...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Fuel >Trends in fireside corrosion damage to superheaters in air and oxy-firing of coal/biomass
【24h】

Trends in fireside corrosion damage to superheaters in air and oxy-firing of coal/biomass

机译：炉膛腐蚀对空气中过热器的破坏趋势以及煤/生物质的氧燃烧

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This paper compares the laboratory-based fireside corrosion tests on superheater/reheater materials in simulated air-firing combustion conditions with oxy-firing combustion conditions (with hot gas recycling before flue gas de-sulphurisation). The gaseous combustion environment was calculated based on a specific co-firing ratio of CCP with Daw Mill coal. The fireside corrosion tests were carried out using the "deposit recoat" test method to simulate the damage anticipated in specific environments. A synthetic deposit (Na_2 SO_4:K_2SO_4:Fe_2O_3 = 1.5:1.5:1 mol.) which has commonly been used in fireside corrosion screening trials and is a mix that forms alkali-iron tri-sulphate (identified in many investigations as a cause of fireside corrosion) was used in these tests. The air-fired tests were carried out at temperatures of 600,650 and 700 ℃ and oxy-fired tests were carried out at temperatures of 600, 650, 700 and 750 ℃ to represent the superheater/ reheater metal temperatures anticipated in future power plants with and without synthetic deposits, with four candidate materials: T92, HR3C and 347HFG steels; nickel-based alloy 625 (alloy 625 was only tested with screening deposits). The progress of the samples during their exposures was measured using mass change methods. After the exposures, the samples were examined by SEM/EDX to characterise the damage. To quantify the metal damage, pre-exposure micrometre measurements were compared to the post-exposure image analyser measurements on sample cross-sections. The trends in corrosion damage in both air and oxy-firing conditions showed a "bell-shaped" curve, with the highest metal damage levels (peak) observed at 650 ℃ for air-firing and 700 ℃ for oxy-firing tests. However, at 600 and 650 ℃ similar damage levels were observed in both environments. The shift in peak corrosion damage in oxy-firing condition is believed to be the presence of higher levels of SOx, which stabilised the alkali-iron tri-sulphate compounds. Generally, in both air and oxy-firing conditions the mean metal damage was reduced with increasing the amount of Cr in the alloys. However, at the highest temperatures in both air-firing (700 ℃) and oxy-firing conditions (750 ℃) the metal damage of nickel based superalloy 625 was higher than HR3C.
机译：本文比较了在模拟的空气燃烧燃烧条件与氧气燃烧燃烧条件（烟气脱硫前的热气回收）下，过热器/再热器材料在实验室进行的炉边腐蚀测试。气态燃烧环境是根据CCP与Daw Mill煤的特定混合燃烧比计算得出的。使用“沉积重涂”测试方法进行了炉边腐蚀测试，以模拟在特定环境中预期的损坏。合成沉积物（Na_2 SO_4：K_2SO_4：Fe_2O_3 = 1.5：1.5：1 mol。）通常在炉边腐蚀筛选试验中使用，并且是形成碱式三硫酸铁的混合物（在许多研究中均被确定为引起这种情况的原因）在这些测试中使用了炉膛腐蚀）。空气燃烧试验在600,650和700℃的温度下进行，氧燃烧试验在600、650、700和750℃的温度下进行，以代表未来有或无电厂的过热器/再热器金属温度合成沉积物，含四种候选材料：T92，HR3C和347HFG钢；镍基合金625（合金625仅通过筛分沉积物进行测试）。使用质量变化方法测量样品在暴露过程中的进程。暴露后，通过SEM / EDX检查样品以表征损伤。为了量化金属损伤，将暴露前的微米测量值与暴露后的图像分析仪在样品横截面上的测量值进行比较。在空气和氧气燃烧条件下的腐蚀破坏趋势均显示出“钟形”曲线，在650℃的空气燃烧和700℃的氧气燃烧测试中，金属破坏水平最高（峰值）。但是，在600和650℃的两种环境中均观察到相似的破坏水平。据信在烧氧条件下峰值腐蚀损伤的转移是由于存在较高水平的SOx，从而稳定了碱式铁三硫​​酸盐化合物。通常，在空气和氧燃烧条件下，平均金属损伤会随着合金中Cr含量的增加而降低。但是，在空烧（700℃）和氧烧（750℃）的最高温度下，镍基高温合金625的金属损伤均高于HR3C。

著录项

  • 来源
    《Fuel》 |2013年第11期|787-797|共11页
  • 作者

    T. Hussain; A.U. Syed; N.J. Simms;

  • 作者单位

    Centre for Energy & Resource Technology, Cranfield University, Bedfordshire MK43 0AL, UK;

    Centre for Energy & Resource Technology, Cranfield University, Bedfordshire MK43 0AL, UK;

    Centre for Energy & Resource Technology, Cranfield University, Bedfordshire MK43 0AL, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Biomass/coal co-firing; Oxy-firing; Air-firing; Coal-ash corrosion; Fireside corrosion;

    机译：生物质/煤共烧;烧氧空中射击;煤灰腐蚀;炉边腐蚀;

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