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煤的富氧燃烧技术因压缩回收CO_2过程中汞(Hg)对铝合金换热器的腐蚀或脆化问题,面临高效率的Hg脱除要求.本文利用模拟燃煤烟气,研究了200~1000℃范围内燃煤烟气组分NO和SO_2对HCl氧化Hg的影响规律,结果表明:CO_2、N_2、O_2/CO_2和O_2/N_2气氛对Hg氧化的影响不明显,总体而言,Hg在O_2/CO_2气氛中的氧化率高于CO_2气氛,略低于O_2/N_2气氛;NO与HCl共存显示了协同Hg氧化作用:Hg氧化在200~600℃显著增强,在800~1000℃有所减弱,1000℃时,Hg的氧化率随NO浓度变化存在一极小值;S02明显抑制HCl对Hg的氧化.
The oxygen-rich combustion technology of coal faces the problem of high efficiency Hg removal due to the corrosion or embrittlement of mercury (Hg) on the aluminum alloy heat exchanger during the process of compressing and recovering CO_2.In this paper, The results showed that the effect of CO_2, N_2, O_2 / CO_2 and O_2 / N_2 atmosphere on Hg oxidation was insignificant. Generally speaking, Hg was in the range of 1000 ℃ The oxidation rate in O_2 / CO_2 atmosphere was higher than that in CO_2 atmosphere, slightly lower than that in O_2 / N_2 atmosphere. The coexistence of NO and HCl showed synergistic Hg oxidation: Hg oxidation increased significantly from 200 ℃ to 600 ℃ and decreased from 800 ℃ to 1000 ℃ At 1000 ℃, the oxidation rate of Hg varies with the concentration of NO. There is a minimum value for the oxidation rate of Hg. S02 significantly inhibits the oxidation of Hg by HCl.