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Research Papers

Top Fuel Injection Design in an Entrained-Flow Coal Gasifier Guided by Numerical Simulations

[+] Author and Article Information
Ting Wang

Energy Conversion and Conservation Center, University of New Orleans, New Orleans, LA 70148twang@uno.edu

Armin K. Silaen

Energy Conversion and Conservation Center, University of New Orleans, New Orleans, LA 70148asilaen@uno.edu

Heng-Wen Hsu

Energy and Resources Laboratory, Industrial Technology Research Institute, Chutung, Hsinchu, Taiwan 310, R.O.C.hsuhw@itri.org.tw

Cheng-Hsien Shen

Energy and Resources Laboratory, Industrial Technology Research Institute, Chutung, Hsinchu, Taiwan 310, R.O.C.chshen@itri.org.tw

J. Thermal Sci. Eng. Appl 3(1), 011009 (Apr 11, 2011) (8 pages) doi:10.1115/1.4003529 History: Received October 08, 2010; Revised January 18, 2011; Published April 11, 2011; Online April 11, 2011

A computational fluid dynamics scheme is employed to simulate the effects of potential fuel injection techniques on gasification performance. The objective is to help design the top-loaded fuel injection arrangement for an entrained-flow gasifier using coal water slurry as the input feedstock. Two specific arrangements are investigated: (a) coaxial dual jet impingement with slurry coal in the center and oxygen in the outer jet and (b) four jet impingement with two single slurry coal jets and two single oxygen jets. When the heterogeneous finite-rate solid-gas reaction scheme is implemented, it is discovered that the particle collision model cannot be implemented with the heterogeneous gasification scheme in the present computational model. The instantaneous gasification model is later employed to examine the particle collision phenomenon by implementing the particle collision model, in which the coal (consisting of carbon and volatiles) is injected as gas, and the water is injected as droplets. The result of droplet tracks shows that the droplets are not bounced around, as speculated, at the intersection where the jets meet, and majority of the droplets pass through the jet impingement section and hit the wall as in the finite-rate case. This implies that the results of the finite rate are acceptable even though the particle collision model is not implemented. The finite-rate result actually presents a worst-case scenario for predicting wall erosion. The particle tracks for both the two concentric and four separate injection configurations show that the coal particles hit the wall and can accelerate the deterioration of the refractory bricks. The case employing two concentric injections provides better fuel-oxidant mixing and higher heating values than the case using four separate injections.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Modified gasifier with two inclined jets

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Figure 2

Four jets impinging

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Figure 3

Meshed computational domain for two concentric injectors spraying with 45 deg downward angle and 90 deg interception angle

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Figure 4

Meshed computational domain for four separate injectors spraying with 45 deg downward angle and 90 deg interception angle

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Figure 5

Coal particle tracks for two concentric coal slurry and oxidant injections with heterogeneous finite-rate solid-gas reactions. (Note that particle collision model cannot be implemented together with the heterogeneous particle reaction model.)

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Figure 6

Temperature and species mole fraction distributions on two perpendicular vertical center plane inside gasifier for concentric coal-oxidant injection case with heterogeneous finite-rate solid-gas reaction model

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Figure 7

Temperature and species mole fraction distributions on two perpendicular vertical center planes inside gasifier for concentric coal-oxidant injection case using the instantaneous gasification model implemented with particle collision model

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Figure 8

Velocity vectors and water droplet tracks on two perpendicular vertical center planes for the concentric coal-oxidant injections using the instantaneous gasification model implemented with particle collision model

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Figure 9

Coal particle tracks for four separate coal slurry and oxidant injections using finite-rate reaction. (Note: Particle collision model cannot be implemented.)

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Figure 10

Temperature and species mole fraction distributions on two perpendicular vertical center planes inside gasifier for separate coal-oxygen injection case with finite-rate reactions

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Figure 11

Temperature and species mole fraction distributions on two perpendicular vertical center planes inside gasifier for separate coal-oxygen injection case modeled using the instantaneous gasification model implemented with particle collision model

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Figure 12

Velocity vectors and water droplet tracks for the four separate coal-oxygen injection case modeled using the instantaneous gasification model

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Figure 13

The top-loaded injectors in the ITRI experimental gasifier facility

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