kraft process (PHK), in processes for producing pellets, and in processes for producing ethanol as a pretreatment stage preceding a hydrolysis stage for hydrolyzing cellulose to sugar for subsequent fermentation to ethanol.
The pre-hydrolysis/hydrothermal treatment is performed at elevated pressure and temperature by adding the biomass to a pressurized reactor into which steam is added for heating the biomass to saturation temperature by direct condensation. The pressure level of the reactor which may be designed for continuous operation is in the range 5-30 bar and the retention time is in the range 1-20 minutes. The reactor may be horizontally or vertically arranged. In a typical horizontal reactor, an internal conveyor screw transports the biomass material through the reactor. The retention time can be controlled using the rotational speed of the screw. In a vertical reactor, a conveyor screw is typically arranged at a lower portion of the reactor for feeding the biomass material out from the reactor. In horizontal as well as vertical reactors, steam is added at one or more positions.
After treatment in the reactor, the lignocellulosic material is discharged from the reactor for further transport to subsequent processing equipment. Advantageously, the treated biomass is discharged (blown) from the reactor through a blow pipe/valve, so called steam explosion discharge. Steam explosion refers to a process step where the material undergoes a rapid/instantaneous pressure decrease. Thus, the hot and softened biomass from the thermal treatment is released or blown from the reactor through a blow valve or orifice, while the pressure drops to an environment with substantially lower pressure, such as below 5 bar, or preferably to substantially atmospheric pressure.
Discharging of the biomass from the reactor may be carried out using a discharge screw arrangement comprising a discharge chamber provided with an inlet for receiving biomass material from the biomass treatment reactor, and an outlet for discharging the biomass material.
A discharge screw is rotatably arranged in the discharge chamber; the discharge screw being configured to convey the biomass material from the inlet through the discharge chamber to the outlet at the downstream end of the discharge chamber. The outlet may be connected to a blow pipe and / or blow valve/orifice for steam explosion discharge. The outlet may be directed peripherally/radially or axially/ in the flow direction.
Although reference has been made above specifically to the pre-hydrolysis process, it is noted that the present invention relates to discharging of biomass material from a reactor regardless of the process carried out therein.
SUMMARY An object of the invention is to provide a discharge screw arrangement and a biomass treatment arrangement comprising such a discharge screw arrangement which provides improved discharge performance.
These and other objects are achieved by the present invention by means of a discharge screw arrangement and a biomass treatment arrangement according to the independent claims.
According to a first aspect of the invention, there is provided a discharge screw arrangement for discharging biomass material (such as lignocellulosic material) from a biomass treatment reactor. The discharge screw arrangement comprises a discharge chamber provided with an inlet for receiving biomass material from the biomass treatment reactor, and an outlet for discharging the biomass material. A discharge screw is rotatably arranged in the discharge chamber, the discharge screw being configured to mechanically transport the biomass material from the inlet through the discharge chamber in a flow direction substantially along a rotational axis of the discharge screw and out through the outlet, the outlet being disposed at a downstream end of the discharge chamber. The outlet is disposed in/ through an end wall portion of the discharge chamber at the downstream end thereof, wherein the end wall portion may be disposed at an angle relative said rotational axis. A cleaning device may be rotatably arranged in the discharge chamber adjacent the end wall portion. The cleaning device may be configured to transport the biomass material in a direction being opposite the flow direction and/or in a direction of rotation of the cleaning device, i.e. in a direction having components in a direction being opposite the flow direction and/or in a direction of rotation ofthe cleaning device. The cleaning device may be described as arranged to sweep or clean biomass material off the end wall portion.
The discharge chamber may be described as elongated, i.e. having a substantially greater length (in a longitudinal direction being parallel with the rotational axis) than width or diameter. The discharge chamber may be substantially cylindrically formed, and/ or may be described as pipe shaped. The discharge chamber may be substantially horizontally arranged, i.e. with its longitudinal direction and / or the rotational axis in a substantially horizontal plane. The inlet may be arranged at a first longitudinal end (an upstream end as seen in the flow direction) of the discharge chamber and / or at an upper portion thereof. In embodiments where the biomass treatment reactor is substantially horizontally arranged, that the biomass material may fall into the inlet into the discharge chamber by means of gravity. The outlet may be disposed in an end wall portion of the discharge chamber at the downstream end thereof in the sense that the outlet is formed as an opening or orifice in/through the end wall portion. The end wall portion (or the end wall in its entirety) may be disposed at an angle relative the flow direction or rotational axis, for example perpendicularly relative the rotational axis, which may also be described as parallel with the plane of rotation of the discharge screw and/ or parallel with the plane of rotation of the cleaning device. The end wall portion may be a portion of a plane, curved or otherwise shaped end wall of the discharge chamber. The outlet may alternatively be described as directed, i.e. having its flow direction, at an acute angle relative the rotational axis/flow direction, for example in parallel with the rotational axis/flow direction. In other words, the outlet is non- radially directed. The cleaning device may be arranged adjacent the end wall portion to sweep, clean or scrape biomass material off the end wall portion, for example by means ofbeing configured to displace/transport the biomass material in a direction being opposite the flow direction and / or in the direction of rotation of the cleaning device (which may also be described as a tangential direction) such as to achieve the sweeping, cleaning or scraping of the end wall portion. Alternatively, the cleaning device may be described as configured to stir the biomass material located at/ adjacent the end wall portion by means of displacing/transporting the biomass material in a direction being opposite the flow direction and/or in the direction of rotation of the cleaning device.
The invention is based on the insight that an outlet directed in the flow direction, for example in an end wall portion arranged at an angle (perpendicularly for example) relative the flow direction is advantageous since a well-defined flow area can be achieved but is disadvantageous since biomass material tends to accumulate at the end wall causing plugging of the outlet and may prevent the discharge screw from rotating freely (without excessive force). The invention is furthermore based on the insight that by providing the discharge device with a cleaning device which cleans or sweeps biomass material off the end wall portion, accumulation of biomass material at the end wall can be reduced or prevented.
In embodiments, the discharge screw arrangement further comprises a steam explosion device connected to the outlet. Steam explosion discharge devices are known in the art and are configured to discharge/blow the material while rapidly decreasing the pressure, for instance to ambient pressure. The steam explosion discharge device may comprise a blow pipe and/or a blow valve and / or a blow orifice.
In embodiments, the cleaning device is rotatably arranged around a rotational axis being concentric with the rotational axis of the discharge screw, i.e. rotating around a common rotational axis. For example, the cleaning device may be arranged axially adjacent (after as seen in the flow direction) the discharge screw.
In embodiments, the cleaning device is arranged to rotate with the discharge screw. The cleaning device may be formed integrally with the discharge screw to rotate therewith. Alternatively, the cleaning device may be a separate part arranged axially adjacent (after as seen in the flow direction) the discharge screw and connected to the discharge screw to rotate therewith. Such embodiments are advantageous since they do not require a separate motor or the like for rotation of the cleaning device.
In embodiments, the cleaning device comprises at least one blade extending in a substantially radial direction relative the rotational axis of the cleaning device. The term blade is to be interpreted in analogy with a propeller blade, i.e. a substantially radially extending arm comprising a plane or curved surface which acts on the biomass material.
One or more of the at least one radially extending blade may comprise at least one surface portion acting on the biomass material, i.e. facing in the direction of rotation ofthe cleaning device. At least one of the surface portion(s) may be disposed substantially perpendicularly relative a plane of rotation of the cleaning device. Alternatively, or additionally, at least one of the surface portion(s) may be disposed at an acute angle relative a plane of rotation of the cleaning device. At least one, or each, of the surface portion(s) may be substantially plane.
Alternatively, or additionally, one or more of the at least one radially extending blade comprises at least one surface portion being curved in a direction of rotation of the cleaning device such as to transport the material radially inwardly. It is understood that plane of rotation refers to the plane being perpendicular to the rotational axis of the cleaning device, i.e. the plane having the rotational axis as a normal. Combinations of the above-described embodiments are foreseeable, for example one and the same blade may be provided with one surface portion disposed substantially perpendicularly and an additional surface portion disposed at an acute angle. Further, a cleaning device may be provided with one blade having a surface portion disposed substantially perpendicularly and another blade having a surface portion disposed at an acute angle. The cleaning device may be arranged with its at least one blade adjacent the end wall portion such as to sweep the end wall portion free from biomass material.
According to a second aspect of the invention, there is provided a biomass treatment arrangement comprising a biomass treatment reactor and a discharge screw arrangement according to the first aspect of the invention or embodiments thereof, wherein the inlet of the discharge screw arrangement is arranged to receive biomass material from an outlet of the treatment feaCtOf.
In embodiments, the biomass treatment arrangement comprises a reactor vessel and an internal conveyor screw rotatably arranged in said reactor vessel, the internal conveyor screw being configured to mechanically transport the biomass material through the reactor vessel in a conveying direction along a rotational axis of the internal conveyor screw and out through the outlet, the outlet being disposed at a downstream end of the reactor vessel.
In embodiments, the reactor vessel may be a substantially horizontally arranged reactor vessel, wherein the discharge screw arrangement is located vertically below the reactor vessel at the downstream end of the reactor vessel, such that the biomass material can fall down vertically from the outlet of the reactor vessel into inlet of the discharge screw arrangement. Alternatively, the reactor vessel may be a substantially vertically arranged reactor vessel, wherein the inlet of the discharge screw arrangement is arranged substantially in line horizontally with an outlet of the reactor vessel.
The features of the embodiments described above are combinable in any practically realizable way to form embodiments having combinations of these features. Further, all features and advantages of embodiments described above with reference to the first aspect of the invention may be applied in corresponding embodiments of the arrangement according to the second aspect of the invention and vice versa.
According to a third aspect of the invention, there is provided a biomass treatment arrangement comprising a reactor vessel/chamber provided with an inlet for receiving biomass material and an outlet for discharging the treated biomass material. An internal conveyor screw is rotatably arranged in said reactor vessel, the internal conveyor screw being configured to mechanically transport the biomass material through the reactor chamber in a conveying direction along a rotational axis of the internal conveyor screw and out through the outlet, the outlet being disposed at a downstream end of the reactor vessel. The outlet is disposed in/through an end wall portion of the reactor vessel at the downstream end thereof, wherein the end wall portion may be disposed at an angle relative said rotational axis. A cleaning device may be rotatably arranged in the reactor vessel adjacent the end wall portion. The cleaning device may be configured to transport the biomass material in a direction being opposite the flow direction and/or in a direction of rotation ofthe cleaning device, i.e. in a direction having components in a direction being opposite the flow direction and/or in a direction of rotation ofthe cleaning device. The cleaning device may be described as arranged to sweep or clean biomass material off the end wall portion. The above described may features of embodiments of the first aspect of the invention may be applied in corresponding embodiments of the arrangement according to the third aspect of the invention, where it is understood that the internal conveyor screw corresponds to the discharge screw, and that the reactor vessel corresponds to the discharge chamber.
BRIEF DESCRIPTION OF THE DRAWINGS Above discussed and other aspects of the present invention will now be described in more detail using the appended drawings, which show presently preferred embodiments of the invention, wherein: fig. 1 shows an embodiment of a biomass treatment arrangement according to the second aspect of the invention comprising a discharge screw arrangement according to the first aspect of the invention; fig. 2 shows another embodiment of a biomass treatment arrangement according to the second aspect of the invention comprising a discharge screw arrangement according to the first aspect of the invention; fig. 3 shows parts of an embodiment of a discharge screw arrangement according to the first aspect of the invention, and fig. 4 shows the discharge screw and the cleaning device of the discharge screw arrangement in fig. 3.
DETAILED DESCRIPTION Fig. 1 shows a cut-away side view of an embodiment of a biomass treatment arrangement for treatment of the according to the second aspect of the invention comprising a discharge screw arrangement according to the first aspect of the invention. The biomass treatment arrangement comprises a biomass treatment reactor formed by a horizontally arranged cylindrical reactor vessel 3 provided with an internal conveyor screw 3b rotatably arranged in the reactor vessel. The internal conveyor screw 3b is configured to mechanically transport the biomass material through the reactor vessel in a conveying direction (indicated by the arrow in the reactor vessel) in parallel with the rotational axis of the internal conveyor screw and out through an outlet 8, the outlet being disposed at a downstream end of the reactor vessel. The reactor vessel 3a is provided with an inlet (schematically indicated by an arrow) for lignocellulosic biomass at a flow-wise upstream end of the reactor vessel at an upper portion of the reactor vessel. The reactor vessel is further provided with steam injection nozzles (schematically indicated by two arrows at the bottom of the reactor vessel) for hydrothermal treatment of the biomass.
The biomass treatment arrangement further comprises a discharge screw arrangement. The inlet 2 of the discharge screw arrangement is arranged to receive biomass material from the outlet 8 of the treatment reactor. The discharge screw arrangement is located vertically below the reactor vessel at the downstream end of the reactor vessel, such that the biomass material falls down vertically from the outlet 8 of the reactor vessel into the inlet 2 of the discharge screw arrangement.
The discharge screw arrangement comprises a discharge chamber 1 being cylindrically formed and being provided with the inlet 2 and an outlet 4 for discharging the biomass material. The inlet is arranged at a first longitudinal end (an upstream end as seen in the flow direction) of the discharge chamber at an upper portion thereof. A discharge screw 5 is rotatably arranged in the discharge chamber 1, the discharge screw being configured to mechanically transport the biomass material from the inlet through the discharge chamber in a flow direction (indicated by an arrow in the discharge chamber) substantially along the rotational axis 5a of the discharge screw 5 and out through the outlet 4. The outlet is formed as a nozzle disposed in/through an end wall portion of the end wall 1a of the discharge chamber at the downstream end thereof. In this embodiment, the end wall 1a is formed as a plane wall arranged perpendicularly relative the rotational axis 5a which means that the end wall portion in/ through which the outlet is arranged is also disposed at the same angle relative the rotational axis. The outlet is consequently directed, i.e. having its flow direction (as indicated schematically by the arrow through the outlet) in parallel with the rotational axis/flow direction. A steam explosion device 7 comprising a blow pipe 7a and a blow valve 7b (schematically illustrated) is connected to the outlet 4.
A cleaning device 6 is rotatably arranged in the discharge chamber adjacent the end wall 1a. The cleaning device is formed integrally with the discharge screw 5 such as to rotate therewith. The cleaning device 6 is configured to displace biomass material in a direction ofrotation of the cleaning device such as to sweep or clean the end wall portion from biomass material. This is achieved by means of the cleaning device being provided with blades 7a, 7b extending in a substantially radial direction relative the rotational axis of the cleaning device. In this embodiment, the blades are plane (similar to "flat irons") and extend with respective plane surfaces acting on the biomass material in radial planes, i.e. perpendicularly relative a plane of rotation of the cleaning device. Consequently, the blades force the biomass material in the rotational direction of the cleaning device, and thus "sweeps" the end wall 1a since the blades rotate in close proximity with the end wall.
Fig. 2 shows another embodiment of a biomass treatment arrangement according to the second aspect of the invention comprising a discharge screw arrangement according to the first aspect of the invention. This embodiment differs from the embodiment in fig. 1 in that the biomass treatment reactor is formed by a vertically arranged cylindrical reactor vessel 13 provided with a discharge screw rotatably arranged at the bottom of the reactor vessel to displace the biomass material towards the outlet 18. The reactor vessel 13 is provided with an inlet (schematically indicated by an arrow) for lignocellulosic biomass at an upper portion of the reactor vessel. The reactor vessel is further provided with steam injection nozzles (schematically indicated by two arrows at the side of the reactor vessel) for hydrothermal treatment of the biomass. The discharge screw arrangement is the same as in fig.1, except that the inlet 12 is arranged in line horizontally with the outlet 18 of the reactor vessel 13.
Figures 3-4 show parts of an embodiment of a discharge screw arrangement according to the first aspect of the invention. The discharge screw arrangement is similar to the embodiment shown in fig. 1 in that the cleaning device 26 rotates with the discharge screw 25. This embodiment differs from the embodiment in fig. 1 in that the cleaning device 26 is configured to displace biomass material in a direction being opposite the flow direction (to the left in the figure) and in the direction of rotation of the cleaning device (indicated by the direction of rotation around the axle of the discharge screw/ cleaning device) such as to not only sweep the end wall, but also to transport material away from the end wall. This is achieved by means of the cleaning device being provided with blades 27a-c extending radially relative the rotational axis of the cleaning device.
Each blade 27a-c is formed as a plane part comprising a plane surface acting on the biomass material (similar to a "flat iron"), wherein each plane part is supported by another part (see fig. 3-4). The plane surfaces are disposed at acute angles relative the plane of rotation of the cleaning device, see for example plane surface 27b' being arranged at an acute angle 27b" relative the plane 26b. Consequently, the blades force the biomass material in the rotational direction of the cleaning device and opposite the flow direction, and thus "sweeps" the end wall since the blades rotate in close proximity with the end wall and transports material away from the end wall.
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, the cleaning device shown in fig. 3-4 can be applied in the biomass treatment arrangement in fig. 1 or 2. Further, although the cleaning devices have all been shown with blades having plane surfaces acting on the biomass material, the blades can comprise one or more surface portions which are non- plane. For example, one and the same blade may be provided with one surface portion disposed substantially perpendicularly and an additional surface portion disposed at an acute angle.
Further, a different number of blades can be used.

Claims (1)

1.Claims Discharge screw arrangement for discharging biomass material, the discharge screw arrangement comprising: - a discharge chamber (1; 21) provided with an inlet (2; 12) for receiving biomass material from a biomass treatment reactor (3; 13), and an outlet (4; 24) for discharging the biomass material, - a discharge screw (5; 25) being rotatably arranged in said discharge chamber (1; 21), the discharge screw being configured to mechanically transport the biomass material from the inlet through the discharge chamber in a flow direction substantially along a rotational axis (5a) of the discharge screw and out through the outlet, the outlet being disposed at a downstream end of the discharge chamber, - a cleaning device (6; 26) rotatably arranged in the discharge chamber (1; 21) to rotate in a direction of rotation, wherein the outlet (4; 24) is disposed in an end wall portion (1a; 21a) of the discharge chamber at the downstream end thereof, the end wall portion being disposed at an angle (1a') relative said rotational axis, and wherein the cleaning device (6; 26) is arranged adjacent said end wall portion, the cleaning device being configured to displace the biomass material in a direction being opposite the flow direction and/or in the direction of rotation. Discharge screw arrangement according to claim 1, further comprising a steam explosion device (7) connected to the outlet. Discharge screw arrangement according to claim 2, wherein said steam explosion device (7) comprises a blow pipe (7a) and/or a blow valve (7b) and/or a blow orifice. Discharge screw arrangement according to any of the preceding claims, wherein the cleaning device (6; 26) is rotatably arranged around a rotational axis (6a; 26a) coinciding with the rotational axis (5a; 25a) of the discharge screw (5; 25). Discharge screw arrangement according to any of the preceding claims, wherein the cleaning device (6; 26) is arranged to rotate with the discharge screw (5; 25). Discharge screw arrangement according to any of the preceding claims, wherein the cleaning device (6; 26) is formed integrally with the discharge screw (5; 25). Discharge screw arrangement according to any of the preceding claims, wherein the cleaning device (6; 26) comprises at least one blade (7a-b; 27a-c) extending in a substantially radial direction relative the rotational axis (6a; 26a) of the cleaning device. Discharge screw arrangement according to claim 7, wherein one or more of the at least one radially extending blade (7a-b; 27a-c) comprises at least one substantially planesurface portion acting on the biomass material, which surface portion is disposed substantially perpendicularly relative a plane of rotation (6b; 26b) of the cleaning device. Discharge screw arrangement according to claim 7 or 8, wherein one or more of the at least one radially extending blade (27a-c) comprises at least one surface portion (27b') acting on the biomass material, which surface portion is disposed at an acute angle (27b") relative a plane of rotation (2 6b) of the cleaning device. Discharge screw arrangement according to any of claims 7-9, wherein one or more of the at least one radially extending blade comprises at least one surface portion being curved in a direction of rotation of the cleaning device. Discharge screw arrangement according to any of claims 7-10, wherein the cleaning device is arranged with its at least one blade (7a-b; 27a-c) adjacent the end wall portion (1a, 21a) such as to sweep biomass material offthe end wall portion. A biomass treatment arrangement comprising a biomass treatment reactor (3 ; 13) and a discharge screw arrangement according to any of the preceding claims, wherein the inlet (2 ; 12) of the discharge screw arrangement is arranged to receive biomass material from an outlet (8; 18) of the treatment reactor. Biomass treatment arrangement according to claim 12, wherein the biomass treatment reactor comprises: - a reactor vessel (3a); - an internal conveyor screw (3b) rotatably arranged in said reactor vessel, the internal conveyor screw being configured to mechanically transport the biomass material through the reactor vessel in a conveying direction along a rotational axis of the internal conveyor screw and out through the outlet (8), the outlet being disposed at a downstream end of the reactor vessel. Biomass treatment arrangement according to claim 13, where the reactor vessel (3) is a horizontal reactor vessel, and where the discharge screw arrangement is located vertically below the reactor vessel at the downstream end of the reactor vessel, such that the biomass material can fall down vertically from the outlet (8) of the reactor vessel into inlet (2) of the discharge screw arrangement.
SE2330057A 2023-02-01 2023-02-01 Discharge screw arrangement for discharging biomass SE2330057A1 (en)

Priority Applications (1)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0202120A2 (en) * 1985-05-14 1986-11-20 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Waste product feeder
CN107745927A (en) * 2017-11-29 2018-03-02 江苏润邦再生资源科技有限公司 A kind of cement additire continuous and quantitative proportioning machine
SE1851190A1 (en) * 2018-10-03 2020-04-04 Valmet Oy A discharge screw arrangement for discharging lignocellulosic material from a lignocellulosic treatment reactor
WO2020209771A1 (en) * 2019-04-08 2020-10-15 Valmet Ab Discharge screw assembly, reactor assembly and method for treatment of biomass material
US20210404116A1 (en) * 2018-10-31 2021-12-30 Valmet Ab Reactor discharge screw

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0202120A2 (en) * 1985-05-14 1986-11-20 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Waste product feeder
CN107745927A (en) * 2017-11-29 2018-03-02 江苏润邦再生资源科技有限公司 A kind of cement additire continuous and quantitative proportioning machine
SE1851190A1 (en) * 2018-10-03 2020-04-04 Valmet Oy A discharge screw arrangement for discharging lignocellulosic material from a lignocellulosic treatment reactor
US20210404116A1 (en) * 2018-10-31 2021-12-30 Valmet Ab Reactor discharge screw
WO2020209771A1 (en) * 2019-04-08 2020-10-15 Valmet Ab Discharge screw assembly, reactor assembly and method for treatment of biomass material

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