Predictive model for countercurrent coal gasifiers

Grieco, Enrico Maria; Baldi, Giancarlo

doi:10.1016/j.ces.2011.06.072

Cited by 13 publications

(12 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The CPD model was used in simulations of a countercurrent fixed bed gasifier by Grieco and Baldi. 106 Results using the CPD model were poor, likely as a result of the low heating rate, redeposition, and cross-linking that occurs in a fixed-bed gasifier. The Merrick model 107 seemed to give better results for this application.…”

Section: Energy and Fuelsmentioning

confidence: 99%

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

Fletcher

2019

Energy Fuels

View full text Add to dashboard Cite

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.

show abstract

Section: Energy and Fuelsmentioning

confidence: 99%

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

Fletcher

2019

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…The operating conditions and the main input parameters for model simulations are summarized in Table . These conditions refer to the lab-scale gasifier reported in ref and a sample of the experimental data obtained in the Sotacarbo pilot plant. Before comparison of model predictions to experimental data, it is convenient to analyze and assess some model features particularly with respect to the spatial discretization and the dynamic behavior to reach the steady-state conditions, referring to the Grieco and Baldi gasifier …”

Section: Model Predictions and Comparisons To Experimental Datamentioning

confidence: 99%

“…(a) Schematic of chemical phenomena occurring within the updraft gasifier, (b) mass flow rate of key gas components, (c) residual solid composition, and (d) thermal profiles along the gasifier axial length (Grieco and Baldi case study).…”

Section: Model Predictions and Comparisons To Experimental Datamentioning

confidence: 99%

“…The mathematical model of the updraft gasifier is used to perform a careful sensitivity analysis to key operating parameters, such as oxygen/fuel and steam/fuel ratios, inlet gas temperature, and composition. Some preliminary comparisons of model predictions to literature experimental data are also proposed to further validate the model reliability . Moreover, experimental data from the Sotacarbo pilot plant, located in Sardinia, Italy, constitute a further test case for this multi-scale kinetic and reactor model.…”

Section: Introductionmentioning

confidence: 96%

See 1 more Smart Citation

Multi-scale Kinetic Modeling and Experimental Investigation of Syngas Production from Coal Gasification in Updraft Gasifiers

et al. 2015

View full text Add to dashboard Cite

Gasification is a thermochemical process devoted to the production of syngas, starting from a solid fuel such as coal, biomass, or refuse-derived fuel (RDF). The gasification efficiency and the chemical composition of the produced syngas are strongly affected by the feedstock and the operating conditions of the process. Besides the direct use as a fuel for power generation, downstream applications of syngas for chemical production demand specific H 2 /CO ratios, as extensively reported in the literature. For this reason, in the present work, a comprehensive mechanistic approach is applied to the description of the coal gasification process, highlighting the sensitivity of key operating parameters on syngas quality. The solution of this multi-scale, multi-phase, and multi-component problem requires careful attention to the kinetics in the solid and the gas phase as well as the heterogeneous gas−solid reactions. The kinetic model is validated with experimental data obtained in updraft gasifiers (including the Sotacarbo pilot gasification plant), and the catalytic effects of ash on the reactivity of low-rank coals are also addressed and quantified.

show abstract

“…Grieco and Baldi described a model to calculate axial profiles of temperature and composition along an up‐draft coal gasifier. With respect to other models published in the literature, this model has two main advantages: pyrolysis was modelled by taking into account thermal gradients inside the particles and conservation equations were solved by means of a stable and well conditioned numeric method.…”

Section: Mathematical Modellingmentioning

confidence: 99%

Petroleum coke gasification: A review

et al. 2013

View full text Add to dashboard Cite

The production of petroleum coke (petcoke) in the refineries is progressively peaking up because of the trend of processing heavy crudes and in turn, a renewed interest in delayed coking process. Therefore, an efficient, economical, and environmentally safe utilisation of petcoke has become imperative in the current petroleum refining scenario. Gasification of petcoke has emerged as one of the attractive options and is gaining increasing attention to convert the petcoke to value‐added products. The process offers the refiners a variety of product slates mainly via synthesis gas route. The products include steam, hydrogen, electricity, chemicals (viz. methanol, ammonia, etc.), liquid fuels via Fischer–Tropsch (F‐T) synthesis and so on. Petcoke has been identified as a potential feedstock for about 15% of the total planned gasification capacity worldwide. In the present communication, the published literature pertaining to petcoke gasification has been extensively analysed and a state‐of‐the‐art review has been written that includes: (1) the importance of petcoke gasification in the present petroleum refining scenario; (2) petcoke gasification reaction mechanism, kinetics, and typical product profile; (3) parametric sensitivity of the operating variables such as temperature and pressure; (4) various gasifiers for petcoke gasification; (5) modelling efforts on different types of gasifiers and (6) future prospects of petcoke gasification. An attempt has been made to get the afore‐mentioned aspects together in a thematic framework so that the information is available at a glance and is expected to be useful as a single point source to the researchers and practicing refiners.

show abstract

Predictive model for countercurrent coal gasifiers

Cited by 13 publications

References 24 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

Multi-scale Kinetic Modeling and Experimental Investigation of Syngas Production from Coal Gasification in Updraft Gasifiers

Petroleum coke gasification: A review

Contact Info

Product

Resources

About