Prediction of gas emissions in an internally circulating fluidized bed combustor for treatment of industrial solid wastes

Mukadi, L.; Guy, Christophe; Legros, Robert

doi:10.1016/s0016-2361(99)00251-3

Cited by 34 publications

(27 citation statements)

References 18 publications

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“…The obtained results confirm the opinion that the reaction R3 belongs to the most important reactions affecting NO emission (Chen et al, 2001;Gungor and Eski, 2008;Hayhurst and Lawrence, 1996;Liu and Gibbs, 2002;Mukadi et al, 2000). Such a behavior could be explained by the total carbon content in the fuel blend used in the study.…”

Section: Resultssupporting

confidence: 85%

“…Reactions R3 and R4 and R5 lead to NO reduction (Chen et al, 2001;Liu and Gibbs, 2002;Tsujimura et al, 1983), whereas the reactions R3 and R4 are considered to be the most important reactions of NO reduction, because of their significant impact on NO emissions (Chen et al, 2001;Gungor and Eskin, 2008;Hayhurst and Lawrence, 1996;Liu and Gibbs, 2002;Mukadi et al, 2000). Reactions R6, R7, R8 are also applied in the set of chemical reactions as HCN is a part of fuel-N.…”

Section: Resultsmentioning

confidence: 99%

“…Similar to the earlier work (Krzywański et al, 2013), a system of 44 chemical reactions was considered in the model. Among them are homogeneous and heterogeneous reactions including char and volatile oxidation and formation/destruction of NO and N 2 O, as they were shown to be important during cocombustion process: Chen et al (2001), Desroches-Ducarne et al (1998), Furusawa et al (1982), Furusawa et al (1985), Gungor and Eskin (2008), Hayhurst and Lawrence (1996), Huilin et al (2000), Mukadi et al (2000), Saraiva et al (1993), Tomeczek (1992), Tomeczek and Gardoń (2003), Tsujimura et al (1983), Zhou et al (2011). For the purposes of this work, substantial modifications were made including changes in chemical kinetic equations, to make them capable to consider biomass and coal co-combustion.…”

Section: Reaction Modelmentioning

confidence: 99%

See 2 more Smart Citations

Model Research of Gas Emissions From Lignite and Biomass Co-Combustion in a Large Scale CFB Boiler

Krzywański¹,

Rajczyk²,

Nowak³

2014

Chemical and Process Engineering

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The paper is focused on the idea of a combustion modelling of a large-scale circulating fluidised bed boiler (CFB) during coal and biomass co-combustion. Numerical computation results for three solid biomass fuels co-combustion with lignite are presented in the paper. The results of the calculation showed that in previously established kinetics equations for coal combustion, some reactions had to be modified as the combustion conditions changed with the fuel blend composition. Obtained CO 2 , CO, SO 2 and NO x emissions are located in borders of ± 20% in the relationship to the experimental data. Experimental data was obtained for forest biomass, sunflower husk, willow and lignite cocombustion tests carried out on the atmospheric 261 MWe COMPACT CFB boiler operated in PGE Turow Power Station in Poland. The energy fraction of biomass in fuel blend was: 7% wt , 10% wt and 15% wt . The measured emissions of CO, SO 2 and NO x (i.e. NO + NO 2 ) were also shown in the paper. For all types of biomass added to the fuel blends the emission of the gaseous pollutants was lower than that for coal combustion.

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Section: Reaction Modelmentioning

confidence: 99%

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Model Research of Gas Emissions From Lignite and Biomass Co-Combustion in a Large Scale CFB Boiler

Krzywański¹,

Rajczyk²,

Nowak³

2014

Chemical and Process Engineering

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“…The rest of the nitrogen is left in the char (Char-N). It is well known that those NO x precursors, organic nitrogenated compounds and nitrogen in char may then be emitted as NO x /N 2 O which are pollutants causing photochemical smog, acid rain, the greenhouse effect and ozone depletion after being combusted and gasified [1,2]. As a result, the viability of new thermal utilization technologies of industrial biomass wastes in the future [3], to a large extent, will be determined by their NO x emissions.…”

Section: Introductionmentioning

confidence: 99%

Fuel-N Evolution during the Pyrolysis of Industrial Biomass Wastes with High Nitrogen Content

Chen

Wang

et al. 2012

Energies

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Abstract:In this study, sewage sludge and mycelial waste from antibiotic production were pyrolyzed in a batch scale fixed-bed reactor as examples of two kinds of typical industrial biomass wastes with high nitrogen content. A series of experiments were conducted on the rapid pyrolysis and the slow pyrolysis of these wastes in the temperature range from 500-800 °C to investigate the Fuel-N transformation behavior among pyrolysis products. The results showed that Fuel-N conversion to Char-N intimately depended on the pyrolysis temperature and the yield of Char-N reduced with the increase of the pyrolysis temperature. Under the same pyrolysis conditions, Tar-N production mainly depended on complex properties of the different biomasses, including volatile matter, nitrogen content and biomass functional groups. HCN was the predominant NO x precursor in the rapid pyrolysis of biomass, whereas in the slow pyrolysis of mycelial waste, more NH 3 was produced than HCN due to the additional NH 3 formation through the hydrogenation reaction of Char-N, HCN and H radicals. At the same time, some part of the char was analyzed by Fourier Transform infrared spectroscopy (FTIR) to get more information on the nitrogen functionality changes and the tar was also characterized by Gas Chromatography and Mass Spectrometry (GCMS) to identify typical nitrogenous tar compounds. Finally, the whole nitrogen distribution in products was discussed.

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“…The models predicted the flue gas temperature, the chemical gas species, such as O 2 , CO and CO 2 , and the char concentration distributions in both axial and radial locations along the furnace. Mukadi et al 3 developed a mathematical model of kinetic reactions to predict gas emissions in an internally CFBC for treatment of industrial solid wastes. Liu and Gibbs 4 presented the model applied to a 12 MW th CFB boiler using a typical wood biomass-pinewood chips as a fuel to predict NO and N 2 O emissions.…”

Section: Introductionmentioning

confidence: 99%

Untitled

Ngampradit¹,

Piumsomboon²,

Sajjakulnukit³

2004

ScienceAsia

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A Circulating Fluidized Bed Combustor (CFBC) is a highly efficient combustor. It can handle various types of solid fuels such as coal, biomass or agricultural wastes. Coal and biomass have been used as fuel to generate heat for a boiler in many industries. To predict the proper amount of mixed fuel and to reduce the emission from coal burning, a rigorous mathematical model for the CFBC is needed. This paper describes the CFBC model developed as additional subroutines working with ASPEN PLUS version 11.1. The model was divided into three parts: reaction, hydrodynamic, and gas emission. In the first part, the reactions in the combustor were represented by a Continuous Stirred Tank Reactor (CSTR) module. The module was modified by adding the shrinking core model for calculating the size and the weight fraction of particles in each region. In the second part, the hydrodynamics in CFBC were divided into two regions: a lower region with one interval, and an upper region with three intervals. In each region the characteristics, such as the height of the bed, void, and volume, were calculated and sent to CSTR module for adjusting reaction rates in the regions. In the third part, gas emission models were used to calculate the kinetic rates of NO, N 2 O and the conversion of SO 2 to predict the emission to the environment.

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Prediction of gas emissions in an internally circulating fluidized bed combustor for treatment of industrial solid wastes

Cited by 34 publications

References 18 publications

Model Research of Gas Emissions From Lignite and Biomass Co-Combustion in a Large Scale CFB Boiler

Model Research of Gas Emissions From Lignite and Biomass Co-Combustion in a Large Scale CFB Boiler

Fuel-N Evolution during the Pyrolysis of Industrial Biomass Wastes with High Nitrogen Content

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