含钒石煤料球循环流化床焙烧特性试验研究.pdf

含钒石煤料球循环流化床焙烧特性试验研究 周宛谕 施正伦 王勤辉 徐耀斌 骆仲泱 (浙江大学 能源清洁利用国家重点实验室,浙江 杭州 310027) 摘要:为避免传统提钒工艺所存在的问题，本文采用循环流化床钙法焙烧工艺，以 CaO 为添加剂的石煤料 球为焙烧原料，在 1MW 大型循环流化床燃烧试验台上进行含钒石煤循环流化床焙烧特性试验研究，内容 包括：燃烧稳定性、燃烧效率、污染物排放特性、燃烧后灰渣特性。目的在于验证循环流化床钙法焙烧工 艺的可行性，并获得合理可行的焙烧条件，为下一步工业设计提供参考依据。结果表明，在以烟煤为助燃 燃料的条件下，可以实现在1MWe 循环流化床试验台上稳定焙烧运行，兼顾锅炉热效率和钒的氧化焙烧时， 应考虑到实际运行提高氧量的可能性；燃烧效率较高；所生成的NOx 烟气浓度比常规燃煤循环流化床锅炉 稍高，锅炉设计和运行时，须采取适当技术措施降低NOx 排放量；料球中的CaO 有较好的脱硫作用，但对 于高硫石煤，要达到国家污染物排放标准，还须采取尾部烟气脱硫措施；产物以飞灰为主，在锅炉设计和 运行参数时应予以考虑并采取措施，以保证含钒颗粒的氧化焙烧效果。 关键词:石煤 氧化钙 流化床 氧化焙烧 Experimental Study on Calcination Characteristics of Vanadium-containing Stone Coal in CFB ZHOU Wan-yu, SHI Zheng-lun, WANG Qin-hui, XU Yao-bin, LUO Zhong-yang (National Key Lab of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China) Abstract ：To avoid the existing problems in the conventional vanadium extraction processes, this paper adopted calcium roasting process using circulating fluidized bed. It used stone coal ball with the additive (CaO) as raw material, then to be burned in the circulating fluidized bed (1MW) in order to study the calcination characteristics of stone coal containing vanadium, including combustion stability, combustion efficiency, pollutant emission property and ash characteristic. It aimed at verifying the feasibility of this process , gaining the reasonable and feasible calcination conditions and providing references for industrial design. The results showed that stone coal ball could keep stable burning in circulating fluidized bed when using bituminous coal for fuel. Consideration to boiler thermal efficiency and vanadium oxidation roasting results, improving oxygen amount was needed under practical operation. The combustion efficiency was high. The concentration of NOx was a little higher than circulating fluidized bed burni