Ultra-low NOx combustion device

Abstract

The present invention relates to an ultra-low nitrogen oxide combustion apparatus using the internal recirculation of combustion gas and the optimization of fuel. The present invention provides an ultra-low nitrogen oxide combustion apparatus comprising: a combustion furnace; a burner having a side and an outer circumferential surface which are positioned at predetermined distance from the combustion furnace, the side being inserted into the combustion furnace; a main fuel injection body which is positioned at a center of the burner; an auxiliary fuel injection body positioned, which is surrounding the main fuel injection body and has the end portion introduced from one side end of the burner toward the other side end by a predetermined distance; a fuel recirculation port positioned near the auxiliary fuel injection body and on an outer circumferential surface of the burner; and a sensor for sensing a concentration of CO contained in combustion gas generated in the combustion furnace.

Description

technical field [0001] The present invention relates to an ultra-low nitrogen oxide combustion device based on internal recirculation of combustion gas. More efficient internal recirculation of combustion gases delivered from inside the combustion chamber, rather than by external connecting channels of said combustion chamber, is achieved through optimal control of the structure of the burner and fuel distribution for a more efficient flow of combustion gases. Background technique [0002] The main source of energy for humans today is hydrocarbon fossil fuels. However, the environmental pollution caused by the products of such fossil fuel combustion is serious. The main sources of environmental pollution are nitrogen oxides (NO x ), carbon dioxide (CO 2 ), as well as carbon monoxide (CO) and soot (soot) produced by incomplete combustion of fuel. [0003] In conventional burners using fossil fuels, NO and NO are inevitably produced due to chemical reactions during combust...

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Problems solved by technology

[0008] In the aforementioned Patent Document 1, additional devices such as a plurality of exhaust gas supply pipes, a recirculation duct, and a damper are provided as elements for recirculating the exhaust gas so that the exhaust gas reflows into the combustion furnace, The disadvantage, however, is that the device has to be additionally located outside the furnace, so that the required space becomes larger

[0009] On the other hand, regarding Patent Document 2, refer to the authorized patent previously applied by the applicant, such as Figure 4 As shown, an internal recirculation technology is provided, and the combustion gas 3', 4' generated in the combustion furnace 1' is transferred from the interior of the combustion furnace 1' to the interior of the burner 2' without additional devices, without passing through the combustion The external connection channel of the furnace is passed, but the disadvantage is that the flow of the combustion gas 4' in the partial area of ​​the combustion furnace 1' cannot be effectively used, and the control of the fuel supply amount is not considered

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