Revamp of the 1st effect of a 4-effect evaporator train into a self-cleaning configuration. After taking the plant back into operation, the evaporation capacity kept constant, which results in increased production, lower downtime and reduced maintenance cost.
Four self-cleaning heat exchangers have been installed to cool quench water of an Acetylene Plant, which resulted in a reduction of the number of cleanings to zero, a reduction of the heat transfer surface with a factor 5, an increase in the heat transfer with a factor 2 and a decrease in required pumping power with a factor 2.
This vacuum evaporator, installed in 1997 and still in operation, increases the solids concentration of the stillage resulting from Shochu distillation. The use of a self-cleaning heat exchanger makes it possible to further increase the concentration of the stillage when compared with other technologies. This results in a significant reduction of the wet waste.
This forced circulation re-boiler is for more than 20 years in operation. One annual inspection replaces cleaning every 4 to 5 days. A significant cost saving results from the higher recovery of acetic acid and the more concentrated residue in the bottoms.