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

The paper discusses the behavioural analysis for shell gasification an d carbon recovery process in a urea fertilizer plant. The system consi sts of three subsystems D, E and F arranged in series, with three poss ible states good, reduced and failed. The subsystem D has three parall el operating units with two units in cold standby. Failure and repair rates for each subsystem are taken as constant. Formulation of the pro blem is carried out using simple probability consideration. The expres sion for steady-state availability is derived. Taking data from a medi um size plant, the effect of each working unit on the system availabil ity is tabulated. The results are supplied to the plant personnel for improvement in designing the system and planning the process for minim um failure.