共查询到19条相似文献,搜索用时 203 毫秒
1.
针对某电厂660MW机组W形火焰锅炉燃用煤种与设计煤质偏差较大、锅炉效率偏低的问题进行了燃烧优化调整试验。首先通过调整F挡板对省煤器出口氧量分布进行调平,然后从影响锅炉运行经济性的主要因素入手,结合该锅炉的特点,分析了负荷变化、二次风变化、煤质变化和C挡板开度等参数对锅炉效率的影响,指出了合理的运行工况。 相似文献
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通过锅炉燃烧调整试验,标定了二次风量、O2含量和排烟温度,进行了SOFA摆角调整对汽温偏差影响的试验,给出了SOFA风水平摆角优化运行的推荐参数。 相似文献
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介绍了无锡锅炉厂480t/h超高压再热循环流化床锅炉运行中存在的问题,对循环流化床锅炉的特点及锅炉结构特性、运行调整和锅炉检修经验等进行了总结.分析了锅炉运行工况的影响,提出了优化燃烧调整的具体方案,为锅炉的热态运行提供指导;根据锅炉的检修经验,确定锅炉检修方案和重点检修部位,优化锅炉检修,从而使锅炉达到安全、经济、高效运行的目的. 相似文献
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介绍了河南义马矸石电厂DG440/13.7-Ⅱ2型135MW循环流化床锅炉的基本状况,论述了冷态试验及锅炉点火升压、运行的过程,总结了调试中出现的问题并提出了解决方法。经燃烧优化试验调整后,锅炉连续运行能力和可靠性得到提高,可为同类型机组运行提供借鉴。 相似文献
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针对丰城二期发电厂700MW超临界机组锅炉实际燃用煤种复杂、煤质较差,导致飞灰含碳量高、锅炉效率偏低的情况,进行了变煤粉细度、变一次风量、变磨煤机组合方式等燃烧调整试验。根据试验结果对锅炉运行方式进行优化,包括合理配煤、确定磨煤机的最佳通风量、及时调整锅炉出口氧量、提高磨煤机磨辊加载油压等。优化后显著提高了锅炉效率,降低了厂用电率及飞灰含碳量,取得了良好的经济效益。 相似文献
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以华电国际莱城发电厂300 MW机组锅炉二次风控制系统为例,针对低氮燃烧要求进行了优化,根据运行过程中出现的问题,进行了二次风门执行器改造,并对改造后二次风门控制系统的控制策略进行了调整,供同类机组低氮燃烧改造时参考。 相似文献
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对姚孟发电有限责任公司300MW机组塔式锅炉灭火原因进行了分析,通过冷态动力场试验和有针对性的燃烧调整试验,找出了问题的症结所在,根据电厂的实际情况,提出了合理的运行调整方案及预防措施。实践应用结果表明,锅炉燃烧工况明显改善,未再出现过灭火故障。 相似文献
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内蒙古华电乌达热电有限公司机组因循环流化床锅炉燃烧的复杂性和特殊性,使得锅炉的燃烧系统自动控制难以正常投入,通过使用“循环流化床锅炉燃烧过程优化控制系统”,实现了480t/h级CFB锅炉燃烧自动控制,在此基础上实现了机组协调控制。 相似文献
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中国华电富拉尔基发电总厂调峰任务艰巨,锅炉低负荷运行时出现影响锅炉稳定燃烧,水冷壁水循环安全及机组厂用电高等问题,通过采取燃煤混烧,3台磨煤机与1台送风机运行,滑压运行等措施,解决了低谷时段锅炉安全、经济运行的问题。 相似文献
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华电青岛发电有限公司二期300MW机组#3锅炉投产后,存在飞灰、大渣含碳量高、空气预热器漏风量大、一次风速高、粗粉分离器堵塞、煤粉细度不够、低负荷稳燃性能差、风机抢风严重等一系列影响锅炉效率的问题。通过1年的优化试验、运行调整试验及部分设备改造,使上述问题基本得到了解决,锅炉效率有显著提高。 相似文献
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A. V. Kurochkin A. L. Kovalenko V. G. Kozlov A. I. Krivobok 《Power Technology and Engineering (formerly Hydrotechnical Construction)》2007,41(1):50-56
Special features of operation of a boiler operating as a combined-cycle plant and having its own furnace and burner unit are
descried. The flow of flue gases on the boiler is increased due to feeding of exhaust gases of the GTU into the furnace, which
intensifies the convective heat exchange. In addition, it is not necessary to preheat air in the convective heating surfaces
(the boiler has no air preheater). The convective heating surfaces of the boiler are used for heating the feed water, thus
replacing the regeneration extractions of the steam turbine (HPP are absent in the circuit) and partially replacing the preheating
of condensate (the LPP in the circuit of the unit are combined with preheaters of delivery water). Regeneration of the steam
turbine is primarily used for the district cogeneration heating purposes. The furnace and burner unit of the exhaust-heat
boiler (which is a new engineering solution for the given project) ensures utilization of not only the heat of the exhaust
gases of the GTU but also of their excess volume, because the latter contains up to 15% oxygen that oxidizes the combustion
process in the boiler. Thus, the gas temperature at the inlet to the boiler amounts to 580°C at an excess air factor α = 3.50;
at the outlet these parameters are utilized to T
out = 139°C and αout = 1.17. The proportions of the GTU/boiler loads that can actually be organized at the generating unit (and have been checked
by testing) are presented and the proportions of loads recommended for the most efficient operation of the boiler are determined.
The performance characteristics of the boiler are presented for various proportions of GTU/boiler loads. The operating conditions
of the superheater and of the convective trailing heating surfaces are presented as well as the ecological parameters of the
generating unit.
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Translated from élektricheskie Stantsii, No. 12, December 2006, pp. 26–32. 相似文献
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在降负荷时,锅炉燃烧产生的热量加上释放出的蓄热等于输出功率对应的能量。虽然机组输出的功率大于当时燃用煤质机组的最低稳燃负荷,但其中包含锅炉蓄热产生的功率,所以,锅炉燃烧产生的热量对应的功率仍然小于对应煤质的最低稳燃负荷而使锅炉灭火。分析具体原因后,给出了具体的应对措施: 相似文献
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以高温腐蚀的机理为基础,从锅炉设计参数、煤种、运行和炉内空气动力工况等方面分析了产生高温腐蚀的原因,有针对性地提出了防范措施,为解决此类问题提供参考 相似文献
19.
A. A. Smyshlyaev S. A. Evdokimov L. G. Dubovitskaya I. A. Kochetkov É. Kh. Verbovetskii 《Power Technology and Engineering (formerly Hydrotechnical Construction)》2008,42(2):93-99
The purpose of modernizing the Pp-1050-25-545 KGZh (P-50R) boiler is to reduce the emissions of nitrogen oxides (NOx) to levels consistent with modern requirements. The following engineering steps were taken, with liquid slag removal from
the boiler, to attain NOx levels of 700–750 mg/m3 for operation with coal and 125 mg/m3 for operation with natural gas
— three-stage combustion with natural gas as the reducing fuel (∼15% thermal) burning in the recirculating gases; and
— use of low-emission coal-dust burners with dust feed at high concentrations, overflow burners, and tertiary draft nozzles
to lower the amount of excess air in the active combustion zone.
The NOx level was further reduced to 570 g/m3 (just for operation with coal) by using a selective noncatalytic nitrogen oxide reduction system with injection of ammonia
(NH3) vapor into the boiler in a zone with temperatures of 950°C.
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Translated from élektricheskie Stantsii, No. 1, pp. 2–8 (2008). 相似文献