1.Types of waste heat
Waste heat is the energy that is not utilized in the energy utilization equipment under certain economic and technical conditions, that is, the excess and waste energy. It includes high temperature waste gas waste heat, cooling medium waste heat, waste steam and 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 and high pressure fluid waste pressure and other seven kinds.
2.Application industries
Glass, metallurgy, smelting, petrochemical, building materials, ceramics, light textile and other industries with more than 280 ℃ flue gas (or other high temperature polluting gas) waste heat recovery, that is, as long as the exhaust temperature is higher than 280 ℃ industrial boilers, fluidized bed boilers, thermal oil furnace, smelting furnace, metallurgical furnace, blast furnace hot air furnace, heating furnace, as well as fertilizer plants, paper mills can be applied.
3.Recovery paths
There are many ways to recover and utilize waste heat, but there are three main ways: direct utilization of waste heat, waste heat power generation, and comprehensive utilization of waste heat.
4.Economic benefits
Waste heat recovery and utilization is an important way to improve economy and save fuel. The availability and value of waste heat is determined by both its quantity and quality. The quantity of waste heat refers to the size of waste heat, and the quality of waste heat refers to the high grade of waste heat, which can be characterized by its temperature, pressure and the medium carrying heat. The higher the grade and quantity of waste heat, the greater the availability and value of waste heat. The availability and value of waste heat is not the same as the effectiveness of waste heat utilization. The former refers to the quality and nature of the waste heat itself, which only indicates the availability of waste heat, but not the effectiveness of waste heat utilization. The latter is not only determined by the quality of the waste heat itself, but also by the place and environment where the waste heat is used and the method of using it, that is, by the object and conditions of using the waste heat. For example, the use of waste heat as heat is more effective than the use of heat as a function.
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