Aeration using bubble clusters is a central practice in biol. and industrial process technol.The oxygen transfer capacity of state-of-the-art aeration elements was analyzed by means of sulphite (SIV) oxidation in liquid phase.Oxygen transfer rate, oxygen transfer efficiency and specific values for the size of the interphase were derived.Measurements were carried out in a pilot scale seawater flue gas desulphurisation plant, using an aeration basin equipped with a gas-tight cover.Aeration elements representing different types and materials were installed in the basin and fed with pressurised dried air.Liquid temperature and pH were controlled during experiments 0.5 mol/l sulphite solution was used for the experiments, which were carried out at pH = 9 and Tl = 22-25 °C in presence of a cobalt catalyst.Under these conditions, the liquid phase mass transfer resistance was negligible, allowing the determination of the interphase.Elements were tested at rates of feed flow [formula omitted].The oxygen consumption due to oxidation of the sulphite, which is a direct measure of the transferred gas flux, was derived by means of two measurement methods: exhaust gas anal. and iodometry.While the results of both methods showed comparable trends, discrepancies in total mass transfer were found, which were attributed to the exptl. setup.Results showed significant differences in characteristics of the tested aeration elements.Influences due to assembly regarding the orientation of an element inside an aeration basin were analyzed for pipe aerators with double-sided perforation.

VGB PowerTech

Planning of and operating experience with the Baruth wood-fired power plant

Author: Bassfeld, M. ; Voss, W. ; Manderbach, M.

In Nov. 2000, Standardkessel Lentjes GmbH secured an order to plan, design, produce, and commission a power plant for the fiberboard works of Kunz Holding GmbH in Baruth, Germany, for a total furnace heat output of 110 MW.At the Baruth site in Brandenburg, a completely new fiberboard works was constructed in a newly developed industrial estate.

Muell und Abfall

Determination of different binding forms of carbon - TOC, TIC, and TEC - in grate ashes of W-t-E plants

Author: Herden, Hansjorg ; Kuehnel, Jochen ; Delle, Frank ; Moser, Christian

It is well known that the common anal. methods for determination of the TOC (total organic carbon) parameter are very problematic and may become subject to misinterpretation.We used a special elementary analyzer (Leco RC 412) for a detailed investigation of grate ashes from 3 different municipal solid waste incineration plants in Germany.The elementary analyzer allows a simultaneous detection of the release oxidation products of CO₂ and H₂O depending on the temperature (temperature programmed oxidation).The most important parts of carbon in grate ashes are bonded as carbonates (inorganic carbon) and similar to coal (elementary carbon).The TOC content was <1.0 weight% which documented an excellent burnout of the ashes investigated.

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