基于再热器管屏流量偏差调整的再热汽温提升技术研究  

Research on Reheat Steam Temperature Improvement Technology Based on Flow Deviation Adjustment of Reheat Tube Screen

作　　者：罗志洪 谢佼 席伟 董孟孟 范丞龙 LUO Zhihong;XIE Jiao;XI Wei;DONG Mengmeng;FAN Chenglong

机构地区：[1]国能安顺第二发电有限公司,贵州安顺562103

出　　处：《电力系统装备》2024年第8期58-59,68,共3页Electric Power System Equipment

摘　　要：文章针对安顺公司4号炉再热汽温偏低的问题,提出了一种基于再热器管屏流量偏差调整的再热汽温提升技术方案。通过自主设计,对再热器系统受热面每屏管排连接方式进行优化改造,解决流量分配不均导致的热偏差问题,以提高再热蒸汽温度的均匀性。改造后,低再四级与五级的连接方式调整使得流量分配更为均匀,节流圈尺寸的调整进一步减小了同屏各管之间的热偏差。改造后的机组启动运行数据表明,再热汽温由改造前的平均528.8℃提升至532~538℃,煤耗节约了约0.70 g/kW·h,锅炉壁温和两侧烟温差均保持在安全范围内。通过定量分析与模拟验证,证实了技术方案的有效性。The article proposes a technical solution for increasing the reheated steam temperature based on adjusting the flow deviation of the reheater tube screen to address the issue of low reheated steam temperature in Anshun Company's No.4 boiler.Through independent design,the connection method of each screen tube row on the heating surface of the reheater system is optimized and modified to solve the problem of thermal deviation caused by uneven flow distribution,in order to improve the uniformity of reheated steam temperature.After the renovation,the connection method between the fourth and fifth stages of the low and medium flow was adjusted to make the flow distribution more uniform,and the adjustment of the throttle ring size further reduced the thermal deviation between the tubes on the same screen.The start-up operation data of the renovated unit shows that the average reheated steam temperature has increased from 528.8℃before the renovation to 532-538℃,saving about 0.70 g/kWh of coal consumption.The temperature difference between the boiler wall and the smoke on both sides has been maintained within a safe range.The effectiveness of the technical solution has been confirmed through quantitative analysis and simulation verification.

关 键 词：再热器管屏 流量偏差 再热汽温 

分 类 号：TM621.2[电气工程—电力系统及自动化]