Study on Co-oxidation of Gaseous Elemental Mercury of Coal-fired Flue Gas by Wastewater Injection
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摘要: 在热态燃煤试验炉上,利用OHM法、氢化物发生-电感耦合等离子体原子发射光谱(HG-ICP-AES)法,研究了原煤燃烧气态单质Hg(Hg0)、气态二价Hg(Hg2+)及颗粒态Hg(Hgp)分布特性,废水中Cl与Na浓度、烟气中SO2与NO对Hg0的氧化影响。结果表明,试验燃煤F、Cl浓度低,1#和2#燃煤烟气中Hg0占输入总Hg(HgT)比例分别为68.3%和80.6%,而Hg2+比例仅占22.2%和13.1%;在烟气中喷射丙烯酸钠和萘磺酸钠废水的液气比为0.028 L/m3时,1#和2#燃煤烟气Hg2+所占比例分别达到80%和75%以上,而HgP的比例变化不显著;当喷射废水液气比为0.028 L/m3时,1#和2#燃煤的SO2浓度下降11.4%~15.7%和12.2%~17.7%,促进了Cl对Hg0的氧化;而NO对Hg0的氧化不显著。Abstract: The Hg0, Hg2+ and Hgp distribution of coal-fired flue gas was investigated by the OHM and hydride generation-inductively coupled plasma atomic emission spectrometry (HG-ICP-AES) method. The impacts of chlorine and sodium content of wastewater and SO2 and NO concentration of flue gas on Hg0 oxidation were tested on the coal-fired test furnace in hot state. The results showed that the ferrous and chlorine content in the test coal was low and the ratio of Hg0 to HgT was 68.3% and 80.6% for coal-fired flue gas 1# and 2# respectively, while Hg2+ ratio was only 22.2% and 13.1% respectively. When the sodium acrylate and naphthalene sulfonate wastewater liquid to flue gas ratio was 0.028 L/m3, the Hg2+ ratio reached higher than 80% and 75% in coal-fired flue gas 1# and 2# respectively. While, there were no significance variations for Hgp ratio in flue gas. When the wastewater liquid to flue gas ratio was 0.028 L/m3, the SO2 concentration decreased by 11.4%-15.7% and 12.2%-17.7% for coal-fired flue gas 1# and 2# respectively, which accelerated Hg0 oxidation. There was no significant effect of NO in flue gas on Hg0 oxidation.
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Key words:
- sodium acrylate /
- naphthalene sulfonate /
- chlorine /
- sodium /
- Hg0 /
- oxidation /
- coal-fired flue gas
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