what do you mean by flow sheet ? discuss the various flow sheet used in chemical engineering operation
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Answer:
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Explanation:
Flowsheet generation is digitized using three separate matrices (structure, design, and parameter matrices) which embody all information required to fully determine each individual flowsheet of any generations. A set of restrictive rules are defined using engineering judgment to prevent generation of non-realistic flowsheets. GA is free to generate all possible process flowsheets using random number generators as long as it does not overlook these rules. Then these structures are investigated, evaluated, and sorted based on defined fitness function (i.e. objective function). The less fit flowsheets in each generation are replaced by new randomly generated solutions (Arab et al. 2016). In flowsheet solving algorithm, the membrane unit separation process is simulated using a validated model based on Shindo’s work (Shindo et al. 1985). The nature and form of objective function is critical to optimization problems. Since the main aim of this study is proposing a robust optimization-based flowsheet synthesis method in a complex search space, a simple objective function is defined as 1xCO2,Perm., where xCO2,Perm. is the purity of the CO2 in the final permeate product stream. The feed to the capture unit is flue gas of a coal-fired power plant with fixed composition of xCO2=0.130, xN2=0.804, xO2=0.036, and xHO2=0.03.