Method and apparatus for estimating relative proportion of wood chips species to be fed to a process for producing pulp

a technology of relative proportion and pulp, applied in the field of pulp and paper process automation, can solve the problems of instability of the control of this variable, the inability to adjust the process parameters, etc., to achieve the effect of optimizing process parameter adjustment, optimizing process parameters, and stabilizing chip feeding control

a technology of relative proportion and pulp, applied in the field of pulp and paper process automation, can solve the problems of instability of the control of this variable, the inability to adjust the process parameters, etc., to achieve the effect of optimizing process parameter adjustment, optimizing process parameters, and stabilizing chip feeding control

US20060278353A1Inactive Publication Date: 2006-12-14CENT DE RES & DEV IND DU QUEBEC
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  • Method and apparatus for estimating relative proportion of wood chips species to be fed to a process for producing pulp
  • Method and apparatus for estimating relative proportion of wood chips species to be fed to a process for producing pulp
  • Method and apparatus for estimating relative proportion of wood chips species to be fed to a process for producing pulp

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Embodiment Construction

[0037] After further weighing the importance of many chip physical characteristics, it has been found that while chip density is an important parameter closely associated with species, that variable was lacking in prior art modeling for the purpose of wood species monitoring. Basically, according to the present invention, It has been discovered that a relation between density data along with one or more light reflection-related properties in one hand, and wood species characterizing the wood chips coming from a plurality of sources in the other hand, may be implemented in a model, which can then be used to estimate relative proportion of wood chip species in a mass of wood chips obtained from said sources. It has been found that such estimation may be advantageously used for monitoring variation of wood species composition, so as to allow selective discharge adjustment of the chip sources in order to stabilize wood species composition to be fed to a TMP or chemical pulping process. ...

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Abstract

Improved methods and apparatus for estimating and controlling relative proportion of wood chips originating from a plurality of sources characterized by various wood species, in a mass of wood chips to be fed to a process for producing pulp, use light reflection-related and density-related properties as input in a model characterizing a relation between such wood chip properties and species information. This principle allows efficient monitoring of the variation in wood species composition characterizing the wood chips to be processed, for the purpose of stabilizing chip feeding control and optimizing process parameters adjustment.

Description

FIELD OF THE INVENTION [0001] The present invention relates to the field of pulp and paper process automation, and more particularly to methods and apparatus for estimating and controlling relative proportion of wood chips originating from a plurality of sources characterized by various wood species, in a mass of wood chips to be fed to a process for producing pulp. BACKGROUND OF THE INVENTION [0002] Wood chips being one of the main raw materials entering into pulp production processes such as chemical (Kraft) and thermomechanical pulping (TMP) processes, variations in their physical properties have a direct impact on process control performance as well as on pulp and paper qualities. In the particular case of TMP processes, the quality of wood chips being fed to the refiners is of a great importance, since it is known to affect, along with process operating parameters, the rate of wear affecting refiner plates, as discussed by Myllyneva, J. et al. in “Fuzzy Control of Thermomechani...

Claims

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Application Information

Patent Timeline
14 Dec 2006
Publication
US20060278353A1
IPC
D21C7/14
CPC
D21B1/02; G01N21/3559; D21D1/002
Inventors
DING, FENG