Thesis (M.S.)--Ohio State University, 1966. / Includes bibliographical references. Available online via OhioLINK's ETD Center

No description available.

No description available.

Thesis (M.S.)--West Virginia University, 1999. / Title from document title page. Document formatted into pages; contains xvii, 246 p. : ill. Includes abstract. Includes bibliographical references (p. 244-246).

Thesis (doctoral)--Lund University, 1996. / Added t.p. with thesis statement inserted.

Thesis (M.S.)--West Virginia University, 2005. / Title from document title page. Document formatted into pages; contains ix, 95 p. : ill. Includes abstract. Includes bibliographical references (p. 86-88).

Thesis (doctoral)--Lund University, 1996. / Added t.p. with thesis statement inserted.

A two part study was undertaken to explain the performance of cyclones operated in circulating fluidized bed combustion (CFBC) systems. In the first part, collection efficiency tests were performed on a one-ninth scale polyacrylic cyclone model of the industrial scale cyclone at the 22 MWe CFBC facility at Chatham, New Brunswick. Emphasis was placed on scale-up considerations, loading effects, inlet geometry effects, and flow visualization trials. Experiments were performed at room temperature with inlet velocities between 3.7 and 5.5 m/s, solids loading between 0.05 and 7.5 mass solids/mass air with two different solids systems. There was disappointing agreement between the results from the Chatham unit, scaled according to Stokes Number scaling, and the findings obtained from the cold model unit. There was a minimum in the particle collection efficiency for particles of diameter 2.5 to 3.0 µm, apparently associated with agglomeration effects in the cyclone. Particle collection efficiency was found to increase with increased particle loading for the conditions studied. Changes in the inlet geometry gave inconclusive results. The experimental results were limited by problems associated with feeding and recycling the fines solids system used. In the second part radial gas concentration profiles of a secondary cyclone serving the UBC pilot scale Circulating Fluidized Bed Combustor were performed at temperatures of about 870 ℃. Concentrations of O₂ , CO₂ , NO[formula omitted] , CH₄ , CO and SO₂ were measured. An increase in [CO], and to a lesser extent [CO₂], was measured near the cyclone wall. There appeared to be little radial variation in the concentration of other species. Further work is required to allow the cold model to operate continuously, with particles which can be fed more freely, and to obtain radial gas concentration profiles within the primary cyclone of the UBC CFBC system. / Applied Science, Faculty of / Chemical and Biological Engineering, Department of / Graduate

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<p>Mercury is the only metal that is in liquid form at room temperature and it has over the years been used in various combinations to extract gold, in measuring devices, medicaments, paper industry, batteries and fluorescent lights as well as in dentistry as dental amalgam. Dental amalgam is a mixture of 50 % mercury and 50% of an alloy consisting of silver, tin, copper and zink particles and has been used in dentistry for many years. The environmental effect of mercury release into the sewer from dental practices and clinics, and the inability of the wastewater treatment plants to remove it from the sludge lead to the introduction of amalgam separators in Sweden in 1980. The ISO standard 11143 regulates the efficacy of the amalgam separators, which should be at a 95% level, but is based on a laboratory test rather than a clinical evaluation.</p><p>This study looks at the available amalgam separators in use in four areas of Sweden, Uppsala, Stockholm, Östergötland and Skåne and compares their clinical efficiency. The clinical efficiency ranged between 75 to 95%, with most units below the 90% mark. In Östergötland a new improved separator is being tried, the Capere unit, which is based on finely ground pine bark treated with a chelator sensitive to all metals and used in conjunction with a cotton filter and a regular amalgam separator. This was shown to be superior to the other separators, with a 99, 9% removal of even the smallest amalgam particles and ionic mercury from the wastewater before leaving the clinic. Otherwise, combining more than one amalgam separator of the brands available on the Swedish market did not improve the efficiency of them.</p>