Liquid heaters and vaporizers – Feed heaters – Furnace gases
Patent
1986-04-01
1987-04-28
Favors, Edward G.
Liquid heaters and vaporizers
Feed heaters
Furnace gases
122 1C, 122 20B, 122451S, F22D 102
Patent
active
046605118
ABSTRACT:
A method and apparatus for recovery of heat from the flue gas of the combustion furnace of a steam boiler or power generation plant uses a heat pump heat extracted from a lower temperature point in the system to a higher temperature point in the system. The flue gas is passed through an economizer to preheat the boiler feed water. The flue gas then passes to a direct contact gas cooler where a second stream of cooling water extracts heat from the flue gas. The second stream of cooling water is passed through the evaporator of the heat pump to heat a refrigerant. The refrigerant is compressed and then condensed in thermal contact with the boiler feed water to heat it before it enters the economizer. In a second embodiment a power generation plant has a steam turbine and an auxiliary vapor turbine. The flue gas is passed through a gas cooler and gives up heat to a stream of cooling water. The heat is extracted from stream of cooling water and pumped by a heat pump to heat a stream of refrigerant which drives the vapor turbine thus generating additional power. A third embodiment is also disclosed.
REFERENCES:
patent: 4489679 (1984-12-01), Holt
patent: 4491093 (1985-01-01), Hoekstra
patent: 4501233 (1985-02-01), Kusaka
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