Low-nitrogen gas burner with adjustable and self-circulation exhaust gas in furnace

Abstract

The invention relates to a low-nitrogen gas burner with an adjustable and self-circulation exhaust gas in a furnace. The low-nitrogen gas burner with the adjustable and self-circulation exhaust gas inthe furnace comprises a combustion cylinder with an axial air inlet, a radial gas inlet and an axial outlet, wherein a gas pipe connected with the radial gas inlet is coaxially arranged in the combustion cylinder; an ignition device and a flame stabilizing plate are arranged on the axial outlet; the combustion cylinder comprises a first cylinder body and a second cylinder body sequentially connected along the gas axial conveying direction; multiple reflowing holes are formed in the second cylinder body; a gas reflowing amount adjusting structure for adjusting the sizes of the reflowing holesis correspondingly arranged in the combustion cylinder; an air guiding plate coaxially sleeves at a position, close to the reflowing holes, on the gas pipe; the air guiding plate extends toward the gas axial output direction so as to form a hollow-shaped circular truncated cone periphery wall with a gradually increased opening; an air guiding channel is formed between the hollow-shaped circular truncated cone periphery wall and the second cylinder body; and the sectional dimension of the air guiding channel along the gas axial conveying direction is gradually reduced. According to the structure, the aims of self circulation and secondary combustion of gas are achieved through a negative pressure difference, and low-nitrogen emission is realized.

Description

technical field [0001] The invention relates to the technical field of burner manufacture, in particular to a self-circulating low-nitrogen gas burner with adjustable flue gas in a furnace. Background technique [0002] Environmental problems, especially air pollution caused by NOx emissions from industrial boilers, have seriously affected people's lives and health. NOx emissions lead to the formation of acid rain and the generation of smog in the air, which have been paid more and more attention by the government and the people. In the field of industrial boilers and power plant boilers, the country has issued strict emission standards and regulations. The NOx emissions of existing burners are generally low nitrogen level (below 80mg / m³), and the current technology can reach ultra-low nitrogen level (below 30mg / m³). Even if the FGR technology is applied, it is unstable in daily operation, mainly because the three-gas ratio is difficult to control. [0003] Commonly used ...

AI Technical Summary

Problems solved by technology

However, the traditional flue gas recirculation needs to use the return fan to extract the flue gas and send it back to the burner, that is, it needs to re-lay the circulating flue gas pipeline and control system, which takes up a lot of space, high investment, and power loss of 20-30%.

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