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Savremena poljoprivredna tehnika
2010, vol. 36, iss. 4, pp. 344-356
article language: Serbian
document type: Original Paper
published on: 28/12/2010
Excess air rate during the straw bale combustion and review of mathematical models
aUniversity of Novi Sad, Faculty of Agriculture
bGrad Novi Sad, Novi Sad

e-mail: dedovicn@gmail.com

Abstract

The paper reviews test results for a biomass-fired hot water boiler, located at 'Mitrosrem' agricultural company from Sremska Mitrovica, work unit Kuzmin. Nominal boiler power is 120 kW. Wheat and soya straw bales were used as fuel. The impact of the quantity of inlet air (150, 220, 290, 360 and 430 m3/h) fed to the boiler firebox was continuously monitored. We examined correlation between boiler thermal power, energy efficiency rate and bale incineration time, as well as the mass decrease during the bale incineration and we proposed the corresponding mathematical models. In the case of no combustion products recirculation, average boiler thermal power rate ranges from 63.47 to 90.90 kW for wheat straw (from 75.66 to 113.12 kW for soya straw). Maximum boiler thermal power is 130.94 kW for wheat straw (141.56 kW for soya straw). The increase of air throughput in the firebox, increases the thermal capacity of the boiler, while the bale incineration time is reduced. Total incineration time ranges between 587 and 1,175 for wheat straw (from 400 to 900 s for soya straw). The boiler thermal power is greater if one uses soya straw bales as a fuel. The excess air rate values are given for maximum boiler thermal power and maximum boiler energy efficiency rate. Excess air rate values are between 0.4 and 8.4 (for wheat straw bale comb6ustion), and from 0.4 to 6.3 (for soya straw bale combustion).

Keywords

References

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