Browsing by Author "Englund, David J"
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Item Analysis of Oxygen Injection in the Keewatin Taconite Kiln Transfer Chute Using Medusa Heat and Mass Balance Simulation and Mini-Pot Firing Tests(University of Minnesota Duluth, 2004-07-15) Englund, David JPerformance of the Medusa modeling and simulation of the Keewatin Taconite Line 2 furnace, simulating oxygen injection in the first few feet of the kiln to determine oxygen required to achieve magnetite oxidation levels equivalent to ported kiln performance, greater than 95% complete at the kiln discharge point.Item Demolition of a Shallow Bed and Reconstruction of a Deep Bed Sintering Pot Facility at the Coleraine Minerals Research Laboratory January 2008 through October 2009(University of Minnesota Duluth, 2009-10-15) Englund, David JDescribes the process of the demolition of a shallow bed and reconsruction of a deep bed sintering pot facility at the Coleraine Minerals Research Laboratory.Item Development of a Bed Permeability Test for Iron Ore Sintering(University of Minnesota Duluth, 2012) Englund, David JItem Development of a CFD Primary Cooling Fan Model for Prediction of Air Flow in the Primary Cooling Zone of Line 2 at United Taconite(University of Minnesota Duluth, 2008) Englund, David JA CFD model of the Line 2 Primary Cooling Fan (3A) has been developed and demonstrated to be capable of reproducing the fan curve as supplied with the fan. The effect of air temperature and inlet damper position have been simulated and used to produce a series of flow-pressure curves for the unit as it operates in the plant. The plant fan model appears capable of reproducing the air survey velocity pressure profiles measured on July 11, 2006. The United Taconite CFD Cooler Model was then used to develop a family of system resistance curves based on cooler operating parameters. The fan and system resistance curves, when combined, allow the fan operating point to be defined, from which flow can be predicted. Several linear models were developed and then used to predict plant performance, using the July 11, 2006, operating point. The predictions fall within 8% on a volume flow basis, within 6% on a mass basis. Additional operating points are needed to demonstrate the model's predictive capability over a flow range. Based on the results in this report, it appears possible that an on-line flow prediction model could be developed with additional research.Item Final Report: Shallow vs. Deep Bed Sintering(University of Minnesota Duluth, 2010) Englund, David JItem Next Generation Metallic Iron Nodule Technology in Electric Arc Steelmaking – Phase II(University of Minnesota Duluth, 2010) Fosnacht, Donald R; Iwasaki, Iwao; Kiesel, Richard F; Englund, David J; Hendrickson, David W; Bleifuss, Rodney LItem Oxygen Sensor Validation and Analysis of Process Air Oxygen Content at United Taconite(University of Minnesota Duluth, 2007-08) Englund, David J; Davis, Richard ACFX-TASCflow CFD Fortran formerly used to simulate magnetite oxidation and heat transfer between a pellet bed and cross flow gas stream has been revised and converted to ANSYS CFX 11 Command Expression Language for use in CFX11 CFD Cooler models. The conversion has been validated and found to yield consistent results when compared to the previous FORTRAN version. However, revision of the heat of reaction expression for magnetite oxidation now generates more heat release in the bed than the previous version, yielding higher predicted gas and solids temperatures under similar operating conditions. Future studies should focus on methods of estimating pellet entry temperature, incoming magnetite content, and cooling fan flow from plant measurements, to determine if current methods of estimation over-predict magnetite mass flow and solids entry temperatures, and under-predict cooling fan flow rates, as a means to resolve the trend toward higher temperatures in the model simulations. Most of the existing TASCflow cooler grids were found incompatible for CFX 11 simulations, necessitating development of new grids using Solid Works modeling software.Item Pot Grate Induration Simulator(University of Minnesota Duluth, 2007) Englund, David J; Davis, Richard AItem A Pot‐Grate Simulator for Experimental Evaluation of Heat Transfer, Drying, Flux Calcination, and Magnetite Oxidation Mechanisms in Pellet Induration Processes(University of Minnesota Duluth, 2005) Englund, David J; Davis, Richard AItem Process Modeling of Pellet Induration Furnaces(University of Minnesota Duluth, 2000-07-13) Davis, Richard A; Englund, David JThis report completes a two-year collaborative effort between Minntac, NRRI Coleraine Minerals Laboratory and UMD Chemical Engineering, aimed at modeling the Minntac Line 6 GrateKiln induration system. The goals of this research were twofold: 1. Develop numerical models of existing taconite induration operations. 2. Demonstrate application of these models for process analysis leading to improved process efficiency defined by increased productivity and reduced fuel costs.Item Simulation of Oxygen Injection in the Keewatin Taconite Rotary Kiln - Phase 2(University of Minnesota Duluth, 2004-12-15) Englund, David JPerformance of Medusa modeling and simulation of the Keewatin Taconite Line 2 Induration system, simulating use of oxygen-enriched air through a ported kiln design, and to determine oxygen requirements as a function of ported region length.