Virtual bleach plants part 1: mill applications.Application: VBP VBP Visual Basic Project (Microsoft; file extension) VBP Value-Based Pricing can help mills better evaluate economic, environmental, and product quality issues. Due to environmental regulations, bleach plants in U.S. pulp mills A pulp mill is a manufacturing facility that converts wood chips or other plant fiber source into a thick fiber board which can be shipped to a paper mill for further processing. are converting to elemental chlorine free (ECF (Enhanced Connectivity Facilities) IBM software that allows DOS PCs to query and download data from mainframes and issue mainframe commands. It also allows printer output to be directed from the PC to the mainframe. ) sequences. Filtrate filtrate /fil·trate/ (fil´trat) a liquid or gas that has passed through a filter. fil·trate v. To put or go through a filter. n. internal recycling in bleach plants also makes interaction among bleaching stages much stronger. Modeling and process simulation provide an effective way to understand these increasingly complicated bleach plants. Due to a lack of predictive bleaching models, existing process simulators cannot address bleaching-specific issues, such as the impact of chemical charges on pulp brightness. We have developed a set of predictive bleaching models, which are presented in this series of papers. Combining the new bleaching models with existing process simulators, most issues related to bleach plants, such as the effect of COD carryover on final brightness, can now be modeled. The Virtual Bleach Plant (VBP) is a new simulation approach that tries to "duplicate" real mill bleach plants. Users can selectively generate simulation results for their own mill applications. In this paper, the VBP is applied to two mill bleach plants. In Case A, we demonstrate the VBP's ability to duplicate real mill bleaching. In Case B, we use the VBP as a tool for mill bleach plant improvements. The simulation predicts the effects of shifting from 65% [ClO.sub.2] substitution to ECF and adding peroxide peroxide (pərŏk`sīd), chemical compound containing two oxygen atoms, each of which is bonded to the other and to a radical or some element other than oxygen; e.g. reinforcement in caustic extraction. S! Gu and Edwards are with the Department of Chemical Engineering University of Idaho The university was formed by the territorial legislature of Idaho on January 30, 1889, and opened its doors on October 3, 1892 with an initial class of 40 students. The first graduating class in 1896 contained two men and two women. , Moscow, ID 83843, USA. Email Edwards at jkidd@uidaho.edu. |
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