合成气余热驱动的氨吸附分离流程的模拟与比较  

Simulation and comparison of ammonia adsorption & separation process driven by waste heat of synthetic gas

作　　者：张莹[1] 毛雪峰[1] 胡子曼[1] 杨景昌[1] 

机构地区：[1]四川大学化学工程学院,四川成都610065

出　　处：《现代化工》2010年第11期79-82,84,共5页Modern Chemical Industry

基　　金：国家自然科学基金资助项目(20576080)

摘　　要：提出了氨合成气余热驱动的不同氨吸附分离流程,对各流程的操作性能进行了模拟计算,分析和比较了脱附温度及冷却水温度对无回热流程、一级回热流程和二级回热流程的吸附剂用量、所需的热合成气温度、余热用量以及回热量的影响。结果表明,有回热流程的余热用量要明显低于无回热流程,二级回热流程的节能效果最为显著。随脱附温度的升高,吸附剂用量、热合成气温度、余热用量、回热量均存在一个突变点,突变点前后的变化趋势是一致的,即热合成气温度、余热用量和回热量随着脱附温度的升高而增加。脱附温度选在突变点右侧附近,余热用量较低。在相同条件下,吸附分离法的功耗显著低于冷凝分离法。由合成气余热驱动的吸附分离功耗虽然高于由低温余热驱动的吸附分离功耗,但前者利用合成气自身的余热,热量来源有充分保证,且可使脱附换热强度大大加强。The different separation processes of ammonia adsorption driven by the waste heat of synthetic gas are put forward. The operational performance of these separation processes are stimulated thermodynamically, and the effect of desorption temperature and cooling-water temperature on the mass of adsorbent, the temperature of synthetic gas, the waste heat and the recovery heat are analyzed and compared for the processes of non-heat recovery, 1-heat recovery and 2-heat recovery. The results show that the waste heat of heat recovery process is lower than the non-heat recovery process, and the advantage of 2 -heat recovery process is very distinct. When the cooling-water temperature is given, the mass of adsorbent,the temperature of synthetic gas, the waste heat and the recovery heat increase with the increase of desorption temperature. And there is a mutant point and the change trend before and after the mutant point is consistent. When the desorption temperature is about the right side of the mutant point, the waste heat is lower. Furthermore, under the same conditions, the work consumption of adsorption separation is obviously lower than that of the condensation separation. Although the work consumption of adsorption separation driven by the waste heat of syntheitc gas is higher than that driven by the low-temperature waste heat, the former uses the own waste heat of synthetic gas, the heat source is assured and the intensity of heat exchange is increased largely.

关 键 词：合成氨 吸附分离 余热 回热 模拟 

分 类 号：TQ113.12[化学工程—无机化工] TQ028.14