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

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.

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Numerical Simulation of Pulverized Coal Combustion Behavior in the Traditional Blast Furnace and Oxygen Blast Furnace

TMS 2014 Supplemental Proceedings ◽

10.1002/9781118889879.ch135 ◽

2014 ◽

pp. 1133-1140 ◽

Cited By ~ 1

Author(s):

Jinzhou Liu ◽

Shiyang Zhang ◽

Xuefeng She ◽

Jingsong Wang ◽

Lin Lin ◽

...

Keyword(s):

Numerical Simulation ◽

Blast Furnace ◽

Coal Combustion ◽

Pulverized Coal ◽

Pulverized Coal Combustion ◽

Combustion Behavior ◽

Oxygen Blast Furnace ◽

Oxygen Blast

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

High Temperature Materials and Processes ◽

10.1515/htmp-2017-0141 ◽

2019 ◽

Vol 38 (2019) ◽

pp. 42-49 ◽

Cited By ~ 6

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.

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