Power plants – Combustion products used as motive fluid – With exhaust treatment
Patent
1977-03-25
1979-05-15
Casaregola, Louis J.
Power plants
Combustion products used as motive fluid
With exhaust treatment
266141, F02C 700
Patent
active
041540557
ABSTRACT:
An indirect Brayton cycle is employed for an energy recovery system useful for large mass flow applications, such as a cast-iron making cupola. Exhaust gases from the cupola (elevated in temperature due to conversion by burning to CO.sub.2 and due to elimination of cooling of the exhaust passages) are directed to a turbine (which extracts energy to drive a compressor and electrical generator), the exhaust gases are then expanded (reduced in pressure), passed through a heat exchanger to release additional heat units to an air supply feeding the cupola, and then through the compressor to be raised in pressure to ambient for dumping. The exhaust gases are roughly filtered prior to entry into the recovery system and fine filtered after leaving the system prior to dumping; the residual temperature of the fine filtered exhaust gases is about 390.degree. F.
In contrast, the direct Brayton cycle employed by the prior art for energy recovery (steam plants) conveys a fresh air supply to a compressor-turbine-generator combination, first raising the pressure and temperature of the air supply by the compressor, then passing the air supply through a heat exchanger for an additional temperature increase (receiving heat units from a trailing portion of the steam system) and then passing the air supply through a turbine for return to ambient pressure conditions with a residual heat content of about 850.degree. F.
REFERENCES:
patent: 2131031 (1938-09-01), Avery
patent: 2541532 (1951-02-01), Mosser
patent: 3369361 (1968-02-01), Craig
patent: 3449548 (1976-04-01), Lockwood
Pulick Michael A.
Topouzian Armen
Casaregola Louis J.
Ford Motor Company
Johnson Olin B.
Malleck Joseph W.
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