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Numerical study of NOx reduction by reburning mechanically-activated micronized coal in a full-scale tangentially-fired boiler

M. Chernetskiy
Kutateladze Institute of Thermophysics, SB RAS, Novosibirsk, Russia; Siberian Federal University, Krasnoyarsk, Russia

A. A. Dekterev
Institute of Thermophysics of SB RAS, Krasnoyarsk branch, 50/44 Akademgorodok, ICM SB RAS, TORINS, Krasnoyarsk, 660036; Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, 1 Akad. Lavrentiev Ave., Novosibirsk, 630090

K. Hanjalic
Department of Multi-scale Physics, Faculty of Applied Sciences, Delft University of Technology, The Netherlands and Novosibirsk State University, Russia

要約

The paper presents some results of numerical simulation of the effects of reburning of mechanicallyactivated micronized coal on NOx reduction in a tangentially fired boiler of 500 t/h steam production. The conventional RANS approach was used to compute two-phase (reactive dispersed particles in gaseous medium) multi-component system, with some modifications of models of particle heat transfer and their reactions. The comprehensive model was earlier verified in simulation of an 5 MW experimental combustor as well as in a full-scale real boiler. The comparison with the standard firing with pulverized coal showed that reburning of non-activated fine coal leads to a NOx reduction by about 20%, but increases the unburnt carbon residual by 23%. However, reburning of mechanically-activated coal of the same granulation reduces NOx by 30% and also diminishes the unburnt residual by 35%, demonstrating that reburning in general, but especially of activated micronized coal, is a feasible option for achieving significant reduction in NOx emission.

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