• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>COAL-GEN >Protection of Waterwall Tubes from Corrosion in Low NO{sub}x Coal Fired Boilers
【24h】

Protection of Waterwall Tubes from Corrosion in Low NO{sub}x Coal Fired Boilers

机译：保护水壁管免受腐蚀的低NO {Sub} X燃煤锅炉

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Corrosion-resistant weld overlays are now commonly used to reduce corrosion of boiler tubes in low NO{sub}x coal fired boilers. Alloys with a high chromium content are the most resistant to corrosion in this type of service. A new high chromium alloy has recently been introduced for weld overlay applications and has shown excellent resistance to corrosion in low NO{sub}x coal-fired environments. The new material is Alloy 33 (UNS R20033) and contains approximately 33% chromium, 32% iron and 31% nickel. The improved corrosion resistance of Alloy 33 should result in longer life of the weld overlay than those materials currently used to protect boiler tubes. Alloy 33 should also better resist circumferential cracking than the Mo-containing alloys now being used (such as Alloys 622 and 625); recent studies show that Mo segregation in weld overlays may be part of the circumferential cracking mechanism. After nearly 2 years of service in low NO{sub}x coal fired boilers, field tests on Alloy 33 weld overlay continue to demonstrate that it resists both corrosion and cracking. In addition, the composition of Alloy 33 results in a lower cost than the current alloys being used and/or considered.
机译：耐腐蚀焊接覆盖现在通常用于减少低NO {SUB} X燃煤锅炉中锅炉管的腐蚀。具有高铬含量的合金是这种类型的服务中腐蚀的最耐腐蚀性。最近引入了一种新的高铬合金，用于焊接覆盖应用，并在低NO {SUB} X燃煤环境中显示出优异的腐蚀性。新材料是合金33（UNS R20033），含有约33％的铬，32％铁和31％镍。合金33的改善耐腐蚀性应导致焊缝覆盖层的寿命比目前用于保护锅炉管的那些材料。合金33还应更好地抵抗圆周破裂，而不是现有的含Mo合金（例如合金622和625）;最近的研究表明，焊缝覆盖层的Mo偏析可以是周向裂缝机构的一部分。经过近2年的低于{Sub} X燃煤锅炉，对合金33焊缝覆盖的现场试验继续证明它抵抗腐蚀和裂缝。另外，合金33的组成导致比使用和/或考虑的当前合金的成本较低。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号