SYSTEM AND METHOD FOR STACK HEAT RECOVERY
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United States of America Patent
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Issued Date -
Jul 4, 2024
app pub date -
Feb 4, 2022
filing date -
Feb 4, 2022
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Abstract
A system and method are presented for recovering heat from flue gas produced by a recovery boiler in a pulp and paper mill, the recovery boiler having a flue stack. Flue gas is drawn from the flue stack and passed through a first and second condensing heat exchangers before exiting through a separate stack. The first heat exchanger is used to heat boiler feedwater whereas the second heat exchanger is used to produce process hot water for use in the pulp and paper mill. Steam previously used to heat the boiler feedwater and produce the process hot water can now be used to generate electricity that can be used for the pulp and paper mill operations or to export to the electrical power grid.
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