基于DCS的锅炉自启停技术研究与实现

Research and implementation of automatic start-up and shut-down technology in the boiler based on DCS

机组APS技术是电厂热工自动化重要发展方向之一,对机组辅助设备启动锅炉的控制方案进行优化可有效提高系统安全稳定运行水平。在此背景下,以某大型发电机组配置的启动锅炉为例,介绍该型锅炉的主要设备,分析其启停工艺,重点论述自启停控制系统框架和功能组设计等关键技术,并提出一种锅炉自启停控制解决方案。该方案在某百万千瓦级超超临界机组配置的启动锅炉中成功应用。试验结果表明:该方案不仅可以规范运行操作,还可以减少人为干预,提高电厂的自动化水平、安全运行水平。该控制方案可直接应用于同类型启动锅炉,也为其他类型工业锅炉的启停控制提供了参考。

Automatic Plant Startup and Shutdown Control System(APS)is one of latest development directions of thermal automation technology in power plants.It is necessary to optimize the control scheme of start-up boiler which is an auxiliary equipment.Taking the start-up boiler of a certain large generating unit as the research target,the major equipment of this boiler is introduced and the start-up and shut-down process of this boiler is analyzed.And the essential technical issues,including the frame of automatic start-up and shut-down control system and the design of functional group,are emphatically discussed.After that,a scheme of automatic start-up and shut-down control for the boiler is put forward.The scheme has been successfully applied to a start-up boiler in a 1000 MW ultra-supercritical unit.The real application results indicate that this scheme not only regulates operation,but also reduces the human intervention level.Both automation level and safety operation level of power plants are improved.The control scheme also provides references for the start-up and shut-down control of other types of industrial boilers.