氧化铝生产节能降本技术研究与应用

Research and Application of Energy-saving and Cost-reducing Technology for Alumina Production

氧化铝生产的能源消耗主要来自于溶出、蒸发的汽耗,焙烧的热耗及全厂的电力消耗等,分析上述耗能工序的热平衡,并采用强化溶出、高效赤泥快速分离洗涤、大型分解槽节能搅拌和焙烧炉烟气余热深度回收利用等综合节能降本技术,以降低这些工序的能耗和生产成本。文中对上述节能降本技术作研究分析后,将其应用在国内某氧化铝企业,可实现氧化铝生产综合能耗降低约4.39%,生产成本降低约3.43%。

The energy consumption in alumina production mainly covers steam consumption by digestion and evaporation, heat consumption by calcinations and power consumption of the whole plant. With heat balance analysis on the above energy consuming procedures, and by adopting some comprehensive energy - saving and cost - reducing technologies such as enhanced dissolving, highly efficient red mud fast separation and washing, energy -saving mixing of large decomposor and deep recycling of waste heat in calciner fume, the energy consumption and production cost for these procedures can be reduced. In this paper, the above energy - saving and cost -reducing technologies are analyzed and then applied to an alumina refinery in China so that the comprehensive energy consumption of alumina production can be reduced by about 4.39 % and the production cost can be reduced by about 3.43 %.