Low-NOx (nitrogen oxide) flat flame heat storage type burner using graded burning technique

Abstract

The invention relates to a low-NOx (nitrogen oxide) flat flame heat storage type burner using graded burning technique. The low-NOx flat flame heat storage type burner comprises a heat storage box, a burner casing, an air burning mixing head, flat flame burning bricks, a gas pipe, and an ignition burner, wherein the interior of the heat storage box is provided with a heat storage body; a burning chamber is arranged in the air burning mixing head; a flat flame burning chamber is arranged in the flat flame burning bricks; one end of the heat storage box is connected with an air port; one end of the gas pipe is communicated with the burning chamber, and the other end of the gas pipe is provided with a gas inlet; the ignition burner is communicated with the burning chamber, and the burning chamber is communicated with the flat flame burning chamber; the air burning mixing head comprises a primary air passage, and a secondary air cyclone multi-groove passage; one end of the primary air passage is communicated with the burning chamber, and the other end of the primary air passage is communicated with the burner casing; the secondary air cyclone multi-groove passage is sheathed on the surface of the air burning mixing head; air grooves are uniformly arranged on the outer edges of the two ends of the secondary air cyclone multi-groove passage in a spiral way; one end of each air groove is communicated with the burner casing, and the other end of each air groove is communicated with the flat flame burning chamber; the flat flame burning chamber is of a horn-shaped spiral structure. The low-NOx flat flame heat storage type burner has the advantages that the emission of NOx is effectively reduced, and the shape of the flat flame burner is not changed.

Description

technical field [0001] The invention relates to the field of burners, in particular to a low NOx flat-flame regenerative burner with staged combustion technology. Background technique [0002] Industrial furnaces, when heating metal billets, will generate a large amount of flue gas, and the flue gas discharge will take away a lot of high-temperature heat, resulting in waste of heat, making the heat utilization rate of energy generation low, and high-temperature flue gas emissions It will also pollute the environment. [0003] Industrial furnaces are high-energy-consuming furnaces that consume a huge amount of gas. Since large billets cannot be formed at one time during rolling or forging, they must be forged multiple times to form them. Therefore, there are high requirements for rapid heating of metal billets. At the same time, large The billet is expensive, and the economic loss caused by over-burning and excessive oxidation and burning should be avoided during the heating...

AI Technical Summary

Problems solved by technology

[0005] However, since the regenerator heats the combustion-supporting air or gas to a high temperature, and as the preheating temperature of the combustion-supporting air or gas rises sharply, the flame combustion temperature will also increase, causing the NOx produced during the combustion process to rise exponentially. It intensifies the pollution to the atmospheric environment, and the flat flame burner has extremely strict requirements on the shape of the flame in order to avoid oxidation and burning during the use of industrial furnaces. The conventional air or gas staged combustion technology will destroy the integrity of the flame. Not only can’t achieve the effect of reducing NOx emissions, but can’t form a flat flame, causing unnecessary losses in the production process

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