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Use of advanced heat exchangers for evaporators and condensers that use direct gas-air heating for the evaporators and air for condensers. This would eliminate secondary heat exchanger loops such as producing hot water or steam for the evaporators as well as the need for cooling towers for the condenser. This would reduce costs as well as eliminate inefficiencies introduced with the use of secondary heat exchanger circuits. Secondary heat recovery systems for flue gases discharged from regenerators. These gases are at temperatures from 800°–1,200°F (430°–650°C). The gas temperature is cyclic and, in some cases, the gases contain very small amount of particulates, which are easy to remove. Glass batch drying and preheating systems using exhaust gases from the melting furnace or refining forehearth section exhaust gases. Previously developed systems have not been used by the industry due to a variety of issues related to operations and maintenance. A new approach or design is required. Hot gas cleanup systems for use by medium- to low-temperature gases prior to secondary heat recovery. Use of CHP systems for generating hot gases for use in annealing ovens. The system will deliver electricity as well as hot air with reduced but sufficient oxygen for use as combustion air. Use of heat from annealed products. The heat is available at temperatures below 500°F. Opportunities for the Paper Industry Development of heat recovery or energy conversion systems for low-temperature (<140°F or 60°C) heat sources, such as exhaust gases, that may contain water vapor and other contaminates, such as small amount of fibers or duct. A system for dehumidifying high-temperature (≥140°F or 60°C) air containing fibers or dust. Development of heat recovery from low-temperature water (<100°F or 37°C) for use in the plant. Development of a drying system for solids, using waste heat from the exhaust gases. Opportunities for Steel Mini-mills (EAF Furnaces and Rolling Mill) Heat recovery from EAF exhaust gases. Options could include hot gas clean up, controlled combustion of combustibles to manage reaction temperatures while avoiding melting of steel oxides and other solid contaminants, and heat recovery from highly contaminated (e.g., particulate and condensable oil vapors) gases. Recovery of heat from surfaces of hot ladles. The heat is in the form of radiation and convection and the ladles are moved from one location to another during the day. Heat recovery from cooling water used in the continuous casting process and reheat furnace cooling (e.g., walking beam furnaces or thin-slab reheating roller hearth furnaces) Secondary heat recovery from reheat furnaces downstream of conventional heat recuperators to recover additional heat. One option is preheating the product entering the furnace. Issues to be addressed include the location of the heat source and heat use, available space, and the infrastructure or logistics of transporting heat to the desired location. Heat recovery from hot cooled products. This could be medium- or low-grade heat. Opportunities for Coating Plants Secondary heat recovery from regenerative thermal oxidizers (RTOs) exhaust gases that are available from 350°–400°F (180°–200°C). Industrial Waste Heat Recovery Page 38PDF Image | Industrial Waste Heat Recovery: Potential
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