JP2777106B2 - Burner tileless gas burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a burner tileless gas burner, that is, a gas burner not using a burner tile.

[0002]

2. Description of the Related Art Conventionally, gas burners have burner tiles for the purpose of maintaining stable combustion. However, the burner tile is heavy because of the refractory structure, and the burner is attached to the furnace wall,
Not only took time for maintenance such as removal in case of damage, but also required careful handling. Further, at the time of combustion, the temperature of the burner tile becomes high, and the temperature around the burner becomes high due to the heat transfer, so that not only heat radiation loss becomes large, but also there is a risk that an operator may be burned. Furthermore, in the conventional burner, a swirl vane was attached to the combustion air supply pipe to form a swirl flow in order to supply the combustion air by spiral rotation, but the installation of the swirl vane is very troublesome and production is difficult. There is a problem that the property is poor. Furthermore, gas burners are required to have high, medium, and low flame jet velocities depending on the purpose of use.However, conventional gas burners require various gas burners, which increases costs. Had the problem of becoming

Accordingly, in order to solve the above-mentioned problems, the present invention secures combustion stabilization without using burner tiles, forms a swirling flow without using swirling vanes, and further replaces parts. High speed, medium speed,
It is an object to provide a burner tileless gas burner that can be a low-speed gas burner.

[0004]

According to the present invention, there is provided a combustion air supply pipe having a circular inner surface provided with a swirling air supply port for supplying combustion air in a tangential direction at a rear portion thereof. A fuel gas supply pipe disposed at the center of the combustion air supply pipe and having a plurality of straight gas injection ports at the tip and a plurality of radial gas injection ports at the outer peripheral surface near the tip, and the radial gas of the fuel gas supply pipe; It is provided near the back of the spout,
A stabilizer having a plurality of through holes parallel to the combustion air supply pipe, a spark plug protruding forward of the stabilizer, and a diameter of the stabilizer which is exchangeably attached to a tip end of the combustion air supply pipe. And a combustor having a larger inner diameter.

[0005]

Next, an embodiment of the present invention will be described with reference to the drawings. The burner tileless gas burner A according to the present invention generally includes a combustion air supply pipe 1, a fuel gas supply pipe 5 disposed in the combustion air supply pipe 1,
It comprises a stabilizer (flame holding plate) 10, a spark plug 12, and a combustor (combustion cylinder) 15 which is interchangeably attached to the tip of the combustion air supply pipe 1.

The combustion air supply pipe 1 has a supply path 2 having a circular inner surface, a rear end portion of which is closed by a face plate 1a, and which opens in a tangential direction of the supply path 2 as shown in FIG. It has a combustion air supply port 3.

The fuel gas supply pipe 5 is disposed at the center of the combustion air supply pipe 1. As shown in FIGS. 3 and 4, a straight gas injection hole 6 is shown at the tip end surface. Although not shown, a plurality of radial gas injection holes 7 are provided on the outer circumferential surface slightly behind (outside of the furnace) slightly behind the straight gas injection holes 6. The rear end of the fuel gas supply pipe 5 is connected via a limiting orifice 8 to a fuel gas supply port 9 provided in the face plate 1a.

As shown in FIGS. 3 and 4, the stabilizer 10 is provided with a radial gas injection hole 7 of the fuel gas supply pipe 5.
It is composed of a disk attached slightly to the rear and has a plurality of through holes 11 on the same circumference.

The spark plug 12 has a rear end penetrating outward from the face plate 1a and a front end held and attached by the stabilizer 10. The front end 13 of the plug is slightly in front of the stabilizer 10 (inside the furnace). It is protruding.

The combustor 15 is replaceably attached to the end of the combustion air supply pipe 1 by a chuck nut 17 via a packing (not shown). The shape of the combustor 15 is as shown in FIG.
Select according to the required flame jet speed, such as for high-speed use with a high degree of throttle at the leading end outlet 16, medium-speed use with a small degree of throttle (FIG. 5), or low-speed use with a small degree of throttle (FIG. 6). The material is made of heat-resistant metal at low furnace temperature (up to 700 ° C) and high furnace temperature (up to 700-1300 ° C).
Is made of ceramic. And, there is an interval α between the inner peripheral surface of the combustor 15 and the outer periphery of the stabilizer 10 through which a swirling flow of combustion air, which will be described later, passes.

In the gas burner having the above construction, for example, a high-speed combustor 15 is attached to the tip of the combustion air supply pipe 1 by a chuck nut 17, and this burner is attached to the furnace wall T.
And the flange portion 4 is mounted on the furnace wall T with mounting bolts (not shown) or the like. When the combustion air is supplied from the combustion air supply port 3, the combustion air is supplied in a tangential direction to the supply passage 2, so that the combustion air forms a swirling flow in the supply passage 2 as shown in FIG. 1. A part of the combustion air passes outside the stabilizer 10 (interval α) and moves forward in a swirling flow state, and the other part of the combustion air is blocked once by the stabilizer 10 and passes straight through a plurality of through holes 11. . Therefore, a vortex is generated near the front surface (furnace inside) of the stabilizer 10 to form a negative pressure portion.

On the other hand, the pressure of the fuel gas supplied from the fuel gas supply port 9 is adjusted by the limiting orifice 8, and a part of the fuel gas is supplied to the straight gas injection hole 6 provided at the end face of the fuel gas supply pipe 5. , And jets straight from the radial gas jetting holes 7 into the vicinity of the front surface of the stabilizer 10 (negative pressure portion). The fuel gas ejected from the radial gas ejection holes 7 is sufficiently mixed with the combustion air by the vortex generated near the front surface of the stabilizer 10 described above. Further, the fuel gas ejected from the straight gas ejection holes 6 is sufficiently mixed inside the combustor 15 by the swirling flow and the straight flow of the combustion air. In this state, the burner is ignited by operating the ignition plug 12 to form a spark at the plug tip 13.
Then, the flame burned inside the combustor 15 is ejected from the ejection hole 16 into the furnace at a high speed. At this time, the combustor 15 is heated by the above-described combustion flame. However, the temperature can be suppressed low because the swirling flow of the combustion air exists on the inner peripheral surface of the combustor 15.

Further, a negative pressure portion is always formed near the front surface of the stabilizer 10 by the combustion air.
In this negative pressure section, a pilot flame is formed by the fuel gas from the radial ejection holes 7. In the above-described embodiment, the combustor 15 is used for high-speed operation in which the amount of throttle of the ejection hole 16 is large. In this case, however, low-NOx combustion can be achieved by incorporating exhaust gas in the furnace by a high-speed jet of flame.

The switching from the high-speed burner to the medium-speed or low-speed burner is performed by replacing the combustor 15. In addition, the change from reduction combustion to excess air combustion requires rapid mixing of combustion air and fuel gas in reduction combustion.
The supply of combustion air is reduced while the supply of fuel gas is kept constant.On the other hand, in the case of excess air combustion, it is necessary to mix the combustion air and fuel gas slowly. This is performed by reducing the supply of the fuel gas while keeping the constant.

[0015]

As is apparent from the above description, according to the gas burner of the present invention, the combustion air is turned into a swirl flow and a straight flow, and the fuel gas is made into a radial and straight flow. The flame function can be ensured and the structure is simple and lightweight because of the use of a combustor, and it can be easily attached to and removed from the furnace wall. Further, in order to make the combustion air a swirling flow, the structure is further simplified by changing the position of the air supply port instead of the conventional swirling blade. Further, since the combustor is replaceable, the flame speed can be changed as needed, and it is not necessary to prepare a burner corresponding to the flame speed, so that the cost is low. Moreover, the inner peripheral surface of the combustor is cooled in contact with the swirling flow of the combustion air, so that its life can be extended. Furthermore, as described above, while the temperature of the combustor is kept low, the burner nozzle is located inside the furnace, and the combustion is performed inside the furnace, the temperature of the burner body becomes low, and the heat loss from the burner body is reduced. This has the effect of saving energy and improving the working environment.

[Brief description of the drawings]

FIG. 1 is a sectional view of a burner tileless gas burner according to the present invention.

FIG. 2 is a sectional view taken along line II-II of only a main part of FIG.

FIG. 3 is an enlarged sectional view related to a main part of FIG. 1;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a sectional view of a medium-speed combustor.

FIG. 6 is a sectional view of a low-speed combustor.

[Explanation of symbols]

A: Burner tileless gas burner, B: Burner mounting hole,
T: furnace wall, 1 ... combustion air supply pipe, 2 ... supply path, 3 ... supply port, 5 ... fuel gas supply pipe, 6, 7 ... gas ejection hole, 10
... Stabilizer, 11 ... Through hole, 12 ... Spark plug, 1
5: Combustor, 16: Spout, 17: Chuck nut.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-285220 (JP, A) JP-A-7-27306 (JP, A) Jiko 6-16265 (JP, Y2) Jiko 39- 25078 (JP, Y1) (58) Fields investigated (Int. Cl. ⁶ , DB name) F23D 14/24 F23D 14/22

Claims (1)

(57) [Claims] 1. A combustion air supply pipe having a circular inner surface provided at a rear portion thereof with a swirling air supply port for supplying combustion air in a tangential direction, and disposed at the center of the combustion air supply pipe. A fuel gas supply pipe having a plurality of radial gas injection ports on an outer peripheral surface near the gas injection port and the tip, respectively, and a fuel gas supply pipe provided behind the radial gas injection port near the fuel gas supply pipe;
A stabilizer having a plurality of through holes parallel to the combustion air supply pipe, a spark plug protruding forward of the stabilizer, and a diameter of the stabilizer which is exchangeably attached to a tip end of the combustion air supply pipe. A burner tileless gas burner comprising a combustor having a larger inner diameter.