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doi :10. 3969/j. issn. 1009 3230.2015. 06.007
应用能源技术
2015年第6期(总第210期)
新型电站锅炉暖风器系统优化分析
田鑫2,胡清"2,孙少鹏"2,朱文中"2,王光培",2
(1.华电电力科学研究院,杭州310030;2.杭州华电能源工程有限公司,杭州310030)
摘要:文章从空气预热器的运行特性出发,分析介绍了前置式液相介质空气预热器、前置式液相介质空气预热器与低压省煤器的组合系统、新型电站锅炉暖风器系统的运行特性,并对这三种系统进行了对比分析。得出以下结论:新型电站锅炉暖风器系统冬季工况下可作为暖风器使用,防止空预器出现积灰及低温腐蚀问题,且可部分回收烟气余热,夏季工况下则可实现烟气余热的深度回收;控制合理的热媒水流量,系统不存在低温腐蚀问题。
关键词:空气预热器;前置式;新型电站锅炉暖风器系统;烟气余热回收;低温房蚀中图分类号:TK229.3
文献标志码:B文章编号:1009-3230(2015)06-0032-04
TheOptimizationAnalysisof theNewSystemof theAirHeater
in the Utility Boiler
TIAN Xin'-2, HU Qing'-2, SUN Shaopeng2,ZHU Wenzhong-2, WANG Guangpei'-2
(1.Huadian Electric Power ResearchInstitute,Hangzhou310030,China; 2. Hangzhou Huadian Energy Engineering Institute,Hangzhou 310030, China)
Abstract: From the operating characteristics of the air preheater, this article introduced and analyzed the operating characteristics of the front loading air preheater with liquid mediator and the combined system with the low pressure coal feeder, and the new system of the air heater in the utility boiler. The characteristics of these three systems were analyzed comparatively.The results showed that: during the winter condition, the new system about the air heater in the utility boiler could be used as the air heater, preventing the air preheater from the low temprature corrision, meanwhile the new system can recovery the fuel gas heat; during the summer condition, the new system can achieve the deeply heat recovery of the fuel gas, Viaing the flow rate control of the medium water, the system has no low temprature corrision problem.
Key words: Air preheater; Front loading: New system of the air heater in the utility boiler; Fuel gas heat recovery; Low temprature corrision
0引言
空气预热器是将锅炉尾部的烟气预热进人锅炉前的空气的热交换器。其主要作用是利用烟气热量加热进人锅炉的空气,以提高锅炉换热效率,降低锅炉的能量消耗")。空气预热器的运行效果对机组的安全稳定运行具有重大影响。
收稿日期:20150428修订日期:201505-11
作者简介:田鑫(1979-),男,博士研究生,毕业于重庆大学
动力工程学院,工程热物理专业。
万方数据
但由于空预器进口为常温空气,其风温较低,由此带来换热器的运壁温很低,换热器易出现低温酸腐蚀以及堵灰等问题,带来运行阻力增大、风机功率增大等问题,最终导致厂用电增加,系统的热经济性降低。这些问题在燃用劣质煤种及高灰分的煤种时尤为严重,大大降低锅炉负荷、缩短空预器的使用寿命,对电厂锅炉的安全稳定运行带来重大威胁[2-5]。
为解决空预器存在的的上述运行问题,国内外的很多电厂都为机组配备了暖风器系统。暖风