JPH0245619Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] The present invention relates to an improvement of a high-speed curtain frame burner used in a heating furnace or the like for heating steel materials. [Prior Art] A conventional high-speed burner for heating steel materials has a configuration as shown in FIGS. 1 and 2, for example. In FIGS. 1 and 2, a is a furnace shell of a heating furnace, b is a steel material to be heated, and c is a high speed burner. In FIG. 1, d is the inner diameter of the nozzle portion, e is the nozzle portion, in FIGS. 1 and 2, f is the frame, and in FIG. 2, g is an arrow indicating the transport direction of the steel material b. . That is, in the conventional high-speed burner c, the nozzle part e is a round single hole with an inner diameter d, so the frame f has a conical shape, and the steel material b is heated as if it were spot heated. The portion directly in contact with the frame f easily becomes hot. [Problems to be solved by the invention] As mentioned above, in the conventional high-temperature burner c, in order to spot-heat the steel material b, the frame f
The problem is that the parts that are directly in contact easily become hot, but other parts are difficult to reach the desired temperature. In other words, the temperature distribution of the steel material b caused by the conventional high-speed burner c is as shown by the curve h shown in the lower part of FIG. is large,
This is an undesirable characteristic. Conventionally, attempts have been made to solve this problem by increasing the number of burners c and making the mounting pitch p as small as possible, but increasing the number not only increases equipment costs but also requires unlimited Problems still remain, such as the inability to reduce the pitch p. The present invention attempts to solve these problems. In other words, the present invention can equalize the temperature distribution of the steel material without reducing the burner mounting pitch, and can prevent scale and dirt from the steel material from entering the nozzle. The purpose of this invention is to provide a high-speed curtain frame burner for steel materials. [Means for Solving the Problems] In order to achieve the above object, the present invention provides a plurality of high-speed burner bodies provided at appropriate intervals, and a plurality of burner bodies adjacent to each other at the tip of each burner body. The burner body is provided with frame guide nozzles separated from each other, and each guide nozzle has a slit-shaped opening through which combustion gas is ejected in a continuous curtain-like manner toward the steel material. Moreover, the opening is provided so that the jetting angle of the jetting combustion gas is 30 degrees to 80 degrees with respect to the steel material. [Function] According to the present invention, a flame guide nozzle with a slit-shaped opening is provided at the tip of the high-speed burner body, so that the combustion gas is ejected at high speed in a continuous curtain shape toward the steel material. , even one high-speed burner can provide a wider range of uniform temperature distribution. Furthermore, since the flame guide nozzles are provided separately from adjacent high-speed burner bodies, the combustion gas ejected from each flame guide nozzle can be controlled for each guide nozzle. Since the nozzle opening has a jetting angle of 30 to 80 degrees relative to the steel material, scale and dirt from the steel material are prevented from entering the guide nozzle without significantly reducing the amount of heat transfer. . [Embodiment] FIGS. 3 and 4 show an embodiment of the present invention. 3 and 4, 1 is a furnace shell of a steel heating furnace, 2 is a high-speed burner main body, 3 is a metal or ceramic frame burner nozzle provided at the tip of the burner main body 2, and 4 is a flame burner nozzle made of metal or ceramic, and 4 is a flame burner nozzle made of metal or ceramic provided at the tip of the burner main body 2 a slit-shaped opening provided in the nozzle 3 at an angle θ (see FIG. 4); 5 a slit guide plate provided outward from the opening 4 in the direction of the angle θ;
6 is a steel material to be heated, 7 is a mounting member to be described later, 8 is a cooling air supply pipe, 9 is a small hole, 10 is a curtain frame, 11 is a moving direction of the steel material 6 (this direction can also be completely reversed). This is an arrow indicating That is, the mounting member 7 is for mounting the high-speed burner main body 2 and the frame guide nozzle 3 to the furnace shell 1, and the cooling air supply pipe 8 is connected to this mounting member 7, and
The cooling air from the supply pipe 8 is supplied to the high speed burner main body 2.
has a small hole 9 introduced into the outer periphery of the tip of the burner body 2, thereby preventing overheating of the tip of the burner body 2 and the nozzle 3.
It also serves as a cooling air nozzle to prevent overheating of the inner surface. Further, the angle θ is between 30 degrees and 80 degrees. A plurality of high-speed burner bodies 2 are provided above and below the steel material 6 to be heated.
The frame guide nozzles 3 are arranged in parallel at appropriate intervals in the direction perpendicular to the frame guide nozzle 3.
As shown in the figure, each of the burner bodies 2 adjacent to each other at the tip of each high-speed burner body 2 is
It is separated from the other by a partition wall. Next, the reason for setting the angle θ to 30 degrees to 80 degrees will be explained. The relationship between the angle θ and the amount of heat transfer is generally proportional to sin θ. Therefore, the maximum value is when the angle θ is 90 degrees, and if this is set to 1.0, then the angle θ is 30 degrees.
It is 0.5 in degrees and 0.985 when the angle θ is 80 degrees. That is, when 30°≦θ≦80°, the amount of heat transfer can be 0.5 to 0.985 compared to when the angle θ is 90 degrees. Here, when θ<30°, the amount of heat transfer is less than 0.5 (50%) and is not effective. Furthermore, since the direction regulating force of the amount of ejected gas is proportional to cosθ, in the vicinity of θ30° = 60°, where the direction regulating force is more than 50%, as shown in Fig. 5, the combustion gas is heated with a limited heating length. Effective use can be achieved. And when θ is between 30° and 80°,
Since the spout of the lower nozzle does not open directly above, even if scale or dirt falls from the steel material 6, it can be prevented from entering the frame guide nozzle 3, and the amount of heat transfer is high at 0.5 to 0.985. Value can be secured. This is shown in Table 1.

[Table] In the high-speed curtain frame burner configured as shown in FIGS. 3 and 4, the combustion gas from the high-speed burner main body 2 is passed through the slit-shaped opening 4 through the flame guide nozzle 3 to the curtain frame 10. As a result, the steel material 6 is heated over a wide range. That is, the combustion gas flows through the slit-shaped opening 4.
Since the steel material 6 is heated by jetting it at high speed in a continuous curtain-like manner from the air to the steel material 6, the temperature distribution of the steel material 6 becomes almost completely uniform, as shown by curve i in the lower diagram of Fig. 3. be. Furthermore, by supplying cooling air within 50% of the theoretical air amount from the cooling air supply pipe 8, the outer periphery of the tip of the high-speed burner body 2 and the inner surface of the frame guide nozzle 3 are cooled, and the air is combusted. Mix with gas.
Further, as shown in FIG. 4, the opening 4 of the nozzle 3 is inclined by an angle θ (30° to 80°), and a slit guide plate 5 is provided in that direction. The amount of heat is not significantly reduced, and in particular, foreign matter such as scale and dust falling from the steel material 6 does not enter the opening 4 of the frame guide nozzle 3 provided below the steel material 6. In addition, each frame guide nozzle 3 is provided at the tip of each high-speed burner main body 2 and separated from the adjacent burner main bodies 2 by a partition wall, so that each guide nozzle 3 can be separated from the other burner main bodies 2 independently. In addition to a uniform pattern, as shown in curve i in FIG. 3, convex, concave, etc. patterns can be freely created in the width direction as needed. [Effects of the invention] As explained above, according to the invention, a flame guide nozzle with a slit-shaped opening is provided at the tip of the high-speed burner body, so that combustion gas is jetted out at high speed in a continuous curtain shape. Because of this structure, even a single high-speed burner can provide a wide range of uniform temperature distribution.Therefore, the number of burners can be reduced, and rapid heating is possible, reducing the time required to heat up the steel material. Moreover, since a continuous curtain-like high-speed high-temperature frame can be obtained, high-temperature sealing of industrial furnaces is possible. In addition, each of the flame guide nozzles is provided at the tip of each high-speed burner main body separately from the adjacent burner main bodies, so that the amount of combustion gas ejected from each flame guide nozzle can be adjusted. Temperature, etc. can be controlled for each guide nozzle. Furthermore, since the opening of the frame guide nozzle has a spray angle of 30 to 80 degrees relative to the steel material, scale and dirt from the steel material can enter the guide nozzle without significantly reducing the amount of heat transfer. This prevents clogging, even after long-term use.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional front view of an example of a steel heating furnace using a conventional high-speed burner, showing the steel temperature distribution; FIG. 2 is a cross-sectional side view taken along cutting line A-A in FIG. 1; Fig. 3 is a front view showing an embodiment of the present invention in cross section and its steel material distribution, and Fig. 4 is a front view showing an embodiment of the present invention.
FIG. 5 is a cross-sectional side view taken along the cutting line B--B in the figure, and is an explanatory view of the operation of the present invention. 2... High-speed burner main body, 3... Frame guide nozzle, 4... Slit-shaped opening, 6... Steel material.

Claims (1)

[Scope of utility model registration request] A plurality of high-speed burner bodies are provided at appropriate intervals, and a frame guide nozzle is provided at each tip of each of the burner bodies to be separated from the adjacent burner bodies, and
Each of the guide nozzles has a slit-shaped opening through which combustion gas is jetted toward the steel material in a continuous curtain shape, and the jetting angle of the combustion gas is 30 degrees or more relative to the steel material. A high-speed curtain frame burner made of steel, characterized in that the opening is provided at an angle of 80 degrees.