Distribution of reformed coke oven gas in a shaft furnace
- PDF / 584,766 Bytes
- 9 Pages / 595.276 x 790.866 pts Page_size
- 13 Downloads / 165 Views
(0123456789().,-volV)(0123456789(). ,- volV)
ORIGINAL PAPER
Distribution of reformed coke oven gas in a shaft furnace Xin Jiang1 • Jia-xin Yu1 • Lin Wang2 • Dong-wen Xiang1 • Qiang-jian Gao1 • Hai-yan Zheng1 • Feng-man Shen1 Received: 26 January 2020 / Revised: 11 March 2020 / Accepted: 12 March 2020 / Published online: 12 November 2020 Ó China Iron and Steel Research Institute Group 2020
Abstract In recent years, the reformed coke oven gas (COG) was proposed to be used as reducing gas in a shaft furnace. A mathematical model of gas flow based on the reformed COG was built. The effects of the pressure ratio of reducing gas to cooling gas (k) on the gas distribution in the shaft furnace were investigated. The calculation results show that k is an important operation parameter, which can obviously affect the gas distribution in the shaft furnace. The value of k should be compromised. Both too big and too small k values are not appropriate, and the most reasonable value for k is 1:1.33. Under this condition, the utilization coefficient of reducing gas, the utilization coefficient of cooling gas and the coefficient of upward gas are 0.94, 0.92 and 1.03, respectively. Based on the validation of physical experiments, the calculated values of the model agreed well with the physical experimental data. Thus, the established model can properly describe the reformed COG distribution in an actual shaft furnace. Keywords Direct reduction Shaft furnace Coke oven gas Gas distribution Pressure ratio Reducing gas Cooling gas
1 Introduction Direct reduction is an ironmaking method for the new era which utilizes reducing gas or non-coking coal to reduce iron ore. The product is called direct reduced iron (DRI) [1–4]. Reduction shaft furnace is an effective process to produce DRI, and it is developed worldwide, including Midrex, HYL (abbreviation of Hojalata Y Lamina, later Hylsa), etc. [5–10]. In a shaft furnace, the gas flow rate and the gas distribution through the furnace are the key factors to determine the productivity of DRI and are responsible for the efficient use of the very expensive heat and reducing gas in the furnace. Hence, many mathematical models related to the reduction shaft furnace have been reported [11–26]. The distribution of gas flow, gas temperature and gas species have been analyzed in their works. For example, Hou et al. [11] established a scaling approach by
& Xin Jiang [email protected] 1
School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China
2
Department of Mechanical Engineering, Shenyang Institute of Engineering, Shenyang 110136, Liaoning, China
123
changing process parameters to significantly reduce computational cost for the combined computational fluid dynamics (CFD) and discrete element method (DEM) modeling of moving bed reactors. Also, they investigated the thermal behavior of the gas–solid flow in a shaft furnace by a combined CFD-DEM approach, and the complicated transient gas–solid and heat transfer phenomena were demonstrated in a furnace [12, 1
Data Loading...
