| After the residual oil feedstock for synthetic ammonia uint gasifier was replaced with natural gas, the total carbon and sulfur content of natural gas was low, leading to the amount of CO shift reaction reduced about30%,in which affects the heat transfer process and the process parameters of waste heat recovery,Through the simulation and optimization of the CO shift unit,to determine the technical transformation scheme.Based on the original design data, PROII process simulation software was used to simulate the transformation process,The simulation of shift reactor selected Equibrium Reactor module, In the thermodynamic method selection, process stream side using SRKM state equation, saturated water and steam using IAPWS-IF97Steam Tables method simulation. The results of simulation and design values were tally well. Based on this result and combined with the actual situation,to The medium temperature shift next to medium temperature transformation and The medium temperature shift next to low temperature transformation are studied. Operating parameters, investment and consumption of natural gas compared,The technical scheme was determined. On the basis of heat exchanger network is analyzed and optimized,and the shift reaction temperature, pressure, the operation conditions of water-gas ratio and other parameters are analyzed and discussed.Through the PROII simulation and the results calculated, which is consistent with the design value of each stream, guarantees the feasibility and applicability of the process simulation, provides the basis for shift unit transformation schemes. After the technical scheme selection, determined by the medium temperature shift next to low temperature shift scheme, because domestic not sulphur-resistant catalyst using temperature is low, the process pressure was high, dew point temperature is high, so we choose Cu-Zn low temperature shift catalyst (83-6), export CO can be reduced to0.80%, reduce the consumption of raw materials. |
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