초록 ▼

A combustion apparatus for staged combustion inside the Morison tube of a firetube boiler for lowering the concentration of NOx in the exhaust gases. Combustion occurs in a first and second stage, the first stage being sub-stoichiometric combustion and the second stage being above-stoichiometric com

A combustion apparatus for staged combustion inside the Morison tube of a firetube boiler for lowering the concentration of NOx in the exhaust gases. Combustion occurs in a first and second stage, the first stage being sub-stoichiometric combustion and the second stage being above-stoichiometric combustion. In two embodiments of the combustion apparatus, the first stage combustion occurs directly adjacent the inlet end of the boiler furnace and the second stage combustion occurs inside the boiler furnace which acts as a combustion apparatus. In other embodiments of the combustion apparatus, both the first and second stage combustion occur inside the boiler furnace which acts as a combustion apparatus. Swirling and/or cyclonic combustion is utilized in the first and second stages of the combustion apparatus. There is provided heat exchange means surrounding and extending substantially throughout the axial length of the combustion chamber, i.e., the boiler furnace, for absorbing heat and cooling the combustion gases therein.

대표청구항 ▼

A combustion apparatus for minimizing the formation of NOx, the apparatus comprising: an elongated combustion vessel having along its axial length a first and second combustion portion for sub-stoichiometric and above-stoichiometric combustion, respectively, the first and second portions being in co

A combustion apparatus for minimizing the formation of NOx, the apparatus comprising: an elongated combustion vessel having along its axial length a first and second combustion portion for sub-stoichiometric and above-stoichiometric combustion, respectively, the first and second portions being in communication and the combustion vessel including a substantially cylindrical wall; means for supplying fuel into the first portion of said combustion vessel; means for supplying a first stream of air into said first portion of said combustion vessel in an amount sufficient to form a fuel rich ratio for sub-stoichiometric combustion within the first portion of said combustion vessel; means for tangentially supplying a second stream of air into the second portion of said combustion vessel to mix with the sub-stoichiometric combustion product gases and create a swirling air flow for above-stoichiometric combustion in said second combustion portion; means for forming a cyclonic flow pattern of hot gases within at least one of said first and second combustion portions of said combustion vessel; a cooling chamber extending rearwardly of the second portion of the combustion vessel for cooling the exhaust gases exiting from the second portion; a gas swirler disposed between the second portion of the combustion vessel and the cooling chamber for promoting a swirling air flow thereby enhancing heat transfer; and heat exchange means surrounding at least the second portion of said combustion vessel for maintaining the temperature in the combustion vessel at less than about 2000°F. throughout its operation.