Co-combustion of pulverized coal and biomass in fluidized bed of furnace

[+] Author and Article Information
Wladyslaw Mitianiec

Mechanical Faculty Cracow University of Technology Al. Jana Pawla II 37 31-864 Krakow, Poland

1Corresponding author.

ASME doi:10.1115/1.4036958 History: Received December 05, 2016; Revised April 26, 2017


Combustion processes of two fuels: pulverized coal and biomass in furnaces takes place at steady state. Combustion of condensed fuels involves one-way interfacial flux due to phenomena in the condensed phase (evaporation or pyrolysis) and reciprocal ones (heterogeneous combustion and gasification). Many of the species injected in the gas phase are afterwards involved in gas phase combustion. The paper presents results of combustion process of two-phase charge contained coal and wetted biomass, where the carrier was the air with given flow rate. The furnace represents three inlets with assumed inlet flow rate of coal, biomass and air and combustion process takes place in the furnace fluidized space. The simulation of such combustion process was carried out by numerical code of open source CFD program Code_Saturne. For both fuels the moist biomass with following mass contents: C=53%, H=5.8% and O=37.62%, ash=3.6 and mean diameter of molecules equal 0.0008 m and pulverized coal with following mass contents: C=76.65%, H=5.16%, O=9.9%, ash=6.21% and mean molecule diameter 0.000025 m. Devolatilisation process with kinetic reactions was taken into account. Distribution of the main combustion product in furnace space is presented with disappearance of the molecules of fuels. The paper presents theoretical description of the two-phase charge, specification of the thermodynamic state of the charge in inlet boundaries and furnace space and thermal parameters solid fuel molecules obtained from the open source postprocessor ParaView.

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