Waste heat is energy that is not used in energy recovery equipment under certain economic and technical conditions, i.e. redundant and wasted energy.
It includes seven types: high temperature waste gas waste heat, coolant waste heat, steam and wastewater waste heat, high temperature product and slag waste heat, waste heat chemical reactions, combustible waste gases. liquid waste and waste, waste heat and residual pressure of high pressure fluid.
According to the survey, the total waste heat resources of various industries account for about 17% to 67% of their total fuel consumption, and the recyclable waste heat resources account for about 60% of the total resources of residual heat. .
Gas recovery technologyhigh temperature combustion and power generation of steel industry heating furnaces can recover all costs in the same year and increase the heat utilization rate by 5-10%.
Detailed information:
Usage methods
There are many ways to recover and use waste heat. Generally speaking, the overall use of waste heat is the best solution; the second is direct use; the third is indirect use (generation of steam for electricity production).
For example, the steel industry: coke ovens in steel mills.
At present, large and medium-sized steel enterprises in China own more than 50 large and small coke ovens of various specifications. Except for Shanghai Baosteel, whose industrialization level has reached the international level, other factoriesicants have them. high energy consumption levels and have great digging potential.
The flue gas converter power generation and power generation system in the steel factory can be equipped with 80 power plants with a power generation capacity of 3,000 kW. There are now more than 20 electric furnaces in steel plants nationwide, among which the 65-ton furnace can generate more than 5,000 kW per furnace.
Baidu Encyclopedia - Residual thermal energy production