BEHAVIORAL-ANALYSIS OF A SHELL GASIFICATION AND CARBON RECOVERY PROCESS IN A UREA FERTILIZER PLANT

The paper discusses the behavioural analysis for a shell gasification and carbon recovery process in a urea fertilizer plant. The system con sists of three subsystems D, E and F arranged in series, with three po ssible states-good, reduced and failed. The subsystem D has three para llel operating units with two units in cold standby. Failure and repai r rates for each subsystem are taken as constant. formulation of the p roblem is carried out using simple probability consideration. An expre ssion for steady-state availability is derived. Taking data from a med ium sized plant, the effect of each working unit on the system availab ility is tabulated. The results are supplied to the plant personnel fo r improvement in designing the system and planning the process for min imum failure.