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PDD_33_CDQS_PPO - Process Design Decisions(PDD Process...

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Process Design Decisions (PDD) Prof B V Babu Process Design Decisions Copyright © 2008-2009 B V Babu, BITS-Pilani LECTURE - 33
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Process Design Decisions (PDD) Prof B V Babu Cost Diagram and Quick Screening of Process Alternatives Cost diagram Conventional approach Alternative approach Quick screening of process alternatives Systematic procedure Base case and alternatives Copyright © 2008-2009 B V Babu, BITS-Pilani Preliminary Process Optimization Rigorous Optimization Approximate optimization – Objectives – Example Dominant trade-offs for design variables Rank order parameter (most important design variable) Proximity parameter (incentive for optimization)
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Process Design Decisions (PDD) Prof B V Babu Cost Diagrams Summarizing the cost information to find the best possible alternative Cost diagrams Conventional approach 1. To prepare a table of equipment costs that is coded to a flowsheet. Copyright © 2008-2009 B V Babu, BITS-Pilani Similar type of equipment i.e. compressors, heat exchangers, distillation columns etc. are grouped together 2. A similar type of table is prepared for Operating costs and All the individual values for a particular type of utility, i.e. electric power, steam etc., are summed and reported as a single entry
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Process Design Decisions (PDD) Prof B V Babu Cost Diagrams A cost summary for the disproportionation of toluene is given in Flowsheet : Fig. 9.1-1 Investment summary: Table 9.1-1 Operating cost summary: Table 9.12 (or) 9.1-3 Two tables are to be looked into simultaneously along with the Copyright © 2008-2009 B V Babu, BITS-Pilani flowsheet
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Process Design Decisions (PDD) Prof B V Babu Cost Diagrams Alternative approach All the costs are put on a flow sheet Annualized, installed equipment costs are placed inside the boxes on the flow sheet and Operating costs are attached to the stream arrows Advantage Copyright © 2008-2009 B V Babu, BITS-Pilani Visual picture of how the costs are distributed throughout the process Costs of the pumps, drums are not included in the diagram, assuming they have small cost values
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Process Design Decisions (PDD) Prof B V Babu Quick Screening of Process Alternatives Systematic procedure Keep a list of each decision that we make as we proceed through the base-case design Then as we change these decisions, we generate the process alternatives We want to make some estimate of the economic importance of each alternative, rather than repeat the design for each case, in Copyright © 2008-2009 B V Babu, BITS-Pilani order to minimize our design effort We use the cost diagrams as a tool in making these estimates See Table 9.3-1 Process alternatives for HDA process Figs. 9.4-1 to 9.4-5 5 alternate flowsheets for HDA process with diphenyl recycled Different from energy integration point of view (HENS)
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Process Design Decisions (PDD) Prof B V Babu Quick Screening of Process Alternatives See Table 9.4-1 Optimization results for HDA process with diphenyl recycled for 5 various process alternatives are shown Copyright © 2008-2009 B V Babu, BITS-Pilani
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