The research presented in this paper focuses on parameters that determine stable operating limits of porous burner. The experimental research was carried out on laboratory installation consisting of ceramic cylinder filled with packed bed of Al 2 O 3 spheres. Gaseous fuel is prepared by mixing the compressed natural gas (CNG) and nitrogen (N 2 ) in defined ratio, depending on set heating value of the inlet gaseous fuel. Experimental program included combustion of low calorific gaseous fuel (7.5 to 15 MJ/m3) within porous burner, where inlet power ranged between 2 and 4 kW. Total number of experimental sets in experimental study was 16, where seven of them were considered as stable. Results of experimental research are presented and discussed within this paper.
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