超临界机组给水加氧处理技术

Oxygenated feed-water treatment technology at the supercritical units

大唐三门峡发电有限责任公司的3#机组给水早期采用还原性全挥发处理方式,存在流动加速腐蚀,机组投运不到2年,水冷壁垢量就接近化学清洗标准,现在改用给水加氧处理技术.介绍给水加氧处理技术,分析应用效果.与还原性全挥发处理方式比较,加氧处理技术具有锅炉受热面结垢速率低、化学清洗周期短、精处理混床运行周期长、自用水率低以及化学加药量小等优点,提高了机组运行的经济性和安全性.

The feed-water all volatile treatment（AVT） was applied in the generator unit 3 of Datang Sanmenxia Power Plant Co.Ltd.The generator operated less than two years,the scale quantity of water-wall tubes was close to the limiting values of China Chemical Cleaning Standard due to flow-accelerated corrosion（FAC）.In order to improve it,the feed-water oxygenated treatment（OT） is currently used.The OT technology is introduced and its application results are analyzed in this paper.OT has several advantages over AVT,e.g,low deposition rate of boiler heating surface,long period of the chemical cleaning,long operation period of mixed bed,low auxiliary water ratio and chemical dosing quantity,etc.The economy and security for the unit operation is obviously improved.