Abstract: The invention relates to separation of lignin from an aqueous slurry containing lignocellulosic biomass material, such as black liquor, comprising the steps of providing an aqueous slurry having an initial pH level to a first precipitation phase, where the first precipitation phase is performed during a first time duration including adding a first acidifier. Thereby, a decrease in the pH value of the aqueous slurry from the initial pH level to a first pH level above 11 is created. Thereafter, processed aqueous slurry is fed from the first precipitation phase to a second precipitation phase. The second precipitation phase is performed during a second time duration. The second precipitation phase includes adding of a second acidifier, wherein a decrease in the first pH value from said first pH level to a second pH level above 9 is created.

Abstract: A method for controlling a flocculation of green liquor includes: providing a green liquor treatment arrangement including: a mixing assembly for controlling mixing of green liquor and a flocculation agent, the mixing assembly including: a mixing vessel inlet, a mixing vessel outlet, and a stirring device, wherein: the mixing vessel has a length from a center of the mixing vessel inlet to a center of the mixing vessel outlet, the mixing vessel has a maximum width that is perpendicular to a center axis, and the length is at least 1.5 times the maximum width, and a clarifying vessel; supplying the green liquor and the flocculation agent to the mixing vessel through the vessel inlet; stirring the green liquor and flocculation agent with the stirring device; discharging the green liquor and flocculation agent through the vessel outlet and to the clarifying vessel.

Abstract: A blow valve 15 and a biomass processing system 1 comprising such a blow valve Said blow valve 15 being connectable in a blow line 7 which is connecting two differently pressurized vessels 3, 5 of the biomass processing system 1. Said blow valve 15 is configured for controlling the flow of biomass material and fluid in the blow line 7, wherein said blow valve 15 comprises a shutter valve 31 with a central opening 33 of controllable size, said shutter valve 31 comprising a number of valve plates 35 which are disposed in an annular pattern surrounding the central opening 33 of the shutter valve 31 and wherein said valve plates 35 are movable in relation to each other whereby the size of the central opening 33 is controlled by moving the valve plates 35.

Abstract: A rotary lime kiln includes a tubular lime kiln body having a first end comprising a burner and a second end adapted to receive lime to be burnt in the rotary lime kiln. A boost gas injector is arranged below the burner, at a lower part of the lime kiln. A method for controlling flame stability in a rotary lime kiln is also disclosed.

Abstract: A material transport arrangement for transporting biomass material in a system for treatment of biomass material includes: a plug screw feeder being a force-fed plug screw feeder and including a screw housing, a plug screw and a screw pipe, wherein said plug screw includes different sections along its length direction whereof a first section is at least partly enclosed by the screw housing and a second section is at least partly enclosed by the screw pipe, and a feeding device including a force-feeding screw connected to a screw housing inlet provided in one side of the screw housing of the plug screw feeder for feeding material from one side into the screw housing, said screw housing including a substantially cylindrical inner compartment.

Abstract: A blade for a refiner for refining lignocellulosic material, the blade being delimited by an inner periphery and an outer periphery and including: a blade surface with a refiner portion on which a plurality of refiner bars are arranged, wherein: each refiner bar extends from an outer bar end to an inner bar end, and the plurality of refiner bars are arranged so that a movement along a bar extension from an outer bar end to an inner bar end of a refiner bar is also a movement in a first circumferential direction; a dam that extends from an outer dam end to an inner dam end and connects at least three refiner bars; and a groove extending from the outer dam end to the inner dam end and adjacent to the dam on an outer side of the dam.

Abstract: A system for controlling the cleaning of a feeder housing in a high-pressure feeder includes: a high-pressure feeder including a housing that includes a tapered cylindrical chamber, the chamber having a drive end and an opposing tending end; a fluid conduit assembly operatively connected to the chamber, wherein the fluid conduit assembly includes a first conduit part configured to transport a first flow of cleaning fluid to the chamber via the tending end and a second conduit part configured to transport a second flow of cleaning fluid to the chamber via the drive end; a control valve configured to control the first flow of cleaning fluid; and a controller configured to receive a first input signal indicative of the initiation of a cleaning of the high-pressure feeder, and in response to the first input signal, control the control valve to reduce the first flow of cleaning fluid.

Abstract: Disclosed are a method and system for producing activated carbon The method comprises subjecting a carbon containing material to a steam explosion process in order to form a steam exploded carbon containing material, and pyrolyzing the steam exploded carbon containing material such that the activated carbon is formed. The system for producing activated carbon, the system comprises a steam explosion reactor assembly configured to subject a carbon containing material to a steam explosion process in order to form a steam exploded carbon containing material, and a pyrolyzer configured to pyrolyze the steam exploded carbon containing material such that the activated carbon is formed.

Abstract: A discharge arrangement for discharging lignocellulosic material includes: a screw conveyor section comprising an inlet for receiving lignocellulosic material from a treatment reactor; an outlet section configured to receive lignocellulosic material from the screw conveyor section; a conveyor screw rotatably arranged within the screw conveyor section for transporting the material in a material transport direction from the inlet to the outlet section; a material spreader rotatably arranged in the outlet section, which material spreader is rotatable in at least a first rotational direction around a rotational axis extending substantially in the material transport direction the material spreader; and a drive unit configured to rotate the material spreader around the rotational axis in at least said first rotational direction.

Abstract: A discharge arrangement for discharging lignocellulosic material includes: a screw conveyor section including an inlet for receiving lignocellulosic material; an outlet section configured to receive lignocellulosic material from the screw conveyor section; a conveyor screw rotatably arranged within the screw conveyor section for transporting the material in a material transport direction from the inlet to the outlet section; and a material spreader rotatably mounted within the outlet section, wherein the material spreader is rotatable in a first rotational direction and an opposite second rotational direction around a rotational axis extending in the material transport direction, which material spreader includes at least one blade configured to rotate around the rotational axis to transport the lignocellulosic material radially outwards and in the first and second rotational directions during rotation of the material spreader.

Abstract: A cooling shield for a liquor injection pipe of a liquor gun for supplying liquor to a combustion chamber of a recovery boiler, which has a first and a second side edge, the side edges extending in a longitudinal direction (L) of the cooling shield, and a first end edge and a second end edge extending between the side edges, the cooling shield comprising an outside shield wall, and an inside shield wall, the outside shield wall and the inside shield wall being connected along the side edges of the cooling shield, the cooling shield comprising a cooling medium space being arranged between the outside shield wall and the inside shield wall, the cooling shield comprising a cooling medium inlet and a cooling medium outlet the cooling medium inlet and the cooling medium outlet being arranged in communication with the cooling medium space.

Abstract: Method for treating biomass, comprising compressing and dewatering (62) the biomass to a dry solid content of DS1% by weight; feeding (63) compressed biomass to a treatment vessel; adding (64) a treatment liquid to said treatment vessel; discharging (65) treated biomass; compressing and dewatering (66) discharged biomass to a dry solid content of DS2% by weight, and treating (68) the compressed and dewatered biomass in a hydrolysis reactor, wherein 1%<DS1?DS2<6%.

Abstract: The present invention relates to a method for treating green liquor in a green liquor treatment arrangement, wherein the method comprises—adding (101) a flocculation agent to green liquor to form flocculated green liquor, —supplying (102) the flocculated green liquor to a clarifying vessel for separating flocculated green liquor into flocculated matter and clear green liquor, —removing (103) flocculated matter through a sludge outlet, and—removing (104) clear green liquor from the clarifying vessel, wherein the method further comprises—measuring (201) a flocculation of the green liquor, wherein said measuring takes place after adding the flocculation agent but before supplying the flocculated green liquor to the clarifying vessel. The invention also relates to a green liquor treatment device.

Abstract: Method for treating biomass material, comprising impregnating (201) the biomass material with sulfur dioxide and/or sulfurous acid in an impregnation reactor, subjecting the biomass material to hydrothermal treatment (202) in a pretreatment reactor, and determining (204) a flow, or a parameter indicative of a flow, of gases vented off from an upper portion of the pretreatment reactor The method further comprises controlling (205a, 205b) the impregnating based on the flow of gases, or the parameter indicative of the flow of gases. A corresponding system is also provided.

Abstract: A blade for a refiner for refining lignocellulosic material is delimited by an inner periphery and an outer periphery and includes: a blade surface with a refiner portion on which a plurality of refiner bars are arranged, where: each refiner bar extends from an outer bar end to an inner bar end, and the plurality of refiner bars are arranged so that a movement along a bar extension from an outer bar end to an inner bar end of a refiner bar is also a movement in a first circumferential direction; and a dam that extends from an outer dam end to an inner dam end and connects at least three refiner bars, and wherein the dam is arranged so that a movement along a dam extension from an outer dam end to an inner dam end is also a movement in the first circumferential direction.

Abstract: A high performance through-air apparatus is provided. The though-air apparatus includes a through-air roll configured for rotational movement about a first axis, and a high flow circuitous air path inside of the apparatus that includes a path extending through a supply conduit, through the through-air roll, and also through an exhaust conduit. The through-air apparatus also includes a plurality of turning vanes positioned within the high flow circuitous path positioned to guide the flow of air through the apparatus. The through-air apparatus has a length, a width, a height, which together define a volume having a compact configuration. The high flow circuitous air path inside of the apparatus has a length, where the ratio of the volume of the through-air apparatus to the length of the high flow circuitous air path is less than 20 m2.

Abstract: A fiber pulp processing system includes: a mixer including: a porous metallic material. The porous metallic material has been built by additive manufacturing, and at least a part of a surface of the porous metallic material has been polished by vibration polishing. The fiber-pulp processing system is configured such that, while the mixer mixes fiber pulp, a fluid is dispersed through the porous metallic material into the fiber pulp.

Abstract: A method for removing one or more non-process elements (NPE) in a Kraft pulping process in a Kraft pulp mill, the method comprising using NaHCO3 derived from a green liquor H2S stripping process to solubilize non-process elements (NPE) accumulated in a lime cycle process in the Kraft pulp mill and removing the solubilized one or more non-process elements from the lime cycle process.

Abstract: A method for bleaching pulp formed from recycled textile material comprising cellulose The method comprises subjecting the pulp to at least Pulp formed from one bleaching stage (2), after a final bleaching stage of said at least one bleaching stage, washing (3) the pulp, and after said washing, acidifying (4) the pulp.

Abstract: A through-air apparatus for drying or bonding paper, tissue, or nonwoven webs is provided. The through-air apparatus includes a through-air roll configured for rotational movement about a first axis, the through-air roll having a first end and a second end. The through-air apparatus includes an exhaust duct/passage adjacent to the first end of the through-air roll, and a hood encompassing a portion of the through-air roll, where the hood defines an active arc length of the through-air roll positioned inside of the hood. The through-air apparatus further includes a first shroud extending substantially from the exhaust duct to the hood, the first shroud configured to reduce the amount of process air inside of the through-air apparatus that is released out of the through-air apparatus and reduce the amount of air outside of the apparatus that leaks into the through-air apparatus.