Evaluation of a capillary-coriolis instrument for on-line viscosity and density measurements of kraft black liquor.APPLICATION: The capillary-coriolis viscometer viscometer Instrument for measuring the viscosity (resistance to internal flow) of a fluid. In one type, the time taken for a given volume of fluid to flow through an opening is recorded. can reliably measure on-line the viscosity and density of kraft black liquors Black liquor is a byproduct of the Kraft process, (also known as Kraft pulping or sulfate process) during the production of paper pulp. Wood is decomposed into cellulose fibers (from which paper is made), hemicellulose and lignin fragments. , including liquors with very high solids content. Increasing the concentration of solids in black liquor would be economically advantageous, but it would also increase the viscosity. The viscosity affects the transport and processing of black liquor and is sensitive to temperature. Controlling black liquors with high solids content takes an on-line viscometer that can reliably measure the viscosity. As part of a study of several on-line viscometers, these researchers evaluated the performance of a capillary-coriolis instrument in measuring the viscosity and density of black liquor on line. On-line measurements were compared with laboratory measurements of viscosity and density. Solids concentrations ranged from 34% to 74%, with temperatures up to 140[degrees]C. The viscometer performed reliably and was accurate to within [+ or -]10% of the laboratory reference viscosity. The sensor A device that measures or detects a real-world condition, such as motion, heat or light and converts the condition into an analog or digital representation. An optical sensor detects the intensity or brightness of light, or the intensity of red, green and blue for color systems. operated well under both steady-state and transient A malfunction that occurs at random intervals and lasts for a short duration such as a spike or surge in a power line or a memory cell that intermittently fails. See spike and power surge. transient - 1. conditions and did not experience fouling problems. The researchers concluded that the instrument can operate reliably over the ranges expected to be encountered in a mill. View this paper online at http://www.tappi.org/index.asp?pid=28865 Anthony P. Dutka, V.R. Basker, Oscar D. Crisalle, and Arthur L. Fricke are with the Chemical Engineering Dept. University of Florida University of Florida is the third-largest university in the United States, with 50,912 students (as of Fall 2006) and has the eighth-largest budget (nearly $1.9 billion per year). UF is home to 16 colleges and more than 150 research centers and institutes. , Gainesville, FL 32611-6005. Paul Kalotay, now retired, was with Micro Motion Inc. at the time of this work. Boulder Boulder, city, United States Boulder, city (1990 pop. 83,312), seat of Boulder co., N central Colo.; inc. 1871. A Rocky Mountain resort and a suburb of Denver, it is the seat of the Univ. of Colorado (1876). , CO 80301. Email Crisalle at cnsalle@che.ufl.edu. |
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