华电技术 ›› 2019, Vol. 41 ›› Issue (6): 6-12.

• 研究与开发 • 上一篇    下一篇

中速磨煤机入口紧凑型圆形一次风道流场均流技术研究

  

  1. 1.广东粤电靖海发电有限公司,广东揭阳〓515223; 2.西安热工研究院有限公司苏州分公司,江苏苏州〓215153;3广东电科院能源技术有限责任公司,广州〓510080
  • 出版日期:2019-06-25 发布日期:2019-07-12

Study on uniform flow technology of compact circular primary air duct at mediumspeed mill inlet

  1. 1.Guangdong Yuedian Jinghai Power Generation Company Limited, Jieyang 515223, China; 2.Xi’an Thermal Power Research Institute Company Limited,Suzhou Branch, Suzhou 215153, China;3.Electric Power Research Institute of Guangdong Power Grid Corporation, Guangzhou 510080, China
  • Online:2019-06-25 Published:2019-07-12

摘要:

对某电厂1000MW机组中速磨煤机入口在线一次风量失真问题进行了流场测试分析、均流优化设计和实际应用改造,研究了适用于大尺度紧凑型圆形一次风道的流场均流技术,通过分流、导流、整流和均流优化设计,显著提升了测量截面速度分布的均匀性,消除了局部涡流区与回流区,实现了磨煤机入口风量的准确监测,风量系数偏差保持在3%以下,风门自动控制成功投入,风量稳态特性和自动控制品质良好,一次风机总电流下降50A,供电煤耗降低0.14g/(kW·h),年节约燃料成本49.8万元。

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Abstract:

To solve the inaccurate online measurement of primary air flow rate at a medium speed mill inlet in a 1000MW coal fired power plant, flow field test, uniform flow optimization and practical transformation are conducted.The research can be applied for uniform flow The technology of compact large-scale circular duct.The technology can improve the uniformity of velocity distribution at the  measurement cross section and eliminate local vortex regions and back flow regions by flow split, diversion, rectification and uniform.The accurate measurement on the primary air flow rate is achieved and the its coefficient deviation can be kept below 3%. The automatic control valve is put into practice and works well and steady.The total current of the primary air fan decreases by 50A, the coal consumption rate reduces by 0.14g/(kW·h), and the annual fuel cost declines by 498000 Yuan.

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