Simulation And Optimization On Sour Water Stripping Column In Refinery

The system that was handled by sour water stripping column had gotten following characteristics: first, the equilibrium ratio was made very complicated by the light-volatile component's content of the water solution and weak base and weak acid molecular proportion size; second, volatility weak electrolyte and watery volatility had different galactic characteristics. The flow plus mediation method was adopted through analyzing all available distillation simulation algorithms. Because the Gaussian elimination method did not fit to solve triple diagonal matrix, generalized inverse matrix law that was based on singular value decomposition was used to solve it. Furthermore, much big matrix condition number of sparse matrix could be avoided and the content initial solution could be acquired even when the matrix was not full rank.The VLE thermodynamic model of volatility weak electrolyte solution was described carefully and the equation of state桸akamura equation was used to solve polarity gaseous mixture's fugacity coefficient which maintained ammonia, carbon dioxide, hydrogen sulfide. Edwards model was modified through adding mutual ternary, quaternary mutual parameters related with temperature, so the activity coefficient of the each particle in system oi'NH3 桯jS ?C02 桯2O was calculated more exactly. The activity coefficient was computed by improved N ?R law. A method, which included three factors, first, activity coefficient of each particle that was presumed to 1, second, the ideal Henry's law of solution was utilized to the solution and initial value was solved with hydrogen ion put forward, third was used to solve the difficulty for confining initial value.Comparing to practical data certified accuracy of result of calculation. Useful conclusions had been acquired after calculating and analyzing results when adjusted to different operational variability. The conclusions included: a. Hot cold match at 4.50; b. Relation between drawn input concentration and steam unit consumption; c. The best siding withdrawing position; d. Relation between feed temperature and steam unit consumption.Both process flow and controlling method of the stripper were optimized. First, liquid among third class drainer was directly pumped in above piece board of siding withdrawing position. The required operating parameters were determined. The feasibility of new flow wascertified. Second, full column was distributed thermocouple to analyze temperature distribution in order to adjust to flow of the heat supply. Moreover, the practical application of the method was specially described.