JP2000065322A - Heating furnace burner equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heating furnace burner equipment in which the inside of the furnace including the neighbourhood of a gas discharge section can be heated evenly, and production of NOx can be suppressed. SOLUTION: There are provided as a gas supply section 50 a main gas supply section 5 and a sub gas supply section 51. On the main gas supply section 5 there is provided a main combustion burner 5a for supplying main combustion gas G1, and there is provided an auxiliary combustion burner 5b for supplying auxiliary combustion gas G2 and oxygen rich gas A1 for combusting the auxiliary combustion gas G2 to form an auxiliary flame 14, and for heating the main combustion gas G1. There is further provided a sub gas supply section 51 for injecting the combustion gas G into the furnace at an injection speed slower than the injection speed of the combustion gas from the main gas supply section 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a gas supply unit for supplying a combustion gas into a furnace, and an air supply unit for supplying combustion air to the furnace. The present invention relates to a burner facility for a heating furnace for mixing and burning the combustion air in a furnace space near the gas supply unit and the air supply unit.

[0002]

2. Description of the Related Art Conventionally, in this type of heating furnace burner equipment, fuel and combustion air are separately supplied to the inside of the furnace, and the fuel and combustion air are supplied to a fuel supply unit and In some cases, a flame is formed inside the furnace by mixing and burning in the vicinity of the air supply unit, and the object to be heated is evenly heated.

[0003]

However, when the inside of the heating furnace is heated using the above-mentioned conventional heating furnace burner equipment, there are the following problems. For example, when the heating furnace is a glass melting furnace, the furnace temperature is set to 1500 to 160
It needs to be 0 ° C. In this case, it is difficult to store the glass raw material in a container or the like and indirectly heat it. Therefore, the glass raw material is mainly heated by radiant heat of a flame. However, when burning LPG or methane-based combustion gas, the unburned portion is long formed near the base of the flame, so that the temperature near the combustion burner decreases. For this reason, it becomes difficult to uniformly dissolve the glass raw material. In order to solve this problem, when the supply amount of the combustion gas is increased to increase the temperature near the combustion burner and the gas combustion amount in the high temperature combustion region is increased, the temperature of the high temperature combustion region becomes lower. As a result, the generation amount of NOx increases, and the flame becomes large and the heating furnace is easily damaged. This situation will be described with reference to FIG. In the figure, the horizontal axis indicates the distance in the gas discharge direction from the combustion gas discharge section into the furnace, and the vertical axis indicates the temperature. In this figure, the two-dot chain line indicates the result of the conventional type in which only the combustion gas is supplied from the combustion gas supply unit and the combustion air is supplied from the air supply unit. Here, for example, the combustion gas is city gas, which is mainly composed of methane. Furthermore, the dashed line shows the result of a simple one provided with the main combustion burner and the auxiliary combustion burner proposed by the inventors, and without the auxiliary gas supply unit which is a feature of the present invention described later. . On the other hand, the solid line shows the result of the one shown by the one-dot chain line with the auxiliary gas supply unit. Referring to FIG. 4, the problem described above in the present case will be described. In the case where a combustion gas containing methane as a main component is used, as shown by a two-dot chain line, a position where the high-temperature portion is separated from the discharge port. However, there is still room for improvement in that the high-temperature portion is not sufficiently moved to the discharge port side, even if the high-temperature portion is proposed by the inventors and is indicated by a dashed line.

An object of the present invention is to solve the above-mentioned drawbacks of the prior art, to uniformly heat the inside of a furnace, and to obtain NOx.
It is an object of the present invention to provide a furnace for a heating furnace capable of suppressing generation of the burner.

[0005]

(Structure 1) The burner equipment for a heating furnace according to the present invention (see FIGS. 1 to 3) has a main gas supply section 5 as a gas supply section 50 as described in claim 1. And the auxiliary gas supply unit 51, and the main gas supply unit 5 is provided with the main combustion burner 5a for supplying the main combustion gas G1, and the auxiliary combustion gas G2 and the auxiliary combustion gas G2 are burned. The oxygen-enriched gas A1 and the auxiliary flame 1
4, an auxiliary combustion burner 5b for heating the main combustion gas G1 is provided, and the combustion gas is discharged into the furnace at a discharge speed lower than the discharge speed of the combustion gas from the main gas supply unit 5. It is characterized in that the auxiliary gas supply unit 51 is provided. (Operation / Effect) In this configuration, a combustion gas is supplied into the furnace from both the main gas supply unit and the sub gas supply unit, and a combustion flame is formed in the furnace. In this case, with respect to the main gas supply section, by heating the main combustion gas with the auxiliary combustion burner, the main combustion gas can be heated to a high temperature before being injected into the furnace. The gas can be pyrolyzed to generate carbon (C). As a result, the flame brightness and the burning speed of the main combustion gas are improved, and the main combustion gas forms a flame immediately after being ejected from the main combustion burner. As a result, the inside of the furnace can be heated evenly. This effect is apparent from the temperature distribution between the two-dot chain line and the one-dot chain line in FIG. Further, from the auxiliary gas supply unit, the combustion gas into the furnace at a speed lower than the gas discharge speed in the main gas supply unit,
The combustion gas is discharged. Generally, since an oxidizing atmosphere exists in the furnace, the combustion gas supplied from the auxiliary gas supply unit can be burned in this way. Here, the discharge speed of the combustion gas from the auxiliary gas supply unit is:
Since the discharge speed is lower than the discharge speed from the main gas supply unit, a flame is formed on the side close to the discharge port, and a high-temperature portion is formed. Therefore, in FIG. 4, the result shown by the solid line provided with the auxiliary gas supply unit is even better than that of the inventors' proposal shown by the dashed line. Further, when viewed as a whole furnace, the flame can be made uniform and the local temperature rise of the main flame can be suppressed, so that the generation of NOx can also be suppressed. Furthermore, in this configuration, the formation of the auxiliary flame is ensured because the oxygen-enriched gas is supplied to form the auxiliary flame, and even if the flow rate of the main combustion gas is large, The auxiliary flame is not blown out by the main combustion gas, and the main combustion gas can be reliably heated.

[0006] The oxygen-enriched gas is a gas having a higher oxygen content than air or pure oxygen. Therefore, when the auxiliary flame is formed by using the oxygen-enriched gas, the heating effect of the main combustion gas obtained by the auxiliary flame is enhanced as compared with the case where the auxiliary flame is formed by using air. .

(Structure 2) In the burner equipment for a heating furnace according to the present invention (see FIGS. 1 to 3), the discharge direction of the gas from the sub gas supply section 51 is set to the main gas supply. Part 5
It is preferable to be in a position parallel or twisted to the direction in which the gas is discharged from. (Operation / Effect) In this structure, the flame from the main gas supply section and the flame from the sub gas supply section do not intersect,
Since the flame from the auxiliary gas supply unit is formed at the site where the conventional flame was stagnant with respect to the flame from the main gas supply unit, the state of the flame formed in the furnace space can be further uniformed. . Here, it is preferable that the main flow of the combustion gas from the auxiliary gas supply unit intersects with the main flow of the combustion air supplied from the air supply unit. With this configuration, it is easy to control the position where the combustion flame of the combustion gas from the auxiliary gas supply unit is formed.

(Structure 3, Function and Effect) The burner equipment for a heating furnace according to the present invention (see FIGS. 1 to 3) further discharges gas from the auxiliary gas supply section 51 as described in claim 3. It is preferable that the speed is set within a range of 10 to 50% with respect to the discharge speed of the gas from the main gas supply unit 5. If it is higher than the upper limit of 50%, the gas from the sub gas supply unit is easily sucked into the flame from the main gas supply unit, and the flame from the sub gas supply unit may not be formed. If it is lower than the lower limit of 10%, it is difficult to obtain the effect of providing the auxiliary gas supply unit 51 and forming a flame in a sense of complementing the flame formed corresponding to the main gas supply unit 5.

(Structure 4, Function / Effect) In the burner equipment for a heating furnace according to the present invention (see FIGS. 1 to 3), the discharge amount of gas from the sub-gas supply section is further described as in claim 4. Is preferably set within a range of 10 to 60% with respect to the total amount of gas discharged from the main gas supply unit and the sub gas supply unit. If it is higher than the upper limit of 60%,
When the heating effect by the flame from the main gas supply unit is weakened and is lower than the lower limit of 10%, a sub gas supply unit is provided to reduce the flame in the sense of complementing the flame formed corresponding to the main gas supply unit. It is difficult to obtain the effect of forming.

(Structure 5, Function / Effect) The burner equipment for a heating furnace according to the present invention (see FIGS. 1 to 3), as described in claim 5, relates to the main gas supply section 5 for the auxiliary combustion. The supply amount of the auxiliary combustion gas G2 to the burner 5b can be set smaller than the supply amount of the main combustion gas G1 to the main combustion burner 5a. That is, the auxiliary combustion burner according to the present invention does not directly heat the object to be heated, but only heats the main combustion gas supplied from the main combustion burner. Therefore, even if a smaller amount of auxiliary combustion gas is used than the main combustion gas, the main combustion gas can be sufficiently heated. In the main gas supply section 5, the main combustion burner 5a may be formed coaxially with the auxiliary combustion burner 5b, and may be formed outside the auxiliary combustion burner 5b. That is, in order to most efficiently heat the main combustion gas using the auxiliary flame formed by the auxiliary combustion burner, the main combustion burner is formed on the entire outer periphery of the auxiliary combustion burner. It is thought that it is good to do. In addition, such a burner can be manufactured relatively easily. Further, regarding the main gas supply unit 5,
The auxiliary combustion burner 5b can be configured by providing a cylindrical member 16 at the tip thereof. By providing the cylindrical member in this manner, the flow of the main combustion gas and the auxiliary flame formed at the tip of the auxiliary combustion burner can be reliably separated. The inconvenience of blowing out the flame can be prevented. Further, with respect to the main gas supply unit 5, the tip of the auxiliary combustion burner 5b is retracted more than the tip of the main combustion burner 5a,
A space surrounded by the main combustion burner 5a may be provided on the tip side of the auxiliary combustion burner 5b.
In this way, by providing the space surrounded by the main combustion burner, the main combustion gas that has passed around the auxiliary flame can be restrained from diffusing for a while. As a result, the amount of thermal energy transmitted from the auxiliary flame to the main combustion gas increases, and the heating effect of the main combustion gas can be enhanced.

(Structure 6) In the burner equipment for a heating furnace according to the present invention (see FIG. 8), as described in claim 6, the gas supply unit 5 is provided.
0, a main gas supply unit 5 and a sub gas supply unit 51 are provided, a main combustion burner 5a for supplying the main combustion gas G1 to the main gas supply unit 5, and an oxygen gas inside the main combustion gas G1. An auxiliary burner 5c for heating the main combustion gas G1 by supplying the enriched gas A1 and burning a part of the main combustion gas G1 to form an auxiliary flame 14; At a discharge speed lower than the discharge speed of the combustion gas of
It can be configured by providing an auxiliary gas supply unit 51 for discharging a combustion gas in the furnace. (Operation / Effect) In this configuration, a combustion gas is supplied into the furnace from both the main gas supply unit and the sub gas supply unit, and a combustion flame is formed in the furnace. In this case, regarding the main gas supply unit, if a part of the main combustion gas is burned with the oxygen-enriched gas supplied from the auxiliary burner and the main combustion gas is heated, the main combustion gas is supplied to the furnace. It can be heated to a high temperature before being injected into the inside, and the main combustion gas can be pyrolyzed to generate carbon (C). As a result, the flame brightness and the burning speed of the main combustion gas are improved,
The main combustion gas forms a flame immediately after being jetted from the main combustion burner, and a good heating effect is exerted even near the burner. The inside can be heated evenly. Further, the combustion gas is discharged from the auxiliary gas supply unit into the furnace at a speed lower than the discharge speed of the gas in the main gas supply unit. Generally, since an oxidizing atmosphere exists in the furnace, the combustion gas supplied from the auxiliary gas supply unit can be burned in this way. Here, the discharge speed of the combustion gas from the auxiliary gas supply unit is slower than the discharge speed from the main gas supply unit. As a result, a flame is formed on the side close to the discharge port, and Part will be formed. Therefore, it is even better than the one proposed by the inventor indicated by the dashed line in FIG. Further, when viewed as a whole furnace, the flame can be made uniform and the local temperature rise of the main flame can be suppressed, so that the generation of NOx can also be suppressed.
Furthermore, in this configuration, the formation of the auxiliary flame is ensured because the oxygen-enriched gas is supplied to form the auxiliary flame, and even if the flow rate of the main combustion gas is large, The auxiliary flame is not blown out by the main combustion gas, and the main combustion gas can be reliably heated.

In the description of the means for solving the above problems, reference is made to the drawings, and in order to facilitate comparison with the drawings, reference characters will be described. However, the present invention is limited to the configuration of the accompanying drawings. Not something.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a glass melting furnace 1a as an example of a heating furnace 1 using the heating furnace burner equipment of the present invention. FIG. 1 is a side view when viewed from the same direction as the conveying direction of the glass raw material 2, and FIG.
It is II plane sectional drawing. The glass melting furnace 1a has a symmetrical configuration with respect to the direction in which the glass raw material 2 is conveyed. As shown in FIG. 1, a melting tank 3 is provided at the center, and a gas supply unit 50 for supplying a combustion gas G is provided above a furnace wall 4 forming both sides of the melting tank 3. And an air supply unit 6 for supplying air A. Further, a heat storage chamber 7 is provided on the outside. Here, the gas supply unit 50
In the case of the present application, as shown in FIG. 2, a main gas supply unit 5 having a burner capable of burning itself and a sub-gas supply unit having only a nozzle for supplying combustion gas into the furnace are provided. A gas supply unit 51 is provided. FIG. 1 shows a cross section passing through the main gas supply unit 5. As shown in FIG. 3, a pair of sub-gas supply units 51 are provided for the main gas supply unit 5 in the arrangement direction of the main gas supply unit 5 (the moving direction of the raw material shown in FIG. 2). I have.

FIG. 1 shows the inside of the glass melting furnace 1a.
A case is shown in which the combustion air A is supplied from the air supply unit 6 on the left side and the combustion gas G is supplied from the gas supply unit 50 provided below the air supply unit 6. The glass melting furnace 1a is of a so-called underport type. After the combustion air A is heated in the heat storage chamber 7 on the left side, the glass melting furnace 1a
Supplied inside. The combustion gas G and the combustion air A are mixed and burned in the glass melting furnace 1a near the gas supply unit 50 and the air supply unit 6. The combustion gas G forms a flame 8 inside the glass melting furnace 1a, and melts the glass raw material 2 by radiant heat of the combustion. As shown in FIG. 2, in the glass melting furnace 1a, the flame 8 is formed in a direction perpendicular to the direction in which the glass raw material 2 is conveyed. The glass melting furnace 1
The ceiling part a has an arch shape and has a function of reflecting the radiant heat from the flame 8.

The combustion exhaust gas g generated by the combustion is discharged through the air supply section 6 where the flame 8 is not formed and the heat storage chamber 7. That is, the air supply unit 6 and the heat storage chamber 7 also function as the exhaust gas discharge unit 9. The combustion side and the exhaust side alternate their roles at predetermined time intervals, and so-called alternating combustion is performed. The heat storage chamber 7 is provided with a heat storage material such as a brick 10, for example, and stores heat retained in the combustion exhaust gas g while functioning as the exhaust gas discharge unit 9.
The heat storage is used as a heat source for heating the combustion air A when functioning as the air supply unit 6 later. still,
In FIG. 2, the glass raw material 2 flows down the inside of the melting tank 3 from the input port toward the work tank 11. A partition 13 having an insertion hole 12 is provided between the melting tank 3 and the work tank 11 so that only the glass that has been melted and refined is guided to the work tank.

FIG. 3 shows a main gas supply section 5 according to the present invention.
And a cross section of the auxiliary gas supply unit 51. The main gas supply unit 5
It comprises a main combustion burner 5a and an auxiliary combustion burner 5b. The main combustion gas G1 is output from the main combustion burner 5a.
Only, the auxiliary combustion burner 5b supplies the auxiliary combustion gas G2 and the oxygen-enriched gas A1.
The auxiliary combustion burner 5b is provided with the main combustion burner 5a.
For heating the main combustion gas G1 supplied from the fuel cell. The main combustion gas G1 and the auxiliary combustion gas G
For 2, the same kind of gas is usually used, but another kind of gas may be used. The main combustion burner 5a and the auxiliary combustion burner 5b are formed, for example, in a cylindrical shape with a coaxial core, and the main combustion burner 5a is formed outside the auxiliary combustion burner 5b. An auxiliary flame 14 is formed by supplying the auxiliary combustion gas G2 and the oxygen-enriched gas A1 for burning the auxiliary combustion gas G2 to the auxiliary combustion burner 5b. In order to form the auxiliary flame 14 reliably, an ignition source 15 may be provided at the tip of the auxiliary combustion burner 5b as shown in FIG. The ignition source 15 is configured by attaching, for example, a source that generates heat by energizing a heating wire and is inserted into the auxiliary combustion burner 5b.
However, if the auxiliary flame 14 can be easily ignited, the ignition source 15 is not always necessary. The main combustion gas G1 is supplied to the periphery of the auxiliary flame 14 from the main combustion burner 5a. As a result, the main combustion gas G1 is heated by the auxiliary flame 14. Thus, to form the auxiliary flame 14, the oxygen-enriched gas A1
When the auxiliary combustion gas G2 is supplied, the auxiliary combustion gas G2 burns quickly, so that the formation of the auxiliary flame 14 is ensured. Even if the flow rate of the main combustion gas G1 is large, the auxiliary combustion gas G2 is The auxiliary flame 14 does not blow out, and the main combustion gas G1 can be reliably heated. Most of the oxygen-enriched gas A1 supplied to the auxiliary combustion burner 5b is consumed to form the auxiliary flame 14.

When the main combustion gas G1 contains, for example, methane (CH ₄ ) as a main component, the main combustion gas G1
Is thermally decomposed by being heated by the auxiliary flame 14 to generate carbon (C). The carbon (C) improves the flame brightness of the main combustion gas G1. In addition, the combustion speed of the main combustion gas G1 can be improved by heating the main combustion gas G1. Therefore, in the related art, the combustion is started only after mixing with the combustion air A, and the main combustion gas G1 that has generated the radiant heat reacts with the combustion air A at an early stage. Inside, the main flame 8 is formed from the vicinity of the main combustion burner 5a. That is, the main combustion gas G
Since the high temperature region is formed from the vicinity of the main combustion burner 5a by the combustion of No. 1, the temperature inside the furnace can be averaged, and the generation of an extremely high temperature region can be suppressed to reduce NOx. Can be reduced.

In this embodiment, as shown in FIG. 3, a cylindrical member 16 is provided at the tip of the auxiliary combustion burner 5b in order to efficiently heat the main combustion gas G1. The tubular member 16 has a function of protecting the auxiliary flame 14 formed at the tip of the auxiliary combustion burner 5b. In other words, by isolating the auxiliary flame 14 from the flow of the main combustion gas G1, the auxiliary flame 14 is not disturbed by the flow of the main combustion gas G1, and the disadvantage that the auxiliary flame 14 disappears. Can be avoided. Further, when the cylindrical member 16 is not provided, it is possible to prevent a situation in which the oxygen-containing gas A1 supplied to the auxiliary combustion burner 5b diffuses inside the main combustion burner 5a and the auxiliary flame 14 disappears. Note that the cylindrical member 16 may be formed of a complete cylindrical member 16 or a wire mesh member as long as the above-mentioned function can be maintained. The tubular member 16 can be formed using a heat-resistant metal or the like.

As shown in FIG. 3, the tip of the auxiliary combustion burner 5b is retracted further outside the furnace than the tip of the main combustion burner 5a. With this configuration, the main combustion gas G1 can be heated in a state where the diffusion of the main combustion gas G1 is prevented, so that the main combustion gas G1 can be reliably heated. Also, the main combustion gas G to be injected
1 can be made to converge more, and the main flame 8 can have straightness. Note that the amount of the auxiliary combustion gas G2 supplied to the auxiliary combustion burner 5b is set to be equal to the amount of the main combustion burner 5a because the purpose of the auxiliary combustion burner 5b is to heat the main combustion gas G1. It is sufficient to set the supply amount to be smaller than the supply amount of the main combustion gas G1. For example, the total amount of the auxiliary combustion gas G2 burned by the auxiliary combustion burner 5b is about 1 to 30% of the total amount of the combustion gas G supplied to the main combustion burner 5a and the auxiliary combustion burner 5b. .

As described above, only with respect to the flame formed by the combustion gas from the main gas supply unit 5,
By providing a configuration in which the main combustion gas G1 is heated by the auxiliary combustion burner 5b, it is possible to provide a heating furnace burner that not only can heat the inside of the furnace substantially uniformly, but also can suppress the generation of NOx. be able to.

As described above, in the present application, the sub-gas supply unit 51 is provided for the main gas supply unit 5. The auxiliary gas supply unit 51 has a nozzle maximum diameter of the main combustion burner 5a provided in the main gas supply unit 5 (see FIG. 3,
8 and 9) as the reference length dimension L, it is in contact with the outer periphery of the main combustion burner 5a or from the center of the main gas supply section 5 perpendicular to the gas discharge direction (up and down in FIG. 3). (In direction) evenly at a position of 25L or less. The auxiliary gas supply unit 51 is provided with a combustion gas nozzle 52 for supplying a combustion gas to the furnace space. On the base end side of the combustion gas nozzle 52, a configuration is adopted in which the discharge speed of the combustion gas discharged from the nozzle 52 is lower than the average gas discharge speed in the main gas supply unit 5. Has been adopted. That is, the discharge port diameter is determined at the design stage so as to satisfy the requirements. Further, a valve 53 may be provided on the upstream side of the supply unit 51 to adjust the gas flow rate. Therefore, the combustion gas is discharged from the nozzle 52 at a relatively low speed, and a flame can be formed in a portion close to the nozzle 52. The discharge speed of the gas from the sub gas supply unit 51 is set within a range of 10% to 50% of the discharge speed of the gas from the main gas supply unit 5. Actually, the discharge speed of the gas from the main gas supply unit 5 is 70 to 80.
With respect to m / s, the discharge speed of the gas from the sub gas supply unit 51 is about 10 to 20 m / s. Further, the discharge amount of the gas from the sub gas supply unit 51 is 10 to 60 with respect to the total discharge amount of the gas from the main gas supply unit 5 and the sub gas supply unit 51.
It is set within the range of%. More preferably, 20 to 40
%. By the way, the combustion air A discharged from the air supply unit 6 includes not only the combustion gas supplied from the main gas supply unit 5 but also the combustion gas supplied from the auxiliary gas supply unit 51. A crossover / mixing configuration is adopted, and combustion is performed by directly receiving the supply of combustion air. However, in the case of the present application, the combustion gas from the auxiliary gas supply unit 51 can be burned in the furnace space even when the direct supply of combustion air is not performed, and the direct supply of combustion air is Not a necessary requirement. Further, as shown in FIG.
In the illustrated example, the direction of gas discharge from the sub gas supply unit 51 is parallel to the direction of gas discharge from the main gas supply unit 5 in plan view. However, while the gas discharge direction of the main gas supply unit 5 is tilted upward from the horizontal direction, the discharge direction of the sub gas supply unit 51 is tilted downward from the discharge direction on the main gas side. Therefore, the two discharge directions are in a twisted positional relationship.

[Other Embodiments] <1> In the above embodiment, a pair of auxiliary gas supply units 51 is provided in the moving direction of the raw material with respect to the single main gas supply unit 5. However, the number of the main gas supply units 5 and the number of the sub gas supply units 51 or the arrangement thereof can be arbitrarily selected. However, in a state in which a flame is formed by the main gas supply unit 5, a combustion gas is supplied to a stagnation position on the gas discharge side, and a flame is formed in this portion. It is preferable that a combustion flame can be formed on the side close to the part where the gas supply part opens in the space. Further, in such a supply section, it is possible to impart a swirl component to the gas flow, and to improve the convergence of the flame by the swirl. in this case,
Since it is easy to specify the heating site by the combustion gas supplied from each supply unit, it is easy to control the furnace temperature distribution. Here, as a method of giving the swirling component to the gas, a known method such as providing a guide near the discharge portion or providing a nozzle having a plurality of gas flow paths for giving a swirling component to the discharge port can be adopted.

<2> In the above embodiment, the main combustion gas G1 and the auxiliary flame 14 are separated by the cylindrical member 16, and the tip of the auxiliary combustion burner 5b is separated from the tip of the main combustion burner 5a. Although it is configured to be retracted to the outside of the glass melting furnace 1a, as shown in FIG. 5, both ends may be configured to have the same length,
As shown in FIG. 6, the tip of the auxiliary combustion burner 5b is retracted to the outside of the glass melting furnace 1a from the tip of the main combustion burner 5a, and the tubular member 16 is not provided. As shown in FIG. 7, the tip of the main combustion burner 5a and the tip of the auxiliary combustion burner 5b may have the same length, and the tubular member 16 may not be provided. In short, the main combustion gas G1 can be reliably heated while maintaining the ignition state of the auxiliary flame 14, and any configuration can be used as long as the injection direction of the main combustion gas G1 can be controlled to some extent. There may be.

<3> Further, as shown in FIG. 8, in the burner equipment for a heating furnace according to the present invention, the main gas supply section 5 includes a main combustion burner 5a for supplying a main combustion gas G1, and a main combustion burner 5a for the main combustion. The auxiliary burner 5 that supplies the oxygen-enriched gas A1 to the inside of the gas G1 and burns a part of the main combustion gas G1 to form the auxiliary flame 14, thereby heating the main combustion gas G1.
c (this burner does not include a combustion gas unlike the auxiliary combustion burner described above). That is, here, only the oxygen-enriched gas A1 is supplied from the auxiliary burner 5c. Since the oxygen-enriched gas A1 reacts with the main combustion gas G1 and quickly burns, the desired gas for the main combustion gas G1 is supplied without supplying the auxiliary combustion gas to the auxiliary burner 5c as in the above embodiment. The heating function can be sufficiently obtained. In this case, since the oxygen-enriched gas A1 and the main combustion gas G1 must be positively mixed, the cylindrical member 16 is not provided at the tip of the auxiliary burner 5c.

If the main combustion gas G1 is heated by burning a part of the main combustion gas G1 with the oxygen-enriched gas A1 supplied from the auxiliary burner 5c as in the present configuration, the main combustion gas G1 Can be heated to a high temperature before being injected into the furnace, and the main combustion gas G1 is thermally decomposed to produce carbon (C).
Can be generated. As a result, the main combustion gas G
The main combustion gas G by increasing the flame brightness and the burning speed
1 forms the main flame 8 immediately after being injected from the main combustion burner 5a. As a result, a good heating effect is exhibited in the vicinity of the main combustion burner 5a. Becomes possible. Moreover, as a result of suppressing the local temperature rise of the main flame 8, the generation of NOx can also be suppressed. Further, in this configuration, the auxiliary flame 14
Since the oxygen-enriched gas A1 is supplied to form the auxiliary combustion gas 14, the formation of the auxiliary flame 14 is ensured.
Even when the flow velocity of the gas is large, the auxiliary flame 14 does not blow out by the main combustion gas G1, and the main combustion gas G1 can be reliably heated.

<4> The distal end of the main combustion burner 5a or the distal end of the auxiliary gas supply unit 51 may have a reduced inner diameter as shown in FIG. 9 or an enlarged inner diameter as shown in FIG. can do. That is, the main combustion burner 5
Referring to FIG. 9A, in the case of FIG.
In the case of FIG. 10, the pipe expanding member 18 can be screwed to the tip of the main combustion burner 5a. The length and shape of the flame 8 can be easily changed by attaching the throttle member 17 or the expansion member 18. For example, when the throttle member 17 is attached, the flow rate of the main combustion gas G1 increases, and a short flame 8 is formed. Conversely, when the pipe expansion member 18 is attached, the flow velocity of the main combustion gas G1 decreases, and a long flame is formed.

<5> In the above embodiment, the glass melting furnace 1
As a type of a, the flame 8 is formed in a direction perpendicular to the conveying direction of the glass raw material 2, but as shown in FIG. 11, the flame 8 is formed in the conveying direction of the glass raw material 2. You may. In the case of this alternative embodiment, for example, four sets of gas supply units 5 and air supply units 6 are provided on the input side of the glass raw material 2, and the heat storage chamber 7 is provided on the upstream side of the gas supply units 5 and the like. Is provided. Then, two sets of each of the left and right sides are alternately burned while being distinguished between the combustion side and the exhaust side.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of a heating furnace using the heating furnace burner equipment of the present invention.

FIG. 2 is a cross-sectional plan view taken along the line II-II in FIG.

FIG. 3 is a sectional view of a gas supply unit.

FIG. 4 is a diagram showing a distribution of a furnace temperature.

FIG. 5 is a longitudinal sectional view of a gas supply unit according to another embodiment.

FIG. 6 is a longitudinal sectional view of a gas supply unit according to another embodiment.

FIG. 7 is a longitudinal sectional view of a gas supply unit according to another embodiment.

FIG. 8 is a longitudinal sectional view of a gas supply unit according to another embodiment.

FIG. 9 is a longitudinal sectional view of a gas supply unit according to another embodiment.

FIG. 10 is a longitudinal sectional view of a gas supply unit according to another embodiment.

FIG. 11 is a furnace structural diagram according to another embodiment.

[Explanation of symbols]

 Reference Signs List 1 heating furnace 5 main gas supply section 5a main combustion burner 5b auxiliary combustion burner 5c auxiliary burner 14 auxiliary flame 50 gas supply section 51 sub gas supply section A combustion air A1 oxygen-enriched gas G1 main combustion gas G2 auxiliary combustion For gas

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Koji Tatsuta 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Prefecture Inside Osaka Gas Co., Ltd. (72) Koichi Ichiki Hirano-cho, Chuo-ku, Osaka-shi, Osaka 1-2-2, Osaka Gas Co., Ltd. (72) Inventor Makoto Hirano 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Prefecture F-term in Osaka Gas Co., Ltd. 3K017 CA03 CA06 CB02 CC08 CD03 3K019 AA01 AA06 BA02 BA04 BB01 BD02

Claims (6)

[Claims] A gas supply unit for supplying a combustion gas into a furnace and an air supply unit for supplying a combustion air to the furnace are separately provided, and the combustion gas and the combustion air are separated from each other. A heating furnace burner device for mixing and burning in a furnace space near the gas supply unit and the air supply unit, wherein a main gas supply unit and a sub gas supply unit are provided as the gas supply unit. In the supply section, a main combustion burner for supplying a main combustion gas is provided, and an auxiliary flame is formed by supplying an auxiliary combustion gas and an oxygen-enriched gas for burning the auxiliary combustion gas. Heating provided with an auxiliary combustion burner for heating the combustion gas, and provided with the auxiliary gas supply unit for discharging the combustion gas into the furnace at a discharge speed lower than the discharge speed of the combustion gas from the main gas supply unit; Furnace burner equipment. 2. The heating furnace according to claim 1, wherein a discharge direction of the gas from the sub-gas supply unit is parallel to or twisted from a discharge direction of the gas from the main gas supply unit. Burner equipment. 3. The discharge speed of the gas from the sub-gas supply unit is higher than the discharge speed of the gas from the main gas supply unit.
The burner equipment for a heating furnace according to claim 1, which is set within a range of 10 to 50%. 4. A discharge amount of gas from the sub gas supply unit is set in a range of 10 to 60% with respect to a total discharge amount of gas from the main gas supply unit and the sub gas supply unit. The burner equipment for a heating furnace according to claim 1. 5. The main gas supply section is configured such that a supply amount of the auxiliary combustion gas to the auxiliary combustion burner is smaller than a supply amount of the main combustion gas to the main combustion burner. The burner equipment for a heating furnace according to any one of claims 4 to 4. 6. A gas supply unit for supplying a combustion gas into a furnace, and an air supply unit for supplying a combustion air to the furnace, wherein the combustion gas and the combustion air are separated from each other. A heating furnace burner device for mixing and burning in a furnace space near the gas supply unit and the air supply unit, wherein a main gas supply unit and a sub gas supply unit are provided as the gas supply unit. A main combustion burner for supplying a main combustion gas to a supply unit, and an oxygen-enriched gas is supplied to the inside of the main combustion gas, and a part of the main combustion gas is burned to form an auxiliary flame. An auxiliary burner that heats the main combustion gas, and the auxiliary gas supply unit that discharges the combustion gas into the furnace at a discharge speed lower than the discharge speed of the combustion gas from the main gas supply unit. Burner equipment for heating furnace.