Browsing by Author "Nath, Ravindra, 1932-"
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Item Optimal synthesis of serial particulate recovery schemes(1975) Nath, Ravindra, 1932-; Motard, Rodolphe L.; Andrews, John F.; Henley, Ernest J.A procedure for synthesis of multistage acyclic systems is described. In such problems the "number of stages" is a discrete variable to be determined. This problem is solved by comparing the optimum design for various values of "number of stages" till a local minimum is detected. The optimum design for a given number of stages is determined by the Forward Dynamic Programming algorithm. Synthesis of Air Pollution Control Equipment Schemes is used to illustrate the method. The cost-efficiency data for each equipment type is collected by parametric studies, the parameters being the dust distribution, inlet flow rate, and the desired collection efficiency. This data is analysed to determine, for each equipment type, a region of feasibility in removing particulate matter from a given stream. If an equipment is outside the region of feasibility for a particular operation, it can be rejected apriori without performing calculations by CEDA. Conservative criteria based on the above, are determined for apriori selection of equipments for a specified stream. This selection reduces the computation time considerably.Item Studies in the synthesis of separation processes(1977) Nath, Ravindra, 1932-; Motard, Rodolphe L.; Bailey, James E.; Andrews, John F.; Jackson, Roy; Anderson, Robert B.Problems related to the synthesis of separation sequences have been considered in this dissertation. The main emphasis has been on the synthesis of sharp separation sequences. The synthesis of a separation sequence implies the creation of an arrangement of separation units that will isolate species from a given multicomponent feed stream at a minimum cost. The products are specified in terms of desired recoveries and purities. An evolutionary approach is used. The synthesis problem is decomposed into two phases, 1) creation of an initial feasible structure, and 2) evolution of the structures. A heuristic procedure for the creation of an initial structure is developed. The heuristic rules embody the knowledge of the general behavior of separation units and separation sequences in a form which is suitable for computer implementation. Starting from the feed stream, a systematic application of the eight heuristic rules creates a good initial structure. In the evolutionary phase, the initial structure is successively modified by the application of five evolutionary rules. The evolutionary rules are applied in a hierarchical manner until no modification can. be detected. The structure thus obtained is termed the "optimal structure" and is not changed in the later work. [...]