Including seven kinds of waste heat: waste heat of high-temperature exhaust gas, waste heat of cooling medium, waste steam and waste water, waste heat of high-temperature products and slag, waste heat of chemical reaction, waste heat of combustible exhaust gas and waste, and residual pressure of high-pressure fluid.
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.
The high temperature flue gas recovery power generation technology of heating furnace in iron and steel industry can recover all the costs of the year, and the heat utilization rate is increased by 5- 10%.
Extended data:
Utilization method
There are many ways to recover waste heat. Generally speaking, the comprehensive utilization of waste heat is the best; Secondly, direct use; The third is indirect utilization (generating steam to generate electricity).
Such as the steel industry: coke ovens in steel plants.
At present, China's large and medium-sized iron and steel enterprises have more than 50 coke ovens of various specifications. Except Shanghai Baosteel, whose industrialization level has reached the international level, the energy consumption level of other manufacturers is very high, and there is still great potential to be tapped.
The converter flue gas power generation and power generation system in the steelmaking plant can be equipped with 80 power stations with a power generation capacity of 3000Kw. At present, there are more than 20 electric furnaces in China's steel mills, of which 65 tons can generate more than 5000Kw/ seat.
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