METHOD AND ARRANGEMENT FOR FEEDBACK BASED CONTROL IN CHEMICAL REFINING OF WOOD

• Main Authors: Turunen, Sami, Tamper, Juha, Laitila, Mika
• Format: Patent
• Language: English
• Published: 31.03.2022
• Subjects: CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW ORSIMILAR MATERIALS; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; NAILING OR STAPLING MACHINES IN GENERAL; PERFORMING OPERATIONS; PHYSICS; PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FORIMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILARMATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITHPERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; TESTING; TRANSPORTING; WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL

Method and control system are provided for controlling values of process parameters of a pretreatment process of wood particles. A sampler is used to obtain a sample of a product flow of said pretreatment process after said wood particles have undergone steam explosion in a hemihydrolysis reactor. A particle measurement device is used to measure one or more characteristics of particles in said sample and to produce one or more pieces of measurement information indicative of the measured characteristics. Said one or more pieces of measurement information are used to select one or more values of one or more of said process parameters.