摘要
提出了一种基于炉烟干燥及水回收风扇磨仓储式制粉系统的高效褐煤发电技术,并以某在役600MW超临界褐煤(全水分39.5%)机组为对比工程,对应用炉烟干燥及水回收仓储式制粉系统的安全性、节能性及水回收效益进行了计算比较和分析讨论。结果表明:该技术可降低机组标煤发电煤耗10 g/(kW h)左右,同时锅炉岛投资有所减小,厂用电基本不变;通过高湿制粉乏气的冷却,可回收大量原煤中水资源,若将其用于补充电厂水耗,有望实现"零水耗"褐煤电厂;以惰性烟气为制粉系统干燥剂,解决了困扰燃褐煤机组安全运行的制粉系统爆炸问题;在实现上述效果的同时,未产生新的污染物排放。该技术工艺及设备成熟,工程可行性佳;而且与以提高蒸汽参数为主要思路的超临界、超超临界、二次再热及700℃发电技术均可组合应用。该技术对加快褐煤产区电源基地建设和改善当地生态环境具有重大社会意义和显著经济效益,是值得深入研究与推广应用的绿色高效燃煤发电技术。
This paper advanced an efficient lignite-fired power generation technology based on open pulverizing system with flue gas drying fan mill and recovery of heat and water from pulverizing exhaust.In order to demonstrate the security,energy saving and water recovery advantages of this new technology,a detailed comparative calculation and analysis was performed by comparison with an operating 600 MW power generating unit which fired Chinese lignite with total moisture 39.5% and applied traditional direct-fired pulverizing system.The calculation results show that the gross standard coal consumption rate could be reduced about 10 g/（kW·h） by applying this new technology,meanwhile the investment of boiler island could be slightly reduced and the service power remained unchanged on the whole.On the other hand,a mass of water resource could be recovered from lignite by cooling the high moisture pulverizing exhaust,so that it＇s possible to realize a lignite-fired power plant with zero water consumption if those recovered water was used as make-up water for power plant.Moreover,due to the inert dryer composed of hot and cool flue gas,the long-standing security problem of pulverizing system explosion often occurred in lignite-fired power plants could be avoided by this new technology.Additionally,no extra pollutant emission resulted from this new technology as the foregoing advantages were performed.From the perspective of engineering applications,the technology processes and the relevant facilities of this technology are matured in nowadays coal-fired power plants,and this new technology can be easily assembled with those coal-fired power generation technologies with a view to heighten steam parameters,such as supercritical pressure,ultra-supercritical pressure,double reheat and 700℃ thermal power plant,etc.So it＇s a green and efficient lignite-fired power generation technology to be worthy of further research and application,for the marked environmental and economic benefits of lignite region.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2013年第5期13-20,11,共8页
Proceedings of the CSEE
关键词
褐煤
发电技术
锅炉
开式制粉系统
水回收节能
lignite power generation technology boiler open pulverizing system water recovery energy saving
