Shift Process In The Middle-or Small-sized Synthetic Ammonia Plant

The paper explored the shift process in the middle or small sized syntheticammonia plant using coal as raw material.We analysed the characteristics of widelyused catalysts Fe-Cr type under middle temperature and Co-Mo type under lowtemperature.Furthermore, we explored the M-L-L shift process and the overall lowtemperature shift process which is suitable for the foregoing two type catalysts,andcompared the advantages and disadvantages the foregoing two type shift process.Atechnology approach aiming at achieving zero outside steam comsumption from thepoint of view of using energy economically,according to the conclusion of theoreticalcalculation. In combination with the prsent production situation of ShandongHualu-Hengsheng Group Co.,Ltd., We presented an improved scheme on shiftprocess in the old synthetic ammonia plant.The purpose of this paper is to optimize the synthetic ammonia plant inShandong Hualu-Hengsheng Group Co.,Ltd.,and to reduce the steam consumptionand resistance ,to increase the product capacity in the shift stage, in the finalanalysis to achieve better benefits.This paper can also make a reference for others tooperate, to improve technology or to choose the shift process.This paper exploredthree representative shift process (the M-L shift process, the M-L-L shift process, theoverall low shift process).By using the means of thermodynamics and reactiondynamics,we stressly discussed that the catalysts Fe-Cr type can beover-deoxidized,and the over-deoxidization is harmful to the process of syntheticammonia.The scheme of "zero outside steam comsumption" in shift process proposed inthis paper is relatively easy to put into practice and is thus of great application value.