Industrial Waste Heat Recovery: Potential

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Industrial Waste Heat Recovery: Potential ( industrial-waste-heat-recovery-potential )

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Opportunities in Basic Research  Heat transfer o Enhancement of heat transfer for air or other gases to reduce the size of heat exchangers. This could include advancements in heat transfer surfaces in shape, configuration, coatings, and changes in fluid flow patterns through innovative flow patterns, changes in gas compositions, or other methods that could make significant improvements in convection heat transfer for the gases. o Radiation heat transfer enhancement to take advantage of thermal radiation emission properties of gases such as CO2 and H2O that are present in combustion products of commonly used fossil fuels. This may include using reradiation surfaces or geometrical modifications.  Particulate removal or gas cleaning o Particulates filtering of particulate laden gases in all temperature ranges through innovative methods of increasing filtering efficiency with minimized pressure drop. Of particular interest is cleaning or filtering of high-temperature gases encountered in industries such as EAF (mini-mills), glass, cement and lime kilns, aluminum melting, and steel melting. o Innovative methods of avoiding or reducing particulate deposition on heat transfer surfaces. This can be used to retard or remove deposits of organic materials (e.g., oil vapors) or inorganic materials (e.g., boron vapors) present in glass melting furnaces, ash in coal fired boilers, and oxides in steel or aluminum melting furnaces. o Particulate removal methods for high-temperature heat transfer surfaces, particularly materials deposited at high temperatures.  Gas or vapor separation o Selective separation of water vapor or steam, CO2, oil, or organic liquid vapors from exhaust gases at high temperatures (greater than the condensation temperature of the selected materials) without the need for cooling the entire gas mass. This may include membranes or other methods such as high-temperature desiccant or molecular sieves to absorb or adsorb water vapor or other gases selectively. o Reactive systems (i.e., controlled combustion for organic vapors) to remove or collect organic vapors and combustible gases or vapors with controlled reaction rates and temperature increases. Opportunities in Advanced Materials  Corrosion-resistant coatings for low-temperature applications.  High-temperature (>1,600°F or 870°C) corrosion resistant materials for heat exchangers (recuperators).  Heat storage materials with high latent heat, thermal capacity (specific heat), and thermal conductivity for all temperature ranges.  Seal materials for high-temperature heat exchanger designs with moving parts (e.g., heat wheels or regenerators). The seal can be for metal-to-metal interface or metal-to-non-metallic materials (e.g., ceramics).  Polymers or plastics with improved thermal conductivity for use in low-temperature corrosive environments (e.g., combustion products of fossil fuels). Industrial Waste Heat Recovery Page 40

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