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With the ultimate aim of integrating the High-Temperature Winkler gasification process into a combined gas/steam turbine process, the pilot fluidised bed plant in Wesseling was put into operation in 1989. To understand the fluid mechanics of the circulating fluidised bed (CFB) installed there, a corresponding cold model has been investigated. For this purpose a new pressure fluctuation measuring technique was developed. With the aid of a mathematical model it was possible to identify the oscillation components which can lead to unwanted resonance effects. A weighing system installed in the first repressure pipe was used to measure the rotation speeds of solids for different operation settings. Tests with a dust measuring probe in various locations revealed that a representative sample can be obtained at the head of the gasifier. Using CO(2) as tracer gas it was shown that in a CFB no bypass streams occur in the repressure pipe because the gas is drawn along with the downward flowing solid matter. In the lower part of the fluidised bed good separation of sand and coke particles can be achieved at certain settings. Using constant temperature anemometry it was possible to demonstrate that heat transfer in a CFB is more intense than in a fluidised bed with low expansion.

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Authors: NASSENSTEIN C, Rheinische Braunkohlenwerke, Köln (DE);RUMMEL J, Rheinische Braunkohlenwerke, Köln (DE);SCHRADER L, Rheinische Braunkohlenwerke, Köln (DE)
Bibliographic Reference: EUR 13099 DE (1990) 190 pp., MF, ECU 8, blow-up copy ECU 23.75
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