某电厂单筒式钢筋混凝土烟囱腐蚀调查分析

摘要

The desulfurization in one domestic power plant is changed from dry style to wet style without setting up a flue gas reheating device, which results in significant chimney corrosion. The investigation on the tube surface, concrete, reinforcing bars and linings of the monocular reinforced concrete chimney in this plant and the corrosive media is launched. The assessment on the security and durability of the chimney is made as well, which reveals that the corrosion is quite strong under the circumstance of wet limestone-gypsum FGD with no GGH system. Some recommendations on the anti-corrosion design, construction and operation management of wet chimneys are put forward. Especially it is suggested to enhance the maintenance to realize reliable operation throughout the full life-cycle of the chimney.%国内某电厂脱硫方式由干法改为湿法,且未设烟气再热装置,烟囱出现明显腐蚀现象.对该厂单筒式钢筋混凝土烟囱的筒身外观、混凝土、钢筋、内衬、腐蚀性介质等进行了调查,对其安全性和耐久性进行了评定,腐蚀性等级评价结果为:该电厂在采用石灰石-石膏湿法烟气脱硫且无烟气再热(GGH)系统运行条件下,烟囱腐蚀等级为强腐蚀.在调查研究的基础上,提出了湿烟囱排气筒在防腐设计、施工与运行管理等方面的建议,特别提出对烟囱系统加强维护的观点,以实现烟囱系统全寿命周期内的可靠运行.