Grey Decision on Oil Distillation Exchangers Rebuilding Project

The exchangers on the top of distillation tower exposed to wash erosion seriously when Shengli refinery processed Middle-east crude oil. Considered the heat transfer efficiency, manufacture fee, maintenance fee, manufacture difficulty and safety in exchangers rebuilding project, established mathematics model with grey system theory, and carried on grey decision. Grey incidence decision shows that the helix-baffled structure with 20 carbon steel aluminizing tube is the preferential plan, then is helix-baffled structure with 20+TH847 tube, common structure with 20 carbon steel aluminizing tube, common structure with 20+TH847 tube. In general, helix-baffled structure is better than general contractures, should take action to lower the fabricate difficulty of helix-baffled exchangers.