ECCENTRIC JET TYPE LOW NOx OXYFUEL BURNER

Abstract

Disclosed is an eccentric jet type low NO_X oxyfuel burner for gaseous fuel, which freely controls the shape of a flame and a combustion characteristic by using an eccentric injection nozzle. The disclosed oxyfuel burner reduces an optimum mixture rate forming area in comparison with a conventional coaxial-injection, and enlarges a thin fuel area and an excessive fuel area so that partial generation of a flame with a high temperature is restricted. Therefore, an amount of generated nitrogen oxide can be minimized and the stability of a flame can be significantly improved. Particularly, the oxyfuel burner combines a fuel nozzle and an oxygen combustion nozzle having different diameters so as to use them so that it is very simple and practical to design and manufacture the oxyfuel burner.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a low NOX oxyfuel burner, and more particularly to a low NOX oxyfuel burner for gaseous fuel, which can freely control the shape of a flame and combustion characteristics and uses oxygen of low purity.[0003]2. Description of Related Art[0004]An oxyfuel burner applied to thermal equipment used for industrial and commercial purposes requires a high combustion efficiency, and a performance which minimizes the generation of pollutants and achieves variable and stable flame characteristics, as well as structural simplicity and endurance.[0005]A conventional low NOX oxyfuel burner performs a method for dividing and injecting oxygen or fuel in a multistage manner and has spatially various mixture rates according to each division rate.[0006]In other words, the conventional oxyfuel burner divides fuel and oxygen into fuel at low concentration and oxygen at high concentration or into oxygen at low...

AI Technical Summary

Benefits of technology

[0015]The oxyfuel burner according to the present invention reduces an optimum mixture rate forming area in comparison with a conventional coaxial-injection, and enlarges a thin fuel area and an excessive fuel area so that partial generation of a flame with a high temperature is restricted. Therefore, an amount of generated nitrogen oxide can be minimized and the stability of a flame can be significantly improved.

[0016]Particularly, the oxyfuel burner according to the present invention combines a fuel nozzle and an oxygen combustion nozzle having different diameters so as to use them so that it is very simple and practical to design and manufacture the oxyfuel burner.

[0017]Also, the oxyfuel burner flame can achieve a flame of various shapes and a combustion characteristic according to the rotation of a fuel combustion nozzle (or an oxygen combustion nozzle), thereby flexibly functioning as a low-pollution heating control apparatus applied to a thermal process in various industries.

Problems solved by technology

Meanwhile, in a case of a low NOX oxyfuel burner performing combustion by directly injecting fuel at high speed, the high-speed direct-injection of fuel is impossible at an early stage of operation, because a temperature is low so that flame stability and combustion efficiency are low due to the structure of a nozzle.

Herein, such a flame range of a high temperature inevitably expands so that a nitrogen oxide can be excessively generated.

Therefore, in order to prevent this, the shape of a nozzle of a burner may be complicated and there is a difficulty in manufacturing and assembling.

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