Investigation of air-blown two-stage entrained-flow gasification of micronized coal

Abaimov, N. A.; Butakov, E. B.; Burdukov, A. P.; Osipov, P. V.; Рыжков, А. Ф.

doi:10.1016/j.fuel.2020.117487

Cited by 12 publications

(6 citation statements)

References 26 publications

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“…Experimental data on steam-air gasification were obtained at the installation of the Institute of Thermophysics of the Siberian Branch of the Russian Academy of Sciences (IT SB RAS), the operation of which in other conversion modes is described in detail in (Abaimov et al , 2017Chernetskiy et al 2014;Shadrin et al 2021;Butakov et al 2022;Abaimov et al 2020). This design ensures two-stage coal conversion.…”

Section: Methodsmentioning

confidence: 99%

“…The CFD model of solid fuel entrained-flow conversion, proposed in (Abaimov et al , 2017(Abaimov et al , 2020, was applied. Modelling was carried out on a mesh with 550,000 calculated elements.…”

Section: Cfd Modelmentioning

confidence: 99%

“…Coal is less reactive fuel than fuel oil and gas, so its reactivity has to be increased in various ways. The most common methods are the mechanical activation (micronization) of coal (Burdukov et al 2020) and the use of plasmatron (Messerle et al 2019).…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of the autothermal steam-air-blown gasification of a low-grade fuel in non-stationary regimes

Abaimov,

Ryzhkov,

Alekseenko

et al. 2023

Preprint

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A numerical investigation of the initial stage of the non-stationary autothermal conversion of low-grade micronized coal with cold air and steam supplied separately to an entrained-flow setup with a capacity of 0.1 MW was carried out. The syngas composition CFD model and the nonlinear dynamics of temperature change over time were numerically validated. The CFD study showed that in partial gasification mode, the degree of carbon conversion in the setup was 24–26%, H2/CO = 0.29–0.43, which corresponds to work in the primary furnace mode. Increasing the H2/CO ratio by 1.5 times significantly reduces emissions of nitrogen oxides from the gasifier and the GTU combustion chamber. CFD simulation shows that the non-stationary conversion process generally proceeds in three stages, the localization of which depends on the input parameters and design parameters. The introduction of a weakly superheated axial steam jet creates asymmetric hydrodynamic, structural, chemical and temperature inhomogeneities in the second stage. The CFD calculations made it possible to determine the sensitivity of conversion rates for the setup’s operating parameters and design.

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Section: Methodsmentioning

confidence: 99%

Section: Cfd Modelmentioning

confidence: 99%

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Numerical investigation of the autothermal steam-air-blown gasification of a low-grade fuel in non-stationary regimes

Abaimov,

Ryzhkov,

Alekseenko

et al. 2023

Preprint

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“…The quality of the gas is significantly affected by the gasification technology used and the conditions in the gasifier. Moving bed gasifiers [8], fluidized bed gasifiers [9] and entrained flow gasifiers [10] commercialized and used in coal gasification have been employed also in the gasification of biomass and waste [11,12]. Although large industrialscale gasification is usually carried out in continuous mode, many small or pilot scale gasifiers were designed for batch or semi-batch modes.…”

Section: Introductionmentioning

confidence: 99%

Semi-Batch Gasification of Refuse-Derived Fuel (RDF)

2021

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Gasification is a promising technology for the conversion of mixed solid waste like refuse-derived fuel (RDF) and municipal solid waste (MSW) into a valuable gas consisting of H2, CO, CH4 and CO2. This work aims to identify the basic challenges of a single-stage batch gasification system related to tar and wax content in the producer gas. RDF was first gasified in a simple semi-batch laboratory-scale gasification reactor. A significant yield of tars and waxes was received in the produced gas. Waxes were analyzed using gas chromatography-mass spectrometry (GC-MS) and nuclear magnetic resonance (NMR) spectrometry. These analyses indicated the presence of polyethylene and polypropylene chains. The maximum content of H2 and CO was measured 500 seconds after the start of the process. In a second series of experiments, a secondary catalytic stage with an Ni-doped clay catalyst was installed. In the two-stage catalytic process, no waxes were captured in isopropanol and the total tar content decreased by approximately 90 %. A single one-stage semi-batch gasification system is not suitable for RDF gasification; a large fraction of tar and waxes can be generated which can cause fouling in downstream processes. A secondary catalytic stage can significantly reduce the tar content in gas.

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“…The dry warm temperature desulfurization of coal-derived fuel gas offers significant improvements in the thermal efficiency of emerging technologies using coal gasification such as integrated gasification-combined cycle power generation employing gas turbines. − For these technologies, highly efficient sulfur removal is required, from several thousand parts per million (ppm) down to 1 ppm for fuel cell power plants, or 100 ppm for gas turbines. Despite the long development history of dry warm gas desulfurization technology, , the first commercial IGCC (integrated gasification-combined cycle) unit started operating only in recent years , at Polk Power Station, Florida, USA.…”

Section: Introductionmentioning

confidence: 99%

Multiple Gas–Solid Reactions in a Porous Sorbent Applied to Warm Gas Desulfurization

Kagramanov

Tuponogov

Рыжков

et al. 2020

Ind. Eng. Chem. Res.

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In this work, a mathematical model of multiple gas–solid reactions in a porous sorbent has been applied to simulate warm gas desulfurization. The model has been formulated by incorporating the intrinsic kinetics of the individual reactions obtained from separate experiments. The model output has been compared to the experimental results of zinc oxide sulfidization and reduction by hydrogen and carbon monoxide. The microstructure of subgrains was simplified to reduce computational costs. The model predictions were in good agreement with experimental measurements of the overall rate of reaction and the degree of sulfur fixation over a wide range of experimental conditions. The mathematical model successfully predicted the performance of a porous sorbent in a thermogravimetric analysis reactor. We demonstrated numerically that hydrogen is more harmful to zinc oxide-based sorbents than carbon monoxide, implying that a shift reactor would be best located downstream, rather than upstream from a warm gas-cleaning process.

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Investigation of air-blown two-stage entrained-flow gasification of micronized coal

Cited by 12 publications

References 26 publications

Numerical investigation of the autothermal steam-air-blown gasification of a low-grade fuel in non-stationary regimes

Numerical investigation of the autothermal steam-air-blown gasification of a low-grade fuel in non-stationary regimes

Semi-Batch Gasification of Refuse-Derived Fuel (RDF)

Multiple Gas–Solid Reactions in a Porous Sorbent Applied to Warm Gas Desulfurization

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