生物质循环流化床锅炉掺烧防腐蚀剂的试验研究

在亚洲最大的50 MW生物质循环流化床直燃锅炉上进行了掺烧防腐蚀剂的燃烧试验，防腐蚀剂采用多孔膜结构，主要成分是MgO、高岭土、活性Al₂O₃和发泡剂，试验结果表明：掺烧防腐蚀剂不会降低锅炉热效率，且能够有效地降低飞灰中K、Cl元素的含量，将其固留在炉渣中。当防腐蚀剂添加量占总燃料质量的3%时，飞灰中的K元素含量由7.62%下降为5.69%，Cl元素含量由3.86%下降为2.35%；而炉渣中的K元素含量由4.03%上升为4.71%，Cl元素含量由756.58 mg/kg上升为1 121.31 mg/kg；同时烟气中的HCl排放量由25 mg/Nm3下降为15 mg/Nm³，NO含量由268 mg/Nm3上升为309 mg/Nm³。

Experimental Investigation on Addition of Anticorrosive Agent in a 50-MW Biomass-Fired Circulating Fluidized Bed Boiler

Experiments on combustion of pure biomass and biomass with anticorrosive agent were carried out in a 50-MW biomass-fired circulating fluidized bed boiler. The anticorrosive agent has a porous structure and mainly contains magnesium oxide (MgO), kaolin, activated alumina (Al₂O₃) and foamer. Results obtained in experiments show that, boiler thermal efficiency was weakly influenced by the anticorrosive agent, and contents of K and Cl in flue ash decreased as contrast to the increase of K and Cl in furnace slag. When the mass percentage of anticorrosive agent is 3%, in the flue ash, the K values ranged from 7.62% to 5.69%, and Cl values reduced from 3.86% to 2.35%. While in furnace slag, the values K varied from 4.03% to 4.71%, and Cl values increased from 756.58 mg/kg to 1 121.31 mg/kg. Due to the anticorrosive agent, the content of HCl in flue gas decreased from 25 mg/Nm³ to 15 mg/Nm3, as the emission of NO increased from 268 mg/Nm3 to 309 mg/Nm³.