Abstract
In a fluidized bed boiler, the combustion efficiency, the NOX formation rate, flue gas desulphurization and fluidized bed heat transfer are all ruled by the gas distribution. In this investigation, the tracer gas method is used for evaluating the radial gas dispersion coefficient. CO2 is used as a tracer gas, and the experiment is carried out in a bubbling fluidized bed cold model. Ceramic balls are used as the bed material. The effect of gas velocity, radial position and bed height is investigated.
Highlights
Fluidized bed combustion technology is an efficient and ecological way of combusting low quality fuels
The radial gas dispersion coefficient has been evaluated by the steady state tracer gas method
This paper has described how the experimental apparatus for radial gas dispersion coefficient evaluation was designed and how a steady state tracer gas experiment was conducted
Summary
Fluidized bed combustion technology is an efficient and ecological way of combusting low quality fuels. Gas and solid dispersion coefficients in axial and radial direction are used to describe the extent of mixing in the bed. This paper will present an experimental evaluation of the gas dispersion coefficient in radial direction Dgr for a bed of ceramic balls. The most widely used method for dispersion coefficient evaluation is the tracer gas method This method uses a suitable tracer gas, which is injected in a fluidized bed at one point. The step response tracer gas method is suitable for evaluating the axial dispersion coefficient Dga. Some authors have used the tracer gas method with steady state to determine Dgr, the radial dispersion coefficient [3,4,5].
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