Desulfurization Performances of Activated Coke Prepared from Fine Blue-Coke
2020
Tian, Yuhong | Hu, Shudi | Jing, Xian de | Xue, Juanqin | Song, Yonghui | Lan, Xinzhe
Activated coke was prepared by CO₂ activation using solid waste fine blue-coke as main raw material and coal direct liquefaction residue (DCLR) as binder. The activated coke was characterized by BET, XRD, and infrared analysis. The flue gas desulfurization experiment was carried out with a fixed bed reactor and activated coke as the adsorbent. The experimental results show that coal direct liquefaction residue pyrolysis process will produce a large number of cohesive colloids, further increasing the strength of the activated coke. BET analysis shows that there is abundant microporous structure in the activated coke, infrared analysis shows that the activated coke contains abundant surface functional groups, and XRD shows that the crystallization degree of the activated coke is high. At lower temperature, SO₂ and O₂ have competitive adsorption on the surface of activated coke, if the concentration of water vapor is too high, a water film will be formed on the surface of activated coke, which will hinder the adsorption of SO₂ by activated coke. The initial concentration of SO₂ is 700 ppm, the adsorption temperature is 80 °C, the oxygen concentration is 9%, and the concentration of water vapor is 8%. The removal of SO₂ by activated coke is better, and the desulfurization rate reaches 97%.
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