Raw coal is burned in furnaces or chain grate boilers. In this work, we studied the chamber combustion mechanism in a chain grate boiler (CGB) with a capacity of 20 t/hr. A mathematical model was built using Computational Fluid Dynamics (CFD). It was found that chamber combustion with swirl burners instead of grate firing has a positive effect on NO emissions. NO emissions dropped from 700 ppm in case 5 to 250 ppm in case 1. The calculated and measured NO emissions agreed well, with a discrepancy of less than 15%, except on plane 2 for four calculated cases. For the temperature field, the discrepancy between the measured and simulated values was below 12% for the four cases. These discrepancies between calculated and measured results are acceptable. This study provides a good idea for the design and reconstruction of CGBs. To reduce NO emissions, the reconstruction method can be used for CGBs instead of the grate firing system.
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The authors are grateful to the Zhang Jiamao coal mine for the financial support and to Sinopec for the technical support of this work.
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Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 4, pp. 103 – 107, July – August, 2017.
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Shi, H., Wang, D. Numerical Simulation of Nitrogen Oxide Emission Characteristics of a Retrofitted Chain Grate Boiler. Chem Technol Fuels Oils 53, 610–620 (2017). https://doi.org/10.1007/s10553-017-0841-3
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DOI: https://doi.org/10.1007/s10553-017-0841-3