Improved gasification efficiency in IGCC plants &amp; viscosity reduction of liquid fuels and solid fuel dispersion using liquid and gaseous CO2

Tupsakhare, Swanand S.; Dooher, J.; Modroukas, Dean; Castaldi, Marco J.

doi:10.1016/j.fuel.2019.115848

Cited by 11 publications

(4 citation statements)

References 19 publications

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“…Meanwhile, due to the convenient transportation and high combustion efficiency, CWS was also an optimum substitute for oil, especially in America, Russia, China, India, and Australia . As a uniform solid–liquid system, a typical CWS was usually composed of 55–75% dry coal powder, 25–45% moisture, and 0–1% dispersant. , When the solid content of slurry was increased by 1 wt % for the CWS gasification process, the specific coal consumption and the specific oxygen consumption were reduced by 10.19 kg and 9.11 N m 3 for every 1000 N m 3 syngas production, respectively; meanwhile, the effective syngas content was increased by 0.72 wt %. , As for a factory for methanol production with 600,000 t/a, the operating costs were decreased by 10–15 million per year with 1 point increasing of slurry concentration. The qualified CWS products should maintain a high solid loading and a low apparent viscosity. , The slurry concentration with an apparent viscosity of 1000 mPa s at a shear rate of 100 s –1 was generally regarded as the maximum solid content of CWS in industry. , Therefore, to achieve a highly concentrated CWS with good flowability, it was significant to optimize various parameters, i.e., coal properties, size distribution, and additives, which had a deep influence on the slurry ability. − …”

Section: Introductionmentioning

confidence: 99%

“…5,6 When the solid content of slurry was increased by 1 wt % for the CWS gasification process, the specific coal consumption and the specific oxygen consumption were reduced by 10.19 kg and 9.11 N m 3 for every 1000 N m 3 syngas production, respectively; meanwhile, the effective syngas content was increased by 0.72 wt %. 7,8 As for a factory for methanol production with 600,000 t/a, the operating costs were decreased by 10−15 million per year with 1 point increasing of slurry concentration. The qualified CWS products should maintain a high solid loading and a low apparent viscosity.…”

Section: Introductionmentioning

confidence: 99%

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The Enhancement on Rheology, Flowability, and Stability of Coal Water Slurry Prepared by Multipeak Gradation Technology

Jiang

Zhao

et al. 2021

Energy Fuels

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Multipeaking gradation technology is an essential method for improving the slurry ability of coal particles. In this study, the coarse (150–300 μm), fine (54–74 μm), and micro (1–10 μm) coal particles with different ratios were applied to prepare coal water slurry (CWS). The ratio of coarse, fine, and micro particles in bimodal CWS, interval bimodal CWS, and triple-peak CWS was 60:40:0, 60:0:40, and 60:24:16, respectively. The effects of multipeaking technology on stability, flowability, and rheological behaviors of CWS were investigated systematically. The results indicated that the interval bimodal CWS had the best stability and flowability followed by the triple-peak CWS, and the bimodal CWS was the worst. It was demonstrated that the stability and flowability of CWS were enhanced with the increment of microparticles in slurry. Nevertheless, each slurry’s maximum solid content was 68% for bimodal CWS, 65% for interval bimodal CWS, and 70% for triple-peak CWS. It could be attributed to two effects of microparticles on the apparent viscosity of CWS, i.e., filling particle clearance and binding water. If the effect of filling particle clearance was dominant, then apparent viscosity was decreased, and it was beneficial to prepare CWS with high solid content like triple-peak CWS. However, when the effect of binding water was dominant, apparent viscosity was increased, and it was unfavorable for CWS preparation corresponding to interval bimodal CWS. It was worth noting that microparticles play a double side role in preparing highly concentrated CWS.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Enhancement on Rheology, Flowability, and Stability of Coal Water Slurry Prepared by Multipeak Gradation Technology

Jiang

Zhao

et al. 2021

Energy Fuels

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“…The use of CO 2 as a transport medium for coal particles in the oxygen gasification of coal increased the average degree of fuel conversion [18,19], but the flame stability region narrowed in this case [20]. In an atmosphere of carbon dioxide, oxygen diffusion to the combustion region slowed down, and the concentration of active particles decreased.…”

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confidence: 96%

Influence of the Composition of Solid Fuel on the Equilibrium Characteristics of a Gasification Process in the Mixtures of Oxygen and Carbon Dioxide

Donskoi

2021

Solid Fuel Chem.

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The gasification of solid fuels of different elemental compositions in O2/N2 and O2/CO2 mixtures was studied using equilibrium thermodynamic modeling. The dependences of process characteristics (temperature and the yield of carbon residue) on the composition of gasification agent and the stoichiometric ratio were calculated. The addition of carbon dioxide, on the one hand, promoted the conversion of carbon due to an increase in the concentration of gasifying agents and, on the other hand, decreased the process temperature due to an increase in heat capacity and an endothermic effect of the gasification reaction. The efficiency of using O2/CO2 mixtures for the gasification of fuels increased with the carbon content. The highest chemical efficiency of coke and coal gasification was achieved at an initial CO2 concentration of about 40–60 vol %.

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“…However, the average fuel conversion degree decreases. The authors of [15] experimentally investigated the properties of carbon dioxide suspensions: measurements indicate that the viscosity and surface tension of carbon dioxide suspensions are lower than those of coal-water suspensions, which is why their transport and spraying require lower mechanical costs. They obtained carbon dioxide suspensions with a solid phase fraction of up to 66% of the mass.…”

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A Numerical Study of the Influence of Process Parameters on the Efficiency of Staged Coal Gasification Using Mixtures of Oxygen and Carbon Dioxide

Donskoy

2021

Energy Systems Research

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The paper considers a staged conversion process of pulverized coal fuel in the MHPS-type gasifier, which uses mixtures of oxygen and carbon dioxide as a gasifying agent instead of air. Similar conversion processes can be applied in the process diagrams with the capture and disposal of carbon dioxide. The research tool is a reduced-order mathematical model of coal particles' conversion in a reacting gas flow. Replacement of nitrogen with carbon dioxide leads to significant changes in the gasification process characteristics: the average reaction temperature decreases, but this decrease is partially compensated by an increase in the concentration of gaseous reactants. Thus, the gasification process efficiency and the fuel conversion degree increase. Calculations make it possible to identify a range of parameters with the highest cold gas efficiency values. The influence of oxygen concentration is estimated, the dependence of the fuel conversion degree on the reaction temperature is analyzed.

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Improved gasification efficiency in IGCC plants & viscosity reduction of liquid fuels and solid fuel dispersion using liquid and gaseous CO2

Cited by 11 publications

References 19 publications

The Enhancement on Rheology, Flowability, and Stability of Coal Water Slurry Prepared by Multipeak Gradation Technology

The Enhancement on Rheology, Flowability, and Stability of Coal Water Slurry Prepared by Multipeak Gradation Technology

Influence of the Composition of Solid Fuel on the Equilibrium Characteristics of a Gasification Process in the Mixtures of Oxygen and Carbon Dioxide

A Numerical Study of the Influence of Process Parameters on the Efficiency of Staged Coal Gasification Using Mixtures of Oxygen and Carbon Dioxide

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