Rotary kiln tail waste heat boiler with independent economizer

The rotary kiln tail waste heat boiler with the independent economizer is characterized in that an air inlet valve is rotatably embedded in the middle of an air inlet pipe, air blowing pipes are installed at the two ends of the air inlet pipe, air blowing fans are installed in the middles of the air blowing pipes, and a conveying pipe is installed at the bottom of a boiler body in an embedded mode; by arranging the air blowing pipe, the air blowing fan, the conveying pipe, the air conveying control valve, the buffer cylinder, the exhaust pipe, a piston plate, an arc-shaped rod and a fixing block, waste gas extrudes the piston plate, so that the collected waste gas in the boiler body enters the buffer cylinder to be buffered and collected, and therefore buffering and collecting can be conducted when the waste gas is too much; the gas transmission control valve in the middle of the exhaust pipe is opened, waste gas in the buffer cylinder is firstly fed into the humidifying tower through the exhaust pipe, and af