Experimental Study of Surface and Interior Combustion Using Composite Porous Inert Media

Combustion Modes ◽

Porous Inert Media ◽

Combustion using silicon carbide coated, carbon-carbon composite porous inert media (PIM) was investigated. Two combustion modes, surface and interior, depending upon the location of flame stabilization, were considered. Combustion performance was evaluated by measurements of pressure drop across the PIM, emissions of NOx and CO, and the lean blow-off limit. Data were obtained for the two combustion modes at identical conditions for a range of reactant flowrates, equivalence ratios, and pore sizes of the PIM. Results affirm PIM combustion as an effective method to extend the blow-off limit in lean premixed combustion.

Experimental Study of Surface and Interior Combustion Using Composite Porous Inert Media

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.1789516 ◽

2005 ◽

Vol 127 (2) ◽

pp. 307-313 ◽

Cited By ~ 37

Author(s):

T. L. Marbach ◽

A. K. Agrawal

Keyword(s):

Experimental Study ◽

Silicon Carbide ◽

Pressure Drop ◽

Carbon Composite ◽

Flame Stabilization ◽

Premixed Combustion ◽

Combustion Modes ◽

Porous Inert Media ◽

Combustion using silicon carbide coated, carbon–carbon composite porous inert media (PIM) was investigated. Two combustion modes, surface and interior, depending upon the location of flame stabilization, were considered. Combustion performance was evaluated by measurements of pressure drop across the PIM, emissions of NOx and CO, and the lean blow-off limit. Data were obtained for the two combustion modes at identical conditions for a range of reactant flowrates, equivalence ratios, and pore sizes of the PIM. Results affirm PIM combustion as an effective method to extend the blow-off limit in lean premixed combustion.

Lean Premixed Combustion of Carbon-Monoxide-Hydrogen-Methane Fuel Mixtures Using Porous Inert Media

Volume 2: Turbo Expo 2005 ◽

10.1115/gt2005-68586 ◽

2005 ◽

Cited By ~ 4

Author(s):

S. K. Alavandi ◽

A. K. Agrawal

Keyword(s):

Carbon Monoxide ◽

Flame Temperature ◽

Carbon Foam ◽

Premixed Combustion ◽

Nox Emissions ◽

Lean Premixed ◽

Porous Inert Media ◽

Fuel Mixtures ◽

Lean premixed combustion of carbon monoxide (CO), hydrogen (H2), and methane (CH4) fuel mixtures with air was investigated experimentally. Combustion at atmospheric pressure was stabilized within porous inert medium made of silicon-carbide coated carbon foam with 4 pores per centimeter. CH4 in the fuel was varied from 100% to 0% (by volume), with the remaining fuel containing equal amounts of CO and H2. Experiments at a fixed air flow rate were conducted by varying the adiabatic flame temperature and fuel composition. Profile of CO and NOx emissions in the axial and transverse directions were taken to identify the post-combustion zone and uniformity of combustion. At a given flame temperature, fuels with CO/H2 produced lower CO and NOx emissions compared to those for CH4. The temperature at the lean blow off limit was significantly lower (compared to CH4) if the fuel contained CO and H2, each greater than 35% by volume.

Lean Premixed Combustion of Methane and Hydrogen-Enriched Methane Using Porous Inert Media

Volume 7: Turbo Expo 2004 ◽

10.1115/gt2004-53231 ◽

2004 ◽

Cited By ~ 1

Author(s):

S. K. Alavandi ◽

A. K. Agrawal

Keyword(s):

Flame Temperature ◽

Premixed Combustion ◽

Emission Characteristics ◽

Commercial Grade ◽

Lean Premixed ◽

Volume Measurements ◽

Carbon Core ◽

Porous Inert Media ◽

This paper presents an experimental investigation on lean premixed combustion of methane and hydrogen-enriched methane. The combustion was stabilized on the surface of a porous inert media made of silicon-carbide coated carbon core with 4 pores per centimeter. Experiments were conducted using commercial grade methane (99% purity) and a mixture of 70% methane and 30% hydrogen, by volume. Measurements of NOx and CO emissions were taken for a range of airflow rates and adiabatic flame temperatures. The combustor turndown ratio was varied by a factor of 6. Emission characteristics were compared for a given adiabatic flame temperature, representing energy input to the combustor. Results show lower CO emissions and extended lean blow off limit when hydrogen was added to the methane fuel.