Modeling and simulation of coal gasification on an entrained flow coal gasifier

Improved understanding of coal gasification chemical kinetics is needed to increase thermodynamic efficiency and to reduce undesirable CO2 emissions. This work describes an optically-accessible entrained-flow coal gasifier designed and built to allow measurements of the major species at various stages of the chemical reactions. The 2-meter tall gasifier consists of five subsystems: the optical diagnostics, steam generator, coal feeder, external heaters, and gas sampling and analysis. A stoichiometric H2-O2 flame generates superheated steam, the gasifying agent, which reacts with pulverized coal fed from a variable feed-rate pressurized powder feeder. To sustain the endothermic coal gasification reaction, radiant heaters provide 15 kW of external heating. Diagnostics to determine the major species concentrations consist of tunable diode laser absorption spectroscopy (TDLAS) measurements within the reactor vessel assembly and analysis of dry product gases using a gas chromatograph.

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Development of a 2T/D pressurized two-stage entrained flow coal gasifier. 1st, Report, Characteristics of coal gasification.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B ◽

10.1299/kikaib.57.790 ◽

1991 ◽

Vol 57 (535) ◽

pp. 790-795 ◽

Cited By ~ 2

Author(s):

Jun INUMARU ◽

Saburo HARA ◽

Masami ASHIZAWA ◽

Yuichi KOBAYASHI ◽

Teruhide HAMAMATSU ◽

...

Keyword(s):

Coal Gasification ◽

Two Stage ◽

Entrained Flow ◽

Coal Gasifier

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Numerical Study on Coal Gasification in Texaco Entrained-Flow Coal Gasifier

2009 Asia-Pacific Power and Energy Engineering Conference ◽

10.1109/appeec.2009.4918551 ◽

2009 ◽

Author(s):

Min Du ◽

Yingli Hao ◽

Sheng Liu

Keyword(s):

Coal Gasification ◽

Numerical Study ◽

Entrained Flow ◽

Coal Gasifier

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Numerical Simulation of Coal Ash Particle Behavior in Entrained Flow Coal Gasifier

Volume 1: Fora, Parts A, B, C, and D ◽

10.1115/fedsm2003-45744 ◽

2003 ◽

Author(s):

Hiroaki Watanabe ◽

Kazuyoshi Ichikawa ◽

Maromu Otaka ◽

Jun Inumaru

Keyword(s):

Numerical Simulation ◽

Gas Phase ◽

Coal Gasification ◽

Current Model ◽

Electric Power Industry ◽

Central Research ◽

Ash Deposition ◽

Entrained Flow ◽

Coal Gasifier ◽

Coal Particles

The objective of this study is to develop an evaluation tool for a design and performance of a coal gasifier by a numerical simulation technique. In the present paper, a gas-particle two phase reacting flow calculation is carried out for a prediction of phenomena in an entrained flow coal gasifier due to coal and ash particles behavior, such as ash deposition on the wall. A transportation of the coal particles is modeled via a Lagrangian manner. The ash particle adhesion on the wall of the gasifier is discriminated by an empirical ash adhesion model based on a liquid phase fraction concept in the ash particle. The gas phase properties are calculated by three dimensional time-mean Eulerian conservation equations. The turbulent flow field is determined by the k-ε two equations model. Radiative heat transfer is calculated by the discrete transfer radiation method. Coal gasification reaction model is composed of three chemical processes in the current model: a pyrolysis, a char gasification and gas phase reactions. 2 tons/day (t/d) air-blown pressurized entrained flow coal gasifier, which has been constructed and operated by Central Research Institute of Electric Power Industry (CRIEPI) was targetted. As a result, a relationship between an operating condition (air ratio) of the gasifier and the gasifier performance is presented. The trend of the ash deposition on the gasifier inner wall is also presented. Comparison between the computational and the experimental results shows that the most feature of the gasifier performance and the profile of the ash deposition have been captured by the present model. It was confirmed that the numerical simulation approach is very useful for the assessment of gasifier performance and operation support.

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