铜及氧化铜对煤燃烧过程多环芳烃排放的影响
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摘要: 在实验管式炉上研究了金属铜和氧化铜对烟煤燃烧过程中PAHs生成的影响。采用气相色谱分析PAHs。实验结果表明，铜会促进PAHs的生成，而且主要是促进中高分子量PAHs的生成，这是由于铜为PAHs的合成提供了大量的活性反应中心。另一方面氧化铜对PAHs的合成和裂解具有双重催化效果，从而显著增加了中分子量PAHs的排放。在800 ℃以下，添加铜和氧化铜都减小了PAHs排放的毒性当量。在900 ℃以上，添加铜增大了PAHs排放的毒性当量。添加氧化铜时与添加铜时的规律类似，但是在1100℃以上，PAHs排放的毒性当量要比不添加时小。Abstract: The influence of metal copper and cupric oxide additive on Polycyclic Aromatic Hydrocarbons (PAHs) emissions during combustion of bituminous coal was investigated in experimental tube furnace. GC was adopted to analyze PAHs. The results indicate that copper and cupric oxide additive promote PAHs formation, especially for MMW-PAHs (moderate molecular weight PAHs) and HMW-PAHs (high molecular weight PAHs). This phenomenon can be explained by that copper additive offers a lot of active reaction centers for PAHs' synthesis. Because of the dual catalysis of cupric oxide additive, MMW-PAHs emissions remarkably increase. The TEQ (toxicity equivalence quantity) of PAHs emissions is decreased by copper and cupric oxide additive below 800 ℃. Above 900 ℃, the TEQ of PAHs emissions is increased by copper additive. The similar phenomenon has occurred when cupric oxide is added.
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Key words:
- copper /
- cupric oxide /
- bituminous coal /
- combustion /
- PAHs
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