Annealing furnace waste heat recovery in float glass production process, annealing workshop is to reduce and eliminate the residual stress in the glass, so that it is enabled and distributed within a reasonable range of values. Cooling the glass in the cooling process by the outward appearance, it will cause the edge portion and the intermediate glass, internal and external temperature gradients. Uneven temperature will produce internal stress of the glass. As the temperature is reduced to the rigidity of the glass will change the direction of the surface and edge of the low temperature of the glass, they will reach an equilibrium state is no longer under the volume contraction, while the internal temperature of the glass surface area of ??high temperature, will continue to shrink, it will produce permanent stress. In order to eliminate the permanent stress, glass annealing zone varying degrees of glass cooling, to ensure the glass quality requirements. This annealing process to ensure the quality of flat glass, will produce some degree of hot air, the hot air is substantially discharged into the outdoors, causing varying degrees of thermal pollution and waste of resources. After our research team of float glass annealing process a lot of deep research, develop and successfully put into operation the first float glass annealing kiln waste heat recovery projects, and combined heat and power plant glass line, the low quality heat energy into high-quality steam, brought tremendous benefits to customers.