不同喷吹煤种对除尘灰中未燃煤粉影响

doi:10.13228/j.boyuan.issn0449-749x.20150178

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Abstract The amount of injected coal was approximately 160 kg for a BF in a domestic steel mills recently， a study on BF dust（gravitational dust and cloth-bag dust）has been carried on when the Chenxu coal and the Zhenghe coal were injected in different period.The particle composition and the distribution of particles in BF dust showed that the diameter of particles in gravitational dust was mainly among 10 μm and 110 μm， 96% particles were smaller than 110 μm； while 60% particles in gravitational dust lied among 74 to 297 μm.The particles of cloth-bag dust mainly scattered from 3 to 30 μm， 80% particles were smaller than 20 μm. The area ratio of different microscopic structure in BF dust has been given out according to petrographical microanalysis. Based on the utilization degree of the unconsumed pulverized coal and the coke， the ratio of unconsumed pulverized coal of different coals in the current BF was determined according to the chemical and petrographical analysis. Finally， the influence of different coal injection on the amount of unconsumed pulverized coal was evaluated. It could be preliminary concluded that the reactivity and the combustibility for both coals were well， while the content of unconsumed pulverized coal in BF dust was smaller when injecting Zhenghe coal into BF. And it is reliabe to use the combustibility and reactivity-which can be obtained by laboratory thermogravimetric method-as two key indexs for evaluating the utilization of coal in actual plant production.

Key words： BF PCI BF dust distribution of particles unconsumed pulverized coal

Received: 22 April 2015 Published: 18 March 2016

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ZHANG Tong-Zhong. Different coal injection on unconsumed pulverized coal in BF dust[J]. Iron and Steel, 2016, 51(3): 9-15.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20150178 OR http://www.chinamet.cn/Jweb_gt/EN/Y2016/V51/I3/9

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