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A novel lignite pre-drying system with low-grade heat integration for modern lignite power plants

ISSN号：1001-6538
期刊名称：Chinese Science Bulletin
时间：2014
页码：4426-4435
分类：TQ051.892[化学工程] TM621.2[电气工程—电力系统及自动化]
作者机构：[1]School of Power, Energy and Mechanical Engineering, North China Electric Power University, Beijing 102206, China
相关基金：supported by the National Major Fundamental Research Program of China(2011CB710706);the National Natural Science Foundation of China(51025624);the Fundamental Research Funds for the Central Universities(2014ZD04,2014XS35)
相关项目：热力学，节能理论与技术，先进能量系统

关键词：干燥系统, 发电厂, 热集成, 褐煤, 低品位, 流化床干燥器, 干燥方法, 干燥过程, Lignite pre-drying, Coal-fired powerplant, System integration, Thermodynamic analysis, Economic analysis

中文摘要：

褐煤预先弄干过程在现代褐煤发电厂起一个重要作用，有内部热利用的使流体化的床干衣机是有高效率和划算的一个有希望的弄干方法。在进行预先弄干的典型褐煤的深入的分析以后发电厂，这个工作建议新奇褐煤预先弄干有低档热集成的系统。通过系统集成，当从烟道气体的剩余热被用来加热 feed 或压缩时，褐煤的低温度的蒸发被恢复加热燃烧空气水，从而从蒸气节省热的部分高、中间的压力汽轮机流血。的结果一 1,000 ? MW 开火褐煤的发电厂显示出那，建议预先弄干的系统能在约 3.6 的网植物效率产出增加 ? 在 $1.83/ 的电的费用的 % 点和减小(MW ? h ) 。热力学、经济的表演是到存在的那些的每上级预先弄干的系统，信服地证明这的研究糊可以提供一答应综合褐煤预先弄干方法为开火褐煤的发电厂下一代。

英文摘要：

The lignite pre-drying process plays an important role in modern lignite power plants and the fluidized bed dryer with internal heat utilization is a promising drying method which has both high efficiency and cost-effectiveness. After conducting an in-depth analysis of a typical lignite pre-drying power plant, this work proposed a novel lignite pre-drying system with low-grade heat integration. Through system integration, the low-temperature evaporation of the lignite was recovered to heat the combustion air, while the residual heat from the flue gases was used to heat the feed or condensed water, thereby saving a portion of heat from the steam bleeds of the high and intermediate pressure turbines. The results for a 1,000 MW lignite-fired power plant showed that, the proposed pre-drying system could yield an increase in net plant efficiency of approximately 3.6 % points and a reduction in the cost of electricity of $1.83/（MW h）. The thermodynamic and economic performances were each superior to those of the existing pre-drying system, convincingly demonstrating that the research of this paper may provide a promising integrated lignite pre-drying method for the next-generation of lignite-fired power plants.

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