QUEMADOR QUE ENCIENDE COMBUSTIBLE DE BAJA COMBUSTIBILIDAD QUE COMPRENDE UN COMBUSTIBLE PULVERIZADO DE BAJA COMBUSTIBILIDAD SUMINISTRADO JUNTO CON UN AIRE CON UN SEPARADOR, UNA BOQUILLA QUE POSEE UNA PARTE ABUNDANTE Y UNA BOQUILLA QUE POSEE UNA PARTE

To provide a low combustibility fuel firing burner that can ensure high ignition performance and combustion stability even if a gas flow rate is changed along with changes in boiler load or the like. A low combustibility fuel firing burner separates a pulverized low combustibility fuel supplied together with an air with a separator, distributing the separated fuel to a rich portion nozzle and a lean portion nozzle provided in a furnace, and burning the fuel, in which a variable control part such as a core or a flow adjusting/blocking valve is provided in at least one of a high-particle-concentration gas pipe extending from a downstream side of the separator and communicating with the rich portion nozzle and a low-particle-concentration gas pipe extending from the downstream side of the separator and communicating with the lean portion nozzle.