Abb Ab

Abb Lummus Global Inc.

Valmet Fibertech Ab

Andritz Technology and Asset Management Gmbh

Stefan Backa

Thomas Liljenberg

Anna Kornfeldt

Ulf Persson

Erik Dahlquist

Eva Lundberg

Claudio Pecorari

Lennart Thegel

Markku Rissanen

Lars Peter Nilsson

Anders Andr&eacute;n

Johan Ekh

Xiaolong Feng

Xiaojing Zhang

Rebei Bel Fdhila

A computer based method for controlling an industrial process that includes at least two unit processes, including the steps of directly controlling the process by a control model including one or more algorithms, and automatic diagnosis of the validity of the process data retrieved from the process for the purpose of preventing irrelevant process data from being used as an input in the control model.

Computer based method and system for controlling an industrial process

In the present invention a refiner () of a mechanical pulping line is supplied with a controllable acoustic source (), arranged for emitting acoustic signals into the pulp fluid. The controllable acoustic signal is allowed to interact with the fibres in the pulp, and the acoustic (pressure) signals resulting from such an interaction is measured. At least one spectral component is measured. The measured spectral component is used to predict properties, content and/or size of the fibres. These properties may then be used to control the refiner () process. The used acoustic signal has preferably a wavelength that is large compared with a typical site of the particles.

Refiner control

A method and device for monitoring and controlling a pharmaceutical, chemical or food process, in which the biological activity and/or the bio-mass of micro-organisms in the process is monitored, and in which the state of the process is detected by monitoring viscosity and/or aggregate size and/or content of a dispersion of proteins, crystalline particles or fat droplets that are processed, respectively. The micro-organisms and/or bio-molecules produced in the process, and the proteins, crystals particles or fat droplets being processed are monitored by means of acoustic spectroscopy.

Method and device for monitoring and controlling a process

A method in consolidation and drying of paper. A wet web is contacted with superheated steam, whose temperature is 200-600&deg; C. for the purpose of reducing, by heat transfer from the superheated stream, the water content of the web by evaporation of a substantial part of the water in the same. The wet web is supported and transported by means of a heat-conductive, gas-impermeable belt whose width is equal to or exceeds the width of the web, and jets of the superheated steam are directed towards the side of the web facing away from the belt.

Method in drying of paper

A method and a device for controlling a process ( ), having at least two sub-processes ( ), by tracking, processing and correcting variables for the product, the production means and/or any process media throughout the process line. The process flow for the first sub-process ( ) is divided into slices, each slice representing a specific volume of process flow. At least some of the measured and sampled variable values are related to its specific slice volume. Any variable value obtained is processed using a control and processing, unit ( ) with means for receiving, information on variable values on-line, means for presenting ( ) the process flow through the production units, means for dividing the process flow into slices, means for processing a variable value obtained, including means for relating, the variable value to is specific slice volume, means to develop one or more multivariate models based on variable values for a multiple of slice volumes and means to combine the multivariate model with a processed variable value for a specific slice volume to predict a variable value and/or a quality variable for subsequent second sub-process ( ). Corrective actions are executed in the subsequent second sub-process ( ) based on a processed variable value from the first sub-process ( ) using, actuating, means ( ) for execution of corrective action.

Method and device for controlling an essentially continuous process

A shaped sintered fibrous porous body exhibits a structure with a three-dimensional corrugated or undulating shape and porosity. The structure includes inorganic fibers joined as a sintered structure and is produced in one embodiment by: dispersing and suspending a fiber mixture including inorganic fibers and organic binder, such as cellulose fibers, or other organic compounds, in a liquid to form a fibrous slurry; forming a body including the fiber mixture by depositing the slurry on a shaped screen to thereby shape the fibrous body to a three-dimensional configuration simultaneously with the formation of the body; removing at least a part of the liquid from the fibrous body through the screen by a vacuum; drying the fibrous body in the ambient atmosphere or in a furnace; heating the dried fibrous body to a first elevated temperature where the organic binder is removed from the body; subsequently heating the dried body to a second elevated temperature where the inorganic fibers are partly fused to form a sintered porous fibrous body with a three-dimensional corrugated or undulating configuration. The body is suitable for use as or included in reactor elements to provide gas/condensed phase mass transfer areas in a system involving processing or teatment of gases and/or vapors through distillation, absorption and/or catalytic reactions or the like requiring gas/condensed phase mass transfer, The body is also for enhancing fluid-catalyst mass transfer at low pressure drop and contacting between fluids or combinations thereof in single phase catalytic reactors.

Method for producing a sintered porous body

Method for drying wood raw material ( ) by means of hot gases ( ) supplied to the drying process, in which VOC, apart from water, evaporate from the wood raw material into the gases. The drying process is divided and carried out in at least two sub-steps (I, II), from which process gas ( ) is removed separately, and the drying process is thus controlled that VOC evaporate during one of the sub-steps, and the VOC are concentrated to this sub-step. The temperature of the gas containing VOC is increased to a temperature exceeding 180&deg; C. before VOC are oxidized catalytically at said elevated temperature, in order to reduce the discharge of VOC from the drying process.

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Karlstad, Sweden

Stefan Backa