Method for the carrying out of a flotation, bleach and/or dispersion process serving for the manufacture of fiber or paper

Abstract

In a method for the carrying out of a flotation, bleach and/or dispersion process serving for the manufacture of fiber or paper while using one or more method stages in which process steps defined by pre-settable chemical and physical routines are carried out and process optimizations are made in dependence on measured values and characteristic values formed therefrom, optionally while using state models, at least the measured values of at least one method stage, which relevantly affect the target values of the respective end product of the method, are detected online and/or the characteristic values determined from the measured values of at least one method stage are evaluated online and used directly or indirectly for the control or optimization of at least one process, with characteristic values being formed in dependence on the starting materials or raw materials and/or on the chemicals, auxiliary materials, energies and/or materials and emissions to be disposed of, which are added in at least one method stage.

1 . A method for the carrying out of a flotation, bleach and/or dispersion process serving for the manufacture of fiber or paper while using one or more method stages in which process steps defined by pre-settable chemical and physical routines arc carried out and process optimizations are made in dependence on measured values and characteristic values formed therefrom, optionally while using state models, characterized in that at least the measured values of at least one method stage, which relevantly affect the target values of the respective end product of the method, are detected online; and/or in that the characteristic values determined from the measured values of at least one method stage are evaluated online and used directly or indirectly for the control or optimization of at least one process, with characteristic values being formed in dependence on the starting materials or raw materials and/or from the chemicals, auxiliary materials, energies and/or materials and emissions to be disposed of, which are added in at least one method stage.  
     
     
         2 . A method in accordance with  claim 1 , characterized in that the determination of the characteristic values from the online measured values is carried out using mathematical or economic algorithms.  
     
     
         3 . A method in accordance with  claim 1 , characterized in that, in particular when carrying out a flotation process, values specific to the raw material are detected for the determination of at least some of the measured values and characteristic values.  
     
     
         4 . A method in accordance with  claim 1 , characterized in that, in particular when carrying out of a flotation process, at least one of the following values is preferably detected for the determination of at least some of the measured values and characteristic values: measurable parameters such as ash content, consistency, optical properties, specks of contaminant, printing ink residues, pH values, temperatures, flows, currents, powers, filling levels, use of auxiliary materials and/or stickies in the inflow, accepted stock and/or reject and/or values (characteristic values) calculated from the measurable parameters such as whiteness increase, reaction or throughflow ties, specific work, solid material loss and/or ash loss and/or economic values such as cost of chemicals, of auxiliary materials, of water, of raw materials, of energy, of loss and/or of waste disposal which put the technological and economic values into relationship.  
     
     
         5 . A method in accordance with  claim 1 , characterized in that the maximization, minimization and/or maintaining constant of the production volumes, of the mechanical and/or optical properties and/or of the costs of the operating materials, raw materials and/or finished materials can be pre-set as the target values.  
     
     
         6 . A method in accordance with  claim 1 , characterized in that, in particular when carrying out a flotation process, preferably at least one of the following values is pre-set as the target values: constant quality of the respective end product of the method, constant solid material loss and/or minimum operating costs, in particular with a constant quality.  
     
     
         7 . A method in accordance with  claim 1 , characterized in that, in particular for the control or optimization of the flotation process, preferably at least one of the following process parameters is appropriately influenced: air content of the paper pulp suspension in at least one method stage, in particular in a primary stage and/or in a secondary stage, overflow volume flow in at least one method stage, in particular in a primary stage and/or in a secondary stage, bubble size, chemicals and/or the like.  
     
     
         8 . A method in accordance with  claim 1 , characterized in that in particular fluctuations due to the raw material in the characteristics values relevantly affecting the target values of the respective end product of the method are at least substantially compensated by an appropriate modification of at least one process parameters  
     
     
         9 . A method in accordance with  claim 8 , characterized in that, in particular for the control or optimization of at least one process by appropriately influencing a plurality of process parameters, at least some of the characteristic values are evaluated or weighted and the respective influencing of the process parameters takes place in dependence on the evaluated or weighted characteristic values.  
     
     
         10 . A method in accordance with  claim 1 , characterized in that at least two method stages and/or at least two processes are combined with one another and put together to form a respective jointly controlled and jointly optimized module.  
     
     
         11 . A method in accordance with  claim 10 , characterized in that a compressed or reduced number of characteristic values formed in a respective module is used for the control of one or more processes.  
     
     
         12 . A method in accordance with  claim 1 , characterized in that at least some of the target and characteristic values are transformed to a uniform base by means of a computing unit.  
     
     
         13 . A method in accordance with  claim 12 , characterized in that the price per unit quantity is selected as the uniform base.  
     
     
         14 . A method in accordance with  claim 1 , characterized in that, in particular with combined method stages and/or combined processes, preferably at least one of the following parameters is preset as the target values: constant optical properties, constant ash quantity, minimum and/or constant specks of contaminant, minimum losses, minimum use of chemicals and/or minimum energy input.  
     
     
         15 . A method in accordance with  claim 1 , characterized in that at least some of the target values is weighted prior to their use for the control and optimization of the process(es).  
     
     
         16 . A method in accordance with  claim 15 , characterized in that the weighting takes place via an evaluation in accordance with cost aspects and/or via the carrying out of a cost optimization.  
     
     
         17 . A method in accordance with  claim 1 , characterized in that in particular with combined method stages and/or combined processes, preferably at least one of the following values is used for the determination of at least some of the measured values and characteristic values: consistencies, ash concentrations, filling levels, overflow quantities, residual amounts of printing ink, residual amounts of peroxide, temperatures, pH values, dispersing work, fiber dimensions, chemical doses, dwell times, optical properties, mechanical properties.  
     
     
         18 . A method in accordance with  claim 1 , characterized in that an electronic control and/or regulation device is used to carry out the process.  
     
     
         19 . A method in accordance with  claim 1 , characterized in that the respectively verified technological process know how is integrated into the control or regulation device.  
     
     
         20 . A method in accordance with  claim 1 , characterized in that in particular a cost optimization is repeatedly carried out by means of the control and regulation device while taking the respective technological know-how into account.  
     
     
         21 . A method in accordance with  claim 1 , characterized in that the determination of at least some of the measured values and characteristic values is carried out via at least one sensor, in particular at least one sensor for the measurement of whiteness, online contamination, consistency, flow and/or level.