Characteristic of Low Calorific Fuel Gas Combustion in Porous Burner by Preheating Air

2014 ◽  
Vol 624 ◽  
pp. 361-365 ◽  
Author(s):  
Min Hui Fan ◽  
Guan Qing Wang ◽  
Dan Luo ◽  
Ri Zan Li ◽  
Ning Ding ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Flame Propagation ◽  
Reaction Rate ◽  
Combustion Characteristic ◽  
Gas Combustion ◽  
Fuel Gas ◽  
Flame Propagation Velocity ◽  
Co Oxidation Reaction ◽  
Porous Burner ◽  
Reaction Region

The combustion characteristic of low calorific fuel gas was numerically investigated in porous burner by preheating air. Two-dimensional temperature profile, flame propagation precess, and CO reaction rate were analyzed detailly by preheating air, and compared with that of room air. The results showed that when the air is preheated, the combustion flame location locates to upstream, the maximum combustion temperature is higher than that of room air, and flame propagation velocity decreases.The CO oxidation reaction rate increases gradually with the radius distance increaing, but reaction region decreases. CO oxidation region guradually decreases and locates to the upstream with air preheating temperature increasing. Peaks of CO oxidation rate gradually change from two to one.

Characteristic of Low Calorific Fuel Gas Combustion in a Pressurized Porous Burner

2014 ◽  
Vol 1070-1072 ◽  
pp. 1713-1717
Author(s):  
Guan Qing Wang ◽  
Dan Luo ◽  
Ning Ding ◽  
Jiang Rong Xu
Keyword(s):  
Flame Front ◽  
Temperature Profile ◽  
Axial Direction ◽  
Normal Pressure ◽  
Maximum Temperature ◽  
Combustion Characteristic ◽  
Gas Combustion ◽  
Fuel Gas ◽  
Flame Propagation Velocity ◽  
Porous Burner

Combustion characteristic of low calorific fuel gas in a pressurized porous burner was numerically investigated. The two-dimensional temperature profile, flame front, and CO concentration distribution were analyzed under the pressure at the certain operating parameters, and compared with those of the normal pressure. The results shows that the pressured temperature profile is more clear than that of the normal pressure, and maximum temperature distribution region is larger. Compared with the normal pressure, the pressured flame front location is at the downstream, and the flame propagation velocity along with inclination increases with the pressure increasing. The CO distribution is corresponding to the temperature profile. Its maximum locates at the position of the flame front, and gradually decreasing along the axial direction. It decreases with the pressure increasing, which indicates that the pressure contributes to improve the combustion efficiency.

Flame front stability of low calorific fuel gas combustion with preheated air in a porous burner

Energy ◽  
2019 ◽  
Vol 170 ◽  
pp. 1279-1288 ◽  
Author(s):  
Guanqing Wang ◽  
Pengbo Tang ◽  
Yuan Li ◽  
Jiangrong Xu ◽  
Franz Durst
Keyword(s):  
Flame Front ◽  
Gas Combustion ◽  
Fuel Gas ◽  
Porous Burner ◽  
Front Stability

scholarly journals On Laminar Rich Premixed Polydisperse Spray Flame Propagation with Heat Loss

2016 ◽  
Vol 2016 ◽  
pp. 1-14 ◽  
Author(s):  
G. Kats ◽  
J. B. Greenberg
Keyword(s):  
Heat Loss ◽  
Flame Propagation ◽  
Reaction Rate ◽  
Burning Velocity ◽  
Laminar Burning Velocity ◽  
Fuel Gas ◽  
Evaporation Coefficient ◽  
Spray Flame ◽  
Distributed Approximation ◽  
Main Factor

A mathematical analysis of laminar premixed spray flame propagation with heat loss is presented. The analysis makes use of a distributed approximation of the Arrhenius exponential term in the reaction rate expression and leads to an implicit expression for the laminar burning velocity dependent on the spray-related parameters for the fuel, gas-related parameters and the intensity of the heat losses. It is shown that the initial droplet load, the value of the evaporation coefficient, and the initial size distribution are the spray-related parameters which exert an influence on the onset of extinction. The combination of these parameters governs the manner in which the spray heat loss is distributed spatially and it is this feature that is the main factor, when taken together with volumetric heat loss, which determines the spray’s impact on flame propagation and extinction.

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