Combustible waste injection device and method for operating the same

A combustible waste injection device which can be attached to a cement kiln burner device having at least one air flow channel in an inner side of a powdered-solid-fuel flow channel, the combustible waste injection device comprising:

• a combustible waste flow channel which is arranged in an inner side of the air flow channel in an innermost shell, is installed in parallel to an axial direction of the cement kiln burner device and is provided for flow feeding a combustible waste flow;
• an assist air flow channel which is installed in parallel to the combustible waste flow channel, at a position outside the combustible waste flow channel;
• and
• an assist air inflow port communicating the assist air flow channel and the combustible waste flow channel in the vicinity of an injection port of the combustible waste flow channel,
• wherein the assist air flow channel includes an upper side flow channel located above a horizontal plane including the axis center of the combustible waste flow channel when cutting with a plane orthogonal to the axis center of the combustible waste flow channel, and a lower side flow channel located below the horizontal plane and partitioned with respect to the upper side flow channel,
• the assist air inflow port is arranged at a plurality of positions in relation to a circumferential direction sandwiching in a vertical direction the horizontal plane, and
• the combustible waste injection device further comprises a flow controller which independently controls a flow rate through each of the upper and lower side flow channels.