Two-stage heat exchanger

Details Two-stage heat exchanger Two-stage heat exchanger

1980-01-28

1981-06-30

O'Connor, Daniel J.

Stoves and furnaces

Hot-air furnaces

Compressed air

126 99A, 126108, 126116R, 126117, 165 71, 165128, 165DIG2, 237 55, F24H 302, F16F 134, F24B 700

Patent

active

042757053

ABSTRACT:
Improved furnaces are described in which secondary and tertiary heat exchanges are incorporated into new and existing hot-air furnace systems for controlled cooling of hot combustion products by co-current and countercurrent heat exchanges. Hot combustion products are cooled to a temperature at which latent heat of water vapor contained in combustion gases are substantially recovered.
In one embodiment of our invention, a secondary heat exchanger comprises inter alia a closed hollow annular drum concentric with and spaced from a cylindrical combustion chamber, said annular drum having an upper annulus preferably filled with randomly packed refractory material.
A second embodiment of our invention comprises a closed double-annuli drum heat exchanger concentric with and spaced from a cylindrical combustion chamber.
Finned tube or thermosiphon heat exchangers can be arranged sequentially with the primary heat exchanger combustion chamber to function as a secondary heat exchanger or as a tertiary heat exchanger.

REFERENCES:
patent: 600909 (1898-03-01), Elmendorf
patent: 2102592 (1937-12-01), Hayne
patent: 2228602 (1941-01-01), Kolb
patent: 2296545 (1942-09-01), Tichbourne
patent: 2355495 (1944-08-01), Zier
patent: 2466868 (1949-04-01), Scott
patent: 2508131 (1950-05-01), Zink
patent: 4003407 (1977-01-01), Finger
patent: 4020823 (1977-05-01), Baumbach
patent: 4079885 (1978-03-01), Decker
patent: 4171089 (1979-10-01), Schossow

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