Abstract Combustion of SRF (solid recycled fuel) and biomass with potassium (K), sodium (Na), and chlorine (Cl) contents can result in operational problems such as hard deposit formation and convection pass tube corrosion. Two types of commercially available chemical additives, ammonium sulfate [(NH4)2SO4] and borax solution, were examined to elucidate their effect on hard deposit formation and the particle composition of fly ash on the convection pass of a commercial CFBC (circulating fluidized bed combustion) boiler. The addition of ammonium sulfate/borax solution hindered metal chloride formation and reduced the amount of hard deposit formation on the convection pass tubes. Both the alkali and potassium chloride content and the point load hardness of the hard deposit were reduced, while the melting temperature increased according to the borax solution use. When chemical additives were employed, the particle size distribution of the fly ash shifted to coarse particles. In particular, SEM (scanning electron microscopy) images of the fly ash particles revealed the attachments of fine particles to the ash particles. These were assumed to be mineral salts attached to the coarse particles, which increased the overall particle size distribution.

中文翻译：

---

化学添加剂对燃烧韩国固体再生燃料的商业循环流化床锅炉中硬沉积物形成和灰分组成的影响

摘要 SRF（固体再生燃料）和含有钾 (K)、钠 (Na) 和氯 (Cl) 的生物质燃烧会导致操作问题，如硬沉积物形成和对流管腐蚀。研究了两种市售化学添加剂，硫酸铵 [(NH4)2SO4] 和硼砂溶液，以阐明它们对硬沉积物形成的影响以及商业 CFBC（循环流化床燃烧）对流过程中飞灰颗粒组成的影响。 ) 锅炉。硫酸铵/硼砂溶液的加入阻碍了金属氯化物的形成，并减少了对流管上硬沉积物的形成量。硬质沉积物的碱和氯化钾含量和点载荷硬度均降低，而熔化温度根据硼砂溶液的使用而升高。当使用化学添加剂时，飞灰的粒度分布转变为粗颗粒。特别是，飞灰颗粒的 SEM（扫描电子显微镜）图像揭示了细颗粒对灰颗粒的附着。这些被认为是附着在粗颗粒上的矿物盐，这增加了整体粒度分布。