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Dive into the research topics where John Erjavec is active.

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Featured researches published by John Erjavec.


Fuel | 2003

Heterogeneous oxidation of mercury in simulated post combustion conditions

Glenn A. Norton; Hongqun Yang; Robert C. Brown; Dennis L. Laudal; Grant E. Dunham; John Erjavec

Heterogeneous mercury oxidation was studied by exposing whole fly ash samples and magnetic, nonmagnetic, and size-classified fly ash fractions to elemental mercury vapor in simulated flue gas streams. Fly ash from sub-bituminous Wyodak–Anderson PRB coal and bituminous Blacksville coal were used. Scanning electron microscopy, X-ray diffraction, thermogravimetric analyses, and BET N2 isothermal sorption analyses were performed to characterize the fly ash samples. Mercury speciation downstream from the ash was determined using the Ontario Hydro method. Results showed that the presence of fly ash was critical for mercury oxidation, and the surface area of the ash appears to be an important parameter. However, for a given fly ash, there were generally no major differences in catalytic oxidation potential between different fly ash fractions. This includes fractions enriched in unburned carbon and iron oxides. The presence of NO2, HCl, and SO2 resulted in greater levels of mercury oxidation, while NO inhibited mercury oxidation. The gas matrix affected mercury oxidation more than the fly ash composition.


Other Information: PBD: 31 Jan 2002 | 2002

EFFECTS OF FLY ASH ON MERCURY OXIDATION DURING POST COMBUSTION CONDITIONS

Glenn A. Norton; Hongqun Yang; Robert C. Brown; Dennis L. Laudal; Grant E. Dunham; John Erjavec; Joseph M. Okoh

Tests were performed in simulated flue gas streams using two fly ash samples from the electrostatic precipitators of two full-scale utility boilers. One fly ash was derived from a Powder River Basin (PRB) coal, while the other was derived from Blacksville coal (Pittsburgh No. 8 seam). The tests were performed at temperatures of 120 and 180 C under different gas compositions. Elemental mercury (Hg) streams were injected into the simulated flue gas and passed over filters (housed in a convection oven) loaded with fly ash. The Ontario Hydro method was used to determine the total amount of Hg passing through the filter as well as the percentages of elemental and oxidized Hg collected. Results indicated that substantial amounts of Hg oxidation did not occur with either fly ash, regardless of the temperature used for testing. When oxidation was observed, the magnitude of the oxidation was comparable between the two fly ashes. These results suggest that the gas matrix may be more important than the ash components with respect to the distribution of Hg species observed in gaseous effluents at coal-fired power plants.


Archive | 2000

Modern Statistics for Engineering and Quality Improvement

John Erjavec


Fuel | 2004

Modeling reaction kinetics of steam gasification for a transport gasifier

Michael D. Mann; Ryan Z. Knutson; John Erjavec; Jason P. Jacobsen


Frontiers in Education | 2004

On-line laboratories for undergraduate distance engineering students

John Watson; George D. Bibel; K.A. Ebeling; John Erjavec; Hossein Salehfar; Marcellin Zahui


Journal of Engineering Education | 1995

Teaching Statistical Experimental Design Using a Laboratory Experiment

Douglas K. Ludlow; Kirk H. Schulz; John Erjavec


Archive | 2016

Basic Experimental Strategies and Data Analysis for Science and Engineering

John Erjavec


Archive | 2016

Basic Two-Level Factorial Experiments

John Erjavec


Archive | 2016

Response Surface Designs

John Erjavec


Archive | 2016

Variance Component Studies

John Erjavec

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Dennis L. Laudal

University of North Dakota

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Grant E. Dunham

University of North Dakota

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Michael D. Mann

University of North Dakota

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Rashid A. Hasan

University of North Dakota

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