JPH1078203A - Oxygen burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mix a fuel gas which is injected into a furnace from a burner nozzle with an oxygen gas rapidly and satisfactorily, and change a high temperature combustion range easily. SOLUTION: A burner nozzle 1 is formed with an inner and outer double cylinder where a fuel gas is supplied to a fuel gas passage 3 in the inner cylinder 2 of the burner nozzle 1 while an oxygen gas is supplied to an oxygen passage 5 between the inner cylinder 2 and outer cylinder 4 in the nozzle 1. The outer peripheral surface 2a at the tip of the inner cylinder 2 is formed in tapered shape while the inner peripheral surface 4a at the tip of the outer cylinder 4 is formed in tapered shape. This construction makes it possible to eject the oxygen gas from the tip of the oxygen passage 5 toward the fuel gas ejected into a furnace 20 from the tip of the fuel gas passage 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an oxygen burner used for a melting furnace, an incinerator and the like.

[0002]

2. Description of the Related Art Conventionally, in an oxygen burner used for a melting furnace or an incinerator, a fuel gas and an oxygen gas are ejected into the furnace from the tip of a burner nozzle, so that the fuel gas and the oxygen gas are separated. It burns in the furnace.

As this type of oxygen burner, there is one in which a burner nozzle is formed by a straight inner and outer double cylinder. That is,
The oxygen burner passes the fuel gas through the inner cylinder of the burner nozzle and ejects the oxygen gas into the furnace from the opening at the tip of the inner cylinder of the burner nozzle. The burner nozzle is blown into the furnace through an opening at the tip of the outer cylinder of the burner nozzle.

[0004]

However, in the above-described conventional oxygen burner, both the fuel gas and the oxygen gas straightly travel through the burner nozzle and are ejected from the opening at the tip of the burner nozzle directly into the furnace. Are mixed with each other by diffusion at

[0005] For this reason, the fuel gas and the oxygen gas ejected into the furnace cannot be mixed quickly and sufficiently, so that sufficient combustion cannot be obtained. In addition, since the fuel gas and the oxygen gas are not sufficiently mixed, a part of the fuel gas may be wastefully discharged from the furnace without being used for combustion.

Further, in the above-described conventional oxygen burner, it was difficult to change the high temperature range of combustion in the furnace. The present invention can quickly and sufficiently mix the fuel gas and the oxygen gas ejected from the burner nozzle into the furnace.
An object of the present invention is to make it possible to easily change a high temperature range of combustion.

[0007]

According to the first aspect of the present invention, the following object is achieved, for example, as shown in FIGS. 1 to 3, in order to achieve the above object.

The burner nozzle (1) is formed by an inner and outer double cylinder,
The inside of the inner cylinder (2) of the burner nozzle (1) is formed as a fuel gas passage (3) to supply fuel gas to the fuel gas passage (3), and the inner cylinder (2) of the burner nozzle (1) is connected to the outer cylinder. By forming a space between the cylinder (4) and the oxygen passage (5) and supplying oxygen gas to the oxygen passage (5), each of the fuel gas passage (3) and the oxygen passage (5) is separated. In an oxygen burner configured to eject a fuel gas and an oxygen gas from a tip respectively, an outer peripheral surface (2a) of a tip portion of the inner cylinder (2) is formed into a tapered tapered shape, and the outer cylinder is formed. Inner peripheral surface (4a) at the tip of (4)
Is formed in a tapered shape corresponding to the outer peripheral surface (2a) of the inner cylinder (2).

According to the second aspect of the present invention, the first aspect is provided.
In addition to the configuration of the present invention, the following configuration is provided. That is, at least one of the outer peripheral surface (2a) of the inner cylinder (2) and the inner peripheral surface (4a) of the outer cylinder (4) has the oxygen gas at the tapered tip of the oxygen passage (5). A groove (6) extending toward the tip end of the burner nozzle (1) is provided in a state inclined with respect to the flow direction.

[0010]

The invention of claim 1 operates as follows, for example, as shown in FIG. Fuel gas is burner nozzle
The fuel gas passes through the fuel gas passage (3) in the inner cylinder (2) in (1) and is jetted from the tip of the fuel gas passage (3) toward the inside of the furnace (20).

On the other hand, the oxygen gas flows through the oxygen passage (5) between the inner cylinder (2) and the outer cylinder (4) of the burner nozzle (1), and flows to the tip side of the oxygen passage (5). As shown in FIG. 1, since the tip of the oxygen passage (5) is tapered toward the fuel gas passage (3), the tip of the oxygen passage (5) flows to the tip of the oxygen passage (5). Oxygen gas passed through the fuel gas passage
Guided to the side.

Then, the oxygen gas flows into the fuel gas passage.
The fuel gas is ejected from the tip of the oxygen passage (5) toward the fuel gas ejected into the furnace (20) from the tip of (3). Thereby, the fuel gas is forcibly stirred by the oxygen gas, and the oxygen gas and the fuel gas are mixed strongly.

Further, the invention of claim 2 is, for example, shown in FIG.
3 operates as follows, as shown in FIG. That is, part of the oxygen gas flowing at the tip of the oxygen passage (5) flows through the groove (6) at the tip of the oxygen passage (5), so that the tapered oxygen gas is It is guided in a direction inclined with respect to the flow direction, and flows while turning in the oxygen passage (5).

The oxygen gas is ejected from the tip of the fuel gas passage (3) into the furnace (20) while rotating around the ejected fuel gas. As a result, the oxygen gas collides with the fuel gas ejected into the furnace (20) while swirling a part of the fuel gas. As a result, the fuel gas is more forcibly stirred by the oxygen gas, and Oxygen gas and fuel gas are mixed more strongly.

[0015]

According to the first aspect of the present invention, the following effects can be obtained from the configuration and operation described above. Since the oxygen gas collides with the fuel gas ejected from the burner nozzle into the furnace, the fuel gas is forcibly stirred by the oxygen gas,
The oxygen gas and the fuel gas are mixed strongly. Therefore, the fuel gas and the oxygen gas can be quickly and sufficiently mixed and burned even at a location close to the burner nozzle, and the fuel gas and the oxygen gas ejected into the furnace can be used for combustion without waste. As a result, efficient combustion can be performed.

Further, the high temperature range of combustion can be changed only by changing the flow rate of the oxygen gas injected from the burner nozzle into the furnace. That is, when the flow rate of the oxygen gas is reduced, a high-temperature region of combustion can be formed at a location near the burner nozzle, while when the flow rate of the oxygen gas is increased, the combustion can be performed at a location relatively far from the burner nozzle. High temperature region can be formed.

According to the second aspect of the present invention, since it is configured and operates as described above, the following effects are further obtained in addition to the above effects. Since the oxygen gas collides with the fuel gas ejected into the furnace while swirling a part thereof, the oxygen gas and the fuel gas can be mixed more strongly. Therefore, the fuel gas and the oxygen gas can be used for combustion without waste, and the combustion can be performed more efficiently.

The angle of the tapered slope at the tip of the oxygen passage is changed, the angle of the slope of the groove at the tip of the oxygen passage relative to the flow direction of the oxygen gas is changed, or the slope of the groove is changed. It is also possible to change the high temperature range of combustion by changing the width or depth.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an oxygen burner according to the present invention will be described below with reference to FIGS. 1 is a longitudinal sectional view of the oxygen burner, FIG. 2 is a view of the inner cylinder of the oxygen burner as viewed from the tip side, and FIG. 3 is III-I of FIG.
FIG.

In the oxygen burner, the burner nozzle (1) is formed by an inner and outer double cylinder. As shown in FIG. 1, the tip end surface (left side in FIG. 1) of the burner nozzle (1) is connected to a melting furnace or the like. It is mounted so as to be flush with the inner surface of the furnace wall (21) such as an incinerator. The tip of the burner nozzle (1) is connected to the furnace wall.
(21) It may be mounted in a slightly retracted state.

That is, the inner cylinder (2) of the burner nozzle (1)
The inside is formed as a fuel gas passage (3), and the space between the inner cylinder (2) and the outer cylinder (4) of the burner nozzle (1) is formed as an oxygen passage.
Formed in (5). And those fuel gas passages
(3) and the end of the oxygen passage (5) are communicated with the inside of the furnace (20).

The fuel gas passage (3) is connected to a fuel gas supply source (not shown), and the oxygen passage (5) is connected to an oxygen supply source (not shown). A flammable gas such as liquefied petroleum gas or liquefied natural gas is used as the fuel gas.

Next, the structure of the tip of the inner cylinder (2) and the outer cylinder (4) of the burner nozzle (1) will be described. The tip of the inner cylinder (2) of the burner nozzle (1) has an outer peripheral surface (2a) formed in a conical shape (tapered shape) with a tapered conical surface, and the outer cylinder (4) of the burner nozzle (1) is formed. The tip of () has an inner peripheral surface (4a) formed in a tapered conical surface (tapered shape) so as to correspond to the outer peripheral surface (2a) of the inner cylinder (2). As a result, the tip of the oxygen passage (5) is tapered toward the fuel gas passage (3).

The inner peripheral surface (2b) at the tip of the inner cylinder (2) of the burner nozzle (1) is formed to have a conical surface (tapered shape).
The fuel gas is rapidly diffused in the furnace (20). Further, the distal end surface of the inner cylinder (2) is slightly retracted into the oxygen passage (5), and the mixing of the fuel gas and the oxygen gas near the distal end portion of the burner nozzle (1) is performed quickly. .

On the outer peripheral surface (2a) of the inner cylinder (2), the flow direction of oxygen gas at the tapered tip of the oxygen passage (5)
A groove (6) extending toward the tip end of the burner nozzle (1) is provided in a state inclined with respect to the left and right direction in FIG.

As shown in FIGS. 2 and 3, eight grooves (6) are provided on the outer peripheral surface (2a) of the inner cylinder (2).
(6) extends linearly on the outer peripheral surface (2a) of the inner cylinder (2). Then, a part of the oxygen gas flows in the tip of the oxygen passage (5) while swirling by flowing through the groove (6).

The number of grooves (6) provided on the outer peripheral surface (2a) of the inner cylinder (2) is not limited to eight, but may be nine or more, or seven or less. Good. further,
The width and depth of each groove (6) are set according to the flow rate and flow rate of oxygen gas. Further, the sectional area of the side wall (6a) of each groove (6) at the tip of the inner cylinder (2) may be made equal to the sectional area of each groove (6).

Next, the operation of the oxygen burner will be described. That is, the fuel gas is ejected through the fuel gas passage (3) while spreading from the opening at the end of the fuel gas passage (3) toward the inside of the furnace (20).

On the other hand, the oxygen gas flows toward the fuel gas passage (3) by flowing through the tip of the oxygen passage (5). Also, a part of the oxygen gas is supplied to the groove at the tip of the oxygen passage (5).
By flowing through (6), it flows while turning at the tip of the oxygen passage (5).

Then, the oxygen gas is ejected from the tip of the oxygen passage (5) toward the fuel gas ejected into the furnace (20), and part of the oxygen gas is centered on the ejected fuel gas. While squirting toward the fuel gas.

As a result, the oxygen gas collides with the fuel gas ejected into the furnace (20) while swirling a part thereof,
As a result, the fuel gas is forcibly stirred by the oxygen gas, and the oxygen gas and the fuel gas are strongly mixed.

As described above, the fuel gas and the oxygen gas ejected from the burner nozzle (1) are rapidly and sufficiently mixed, so that the oxygen gas and the fuel gas are sufficiently mixed even at a location near the burner nozzle (1). Being burned. In addition, the fuel gas and the oxygen gas can be used for combustion without waste, and efficient combustion can be performed.

Hereinafter, the effect of the present invention will be described based on the experimental results shown in FIG. In the experimental results shown in FIG. 4, the flow rate of the fuel gas was fixed at 28 m / sec, and the flow rate of the oxygen gas and the width of the groove (6) were changed to change the temperature measurement points (A to G).
Was measured. Also, the outer cylinder of the burner nozzle (1)
The inner peripheral surface (4a) of (4) and the outer peripheral surface (2a) of the inner cylinder (2) are each formed in a tapered shape inclined at about 15 °. The flow rate ratio indicates the ratio of the flow rate of oxygen gas to the flow rate of fuel gas (oxygen gas flow rate / fuel gas flow rate).

As shown in FIGS. 5 and 6, the temperature measurement points (A to C) are 300 mm above the center axis (L) of the fuel gas ejected from the burner nozzle (1) (in FIG. 5, Upper side)
Then, forward from the tip of the burner nozzle (1) 500mm · 10
They are set at positions separated by 00 mm and 1500 mm, respectively. The temperature measurement points (D to F) are 200 mm laterally (upper in FIG. 6) from the central axis (L), and the burner nozzle
500mm ・ 1000mm ・ 1500 from the tip of (1) forward
It is set at a position separated by mm. In addition, the temperature measurement point
(G) is set at a position 1600 mm away from the tip of the burner nozzle (1) forward on the central axis (L).

According to the experimental results shown in FIG.
In the conventional oxygen burner, that is, in the case where the fuel gas and the oxygen gas go straight through the burner nozzle and squirt into the furnace (20) from the opening at the tip of the burner nozzle (data), the oxygen gas flow rate is increased. Nevertheless, the temperature at the temperature measurement point (G) in front of the burner nozzle (1) is lower than that of the oxygen burner of the present invention (data ~). That is, in the conventional oxygen burner, even if the flow rate of the oxygen gas is increased, a portion relatively far from the tip of the burner nozzle cannot be sufficiently heated.

On the other hand, in the oxygen burner of the present invention, the temperature at the temperature measurement point (G) increases as the flow rate of the oxygen gas increases (in the order of data, data and data). This shows that if the gas flow rate is increased, it is possible to sufficiently heat even a portion relatively far from the tip of the burner nozzle (1).

Moreover, as the flow rate of the oxygen gas increases,
While the temperature at the temperature measurement point (G) is high,
The temperature at the temperature measurement point (D) is low, which indicates that the higher the flow rate of the oxygen gas, the higher the temperature range of the combustion moves to the front of the burner nozzle (1).

A groove (6) is formed on the outer peripheral surface (2a) of the inner cylinder (2).
The temperature at the temperature measurement point (E · F) is higher in the case where the gas is provided (data and data) than in the case where the groove (6) is not provided (data) even if the flow rate of the oxygen gas is equal. This indicates that the oxygen gas and the fuel gas were mixed more strongly and completely burned by the action of the groove (6).

Moreover, as the groove width is larger, the temperature measurement point (E
・ The temperature in F) is high (data> data)
This indicates that the larger the groove width, the more strongly the oxygen gas and the fuel gas were mixed and more completely burned.

In the above description, the burner nozzle
The groove (6) is provided on the outer peripheral surface (2a) of the tip of the inner cylinder (2) of (1), but instead of this, the inner peripheral surface (4a) of the tip of the outer cylinder (4) has A groove (6) may be provided. Further, an outer peripheral surface (2a) of a tip portion of the inner cylinder (2) and an inner peripheral surface (4a) of a tip portion of the outer cylinder (4).
May be provided with the groove (6).

[Brief description of the drawings]

FIG. 1 shows an embodiment of an oxygen burner according to the present invention, and is a longitudinal sectional view of the oxygen burner.

FIG. 2 is a view of the inner cylinder of the oxygen burner as viewed from the front end side.

FIG. 3 is a view taken along line III-III in FIG. 2;

FIG. 4 is a data diagram showing a result of a combustion experiment using the oxygen burner.

FIG. 5 is a side view of each temperature measurement point in a combustion experiment using the oxygen burner.

FIG. 6 is a diagram showing each temperature measurement point in a combustion experiment using the oxygen burner as viewed from above.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Burner nozzle, 2 ... Inner cylinder of burner nozzle, 2a ... Outer peripheral surface of the tip of inner cylinder, 3 ... Fuel gas passage, 4 ... Outer cylinder of burner nozzle, 4a ... Inner peripheral surface of tip of outer cylinder, 5 ... Oxygen aisle,
6 ... groove.

Claims (2)

[Claims] A burner nozzle (1) is formed of an inner and outer double cylinder, and a fuel gas passage is formed in an inner cylinder (2) of the burner nozzle (1).
(3), the fuel gas is supplied to the fuel gas passage (3), and the space between the inner cylinder (2) and the outer cylinder (4) of the burner nozzle (1) is formed in the oxygen passage (5). ), And the oxygen gas is supplied to the oxygen passage (5), whereby the fuel gas and the oxygen gas are respectively ejected from the respective ends of the fuel gas passage (3) and the oxygen passage (5). In the oxygen burner thus configured, the outer peripheral surface (2a) of the distal end of the inner cylinder (2) is formed in a tapered shape with a taper, and the inner peripheral surface (4a) of the distal end of the outer cylinder (4) is formed.
An oxygen burner characterized in that a) is formed in a tapered shape so as to correspond to the outer peripheral surface (2a) of the inner cylinder (2). 2. The oxygen burner according to claim 1, wherein an outer peripheral surface (2a) of the inner cylinder (2) and an inner peripheral surface (4) of the outer cylinder (4).
a) a groove (6) extending to the tip side of the burner nozzle (1) in a state inclined with respect to the flow direction of oxygen gas at the tapered tip of the oxygen passage (5). An oxygen burner, characterized in that: