(537e) Design and Optimization of Multifunctional Processes for Utilizing Unconventional and Distributed Feedstocks
To this end, we further develop a systematic design and synthesis framework by coupling GRAMS with an in-house simulation-based constrained grey-box optimizer . The formulated framework simultaneously optimizes SERP cycle configuration, column design specifications and process operating conditions. The major modeling contributions include a generalized boundary-condition formulation for representing different operation modes in an SERP cycle, and the use of continuous pressure variables for selecting discrete operation modes and flow directions. The framework has been successfully demonstrated for optimal operation of three SERP systems, namely SE-SMR, SE-WGSR and sorption-enhanced methanol (SE-MeOH). For periodic SE-SMR, we design a process that produces 95% pure hydrogen from natural gas with 35% higher productivity and 10.86% lower cost in comparison to existing small-scale, distributed systems. In case of SE-MeOH, a novel process is obtained where methanol is synthesized from syngas with single-pass carbon conversions >80% and a production capacity of 109500 tons per year, with significant savings in energy consumption and process economics.
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