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Research Papers: Fuel Combustion

Co-Combustion of Pulverized Coal and Biomass in Fluidized Bed of Furnace

[+] Author and Article Information
Mitianiec Wladyslaw

Mechanical Faculty,
Cracow University of Technology,
Al. Jana Pawla II 37,
Krakow 31-864, Poland
e-mail: wmitanie@usk.pk.edu.pl

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received December 5, 2016; final manuscript received April 26, 2017; published online June 27, 2017. Assoc. Editor: Wojciech Stanek.

J. Energy Resour. Technol 139(6), 062204 (Jun 27, 2017) (8 pages) Paper No: JERT-16-1491; 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 take 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 later involved in gas phase combustion. This 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 has 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 computational fluid dynamics (CFD) program code_saturne. For both fuels, the moist biomass with following mass contents: C = 53%, H = 5.8%, O = 37.62%, ash = 3.6, and mean diameter of molecules equal to 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 were used. Devolatilization 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. This 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 of solid fuel molecules obtained from the open source postprocessor paraview.

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Figures

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Fig. 1

View of simulation cylindrical model of boiler with inlets and outlet

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Fig. 2

Overall dimensions of boiler

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Fig. 3

Distribution of temperature inside the furnace

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Fig. 4

Contours of charge velocity in longitudinal section of furnace

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Fig. 5

Contours of mass ratio of carbon dioxide

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Fig. 6

Contours of mass ratio of sulfur dioxide

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Fig. 7

Variation of mole ratio of carbon in biomass and coal along the central axis X

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Fig. 8

Distribution of temperature in the boiler after correction of dimensions

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Fig. 9

Contours of NO after changing of boiler dimensions

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Fig. 10

Contours of SO2 distribution in the modified boiler

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Fig. 11

Disappearance mass rate of biomass

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Fig. 12

Contours of distribution of CO mass ratio in modified furnace

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Fig. 13

Emission of SO2, CO2, and CO along furnace length

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