Pilot-Scale Experimental Study on Chamber Combustion Method of Coal Gasification Fine Ash

Coal gasification fine ash is an industrial solid waste with high carbon content that cannot be directly utilized. To address the large-scale disposal of coal gasification fine ash, this paper proposes a combustion technology route and develops a novel burner equipped with a pre-combustion chamber and a radial staged combustion arrangement, thereby enhancing combustion stability and reducing NO_x emissions. A MW-scale pilot-scale combustion test rig is constructed to conduct combustion tests on CGFA, SC, and BC. The flue gas temperature and composition are measured at different positions in the combustion system, as well as the flue gas composition and burnout rate at the furnace outlet. The results indicate that the new PCC burner can achieve stable ignition and combustion for all three fuels tested, with temperature rise rates exceeding 2000°C/m and the peak furnace temperature reaching above 1300°C. When burning CGFA with ultra-low volatile content, the burnout rate reaches 92.68%, achieving excellent burnout performance and meeting the high-efficiency decarbonization target of CGFA. The NO_x emissions at the furnace outlet are only 147.16 mg/m³ (@6%O₂). The test results indicate that the combustion of CGFA by chamber combustion method proposed in this paper is feasible.