Advanced flash exhaust heat recovery
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United States of America Patent
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Dec 8, 2020
Grant Date -
Jul 4, 2019
app pub date -
Mar 8, 2019
filing date -
Jul 15, 2016
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Waste heat is extracted in two stages from the exhaust (20) of a biomass dryer (14) in a grain alcohol plant (10). A boiler circuit (56) provides a first steam at high pressure. A first energy recovery circuit (36) extracts heat from the exhaust via a non-contact heat exchanger (24) and provides a second, relatively lower pressure steam (78), thereby bypassing a portion of the boiler circuit. Working fluids in the boiler and first energy recovery circuits are maintained within boiler water quality specifications and are intermixed to allow the production of the second steam without a pressure reduction device. A second energy recovery circuit (44) extracts heat from the exhaust downstream of the first energy recovery circuit using a direct contact heat exchanger (38) and provides a non-boiler quality heated fluid (52), which may be a heated liquid or a third steam.
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