KR100894039B1 - Burner for sintering - Google Patents

Abstract

A burner for sintering is provided to ignite mixing material for sintering completely by enlarging a flame injection area to enlarge a contact area between flame and a conveying path. A burner for sintering comprises: a first nozzle pipe and a second nozzle pipe spraying fuel; a first duct discharging combustion air; a central injection nozzle(230) jetting the combustion air between a pair of nozzle pipes; a side injection nozzle jetting the combustion air between the inner surfaces of the first duct and a pair of nozzle pipes; a second duct(310) supplying the air for flame adjustment to the first duct; and an air curtain injection nozzle(330) spraying the air for the flame adjustment so that the air for flame adjustment forms the air curtain.

Description

Sintering Burner {BURNER FOR SINTERING}

The present invention relates to a sintering burner, and more particularly, to an sintering burner capable of complete sintering by expanding a contact area between a flame and a conveying path for transporting a flame and a blended raw material for sintering. .

In general, the sintering process is a process of solidifying a powder compacted under pressure into a suitable shape while heating. In the steelmaking process, various subsidiary materials for improving the fusion formation of fine iron ore and cokes, which are fuels, are mixed. By sintering to produce a sintered ore mainly composed of molten bonding of iron ore.

That is, the sintering process is a process of sintering ore by sintering the iron ore into the blast furnace and heating the sintering compound consisting of the crushed iron ore and the various auxiliary materials and coke using a sintering burner, through the sintering process, Iron, the result of the iron making process, should contain various mineral phases and pores that affect its properties.

However, when the sintering compounding material is incompletely burned in the sintering process, the sintered ore is not properly formed from the sintering compounding material, and thus various mineral phases and pores are not included. This problem also causes a problem of significantly lowering the quality of iron, which is the result of the steelmaking process.

Therefore, the present invention was devised to overcome the above-described problems, and by expanding the flame spraying section, the contact area between the flame and the conveying path for transporting the blending raw material for sintering is expanded to completely burn the blending raw material for sintering. It is an object to provide a burner for sintering.

One embodiment of the sintering burner according to the present invention for achieving the technical problem as described above, the head and the one side of the head is formed in the same length as the width of the conveying path of the raw material for sintering compound and curved toward the conveying path And a first nozzle row and a second nozzle row provided on the other side to inject fuel, the first nozzle pipe injecting fuel through a plurality of injection nozzles provided in the first nozzle row and the second nozzle row, and extending in parallel thereto. A first duct in communication with a second nozzle pipe disposed below the nozzle tube disposed inside and communicating with a combustion air supply pipe supplying combustion air, and discharging the combustion air from an upper side to a lower side; A central injection nozzle provided at a lower side and injecting the combustion air between the pair of nozzle tubes, and provided at a lower side of the first duct and a lower side of the pair of nozzle tubes and the first duct. Side injection nozzles for injecting the combustion air between the upper surface, a second duct provided outside the first duct to supply flame control air from the upper side to the lower side, and the second air so that the flame control air forms an air curtain It is provided on the lower side of the duct characterized in that it comprises an air curtain injection nozzle for injecting the air for flame control.

In addition, in one embodiment of the sintering burner according to the present invention, the central injection nozzle and the side injection nozzle is provided in a slit shape having the same length as the length of the first nozzle pipe and the second nozzle pipe, the central injection nozzle The slit width ratio of the side injection nozzles provided on one side of the nozzle to the side injection nozzles provided on the other side of the central injection nozzles is 3 to 4 to 3 so as to be provided in the pair of nozzle tubes. The fuel injected through the injection nozzle and the combustion air injected from the central injection nozzle and the side injection nozzle is characterized in that the mixture is well mixed.

One embodiment of the sintering burner according to the present invention, by burning the fuel injected through the injection nozzles provided in the pair of nozzle pipes using the combustion air injected from the central injection nozzle and the side injection nozzle. Generating a flame, and adjusting the area of contact between the generated flame and the transfer path and the radiation width of the flame by using the air curtain formed by the air curtain injection nozzle.

According to the sintering burner according to the present invention having the configuration as described above, the flame spray section is enlarged, the contact area between the flame and the conveying path for conveying the sintering compound material is widened, and the sintering compound material is completely burned. There is an advantage.

Hereinafter, with reference to the accompanying drawings, it will be described in detail an embodiment according to the present invention.

In this process, the size or shape of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms that are specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user or operator. Definitions of these terms should be made based on the contents throughout the specification.

1 is a perspective view of a sintering burner according to the present invention, FIG. 2 is a side cross-sectional view of the sintering burner according to the present invention, FIG. 3 is a plan view of the sintering burner according to the present invention, and FIG. 5 is a cross-sectional view of a nozzle tube of a sintering burner according to the present invention.

1 to 5, the sintering burner 10 according to the present invention includes a fuel injection unit 100, a combustion air injection unit 200, and a flame control air injection unit 300. do.

The fuel injection unit 100 injects fuel to generate a flame toward the conveying path P of the sintering compound material, and the fuel supplied from the fuel supply pipe 110 for supplying fuel and the fuel supply pipe 110. It is provided with a pair of nozzle pipe 120 for spraying.

In this case, the fuel supply pipe 110 is disposed through the first duct 210 to be described later, the upper end is provided with a flange portion to be coupled to the pipe (not shown) connected to the fuel tank (not shown), the lower end It is coupled to the nozzle pipe 120 to be described later.

The fuel supply pipe 110 is coupled to one end of the nozzle pipe 120 to be described later to supply fuel, but the amount of fuel injected from the injection nozzles 125 and 127 provided in the nozzle pipe 120 to be described later is the fuel supply pipe. As the side end closer to 110 becomes larger, the amount of fuel injected for each injection nozzle 125 and 127 is not the same. Therefore, in order to equalize the amount of fuel injected, the fuel supply pipe 110 is provided to be substantially perpendicular to the nozzle pipe 120 to be described later, and at regular intervals along the longitudinal direction of the nozzle pipe 120 to be described later. It is preferable to provide a large number.

In addition, the fuel supply pipe 110 may also supply fuel through a duct integrally formed as the combustion air injection unit 200 or the flame control air injection unit 300, which will be described later, but prevents excessive supply of fuel and generates a flame. In consideration of the stability problem, it is preferable to form a plurality of tubes.

In addition, the nozzle tube 120 is provided across the transfer path P, and when the width of the transfer path P is small, it may be formed to have a length substantially equal to the width of the transfer path P. have. On the other hand, when the width of the conveying path (P) is large, the sintering burner (10) according to the present invention is connected in parallel so that the sum of the lengths of the nozzle tubes (120) is substantially the width of the conveying path (P). Do the same.

The nozzle pipe 120 is provided with a pair of symmetrical with respect to the central injection nozzle 230 to be described later. In this case, each of the nozzle pipes 120 includes a head 122 curved toward the transfer path P, a first nozzle row 124 provided on one side of the head 122 to inject the fuel, and The second nozzle row 126 is provided on the other side of the head 122 to inject the fuel in a direction different from the first nozzle row 124.

Here, the head 122 is curved toward the transfer path P to be easily mixed with the combustion air injected from the combustion air injection unit 200 which will be described later, and heat is concentrated by the flame, thereby resisting heat. It is composed of heat resistant material.

In addition, the first nozzle row 124 and the second nozzle row 126 are symmetrical with respect to the head 122 and are provided in parallel along the longitudinal direction of the nozzle tube 120. (125, 127) are provided. In this case, the injection nozzle 125 provided in the first nozzle row 124 injects the fuel toward the side injection nozzle 240, which will be described later, and the injection nozzle 127 provided in the second nozzle row 126. ) Injects the fuel toward the central injection nozzle 230 to be described later. In addition, the injection nozzle 125 provided in the first nozzle row 124 and the injection nozzle 127 provided in the second nozzle row 126 are the nozzle pipe 120 based on the head 122. ) Is arranged in a zigzag shape in the longitudinal direction, so that the fuel is dispersed and injected.

In addition, the fuel injection angles α and β of the injection nozzle 125 provided in the first nozzle row 124 and the injection nozzle 127 provided in the second nozzle row 126 are the head 122. It is preferable that it is 45 degrees with respect to the center of. This is based on the following experimental results.

Experiment number Injection nozzle angle (°) Straightness of flame Flame stability α β One 30 30 usually Bad 2 30 45 usually good 3 45 30 good usually 4 45 45 Very good Very good 5 45 60 good usually 6 60 45 usually good 7 60 60 Bad usually

(At this time, in the experimental results, the straightness of the flame refers to the extent to which the flame does not spread and is generated in a straight line, and the stability of the flame refers to the extent to which the fuel and combustion air are completely burned.)

That is, when the injection angle α of the injection nozzle 125 provided in the first nozzle row 124 is increased (in the case of Experiments 1 to 3), the straightness of the flame is improved, but the safety of the flame is b. In contrast, when the injection angle β of the injection nozzle 127 provided in the second nozzle row 126 is increased (in the case of Experiments 5 to 7), the flame stability is improved on the contrary. Gets worse

In addition, the diameters of the injection nozzles 125 provided in the first nozzle row 124 and the injection nozzles 127 provided in the second nozzle row 126 are the central injection nozzles 230 and the side injection nozzles, which will be described later. Each may vary depending on the size of the 240. That is, when the size of the central injection nozzle 230 to be described later is larger than the size of the side injection nozzle 240 to be described later, the injection is provided in the second nozzle row 126 to match the fuel ratio to the combustion air ratio The nozzle 127 should be larger than the injection nozzle 125 provided in the first nozzle row 124.

Meanwhile, the combustion air injection unit 200 injects combustion air for burning the fuel injected from the fuel injection unit 100, and includes a first duct 210 and a first air supply pipe 220. And a central injection nozzle 230 and a side injection nozzle 240.

In this case, the fuel supply pipe 110 is penetrated through the upper side of the first duct 210, and the pair of nozzle pipes 120 are disposed below the inner side of the first duct 210, and the combustion air is supplied to the upper side thereof. The first air supply pipe 220 is provided. That is, the first duct 210 is formed to surround the fuel injection unit 100, and the combustion air may be injected in the direction in which fuel is injected from the fuel injection unit 100. Here, a flange portion is provided at an upper end of the first air supply pipe 220 so as to be coupled to a pipe (not shown) connected to a combustion air storage tank (not shown) having a high oxygen content. Duct 210 is coupled.

In addition, the central spray nozzle 230 is disposed between the pair of nozzle tubes 120 disposed below the first duct 210 such that the combustion air is injected between the pair of nozzle tubes 120. It is provided. At this time, the combustion air injected from the central injection nozzle 230 serves to combust the fuel injected from the fuel injection unit 100 and at the same time cools the overheated zone of the head 122. It also plays a role in prolonging the lifespan and reducing NOx.

In addition, the side injection nozzles 240 are disposed between the pair of nozzle tubes 120 and the inner surface of the first duct 210 so that the combustion air is injected around the pair of nozzle tubes 120. Is provided.

The central injection nozzle 230 and the side injection nozzle 240 is formed in a slit shape to be easily installed adjacent to the nozzle pipe 120, the length of the slit is substantially the length of the nozzle pipe 120 It is preferred that the same as.

That is, the central injection nozzle 230 and the side injection nozzle 240 are provided between and around the pair of nozzle pipes 120, so that the flame is well flamed from the fuel injected from the pair of nozzle pipes 120. To inject the combustion air to occur.

At this time, the amount of combustion air injected between and around the pair of nozzle tubes 120 is an important factor for determining the straightness and stability of the flame, and the central injection nozzle 230 and the side injection nozzle 240 By adjusting the size ratio, it is possible to control the amount of combustion air that is injected between and around the pair of nozzle tubes 120.

That is, the size (a) of the side injection nozzle 242 provided on one side of the central injection nozzle 230 versus the size (b) of the central injection nozzle 230 versus the other side of the central injection nozzle 230 By adjusting the ratio of the size (c) of the side injection nozzle 244 can be obtained a flame that satisfies both the straightness and stability, the experimental results are as follows.

Experiment number Nozzle Size Ratio of Combustion Air Injection Straightness of flame Flame stability a b c One 2 5 2 Bad Bad 2 3 4 3 Very good Very good 3 3 3 3 usually good 4 4 3 4 Bad usually 5 5 2 5 Bad Bad

As the experimental result shows, when the size (b) of the central injection nozzle 230 is much larger than the sizes (a, c) of the side injection nozzle 240 (in case of Experiment 1), the nozzle Since a lot of air is injected between the columns 120, the flame is not generated in a straight line, but is generated by splitting on both sides, so the straightness of the flame is bad, and the amount of combustion air is around the central spray nozzle 230. Many flame stability is also low.

On the other hand, when the size (b) of the central injection nozzle 230 is very smaller than the size (a, c) of the side injection nozzle 240 (in the case of experiment 3 or 4), the nozzle row 120 Since a lot of air is injected from the surroundings and a little air is injected between the nozzle rows 120, the flame does not descend into the transfer path P, so that the flame revolves around the nozzle rows 120. It is bad, and the amount of combustion air is small around the central spray nozzle 230, and the flame stability is also lowered.

Therefore, in view of the experimental results, the size (a) of the side injection nozzle 242 provided on one side of the central injection nozzle 230 versus the size (b) of the central injection nozzle 230 versus the central injection The ratio of the size c of the side injection nozzles 244 provided on the other side of the nozzle 230 is preferably 3 to 4 to 3.

On the other hand, the flame control air injection unit 300 is to control the contact area between the flame and the transfer path (P) by injecting the flame control air around the flame, the second duct 310 and the second air supply pipe 320 and an injection nozzle 330 for an air curtain.

In this case, the second duct 310 is provided on the outside of the first duct 210, the second air supply pipe 320 is provided on the upper side, the injection nozzle 330 for the air curtain is provided on the lower side It is provided. That is, the second duct 310 is formed so as to surround the first duct 210, so that the flame control air can be injected in the direction in which the flame occurs.

In addition, the second air supply pipe 320 is to supply the flame control air from the upper side to the lower side of the second duct 210, the upper end is connected to a flame control air storage tank (not shown) with less oxygen content The flange is provided to be coupled to the pipe (not shown), the second duct 310 is coupled to the lower end.

In addition, the air curtain injection nozzle 330 is to form an air curtain by injecting the flame control air, it is provided on the lower side of the second duct (310). At this time, the air curtain injection nozzle 330 is disposed below the nozzle pipe 120 to be located closer to the transfer path (P) than the nozzle pipe (120). By using the air curtain formed through the air curtain injection nozzle 330 by controlling the spread of the flame to the side, thereby controlling the contact area between the flame and the transfer path (P).

Hereinafter, with reference to Figure 6b will be described the operation of the sintering burner according to the present invention. At this time, Figure 6b is a cross-sectional view showing the degree of injection of the flame by the sintering burner according to the present invention.

As shown in Figure 6b, before transporting the sintering compounding material is installed a sintering burner 10 according to the present invention spaced apart from the conveying path (P) by a predetermined height (h), the fuel and combustion Spray the air.

At this time, the predetermined height (h) is adjusted in consideration of the type of fuel or the intensity of the flame, the sintering burner 10 according to the present invention can be completely sintered even without being damaged by heat It can be as high as possible. In particular, the injection angle of the injection nozzle 125 provided in the first nozzle row 124 and the injection nozzle 127 provided in the second nozzle row 126 is 45 ° based on the center of the head 122. Size (a) of the side injection nozzle 242 provided on one side of the central injection nozzle 230 versus the size (b) of the central injection nozzle 230 versus the other side of the central injection nozzle 230 When the ratio of the size c of the side injection nozzles 244 is 3 to 4 to 3, the predetermined height h is preferably 350 mm.

As described above, the fuel and the combustion air are injected, and the fuel is ignited using the ignition device 20 shown in FIG. 7B to generate a flame. At this time, it is not necessary to continue to ignite after igniting once.

After the flame is generated, an air curtain is formed using the flame control air injected from the flame control air injection unit 300, and the contact area between the flame and the transfer path P is formed using the air curtain. Adjust.

In this case, since the oxygen for the flame control air injected from the flame control air injection unit 300 includes a part of oxygen, forming the air curtain in consideration of the fact that some of the unburned fuel may be burned in the injected fuel. desirable.

As described above, after the flame is stably formed with constant straightness, the transfer path P is driven to transfer and sinter the compounding material for sintering.

Hereinafter, a sintering apparatus including a sintering burner according to the present invention will be described with reference to FIG. 7B. At this time, Figure 7b is a perspective view showing the operation of the sintering apparatus including a sintering burner according to the present invention.

As shown in Figure 7b, the sintering apparatus including a sintering burner according to the present invention, a plurality of sintering burner 10 is provided in parallel across the feed path (P) of the sintering compounding raw material, the sintering An ignition unit 20 is provided at the side of the burner 10 for ignition so that a flame may occur in the sintering burner 10.

At this time, the sintering burner 10 has the configuration as described above, since the ignition unit 20 has the same configuration as the ignition unit provided in the general combustion apparatus, description thereof will be omitted.

On the other hand, when the width of the conveying path (P) is small, the length of the nozzle pipe 120 of the sintering burner 10 is provided to be substantially the same as the width of the conveying path (P) to the conveying path (P). The raw material for sintering can be completely sintered up to the compound material for sintering, but when the width of the conveying path P is large, the length of the nozzle tube 120 is substantially equal to the width of the conveying path P. It is difficult to match the same.

Therefore, when the width | variety of the said conveyance path P is large, it is preferable to provide many said sintering burners 10 in parallel. That is, by making the sum of the lengths of the nozzle tubes 120 substantially the same as the width of the conveying path, the sintering compound raw material placed at the side end of the conveying path P is completely sintered.

Hereinafter, the effect of the burner for sintering which concerns on this invention with reference to FIGS. 6A-7B is demonstrated. 6A is a cross-sectional view showing the degree of injection of the flame by the sintering burner virtual, Figure 6b is a cross-sectional view showing the degree of injection of the flame by the sintering burner according to the present invention, Figure 7a is a sintering of the virtual Figure 7b is a perspective view showing the action of the sintering apparatus including a burner, Figure 7b is a perspective view showing the action of the sintering apparatus including a sintering burner according to the present invention.

As shown in FIG. 6A or FIG. 7A, in the sintering apparatus including the virtual sintering burner, the fuel injection unit 12 will be injected in a straight line toward the bottom through the one nozzle, the combustion air Since the time that can be mixed with the combustion air injected from the injection unit 24 is insufficient, the flame cannot be formed stably with a constant straightness, and the injection section (l 화) of the flame is the flame injection section (l2) of the present invention. It will not be long compared to).

However, as illustrated in FIGS. 6B and 7B, according to the sintering apparatus including the sintering burner according to the present invention, the fuel injection unit 100 includes a plurality of injections provided in the pair of nozzle tubes 120. Since the fuel is injected in various directions through the nozzles 125 and 127, a time that can be mixed with the combustion air injected from the combustion air injection unit 200 is sufficient, so that the flame is stably formed with a constant straightness. In addition, the flame spray section (l ₂) is longer than the flame spray section (l₁) of the virtual sintering burner and the sintering apparatus having the same.

Since the difference between the flame spraying zones causes the difference between the contact area between the flame and the transfer path P and the sintering time of the compounding material for sintering, the sintering burner and the sintering apparatus having the same according to the present invention are virtual. Compared with the sintering burner and the sintering apparatus having the same, there is an effect that can maximize the sintering efficiency. That is, according to the sintering burner and the sintering apparatus having the same according to the present invention, the contact area between the flame and the transfer path (P) is wider than the virtual sintering burner and the sintering apparatus having the same, and the predetermined amount of the Complete sintering is achieved because the sintering time for the sintering blend is relatively long.

In addition, in the sintering apparatus including a virtual sintering burner, since the space in which the fuel injected from the fuel injection unit 12 and the combustion air injected from the combustion air injection unit 24 is mixed is narrow, Many unburned fuels will be generated. Since the unburned fuel is burned by the air injected from the flame control air spraying unit 13, the flame control air spraying unit 13 is used to adjust the contact area between the flame and the transfer path P. Difficulties will arise.

However, according to the sintering apparatus including a sintering burner according to the present invention, the combustion air is injected into and around the pair of nozzle pipe 120 in the combustion air injection unit 200, Since the space to be mixed with the fuel injected from the fuel injection unit 100 is large, less unburned fuel is generated. This makes it easy to adjust the contact area between the flame and the transport path (P) by using the air injected from the flame control air injection unit (300).

The embodiments of the present invention described above and illustrated in the drawings should not be construed as limiting the technical idea of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention, as will be apparent to those skilled in the art.

1 is a perspective view of a burner for sintering according to the present invention.

Figure 2 is a side cross-sectional view of the burner for sintering according to the present invention.

3 is a plan view of the burner for sintering according to the present invention.

4 is a bottom view of the burner for sintering according to the present invention.

5 is a cross-sectional view of the nozzle tube of the sintering burner according to the present invention.

6A is a cross-sectional view showing the degree of spraying of a flame by a virtual sintering burner.

Figure 6b is a cross-sectional view showing the degree of injection of the flame by the sintering burner according to the present invention.

Figure 7a is a perspective view showing the operation of the sintering apparatus including a virtual sintering burner.

Figure 7b is a perspective view showing the operation of the sintering apparatus including a sintering burner according to the present invention.

***** Explanation of symbols for the main parts of the drawings *****

  P: transfer path 10: sintering burner

 20: ignition unit

100: fuel injection unit 110: fuel supply pipe

120: nozzle tube 122: head

124,126: Nozzle row 125,127: Injection nozzle

200: combustion air injection unit 210: first duct

220: first air supply pipe 230: central injection nozzle

240: side injection nozzle

300: flame control air injection unit 310: second duct

320: second air supply pipe 330: spray nozzle for air curtain

Claims (2)

It is formed to the same length as the width of the conveying path of the compounding material for sintering, and has a head bent toward the conveying path and the first nozzle row and the second nozzle row provided on one side and the other side of the head to inject fuel, A first nozzle pipe for injecting fuel through a plurality of injection nozzles provided in the first nozzle row and the second nozzle row, and a second nozzle pipe extending in parallel thereto; A first duct disposed inside the lower side, the first duct communicating with a combustion air supply pipe for supplying combustion air and discharging the combustion air from an upper side to a lower side; A central injection nozzle provided below the first duct, for injecting the combustion air between the pair of nozzle tubes; A side injection nozzle disposed below the first duct and configured to inject the combustion air between the pair of nozzle tubes and the lower inner surface of the first duct; A second duct provided at an outer side of the first duct to supply flame control air from an upper side to a lower side; And a spray nozzle for air curtain provided at the lower side of the second duct to inject the flame control air to form an air curtain. The central injection nozzle and the side injection nozzles are provided in a slit shape having the same length as that of the first nozzle pipe and the second nozzle pipe, and the side injection nozzles versus the central injection nozzles provided on one side of the central injection nozzles. The ratio of the slit width of the side injection nozzles provided on the other side of the central injection nozzle is 3 to 4 to 3, so that the fuel injected through the injection nozzles provided in the pair of nozzle tubes and the central injection nozzle and the side surface Combustion air injected from the injection nozzle is mixed well to burn, Flame is generated by burning fuel injected through the injection nozzles provided in the pair of nozzle tubes using the combustion air injected from the central injection nozzle and the side injection nozzle, and by the injection nozzle for the air curtain. The burner for sintering which adjusts the contact area of the said flame and the said transfer path, and the radiation width of the flame using the formed air curtain. The method of claim 1, The injection angle of the injection nozzle is a sintering burner, characterized in that 45 ° relative to the center of the head.

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