Technology that uses excess heat energy during the production process to convert into electrical energy. Waste heat power generation not only saves energy, but also benefits environmental protection. The important equipment for waste heat power generation is waste heat boiler. It uses heat or combustible substances in waste gas, waste liquid and other working fluids as a heat source to produce steam for power generation. Since the temperature of the working fluid is not high, the boiler is large and consumes a lot of metal. The waste heat used for power generation mainly includes: high-temperature flue gas waste heat, chemical reaction waste heat, waste gas and waste liquid waste heat, low-temperature waste heat (less than 200°C), etc. In addition, there are also ways to use the excess pressure difference to generate electricity; for example, the blast furnace gas has a high pressure at the top of the furnace and can be used to generate electricity through an expansion turbine generator before being sent to gas users.

Waste heat is energy that is not utilized in energy utilization equipment under certain economic and technical conditions, that is, redundant and waste energy. It includes seven types: high-temperature waste gas waste heat, cooling medium waste heat, waste steam and waste water waste heat, high-temperature product and slag waste heat, chemical reaction waste heat, combustible waste gas waste liquid and waste material waste heat, and high-pressure fluid residual pressure. According to the survey, the total waste heat resources of various industries account for approximately 17-67% of their total fuel consumption, and the recyclable waste heat resources account for approximately 60% of the total waste heat resources.

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