天然气制氨厂增产节能总结

Summarization for Production Increasing & Energy Saving in Ammonia Making Plant by Natural Gas

简述了创新型kellogg合成氨装置工艺流程,介绍了完善该装置的主要节能技改措施:一段炉转化管改用薄壁转化管,增大对流段盘管换热面积;中变工段选用低温催化剂、增设低变保护器;脱碳工段用波纹规整填料取代散装填料;冷冻系统将列管冷凝器更换为蒸发式冷凝器;合成工段采用膜回收技术回收弛放气中的H2,运用深冷无动力氨回收技术回收气氨;将U型管——壳体式转化气废锅更换为挠性薄管板转化废锅。技改结果表明:合成氨生产能力由120 t/d增加到145 t/d,能耗由34.751 GJ降低为33.206 GJ,技改直接经济效益1 030万元/a,2年内可回收技改投资。

Author has briefly described the process flow of an innovation type of Kellogg ammonia synthesis plant, described also the main energy conservation and technology reformation measures for improving this plant, these measures are： primary reformer tubes being changed to use thin wall tubes, adding heat exchange area of coil tubes for convection section; selecting low temperature shift catalyst in middle temp. shift stage, adding protector for low temp. shift ; using corrugated regular packing in replace of loose packing; tube type condenser being changed to evaporation type condenser in refrigeration system; adopting membrane recovery technology to recover hydrogen from releasing gas in ammonia synthesis section; applying deeply cooling ＆ non-power ammonia recovery technology to recover gaseous ammonia; changing the tube ＆ shell waste boiler for reforming gas to the flexible ＆ thin tube sheet waster boiler. The result of technical reformation indicates that production capacity for ammonia synthesis is increased from 120 t/d to 145 t/d, the energy consume is decreased from 34. 751 GJ to 33. 206 GJ, the direct economic effect from technical reformation is 10.3 million Yuan RMB, the investment for technical reformation can be recovered in 2 years.