1050MW超超临界机组给水加氧技术研究应用  

Research and Application of Feedwater Oxygenation Technology for 1 050 MW Ultra Supercritical Unit

作　　者：钟丁平 范日新 林木松 ZHONG Dingping;FAN Rixin;LIN Musong(Guangzhou Yueneng Power Technology Development Co.,Ltd.,Guangzhou 510699,China;Electric Power Research Institute of Guangdong Power Grid Co.,Ltd.,Guangzhou 510080,China)

机构地区：[1]广州粤能电力科技开发有限公司,广东广州510699 [2]广东电网责任有限公司电力科学研究院,广东广州510080

出　　处：《电力大数据》2024年第8期70-78,共9页Power Systems and Big Data

基　　金：南方电网有限责任公司科技项目(GZKJXM20222338)。

摘　　要：爪哇1号机组锅炉为一台我国产的1050 MW超超临界直流锅炉,自投产以来,给水采用弱氧化性全挥发处理,存在锅炉差压上升过快、给水和疏水析出的铁量较高、水冷壁管结垢速率偏大、每个再生周期内精处理混床处理冷凝水量偏少等诸多问题。通过将锅炉给水处理方式由弱氧化性全挥发处理转换为加氧处理的应用研究,对比分析给水在不同加氧量、pH值下铁腐蚀产物析出量的变化,在控制省煤器入口氧量为20~60μg/L,给水pH至8.7~9.0时,给水系统和疏水系统的腐蚀得到明显抑制,给水腐蚀产物铁析出量降低65.2%,高加疏水腐蚀产物铁析出量降低84.4%,低加疏水铁析出量降低82.0%。单台精处理混床连续运行时间由不到一周延长到30天左右,每周期处理凝结水量由8~13万吨延长到30万吨以上,直接经济效益达200.5万元/年,年减少废水排放量37600吨,获得了较好的技术经济效益和社会效益。Since the commissioning of the 1050 MW ultra supercritical once-through boiler of Java Unit 1,the feedwater has been treated with weak oxidation full volatilization,resulting in a rapid increase in boiler differential pressure,high iron precipitation in the feedwater and drainage,high scaling rate in the water-cooled wall tubes,and the small amount of the condensation water treated by the fine treatment mixed bed during each regeneration cycle.Through the application research of converting the boiler feedwater treatment method from weak oxidation full volatilization treatment to oxygenation treatment,the variation of iron corrosion product precipitation in the feedwater under different oxygen addition and pH values is studied.By controlling the oxygen amount at the inlet of the economizer to 20-60μg/L and the feedwater pH to 8.7-9,the corrosion of the feedwater system and drainage system is significantly inhibited,and the iron precipitation of the feedwater corrosion product is reduced by 65.2%,the amount of iron precipitation in the hydrophobic corrosion product of the high-pressure heater decreased by 84.4%,while that of the low-pressure heater decreased by 82.0%,the continuous operation time of a single mixed bed of the condensate fine treatment system is extended from less than a week to about 30 days,and the amount of the condensate treated per cycle is extended from 80000 to 130000 tons to over 300000 tons.The direct economic benefits reach 2.005 million yuan per year,and the annual reduction of wastewater discharge reaches 37600 tons,achieving good technical,economic,and social benefits.

关 键 词：超超临界机组 直流锅炉 加氧处理 应用研究 

分 类 号：TK22[动力工程及工程热物理—动力机械及工程]