Simulation and Optimization of Thermal Combined Energy Saving for Maleic Anhydride and Its Supporting n-Butane Unit
For the maleic anhydride unit and the light hydrocarbon propane-n-butane isomeric combined unit,the thermal combined system was optimized during the design process.By taking the advantage of the low operating tempera-ture of the light hydrocarbon separation(C4 component separation tower),a large amount of low temperature(85 ℃)hot water produced by the maleic anhydride unit was reasonably and effectively utilized,and the complementary cooling and heating between the units was realized from the overall perspective of the project,achieving a 1+1＞2 effect.For one ton of product,the energy consumption of E-510 and E-202 was reduced from 58.61 kg standard oil before optimization to 19.54 kg standard oil.The energy-saving efficiency of the C4 separation tower reboiler and maleic anhydride product cool-er reached 67％.
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