PDF Publication Title:
Text from PDF Page: 116
Chapter 5. Simultaneous Design and Control Optimization of PSA Systems Under Uncertainty optimization studies. 5.2.4 Decision Variables A number of decision variables related to PSA process design, cycle scheduling and controller design should be selected carefully in order to obtain an opti- mal performance. The key process design variables considered are the column length, column diameter and switch valve CVs (ON-OFF operation), while the nominal feed rate (Q ̇0feed) is included as an operational decision variable. The key PSA schedule variables considered are the time durations of the processing steps of the underlying PSA cycle, as they directly control the extent of related governing physical phenomena, determining the PSA key performance indicators such as recovery, purity and other operational constraints. Figure 5.1 shows that out of the time duration variables of the six processing steps, only three can be varied independently in order to maintain a synchronized PSA operational cy- cle. It is important to note that the optimal tuning of switch valves(achieved by incorporating their CV s as decision variable) is crucial to maintain suitable pressure-temporal profiles at the bed ends for varying bed dimensions and step durations. For the controller synthesis problem, manipulative variable bias value, controller gain and integral time are considered as decision variables. 5.2.5 Operational Constraints In past studies on PSA optimization (Table 5.3), incorporating hydrogen purity constraint has been considered sufficeint for the design of an optimal PSA oper- ation. However, only providing purity violation information to the NLP solver can often lead to solutions where other important state variables may take values indicating unrealistic physical behavior during the time horizon of operation. One 116PDF Image | Operation and Control of Pressure Swing Adsorption Systems
PDF Search Title:
Operation and Control of Pressure Swing Adsorption SystemsOriginal File Name Searched:
Khajuria-H-2011-PhD-Thesis.pdfDIY PDF Search: Google It | Yahoo | Bing
CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
Heat Pumps CO2 ORC Heat Pump System Platform More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)