A new incentive: payback costs of environmental control in the melting shop by adding heat recovery systems.
Proceedings of the symposium on occupational health hazard control technology in the foundry and secondary non-ferrous smelting industries, December 10-12, 1979, Chicago, Illinois. Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 81-114, 1981 Aug; :222-229
Heat recovery systems were reviewed as a viable approach to reducing fuel consumption in foundry melting processes in order to limit the cost of emission control systems, especially for foundries that cannot afford the high expenditures involved in the installation of such systems. Recovery of heat from all foundry melting operations was examined in detail, especially electric arc furnaces, gas fired furnaces, and the cupola. Electric arc furnace exhaust hoods have been shown to be well suited to the recovery of direct heat by direct evacuation. The heat extracted from gas fired furnaces can be used effectively to preheat the combustion air for the burner equipment, which can result in as much as 20 percent or more fuel savings. Hot cupola waste gases were considered well suited for such uses as hot blast tuyere air, preheat afterburner combustion air, and hot curtain at the charge. One advantage of cupola heat recovery was that it enhanced the emission control system by maintaining longer periods of high temperature, which allowed nearly complete hydrocarbon incineration, and by reducing problems in the dust collection system. Payback analysis for a heat recovery system for a cupola having a diameter of 183 meters revealed that the cost of such a system can be recovered in 2 years. The use of heat exchangers to retrieve the heat from the stream of dirty gases generated in the cupola was examined briefly.
NIOSH-Contract; Contract-210-79-0048; Air-quality-control; Occupational-exposure; Control-equipment; Industrial-equipment; Primary-metallurgical-processes; Equipment-design; Blast-furnaces; Heat-production
Proceedings of the symposium on occupational health hazard control technology in the foundry and secondary non-ferrous smelting industries, December 10-12, 1979, Chicago, Illinois