Retrofit design steps

The methodology for column heat integration is explained by Figure 13.8, which can be applied for new and retrofit designs. Let us explain the methodology step-by-step as below. The T-H plot is the column grand composite curve (CGCC), which is discussed in Chapter 11. 

This chapter is organized as follows. In section State of the Art an overview of the state of the art on sustainable retrofit design tools and metrics is presented. In section Framework for Assessment of Retrofit Design Alternatives the strategic sustainable assessment of retrofit design (SARD) framework is presented with a step-by-step description. A case study is presented in section Case Study p-Galactosidase Production to highhght the application of the framework. Finally, conclusions are drawn in section Conclusions. 

A framework called SARD, intended to guide the decision makers in their retrofit design assessment, is presented in this section. Fig. 11.4 presents the flow diagram of sard s steps. 

After classifying the retrofit design actions (step 2), the decision maker should determine the most suitable level of analysis detail for assessing the retrofit designs. For that purpose, the SARD framework proposes a three-layer evaluation for the assessment of retrofit designs. 

Summarizing, the decision maker in this step has the role of deciding the level of the sustainabiUty analysis performed to evaluate the retrofit design su ested in step 2. The current methodology helps to guide him in that decision. 

The final step of the framework is to report through a radar chart the level of detail employed in the analysis of the retrofit design alternatives. Fig. 11.12 illustrates the radar for this specific case study. 

Figure 18.1 depicts the theoretical idea. Prevention through Design is moved upstream in the design process. The intent is to have all hazards and risks dealt with in the Conceptual and Design steps. However, that requires unattainable perfection from the people involved. Hazards and risks will be identified in the Build and Operation and Maintenance steps for which Redesign is necessary in a retrofitting process. 

Figure 4.1 Organization of this chapter showing modeling, simulation and optimization steps for the design of new chemical processes and for retrofitting/revamping existing processes.

From the identified botdenecks (step 1), new design alternatives should be proposed. The decision makers need to be aware of to what extent the retrofit actions are influencing the system. Depending on the retrofit actions undertaken, consequences of those... 

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