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Optimal discrete pipe sizing for tree-shaped CO2 networks

  • While energy-intensive industries like the steel industry plan to switch to renewable energy sources, other industries, such as the cement industry, have to rely on carbon capture storage and utilization technologies to reduce the inevitable carbon dioxide (CO2) emissions of their production processes. In this context, we investigate the problem of finding optimal pipeline diameters from a discrete set of diameters for a tree-shaped network transporting captured CO2 from multiple sources to a single sink. The general problem of optimizing arc capacities in potential-based fluid networks is a challenging mixed-integer nonlinear program. Additionally, the behaviour of CO2 is highly sensitive and nonlinear regarding temperature and pressure changes. We propose an iterative algorithm splitting the problem into two parts: a) the pipe-sizing problem under a fixed supply scenario and temperature distribution and b) the thermophysical modelling including mixing effects, the Joule-Thomson effect, and heat exchange with the surrounding environment. We show the effectiveness of our approach by applying our algorithm to a real-world network planning problem for a CO2 network in Western Germany.

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Author:Jaap PedersenORCiD, Thi Thai LeORCiD, Thorsten KochORCiD, Janina ZittelORCiD
Document Type:ZIB-Report
Tag:CO2 Transport; Network Design; Pipeline Sizing
Date of first Publication:2022/08/18
Series (Serial Number):ZIB-Report (22-15)
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