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This paper presents the experimental results on the pollutant emission of a 2 MW thermal pilot furnace with the injection of hydrogen enriched gas (HRG) into the primary jet (coal dust and primary air). An experimental method to study the effects of this procedure on the thermal pilot furnace, which was specially designed to burn pulverized solid fuel, was conducted. The hydrogen enriched gas used in the study is dried and was produced by an electrolytic system still under patent by the authors. The primary conclusions from the results are focused on the quick diffusion of hydrogen, unlike oxygen, within the coal particles and that the hydrogen forms stable compounds with the sulfur and other elements the sterile content. A primary chemical analysis of the ash/sludge components is also presented within the paper. [ABSTRACT FROM AUTHOR]

Abstract: The present paper analyzes the nitrogen monoxide generation and reduction during co-combustion of biomass (sawdust) in a power plant fired with pulverized coal. The physical and mathematical models highlight the nitrogen monoxide generation and reduction of its concentration by the air staging and combination of various primary methods. The paper analyzes the influence of the primary air excess coefficient, of the initial diameter of equivalent fuel particles and of the gravimetric participation of the sawdust to the mixture. The internal recirculation of combustion gases at the burning inlet, the recirculation of the combustion gases at the furnace end-part, the value of the air excess coefficient and the introduction time of the secondary air are considered constant. The mathematical model is validated through tests on real pilot installation (2MWt). [Copyright &y& Elsevier]

Abstract: Simultaneous combustion of biomass (wood or straw) with coal represents an alternative energy source with economic potential and smaller pollutant emission. Under the current environmental legislation, biomass is seen as a zero emitter of carbon dioxide emissions. The paper analyses the potential corrosion and the formation of adherent deposits in the coal–biomass co-combustion process at two pilot installations. Three types of experiments with a mixture of coal, straw and wood are conducted. For the slagging phenomena, two installations pilot (grate-fired furnace) were used: one of 55kW thermal power and other of 2MW. As a control sample, different types of steels were used. The results can lead to the implementation of measures to reduce the effects of corrosion. The final aim is to increase the boilers efficiency and life duration. Furthermore, the ash analyses allow their use as fertilizer in agriculture. [Copyright &y& Elsevier]