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RISS 인기검색어
- 검색키워드
- 저자 : Massoud Massoudi Farid (검색결과 4 건)
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The effect of CO on coal–biomass co-gasification with CO<sub>2</sub>
Massoudi Farid, Massoud,Kang, Myung Soo,Hwang, Jungho Elsevier 2017 Fuel Vol.188 No.-
<P><B>Abstract</B></P> <P>In this study, co-gasification of coal and biomass chars with CO<SUB>2</SUB> in the presence of CO was investigated at three different temperatures: 850, 875, and 900°C. A coal–biomass (bituminous-pineapple sawdust) mixture with a mass ratio of 1:1 was used for devolatilization and co-gasification. Random pore model was employed to determine the kinetic coefficient from experimentally obtained carbon conversion data. The Langmuir–Hinshelwood (L–H) equation, which has been widely used in literatures to describe the relationship between kinetic coefficient of the gasification and partial pressures of reacting gases, effectively represented the inhibition effect of CO on char–CO<SUB>2</SUB> gasification. The kinetic parameters of the L–H equation were acquired from the experimental data. The activation energy (<I>E</I>) and pre-exponential factor (<I>A</I>) of each kinetic parameter of L-H equation were obtained using the Arrhenius equation. CO inhibition effect was more powerful in the Char-CO<SUB>2</SUB> co-gasification of the mixed sample compared to those in the unmixed samples. Further, for each sample, the inhibition effect was stronger at lower temperature owing to a smaller number of active sites.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Coal–biomass blended char was gasified with CO<SUB>2</SUB> in the presence of CO. </LI> <LI> Inhibition effect of CO on char-CO<SUB>2</SUB> gasification was studied. </LI> <LI> Langmuir–Hinshelwood (L-H) equation was used to describe the CO inhibition effect. </LI> <LI> Random pore model was used to interpret the carbon conversion data. </LI> <LI> L–H kinetic parameters were obtained and expressed in an Arrhenius equation form. </LI> </UL> </P>
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Massoud Massoudi Farid,Hyo Jae Jeong,Keun Ho Kim,Jungho Hwang 한국연소학회 2015 KOSCOSYMPOSIUM논문집 Vol.2015 No.5
This study investigates the effects of coal feeders position and coal feeding rate on particle transport hydrodynamics and coal combustion in an industrial scale circulating fluidized bed furnace using Dense Discrete Phase Model (DDPM) of ANSYS FLUENT. Several user defined functions (UDF) were used to extend ANSYS FLUENT original code. Results of two different coal feeders positions and coal feeding rates were displayed and compared with operating data obtained from a 340 MWe CFB boiler located in Yeosu, South Korea.
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Massoudi Farid, Massoud,Hwang, Jungho Elsevier Ltd 2017 Fuel Vol.207 No.-
<P><B>Abstract</B></P> <P>The competition between the H<SUB>2</SUB>O and CO<SUB>2</SUB> for the active sites during gasification remains a controversial issue in the literature. In this study, the competition between the H<SUB>2</SUB>O and CO<SUB>2</SUB> for the active sites during gasification of coal, biomass, and a mixture of coal and biomass using the Langmuir–Hinshelwood (L–H) kinetic parameters obtained in our previous two papers (Massoudi Farid et al., 2016, 2017) was investigated. It was found that the char–H<SUB>2</SUB>O and char–CO<SUB>2</SUB> reactions occurred on separate active sites for all samples. For a constant CO<SUB>2</SUB> concentration, increasing the H<SUB>2</SUB>O concentration caused an increase in the kinetic coefficient. The extent to which the kinetic coefficient increased became less pronounced as the amount of biomass in the co-gasified mixture increased. For a constant H<SUB>2</SUB>O concentration, increasing the CO<SUB>2</SUB> concentration also increased the kinetic coefficient; however, the extent to which the kinetic coefficient increased was greater when the amount of biomass was higher. Additional experiments were conducted to study the effect of the co-existence of H<SUB>2</SUB> and CO on the competition between the char–H<SUB>2</SUB>O and char–CO<SUB>2</SUB> reactions for the active sites. It was found that the char–H<SUB>2</SUB>O and char–CO<SUB>2</SUB> reactions also occurred on separate active sites, even in the presence of both H<SUB>2</SUB> and CO.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Coal–biomass blended char was gasified in a mixture of CO<SUB>2</SUB>, H<SUB>2</SUB>O, H<SUB>2</SUB>, and CO. </LI> <LI> Char–H<SUB>2</SUB>O and char–CO<SUB>2</SUB> reactions occurred on separate active sites. </LI> <LI> H<SUB>2</SUB> and CO had no effect on participation of active sites in the gasification. </LI> </UL> </P>
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Kang, Myung Soo,Jeong, Hyo Jae,Massoudi Farid, Massoud,Hwang, Jungho Elsevier 2017 Fuel Vol.210 No.-
<P><B>Abstract</B></P> <P>Staged combustion induces the reduction of NO to generate N<SUB>2</SUB> through the formation of a fuel-rich zone upstream of the flue gas and utilizes the unburned gas by supplying sufficient air for combustion downstream of the flue gas. Since power generation schedules are very constrained and only specific and limited tests can be planned and executed, the use of numerical simulations is currently more suitable for analyzing these large and complex systems. In this study, computational fluid dynamics (CFD) simulation was performed for an industrial-scale fuel oil combustor to determine the effect of staged combustion on NOx emissions. The fuel oil combustor is a 400-MWe opposite-wall unit located in Ulsan, South Korea, where high-sulfur fuel oil (Bunker-C with 2.5% sulfur content) is used. The combustor has a height of 56m and a cross-sectional area of 10×12m<SUP>2</SUP>. Water wall tubes (evaporator) are located on the wall of the lower part of the combustor and sixteen burners are located at four different axial positions. The system is comprised of two superheaters, two reheaters, and an economizer located in the upper part of the combustor. Staged combustion is realized by changing the equivalence ratio of each burner. Under the initial staged combustion conditions adopted by the Ulsan power plant, the concentration of NOx at the exit of the combustor was calculated to be 362ppm, which was still high even after selective catalytic reduction treatment. However, when more stringent staged combustion conditions were applied, the predicted concentration of NOx decreased to 309ppm, which is lower than the mandated NOx concentration at the combustor exit.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CFD simulation was carried out for an industrial-scale fuel oil combustor. </LI> <LI> Ideal operating conditions were determined by using stringent staged combustion. </LI> <LI> NOx emission decreased with proposed conditions compared to reference conditions. </LI> <LI> The decrease of NOx emissions was mainly caused by thermal NOx formation decrease. </LI> <LI> The theoretical CFD results were in good agreement with experimental data. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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