Waste heat recovery device for outer wall of cement rotary kiln

The invention discloses a waste heat recovery device for an outer wall of a cement rotary kiln outer wall, relates to the field of energy conservation in production of cement, provides a waste heat recovery device for an outer wall of a cement rotary kiln, and the waste heat recovery device can utilize the waste heat of the outer wall of the cement rotary kiln to heat water. The waste heat recovery device comprises the cement rotary kiln, a heat collectors, a water inlet pipe and a water outlet pipe, wherein the heat collector is arranged on the exterior of the cement rotary kiln, a distance is reserved between the heat collector and the cement rotary kiln, and the external water inlet pipe and the water outlet pipe are respectively connected with two ends of the heat collector. The waste heat recovery device disclosed by the invention can be additionally arranged on the exterior of the outer wall of the cement rotary kiln, and the waste heat of the outer wall of the cement rotary kiln can be utilized to heat the water.