【摘要】 O₂/CO₂富氧燃烧发电技术被认为是未来最具潜力的燃煤低碳电力技术,近年来国内外都得到了快速发展。由于O₂/CO₂富氧燃烧条件下锅炉烟气组份发生了很大变化（以CO₂+H₂O为主）,煤灰在富氧燃烧锅炉炉内的沾污、沉积行为也将发生较大变化。为此,在3 MWth煤燃烧热态试验平台上对比研究了煤在空气燃烧和O₂/CO₂富氧燃烧条件下灰的沾污沉积特性。研究结果表明:煤在空气燃烧和O₂/CO₂富氧燃烧条件下各受热面沉积灰样的化学组成并没有显著变化,富氧燃烧条件下沉积灰样中SO₃和Fe₂O₃发生了富集,而Si₂O和Al₂O₃的含量相对偏低,O₂/CO₂富氧燃烧条件下沉积灰样的煤灰熔融温度其在比空气燃烧条件下的煤灰熔融温度约低200℃。更多还原

【Abstract】 Oxy-fuel combustion technology is one of the most potential low carbon emission technologies for thermal power plant in the future.Because the environment in oxy-fuel combustion boiler is quite different from that in air combustion boiler where CO₂ and H₂O mainly in the flue gas,the ash fouling and deposition problems is potentially different from the conventional air-firing condition.In this paper,the ash deposition behaviors were studied in a 3 MWthpilot-scale plant under both oxy-fuel and air combustion conditions.The results show that,the oxy-firing ash compositions in flue gas are not remarkably different from that under air combustion condition,but the higher content of SO₃ and Fe₂O₃ and lower content of SiO₂ and Al₂O₃ are concentrated in the oxy-firing case.The ash fusion temperature of oxyfiring fly ash was found to be around 200 ℃lower than the air case.更多还原