Stock Taking CO_2 removal systems for ammonia plants

摘要

The economics of hydrogen and amonia manufacturing plants heavily depend on the efficiecy and reliability of systems used for removal of carbon dioxide (CO_2)from process gas.during the last 30 years of develpment of hydrogen and ammonia plant process flow sheet,several innovatons have taken place in this section of the plant resulting in a n increase in efficiency of absorption,reduced CO_2 slip of the order of a few parts per million by volume (ppmv),reduction in energy requirements for regeneration of CO_2,combating corrosionof plant equiment,emergence of non toxic and environment-friendly solvent systems and activators for absorption,a shift from physical and chemcial modes of absorption to a combination of both,improvements in mass transfer through better gas-liquid contact and so on.