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Modelling of pollutants concentrations from the biomass combustion process

Magdziarz A., Wilk M., Zajemska M.

Chemical and Process Engineering

2011

Vol. 32, nr 4

423-433

This paper presents possibilities for of numerical modelling of biomass combustion in a commercially available boiler. A sample of biomass was tested with respect to its physical and chemical properties. Thermogravimetry studies of biomass were carried out. Computer simulation makes it possible to analyse complex phenomena which are otherwise difficult to observe. The aim of this work was to model biomass combustion to predict the amount of pollutants generated (NOx, CO, SO2) in the exhaust gases coming out from boilers The calculations were made using the CHEMKIN program. Results of calculations were performed taking into account the influence of temperature, pressure and residence time.

Mathematical modelling of biomass combustion process on mechanical stoker

Nadziakiewicz J., Czekalski R.

Archiwum Gospodarki Odpadami i Ochrony Środowiska

2006

Vol. 4

93-106

The paper presents model of biomass combustion process on a mechanical stoker. Continuous two-dimensional process (which is simplification of real, three-dimensional one) was substituted with one-dimensional unsteady process of combustion of separated bed segment. The model considers drying, devolatilization, combustion of particles and reactions in gaseous phase. Results of the computation process are changes of temperatures of solid and gaseous phase, as well as gas composition in time, which corresponds to the values of those parameters in different places on mechanical stoker. The further part of investigation are laboratory measurements of the process.

Artykuł prezentuje model procesu spalania warstwy biomasy na ruszcie mechanicznym. Ustalony proces dwuwymiarowy spalania warstwy na ruchomym ruszcie (będący uproszczeniem rzeczywistego procesu) został zastąpiony jednowymiarowym nieustalonym procesem spalania fragmentu warstwy. W modelowaniu uwzględniono suszenie, odgazowanie i spalanie ziaren a także reakcje w fazie gazowej. Rezultatem obliczeń modelu są zmiany temperatur fazy stałej i gazowej oraz składu gazu w czasie, co odpowiada kolejnym położeniu badanego fragmentu na ruszcie rzeczywistym. Planowanym dalszym etapem badań jest przeprowadzenie pomiarów w skali laboratoryjnej.