Boots – shoes – and leggings
Patent
1992-06-15
1995-03-28
Gordon, Paul
Boots, shoes, and leggings
364164, 364510, G05B 1304
Patent
active
054023335
ABSTRACT:
The present invention is a system and method for improving stream composition and/or product property estimates from process models, which better reflect the true conditions of the process. One or more process simulation models are run on a computer in parallel with the actual process to provide estimates of stream composition and/or product properties to be used to control the process. Adjustments are made to the models to maintain them in alignment with continuously measured key process variables that are closely related to stream composition and/or product properties where such a relationship exists. This greatly improves the ability of the model to track the actual process. Additional adjustments are made to both the models and to the model estimates based on differences between measured and calculated stream composition/product properties. The combination of model calibration adjustments and direct correction of model estimates greatly improves the accuracy of the stream composition/product property estimates. Adjustments are made to model input variables and model parameters through use of controllers acting on the difference between measured and calculated properties. Differences obtained using relative error or the logarithm of the ratio of the measured and calculated values produce improved adjustments of component concentrations at low concentrations. Artificial measurements of stream composition and/or product properties can be synthesized by combining model composition estimates and flows at two or more locations in the process with an analytical measurement to produce and artificial analytical value at a second location in the process.
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E. I. Du Pont de Nemours & Co., (Inc.)
Gordon Paul
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