Simulation Study on Energy Conservation of Atmospheric Distillation System for Lubricating Oil Hydrogenation
The PROII process simulation software was used to model the atmospheric fractionating system of the lubricating oil high-pressure hydrogenation plant.The fitting results were close to the actual operating data.Based on this model,the feed to the atmospheric fractionating system is changed from a mixed feed of cold and hot oils from LP separators to a sin-gle feed of cold oil from LP separators without heat exchange.The cold oil from LP separators enters the atmospheric frac-tionating tower,and two feed inlets are set up on the 7th laminate and the 13th laminate,respectively,one of which is cho-sen to adapt to changes in feed properties and optimize target product quality in the actual operation.When the plant is run-ning at low load,by increasing the reflux quantity at the top of the tower,the gas and liquid loads are controlled within the original design range to ensure efficient mass transfer on the tray.Simulation calculations show that the heat load of the transformed atmospheric feed heating furnace is reduced by 202 kW and the fuel gas is saved by 18.18 kg/h.The air-cool-ing load at the top of the atmospheric fractionating tower is reduced by 7％,the electricity consumption of the air-cooling fan is reduced by 5.66 kW·h,and the load of the water cooler at the top of the atmospheric tower is slightly reduced.After the transformation,there is no major impact on the products of the unit,the main equipment of the plant requires no signifi-cant modifications,and the total investment is about RMB 100,000.The transformation can save approximately RMB 410,000 per year in operating costs,reduce carbon dioxide emissions by 446 tons per year,and reduce the plant energy consumption by 0.475 kg of standard oil/ton of feedstocks,which has certain reference significance for existing or new-built plants.
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