Combustion Behaviors and Flame Structure of Methane/Coal Dust Hybrid in a Vertical Rectangle Chamber

2008 ◽  
Vol 180 (8) ◽  
pp. 1518-1528 ◽  
Author(s):  
D. L. Chen ◽  
J. H. Sun ◽  
Q. S. Wang ◽  
Y. Liu
Keyword(s):  
Coal Dust ◽  
Flame Structure ◽  
Vertical Rectangle ◽  
Combustion Behaviors

A Model for Flame Propagation in Low Volatile Coal Dust-Air Mixtures

1978 ◽  
Vol 100 (1) ◽  
pp. 105-111 ◽  
Author(s):  
J. L. Krazinski ◽  
R. O. Buckius ◽  
H. Krier
Keyword(s):  
Flame Propagation ◽  
Energy Transport ◽  
Laminar Flame ◽  
Solid Phase ◽  
Coal Dust ◽  
Flame Structure ◽  
Radiant Energy ◽  
Differential Approximation ◽  
Two Phase ◽  
Coal Particles

A model describing steady, laminar flame propagation in low volatile coal dust-air mixtures is presented. The model includes radiative transport, a two-phase energy equation, and heterogeneous carbon gasification of the coal particles. The differential approximation (or method of spherical harmonics) was used to represent the one-dimensional radiant energy transport. The equations were numerically integrated and predictions of flame structure and the adiabatic flame speed are presented. The effects of radiation properties and coal particle size are presented and discussed. The influence on the temperature profiles of heat released in the solid phase is also described.

Flammability Characteristics of Treated Coals

1992 ◽  
Vol 114 (1) ◽  
pp. 65-69 ◽  
Author(s):  
P. K. Collins ◽  
A. R. Schroeder ◽  
R. O. Buckius ◽  
H. Krier ◽  
J. E. Peters
Keyword(s):  
Coal Dust ◽  
Flame Structure ◽  
Flame Speed ◽  
Direct Result ◽  
Radial Temperature ◽  
Flotation Process ◽  
Gasification Process ◽  
Air Heating ◽  
Flammability Characteristics ◽  
Parent Coal

The effects of two processes used to treat coal on the flammability characteristics of the coal are presented. Experiments were conducted on an Entrained Dust Flow Facility which supports a stationary premixed coal dust and air flame. The facility is designed to provide access for thermocouples so that detailed axial and radial temperature profiles of the coal flames can be used to investigate the flame structure. Flame speeds of the coal and air mixtures were determined based on the inlet velocity of the flow and the temperature maps. Flame speed increases of over 35 percent were observed as a direct result of an aggregate flotation process which reduced the ash content and the average size of the coal and increased the volatile content and heating value. Partially devolatilized chars were burned to simulate the use of a low-volatile solid by-product of a gasification process. Under most conditions either methane addition or inlet air heating was required to establish a flame. Both methane addition and inlet air heating with the low-volatile chars resulted in improved flame stability and higher flame speeds. Relatively modest amounts (2.2 percent by volume) of methane addition with the parent coal increased the flame speed by a factor of 2 to 3.

THERMAL STABILITY AND COMBUSTION BEHAVIORS OF ENERGETIC MATERIALS BASED ON A NEW HETEROCYCLE AZASYDNONE

2018 ◽  
Vol 17 (2) ◽  
pp. 147-170 ◽  
Author(s):  
Valery V. Serushkin ◽  
Valery P. Sinditskii ◽  
Sergey A. Filatov ◽  
P. D. Kulagina ◽  
V. T. Nguyen ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Energetic Materials ◽  
Combustion Behaviors
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