Graded low-nitrogen gas combustor based on rotational flow

Abstract

The invention provides a graded low-nitrogen gas combustor based on rotational flow. The graded low-nitrogen gas combustor comprises a combustor barrel body, a connecting barrel body and a combustor hood which are sequentially arranged, the diameter of the combustor barrel body is smaller than that of the combustor hood, the diameter of the connecting barrel body is gradually increased in the direction from the combustor barrel body to the combustor hood, a rotational flow flame stabilizing disc is further arranged between a main fuel gas spray pipe and an auxiliary fuel gas spray pipe, the rotational flow flame stabilizing disc comprises a first cylinder and a second cylinder which are coaxially arranged, the first cylinder is arranged inside the second cylinder, a first rotational flow blade is arranged between the first cylinder and the second cylinder, a flame stabilizing disc end part is further arranged in the circumferential direction of the second cylinder, a second rotationalflow blade is arranged between the second cylinder and the flame stabilizing disc end part, and the distance between the first rotational flow blade and the combustor barrel body in the central axis direction is smaller than the distance between the second rotational flow blade and the combustor barrel body in the central axis direction. By means of the technical scheme, the mixing degree of gas can be enhanced, and therefore the key performance of a combustor is improved.

Description

technical field [0001] The invention relates to the field of burners, in particular to a swirl-based staged low-nitrogen gas burner. Background technique [0002] With the stricter restrictions on NOx or nitrogen oxide emissions in environmental protection policies, the low-nitrogen transformation of burners is urgent. According to the research report, the main factors affecting the formation of NOx in flue gas can be summarized into three aspects: the first aspect is related to the characteristics of the fuel, the more nitrogen in the fuel, the easier it is to form NOx. The second aspect is related to some technical parameters in the combustion process, such as when the combustion temperature reaches a certain critical temperature, the NOx content increases exponentially with the temperature. The third aspect has to do with the type of burner. [0003] As the NOx emission problem has attracted more and more attention from the society, the national NOx emission standards h...

AI Technical Summary

Problems solved by technology

At present, the market demand for ultra-low NOx gas burners is large. The air flow path of the existing low-NOx burners is a separate sealed channel, and the air can only be mixed with the gas at the outlet of the channel, which is not conducive to the full mixing of gas and air. Mixed combustion causes problems such as incomplete combustion, unstable combustion and NOx emissions that do not meet environmental protection requirements

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