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Gasification of black liquor is an alternative recovery technology. Pulp and paper industries are turning their attention to black liquor gasification as a replacement for recovery boilers. Gasification-combined cycle exergoeconomic analyses have been used to study the economical and exergetical performance of black liquor. Both conventional iterative exergoeconomic optimization and multi objective evolutionary optimization have been applied. The iterative optimization results have been compared with evolutionary programming results in order to evaluate the accuracy. The strength of proposed optimization methods are elucidated in a case study applied to Mazandaran Wood and Paper Industries Co. Exergetic efficiency of total system can reach up to 58.3% while it is restricted to 57.0% when using the evolutionary optimization. However, the product cost achieved by evolutionary optimization is about 1.0% less than that of iterative optimizations.

Exergoeconomic Optimization of Black Liquor Gasification Combined Cycle Using Evolutionary and Conventional Iterative Method