Development and application of coke oven gas spraying on sinter bed
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ORIGINAL PAPER
Development and application of coke oven gas spraying on sinter bed He‑ping Li1,2 · Sheng‑li Wu1 · Zhi‑bin Hong1 · Heng Zhou1 · Ming‑yin Kou1 Received: 28 April 2019 / Revised: 18 September 2019 / Accepted: 22 September 2019 © China Iron and Steel Research Institute Group 2020
Abstract The Shanghai Meishan Iron and Steel Co., Ltd. has a large supply of coke oven gas (COG) and has the potential to develop and apply the spraying of COG on the surface of a sinter bed. The effects of the amount of COG, the spraying time, and the spraying distribution with the process on the quantity and quality indexes of sinter were investigated in the laboratory experiments. The results showed that the COG spraying can improve the sinter indexes to a large extent if appropriate parameters were used. It was found that an appropriate amount of COG, a relatively long spraying time, and a decreasing distribution of the COG amount with the spraying process all help to obtain a better performance for sinter quantity and quality indexes. When the COG spraying was applied to the No. 3 sintering machine, the sinter tumbler index increased by 0.45%, the overall finished product rate increased by 0.72%, the solid fuel consumption decreased by 4.06 kg/t, the reducibility increased by 3.89%, and the cost of iron decreased by 5.29 CNY/t, and the C O2, SO2 and NOx emissions also decreased, thus proving the feasibility of this technology. Therefore, COG spraying provides a new way to improve sinter and also decrease the energy consumption and pollution. Keywords Coke oven gas spraying · Sinter index · Spraying distribution · High quality · Low energy consumption · Low pollution
1 Introduction Iron ore in China is characterized by its low grade, high impurity content, and low exploitable reserve [1]. The external dependence of Chinese steel enterprises on foreign iron ore is more than 50% [2]. However, the quality of imported iron ore has become worse in recent years, which has a negative impact on the improvement of sinter quantity and quality. Meanwhile, as the main contributor to energy consumption and pollution in steel enterprises, the sintering process accounts for about 8.3% of the total energy consumption [3]. The C O2 emissions from sintering and blast furnace processes account for more than 87% of total emissions [4]. * Sheng‑li Wu [email protected] * Ming‑yin Kou [email protected] 1
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Ironmaking Plant, Shanghai Meishan Iron and Steel Co., Ltd., Nanjing 210039, Jiangsu, China
2
The SO2 and NOx emissions from sintering gas account for 40%–60% and 50%–55% of the steel enterprises’ emissions, respectively [5]. Therefore, it is necessary to develop a new high-quality sintering technology with low energy consumption and low amounts of pollution [6–13]. The sintering process has the following three characteristics: (1) The heat source comes from one point and the heat accumulates autom
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