Secondary Energy Recovery And Self-power Generation Mode Of Typical Steel Manufacturing Process

Modern steel metallurgy is ferro-coal chemical process. It releases energy called secondary energy by using of massive resources and energy. Under the policy of national energy saving and mitigation, the research of secondary energy utilization is the basic way to realize in-depth energy saving by steel works.Four kinds of typical steel manufacturing processes were established. The primary factors affect secondary energy amount are analysed. Secondary energy per ton steel prodcuted by ironmaking system account 86.6% for total quantity. By-product gas accounts 49.9% for each kind. Therefore, the direction and way of Chinese steel industry energy saving are ironmaking system in the future,and should enhance utllization of by-product gas and residual heat and energy. And the construction of reasonable energy network will promote the optimization of energy structure for steel plant.The key technologies of sinter residual heat recovery were discussed and preliminary optimization scheme was proposed. Residual heat recovery of exhaust gases should be considered with dedusting and desulphurization. When the fume temperature demand of precipitator inlet is higher than 80℃, it is reasonable and feasible with desulphurization. But when greater than 120℃, they can not carry on. The difficulty is the adjustment measure and the influence of stable sinter work condition on heat source parameter. The craft of heated air circulation, two windsail heated air mix and so on were proposed, and was researched the influence on output and quality of sinter ore.By-product gas is the important form of secondary energy. Power pattern and the reasonableness of"buying only coal and no electricity"were analysed. The research indicates that: power pattern includes residual heat and pressure, by-product gas and so on. The power set installed capacity of 200MW, 350MW, 400MW, and 300MW could be constructed in the four typical BF-BOF processes, and power self-sufficient will be promoted by puerchasing a certain proportion steam coal.