Hot gas recirculation type burning furnace

Details Hot gas recirculation type burning furnace Hot gas recirculation type burning furnace

1977-10-04

1980-01-15

Yuen, Henry C.

Furnaces

With exhaust gas treatment means

Recirculation means

110205, 110207, 110212, F23G 706

Patent

active

041833066

ABSTRACT:
This invention relates to a burning furnace of hot gas recirculation type for minimizing fuel cost. The furnace includes a cyclone which receives dust-containing exhaust gases. One or more secondary air-introducing nozzles are provided for the cyclone at top of or in close proximity to the upper end of the cyclone leading concentrically to a flue gas passage such as funnel. Upon introducing secondary air under pressure into the cyclone, a downwardly directing swirling air flow is formed therein for the separation of heavier dust together with part of the fed exhaust gases. The thus separated air-hot gas mixture including heavier dust particles is returned to initial stage of the furnace for the recirculation through the furnace. Lighter combustible soot or the like particles are burnt in a flame curtain formed in the cyclone and finally discharged together with main and substantially dust-free exhaust gas portion constituting an upwardly directing swirling core flow in the downwardly directing and swirling outer air flow, into the flue gas passage.

REFERENCES:
patent: 1729763 (1929-10-01), DeFlorez
patent: 1970109 (1934-08-01), Stratton
patent: 2917011 (1959-12-01), Korner
patent: 3364589 (1968-01-01), Muller
patent: 3452968 (1969-07-01), Shimizu et al.
patent: 3494047 (1970-02-01), Geiger et al.
patent: 3567399 (1971-03-01), Altmann et al.
patent: 3600817 (1971-08-01), Klein
patent: 3601069 (1971-08-01), Mancuso
patent: 3638591 (1972-02-01), Lansmann
patent: 3740865 (1973-06-01), Laguilharre
patent: 3939781 (1976-02-01), Adams
patent: 4030876 (1977-06-01), Akae
patent: 4048927 (1977-09-01), Augustin et al.

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