A comprehensive utilization process and device for sintering waste heat

Abstract

The invention relates to an integrated utilization technology and device of sintering waste heat. The hot smoke of a cooling machine section 1 passes through a medium-pressure superheater and a medium-pressure evaporator I; the hot smoke of section 2 passes through a medium-pressure evaporator II and a medium-pressure preheater; the smoke of the section 1 and the section 2 is collected through pipelines and passes through a vertical type low-pressure superheater and a low-pressure evaporator, and then is sent back to ring cold section 1 and section 2 to continuously cool and sinter mineral aggregates; the feedwater passes through a feedwater preheater, then enters into a deoxygenization water tank after being deoxygenized by a thermal deaerator; the water is naturally circulated between the low-pressure evaporator and a low-pressure boiler barrel, heat exchange is realized, and the generated saturated steam passes through the low-pressure superheater for external supply. The technology provided by the invention has the advantages that after adopting the waste heat integrated utilization scheme, gradient scientific utilization of waste heat resource of the existing sintering circuit is realized, matched waste heat utilization equipment is arranged at each waste heat resource point so as to achieve maximization of waste heat utilization, and meanwhile, the produced superheated steam has a wide secondary utilization value, thus being convenient forfacilitating the long-distance conveying of the steam.

Description

technical field [0001] The invention relates to a process and device for comprehensive utilization of sintering waste heat, in particular to a process and device for comprehensive utilization of waste heat in existing sintering plants of iron and steel enterprises. Background technique [0002] Studies have shown that the waste heat of flue gas from the main flue of the sintering machine accounts for about 13% to 23% of the energy consumption of the sintering process, and the waste heat of the exhaust gas from the cooler accounts for 19% to 35% of the energy consumption of the sintering process, and the sum of the two is as high as 50%. The production of secondary energy is 1.62GJ / ton. It can be seen that the recovery potential of waste heat in sintering plants is huge, and the focus of recovery should be recovery of waste heat from sintering waste (flue) gas and sensible heat from sintering ore. [0003] At present, there are mainly four ways to recover and utilize the was...

AI Technical Summary

Problems solved by technology

Domestic iron and steel enterprises mostly use the above method to recycle sintering waste heat. This method does not fully reflect the value of sintering flue gas waste heat, and the recovered waste heat is not fully utilized, resulting in secondary waste of energy.

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