JPS636308A - Burner for furnace of sintering and ignition - Google Patents

Abstract

PURPOSE:To enable uniform ignition to be performed in a width direction of a machine by a method wherein a set of fuel headers are arranged with being crossed at a right angle in the advancing direction of a pallet, a first air header is arranged between the fuel headers, a second air header is arranged outside the fuel headers and then air from the air headers is injected against the injected fuel. CONSTITUTION:A set of fuel headers 11 and 12 are arranged in the advancing direction of a pallet by being crossed at a right angle, a first air header 20 is arranged between the fuel headers 11 and 12, and second air headers 21 and 22 are arranged outside the fuel headers. When equal amount of air for combustion is fed from the first air header 20 and second air headers 21 and 22, fuel gas from fuel injection ports 11a and 12 a advances directly toward a surface of raw material to get two parallel flames. By varying a feeding rate, a shape of each of the flames can be controlled. In this case, since combustion air strikes against each other from both sides with fuel gas left therebetween, a rapid combustion can be performed and the unburnt component can be completely burnt. In this way, an ignition which is uniform in a lateral direction can be carried out and an efficient countermeasure can be taken for a variation in nature of raw material and variation various dimensions of production by varying the shape of and the height of each of the flames in the burner.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a burner for a sinter ignition furnace.

[Prior Art] A sintering raw material containing coke breeze fed from a raw material feeder onto a master floor is first ignited in an ignition furnace. As shown in Fig. 2, the conventional ignition furnace 1 has a plurality of burner rows arranged in the width direction of the furnace at appropriate pitches, e.g., 3 to 4 burners per 1 meter. The configuration is as follows.

[Problems to be Solved by the Invention] However, in the above-mentioned ignition furnace, since the burners 2 are arranged at intervals in the machine width direction, there is a problem that ignition unevenness occurs in the machine width direction. In addition, since burner 2 is fixed to the ceiling (1a), the flame temperature pattern is fixed when the same amount of fuel is used for combustion, so the fuel input may vary depending on changes in production specifications such as layer thickness and pallet speed. As the ignition strength increases or decreases, it is necessary to completely change the ignition strength, which creates the problem of wasted fuel.

The object of the present invention is to provide a burner for an ignition furnace that can solve the above-mentioned problems.

[Means for Solving Problems] The burner for a charcoal ignition furnace of the present invention includes a set of fuel headers disposed orthogonally to the traveling direction of the pallet, and a set of fuel headers arranged between the set of fuel headers. a first air header provided with said first air header;
and a second air header provided on the outside of each of the fuel headers of the set, respectively. 1 above for the second air header
Ejection holes are provided to eject air toward the fuel ejected from the fuel headers of the ffis.

Since the fuel and combustion air are ejected from the headers provided in the width direction of the aircraft, uniform ignition can be achieved in the forward direction of the aircraft. Each set of fuel headers has a first.
It is disposed between the second air headers, and the combustion air collides with both sides of the injected fuel to mix it, so that rapid combustion with good mixing properties is possible. Also number 1. By changing the input ratio of air input from the second air header, 1
By changing the orientation of the frames from a set of fuel headers, two frames can be narrowed down to one, or expanded over a wide range to efficiently respond to changes in raw material properties and production specifications.

[Implementation]] An embodiment of the present invention will be explained with reference to FIG. A set of fuel headers 11,12 is fed through distribution holes JJd so as to be sprayed uniformly in the direction of travel of the pallet. The fuel gas flows through a large number of nozzles J evenly distributed in the width direction of the burner body JO.
It is ejected from lh toward the raw material layer. The fuel header 12 also has the same configuration as the spatula/11. The ejection holes 12h are provided in a staggered manner with respect to the ejection holes 11m in order to further improve the uniformity of ignition in the machine width direction.

A first air header 20 is provided between the fuel headers 11,12. The air header 20 is provided on the lower surface of the main body 10, and combustion air is supplied from a wind box connected to a wind pipe through a distribution hole 20d.

The lower surface of the air header 20 has fuel injection holes 11&.

J.? A large number of injection holes 20h and 20b are provided to inject combustion air obliquely downward toward the fuel ejected from the fuel injection hole 20a. A second air header 31.22 is also provided outside the fuel header 11.12, and includes distribution holes 21d and 22r from the wind box.
Combustion air is fed in via l. Second air header 21
A jet hole 211 is provided at a position symmetrical to the jet hole 20h of the first air header, and a second jet hole 211 is provided below the jet hole 211.
1b is open. The ejection holes 21& are opened in a staggered manner with respect to the ejection holes 20h. Further, the second air header 22 also has the same configuration as the air header 21 described above.

The first air header 20 and the second air header 21 .
When uniform combustion air is supplied from 22, the fuel gas from the fuel injection holes 11a and 12m travels straight toward the raw material surface, resulting in two parallel frames. - direction 2nd air header 21, 22 to 8g1 air header 20, when too much air is supplied, the ejection holes Jlh, 12h
The flame from this can be narrowed down to the center of the burner to obtain a high-temperature concentrated flame. Conversely, the first air header 2
When a large amount of air is supplied from 0, the frame expands toward the end and a broadband frame can be obtained. In this way, the frame shape can be controlled by changing the proportion of combustion air fed to the first air header and the second air header. In these cases, combustion air collides from both sides with the fuel gas sandwiched between them, so mixing of the fuel and combustion air is promoted and rapid combustion becomes possible. Also, like this example,
A second blowout hole 21b in the second air header 21.22.

If 22b is left open, the frame will be surrounded by an air curtain of air from these nozzles, allowing unburned matter to be completely combusted.

For example, in a sintering machine with an amplitude of 5 m, the length is 1 m.
The burner is constructed by arranging five burner units in the furnace width direction. In addition, an expansion part 'e[ff] is placed in the vertical part of the fuel gas supply pipe and the combustion air pipe, and
y2 Provided so that it can be raised and lowered.

One or more rows of two-flame burners having the above configuration are provided in the traveling direction of the Tsukret, and burners are adjusted in response to fluctuations in raw material properties, such as raw material temperature, moisture, and amount of coke breeze, as well as production specifications, such as layer thickness and conveyance speed. By fully controlling the frame shape, burner combustion load, and burner height, these variations can be efficiently dealt with.

In this way, the ignition furnace basic unit C gas 1.8 to 1.9 Nn'/
The amount of sintered tons can be reduced by about 3 (l).This allows a sintering machine with a production capacity of 850 tons per hour to save about 7 million yen per month in fuel costs.

[Effect of the invention] The burner for a sintered ignition furnace of this invention is as described above,
Uniform ignition across the width of the aircraft is possible. Rapid combustion can be achieved by impingement mixing of fuel and combustion air. Further, by providing one or more rows of the two-flame burners of the present invention in an ignition furnace and changing the burner frame shape, height, etc., changes in raw material properties and production specifications can be efficiently dealt with.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG.
) and (b) are sectional views in the longitudinal direction and the width direction showing the arrangement Ut of a conventional ignition furnace burner. 10...Burner body, 11.12...Fuel header,
JJa, 22m...Fuel injection hole, 20...First air header, 20a, 20b...Air injection hole,
21.22...Second air header, 21h, 22m...
・Air vent. Figure 1 (a) (b) Figure 2

Claims (1)

[Claims] A set of fuel headers arranged perpendicular to the traveling direction of the pallet, a first air header provided between the set of fuel headers, and a first air header provided outside the set of fuel headers. and a second air header, wherein the first and second air headers are provided with ejection holes for ejecting air toward the fuel ejected from the pair of fuel headers, respectively. Burner for sintering ignition furnace.