Low emissions burner

Details Low emissions burner Low emissions burner

1994-11-03

1996-11-12

Bennett, Henry A.

Heating

Tumbler-type rotary - drum furnace

Having combustion products generated in or fed to drum

432103, 432164, 432186, 432189, 431 12, 431159, 431181, 431187, 431254, 431284, F27B 702

Patent

active

055733964

ABSTRACT:
A premix burner assembly for heating the combustion chamber of a dryer for an HMA plant, soil remediation plant, or the like is designed to meet the very low emission limitations that are imposed in certain areas such as the southern portion of California. The burner assembly includes a burner, a primary nozzle, an air source connected to the burner, a fuel source, and a fuel injection system connected to the fuel source and to the burner. Premixing is achieved through the supply of a gaseous fuel from the fuel injection system into the burner upstream of the primary nozzle so as to lead to nearly complete premixing of the air and fuel prior to discharge into the combustion chamber, thereby permitting combustion of the fuel with only very small amounts of excess air. Burner efficiency is increased and emissions are further reduced by employing air distribution and control devices upstream of the fuel injection system and by carefully controlling the supply of both air and fuel to the burner. Preferably, burner firing is controlled by three separate controllers including a master firing rate controller, a gas supply controller, and an air supply controller which communicate with one another in different manners depending on whether or not the firing rate is increasing at a particular time.

REFERENCES:
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patent: 4428309 (1984-01-01), Chang
patent: 4688496 (1987-08-01), Schreter
patent: 4867572 (1989-09-01), Brock et al.
patent: 5062792 (1991-11-01), Maghon
patent: 5088916 (1992-02-01), Furuhashi et al.
patent: 5211331 (1993-05-01), Seel
patent: 5334012 (1994-08-01), Brock et al.
patent: 5388985 (1995-02-01), Musil et al.
patent: 5407345 (1995-04-01), Robertson et al.

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