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US 4,067,382 AGranted
Heat reclaim system
AssigneeThe Hanna Mining Company
InventorAlan English
Life of this patent
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AssigneeThe Hanna Mining Company
InventorAlan English
Estimating the term…
A heat reclaim system for reclaiming waste heat from a material processing line by bleeding a portion of the heated air from one or more points on the material heat processing line and directing such heated air through an economizer containing a bank of serpentine coils. Water is pumped through the economizer coils to extract heat from the air, and the heated water leaving the economizer is piped to another heat exchanger where the reclaimed heat is extracted from the water for use in other processes. More than one economizer may be provided in each heat reclaim system for receiving bleed-off air from different points on the material heat processing line, with the economizers connected in series to obtain the highest temperature difference between the air and water. Separate waste heat reclaim systems should be provided for each material heat processing line, with separate controls for each of the heat reclaim systems to permit the heat reclaim systems to operate independently of the other systems so that any one line may be shut down without affecting the operation of the other lines.
A heat reclaim system for reclaiming waste heat from a material heat processing line comprising means for bleeding heated air from a plurality of points on a material heat processing line, an economizer containing a bank of serpentine coils, means for circulating water through said coils, means for directing such heated air through said economizer in a single pass to permit extraction of heat from the air by the water flowing through said coils to heat the water, heat extraction means for subsequently extracting the heat from the water after leaving said economizer for use in other processes, and means providing a closed water system permitting continuous flow of the water between said economizer and heat extraction means, each said means for bleeding heated air from the material processing line comprising a supply air conduit for passage of heated air from a point on the material heat processing line to said economizer, a supply air valve for selectively opening and closing said supply air conduit, a bypass conduit for passage of heated air from such point on such material heat processing line to a stack, a bypass air valve for selectively opening and closing said bypass conduit, and means for closing said supply air valve and opening said bypass air valve for stopping air flow through said economizer in response to a drop in the bleed air temperature below a predetermined level to provide automatic dew point safety control.
A heat reclaim system for reclaiming waste heat from a material heat processing line comprising a plurality of supply air conduit means for bleeding heated air from a plurality of points on a material heat processing line, an economizer containing a bank of serpentine coils, means for circulating water through said coils, a drop-out box for receiving bleed air from said plural supply air conduit means to mix the bleed air prior to passage through said economizer, adjustable orifice means in each of said plural supply air conduit means for equalizing the pressure of such heated bleed air in said supply air conduit means prior to entry into said drop-out box, means for directing such heated air from said drop-out box through said economizer in a single pass to permit extraction of heat from the air by the water flowing through said coils to heat the water, heat extraction means for subsequently extracting the heat from the water after leaving said economizer for use in other processes, and means providing a closed water system permitting continuous flow of the water between said economizer and heat extraction means.
Dependencies are inferred from the claim text.