低温余热驱动的合成氨吸收分离及其与冷凝分离的比较  

Comparison of Separation of Ammonia by Absorption Driven by Low-Temperature Waste Heat with Separation by Condensation

作　　者：杨景昌[1] 何景连[1] 赖国长[1] 

机构地区：[1]四川大学化工学院,成都610065

出　　处：《化肥工业》2007年第4期24-29,共6页Chemical Fertilizer Industry

摘　　要：合成氨分离普遍采用的冷凝分离法不仅能耗高,而且不利于氨合成压力大幅度降低。通过对吸收法分离合成氨过程的模拟,分析了驱动热温度、冷却水温度等条件的影响,并将其火用耗与冷凝分离法进行了比较。吸收分离法有利于利用低温余热,并且可在较大的冷却水温度范围内稳定操作;吸收法分离合成氨的火用耗低,不足冷凝法的三分之二;可利用低温余热代替冷凝法所需的昂贵的电能;虽然其冷却水耗量明显高于冷凝分离法,但其影响较小。在较低的合成压力下,吸收法的分离效果显著优于冷凝法,该过程应用于低压合成氨系统非常有利。Separation by condensation is generally not only high in energy consumption but also unfavorable pressure. Through used to separate ammonia, and this method is for substantial decrease in ammonia synthesis simulation of separation of ammonia by absorption, an analysis is made of the effect of the temperature of driving heat and that of cooling water, and a comparison is made of its exergy consumption with that of separation by condensation. Separation by absorption is advantageous to the utilization of low-temperature waste heat, and it can by operated stably in a large temperature range of cooling water. Exergy consumption in the absorption method is low, less than tow-thirds of the condensation method; low-temperature waste heat can be utilized to replace the condensation method, which requires expensive electric power; though its consumption of cooling water is markedly higher than that of condensation, its impact is little ; under lower synthesis pressure, the separation effect of absorption is remarkably superior to that of condensation, and it is very beneficial when used in a low-pressure synthesis system.

关 键 词：合成氨 分离 吸收 冷凝 能耗 比较 

分 类 号：TQ223.121[化学工程—有机化工]