Fu Zhe, Zhang Shihong, Li Xiangpeng, Shao Jingai, Wang Ke, Chen Hanping
State Key Laboratory of Coal Combustion, Huazhong University of Science & Technology, Wuhan 430074, Hubei Province, PR China.
State Key Laboratory of Coal Combustion, Huazhong University of Science & Technology, Wuhan 430074, Hubei Province, PR China.
Waste Manag. 2015 Apr;38:149-56. doi: 10.1016/j.wasman.2014.12.026. Epub 2015 Feb 10.
To investigate the application prospect of MSW oxy-enriched incineration technology in China, the technical and economical analyses of a municipal solid waste (MSW) grate furnace with oxy-fuel incineration technology in comparison to co-incineration with coal are performed. The rated capacity of the grate furnace is 350 tonnes MSW per day. When raw MSW is burned, the amount of pure oxygen injected should be about 14.5 wt.% under 25% O2 oxy-fuel combustion conditions with the mode of oxygen supply determined by the actual situation. According to the isothermal combustion temperature (Ta), the combustion effect of 25% O2 oxy-enriched incineration (α = 1.43) is identical with that of MSW co-incineration with 20% mass ratio of coal (α = 1.91). However, the former is better than the latter in terms of plant cost, flue gas loss, and environmental impact. Despite the lower costs of MSW co-incineration with mass ratio of 5% and 10% coal (α = 1.91), 25% O2 oxy-enriched incineration (α = 1.43) is far more advantageous in combustion and pollutant control. Conventional combustion flue gas loss (q2) for co-incineration with 0% coal, 20% coal, 10% coal, 5% coal are around 17%, 13%, 14% and 15%, respectively, while that under the condition of 25% O2 oxy-enriched combustion is approximately 12% (α = 1.43). Clearly, q2 of oxy-enriched incineration is less than other methods under the same combustion conditions. High moisture content presents challenges for MSW incineration, therefore it is necessary to dry MSW prior to incineration, and making oxy-enriched incineration technology achieves higher combustion temperature and lower flue gas loss. In conclusion, based on technical and economical analysis, MSW oxy-enriched incineration retains obvious advantages and demonstrates great future prospects for MSW incineration in China.
为探究城市生活垃圾富氧焚烧技术在中国的应用前景，对一座采用富氧焚烧技术的城市生活垃圾（MSW）炉排炉进行了技术和经济分析，并与煤混烧进行了比较。该炉排炉的额定处理能力为每日350吨城市生活垃圾。当焚烧原生城市生活垃圾时，在氧气含量为25%的富氧燃烧条件下，纯氧注入量约为14.5 wt.%，供氧方式根据实际情况确定。根据等温燃烧温度（Ta），氧气含量为25%富氧焚烧（α = 1.43）的燃烧效果与质量比为20%煤的城市生活垃圾混烧（α = 1.91）相同。然而，在设备成本、烟气损失和环境影响方面，前者优于后者。尽管质量比为5%和10%煤的城市生活垃圾混烧成本较低（α = 1.91），但25%氧气富氧焚烧（α = 1.43）在燃烧和污染物控制方面具有更大优势。与0%煤、20%煤、10%煤、5%煤混烧时的常规燃烧烟气损失（q2）分别约为17%、13%、14%和15%，而在25%氧气富氧燃烧条件下约为12%（α = 1.43）。显然，在相同燃烧条件下，富氧焚烧的q2小于其他方法。高含水量给城市生活垃圾焚烧带来挑战，因此有必要在焚烧前对城市生活垃圾进行干燥处理，使富氧焚烧技术实现更高的燃烧温度和更低的烟气损失。总之，基于技术和经济分析，城市生活垃圾富氧焚烧具有明显优势，在中国城市生活垃圾焚烧领域展现出广阔的未来前景。
