Abstract

In this paper results of research of co-firing coals from Middle Bosnian basin with waste woody biomass are presented. The research was conducted in the laboratory at the Faculty of Mechanical Engineering in Sarajevo. Tested fuels were subjected to pulverized combustion under various temperatures and various technical and technological conditions: different mass ratio of fuel components in the mixture, different coefficient of excess air for combustion, classic and staged air supply, and fuel staged into the reaction zone. The results are related to the emission of flue gas components with respect to the technological conditions of combustion. In addition to the valorization of the influence of the primary fuel composition and process temperature on the emission values of the flue gas components, it has been shown that the application of primary measures in the combustion chamber results in lower or higher positive effects in terms of reducing the emissions of individual components -e.g. the NOx emission is reduced from 837 mg/mn3 in conventional combustion to 710 mg/mn3 using air staging, while during combustion with fuel staging, the NOx emission is reduced in proportion to the part of the fuel that is introduced into the reaction zone subsequently.

Highlights

  • There are significant coal deposits and reserves in Bosnia and Herzegovina

  • The average NOx emission difference depending on the mode of supply of combustion air is 250 mg/mn3: in the case of conventional air supply, the average NOx emission is 942 mg/mn3, while in the case of a stage combustion air supply, the emission is 692 mg/mn3, Figure 2

  • Based on the results of the research, the following conclusions can be drawn regarding the impact of various factors on the emission of flue gas components in the co-firing of coal with waste woody biomass during air staging:

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Summary

Introduction

There are significant coal deposits and reserves in Bosnia and Herzegovina. The conversion of primary energy from this fossil fuel in thermal power plants produces about 75% of total electricity production.

Results
Conclusion
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