CN216644209U

CN216644209U - Direct-fired burner for combustion chamber of shaft furnace

Info

Publication number: CN216644209U
Application number: CN202122714769.8U
Authority: CN
Inventors: 王艳丽; 安海涛
Original assignee: Jilin Xinda Iron and Steel Co Ltd
Current assignee: Jilin Xinda Iron and Steel Co Ltd
Priority date: 2021-11-08
Filing date: 2021-11-08
Publication date: 2022-05-31
Anticipated expiration: 2031-11-08

Abstract

A direct-fired burner for a combustion chamber of a shaft furnace comprises a combustion-supporting air chamber, a gas connecting pipeline, peepholes, a flange plate of the gas connecting pipeline, a flange plate of the combustion-supporting air chamber, a gas buffer chamber and a circular seam; the utility model is provided with the gas buffer chamber, high-pressure gas is input from a gas pipeline and then decompressed in the gas buffer chamber, meanwhile, the right end of the gas buffer chamber is matched with the right end of the combustion-supporting air chamber to form a rectangular annular seam, the gas and the combustion-supporting air are mixed at the annular seam, and the arrangement of the rectangular annular seam and the gas buffer chamber reduces the gas pressure, can ensure that the gas and the combustion-supporting air are fully mixed, has high combustion speed and short generated flame, simultaneously reduces the blockage of a burner, improves the combustion stability, finally obtains the maximum total heat, and also prolongs the service life of the shaft furnace.

Description

Direct-fired burner for combustion chamber of shaft furnace

Technical Field

The utility model relates to the technical field of metallurgy, in particular to a direct-fired burner for a combustion chamber of a shaft furnace.

Background

In iron and steel production enterprises, a shaft furnace is used for sintering pellet ore materials, a burner is arranged on a combustion chamber of the shaft furnace, and coal gas and air are mixed by the burner and then are sprayed and combusted; the existing shaft furnace combustion chamber uses a circumferential seam vortex burner, and has the following defects: firstly, combustion-supporting air is sprayed out in a vortex shape during use to form local strong backflow, fine ash in blast furnace gas is blocked at a nozzle outlet to cause nozzle blockage, and normal conveying of the gas and the combustion-supporting air in a combustion chamber is restricted; secondly, in the mixing process of the flame-retardant air and the coal gas, the flow velocity is too high due to strong rotational vortex, so that the combustion stability is poor, the ignition is difficult due to extremely high air flow pressure, and the fire extinguishing phenomenon of a combustion chamber is easy to occur in the re-air process; thirdly, limited by a circular seam structure, the air quantity of combustion-supporting air is still insufficient even in a full-air full-load state, the oxygen content at the outlet of a combustion chamber is low, and the oxidizability in the furnace is poor; fourthly, the high pressure air flow causes the combustion flame to be too long, which easily causes the combustion chamber, the mixed brick structure and the furnace shell to be burnt through. Therefore, there is a need for a direct-fired burner for a combustion chamber of a shaft furnace, which solves the above four problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a direct-fired burner for a combustion chamber of a shaft furnace, which is not easy to block, can ensure that flame retardant air and coal gas are fully mixed in the mixing process of the burner, can ensure high combustion speed and short generated flame, finally obtains the maximum total heat and prolongs the service life of the shaft furnace.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a direct-fired burner for a combustion chamber of a shaft furnace comprises a combustion-supporting air chamber, a gas connecting pipeline, peepholes, a flange plate of the gas connecting pipeline, a flange plate of the combustion-supporting air chamber, a gas buffer chamber and a circular seam; the right end of the combustion-supporting air chamber is provided with a flange, the lower end of the combustion-supporting air chamber is closed into a circle and is fixed with a combustion-supporting air chamber flange; the gas connecting pipeline is tubular with a rectangular horizontal section, the lower end of the gas connecting pipeline is closed up to be round, and a gas connecting pipeline flange plate is fixed on the gas connecting pipeline; the right side of the gas connecting pipeline is fixed with the gas buffer chamber; the right opening of the gas connecting pipeline is communicated with the gas buffer chamber; the coal gas buffer chamber is fixed with the combustion-supporting air chamber; the coal gas buffer chamber is arranged in an inner cavity of the combustion-supporting air chamber; the vertical sections of the right ends of the gas buffer chamber and the combustion-supporting air chamber are rectangular; the right ends of the gas buffer chamber and the combustion-supporting air chamber form a rectangular annular seam with uniform gaps on the periphery.

The direct-fired burner for the combustion chamber of the shaft furnace is also provided with a peephole, the peephole is fixed on the left side of the gas connecting pipeline through a fastening piece, and the installation position is positioned at the central position of the gas buffer chamber.

The direct-fired burner for the combustion chamber of the shaft furnace is characterized in that a gas pipeline is connected below the flange plate of the gas connecting pipeline; and a combustion-supporting air pipeline is connected below the combustion-supporting air chamber flange.

Advantageous effects

The utility model has the following advantages:

the direct-fired burner for the combustion chamber of the shaft furnace is provided with the gas buffer chamber, high-pressure gas is input from a gas pipeline and then is decompressed in the gas buffer chamber, meanwhile, the right end of the gas buffer chamber is matched with the right end of the combustion-supporting air chamber to form a rectangular annular seam, the gas and the combustion-supporting air are mixed at the annular seam, and the rectangular annular seam and the gas buffer chamber are arranged, so that the gas pressure is reduced, the gas and the combustion-supporting air can be fully mixed, the combustion speed is high, the generated flame is short, the burner blockage is reduced, the combustion stability is improved, the maximum total heat is finally obtained, and the service life of the shaft furnace is prolonged.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention;

FIG. 2 is a left side view of the present invention;

in the drawings, the reference numerals denote: 1. the shaft furnace comprises a combustion chamber of the shaft furnace, 2, a combustion-supporting air chamber, 3, a gas connecting pipeline, 4, a peephole, 5, a flange plate of the gas connecting pipeline, 6, a flange plate of the combustion-supporting air chamber, 7, a gas buffer chamber, 8 and a circular seam.

Detailed Description

The utility model is further illustrated by the following figures and examples.

The direct-fired burner for the combustion chamber of the shaft furnace comprises a combustion-supporting air chamber 2, a gas connecting pipeline 3, a peephole 4, a flange plate 5 of the gas connecting pipeline, a flange plate 6 of the combustion-supporting air chamber, a gas buffer chamber 7 and a circular seam 8; the gas buffer chamber 7 is a pipeline with a rectangular vertical section, the left end of the gas buffer chamber is connected with the gas connecting pipeline 3, and the right end of the gas buffer chamber and the combustion-supporting air chamber 2 form a rectangular annular seam 8; a flange is arranged at the right end of the combustion-supporting air chamber, a round hole is arranged on the flange, and the burner is fastened on the side surface of the combustion chamber 1 of the shaft furnace through a fastener;

according to the direct-fired burner for the combustion chamber of the shaft furnace, coal gas is input into the coal gas connecting pipeline 3 through the coal gas pipeline and then enters the coal gas buffer chamber 7, and the pressure of the coal gas is reduced; combustion-supporting air is input into the combustion-supporting air chamber 2 through a pipeline; the coal gas and the combustion-supporting air are mixed at the circumferential seam, and finally the mixed gas enters a combustion chamber of the shaft furnace for combustion.

The direct-fired burner for the combustion chamber of the shaft furnace is also provided with a peephole 4 for observing the combustion condition inside.

Claims

1. A direct-fired burner for a combustion chamber of a shaft furnace is characterized in that: the direct-fired burner for the combustion chamber of the shaft furnace comprises a combustion-supporting air chamber (2), a gas connecting pipeline (3), a peephole (4), a gas connecting pipeline flange plate (5), a combustion-supporting air chamber flange plate (6), a gas buffer chamber (7) and a circular seam (8); the right end of the combustion-supporting air chamber is provided with a flange, the lower end of the combustion-supporting air chamber is closed into a circle and is fixed with a combustion-supporting air chamber flange; the gas connecting pipeline is tubular with a rectangular horizontal section, the lower end of the gas connecting pipeline is closed to be round, and a gas connecting pipeline flange plate is fixed on the gas connecting pipeline; the right side of the gas connecting pipeline is fixed with the gas buffer chamber; the right opening of the gas connecting pipeline is communicated with the gas buffer chamber; the coal gas buffer chamber and the combustion-supporting air chamber are fixed together; the coal gas buffer chamber is arranged in an inner cavity of the combustion-supporting air chamber; the vertical sections of the right ends of the gas buffer chamber and the combustion-supporting air chamber are rectangular; the right ends of the gas buffer chamber and the combustion-supporting air chamber form a rectangular annular seam (8) with uniform gaps on the periphery.

2. A direct combustion burner for a combustion chamber of a shaft furnace according to claim 1, wherein: the direct-fired burner for the combustion chamber of the shaft furnace is also provided with a peephole (4), the peephole is fixed on the left side of the gas connecting pipeline (3) through a fastener, and the installation position is positioned at the central position of the gas buffer chamber (7).

3. A direct combustion burner for a combustion chamber of a shaft furnace according to claim 2, wherein: a gas pipeline is connected below the flange plate (5) of the gas connecting pipeline; and a combustion-supporting air pipeline is connected below the combustion-supporting air chamber flange plate (6).