PDF《燃用高硫煤四角切圆锅炉水冷壁 高温腐蚀治理》

第48 卷第4期热力发电Vol.

48 No.4

2019 年4月THERMAL POWER GENERATION Apr.

2019 收稿日期:2018-08-19 基金项目:国家能源集团科技资助项目(2016E1TP00200-001) Supported by:Science and Technology Projects of National Energy Group (2016E1TP00200-001) 第一作者简介:毛晓飞(1978―),男,硕士,高级工程师,主要研究方向为煤的清洁高效燃烧和污染控制技术,[email protected]. 燃用高硫煤四角切圆锅炉水冷壁 高温腐蚀治理 毛晓飞

1 ,左志雄

2 ,汪正海

1 ,刘宣义

1 ,董中俊

2 (1.国电科学技术研究院有限公司,湖北 武汉 430066;

2.国电长源汉川第一发电有限公司,湖北 汉川 431614) [摘要]针对某

330 MW 机组燃用高硫煤四角切圆锅炉水冷壁出现的高温腐蚀问题,采用自主研制 的一种防腐耐磨涂层材料对水冷壁管进行了超音速电弧热喷涂,并对水冷壁贴壁烟气中 O

2、CO 及H2S 体积分数进行了测试,分析了运行氧体积分数、二次风配风方式(含燃烧 器周界风)、一次风量、三次风量、煤粉细度等因素对水冷壁高温腐蚀的影响,通过优化 锅炉运行方式,高负荷下水冷壁贴壁还原性气氛大幅下降,尤其 H2S 体积分数由之前的 0.030%~0.045%降至 0.030%以下,局部降幅高达 50%以上.通过上述综合治理措施,该炉 在2016 年12 月大修结束后运行至今,未发生燃烧器区域的水冷壁管及涂层的更换,根据 理论计算涂层可服役时间约为 3.41 年, 可保证向火侧管壁在

1 个大修周期不会因腐蚀导致 失效. [关键词]四角切圆锅炉;

高硫煤;

低氮燃烧器;

水冷壁;

高温腐蚀;

热喷涂;

还原性气氛;

综合治理 [中图分类号]TK224.9 [文献标识码]B [DOI 编号]10.19666/j.rlfd.201808183 [引用本文格式]毛晓飞, 左志雄, 汪正海, 等. 燃用高硫煤四角切圆锅炉水冷壁高温腐蚀治理[J]. 热力发电, 2019, 48(4): 96-103. MAO Xiaofei, ZUO Zhixiong, WANG Zhenghai, et al. High temperature corrosion control for water wall of a tangentially-fired boiler firing high sulfur coal[J]. Thermal Power Generation, 2019, 48(4): 96-103. High temperature corrosion control for water wall of a tangentially-fired boiler firing high sulfur coal MAO Xiaofei1 , ZUO Zhixiong2 , WANG Zhenghai1 , LIU Xuanyi1 , DONG Zhongjun2 (1. Guodian Science and Technology Research Institute Co., Ltd., Wuhan 430066, China;

2. Guodian Changyuan Hanchuan No.1 Power Generation Co., Ltd., Hanchuan 431614, China) Abstract: In view of the high temperature corrosion of water wall in a

330 MW tangentially-fired boiler firing high sulfur coal, a kind of self-developed anticorrosive and wear-resistant coating material was used to carry out supersonic arc thermal spraying on the water wall tube, and the flue gas components (O2, CO and H2S) near the water wall were detected. The influence of oxygen content, the secondary air distribution (including burner surrounding air), primary air volume, tertiary air volume, fineness of pulverized coal and other factors on the high temperature corrosion of water wall was analyzed. By optimizing the operation mode of the boiler, the concentration of reductive atmosphere near the water wall greatly reduced, especially the concentration of H2S dropped from 0.030%~0.045% to below 0.030%, the reduce amplitude in some areas reached higher than 50%. Through the above comprehensive control, the water wall tubes and coatings in the burner area have not been replaced since the overhaul of the boiler in December 2016. The coatings of the water wall tubes were measured during the unit stopping. According to theoretical calculation, the service time of the coatings was about 3.41 years. It can ensure that the fire-facing side of the water wall tubes will not fail due to corrosion during an overhaul period. Key words: tangentially-fired boiler, high sulfur coal, low nitrogen burner, water wall, high temperature corrosion, thermal spraying, reductive atmosphere, comprehensive control 第4期毛晓飞 等 燃用高硫煤四角切圆锅炉水冷壁高温腐蚀治理