Waste heat refers to the sensible heat and latent heat that have not been reasonably utilized in the energy consumption devices of industrial enterprises that have been put into production due to historical, technical, conceptual and other factors. It includes high-temperature waste gas waste heat, cooling medium waste heat, waste steam waste water waste heat, high-temperature products and slag waste heat, chemical reaction waste heat, combustible waste gas waste liquid and waste waste waste heat. According to the survey, the total amount of waste heat resources in various industries accounts for about 17%~67% of the total fuel consumption, and the recoverable waste heat resources account for about 60% of the total amount of waste heat resources.