Ultra-low nitrogen oxide combustion apparatus using internal recirculation of combustion gas and method therefor

Abstract

An ultra-low nitrogen oxide combustion apparatus according to the present invention comprises: a primary fuel jetting body; one or more secondary fuel jetting bodies; a recirculation guide unit; a fuel supply unit; an oxidant supply unit; and an air multistage sleeve. The primary fuel jetting body supplies main fuel into a combustion furnace. The one or more secondary fuel jetting bodies are arranged around the primary fuel jetting body in such a manner that the front ends thereof are inserted into the combustion furnace. The recirculation guide unit re-supplies combustion gas generated from the combustion furnace to the combustion furnace by hydrodynamic force. The fuel supply unit supplies fuel to the primary fuel jetting body and the secondary fuel jetting bodies. The oxidant supply unit supplies an oxidant to a gap between the primary fuel jetting body and the secondary fuel jetting bodies. The air multistage sleeve is arranged to surround the primary fuel jetting body for air multistage. The oxidant supplied from the oxidant supply unit is supplied in multiple stages through the internal and external portions of the air multistage sleeve. By applying an internal recirculation technique, the present invention can transmit combustion gas, generated in a combustion chamber including multiple flame areas, not to an external link pathway of the combustion chamber, but into the combustion chamber, without an additional separate device.

Description

technical field [0001] The present invention relates to ultra-low NOx combustion equipment using internal recirculation of combustion gases, and in more detail to ultra-low NOx combustion equipment using internal recirculation technology that can be used without other equipment Next, the combustion gas generated in the combustion chamber is delivered to the interior of the combustion chamber instead of the external connection passage of the combustion chamber. Background technique [0002] At present, the main energy sources of human beings are hydrocarbon fossil fuels. However, the problem of environmental pollution caused by the products of the combustion of such fossil fuels has been seriously mentioned. As the main source of environmental pollution, in addition to nitrogen oxides (NOx), carbon dioxide (CO 2 ), there are also carbon monoxide (CO) or soot (soot) generated due to incomplete combustion of fuel. [0003] Burners using existing fossil fuels cannot avoid the...

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Problems solved by technology

[0008] On the other hand, in the above-mentioned cited documents, as means for recirculating the exhaust gas, the exhaust gas is reflowed into the combustion furnace by having a plurality of exhaust gas supply pipes, recirculation ducts, and other equipment such as baffles, but it must be The above-mentioned components are separately installed outside the above-mentioned combustion furnace, so there is a disadvantage that a large space is required

[0009] On the other hand, Korean Registered Patent Publication No. 1203189, which was previously filed by the present inventor, provides an internal recirculation technology which, without other equipment, delivers the combustion gas generated in the combustion chamber to the inside of the combustion chamber instead of The external connection passages of the combustion chamber, but with the limitation that there is insufficient description of the specific structure used to form the lean flame in the central part of the furnace or the specific factors that can reduce the formation of nitrogen oxides

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