共查询到19条相似文献,搜索用时 265 毫秒
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针对宁夏马莲台电站300 MW亚临界燃煤锅炉存在的结焦、结渣问题,进行了优化燃烧调整试验研究、分析了一次风、旋流强度和内外二次风配比等因素对锅炉燃烧状况的影响,提出了合理的运行工况. 相似文献
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采用现场燃烧调整试验方法,进行了机组负荷、运行氧量、二次风配风方式、磨煤机运行组合方式和煤质等因素对300 MW机组切圆燃烧锅炉NOX排放影响的试验研究。试验结果表明:氧量、负荷、煤质是NOX排放浓度的主要影响因素;而在保持大量燃尽风实现分级燃烧下,二次风配风方式对NOX排放浓度的影响较小。在燃烧调整试验研究基础上,建立了300 MW锅炉NOX排放浓度与主要运行因素的多元线性回归关系式,该关系式可用于指导锅炉NOX排放浓度的在线运行控制和预测。 相似文献
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针对某电厂1 000 MW机组锅炉存在的燃烧不均匀问题,进行了深入的燃烧优化试验,包括燃烧器配风优化,一次风量运行优化,煤粉细度调整和锅炉整体配风调整,得到了最佳运行控制曲线。在不同负荷工况下的燃烧试验表明,燃烧优化后,风机电耗下降,NOx排放量下降,锅炉排烟热损失及固体不完全燃烧热损失均下降,锅炉效率提高,优化效果良好。 相似文献
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煤粉浓淡燃烧方式对电站锅炉NOx排放影响的试验研究 总被引:5,自引:9,他引:5
采用浓淡燃烧在一定程度上可以降低电站锅炉的NOx排放。该文分别在水平和垂直煤粉浓淡燃烧方式下,进行了一次风速、过量空气系数、锅炉负荷、二次风配风方式以及三次风量等因素对电站锅炉NOx排放影响的试验。试验结果表明:在通常运行条件下,水平浓淡燃烧方式的NOx排放量低于垂直浓淡燃烧方式的NOx排放量。 相似文献
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为提高锅炉运行安全与经济性,某电厂600 MW空冷机组进行了燃烧调整试验。详细研究了一次风配风均匀性、制粉系统挡板特性、运行氧量和燃尽风率对锅炉效率的影响。结果表明:煤粉随着分离器挡板开度增大和一次风量增加逐渐变粗;随着氧量降低,锅炉效率逐渐增大,额定负荷下氧量保持在3.0%左右最佳;随着燃尽风率降低,锅炉效率逐渐增大,NOx排放浓度逐渐增加。综合考虑锅炉效率、NOx排放浓度和屏过管壁金属温度,额定负荷下燃尽风挡板开度保持在75%左右最佳,此时NOx质量浓度为385.1 mg/Nm3。通过燃烧调整,锅炉效率提高0.45个百分点,调整后锅炉效率在93.15%以上。 相似文献
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潮州电厂1000Mw超超临界压力机组在投产初期存在一些不完善的逻辑,如机组在协调方式下锅炉主控指令与机组实际负荷指令相差较大、一次风压设定不合理等。针对这些问题进行整改,经过实际变负荷试验的检验和优化,改造效果较为理想,提高了机组运行的安全性和经济性。 相似文献
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锅炉在低负荷下稳定燃烧能力差,严重影响锅炉的安全运行和电厂的经济效益。汉川电厂通过锅炉燃烧器改造及运行优化调整等技术措施,使300MW机组锅炉最低稳定燃烧负荷能力达到135MW,突破了制造厂的最低稳燃负荷保证值210MW,锅炉运行的可靠性提高,经济效益明显。 相似文献
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对国电宝鸡第二发电有限责任公司I期4x300MW火力发电机组锅炉一次风机运行现状进行分析,提出了从风机本体改造、采用不同运行方式2方面提高能效的思路,经实施后取得了良好的经济效益。 相似文献
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P. A. Berezinets G. G. Tumanovskii G. E. Tereshina I. N. Krylova V. N. Markina E. N. Migun 《Thermal Engineering》2016,63(12):833-840
The development of distributed power generation systems as a supplement to the centralized unified power grid increases the operational stability and efficiency of the entire power generation industry and improves the power supply to consumers. An all-regime cogeneration combined-cycle plant with a power of 20–25 mW (PGU-20/25T) and an electrical efficiency above 50% has been developed at the All-Russia Thermal Engineering Institute (ATEI) as a distributed power generation object. The PGU-20/25T two-circuit cogeneration plant provides a wide electrical and thermal power adjustment range and the absence of the mutual effect of electrical and thermal power output regimes at controlled frequency and power in a unified or isolated grid. The PGU-20/25T combined-cycle plant incorporates a gas-turbine unit (GTU) with a power of 16 MW, a heat recovery boiler (HRB) with two burners (before the boiler and the last heating stage), and a cogeneration steam turbine with a power of 6/9 MW. The PGU-20/25T plant has a maximum electrical power of 22 MW and an efficiency of 50.8% in the heat recovery regime and a maximum thermal power output of 16.3 MW (14 Gcal/h) in the cogeneration regime. The use of burners can increase the electrical power to 25 MW in the steam condensation regime at an efficiency of 49% and the maximum thermal power output to 29.5 MW (25.4 Gcal/h). When the steam turbine is shut down, the thermal power output can grow to 32.6 MW (28 Gcal/h). The innovative equipment, which was specially developed for PGU-20/25T, improves the reliability of this plant and simplifies its operation. Among this equipment are microflame burners in the heat recovery boiler, a vacuum system based on liquid-ring pumps, and a vacuum deaerator. To enable the application of PGU-20/25T in water-stressed regions, an air condenser preventing the heat-transfer tubes from the risk of covering with ice during operation in frost air has been developed. The vacuum system eliminates the need for an extraneous source of steam for the startup of the PGU-20/25T plant. The vacuum deaerator provides prestartup deaeration and the filling of the entire condensate feed pipeline with deaerated water and also enables the maintenance of the water temperature before the boiler at a level of no lower than 60°C and the oxygen content at a level of no higher than 10 μg/L during operation under load. The microflame burners in the heat recovery boiler enable the independent adjustment of the electrical power and the thermal power output from the PGU-20/25T plant. All the innovative equipment has been tested on experimental prototypes. 相似文献
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褐煤干燥对电厂经济性的影响 总被引:4,自引:0,他引:4
褐煤中水分较高,若直接用于电厂锅炉燃烧,将导致锅炉热效率和电厂净效率降低,经干燥后的褐煤燃烧对提高电厂经济性有很重要的意义.以某300MW燃煤粉锅炉机组为例,计算和分析了燃用干燥前与干燥后的褐煤时锅炉内燃烧、受热面换热、烟风系统阻力以及磨煤机出力的改变,得出褐煤干燥对锅炉热效率、燃煤量、风机电耗及制粉系统电耗的影响,对电厂燃用未经干燥及干燥后的褐煤的经济性进行了评价.燃用干燥后的褐煤不仅可大大减少入炉煤量,而且还可提高锅炉热效率,降低送、引风机及制粉系统等辅机的电耗. 相似文献
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