郭中杰年产30万吨合成氨工艺设计.doc

毕业设计 题 目 名 称： 年产30万吨合成氨 转变工序设计 系 别： 化 学 工 程 系 专 业： 应 用 化 学 班 级： 化工330901班 学 生： 郭中杰 学 号： 5533090109 指导教师（职称）：  摘要 氨是重要的基础化工产品之一在国民经济中占有重要地位以天然气为原料年产三十万吨合成氨工序的设计近年来合成氨工业发展很快，大型化、低能耗、清洁生产均是合成氨设备发展的主流，技术改进主要方向是开发性能更好的催化剂、降低氨合成压力、开发新的原料气净化方法、降低燃料消耗、回收和合理利用低位热能等方面上。 设计采用的工艺流程简介：天然气经过脱硫压缩进入一段转化炉，把CH4和烃类转化成H2，再经过二段炉进一步转化后换热进入高变炉，在催化剂作用下大部分CO和水蒸气反应获H2和CO2，再经过低变炉使CO降到合格水平，去甲烷化工序。 本设计部分主要阐述了合成氨工业的现状及发展趋势以及的论述介绍了氨变换工序的各种流程并确定本设计高-低变串联的流程。部分主要包括热量衡算。具体计算，。Ammonia is the most important one of basic chemical products, plays an important role in the national economy. Ammonia production after years of development, now has developed into a mature chemical production processes.  The design is based on annual output of 300,000 tons of natural gas as raw material, the design of synthetic ammonia transformation process. In recent years, the large-scale industrial development soon ammonia, low energy consumption, the clean production of synthetic ammonia equipment development are the main direction of technical improvement, is to develop better performance of catalyst, reducing ammonia synthesis pressure, the development of new materials gas purification methods, reduce fuel consumption, low heat recovery and reasonable utilization, etc.  The design process used in brief are: compressed natural gas after desulfurization and conversion into a furnace, the methane and hydrocarbons into hydrogen, through the Secondary reformer further transformed into the highly variable furnace heat exchanger, the great catalyst part of the reaction of carbon monoxide and hydrogen and carbon dioxide vapor, then through the low-temperature shift to reduce to an acceptable level of carbon monoxide to methanation process.  The design review described some of the major domestic and international situation and the development of synthetic ammonia indus