JPH0619940Y2 - Burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a burner in which a burner crater portion and a combustion chamber having a slit-like opening toward the burner crater portion are formed between opposing fire-resistant members. .

[Problems to be Solved by Conventional Techniques and Inventions] Conventionally, a burner having a burner crater portion and a combustion chamber having a slit-shaped opening toward the burner crater portion is formed between both opposing burner tiles (refractory members). As disclosed in Japanese Utility Model Publication No. 58-23070, for example, the high temperature surface on the front side of the burner tile facing the combustion chamber, the burner crater portion (reduced diameter opening) and the front surface of the burner and the back surface of the burner tile. There is a large difference in the distance from the low temperature surface on the side depending on the position. Part of the hot surface centering on the burner crater,
That is, the burner front surface, the burner crater portion, and the vicinity of the burner crater portion of the combustion chamber have a long distance to the low temperature surface, whereas the other portions of the high temperature surface have a short distance to the low temperature surface.

Therefore, in the burner tile, the temperature gradient from the high-temperature surface to the low-temperature surface becomes considerably gentle at the corner around the burner crater, and the entire corner becomes hotter than other parts. Then, in the burner tile, a steep temperature gradient is generated between a corner centered on the burner crater and a portion close to the corner.

In that case, a large stress is generated in a portion where the temperature gradient is steep, and a crack is often generated or a breakage is caused in that portion by using for a substantially constant period.

When such a destruction occurs, it is necessary to suspend the equipment and replace the burner tiles each time, which inevitably reduces efficiency.

The present invention has been made in view of the above problems existing in the prior art, and the purpose thereof is to make the temperature gradient of the refractory member relatively uniform by It is an object of the present invention to provide a burner capable of preventing a steep portion from being generated and thus preventing generation of a large stress that causes generation or breakage of a crack in a refractory member.

[Means for Solving the Problems] In order to achieve the above object, a burner according to the present invention includes a burner crater portion and a combustion chamber having a slit-like opening toward the burner crater portion between both fire-resistant members facing each other. In the formed burner, of the two refractory members, the combustion chamber, the burner crater portion, and both surface portions facing the burner front surface are substantially parallel from the combustion chamber portion to the burner front surface through the burner crater portion. It is assumed that the refractory members are curved outwardly from each other by about 90 degrees, and the back surface of each refractory member is curved by substantially 90 degrees in parallel with the respective front surface portions.

[Operation] A burner crater portion and a combustion chamber opening in a slit shape toward the burner crater portion are formed between both fire-resistant members facing each other. And, both surface portions facing the front surface of the burner are curved substantially 90 degrees outward from each other from a substantially parallel state to the front surface of the burner from the combustion chamber portion through the burner crater portion, and the back surface portion of each refractory member is , And the temperature gradient from the front surface side to the back surface side of the refractory member is relatively uniform in any portion, because the surface portions are curved substantially 90 degrees in parallel with each other, and the temperature gradient is It does not become steep. Therefore, it is possible to prevent a large stress that causes the generation or breakage of cracks in the refractory member from occurring due to the temperature rise on the surface side of the refractory member due to the use of the burner.

[Embodiment] An embodiment of the present invention will be described with reference to the drawings.

1 to 5 all relate to one embodiment of the burner of the present invention. FIG. 1 is a cross-sectional view taken along the line I--I in FIG. 2, and FIG. 2 is a schematic plan view. 3 and 4 are enlarged views of the air / gas fuel injection unit, of which FIG. 3 is a cross-sectional view, FIG. 4 (a) is an array view of the gas fuel injection holes, and FIG. FIG. 4B is an array view of air ejection holes, and FIG. 4C is a sectional view taken along line IV-IV in FIG. Further, FIG. 5 is a sectional view of an essential part taken along the line V-O-P-V in FIG.

In this embodiment, air is used as the oxygen-containing gas and gaseous fuel is used as the fuel, but the present invention is not necessarily limited to these.

Reference numeral 10 is an air / gas fuel injection unit, 60 is a burner tile (refractory member), 90 is a furnace wall, and 92 is an inside of the furnace.

The air / gas fuel injection unit 10 is provided at an air secondary pressure equalizing portion 12 having a constricted end in a cross section, a pressure equalizing slit portion 14 having a rectangular cross sectional shape, and an opening portion of the pressure equalizing slit portion 14. Expanded part 16 and slit part 14 for pressure equalization
Column-shaped air ejection hole 18 communicating with the inner bottom surface 14a of the air secondary pressure equalizing portion 12 and the end surface 12a of the air secondary pressure equalizing portion 12, and a gas fuel pressure equalizing chamber 22 adjacent to the air secondary pressure equalizing portion 12 with a sidewall 20 therebetween.
And a columnar gas fuel injection hole 24 that connects the gas fuel pressure equalizing chamber 22 and the expanded portion 16 of the pressure equalizing slit portion 14 to each other, and these are integrally formed. The air / gas fuel injection unit 10 is provided with the casing 2
It is fixed at 6.

The pressure equalizing slit portion 14 extends in a direction perpendicular to the paper surface of FIGS. 1 and 3. Equalizing slit part 1
The width of the inner bottom surface 14a of 4 is 8 mm, and as shown in FIG. 4 (b), the inner bottom surface 14a has a substantially same shape with a diameter of 6.5 mm on the center line in the longitudinal direction. A large number of air ejection holes 18 are formed at a pitch of 8.5 mm. The arrangement of the air ejection holes 18 (oxygen-containing gas ejection holes) is such that the air ejection holes 18 are uniformly distributed over the entire length of the inner bottom surface 14a (the inner bottom portion) of the pressure equalization slit portion 14 and have a density sufficient for equalization. If it does, it may be a staggered arrangement, for example. However, the uniform distribution state does not necessarily need to be a perfect uniform distribution. Further, it is preferable that the opening area of all air ejection holes 18 (oxygen-containing gas ejection holes) is about 20 to 50% of the cross-sectional area of the pressure equalizing slit portion 14.

On the other hand, in the widening portion 16 of the pressure equalizing slit portion 14, a large number of 2.5 mm gas fuel injection holes 24 of substantially the same shape are formed in a row along the lengthwise direction along the entire length at a pitch of 10 mm. There is.

A beam 28 is provided between the side walls 20 of the secondary air pressure equalizing unit 12.

Reference numeral 30 is an air introduction pipe, 32 is an air primary pressure equalizing chamber into which air is introduced from the air introduction pipe 30, and 34 is provided between the air primary pressure equalizing chamber 32 and the air secondary pressure equalizing section 12. It is a straightening plate.

Further, 36 is a gas fuel introduction pipe, 38 is a gas fuel introduction chamber, and the gas fuel introduced into the gas fuel introduction chamber 38 passes through the gas fuel passage (not shown) and the gas fuel equalization chamber 2
2 is configured to be guided.

The three air / gas fuel injection units 10 described above are arranged in series in the slit direction. In this case, the lengths of the air / gas fuel injection units 10 in the slit direction do not have to be the same.

A pair of burner tiles 60 facing each other is provided in front of the air / gas fuel injection unit 10. Between the both burner tiles 60, a slit-shaped mixing chamber 62 in which air and a gaseous fuel are mixed in order toward the front, and a slit-shaped combustion chamber 64 formed by expanding in front of the mixing chamber 62.
Further, a burner crater portion 66 that opens in a slit shape after the combustion chamber 64 is re-reduced is formed. Equalizing slit part 1
The expansion portion 16 provided at the opening of No. 4 constitutes a part of the mixing chamber 62, and the secondary air pressure equalizing portion 12, the air ejection hole 18, the pressure equalizing slit portion 14, the mixing chamber 62, The axes of the combustion chamber 64 and the burner crater portion 66 coincide with each other. Further, the pressure equalizing slit portion 14 is open over the entire length of the mixing chamber 62. The burner crater portion 66 is formed so as to expand toward the front in a trumpet cross-sectional shape.

The burner tile 60 includes a combustion chamber 64 and a burner crater portion 6.
6 and the surface side facing the burner front surface (the surface facing the furnace interior 92) is substantially parallel to the surface side of the other burner tile 60 from the portion of the combustion chamber 64 to the burner front surface through the burner crater portion 66. From the state, they are curved outwardly by approximately 90 degrees, and the back surface side is formed by a wall body that is curved approximately 90 degrees in a direction substantially parallel to the front surface side.
It is fixed to the casing 68. 70 is an anchor brick.

72 is a burner tile 6 by circulating cooling water.
It is a cooling water passage for cooling the back side of 0.

The periphery of the burner tile 60 is surrounded by the furnace wall 90. 94 is a filling that fills the gap between the burner tile 60 and the furnace wall 90.

As shown in FIG. 2, the pair of burner tiles 60 described above are arranged in series in the slit direction. In this case, the lengths of the burner tiles 60 in the slit direction do not have to match.

As shown in FIG. 5, burner tiles 74 similar to those described above are provided at both ends of the burner, but the surface side of the burner tile 74 from the mixing chamber 62 to the burner crater 66 is flat. Is formed in. Reference numeral 76 is a pilot burner mounting hole.

The air introduced from the air introduction pipe 30 is pressure-equalized in the air primary pressure equalizing chamber 32, is subjected to the rectifying action by the rectifying plate 34, and is further equalized in the air secondary pressure equalizing unit 12. While flowing toward the distal end surface 12a of the secondary air pressure equalizing portion 12 while being blocked, the air is guided to each air ejection hole 18 and ejected to the inner bottom surface 14a of the pressure equalizing slit portion 14 through the air ejection hole 18. To do.

Since the large number of air ejection holes 18 opening on the inner bottom surface 14a of the pressure equalizing slit portion 14 have substantially the same shape, the air is ejected substantially uniformly from any of the air ejection holes 18. Since the air ejection holes 18 are evenly distributed over the entire length of the inner bottom surface 14a of the pressure equalizing slit portion 14 and have a density sufficient for pressure equalization, the air ejected to the pressure equalizing slit portion 14 is mixed. In the process of being introduced into the chamber 62, the pressure is substantially equalized over the entire length of the pressure equalizing slit portion 14, and the mixing chamber 62
The air whose pressure is substantially equalized is introduced over the entire length of the air.

On the other hand, the gaseous fuel introduced from the gaseous fuel introduction pipe 36 into the gaseous fuel introduction chamber 38 is guided to the gaseous fuel pressure equalizing chamber 22 through the gaseous fuel passage, passes through the gaseous fuel injection holes 24, and expands the pressure equalizing slit portion 14. In the opening 16, that is, in the mixing chamber 62, it is jetted uniformly over the entire length.

In this way, the substantially equalized air introduced over the entire length of the mixing chamber 62 is mixed with the gaseous fuel jetted out evenly over the entire length of the mixing chamber 62, so that it is Burning is substantially even over the entire length of the combustion chamber 64, and a substantially uniform flame is formed from the burner crater 66 toward the furnace interior 92.

Further, since the air / gas fuel injection unit 10 is integrally formed, the air injection hole 18 and the pressure equalizing slit portion 1 are formed.
4 can be easily and accurately formed and maintained over the entire length of the pressure equalizing slit portion 14, and even if the pressure equalizing slit portion 14 is relatively long, the remaining air ejection holes 18 remain. The width can be easily and accurately maintained by the wall 40. Therefore, substantially equalized air can be easily introduced into the mixing chamber 62 over the entire length of the three air / gas fuel injection units 10 in series, thereby forming a substantially uniform flame. it can.

The gaseous fuel burns in the combustion chamber 64, and the flame formed thereby is formed from the burner crater portion 66 toward the furnace interior 92, so that the combustion chamber 64, the burner crater portion 66, and the burner facing the furnace interior 92. The surface side of the tile 60 becomes hot.

However, in this burner tile 60, the surface side facing the combustion chamber 64, the burner crater portion 66, and the burner front surface reaches the burner front surface from the portion of the combustion chamber 64 through the burner crater portion 66 to the burner front surface. A wall body that is curved approximately 90 degrees outwardly from a state that is substantially parallel to the front surface side, and a back surface side is formed by a wall that is curved approximately 90 degrees substantially parallel to the front surface side, and the burner crater portion 66 faces forward. Since the flakes are spread in a trumpet cross-sectional shape, the temperature gradient from the front surface side to the back surface side of the burner tile 60 has a relatively uniform temperature gradient from any portion from the combustion chamber 64 to the burner front surface to the back surface side. As a result, the temperature gradient does not become partially steep. Therefore, it is possible to prevent a large stress that causes the generation or breakage of cracks in the burner tile 60 from occurring due to the temperature rise on the surface side of the burner tile 60.

[Advantage of the Invention] In the burner of the present invention, the temperature gradient from the front surface side to the back surface side of the refractory member becomes relatively uniform in any portion, and the temperature gradient does not become steep in part. So
It is possible to prevent a large stress that causes the generation or breakage of cracks in the refractory member from occurring due to the temperature rise on the surface side of the refractory member due to the use of the burner. Therefore, the life of the burner crater and the combustion chamber that opens in a slit shape toward the burner crater can be dramatically extended compared to the conventional case, and the cost required for replacing the refractory member can be reduced and the equipment can be suspended during that period. It is possible to significantly improve the efficiency as a whole by avoiding the above.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings are all related to one embodiment of the present invention. 1 is a cross-sectional view taken along the line I-I in FIG. 2, and FIG. 2 is a schematic plan view. 3 and 4 are enlarged views of the air / gas fuel injection unit 10, of which FIG. 3 is a cross-sectional view, and FIG. 4 (a) is an array view of the gas fuel injection holes 24, FIG. Figure (b) is an array of air ejection holes 18, Figure 4 (c)
FIG. 4 is a sectional view taken along line IV-IV in FIG. Figure 5 shows the first
FIG. 5 is a cross-sectional view taken along the line V-O-P-V in the figure. In the drawing, 60 is a burner tile, 64 is a combustion chamber, and 66 is a burner crater.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norio Sakaba 5-3 Tokai-cho, Tokai-shi, Aichi Pref., Nippon Steel Co., Ltd. Nagoya Works Works (56) Bibliographic Reference Sho 58-23070 (JP, Y2) Actual public Sho 63-6584 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A burner in which a burner crater portion and a combustion chamber that opens in a slit shape toward the burner crater portion are formed between two fire-resistant members facing each other. Both surface portions facing the crater portion and the front surface of the burner are curved substantially 90 degrees outward from each other in a substantially parallel state from the portion of the combustion chamber through the burner crater portion to the front surface of the burner. The burner is characterized in that the portions are curved substantially 90 degrees in parallel with the respective surface portions.