Numerical Investigation for the Temperature Dependency of Coke Degradation by CO<sub>2</sub> Gasification Reaction in a Blast Furnace

One approach to reduce CO2 emission in the steelmaking industry is to recycle scrap to the blast furnace/basic oxygen furnace (BF/BOF) production system. This paper performed a numerical investigation on the BF operation with scrap charging. The investigated BF was with an inner volume of 820 m3, producing 2950 tons of hot metal per day (tHM/d). The simulated results indicated the following: Extra scrap addition in BF causes the decrease of shaft temperature, the decrease of local gas utilization, and the lowering of cohesive zone position, leading to an unstable BF running. The partial replacement of sinter with scrap in BF can mitigate the negative effects induced by scrap charging. The optimal scrap rate in the BF is 178 kg/tHM, under which the BF reaches a productivity of 3310 tHM/d, a top-gas utilization of 48.5%, and a top-gas temperature of 445 K. Compared to the base case, in the BF operation with scrap charging, the BF productivity is increased by 360 kg/tHM, its pulverized-coal rate and coke rate are decreased by 16.3 kg/tHM and 39.8 kg/tHM, respectively.

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Characterizations of the hot blast furnace slag on coal gasification reaction

Applied Thermal Engineering ◽

10.1016/j.applthermaleng.2015.12.029 ◽

2016 ◽

Vol 98 ◽

pp. 936-943 ◽

Cited By ~ 21

Author(s):

Wenjun Duan ◽

Qingbo Yu ◽

Junxiang Liu ◽

Limin Hou ◽

Huaqing Xie ◽

...

Keyword(s):

Blast Furnace ◽

Blast Furnace Slag ◽

Coal Gasification ◽

Hot Blast ◽

Gasification Reaction ◽

Furnace Slag

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Experimental and numerical investigation of static and fatigue behavior of mortar with blast furnace slag sand as fine aggregates in air and water

Construction and Building Materials ◽

10.1016/j.conbuildmat.2017.03.147 ◽

2017 ◽

Vol 143 ◽

pp. 429-443 ◽

Cited By ~ 9

Author(s):

Muhammad Aboubakar Farooq ◽

Yasuhiko Sato ◽

Toshiki Ayano ◽

Kyoji Niitani

Keyword(s):

Blast Furnace ◽

Numerical Investigation ◽

Blast Furnace Slag ◽

Fatigue Behavior ◽

Fine Aggregates ◽

Furnace Slag

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A numerical investigation into the effect of angular particle shape on blast furnace burden topography and percolation using a GPU solved discrete element model

Chemical Engineering Science ◽

10.1016/j.ces.2019.03.077 ◽

2019 ◽

Vol 204 ◽

pp. 9-26 ◽

Cited By ~ 11

Author(s):

Nicolin Govender ◽

Daniel N. Wilke ◽

Chuan-Yu Wu ◽

Ugur Tuzun ◽

Hermann Kureck

Keyword(s):

Blast Furnace ◽

Numerical Investigation ◽

Particle Shape ◽

Element Model ◽

Discrete Element ◽

Discrete Element Model

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Influence of unburned pulverized coal on gasification reaction of coke in blast furnace

High Temperature Materials and Processes ◽

10.1515/htmp-2019-0016 ◽

2019 ◽

Vol 38 (2019) ◽

pp. 733-738

Author(s):

Yi-fan Chai ◽

Guo-ping Luo ◽

Sheng-li An ◽

Jun Peng ◽

Yi-ci Wang

Keyword(s):

Activation Energy ◽

Weight Loss ◽

Blast Furnace ◽

Melting Zone ◽

Reaction Model ◽

Pulverized Coal ◽

Loss Ratio ◽

Porous Volume ◽

Gasification Reaction ◽

Weight Loss Ratio

AbstractIn order to explore the influence of unburned pulverized coal on gasification reaction of coke in blast furnace, kinetic rules of gasification reaction between CO2 and coke powder adding pulverized coals with different volatiles were studied by thermogravimetric analysis. The results showed that weight-loss ratio of samples reacted with CO2 increased after adding pulverized coal, and the weight-loss ratio rose with the increase of coal’s addition. When the content of pulverized coal was up to 50%, the weight-loss ratio of the sample which adding pulverized coal with high volatile was higher under the same temperature. The activation energy about C-CO2 gasification reaction of samples reduced observably after adding pulverized coal. The activation energy of samples had a largest decrease with 83.408 kJ mol−1 at the range of 1223 K~1373 K and it was 28.97 kJ mol−1 at the range of 1373 K~1523 K. The addition of pulverized coal with high volatile can reduce the reaction activation energy of samples more effectively. In the soft melting zone, the gasification reaction model of coke blocks attached the unburned pulverized coal was up to unreacted core model and porous volume-reacted model jointly.

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