生物质循环流化床锅炉掺烧防腐蚀剂的试验研究

摘要

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.%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1121.31 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。