Self pre-heating type high-speed burning nozzle and control method thereof.

Abstract

The invention belongs to the field of combustors and relates to a self pre-heating type high-speed burning nozzle and a control method thereof. A fuel gas supplying pipe is provided with a radial jetting fuel gas supplying pipe and an axial jetting fuel gas supplying pipe; through a fuel gas adjusting plate arranged at a fuel gas supplying pipe inlet position, the proportion of fuel jet in the radial direction and fuel jet in the axial direction is automatically adjusted; a combustion chamber penetrates through the middle of a flue gas flow guiding device; after air pass through a pre-heater,part of the air directly flows into a main combustion space from a gap between the combustion chamber and the flue gas flow guiding device, and remaining air flows into the combustion chamber and is sprayed into the main combustion space when reacting with fuel gas; and the gap between the combustion chamber and the flue gas flow guiding device is increased along with rising of the temperature. According to the self pre-heating type high-speed burning nozzle and the control method thereof, due to the fact that the pre-heater expands due to heating, the position of the flue gas flow guiding device is adjusted, and the air grading proportion is controlled; meanwhile, the fuel grading proportion is correspondingly adjusted, flame stability under the medium and low temperature state can be effectively guaranteed, the flame length under the high temperature state can also be automatically lengthened in a pulling manner, the flame local high temperature is controlled, temperature uniformityis improved, and NOx emission is lowered.

Description

technical field [0001] The invention belongs to the field of burners, and relates to a self-preheating high-speed burner and a control method thereof. Background technique [0002] Self-preheating high-speed burners are widely used in metallurgical heat treatment furnaces, but the high combustion intensity in the small-space combustion chamber results in relatively high NOx emission values, and a considerable number of products have low-temperature The disadvantage of unstable flame. Contents of the invention [0003] In view of this, in order to solve the above-mentioned problems existing in the existing self-preheating high-speed burner, the present invention provides a self-preheating high-speed burner, which not only ensures the flame stability of the burner at low temperature, but also can control the higher temperature Local high temperature and NOx emission indicators under conditions. [0004] In order to achieve the above object, the present invention provides a...

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Problems solved by technology

[0002] Self-preheating high-speed burners are widely used in metallurgical heat treatment furnaces, but the high combustion intensity in the small-space combustion chamber results in relatively high NOx emission values, and there are also quite a few products that exist at low temperatures. Disadvantages of unstable flame

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