A Novel Method of Combined Desulfurization and Heat Utilization of Low-Temperature Flue Gas from Hot Blast Stove for Blast Furnace: Laboratory Research and Industrial Application
SSRN, ISSN: 1556-5068
2023
- 44Usage
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Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
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Article Description
To address the challenges of low waste heat utilization rate and high desulfurization cost of flue gas from hot blast stove for blast furnace, this work proposes a novel method of combined desulfurization and heat utilization of low-temperature flue gas from hot blast stoves. This method utilizes the low-temperature flue gas from the hot blast stove to dry coke and achieves flue gas desulfurization while drying coke. Laboratory research shows that flue gas flow rate, flue gas temperature, and drying time effect on coke drying rate, with flue gas flow rate and drying time having a more significant impact on coke drying rate and flue gas temperature having a more minor impact on coke drying rate. The flue gas desulfurization rate is related to the moisture content of wet coke and the initial SO2 concentration in the flue gas. When the moisture content of wet coke increases and the initial SO2 concentration in flue gas decreases, the desulfurization rate becomes large. The reason why the wet coke in the drying process can desulfurize is that the water vapor from wet coke reacts with SO2 and oxygen in the flue gas to form sulfuric acid, which reduces the SO2 concentration in the final flue gas. The coke powder produced in the coke drying process can adsorb SO2 due to its large specific surface area to further desulfurize. In the coke drying process, coke has no adsorption effect on SO2, and SO2 gas is not retained in the coke. After the industrial application of this method, the outlet flue gas temperature is reduced from 175 °C to 60 °C, and the SO2 concentration in the outlet flue gas is reduced from 150 mg/m3 to 29 mg/m3, reaching the ultra-low emission standard of the Chinese steel industry (<50 mg/m3). The total SO2 reduction rate of this method reaches 80.67%.
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