【作者】 吴春高；

【导师】 朱军；

【作者基本信息】 西安建筑科技大学 ， 有色金属冶金， 2010， 硕士

【摘要】 在硫酸生产的过程中,含硫原料的焙烧、二氧化硫的催化氧化及三氧化硫(气)和水生成硫酸的反应,都属于放热反应,其中有大量的反应热释放出。其中的焙烧反应和二氧化硫的氧化反应所产生的热属于高中温位余热,对于这部分余热的利用,国内外均有成熟的经验；硫酸生产中的低温位余热主要包括：干燥-吸收系统中三氧化硫的溶解热,硫酸的生成热和稀释热,这些热量通常在干燥-吸收系统被冷却水带走。此外还有气体压缩的物理热。一方面硫酸生产需消耗大量的能量,而另一方面实际生产的过程中回收利用的热量却很少。从循环经济的角度来说,余热利用率高,可以降低生产的成本。硫酸生产工艺中设置一些高效的热回收装置,已经变得越来越重要。目前,硫酸生产过程中的余热回收利用及节能措施已经成为衡量硫酸生产现代化水平的一个重要标志。随着有色冶金硫化矿火法冶炼生产技术的发展,富氧技术的使用使冶炼烟气制酸中的二氧化硫浓度变得越来越高。采用高浓度的二氧化硫作为制酸原料,可以有效地提高转化效率和放热量,将流程中所产生的热量用于反应的自热平衡,可以有效提高反应的稳定性。本研究在物料、热量衡算的基础上,通过对高浓度烟气制酸过程中二氧化硫的催化转化和三氧化硫的吸收过程进行热力学计算；对高浓度二氧化硫的催化转化的速率、热释放速度、温度变化进行理论计算,同时采用计算机模拟计算,利用Chem CAD软件模拟得出数据。通过与理论计算的结果进行比较,分析研究影响热量回收的主要因素。模拟结果可以定量表明高浓度冶炼烟气制酸的工艺过程中会产生大量的热量(高中温位、低温位余热),为余热回收利用设备的选择和工艺设计提供重要的参考依据。更多还原

【Abstract】 In the sulfuric acid production, calcination of sulfur-bearing materials,catalysis and oxidation of sulfur dioxide, and the reaction of sulfur trioxide(gas) and water are all exothermic reaction which release a large number of reaction heat.the heat generated in the calcination and oxidation of sulfur trioxide is high temperature residual heat, which can be uesed sophisticated. In the sulfuric acid production, low temperature residual heat that consists of dissolving heat of sulfur dioxide in drying-absorbing system, formation and dilution heat of sulfuric acid is take away by cooling water in the drying-absorbing system. A large amount of energy is consumed in sulfuric acid production, but only a few heat can be recoveryed. From the point of circulate economy, the production costs can be reduced in the case of high utilization of residual heat, thus efficient heat recovery device should be adopted in sulfuric acid production. At present, the residual heat recovery and energy conservation in sulfuric acid production is becoming more and more important.The using of oxygen-enriched technology cause the concentrate of SO2 in the smelter off-gas become higher and higher. Using high-concentrated SO2 as raw materials to produce sulfuric acid, that will be improve the conversion efficiency and heat release effectively. At the same time,the heat which was created by the technological process can be used in the self-heated balance, then increase the stabilization of the reacting.Based on the calculation of the material balance and the calorific balance, several calculations have been done in this paper, included thermodynamics of SO2 conformed and SO3 absorbed; the rate of conforming and heat releasing; the alteration of temperature. And Compared these data with the result of analogue data by the Chem CAD software, then got the major factors of heat reclaim. The analog results can provide the heat quantity in high-concentrated of process smelter off-gas produced sulfuric acid. There will be have important reference for the equipment selection and the technological design.更多还原