Modelling of swirling pulverized-coal flames in an axi-symmetric furnace
- Risoe National Lab., Roskilde (Denmark). Dept. of Combustion Research
- Aalborg Univ., Aalborg Oest (Denmark). Inst. for Energy Technology
In a previous project swirl stabilized pulverized-coal flames were investigated experimentally in Risoe National Laboratory`s 1.3 MW tunnel furnace. Different flame types were obtained by varying the swirl number and the position of the movable coal lance. By means of laser techniques as well as conventional methods a comprehensive set of data was obtained. The resulting detailed mapping of local gas velocity, temperature and composition including inlet profiles are well suited for the assessment and verification of numerical simulation models. In the work described in the present paper three of the pulverized-coal flames measured during the above mentioned project have been modeled by means of the computational fluid dynamics code FLOW3D release 3.2 developed by Harwell Laboratory. Observations and conclusions are presented regarding the performance of mathematical models and numerical methods employed in the code and the calculated results are compared to the measurements. It is concluded that: (1) the {kappa}-{epsilon} turbulence model is not capable of resolving the flow pattern in the near-burner region in the more complex situations which result when the coal lance is inserted into the quarl and the swirl number is high; (2) the flow pattern of the type 2 flame with no insertion of the coal lance and a low swirl number is predicted very well; and (3) the predicted gas temperatures in the furnace room are acceptable.
- OSTI ID:
- 257205
- Report Number(s):
- CONF-950952--
- Country of Publication:
- United States
- Language:
- English
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