Combustion characteristics of different types of quasi-particles in iron ore sintering process

MA Peng-nan; CHENG Ming; ZHOU Ming-xi; LI Ya-wei; ZHOU Hao

doi:10.13374/j.issn2095-9389.2019.03.004

Volume 41 Issue 3

Mar. 2019

Turn off MathJax

Article Contents

Article Navigation > Chinese Journal of Engineering > 2019 > 41(3): 316-324

MA Peng-nan, CHENG Ming, ZHOU Ming-xi, LI Ya-wei, ZHOU Hao. Combustion characteristics of different types of quasi-particles in iron ore sintering process[J]. Chinese Journal of Engineering, 2019, 41(3): 316-324. doi: 10.13374/j.issn2095-9389.2019.03.004

Citation:

MA Peng-nan, CHENG Ming, ZHOU Ming-xi, LI Ya-wei, ZHOU Hao. Combustion characteristics of different types of quasi-particles in iron ore sintering process[J]. Chinese Journal of Engineering, 2019, 41(3): 316-324. doi: 10.13374/j.issn2095-9389.2019.03.004

Citation:

PDF( 1006 KB)

Combustion characteristics of different types of quasi-particles in iron ore sintering process

doi: 10.13374/j.issn2095-9389.2019.03.004

State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China

More Information

Corresponding author: ZHOU Hao, E-mail: zhouhao@zju.edu.cn
Received Date: 2018-01-26
Publish Date: 2019-03-20

Abstract

Abstract

The iron ore sintering process is the main source of NO_x emissions and accounts for about 48% of the total NO_x emissions in the iron and steel industry. The generated NO_x is mainly from fuel consumption, and it usually exists in the form of quasi-particle in iron ore sintering bed. Therefore, it is important to deeply understand the combustion characteristics and NO_x formation mechanism of quasi-particles in iron ore sintering process. Based on this, the effects of coke breeze particle size, presence of an adhering layer of quasi-particles, adhering ratio of quasi-particle, and coke breeze content on the mass conversion rate of different types of quasiparticles and conversion rate of fuel-N to NO_x were investigated in a vertical quartz tube reactor in detail. The results show that the mass conversion rate decreases with increasing coke breeze particle size for S'- and S-type quasi-particles; the conversion rate of fuel-N to NO_x decreases with increasing coke breeze particle size for S'-type quasi-particle and exhibits the opposite trend for S-type quasi-particle, which is because of the presence of an adhering layer consisting of fine iron ore and limestone. Considering the combustion characteristics of S-and S'-type quasi-particles, the presence of an adhering layer of quasi-particles favors the increase of mass conversion rate and conversion rate of fuel-N to NO_x. The mass conversion rate and conversion rate of fuel-N to NO_x both decrease with increasing adhering ratio for C-type quasi-particles whose adhering layer consists of fine limestone and coke breeze. For P-type quasi-particles comprising coke breeze, fine limestone, and fine iron ore, the mass conversion rate decreases with increasing coke breeze content. The conversion rate of fuel-N to NO_x is not linear and reaches the lowest value when coke breeze content is 50%.
- iron ore sintering,
- quasi-particle,
- mass conversion rate,
- conversion rate of fuel-N to NO_x,
- NO_x emissions

FullText(HTML)

References(23)

References

[1]	龍紅明. 鐵礦石燒結過程熱狀態模型的研究與應用[學位論文]. 長沙: 中南大學, 2007 Long H M. Research and Application on Sintering Thermal State Model of Iron Ore[Dissertation]. Changsha: Central South University, 2007
[2]	Ohno K I, Noda K, Nishioka K, et al. Combustion rate of coke in quasi-particle at iron ore sintering process. ISIJ Int, 2013, 53(9): 1588 doi: 10.2355/isijinternational.53.1588
[3]	世界金屬導報. 2016年全球粗鋼產量重回增長軌道. (2017-02-18)[2018-01-15]. http://www.worldmetals.com.cn/viscms/xingyeyaowen3686/240285.jhtml World metals. Global crude steel production in 2016 return to growth. (2017-02-18)[2018-01-15]. http://www.worldmetals.com.cn/viscms/xingyeyaowen3686/240285.jhtml.
[4]	劉大鈞, 魏有權, 楊麗琴. 我國鋼鐵生產企業氮氧化物減排形勢研究. 環境工程, 2012, 30(5): 118 doi: 10.3969/j.issn.1671-1556.2012.05.030 Liu D J, Wei Y Q, Yang L Q. Research of emission reduction situation of nitrogen oxides in China's iron and steel enterprises. Environ Eng, 2012, 30(5): 118 doi: 10.3969/j.issn.1671-1556.2012.05.030
[5]	Hill S C, Smoot L D. Modeling of nitrogen oxides formation and destruction in combustion systems. Prog Energy Combust Sci, 2000, 26(4-6): 417 doi: 10.1016/S0360-1285(00)00011-3
[6]	Zhou H, Zhou M X, Liu Z H, et al. Modeling NO_x emission of coke combustion in iron ore sintering process and its experimental validation. Fuel, 2016, 179: 322 doi: 10.1016/j.fuel.2016.03.098
[7]	Loo C E. Role of coke size in sintering of hematite ore blend. Ironmaking Steelmaking, 1991, 18(1): 33
[8]	Teo C S, Mikka R A, Loo C E. Positioning coke particles in iron ore sintering. ISIJ Int, 1992, 32(10): 1047 doi: 10.2355/isijinternational.32.1047
[9]	肥田行博, 佐々木稔, 榎戸恒夫, 等. 焼結鉱製造過程でのコークス燃焼におよぼす擬似粒子中コークス賦存狀態の影響. 鉄と鋼, 1982, 68(3): 400 Hida Y, Sasaki M, Enokido T, et al. Effect of the existing state of coke breeze in quasi-particles of raw mix on coke combustion in the sintering process. Tetsu-to-Hagane, 1982, 68(3): 400
[10]	Ogi H, Maeda T, Ohno K I, et al. Effect of coke breeze distribution on coke combustion rate of the quasi-particle. ISIJ Int, 2015, 55(12): 2550 doi: 10.2355/isijinternational.ISIJINT-2015-089
[11]	Arikata Y, Yamamoto K, Sassa Y. Effect of coke breeze addition timing on sintering operation. ISIJ Int, 2013, 53(9): 1523 doi: 10.2355/isijinternational.53.1523
[12]	大場雄介, 小西宏和, 小野英樹, 等. 粉末Fe₃O₄とCaOで被覆したコークスの燃焼挙動. 鉄と鋼, 2017, 103(6): 299 Oba Y, Konishi H, Ono H, et al. Combustion behavior of coated cokes with fine Fe₃O₄ and CaO. Tetsu-to-Hagane, 2017, 103(6): 299
[13]	Gan M, Fan X H, Lv W, et al. Fuel pre-granulation for reducing NO_x, emissions from the iron ore sintering process. Powder Technol, 2016, 301: 478 doi: 10.1016/j.powtec.2016.05.043
[14]	Gan M, Fan X H, Ji Z Y, et al. Effect of distribution of biomass fuel in granules on iron ore sintering and NO_x emission. Ironmaking Steelmaking, 2014, 41(6): 430 doi: 10.1179/1743281213Y.0000000138
[15]	Hou P, Choi S, Choi E, et al. Improved distribution of fuel particlesin iron ore sintering process. Ironmaking Steelmaking, 2011, 38(5): 379 doi: 10.1179/1743281211Y.0000000017
[16]	Terushige N, Masanori N, Tetsuya N. Effect ofgranule structure on the combustion behavior of coke breeze//Proceedings of the 5th International Congress on the Science and Technology of Ironmaking. Shanghai, 2009: 198
[17]	Tobu Y, Nakano M, Nakagawa T, et al. Effect of granule structure on the combustion behavior of coke breeze for iron ore sintering. ISIJ Int, 2013, 53(9): 1594 doi: 10.2355/isijinternational.53.1594
[18]	葛西栄輝, 大森康男. アルミナを擬似鉱石とした賦存狀態の異なるコークスの充填層內燃焼速度. 鉄と鋼, 1986, 72(10): 1537 Kasai E, Omori Y. Combustion rate of coke at different existing states prepared by fine alumina. Tetsu-to-Hagane, 1986, 72(10): 1537
[19]	Zhao J P, Loo C E, Dukino R D. Modelling fuel combustion in iron ore sintering. Combust Flame, 2015, 162(4): 1019 doi: 10.1016/j.combustflame.2014.09.026
[20]	Kasai E, Wu S L, Sugiyama T, et al. Combustion rate and NO emission during combustion of coke granules in packed beds. ISIJ Int, 1992, 78(7): 1005 http://www.researchgate.net/publication/288555320_Combustion_Rate_and_NO_Emission_during_Combustion_of_Coke_Granules_in_Packed_Beds
[21]	葛西栄輝, 齋藤文良. 鉄鉱石焼結プロセスにおける炭材燃料構造の最適化による窒素酸化物発生量の低減. 化學工學論文集, 秋田, 1994: 857 Kasai E, Saito F. Reduction of nitrogen oxides emission from the iron ore sintering process by optimizing the structure of carbonaceous fuels. Kagaku Kōgaku Ronbunshū, Akita-ken, 1994: 857
[22]	Katayama K, Kasama S. Influence of lime coating coke on NO_x concentration in sintering process. ISIJ Int, 2016, 56(9): 1563 doi: 10.2355/isijinternational.ISIJINT-2015-742
[23]	Duan W J, Yu Q B, Wu T W, et al. The steam gasification of coal with molten blast furnace slag as heat carrier and catalyst: Kinetic study. Int J Hydrogen Energy, 2016, 41(42): 18995 doi: 10.1016/j.ijhydene.2016.07.187