Numerical and experimental study of heavy oil gasification in an entrained-flow reactor and the impact of the burner concept

Bader, A.; Hartwich, Mathias; Richter, Andreas; Meyer, Bernd

doi:10.1016/j.fuproc.2017.09.003

Cited by 36 publications

(13 citation statements)

References 44 publications

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“…Bader et al 105 used 2D axisymmetric RANS calculations with the CPD model and a simpler element-based pyrolysis model to describe gasification in a laboratory gasifier, with good success. The validated element-based pyrolysis model was then used to model heavy oil gasification in the same gasifier.…”

Section: Energy and Fuelsmentioning

confidence: 99%

Review of 30 Years of Research Using the Chemical Percolation Devolatilization Model

Fletcher

2019

Energy Fuels

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The chemical percolation devolatilization (CPD) model for coal pyrolysis was first published in 1989, and a completed version that included the vapor–liquid equilibrium model and cross-linking model was published in 1992. The CPD model was one of three pyrolysis models developed using a lattice model to account for the chemical structure of the coal and was directly based on solid-state 13C nuclear magnetic resonance (NMR) measurements of the coal structure. A correlation of coal structure parameters measured by NMR spectroscopy was performed to permit use of the CPD model to determine pyrolysis rates and yields of tars and light gases for any coal type. A separate nitrogen release model was also developed on the basis of the chemical structure. In the past 30 years, the CPD model or the concepts in the CPD model have been used to describe pyrolysis in many situations for many fuels. The CPD model has been incorporated directly into simulations of large coal combustors as well as detailed simulations of single-pyrolyzing or burning coal particles, which was the original intent. Some investigators added a more rigorous treatment of light gas release. Other investigators have used the CPD model to determine rate coefficients for simpler models for a given range of heating conditions. In addition, the concepts in the CPD model have been used to develop models for other solid fuels, including biomass, black liquor, oil shale, rigid foams, propellants, heavy oil, asphalt, and scrap tires. The CPD model has also been extended to low heating rates for underground coal thermal treatment and hydropyrolysis. This paper is a review of the development, improvement, and uses of the CPD model, along with extended uses of the concepts in the CPD model.

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Section: Energy and Fuelsmentioning

confidence: 99%

Review of 30 Years of Research Using the Chemical Percolation Devolatilization Model

Fletcher

2019

Energy Fuels

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“…The process is assumed to be conducted at two consecutive steps: (i) fast pyrolysis and (ii) gasification. Devolatization takes place for the mixed VGO/glucose where most of the volatile matter as well as the moisture content are removed to form solid char from the remaining matter [63] . The gasification step of the remaining char is modelled with a random pore model as done with the conventional cases co‐gasification biomass with solid feedstocks, such as coal, [16,21,42,64] petcoke [65] .…”

Section: Resultsmentioning

confidence: 99%

Apparent Kinetics of Co‐Gasification of Biomass and Vacuum Gas Oil (VGO)

Al‐Attas

Lucky

Hossain

2021

Chemistry An Asian Journal

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This communication reports the beneficial effects of co‐gasification of biomass and residual oil to produce syngas. In this regard, various blends of glucose (a biomass surrogate) to vacuum gas oil (VGO) have been employed to investigate the synergic effects on the gasification process. The non‐isothermal co‐gasification experiments were conducted in a thermogravimetric analyzer at different heating rates and gasifying agents. The analysis showed that the co‐gasification rate increased with the increase of glucose content in the feedstock. The presence of the oxygen in the biomass molecules helped the overall gasification process. The maximum gasification rate of 42.70 wt/min (DTGmax) was observed with 25 wt% glucose containing sample. The use of gasifying agents appeared to have some influence, especially during high temperature gasification of the glucose‐VGO blends. At a same gasification temperature, the co‐gasification rate of glucose‐VGO blends were found to be 125.7 wt/min and 98.59 wt%/min for N2 and CO2, respectively. The kinetics of the co‐gasification of glucose‐VGO blends was conducted based on modified random pore model using TGA experimental data and implemented in MATLAB. The estimated activation energy and rate constants were found to be consistent to the observed co‐gasification rates. The apparent activation energies of co‐gasification of VGO/biomass blends with different weight percentages shows values ranging 60.56–48.25 kJ/mol. The kinetics analysis suggested that the addition of biomass helped to increase the reaction rate by lowering the activation energy required for accomplishing the reactions compared with petroleum carbonaceous feedstocks. The reaction rate constants isotherms are plotted to show that the k‐values are exhibiting similar trends at moderate heating rates between 20 and 60 °C/min. This remark arises due to the nature of the reactions involved which are considered to be inherently similar in this range of heating rate.

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“…The char will quickly react with oxygen for combustion and gasification with H2O, CO2, H2, etc. Since the chemical reaction rate of char and H2 is relatively small, the reaction of char with H2 is ignored in the simulation [20]. This paper only considers the heterogeneous reaction of char with O2, H2O, and CO2.…”

Section: Principle Of Heterogeneous Char Reactionsmentioning

confidence: 99%

Numerical simulation of entrained flow gasification based on properties and kinetic characteristics of pulverized coal particles

Jiang

Zhou

et al. 2022

J. Phys.: Conf. Ser.

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Gasification kinetic parameters of coal char based on the random pore (RPM) model are obtained with CO2 and H2O using a high-pressure thermogravimetry analysis (TGA) under atmospheric pressure and 4.0 MPa pressure, considering the influence of internal diffusion and particle structure varying with carbon conversion. The Chemical Percolation Devolatilization (CPD) model is used to modify the actual volatile content. Through the coupling of the gasification kinetic reaction model, a comprehensive numerical simulation method of the entrained flow gasification process is established. This method is used to simulate the typical gasifier of HTL (a gasification technology of Changzheng Engineering Co.) in an industrial plant. The research shows that the intrinsic reaction parameters obtained by TGA under high pressure can give a more reasonable reaction state of coal char particles in the gasifier than that measured under atmospheric pressure, and the simulation results are in good agreement with the industrial data. In addition, HTL adopts a single top-fired burner and multi-channel swirling feed type. The particles are entrained and mixed with swirling oxygen, and the combustion reaction is completed quickly in the upper part of the gasifier. In contrast, the gasification reactions are relatively slow and mostly dominate in the recirculation zone and pipe flow zone, leading to high carbon conversion.

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Numerical and experimental study of heavy oil gasification in an entrained-flow reactor and the impact of the burner concept

Cited by 36 publications

References 44 publications

Review of 30 Years of Research Using the Chemical Percolation Devolatilization Model

Review of 30 Years of Research Using the Chemical Percolation Devolatilization Model

Apparent Kinetics of Co‐Gasification of Biomass and Vacuum Gas Oil (VGO)

Numerical simulation of entrained flow gasification based on properties and kinetic characteristics of pulverized coal particles

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