典型吹管工艺在超临界直流炉上的实践对比

为提高超临界直流炉蒸汽吹管工艺的质量,确保新建火电机组能够长期稳定地安全运行,在2个不同引进技术制造的在建600MW超临界直流炉的实际吹管过程中进行了蓄能法和降压法2种蒸汽吹管工艺的对比研究,总结了技术要点。根据炉型II稳压吹管过程中的实际压力、负荷及设计参数进行了模拟计算,分析了蒸汽流量、干度、过热度、比容等参数对吹管系数的影响。结果表明:在采用稳压转干态一段法工艺的基础上,尽可能提高给水流量及过热度可确保超临界直流炉蒸汽吹管质量。

Practical comparison of typical steam-blowing technologies On supercritical once-through boiler

Dropping-pressure and stable-pressure methods are two typical boiler steam-blowing technologies. In order to improve the steam-blowing quality of supercritical once-through boilers and ensure the long-term safe and stable operation of the newly-built power plants, comparative studies were made in two newly-built supercritical boilers and the key points of the steam-blowing technology was summarized. Effects of steam flow, quality of steam, superheating degree and specific volume on blowpipe coefficient were investigated by simulative calculation based on the actual pressure, load data and design parameters. Results show that the optimum steam-blowing technology for supercritical once-through boilers is the stable-pressure method with transformation to dry state. The steam-blowing quality increases with higher feed-water flow and superheating degree.