Fly ash from a coal-fired power plant was redispersed and fed into a wind tunnel at concentration... more Fly ash from a coal-fired power plant was redispersed and fed into a wind tunnel at concentrations corresponding roughly to clean and dirty stack conditions. Data were obtained with two standard cascade impactors (using gravimetric mass determination), a set of series cyclones, a cascade impactor with piezoelectric crystal sensors, a cascade impactor using beta attenuation to determine collected mass, and an optical single-particle counter using a laser light source. No simple correlation could be established between the results of the optical instrument and those of the inertial classification devices, due to the probable nonuniformity of particle shape and density.
ABSTRACT Dust particles originally generated by two steelmaking processes were dispersed in an ai... more ABSTRACT Dust particles originally generated by two steelmaking processes were dispersed in an air stream and passed through a pilot-scale high gradient magnetic filter. In accordance with theoretical predictions, the experimental results showed that collection was improved by increasing the depth or density of the steel wool filter, increasing the applied magnetic field, or decreasing the filtration velocity. Collection efficiency increased with particle size up to about 2 μm, above which the efficiency tapered off, apparently due to reentrainment effects. Collection efficiencies of greater than 99% were obtained, indicating that high gradient magnetic filtration may be a practical method of controlling particulate emission from processes in the iron and steel industry.
The report reviews and evaluates a number of absorption-based SO control systems and the applicat... more The report reviews and evaluates a number of absorption-based SO control systems and the application of these control systems to those U.S. primary copper smelters which generate weak SO-containing gas streams. Capital and operating cost relationships have been developed for each specific process, covering a range of gas flows and SO concentrations. Separate general costs for gas pretreatment and the end-of-the-line SO utilization facilities (i.e., sulfuric acid, elemental sulfur, and liquid SO plants) are also provided. The 13 U.S. primary copper smelters which currently still generate weak SO streams have been reviewed with reference to their current operation and active programs in hand to control or eliminate weak SO streams. Appropriate SO control processes have been matched with the individual smelters and related capital and operating costs have been developed from the earlier established cost relationships. (GRA)
A hierarchical model of mental growth can be used as the basis for developing critical thinking s... more A hierarchical model of mental growth can be used as the basis for developing critical thinking skills in polymer science and engineering undergraduates. Specifically, mental growth constitutes a progression through a hierarchy of cognition. The critical thinking and judgment required of scientists and engineers lies at an upper level in the hierarchy, and to reach high levels, an individual must master cognitive skills and reorganize knowledge gained at lower levels. Teaching and learning devices that exercise low-level cognitive skills and that support effective development of critical thinking are presented. Assessment instruments that monitor student growth and evaluate the effectiveness of these teaching and learning devices are also described.
The report describes results of visits to Japan to assess research and development of new particu... more The report describes results of visits to Japan to assess research and development of new particulate control technology, and to evaluate the applicability of the Aut-Ainer particulate control device to diesel engines. New technology observed includes hooding systems for coke oven charging and pushing, fugitive emissions control in a Q-BOP furnace building, novel electrostatic precipitators (ESPs), magnetic separators, and hybrid
This article is the second in a series of ASEE proceedings that describes the implementation and ... more This article is the second in a series of ASEE proceedings that describes the implementation and assessment of using a hierarchical model of mental growth as the basis for developing critical thinking skills and engineering judgment in engineering undergraduates. Briefly, the hierarchical mental growth model of Egan provides our roadmap for developing effective teaching and learning strategies that are applied
This presentation illustrates the framework for implementing a hierarchical model of mental growt... more This presentation illustrates the framework for implementing a hierarchical model of mental growth as the basis for developing critical thinking skills and engineering judgment in engineering undergraduates. We adopt the hypotheses that mental growth constitutes a progression through a hierarchy of cognition, that the critical thinking and judgment required of engineers lies at an upper level in the hierarchy, and
Fly ash from a coal-fired power plant was redispersed and fed into a wind tunnel at concentration... more Fly ash from a coal-fired power plant was redispersed and fed into a wind tunnel at concentrations corresponding roughly to clean and dirty stack conditions. Data were obtained with two standard cascade impactors (using gravimetric mass determination), a set of series cyclones, a cascade impactor with piezoelectric crystal sensors, a cascade impactor using beta attenuation to determine collected mass, and an optical single-particle counter using a laser light source. No simple correlation could be established between the results of the optical instrument and those of the inertial classification devices, due to the probable nonuniformity of particle shape and density.
ABSTRACT Dust particles originally generated by two steelmaking processes were dispersed in an ai... more ABSTRACT Dust particles originally generated by two steelmaking processes were dispersed in an air stream and passed through a pilot-scale high gradient magnetic filter. In accordance with theoretical predictions, the experimental results showed that collection was improved by increasing the depth or density of the steel wool filter, increasing the applied magnetic field, or decreasing the filtration velocity. Collection efficiency increased with particle size up to about 2 μm, above which the efficiency tapered off, apparently due to reentrainment effects. Collection efficiencies of greater than 99% were obtained, indicating that high gradient magnetic filtration may be a practical method of controlling particulate emission from processes in the iron and steel industry.
The report reviews and evaluates a number of absorption-based SO control systems and the applicat... more The report reviews and evaluates a number of absorption-based SO control systems and the application of these control systems to those U.S. primary copper smelters which generate weak SO-containing gas streams. Capital and operating cost relationships have been developed for each specific process, covering a range of gas flows and SO concentrations. Separate general costs for gas pretreatment and the end-of-the-line SO utilization facilities (i.e., sulfuric acid, elemental sulfur, and liquid SO plants) are also provided. The 13 U.S. primary copper smelters which currently still generate weak SO streams have been reviewed with reference to their current operation and active programs in hand to control or eliminate weak SO streams. Appropriate SO control processes have been matched with the individual smelters and related capital and operating costs have been developed from the earlier established cost relationships. (GRA)
A hierarchical model of mental growth can be used as the basis for developing critical thinking s... more A hierarchical model of mental growth can be used as the basis for developing critical thinking skills in polymer science and engineering undergraduates. Specifically, mental growth constitutes a progression through a hierarchy of cognition. The critical thinking and judgment required of scientists and engineers lies at an upper level in the hierarchy, and to reach high levels, an individual must master cognitive skills and reorganize knowledge gained at lower levels. Teaching and learning devices that exercise low-level cognitive skills and that support effective development of critical thinking are presented. Assessment instruments that monitor student growth and evaluate the effectiveness of these teaching and learning devices are also described.
The report describes results of visits to Japan to assess research and development of new particu... more The report describes results of visits to Japan to assess research and development of new particulate control technology, and to evaluate the applicability of the Aut-Ainer particulate control device to diesel engines. New technology observed includes hooding systems for coke oven charging and pushing, fugitive emissions control in a Q-BOP furnace building, novel electrostatic precipitators (ESPs), magnetic separators, and hybrid
This article is the second in a series of ASEE proceedings that describes the implementation and ... more This article is the second in a series of ASEE proceedings that describes the implementation and assessment of using a hierarchical model of mental growth as the basis for developing critical thinking skills and engineering judgment in engineering undergraduates. Briefly, the hierarchical mental growth model of Egan provides our roadmap for developing effective teaching and learning strategies that are applied
This presentation illustrates the framework for implementing a hierarchical model of mental growt... more This presentation illustrates the framework for implementing a hierarchical model of mental growth as the basis for developing critical thinking skills and engineering judgment in engineering undergraduates. We adopt the hypotheses that mental growth constitutes a progression through a hierarchy of cognition, that the critical thinking and judgment required of engineers lies at an upper level in the hierarchy, and
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