赵 明,宋云华
(1. 广州珠江电力有限公司,广东 广州511457; 2. 广州发展电力集团有限公司,广东广州510623)
300 MW燃煤锅炉制粉系统改造技术研究
赵明1,宋云华2
(1. 广州珠江电力有限公司,广东 广州511457; 2. 广州发展电力集团有限公司,广东广州510623)
摘要:针对某燃煤电厂300 MW中速磨煤机直吹式制粉系统,通过采用制粉系统、一次风系统与空预器系统联合设计与改造的方式,提高制粉系统对煤种的适应性以及制粉系统出力,改造过程中通过设备选型分析及校核计算、冷态动力场试验、磨煤机性能试验及锅炉优化燃烧调整,使制粉系统改造达到了预期效果。试验结果表明:在锅炉效率保持不变的前提下,制粉系统、一次风系统与空预器系统联合改造后磨煤机出力得到有效提高,机组对煤种的适应能力得到显著增强,同时系统改造后有效提高了一次风机裕量以及热一次风温,减少磨煤机设备维护、取得了较好的经济和安全效益。
关键词:制粉系统;煤种适应性;燃煤成本;效益
中图分类号:TK223
文献标识码:A
DOI:10.3969/j.issn.1672-0792.2015.04.013
收稿日期:2015-02-03。
作者简介:赵明(1982-),男,工程师,主要研究方向为火力发电技术及节能技术应用,E-mail:kimming1982@126.com。
Abstract:In this paper, we focus on the research of a 300 MW medium speed mill pulverizing system. Through the joint design and transformation of milling system, primary air system and air pre-heater system, we improved coal adaptability and output of the pulverizing system. During the transformation process we also did some equipment selection analysis and checking calculations, cold dynamic field tests, mill performance tests and the boiler combustion optimization, finally the result met our expectations. The result showed that: In the context of unchanged boiler efficiency, the milling system, primary air system, air pre-heater system and mill output had been effectively improved, and the unit coal adaptability had been significantly enhanced. At the same time, after the transformation, the primary fan margin and the primary air temperature were significantly improved, and the mill equipment maintenance was reduced. Finally we got good economic and safety benefits.
Keywords:pulverizing system; coal adaptability; cost of coal; benefits

0引言
近年来,随着电力总装机容量的快速增长,煤炭市场供需发生显著变化,锅炉燃煤煤质波动大,大量电站锅炉实际燃用煤种严重偏离原设计煤种,导致在机组运行过程中出现了一系列问题,如锅炉燃烧不稳定、燃烧飞灰含碳量高、锅炉经济性差,炉膛结渣等问题,与此同时由于入炉煤种变化显著,导致原设计的制粉系统发生诸多突出问题,如磨煤机出力不足,一次风量及风温不够,显著影响了机组带负荷能力和运行安全性[1,2]。……