Abstract
Combustion properties of coal gasification gas with CO_2 dilution were investigated for a newly proposed IGCC power generation system with CO_2 capture. In this system, the gasification gas is burned under high CO_2 concentration atmosphere. In order to clarify the effects of CO_2 dilution on the combustion properties of coal gasification gas, the laminar and turbulent burning velocities were measured for stoichiometric H_2/O_2/CO_2 flames and CO/O_2/CO_2 flames under the condition of constant flame temperature of 1300, 1500 and 1700℃. For both H_2 flames and CO flames, the unstretched laminar burning velocities, u_l of CO_2 diluted flames were smaller than those of N_2 diluted flames. CO_2 dilution caused the increase in the turbulence Karlovitz number and decrease in the Lewis number.
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