Retrofit strategy for the site-wide mitigation of CO2 emissions in the process industries

• Holistic analysis of opportunities to reduce CO2 emissions by reducing demand, optimizing heat and power generation and fuel switching.
• Systematic approach applies a hierarchical procedure for conceptual design and re-design.
• Trade-offs between cost and emissions reduction strategies are evaluated.

The combustion of fossil fuels for providing heat and power in the process industries is a major contributor of CO2 emissions. Heat integration methods have been widely used for energy-saving retrofit projects to improve the energy efficiency of process plants, reducing fuel consumed and consequently CO2 emissions. It is not straightforward to identify the most appropriate strategy for CO2 emissions reduction, as a wide range of options are available, including fuel switching, reducing energy demand through efficiency improvements, retrofit of heat exchanger networks, etc. The economic impact and design constraints of each option need to be considered. A systematic approach is presented to allow evaluation of trade-offs between the cost of emissions reduction options and the effect on overall CO2 emissions. The approach applies a hierarchical conceptual design procedure. The proposed procedure is applied to a case study to demonstrate how an economic retrofit solution to reducing site-wide CO2 emissions can be systematically developed and evaluated.

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