The part of the heat energy released during the production process that can be used is called waste heat, which is also commonly referred to as "waste heat". Waste heat has practical application cases in many industrial productions, and it is scientifically classified as "secondary energy"

The utilization level of energy grade is mainly divided according to the difference of temperature. Usually we divide it into 3 grade grades.

High-grade: waste heat higher than 650℃; it accounts for a relatively high proportion of the total waste heat energy.

Medium grade: waste heat between 650-250℃; it accounts for a relatively high proportion of the total waste heat energy and belongs to potential energy.

Low grade: residual heat below 250°C. Better secondary energy.

1 ) The high-temperature flue gas waste heat is estimated to occupy about 50% of the total waste heat resources.

2 ) Residual heat such as combustible exhaust gas and waste liquid is estimated to account for about 8% of the total waste heat resources.

3 ) The waste heat generated by the chemical reaction of substances is estimated to occupy about 5-9% of the total waste heat resources.

4 ) The waste heat of the cooling medium is estimated to occupy about 15-23% of the total waste heat resources.

5 ) The waste heat of high-temperature products and high-temperature boiler slag is estimated to account for about 6-14% of the total waste heat resources.

6 ) The waste heat of exhaust gas and wastewater discharged is estimated to occupy about 10-16% of the total waste heat resources.

There are two main methods for waste heat recovery and utilization: direct recovery method, which uses waste heat medium as fuel for heat utilization, or heat utilization through direct radiation; indirect recovery method, plate heat exchanger transfers part of the energy of the heat medium to the cold medium. Converted into reusable energy, which is also a relatively common method of waste heat recovery.

Amasi's high-efficiency plate waste heat recovery device is widely used in boilers, engines, cogeneration systems, direct-fired turbines, gas turbines, industrial furnaces (heating furnaces, kilns, etc.). Steam and waste gas (steam) heat recovery and utilization will bring more significant economic benefits to users.