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Natural gas premix combustor with combustion stabilization device formed by row of oval tubes

A stable combustion device and premixed combustion technology, which is applied to gas fuel burners, burners, combustion methods, etc., can solve the problems of poor flame stability, deflagration and blowout, and easy tempering of natural gas premixed combustion, and achieve Good application prospects, enhanced stability, and low burner resistance

Inactive Publication Date: 2018-08-10
HIT HARBIN INST OF TECH KINT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a natural gas premix burner with an elliptical tube row stabilizing device to solve the problems of poor flame stability of natural gas premix combustion and easy occurrence of flashback, deflagration and blowout

Method used

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  • Natural gas premix combustor with combustion stabilization device formed by row of oval tubes
  • Natural gas premix combustor with combustion stabilization device formed by row of oval tubes
  • Natural gas premix combustor with combustion stabilization device formed by row of oval tubes

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specific Embodiment approach 1

[0010] Specific implementation mode one: the following combination Figure 1 to Figure 4 This embodiment will be specifically described. This embodiment includes a premixed natural gas pipeline 1, a gradually expanding connecting pipeline 2, a nozzle pipe row 3, a cooling medium inlet header 4, a cooling medium outlet header 5, and a combustion stabilization device 6. The nozzle pipe row 3 consists of N parallel It is composed of vertically arranged square tubes in a row. The lower end of the square tubes communicates with the cooling medium inlet header 4, and the upper end of the square tubes communicates with the cooling medium outlet header 5. The nozzle tube row 3 is arranged in the expanding connecting pipe 2 On the air outlet port, N square tubes form N-1 slit nozzles. According to the burner power selection N is 5-40; the side length of the outer wall of the square tube is 20-38mm; the nozzle row height is 300-1500mm; the width b of the slit nozzle is 1.0-2.0mm; The ...

specific Embodiment approach 2

[0013] Specific implementation mode two: the following combination Figure 5 This embodiment will be specifically described. The difference between this embodiment and Embodiment 1 is that a plurality of rectangular metal sheets 7 are welded in each slit nozzle of the nozzle tube row 3, the height g of the rectangular metal sheet 7 is 3-4mm, and the thickness is equal to that of the slit nozzle. Width, the width is equal to the depth of the slit nozzle. The rectangular metal sheets 7 are arranged at equal intervals in the height direction of the slit nozzle. The rectangular metal sheet 7 divides the slit nozzle formed by the nozzle tube row into a plurality of rectangular nozzles, and the height f of the rectangular nozzles is 20-40mm.

[0014] The slit nozzle is divided into multiple rectangular nozzles, which reduces the aspect ratio of the premixed natural gas jet, improves the rigidity of the jet, improves the uniformity of the air velocity distribution of the slit nozzl...

specific Embodiment approach 3

[0015] Specific embodiment three: the difference between this embodiment and embodiment one is that it also includes annular ribs 16, and a plurality of annular ribs 16 are arranged on the outer surface of each oval tube of the flame stabilization device 6, and a plurality of annular ribs 16 Arrange evenly along the height direction of the oval tube, and the spacing is 20-50mm. The fin height of the annular rib 16 is 2-3mm, and the fin thickness is 2-3mm. The flame scours the annular rib 16, and the annular rib can strengthen the heat exchange of the oval tube and reduce the temperature of the flame. At the same time, due to the gas viscous force, a flow boundary layer is formed near the wall of the annular rib, and the air velocity is low, which is beneficial to stable combustion.

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Abstract

The invention discloses a natural gas premix combustor with a combustion stabilization device formed by a row of oval tubes, relates to a natural gas combustor, and particularly relates to the naturalgas premix combustor. The natural gas premix combustor solves the problems that the stability of flame is poor and tempering, detonation and blow-out occur easily in the premixed combustion process of the natural gas. The natural gas premix combustor comprises a premixed natural gas pipeline, a diverging connecting pipeline, a nozzle tube row, a cooling medium inlet header and a cooling medium outlet header, wherein the nozzle tube row is composed of N square tubes or N round tubes with parallel side ribs, and the N square tubes or the N round tubes are vertically arranged in parallel to forma row; the nozzle tube row is distributed in a row on an air outlet of the diverging connecting pipeline, and the N square tubes or the side ribs of the N round tubes form N minus one slit nozzles; and the natural gas premix combustor further comprises the combustion stabilization device, the combustion stabilization device is composed of the N minus one oval tubes which are arranged vertically in parallel and arranged in a low, each of the oval tubes of the combustion stabilization device forms a slit nozzle corresponding to the nozzle tube row, and the extension lines of the oval tubes in the long axis direction coincide with the center lines of the slit nozzles in the width direction.

Description

technical field [0001] The invention relates to a natural gas burner, in particular to a natural gas premixed burner. Background technique [0002] Natural gas has low sulfur content, high calorific value, and high thermal efficiency. It is recognized as an economical and environmentally friendly primary energy source in the world. Nevertheless, the nitrogen oxides produced by the combustion of natural gas are one of the main pollutants in the atmosphere, which can form acid rain and smog, endangering human health and the environment. In recent years, the country has issued a series of laws and regulations and mandatory standards to limit the emission of nitrogen oxides. The "Emission Standard of Air Pollutants for Thermal Power Plants" (GB 13223-2011) sets a limit of 100 mg / m for the emission of nitrogen oxides from gas-fired boilers 3 On May 13, 2015, Beijing issued the "Boiler Air Pollutant Emission Standard" (DB11 / 139-2015), which stipulates that from April 1, 2017, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23D14/02F23D14/58F23D14/70F23D14/82
CPCF23D14/02F23D14/58F23D14/70F23D14/82
Inventor 刘辉李金峰佟博儒李伟康丰
Owner HIT HARBIN INST OF TECH KINT TECH
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