共查询到19条相似文献,搜索用时 109 毫秒
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烟囱冒黑烟是燃烧恶化的一个重要标志.就超临界直流燃煤锅炉燃油工况冒黑烟这一问题,从各方面分析燃烧恶化的原因,根据实际经验总结出减少黑烟的燃烧调整方法和对启动油枪根部风的设计提出改选意见. 相似文献
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锅炉气化小油枪点火稳燃技术在300MW机组上的应用 总被引:1,自引:1,他引:0
介绍气化小油枪点火及稳燃技术的工作原理、系统构成和改造方案,针对该技术在大唐江苏徐塘发电有限责任公司4台300MW机组上的应用情况,阐述锅炉气化小油枪点火稳燃技术的优势。实践表明,锅炉气化小油枪点火稳燃技术是一种能应用于电站大型锅炉启动、停止以及低负荷稳燃的新型节油技术,具有显著的经济效益和社会效益。 相似文献
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针对现有切圆燃烧角部风箱锅炉采用微量油直接点火水平浓淡煤粉燃烧技术时,锅炉两个角的油枪(双炉膛锅炉中是4个角的油枪)受空间的限制只能布置在淡煤粉气流侧而无法实现锅炉有效点火以及节约燃料油潜力没有充分发挥的问题,研发了可换向百叶窗煤粉浓缩器。该浓缩器结构简单,易于调节,可在锅炉运行过程中改变浓淡煤粉气流方向,实现锅炉正常点火启动并节约燃油。采用数值模拟方法对可换向百叶窗煤粉浓缩器结构进行了优化,并确定了结构优化方案。对某电厂300MWe锅炉下层煤粉燃烧器改造后的一次风喷口速度分布进行了测量,在点火启动工况和正常运行工况下,双向浓淡风量比满足设计要求,验证了可换向百叶窗煤粉浓缩器的可靠性。 相似文献
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国产600MW锅炉微油点火改造实践与思考 总被引:2,自引:2,他引:0
文章介绍了天津大唐国际盘山发电有限责任公司600MW机组#3锅炉微油点火系统的改造实践。本次小油枪微油点火改造将四套微油点火燃烧器安装在B层一次风喷口位置,取代原有的主燃烧器,作为锅炉微油点火燃烧器和主燃烧器使用,满足锅炉启停或低负荷稳燃的要求。微油点火系统由气化油枪点火系统、煤粉燃烧系统、控制系统、辅助系统四部分组成。由于此次改造的燃油系统、压缩空气系统、周界风冷却系统、送粉系统等均取自锅炉原有的系统、管路,改造量小,系统简单可靠。通过相应的控制系统DCS改造能够实现控制系统对点火系统和送粉系统进行控制与保护。由改造后首次冷态启动的实例分析,得出了节油率达到93%以上的结论,节油效果较为明显。在文章最后又对使用过程中存在的诸如冷炉点火燃烬率差、磨煤机不能满足低出力运行、尾部二次燃烧等实际问题进行了深入分析并提出了有效的改进措施。 相似文献
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用FLUENT软件对微油气化点火燃烧器的内部燃烧特性进行了三维流动数值模拟,模拟计算并分析比较了单双侧油枪的燃烧特性和油枪结构由圆管改成渐缩管后的燃烧效果。模拟结果表明,把点火油枪由原来的单侧改成双侧、把油枪结构由圆管改成渐缩管后,效果更好,有利于煤粉的快速着火燃烧。 相似文献
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A start-up ignition burner has been proposed to reduce oil fuel consumption during the firing-up process and partial-load operation. To investigate the influence of different excess air ratios on bituminous coal combustion in the start-up ignition burner, full-scale reacting-flow experiments were performed for an experiment setup. The ignition burner was identical to that normally used in an 800 MWe utility boiler. Gas temperature distributions in the burner were obtained for excess air ratios of 0.56, 0.75, 0.98 and 1.14 (corresponding to primary air velocities of 17, 23, 30 and 35 m/s). Coal burnout and the release of C and H were observed at the exit of the burner nozzle. Gases such as O2 and CO were measured at the center of the burner. A change in resistance was obtained within the burner. 相似文献
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为减少锅炉点火和助燃用油,结合W型火焰锅炉燃烧系统的设计特点和运行耗油情况,在不改变主燃烧器结构形式的前提下,吸取等离子点火技术、少油点火技术和微油点火技术的优点,将原油枪的普通喷嘴改造为高效的油汽双旋流联合雾化油喷嘴、采用邻炉提供冷炉制粉热风和提高锅炉底部加热能力等技术措施实现锅炉启动采用以煤代油方式升温升压,减少了大量燃油消耗,具有推广价值和明显经济效益。 相似文献
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介绍了为减少煤粉锅炉启动用油,将少油点火与百叶窗水平浓淡煤粉燃烧器结合,并且应用在一台600MW的锅炉上的设计、试验和应用情况。点火小油枪的布置位置没有按照传统作法布置在下一次风口内,而是将其放置在紧邻下一次风口的二次风口中,以避免其因磨损而失效。利用水平浓淡燃烧的特点,将小油枪火焰尽量冲向浓侧煤粉气流,以便尽可能充分混合。试验表明,这种技术能够可靠地点燃煤粉并稳定燃烧,取得了显著的节油效果。此外,由于每支小油枪都配有专门的火焰检测器,而且并入了FSSS系统,使设备运行安全可靠。 相似文献
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Catalytic self-ignition of methanol over platinum supported on anodized alumina in a microburner is demonstrated. The effects of air flow rate and air/methanol ratio on the system start-up time and steady state temperature have been studied. The air flow rate strongly affects the system start-up time. However, at the same flow rate, the start-up time is not affected by the air/methanol ratio over the range studied. Computational fluid dynamics simulations confirm these experimental findings. It is proposed that high flow rates and relatively lower fuel content can lead to attaining steady state faster with minimal fuel utilization. Transient axial temperature profiles showed that the hot spot of the reaction started at the inlet of the burner and did not shift downstream with time under most reaction conditions. The burner effective thermal conductivity was increased using copper thermal spreaders on the burner outer walls, allowing for thermally uniform walls. The uniform temperature profile allowed for optimal integration of the microburner with a thermoelectric device. The integrated microburner/thermoelectric device was shown to self-start from room temperature. The maximum power generated with the thermoelectric was 0.65 W and the maximum thermal efficiency was 1.1%. 相似文献
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针对大冶阳极炉重油燃烧过程中重油烧嘴出现的问题 ,分析了重油烧嘴结构的利弊因素。叙述了大冶阳极炉重油烧嘴的二次改进过程。 相似文献
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An auxiliary start-up system is required in fluidized bed combustors in order to heat the bed to a temperature at which coal fed to the bed will ignite and burn without producing excessive smoke. Four methods are used by the U.K. National Coal Board, the one selected for a particular application being dependent on the type of solid fuel used and the type of appliance. To illustrate the nature of the design calculations associated with start-up, the paper describes the principles of a mathematical model developed to determine the rating of burner required for the hot gas start-up approach. 相似文献