Abstract: The deep vacuum pumping system of the atmospheric and vacuum distillation unit III at SINOPEC Jinling Company consisted of third stages of steam vacuum pumping, in which wet air cooling and ordinary water cooling were used for the cooler downstream the vacuum extractor. However, the corrosion fouling was serious, the cooling effect was not good, and fluctuation vacuum was observed in the deep vacuum tower system. So it was necessary to revamp the system with a scheme using secondary steam pumping, high efficiency water cooling and liquid ring pump unit. After the revamping, the steam consumption and sulfur-containing sewage was significantly reduced, the energy consumption of the plant was reduced, and the economic benefit was remarkable. This paper discusses the comparison and selection of process schemes for the revamping and the design and application effect of process flow, layout and piping installation.

Key words: vacuum pumping system, design, energy consumption