Cyclone burner for high-temperature air burning industrial furnace

A technology for high-temperature air and industrial furnaces, applied in gas fuel burners, burners, combustion methods, etc., can solve the problem of low gas temperature distribution in the furnace and achieve low local high temperature, lower emissions, and uniform temperature distribution Effect

Inactive Publication Date: 2010-10-06
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a concentric axial swirl burner for industrial furnace high-temperature air combustion technology, so as to solve the problem that the straight jet flow in the prior art is difficult to make the gas in the furnace more fully mixed and the temperature distribution better. Uniform, NO X Lower generated puzzles

Method used

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  • Cyclone burner for high-temperature air burning industrial furnace
  • Cyclone burner for high-temperature air burning industrial furnace
  • Cyclone burner for high-temperature air burning industrial furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The concentric axial swirling burner is composed of a central circular straight-through pipe 1, an outer casing 2, a rotating channel 3, and spiral fins 4. The central circular straight-through pipe 1 is located coaxially inside the outer casing 2. The rotation angle of the high-temperature air inlet and outlet of the rotating channel 3 varies from 0 degrees to 360 degrees. The rotating channel 3 consists of three spiral fins 4 axially according to the spiral angle of 0° to 360° and the dimensionless spiral extension length R=2 (R=l / h, l is the axial length of the spiral fins, h is The height of the spiral fin) is rotated and arranged between the central circular straight-through pipe 1 and the outer casing 2.

[0022] Under the following conditions: the fuel is city natural gas, the fuel gas jet velocity of the central circular tube is 29.5m / s; the jet velocity of the air rotating channel is 35.6m / s. The preheated air is 1273K, the excess air coefficient is 1.2, the o...

Embodiment 2

[0028] On the basis of Embodiment 1, when the swirl angle of the air swirling channel is θ=180°, the inlet parameters are respectively: the fuel is urban natural gas, the fuel gas jet velocity of the central circular tube is 29.5m / s; the jet velocity of the air swirling channel is 35.6m / s. The preheated air is 1273K, the excess air coefficient is 1.2, the oxygen concentration in the air is 8%, the heat dissipation at the bottom of the furnace is a constant heat flux density, and the size is 28580W / m 2 , the speed ratio of fuel and air is a=1.09. The distribution results of the nitrogen oxide emission concentration at the outlet of the burner with the spiral extension factor obtained by numerical calculation, such as Figure 5 shown.

Embodiment 3

[0030] On the basis of Embodiments 1 and 2, keep the helix angle of the burner fins at θ=180°, the stretching length factor of the fins R=2, and the inlet parameters are respectively: the fuel is urban natural gas, and the fuel gas jet flow of the central circular tube The velocity is 29.5m / s; the jet velocity of the air rotating channel is 35.6m / s. The preheated air is 1273K, the excess air coefficient is 1.2, the oxygen concentration in the air is 8%, the heat dissipation at the bottom of the furnace is a constant heat flux density, and the size is 28580W / m 2 . The distribution results of the nitrogen oxide emission concentration at the outlet of the burner with the velocity ratio of fuel and air obtained by numerical calculation, such as Figure 6 shown.

[0031] It can be seen from the comparison that the NOX emission of the swirl burner is lower than that of the once-through burner under the same conditions.

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Abstract

The invention relates to a concentric axial cyclone burner of an industrial furnace high-temperature air burning technique. The concentric axial cyclone burner consists of a central round straight-through pipe (1), an outer layer casing pipe (2), a rotary channel (3) and a helical fin (4), wherein the central round straight-through pipe (1) is positioned at a coaxial position in the outer layer casing pipe (2). The concentric axial cyclone burner can strengthen the intensive mixing of a gas fuel and high-temperature air in a hearth of the industrial furnace so as to ensure that stable burning is realized at a lower inlet air oxygen concentration, the temperature distribution in the hearth is more uniform, the local temperature is reduced, and simultaneously the discharge of nitrogen oxides (NOX) is greatly reduced to fulfill the aims of energy saving and environmental protection.

Description

technical field [0001] The invention belongs to the field of burner nozzles for industrial furnaces, in particular to a concentric axial swirl burner for regenerative (high temperature air combustion technology) industrial furnaces. Background technique [0002] Industrial furnaces are widely used in steel, metallurgy, machinery, ceramics, glass and other industries, and are key equipment for thermal processing. In industrial furnaces for heat treatment and various thermal processing processes, more and more gas combustion is used as a technical way of heating. High temperature air combustion (High temperature air combustion, HTAC) is an advanced combustion technology that uses high preheated air under ultra-low oxygen concentration conditions. It uses natural gas or coal gas as fuel and sends it into an industrial furnace for combustion in the form of a jet. And by using high-efficiency heat storage ceramic materials to limit the recovery of waste heat in the flue gas afte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23D14/00F23D14/70
Inventor 苏亚欣邓文义汪文辉
Owner DONGHUA UNIV
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