JPH0212427Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gas burner device, and more particularly, to a novel gas burner device that can stably perform high-intensity combustion with a long flame.

In the conventional gas burner of original mixing method,
The combustion air in the burner is heated by the combustion exhaust gas from the burner in order to achieve long flame and high brightness combustion. In such prior art, the air ratio M that achieves good combustion in the burner needs to be varied as shown in FIG. 1 depending on the temperature of the combustion air. Therefore, at the beginning of combustion in the burner, the temperature of the combustion air is low, resulting in an unstable combustion state.

That is, in the prior art, when supplying combustion air at a constant flow rate and constant flow rate,
Depending on the temperature, good combustion cannot always be maintained. When the temperature of the combustion air is low, the prior art requires increasing the air flow rate to increase its flow rate and thereby improve the mixing of the combustion air and gaseous fuel. However, increasing the flow rate of combustion air increases heat dissipation, making it difficult to achieve the desired high temperatures.

The inventor of this invention previously proposed a gas burner shown in FIG. 6 1. This gas burner supplies gas fuel from a gas pipe 12 provided in an outer cylinder 10, and a flame holding part 15 is provided at the front end of this gas pipe 12.
is provided, and the space 40 within the outer cylinder 10 is supplied with, for example, combustion air at room temperature. A long flame 41 can be obtained with such a gas burner device.

In such a gas burner device shown in FIG. 6, a part of the combustion air becomes a vortex near the end of the flame holding section 15 as shown by reference numeral 42, forming an air circulation section 42 with a low flow velocity. This has the advantage of creating a so-called flame-holding core and stabilizing the flame.

When this combustion air is supplied at a constant flow rate, if the temperature of the combustion air reaches a high temperature, for example 300° C., the volume and flow rate of the air will more than double.
Therefore, as shown in FIG. 6, the vortex in the air circulation section 43 becomes too large. Therefore, the amount by which the gaseous fuel supplied from the gas pipe 12 is pulled outward, that is, outward in the radial direction, increases. Therefore, the amount of gas fuel burned within the flame stabilizing section 15 becomes too large, and on the contrary, it becomes difficult to stabilize the flame within the flame stabilizing section 15, and a flame stabilizing core is not formed, resulting in failure of combustion. The problem arises that it becomes stable.

Therefore, an object of the present invention is to provide a gas burner device that can stably perform combustion with a long flame and high brightness over a wide temperature range of combustion air.

The present invention includes: (a) a right cylindrical outer cylinder 10 having a horizontally extending combustion air passage 17 and closed at a bottom portion 11a;
(b) a fan 7 that supplies combustion air at a predetermined constant air volume to the air supply hole 28 formed in the side wall near the bottom 11a of the outer cylinder 10; (c) arranged coaxially with the outer cylinder 10; (d) a right cylindrical gas pipe 12 to which gas fuel is supplied and which passes through the bottom portion 11a of the outer cylinder 10; A flame holding part 15 disposed coaxially with the cylinder 10, this flame holding part 15 is (d1) fixed to the front end of the gas pipe 12,
a disk-shaped end plate 15c perpendicular to the axis of the gas pipe 12; (d2) fixed to the outer peripheral edge of this end plate 15c;
It is formed in a hollow truncated conical shape that becomes larger in diameter toward the downstream side of the combustion air flow path 17, and the large diameter end 15d is arranged inward in the axial direction than the front end 10a of the outer cylinder 10. There are multiple connecting holes 1 at equal intervals in the circumferential direction.
5e, and this large diameter end 15d and the outer cylinder 10
forming an annular space 17b between the inner wall of the
(e) a flame stabilizing part body 15 having such a flame stabilizing part main body 15f; It extends parallel to the axis of the outer cylinder 10 from the connection hole 15e of the combustion air passage 17 toward the upstream side of the combustion air flow path 17, and the upstream end 16b is connected to the end plate 15.
(f) A plurality of right cylindrical pipes 16 located upstream of c and (f) coaxial with the outer cylinder 10 within the outer cylinder 10 and upstream of the combustion air flow path 17 than the pipes 16. arranged and freely displaceable in the axial direction of the outer cylinder 10,
(g) a ring 20 that forms an annular space 20a between it and the gas pipe 12; (h) a movable rod 18 fixed to the ring 20 at the upstream end of the combustion air passage 17, extending along the axial direction of the outer cylinder 10 and passing through the bottom 11a; i) is provided outside the outer cylinder 10 and moves the movable rod 18 in the axial direction of the outer cylinder 10 so that the stopper 21 closes the upstream end of the pipe 16 or moves away to the upstream side; This is a gas burner device characterized by including a drive source 19 for driving.

According to the present invention, as shown in FIG. 6,
Gas pipe 1 through which gas fuel is supplied into the outer cylinder 10
A flame stabilizing section 15 is attached to the front end of the gas pipe 12, and combustion air is supplied at a constant flow rate to the space 40 inside the outer cylinder 10, thus forming a long flame 44. This flame holding part 15 is provided with a pipe 16, and when the combustion air is supplied as a parallel flow, the annular space 16 is provided with a pipe 16.
A vortex flow caused by secondary air, which is combustion air, flowing through pipe 16 flows as a parallel flow through pipe 16.
The combustion air, which is the secondary air, counteracts and thus stabilizes the flame. In this way, when the temperature of the combustion air increases, the flame can be stabilized by supplying the combustion air from the pipe 16. The pipe 16 is opened and closed by a stopper 21 attached to a ring 20.

FIG. 2 is a system diagram of an embodiment of the present invention. Gaseous or liquid fuel is transferred from fuel supply 1 to burner 2
The combustion exhaust gas is supplied to pipe 3 at a constant flow rate.
from there to the heat exchanger 4 and dissipated into the atmosphere via the pipe 5. On the other hand, combustion air supplied to the burner 2 is absorbed into the heat exchanger 4 by a fan 7 from a pipe 6 leading to the atmosphere, is preheated by the heat exchanger 4, and is sent to the burner via a pipe 8. 2.
This fan 7 has a function of supplying combustion air at room temperature to the burner 2 at a constant volume.

FIG. 3 is a sectional view of the gas burner 9 according to the present invention. A cylindrical combustion chamber 11 with a bottom is formed within the outer cylinder 10, and a gas pipe 12 is provided at the center of the axis of the combustion chamber 11. One end of the gas pipe 12 (left side in FIG. 3) is connected to a gas fuel supply source 13 by passing through an insertion hole 11b in the bottom 11a of the combustion chamber 11, and a burner top 14 of the gas pipe 12 has a gas jet hole 13a. is formed. Gas vent 1
A cup-shaped flame stabilizing portion 15 having a truncated conical shape is provided on the outer peripheral side of 3a. Each end of a multi-lance-shaped pipe 16 extending in the axial direction at intervals in the circumferential direction on a virtual circumference around the axis of the gas pipe 12 is fixed to the outer peripheral inclined surface 15b of the flame stabilizing part 15. be done. Each end of the pipe 16 fixed to the flame stabilizing part 15 is cut diagonally along the outer circumferential inclined surface 15b of the flame stabilizing part 15, and the primary air flow path 16a of the pipe 16 is a gas outlet. It communicates with the combustion space facing 13a. As a result, the combustion air flow path 17 to the burner top 14 is formed between the primary air flow path 16a in each pipe 16 and the inner peripheral surface of the combustion chamber 11 and the gas pipe 12 including the gap between each pipe 16. 2
The air flow path 17a is classified into the following air flow path 17a. Both channels 1
At 6a and 17a, the primary air and the secondary air are jetted out in a flow parallel to each other.

A movable rod 18 extending in an axial direction parallel to the gas pipe 12 is arranged in the secondary air flow path 17a. One end of the moving rod 18 (left side in FIG. 3) is connected to the combustion chamber 1.
1 through the insertion hole 11c of the bottom 11a of the outer cylinder 1.
The other end of the moving rod 18 (on the right in FIG. It is fixed to the end face of a coaxially arranged ring 20. This ring 20 is attached to the gas pipe 12
The diameter is selected to be approximately the same as the virtual circle of the multi-lance pipe 16 arranged on the virtual circumference around the axis of. On the end face of the ring 20 facing the pipe 16, a plurality of plugs 21 are provided protrudingly opposite to the open ends of the pipe 16 and can be inserted into and removed from the open ends. This plug 21 can seal and open the open end of the pipe 16.

The temperature of the primary air and secondary air supplied to the burner top 14 gradually increases from the start of combustion in the gas burner 9 until reaching a steady state, causing a change in volume, and the combustion state becomes unstable. Therefore, in order to obtain optimal flow rates of primary air and secondary air, it is necessary to relatively change the flow rates of primary air and secondary air. The process of supplying primary air and secondary air to the gas burner 9 from the start of combustion to the steady state will be described below.

At the start of combustion in the gas burner 9, the ring 20 is displaced to the right in FIG. At this time, the primary air flow path 16a of the pipe 16 is connected to the plug body 2.
1. The secondary air drawn from the heat exchanger 4 by the fan 7 is supplied to the burner top 14 as shown by the arrow 30 at normal temperature and at a constant flow rate, thus at a high speed. In this way, by blocking the primary air flow path 16a of the pipe 16 with the stopper 21 of the ring 20 and increasing the flow velocity of the secondary air, the temperature of the combustion air is lowered and its volume is reduced. so that the air ratio M remains constant in the burner top 14 even when the
Secondary air is supplied, and the secondary air having a high flow rate and the gas fuel are sufficiently mixed, and it is possible to obtain a good combustion state and a long flame with high brightness.

As the temperature of the combustion air supplied from the heat exchanger 4 increases, the ring 20 is displaced by the moving rod 18 from the first position toward the second position on the left in FIG. At this time, the primary air flow path 16a of the pipe 16 is opened, and the burner top 14
Primary air is supplied to the At this time, gas pipe 1
A part of the fuel gas ejected from the burner top 14 through 2 and the secondary air ejected from the periphery of the flame stabilizing section 15 through the secondary air flow path flows back to a location along the inner circumferential slope 15a of the flame stabilizing section 15. Then, a recirculation zone is formed and stable combustion occurs partially. There, the primary air ejected from the multi-lance pipe 16 and the premixed mixed gas are combusted. At this time, the partially stable combustion flames in the recirculation zone flow parallel to each other and are mixed slowly, so a flame stabilizing effect occurs on the main combustion flame, which inevitably extends for a long time.
This allows stable combustion with a long flame and high brightness. This also results in nitrogen oxides.
There is also less NO _X generation, and low NO _X combustion is achieved.

According to the experimental results of the present inventor, in a conventional burner, as shown in Fig. 1, when the temperature of the combustion air is in the range below T1, good combustion conditions cannot be obtained unless the air ratio M is increased. I can't.
On the other hand, in the burner according to the present invention, by changing the flow velocity of the secondary air, the value of the air ratio M can be kept constant regardless of the temperature of the combustion air, as shown in Fig. 5. Therefore, a good combustion state can be obtained even from the start of combustion to a steady state.

To further describe the configuration, the outer cylinder 10 has a right cylindrical shape and has a combustion air passage 17 extending horizontally. The fan 7 supplies combustion air at a predetermined constant volume to the air supply hole 28 formed in the side wall of the outer cylinder 10 near the bottom 11a. The gas pipe 12 is arranged coaxially with the outer cylinder 10 and has a right cylindrical shape. The flame holding part 15 is a disc-shaped end plate 15.
c and a flame-holding part main body 15f, and this flame-holding part 15
is arranged within the outer cylinder 10 on the downstream side of the air supply hole 28 and coaxially with the outer cylinder 10. End plate 1
5c is fixed to the front end of the gas pipe 12 and has a disk shape perpendicular to the axis of the gas pipe 12. The flame stabilizing portion main body 15f is formed in a hollow truncated conical shape that becomes larger in diameter toward the downstream side of the combustion air flow path 17. The large-diameter end 15d of the flame stabilizing portion main body 15f is disposed further inward in the axial direction (to the left in FIG. 3) than the front end 10a of the outer cylinder 10.
An annular space 17b is formed between this large diameter end 15d and the inner wall of the outer cylinder 10. Flame holding part body 15f
has a plurality of connection holes 15e spaced at equal intervals in the circumferential direction.
has.

The plurality of right cylindrical pipes 16 are arranged in the outer cylinder 10 on the downstream side of the air supply hole 28, are fixed to the flame holding part main body 15f, and are connected to the combustion air flow path from the connection hole 15e of the flame holding part main body 15f. 17 and extends parallel to the axis of the outer cylinder 10 . This pipe 1
The upstream end 16b of 6 is located upstream of the end plate 15c.

The ring 20 is disposed within the outer cylinder 10 coaxially with the outer cylinder 10 and upstream of the combustion air passage 17 than the pipe 16 . This ring 20 is the outer cylinder 1
The gas pipe 12 is freely displaceable in the axial direction of the gas pipe 12.
An annular space 20a is formed between the two.

As described above, according to the present invention, when the temperature of the combustion air is low, the pipe 16 is closed with the stopper 21 to form the annular space between the inner wall of the outer cylinder 10 and the outer circumferential surface of the flame holding part 15. Combustion air can be supplied from 17b at a high speed, thereby making it possible to sufficiently mix the combustion air and fuel, thereby achieving good combustion conditions.

Also, when the temperature of the combustion air is high, the plug body 2
1 from the pipe 16 to reduce the flow velocity of combustion air. In this way, a stable, high-intensity, long flame can be obtained. Therefore, in the present invention, as shown in FIG. 5, the air ratio can be kept almost constant regardless of the temperature of the combustion air. Therefore, even if the temperature of the combustion air is low, there is no need to increase the flow rate of the combustion air, as described in connection with the prior art, and heat dissipation can be suppressed, and high temperatures can be suppressed. can be achieved.

Furthermore, according to the present invention, the flame holding part 15 is fixed to the front end of the gas pipe 12 and
A combustion air flow path 1 fixed to the outer peripheral edge of the end plate 15c perpendicular to the axis of the combustion air flow path 15c.
It has a flame stabilizing part main body 15f formed in a hollow truncated cone shape that becomes larger in diameter toward the downstream side of the pipe 16, and when combustion air that is primary air flows through the pipe 16, the primary air The air and the gas fuel from the gas pipe 12 are properly mixed, which helps to stably form a long flame.

Further, in the present invention, the ring 20 is coaxial with the outer cylinder 10 and forms an annular space 20a between the ring 20 and the gas pipe 12, so that the plug body 21 is spaced apart from the pipe 16 to allow combustion air to flow into the gas pipe 16. When flowing in, through this annular space 20a,
Combustion air flows, and this ring 20 and outer cylinder 1
Since the combustion air flows through the space between the pipe 16 and the inner wall of the pipe 16, it is possible to flow the combustion air in parallel to the pipe 16 as much as possible. Therefore, it is certain that the excessive vortex caused by the combustion air, which is secondary air, flowing through the annular space 17b formed between the large-diameter end 15d of the flame-holding section main body 15f and the inner wall of the outer cylinder 10 can be canceled out. This makes it possible to stabilize flame holding.

Further, according to the present invention, the front end portion 10 of the outer cylinder 10
Since the large-diameter end portion 15d of the flame-holding portion main body 15f is disposed axially inward from point a, a long flame can be stably formed.

[Brief explanation of the drawing]

Fig. 1 is a graph for explaining the prior art, Fig. 2 is a system diagram of an embodiment of the present invention, Fig. 3 is a cross-sectional view of the gas burner 9, and Fig. 4 is taken from the cutting plane line - of Fig. 3. The cross-sectional view shown in Figure 5 shows primary air and secondary air.
FIG. 6 is a graph showing the relationship between the air ratio M of secondary air and the temperature T of combustion air, and FIG. 6 is a diagram showing the basic technology of the present invention and the present invention in a simplified manner. 2, 9... Gas burner, 14... Burner top, 16a... Primary air flow path, 17a... Secondary air flow path, 18... Moving rod, 20... Ring.

Claims (1)

[Claims for Utility Model Registration] (a) A right cylindrical outer cylinder 10 having a horizontally extending combustion air passage 17 and closed at the bottom 11a.
(b) a fan 7 that supplies combustion air at a predetermined constant air volume to the air supply hole 28 formed in the side wall near the bottom 11a of the outer cylinder 10; (c) arranged coaxially with the outer cylinder 10; (d) a right cylindrical gas pipe 12 to which gas fuel is supplied and which passes through the bottom portion 11a of the outer cylinder 10; A flame holding part 15 disposed coaxially with the cylinder 10, this flame holding part 15 is (d1) fixed to the front end of the gas pipe 12,
a disk-shaped end plate 15c perpendicular to the axis of the gas pipe 12; (d2) fixed to the outer peripheral edge of this end plate 15c;
It is formed in a hollow truncated conical shape that becomes larger in diameter toward the downstream side of the combustion air flow path 17, and the large diameter end 15d is arranged inward in the axial direction than the front end 10a of the outer cylinder 10. There are multiple connecting holes 1 at equal intervals in the circumferential direction.
5e, and this large diameter end 15d and the outer cylinder 10
forming an annular space 17b between the inner wall of the
(e) a flame stabilizing part 15 having such a flame stabilizing part main body 15f;
It extends parallel to the axis of the outer cylinder 10 from the connection hole 15e of the flame stabilizing part main body 15f toward the upstream side of the combustion air flow path 17, and the upstream end 16b is connected to the end plate 1.
(f) A plurality of such right cylindrical pipes 16 located upstream of the pipe 5c, and (f) coaxial with the outer cylinder 10 within the outer cylinder 10 and located upstream of the combustion air flow path 17 from the pipe 16. arranged and freely displaceable in the axial direction of the outer cylinder 10,
(g) a ring 20 that forms an annular space 20a between it and the gas pipe 12; (h) a movable rod 18 fixed to the ring 20 at the upstream end of the combustion air flow path 17, extending along the axial direction of the outer cylinder 10 and passing through the bottom portion 11a; i) is provided outside the outer cylinder 10 and moves the movable rod 18 in the axial direction of the outer cylinder 10 so that the stopper 21 closes the upstream end of the pipe 16 or moves away to the upstream side; A gas burner device characterized in that it includes a drive source 19 for driving.