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Reconciliation of mass flow rate measurements in a chemical extraction plant
Author(s) -
Holly W.,
Cook R.,
Crowe C. M.
Publication year - 1989
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450670411
Subject(s) - flow (mathematics) , steady state (chemistry) , mathematics , extraction (chemistry) , statistics , chemical plant , least squares function approximation , process (computing) , mass flow , conservation of mass , econometrics , environmental science , mechanics , chemistry , computer science , physics , environmental engineering , chromatography , geometry , estimator , operating system
Since measurements of flow rates in a steady state chemical process are subject to errors, the laws of conservation and other constraints are violated. Total mass flow data from a chemical extraction plant are used to determine whether the process operated at steady state and to estimate the variances of the measurements. The data are then reconciled so as to minimize the weighted sum of squares of the adjustments and to test for gross error. Deletion of either of two particular flow rates is shown to remove all of the apparent gross errors in the data.