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本文以上海外高桥电厂二期900MW超临界机组空气预热器的漏风问题为背景,针对生产过程中存在的控制设备老化、技术落后等问题,开发了基于PLC的空气预热器间隙控制系统。采用MT500系列触摸屏方式实现了操作简便可视化控制。系统投入生产运行后,提高了空气预热器间隙控制精度,能够有效地降低空气预热器的漏风,为机组的安全运行提供了保障。
Based on the air leakage problem of the air preheater of the 900MW supercritical unit in the second phase of Shanghai Waigaoqiao Power Plant, aiming at the problems such as the aging of the controlling equipment and the backward technology in the production process, the air preheater clearance control system based on PLC . Using MT500 series touch screen to achieve easy operation and visual control. After the system is put into production and operation, the control precision of the air preheater gap is improved, the air leakage of the air preheater can be effectively reduced, and the safe operation of the aircrew is ensured.