风煤比对超超临界机组变负荷瞬态特性的影响
The Influence of the Air-coal Ratio on Transient Characteristics of the Ultra-supercritical Power Unit during the Load Cycling Processes
张永 1尹朝强 2刘宇钢 2张斌 1莫春鸿 2王朝阳3
作者信息
- 1. 国能蚌埠发电有限公司,安徽蚌埠 233000
- 2. 东方电气集团东方锅炉股份有限公司,四川成都 611731
- 3. 西安交通大学动力工程多相流国家重点实验室,陕西西安 710049
- 折叠
摘要
为获得风煤比对燃煤机组变负荷瞬态调峰特性的影响规律,基于660 MW超超临界二次再热燃煤机组动态模型,研究了风煤比对主再热汽温、减温水喷水量及瞬态发电能耗的影响,提出了在不同变负荷速率下汽温控制效果和发电能效的风煤比优化控制方案.结果表明:变负荷瞬态过程中,采用较大的风煤比有利于提高主再热汽温控制效果,但瞬态过程的平均发电煤耗率高.当变负荷速率在 1%/min以内时,优先采用较小的风煤比可使机组瞬态过程平均发电煤耗率下降 1.2 g/(kW·h);当变负荷速率在 2%～3%/min时,优先采用较高的风煤比,可保证主再热汽温偏差控制在10℃以内.
Abstract
In order to study the influence of the air-coal ratio on the peak regulating characteristics of a coal-fired unit during load cycling transients,a dynamic model of a double-reheat ultra-supercritical coal-fired power plant with 660MW was established.The influence of the air-coal ratio on the live and reheat steam temperatures,the flowrates of the desuperheating water and the transient energy consumption was studied.A control scheme of air-coal ratio considering the steam temperature control effect and operational efficiency under different load cycling rates was proposed.The results show that,during the load cycling transient processes,a larger air-coal ratio benefits the stabilization of the live and reheat steam temperatures,while the average coal consumption rate of power during the transient process is higher.When the load cycling rate is equal to or less than 1%/min,a smaller air-coal ratio is preferred to reduce the average coal consumption by 1.2 g/(kW·h)during the load cycling transient process.When the load cycling rate is between 2%/min and 3%/min,a higher air-coal ratio is preferred to ensure that the deviations of the live and reheat steam temperatures can be controlled within 10℃.
关键词
风煤比/二次再热/变负荷/汽温控制/瞬态能耗Key words
air-coal ratio/double reheat/load cycling/steam temperature regulation/transient energy consumption引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据