Method of reducing the nox-emissions during combustion of nitrog

Details Method of reducing the nox-emissions during combustion of nitrog Method of reducing the nox-emissions during combustion of nitrog

1986-12-03

1988-12-13

Jones, Larry

Combustion

Process of combustion or burner operation

Flame shaping, or distributing components in combustion zone

431 4, 110261, 110186, 110265, F23C 500

Patent

active

047907436

ABSTRACT:
A method of reducing the NO.sub.x --emissions during combustion of nitrogen-containing fuels via burner units each including a primary burner and being arranged in a wall of a closed combustion chamber; fuel and air for combustion are supplied to the burner flame in stages as partial flows via delivery means which are separate from one another. With a number of primary burners being arranged one above the other the method is carried out in three steps: feeding coal dust along with its carrier gas to the primary burner and generating a primary flame zone having a strong internal back flow region and burning the coal dust under fuel-rich conditions, feeding reduction fuel into the combustion chamber and generating a secondary flame zone in the vicinity of the primary flame zone and being operated under more-fuel-rich conditions than the primary flame zone, feeding reduction fuel into the combustion chamber and generating a secondary flame zone in the vicinity of the primary flame zone and being operated under more-fuel-rich conditions than the primary flame zone, and feeding state air into the combustion chamber of the secondary flame zone and being operated under fuel lean conditions.

REFERENCES:
patent: 4057021 (1977-11-01), Schoppe
patent: 4089628 (1978-05-01), Blackburn
patent: 4117075 (1978-09-01), Sano
patent: 4480559 (1984-11-01), Blaskowski

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