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减压蒸馏装置过汽化油设计存在三种方案,即过汽化油引至减压塔底、减压炉前循环和作为侧线产品抽出。以3.0Mt/a燃料型减压蒸馏为例,利用Aspen Plus流程模拟软件,考察上述三种设计方案对于加热炉负荷、炉出口温度、减三线蜡油(HVGO)质量和减压拔出率的影响。对于小规模减压蒸馏装置,在加工轻质原油、不进行减压深拔的条件下,过汽化油引至减压塔底和减压炉前循环两者差别较小;对于大型减压蒸馏装置或加工重质原油的减压深拔技术,减压炉前循环方案更具优势,加热炉出口温度降低,炉负荷减少,能耗降低。过汽化油作为侧线产品抽出时,能显著改善减三线蜡油的产品质量,该方案提高了减压拔出率,但是导致减压炉负荷相应增加,炉出口温度相应提高,同时使减底泵的电耗增加。在实际工程设计中,应根据减压蒸馏装置所加工的原油性质、产品要求和设备投资进行综合比较后,确定适宜的方案。
Vacuum distillation unit over-evaporation of oil design there are three options, namely, the vaporized oil to the bottom of the vacuum tower, vacuum furnace before the loop and as a side product out. Taking 3.0Mt / a fuel vacuum distillation as an example, the Aspen Plus flow simulation software was used to investigate the effect of the above three design schemes on furnace load, furnace outlet temperature, HVGO quality, influences. For the small-scale vacuum distillation unit, under the condition of processing light crude oil without depressurization and deep drawing, the difference between the super-evaporated oil leading to the bottom of the vacuum tower and the pre-decompression furnace is small; for the large-scale vacuum distillation Equipment or processing of heavy crude oil depressurization deep drawing technology, decompression furnace before the cycle program more advantages, the furnace exit temperature decreases, the furnace load decreases, reducing energy consumption. When the vaporized oil is withdrawn as a side product, the product quality of the reduced three-line wax oil can be remarkably improved. The solution increases the rate of pressure reduction and pull-out, but leads to a corresponding increase in the pressure of the vacuum furnace and a corresponding increase in the outlet temperature of the furnace, The power consumption increases. In the actual project design, should be based on the vacuum distillation unit processed crude oil properties, product requirements and equipment investment for a comprehensive comparison, determine the appropriate program.