Three-Dimensional Mathematical Model of Multiphase Combustion in Full Oxygen Blast Furnace

2013 ◽  
Author(s):  
Zeyi Jiang ◽  
Yan Xie ◽  
Peng Jin ◽  
Qingguo Xue ◽  
Xinxin Zhang
Keyword(s):  
Blast Furnace ◽  
Three Dimensional ◽  
Particle Diameter ◽  
Pulverized Coal ◽  
Operating Conditions ◽  
Qualitative And Quantitative Analysis ◽  
Qualitative And Quantitative ◽  
Oxygen Blast Furnace ◽  
Oxygen Blast ◽  
Reductive Atmosphere

The complicated combustion of pulverized coal, free coke and cycle gas in the raceway of full oxygen blast furnace (FOBF) is different from the process in a traditional blast furnace. The differences of free nitrogen, cycle gas mixture, increased coal rate and decreased blast temperature contribute to the complexity of reductive conditions with temperature and composition. A three-dimensional CFD model considering the processes in the regions of raceway, blowpipe, deadman and dropping-zone is developed to describe the kinetic, thermal and chemical behaviors of the fuel combustion. The qualitative and quantitative analysis is conducted to evaluate the effects of operating conditions including temperature of cycle gas, injecting rate and particle diameter of pulverized coal. Simulation results show that large amount of pulverized coal injection (PCI) and also cycle gas injection is feasible with the high oxygen concentration for oxygen blast furnace. The coal injecting rate is a sensitive parameter for the combustion effect in raceway and corresponding measures must be considered for the enhancement of PCI. FOBF process could construct stronger reductive atmosphere than traditional blast furnace, which is beneficial to improve the productivity.

scholarly journals Experiment Research on Pulverized Coal Combustion in the Tuyere of Oxygen Blast Furnace

2019 ◽  
Vol 38 (2019) ◽  
pp. 42-49 ◽  
Author(s):  
Yi-fan Chai ◽  
Jian-liang Zhang ◽  
Qiu-jun Shao ◽  
Xiao-jun Ning ◽  
Kai-di Wang
Keyword(s):  
Blast Furnace ◽  
Combustion Rate ◽  
Pulverized Coal ◽  
Pulverized Coal Combustion ◽  
Pulverized Coal Injection ◽  
Oxygen Blast Furnace ◽  
Coal Injection ◽  
Oxygen Blast ◽  
The Relationship ◽  
Injection Ratio

AbstractThe actual combustion rate of pulverized coal in the blast furnace tuyere is hard to be measured. In this research, the combustion rate of pulverized coal injected into oxygen blast furnace was obtained by a new equipment. This equipment can simulate the actual blast furnace well, and the relationship between pulverized coal injection (PCI) ratio and AO/C was established by mathematical deduction. The experimental results show that the best combustibility of the four pulverized coals is C, and when the coal injection ratio is 350 kg/tHM, the combustion rate can be reached 79%, while the combustion rate of B in the same case is only 45.6%. With the increase of AO/C, the relative amount of oxygen to coal increases, the combustion conditions become better, and combustion rate of the pulverized coal increases. In addition, under the condition of high temperature and rapid combustion, with the increase of coal’s volatile, the combustion rate increases and the corresponding PCI ratio is also increased. By using the new equipment, the unburned coal under the oxygen blast furnace conditions can be collected for further study.

Influence of Injecting Reducing Gas Through Novel Tuyeres on the Combustion of Pulverized Coal in a 40% Oxygen Blast Furnace

JOM ◽  
2022 ◽  
Author(s):  
Xing Peng ◽  
Jingsong Wang ◽  
Haibin Zuo ◽  
Guang Wang ◽  
Xuefeng She ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Pulverized Coal ◽  
Reducing Gas ◽  
Oxygen Blast Furnace ◽  
Oxygen Blast

Static Holdup of Liquid Slag in Simulated Packed Coke Bed Under Oxygen Blast Furnace Ironmaking Conditions

JOM ◽  
2017 ◽  
Vol 70 (1) ◽  
pp. 29-33 ◽  
Author(s):  
Guang Wang ◽  
Yingli Liu ◽  
Zhenfeng Zhou ◽  
Jingsong Wang ◽  
Qingguo Xue
Keyword(s):  
Blast Furnace ◽  
Liquid Slag ◽  
Oxygen Blast Furnace ◽  
Blast Furnace Ironmaking ◽  
Oxygen Blast

Study on the interaction behaviour between lump and sinter under the condition of oxygen blast furnace

2016 ◽  
Vol 43 (6) ◽  
pp. 458-464 ◽  
Author(s):  
Long Chen ◽  
Qingguo Xue ◽  
Wentao Guo ◽  
Xuefeng She ◽  
Jingsong Wang
Keyword(s):  
Blast Furnace ◽  
Oxygen Blast Furnace ◽  
Oxygen Blast

Kinetic analysis of iron oxide reduction in top gas recycling oxygen blast furnace

2012 ◽  
Vol 39 (5) ◽  
pp. 313-317 ◽  
Author(s):  
Y H Han ◽  
J S Wang ◽  
R Z Lan ◽  
L T Wang ◽  
X J Zuo ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Iron Oxide ◽  
Kinetic Analysis ◽  
Oxide Reduction ◽  
Iron Oxide Reduction ◽  
Oxygen Blast Furnace ◽  
Oxygen Blast ◽  
Top Gas Recycling ◽  
Gas Recycling

scholarly journals Management of Instrument Sterilization Workflow in Endodontics: A Systematic Review and Meta-Analysis

2020 ◽  
Vol 2020 ◽  
pp. 1-20 ◽  
Author(s):  
Mario Dioguardi ◽  
Diego Sovereto ◽  
Gaetano Illuzzi ◽  
Enrica Laneve ◽  
Bruna Raddato ◽  
...  
Keyword(s):  
Systematic Review ◽  
Meta Analysis ◽  
Three Dimensional ◽  
Qualitative And Quantitative Analysis ◽  
Pulp Chamber ◽  
Qualitative And Quantitative ◽  
Operating Field ◽  
Gutta Percha ◽  
Single Use ◽  
Dental Burs

Endodontic treatment consists of different working procedures, such as the isolation of the operating field, pulp chamber access, and cleaning and shaping phases with at last the need of a three-dimensional filling of the canals. Each step requires a series of single-use or sterilizable instruments. We have performed a systematic review of different sterilization and disinfection procedures aiming at drawing up a disinfection and sterilization procedure to be used on endodontic instruments. A search on PubMed and Scopus was carried out using the following keywords: “endodontic sterilization,” “endodontic autoclave,” “decontamination dental bur,” “sterilization dental burs,” and “gutta-percha points sterilization.” Eligible articles were included in the qualitative and quantitative analysis. Results of the meta-analysis showed that the most effective method in sterilization is autoclaving. The qualitative analysis showed that the use of single-use or first-use instruments requires presterilization or sterilization procedures, and for reusable tools, attention must be paid to the removal of debris deposited on the blades, not easy to remove manually.

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