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为解决大容量锅炉煤质变化频繁,湿法脱硫系统设计裕量小、扩容工程量大、成本高等问题,在安装有炉内喷钙系统的220 t/h锅炉上进行现场试验,得出喷射位置和Ca/S对脱硫效率的影响,并结合某660 MW机组的燃烧数值模拟结果,得出喷钙脱硫的最佳高度为40.51 m左右;通过对灰成份、灰熔点、粒径分布等测定并计算得出660 MW机组加装炉内喷钙辅助脱硫系统未明显加重锅炉受热面腐蚀、积灰结渣和磨损,锅炉整体效率最多降低了0.757%,具有较好的安全经济性。研究结果,对电厂拓宽煤种适应性、增强脱硫系统可靠性、满足日益严格的排放标准等方面具有现实意义。 相似文献
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The utility boilers in China usually burn inferior coal with high ash content, so the fouling problems are more serious than that in developed countries. However, there is little information on the effects of utility boiler fouling on operating costs in China. This paper proposes a method for evaluating the costs due to utility boiler fouling in China. The fouling costs include excess heat transfer surface area, extra fuel, and maintenance costs. The excess heat transfer surface area of the 100 MW and 200 MW boilers units in Changshan Power Plant is calculated, and the results show that the excess heat transfer surface area is about 29%. This increases the investment 86,400 Yuan per megawatt unit. Based on the parameters measured in situ, a case study of a 350 MW unit in Huaneng Dalian Power Plant demonstrates that the costs due to utility boiler fouling are 10.008 billion Yuan RMB without considering the costs due to product loss, which is about 0.11% GDP of China in 2000. © 2005 Wiley Periodicals, Inc. Heat Trans Asian Res, 34(2): 53–63, 2005; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/htj.20051 相似文献
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煤中FeS2和含铁粘土矿物在锅炉结渣过程中的作用 总被引:3,自引:0,他引:3
采用 57Fe Mossbauer谱学方法并辅以 X 射线衍射分析和灰成分分析等方法 ,对取自一台 2 2 0t h锅炉的平朔煤煤粉、飞灰和结渣沉积物中的含铁成分进行了分析、测定 ,以探讨煤中 Fe S2 和含铁粘土矿物在炉内的变化和在结渣形成过程中的作用。通过煤粉和飞灰中不同成分的含铁份额的比较 ,表明在炉内 Fe S2 最终转变成氧化物 ,而含铁粘土矿物最终转变成玻璃体。对内层沉积物成分的研究表明 ,Fe S2 的炉内产物在水冷壁上的选择性沉积是初始结渣形成的主要原因 ,而含铁硅酸盐矿物的产物对初始结渣的贡献极小 ,虽然平朔煤中上述两种成分的含铁份额相差无几。 相似文献
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Gasification based biomass co-firing was an attractive technology for biomass utilization. Compared to directly co-firing of biomass and coal, it might: (1) avoid feeding biomass into boiler, (2) reduce boiler fouling and corrosion problem, and (3) avoid altering ash characteristics. In this paper, CFD modeling of product gas (from biomass gasification) and coal co-firing in a 600 MW tangential PC boiler was carried out. The results showed that NOx emission was reduced about 50–70% when the product gas was injected through the lowest layer burner. The fouling problem can be reduced with furnace temperature decreasing for co-firing case. The convection heat transfer area should be increased or the co-firing ratio of product gas should be decreased to keep boiler rated capacity. 相似文献
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针对循环流化床锅炉燃用准东煤带来的受热面结渣和沾污问题,从降低入炉煤碱金属着手,采用准东五彩湾煤掺烧不同比例的煤矸石、低钠煤、沙漠黄沙,探究不同掺烧物料及比例对锅炉受热面结渣和沾污的影响。研究结果表明:掺烧25%煤矸石时,炉内受热面沾污、结渣严重,且存在频发的爆管现象;掺烧38%艾维尔沟低钠煤时,各级受热面均比较干净,没有明显的结渣沾污现象,但锅炉运行成本显著增加;掺烧5%古尔班通特沙漠黄沙时,仅在一级蒸发管高温烟区出现了类似于沙子的大焦块,其余受热面均比较光滑、干净,没有结渣和沾污现象。 相似文献
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《能源学会志》2020,93(6):2409-2414
Biomass with high concentration of alkali/alkaline and silica components can lead to slagging/fouling, and sintering of the ash deposits, causing corrosion and erosion of the boilers. There are several methods to predict bed agglomeration such as slagging/fouling indexes. However, these indexes are developed to be used for coal ashes, which shows a different behaviour than biomass fuels. The aim of this work was to determine the suitable percentage of different species found in biomass blends in order to reduce the risk of slagging and sintering. We studied the ash behaviour of 24 blended biomass samples using two slagging indexes: the alkali index, and the % of bases in ashes index, and we validated these two indexes with the Bioslag test, and with the Hardness Index (%D1). There is low risk of slagging in most of the samples, as well as a low sintering risk. However, some samples present moderate risk of sintering possibly due to SiO2. The Bioslag test and the %D1 test support our results. Samples showing risk of sintering exceed 25% of the total accumulated ash weight percentage ac%_1P>25%, and show a hardness of %D1 > 0.7. These validations can be considered as useful tools for estimating slagging and sintering of woody biomass fuels in domestic pellet boilers. 相似文献
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珠海发电厂燃煤锅炉印尼煤掺烧运行特性与优化 总被引:3,自引:0,他引:3
介绍了珠海发电厂700 MW机组锅炉掺烧印尼煤的试验情况.针对印尼煤高挥发分、高水分、低灰分、热值较低的特性,提出了切实可行的掺烧措施.重点分析了珠海发电厂锅炉在掺烧印尼煤时对制粉系统安全运行、锅炉结渣、主要辅机运行情况等方面的影响,提出了掺烧印尼煤应注意的问题.同时在试验和运行结果分析基础上,采用遗传算法对珠海发电厂印尼煤掺烧进行优化.通过研究为锅炉多煤种掺烧积累了经验,扩大了锅炉燃煤的适用范围. 相似文献
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燃煤电站锅炉飞灰含碳量偏高的原因分析与解决措施 总被引:4,自引:0,他引:4
在燃煤电站锅炉中 ,当煤粉不能进行完全燃烧时 ,将造成飞灰含碳量的升高。从煤粉细度、煤种特性、燃烧器的结构特性、热风温度、炉内空气动力场和锅炉负荷等方面分析了对飞灰含碳量变化的影响机理 ,指出了飞灰含碳量升高所造成的影响 ,并提出了维持锅炉稳定燃烧 ,降低飞灰含碳量 ,提高锅炉效率的有效措施。 相似文献