Numerical study of NOx reduction by reburning mechanically-activated micronized coal in a full-scale tangentially-fired boiler : доклад, тезисы доклада

Тип публикации: доклад, тезисы доклада, статья из сборника материалов конференций

Конференция: 8th International Symposium on Turbulence, Heat and Mass Transfer, THMT 2015; Sarajevo; Sarajevo

Год издания: 2015

Аннотация: 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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Издание

Журнал: Proceedings of the International Symposium on Turbulence, Heat and Mass Transfer

Номера страниц: 779-782

Издатель: Begell House Inc.

Авторы

  • Chernetskiy M. (Siberian Federal University)
  • Dekterev A. (Siberian Federal University)
  • Hanjalić K. (Delft University of Technology,Chem. Eng. Dept.)

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