NOx EMISSIONS FROM BUBBLING FLUIDIZED BED COMBUSTION OF LIGNITE COAL

Authors

  • Pavel Skopec Czech Technical Univerzity in Prague
  • Jan Hrdlička Czech Technical Univerzity in Prague
  • Jan Opatřil Czech Technical Univerzity in Prague
  • Jiří Štefanica Czech Technical Univerzity in Prague

DOI:

https://doi.org/10.14311/AP.2015.55.0275

Keywords:

NOx emissions, coal combustion, fluidized bed

Abstract

This paper presents experimental results of NOx emission measurements for combustion of two kinds of coal in a bubbling fluidized bed combustor. The tested fuels were Czech brown coal (CBC) and German young brown coal (GYC). These fuels have different nitrogen contents. The experiments were performed in the pilot scale BFB experimental unit with power output of 500 kW. The influence of several parameters on NOx formation are investigated in this paper. The parameters studied here include the effect of the nitrogen content in the fuel, the effect of the oxygen concentration in the bed, the effect of bed temperature, the effect of air staging, and the effect of fluidization velocity. Significantly different behaviour of the fuels was found. Although GYC has a lower nitrogen content than CBC, it is more reactive and produces higher NOx emissions. The biggest dependence of NOx production for CBC was found for the effects of air staging and fluidization velocity. As the fluidization velocity increases and the amount of secondary air decreases, there is an increase in NOx emissions. The oxygen concentration in the bed has the strongest effect on the NOx production of GYCs. With increasing oxygen concentration, the production of NOx also increases. On the basis of the NOx measurements, the N-NO conversion factor was calculated and the effect of the operating parameters on this conversion factor was investigated.

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Author Biographies

Pavel Skopec, Czech Technical Univerzity in Prague

Faculty of Mechanical Engineering, Department of Energy Engineering

Jan Hrdlička, Czech Technical Univerzity in Prague

Faculty of Mechanical Engineering, Department of Energy Engineering

Jan Opatřil, Czech Technical Univerzity in Prague

Faculty of Mechanical Engineering, Department of Energy Engineering

Jiří Štefanica, Czech Technical Univerzity in Prague

Faculty of Mechanical Engineering, Department of Energy Engineering

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Published

2015-08-31

How to Cite

Skopec, P., Hrdlička, J., Opatřil, J., & Štefanica, J. (2015). NOx EMISSIONS FROM BUBBLING FLUIDIZED BED COMBUSTION OF LIGNITE COAL. Acta Polytechnica, 55(4), 275–281. https://doi.org/10.14311/AP.2015.55.0275

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Section

Articles