Flameless combustion heat accumulating type flat flame combustion nozzle

Abstract

The invention discloses a flameless combustion heat accumulating type flat flame combustion nozzle. A combustion nozzle body is internally provided with an air or smoke gas passage, a porous heat accumulator, a combustion cavity, a gas pipeline and an ignition device, wherein the tail end of the air or smoke gas passage is provided with a tangential air inlet duct positioned along the tangential direction of the circumferential combustion cavity, and the air or smoke gas passage is connected with the combustion cavity through the tangential air inlet duct; the tail end of the gas pipeline is provided with a flame combustion gas pipe and a flameless combustion gas pipe which are parallel and respectively controlled by a flame combustion control valve and a flameless combustion control valve, and the aperture of a flameless combustion gas spray orifice positioned on the tail end of the flameless combustion gas pipe is smaller than that of a flame combustion gas spray orifice positioned on the tail end of the flame combustion gas pipe. The flameless combustion heat accumulating type flat flame combustion nozzle has high energy utilization efficiency and good furnace temperature uniformity and can greatly reduce the discharge amount of NOX; fuel is sprayed at high speed through the necking spray orifice, thereby effectively controlling the flame temperature and being beneficial tothe sufficient combustion of the fuel; and in addition, the flame sprays into a furnace cavity with a very short spraying distance so as not to spray to parts inside the furnace cavity.

Description

Technical field [0001] The invention relates to a high, medium and low temperature fuel industrial furnace burner, in particular to a flameless combustion regenerative flat flame burner for high, medium and low temperature fuel industrial furnaces. Background technique [0002] Regenerative combustion technology is currently the best energy-saving combustion technology in the world. Its principle is to use paired burners with regenerators for controlled combustion. When one burner burns, the other burns Inhale and exhaust smoke, the high temperature flue gas exchanges heat energy with the heat storage body when passing through the heat storage body, the heat storage body absorbs heat, and the temperature of the high temperature flue gas is reduced; after a certain period of time, the heat storage body is saturated with heat, and then reverses. When a burner burns, cold air or fuel enters the burner from the heat storage body that has absorbed heat at a higher temperature, and is ...

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Problems solved by technology

[0003] In addition, in the regenerative burner of the prior art, since the flame temperature can reach above 2000°C, it is easy to burn out the pipes and other components around the open flame, resulting in shortened service life; especially the metal pipes, after a period of use burnt out and unusable

However, if a high-temperature-resistant ceramic pipe is used, although the high-temperature resistance performance is improved, the ceramic pipe is prone to embrittlement and damage under the repeated alternating action of cold and heat in the regenerative combustion process, and its service life is still not long

[0004] Finally, due to the different sizes and stacking methods of the parts to be heated in the furnace of the industrial processing furnace, some parts must be close to the flame nozzle of the burner, and the flame ejected from the nozzle is injected into the furnace. Longer, easy to directly spray and surround the parts; the parts near the flame nozzle are directly surrounded by the flame and directly in contact with the open flame, and the high-temperature (up to 2000 ℃ or above) open flame is directly sprayed on the parts and heated , leading to the local temperature of this part of the parts is too high, the temperature of this part of the parts is higher than other parts, the temperature rises faster, and the uniformity of the temperature is reduced. At the same time, the high-temperature open flame can affect the heat treatment effect of the parts and reduce its multiple properties index

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