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The quickest but also the most difficult mean of retrieving information of a combustion process is analysing flame radiation. It directly reflects chemical reactions that take place in the reaction zone. Comparing to chemical analysis of flue gas, optical methods (Docquier & Candel 2002) provide practically undelayed information with good spatial resolution. Combustion of pulverized fuels takes place in a turbulent flow. Local fluctuations of both fuel and gaseous reagents concentrations, as well as temperature occur. It leads to permanent local changes in the combustion process intensity
1 INTRODUCTION
Coal is still one of the main fuels used for both electricity and heat generation. Unfortunately, its combustion increases emissions of volatile pollutants such as Nitric Oxides (NOX) and CO2. For that reason, the European Union has endorsed a firm commitment that EU countries are obliged to reduce greenhouse gases by at least 20% by 2020, comparing to the 1990 level
