石炭ガス化ガスを模擬した水素混合気の層流および乱流燃焼特性に及ぼす二酸化炭素希釈の影響

Combustion properties of coal gasification gas with CO<SUB>2</SUB> dilution were investigated for a newly proposed IGCC power generation system with CO<SUB>2</SUB> capture. In this system, the gasification gas is burned under high CO<SUB>2</SUB> concentration atmosphere. In order to clarify the combustion properties of the gasification gas under such atmosphere, the laminar and turbulent burning velocities were investigated for outwardly propagating stoichiometric H<SUB>2</SUB>/O<SUB>2</SUB>/CO<SUB>2</SUB> flames at the mixture pressures of 0.10 to 0.50MPa, comparing them with those of H<SUB>2</SUB>/O<SUB>2</SUB>/N<SUB>2</SUB> flames. The unstretched laminar burning velocities of H<SUB>2</SUB>/O<SUB>2</SUB>/CO<SUB>2</SUB> flames were smaller than those of H<SUB>2</SUB>/O<SUB>2</SUB>/N<SUB>2</SUB> flames. The ratios of the turbulent burning velocity at the flame radius 30mm, u<SUB>tn(30mm)</SUB> to the unstretched laminar burning velocity were found to be larger than those of H<SUB>2</SUB>/O<SUB>2</SUB>/N<SUB>2</SUB> flames at the same turbulence intensity. Increase in the turbulence Karlovitz number and decrease in the Lewis number by the CO<SUB>2</SUB> dilution might cause the increase in the ratio of the turbulent burning velocity to unstretched laminar one of H<SUB>2</SUB>/O<SUB>2</SUB>/CO<SUB>2</SUB> flames.