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Distillation with mechanical vapor recompression (IEA HPC 2004b). As part of modernization at a chemical plant, a new propylene-propane mechanical vapor recompression (MVR) distillation column was built. The MRV system provides annual energy cost savings of 3.5 million EUR and annual CO2 emissions reduction of 67,000 ton. The MRV system also reduces the use of cooling water. The system has a 2-year payback. Conclusions and Recommendations Manufacturing facilities offer great opportunities for waste-heat recovery. Medium-to- high temperature exhaust gases from fossil-fuel-fired furnaces, boilers, and other process heating equipment typically account for the greatest opportunities for passive waste-heat recovery in industry. However, the use of heat pumps to raise the temperature of low-temperature waste heat to a more suitable level for distillation, evaporation, drying, space heating, and water heating applications offers great potential too. Since less than 5% of US manufacturing facilities currently use waste-heat recovery, the potential for waste-heat recovery is tremendous in US industry. (DOE 2002, Table 8.2) Indeed, it is estimated that waste-heat recovery could substitute for 9% of total energy use by US industry—or 1.4 quadrillion BTU. (Energetics and E3M 2004) An added benefit of waste-heat recovery is the reduction in GHG emissions. Ultimately, a greater use of waste-heat recovery equipment by US industry will increase the industry’s global competitiveness. Industrial facilitates with significant energy use should conduct site-wide energy- efficiency assessments to identify opportunities to reduce energy intensity and identify waste- heat recovery and reuse opportunities. Incentive programs from utilities and federal and state agencies are available to offset all or part of the cost of a site-wide energy-efficiency assessment. The site-wide energy-efficiency assessment should: • Start with an energy balance of energy sources and uses (loads); • Identify waste-heat recovery and reuse opportunities; • Utilize pinch analysis, if applicable; • Consider new technology options, such as energy-efficient motors, adjustable speed drives, advanced controls, heat exchangers, heat pumps, electric boilers, energy-efficient lighting, combined heat and power, cogeneration, energy storage and distributed generation; • Identify and implement cost-effective projects that minimize energy intensity. References [CEC] California Energy Commission. 2007. Public Interest Energy Research Program, Public Workshop with Stakeholders, Industrial Efficiency RD&D Planning. Sacramento, CA: California Energy Commission. January 23. [DOE] Department of Energy. 2003a. Thermally Activated Technologies, Technology Roadmap. Washington, D.C.: U.S. Department of Energy, Energy Efficiency and Renewable Energy. © 2007 ACEEE Summer Study on Energy Efficiency in Industry 2-11PDF Image | Industrial Waste Heat Recovery Benefits and Recent Advancements in Technology and Applications
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