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Exhibit 17: Limitations of Currently Available Waste Heat Recovery Technologies, Medium Temperature Ranges Equipment Limitations and Barriers Metallic recuperators Economic justification for exhaust gas temperature below about 1,000°F (540°C) Economically justifiable heat recovery efficiency – 40%–60% High maintenance for use with gases containing particulates, condensable vapors, or combustible material Fouling of heat transfer surfaces In some cases, difficulty in maintaining or cleaning the heat transfer surfaces Recuperative burners Lower heat recovery efficiency (usually less than 30%) Limited size availability (usually for burners with less than 1 MM Btu/hr) Cannot be applied to processes where exhaust gases contain particles and condensable vapors Rotary regenerators Seals between the high-pressure and low-pressure gases (air) Plugging of exhaust gas passages when the gases contain particulates High pressure drop compared to recuperators Maintenance and operation reliability for rotary mechanism Shell and tube heat exchanger for heating liquid (water) Fouling of heat transfer surfaces when the gases contain particulates or condensable liquids Condensation of moisture at selected cold spots and resulting corrosion Another approach would be to develop a matrix according to the type of equipment available in the market. Considerations would include its application range, in terms of temperatures and heat source characteristics; performance level; and limitations with respect to industrial applications. Industrial Waste Heat Recovery Page 34PDF Image | Industrial Waste Heat Recovery: Potential
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