| 引用本文: | 吴江全,孟建强,严泰森,吴士强,孙绍增,秦明,赵义军.过量空气系数对准东煤结渣特性的影响[J].哈尔滨工业大学学报,2015,47(7):78.DOI:10.11918/j.issn.0367-6234.2015.07.013 |
| WU Jiangquan,MENG Jianqiang,YAN Taisen,WU Shiqiang,SUN Shaozeng,QIN Ming,ZHAO Yijun.Effect of excess air ratio on slagging characteristics of Zhundong coal[J].Journal of Harbin Institute of Technology,2015,47(7):78.DOI:10.11918/j.issn.0367-6234.2015.07.013 |
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| 过量空气系数对准东煤结渣特性的影响 |
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吴江全1, 孟建强2, 严泰森1, 吴士强3, 孙绍增1, 秦明1, 赵义军1
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(1.哈尔滨工业大学 燃煤污染物减排国家工程实验室, 150001 哈尔滨; 2. 中国船舶重工集团公司,201108 上海; 3. 广东省特种设备检测研究院顺德检测院,528300 广东 顺德)
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| 摘要: |
| 为深入认识准东煤的结渣特性,改善燃用准东煤的锅炉结渣问题,采用多反应控制段携带流反应器模拟真实煤粉锅炉中的空气分级燃烧情况,研究空气分级条件下过量空气系数对准东煤结渣特性的影响规律．采用XRD与SEM-EDX对灰渣在高温条件下的熔融特性与微观形貌进行分析,并取灰样分析其燃尽率．实验结果表明:准东煤在炉膛温度为1 250 ℃时具有很好的燃尽效果,燃尽率达到99％以上．过量空气系数在0.7~1.2时对燃尽效果影响不明显．随着主燃区过量空气系数的升高,莫来石含量逐渐增大,结渣逐渐减轻;灰渣中Si、Fe、Na富集明显,Al含量较低,结渣较强;主燃区过量空气系数较低时,灰中铁的硅铝酸盐容易形成低温共熔体,导致结渣加重．为避免严重结渣应该使主燃区过量空气系数大于0.7,同时可以通过掺配含铁量较低的煤来减轻准东煤的结渣． |
| 关键词: 准东煤 结渣 空气分级 过量空气系数 XRD |
| DOI：10.11918/j.issn.0367-6234.2015.07.013 |
| 分类号:TQ534 |
| 基金项目:国家自然科学基金创新研究群体科学基金(51421063). |
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| Effect of excess air ratio on slagging characteristics of Zhundong coal |
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WU Jiangquan1, MENG Jianqiang2, YAN Taisen1, WU Shiqiang3, SUN Shaozeng1, QIN Ming1, ZHAO Yijun1
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(1.National Engineering Laboratory for Reducing Emissions from Coal Combustion, Harbin Institute of Technology, 150001 Harbin, China; 2.China Shipbuilding Industry Corporation, 201108 Shanghai, China; 3.Shunde Inspection and Research Institute of Guang Dong Special Equipment Inspection and Research Institute, 528300 Shunde, Guangdong, China)
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| Abstract: |
| For a better understanding of slagging characteristics of Zhundong coal and solving its slagging problem, entrained flow reactor with multiple reaction segments was used to simulate air staging combustion condition in PC boiler. The slagging characteristics of Zhundong coal in various excess air ratio conditions was investigated, the morphology and melting characteristics and its burnout rate were analyzed using SEM-EDX and XRD. The results show that the burnout rate of Zhundong coal is more than 99％ at 1 250 ℃, and the influence of excess air ratio ranging from 0.7 to 1.0 on the char burnout is not obvious. With the excess air ratio increasing in the primary zone, the content of mullite increases, while the slagging characteristic reduces gradually. The Si, Fe, Na are enrich in slagging, while the content of Al is lower, and slagging is more serious. The aluminosilicate of iron is easy to form low temperature eutectic under lower excess air ratio, and it will cause slagging seriously. Therefore, the excess air ratio of the primary zone should be above 0.7 to avoid slagging seriously, and combustion mixed with low iron coal will reduce slagging of Zhundong coal. |
| Key words: Zhundong coal slagging air staging excess air ratio XRD |
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