JPH05607B2 - - Google Patents

Description

[Detailed description of the invention]

【0001】

[Industrial application field]

The present invention provides a mixing chamber for mixing fuel gas introduced and supplied from a gas jet hole and combustion air introduced and supplied from an opening; A mixed gas jetting port is provided for spouting out a mixed gas to burn the spouted mixed gas, and a porous member is arranged on an inner surface of a wall in the mixing chamber where the mixed gas jetting port is installed, across the mixed gas jetting port. The present invention also relates to a burner that is attached in a state that allows the mixed gas to pass through the pores.

【0002】

[Conventional technology]

Conventionally, in such a burner, a gas jet hole for introducing and supplying fuel gas into the mixing chamber and an opening for introducing and supplying combustion air into the mixing chamber are used to introduce and supply the mixed gas and combustion air from locations separated from the porous member. They were provided so as to be introduced and supplied in a direction perpendicular to the direction in which the mixed gas is ejected from the ejection port and facing each other (see, for example, Japanese Utility Model Application Publication No. 17949/1983).

【0003】

[Problem to be solved by the invention]

The conventional burner described above reduces the mixed gas ejected from the mixed gas outlet to some extent by the ejection suppressing effect of the porous member on the mixed gas, and reduces the mixed gas to some extent by the turbulence promoting effect of the porous member on the mixed gas. Stabilization of combustion is achieved by improving the mixing of fuel gas and fuel air in the gas, and by suppressing and preventing fluctuations of the combustion flame by using the porous material as a floor material for the base of the combustion flame. It is something that we try to do. However, since the fuel gas and the combustion air are simply introduced and supplied into the mixing chamber from locations spaced apart from the porous member while facing each other, the fuel gas and combustion air are insufficiently mixed in the mixing chamber. Therefore, combustion can be stabilized to some extent by the blowout suppressing effect, turbulence promoting effect, and flooring function of the porous member described above for poorly mixed mixed gas, but in high-load combustion, etc. The reality is that even higher stable combustibility is desired, and there is still room for improvement in this respect. In addition, by increasing the distance between the gas nozzle and the mixed gas nozzle in the mixing chamber and the distance between the opening and the mixed gas nozzle, the flow paths of the fuel gas and the combustion air are lengthened. We are trying to improve mutual mixing in the mixing chamber, but in this respect,
There was still room for improvement in terms of miniaturization of the burner.

[0004] The present invention was made in view of the above circumstances, and its purpose is to further improve stable combustion performance while downsizing the burner through rational and simple improvements. .

[0005]

[Means to solve the problem]

A characteristic configuration of the burner according to the present invention is that the gas injection hole is provided to introduce and supply the fuel gas in a state close to and along the porous member, and the opening is configured to introduce the combustion air into the gas injection hole. The mixed gas is introduced and supplied in a direction along the mixed gas jetting direction from the upstream side of the mixed gas spouting direction from the mixed gas jetting port with respect to the installation location, and its functions and effects are as follows. .

【0006】

[Effect]

According to the characteristic configuration described above, the fuel gas introduced and supplied from the gas injection hole to the mixing chamber is
The porous member promotes turbulence, and the mixed gas flows in a swirling state along the inner surface of the wall on the surface along the jetting direction, suppressing the flow velocity and creating a long flow path. However, by introducing and supplying combustion air to the flowing fuel gas from the opening in the direction along the mixed gas jetting direction from the upstream side of the gas jetting hole installation location in the mixed gas jetting direction, The swirling flow state in the fuel gas is further promoted. As a result, the porous member promotes turbulence of the fuel gas flowing in the mixing chamber, and the flow rate is suppressed by the swirling flow promoted by the combustion air supplied through the holes, and the flow path is reduced. Combined with the lengthening effect, the fuel gas and combustion air are effectively mixed in the mixing chamber. The porous member acts to suppress the ejection of the mixed gas from the mixed gas outlet and to promote turbulence, as well as to act as a floor material for the base of the combustion flame, in the same way as the burner with the conventional configuration described above. do.

【0007】

【Effect of the invention】

As a result of the above effects, according to the present invention, the fuel gas and combustion air in the mixing chamber can be mixed even better, although it is an extremely simple improvement in the installation of gas injection holes and openings. Therefore, compared to conventional burners, it is possible to obtain even higher stable combustion performance as a whole. In addition, by making the fuel gas flow in a swirling state in the mixing chamber,
Since the flow path is lengthened to improve the mixing of fuel gas and combustion air in the mixing chamber, the mixing chamber can be made smaller compared to conventional burners, and the entire burner can be made smaller. can do.

[0008]

【Example】

Embodiments of the burner according to the present invention will be described below with reference to the drawings.

[0009] A plurality of holes are perforated in the circumferential direction in the upper part of the case 2 forming the first air port 1 to which combustion air A is forcibly supplied at a relatively low supply pressure of about 20 mmH ₂ O by a blower (not shown) or the like. In order to form a second air port 4 that communicates through the air volume equalization holes 3 provided, an outer cylindrical body 5 with a slightly constricted tip is provided and extends through the center of the case 2. In this state, a fuel gas supply pipe 6 with a closed end to which fuel city gas G is supplied at a supply pressure of approximately 100 mmH ₂ O is installed, and a plurality of gas The gas supply pipe 6 is connected to the gas supply pipe 6 via the jet hole 7...
A cylindrical case 10 is provided which forms a mixing chamber 9 into which fuel gas is introduced and supplied from the second air port 4 and primary air for combustion is introduced and supplied from the second air port 4 through a plurality of bottom openings 8. This cylindrical case 10
A combustion cylinder 11 that opens upward is integrally connected to the tip of the cylinder.

[0010] The peripheral wall of the combustion tube 11 has a plurality of relatively large openings 12 that eject secondary air for combustion toward the inside in the radial direction, that is, in a direction substantially perpendicular to the flame ejection direction. has been formed.

[0011] The combustion section 13 inside the mixing chamber 9 and the combustion tube 11 ejects a mixed gas of the fuel gas introduced and supplied to the mixing chamber 9 and the primary air for combustion, and burns the ejected mixed gas. The spout ports 14... are separated by a plurality of partition plates 15 perforated in the circumferential direction,
A porous member 16 made of a piece of annular wire mesh
, the mixed gas outlet 1 in the mixing chamber 9
By arranging the porous member 16 in close contact with the inner surface of the wall where the mixing gas outlet 4 is installed, that is, the surface of the partition plate 15 on the side of the mixing chamber 9, the porous member 16 is connected to each of the mixed gas outlet ports 14. It is attached in a transverse state and in a state that allows the mixed gas to pass through the pores.

[0012] Further, in providing each of the gas ejection holes 7 and each of the apertures 8, each of the gas ejection holes 7 is provided so as to introduce and supply fuel gas in a state close to and along the porous member 16, Primary air for combustion is introduced and supplied through each of the openings 8 in a direction along the mixed gas jetting direction from the upstream side of the mixed gas jetting direction from the mixed gas jetting port 14 rather than the installation location of the gas jetting hole 7. It is provided.

[0013] The partition plate 15 is configured to have a substantially conical shape with its center protruding toward the combustion cylinder 11 side so that its surface on the combustion cylinder 11 side is an inclined surface.

[0014] According to the above configuration, each of the gas ejection holes 7,
The fuel gas is introduced and supplied in close proximity to and along the porous member 16, and each of the openings 8 is arranged so that the primary air for combustion is directed from the mixed gas outlet 14 rather than from the gas outlet 7 installation location. Since the fuel gas is introduced and supplied from the upstream side of the mixed gas ejection direction in a direction along the mixed gas ejection direction, the fuel gas introduced and supplied from the gas ejection holes 7 to the mixing chamber 9 is , a state in which turbulence is promoted by the porous member 16, and the flow velocity is suppressed by flowing in a swirling state along the inner wall surface on the surface along the jetting direction of the mixed gas, and the flow path becomes a long path. The swirling flow state in this fuel gas is further promoted by the primary combustion air introduced and supplied from the openings 8. As a result, the porous member 16 promotes turbulence on the fuel gas flowing in the mixing chamber 9, and the openings 8...
The fuel gas and the combustion primary air are mixed in the mixing chamber 9 by synergy with the flow velocity suppressing effect due to the swirling flow promoted by the combustion primary air supplied from ... and the flow path lengthening effect. is carried out effectively.

[0015] Also, the wire mesh as the porous member 16 is placed across each of the mixed gas jet ports 14, and
Since the holes are attached to allow the mixed gas to pass through the porous member 16, the mixed gas of the fuel gas and the primary air for combustion, which are separately introduced into the mixing chamber 9, is Due to the ejection suppressing effect, the force of ejecting from the mixed gas ejection ports 14 is reduced to some extent, and the turbulence promoting effect of the porous member 16 on the mixed gas causes the mixed gas to flow into the combustion tube 11 in an even better mixed state. The mixed gas ejected from the ejection ports 14 is further ejected and supplied from the openings 12 provided in the peripheral wall of the combustion tube 11 so that secondary air is perpendicular to the ejection direction of the mixed gas. By doing so, it mixes better with the secondary air, and in addition, the wire mesh as the porous member 16 also functions as a floor material for the root of the combustion flame.
This floor material function effectively suppresses and prevents the fluctuation of the combustion flame, and the synergistic effect of these functions significantly improves stable combustion. Furthermore, in the above embodiment,
Since the surface of the partition plate 15 on the side of the combustion tube 11 is inclined, the surroundings of each mixed gas outlet 14 are asymmetrical, and vortices are likely to be generated, so that a good flame-holding function is exhibited. . Furthermore, the air passing between the tip of the combustion tube 11 and the tip of the outer tube 5 exhibits a cooling effect on the outer tube 5 and an effect as tertiary air for combustion.

[0016] In the above embodiments, the porous member 16 is made of a single ring-shaped wire mesh, but other porous materials such as ceramic foam may be used instead of wire mesh. The porous member 16 is not limited to a single piece, and a plurality of porous members 16 may be separately attached to each of the mixed gas jet ports 14.

[0017] Furthermore, if the combustion air A that is pumped and supplied into the first air port 1 is preheated with combustion exhaust gas, or if the combustion air A is configured to be mixed with combustion exhaust gas, the combustion efficiency and NO. This is even more preferable in terms of _x reduction.

[Brief explanation of drawings]

FIG. 1 is an overall schematic vertical cross-sectional view showing one embodiment of a burner.

[Explanation of symbols]

7...Gas outlet 8...Open hole 9...Mixing room 14...Mixed gas outlet 16...Porous member.

Claims (1)

[Scope of Claims] A mixing chamber 9 for mixing fuel gas introduced and supplied from the gas ejection holes 7 and combustion air introduced and supplied from the openings 8, and the fuel gas introduced and supplied to the mixing chamber 9. A mixed gas jetting port 14 that jets out a mixed gas of the combustion air and the combustion air and burns the jetted mixed gas.
A porous member 16 is disposed on the inner surface of the wall of the mixing chamber 9 where the mixed gas outlet 14 is installed, so as to cross the mixed gas outlet 14, and the mixed gas passes through the pores. The burner is attached to the burner in such a manner as to allow the combustion air to flow through the combustion air. The burner is provided so as to be introduced and supplied in a direction along the mixed gas ejection direction from the upstream side of the mixed gas ejection direction from the mixed gas ejection port 14 than the gas ejection hole 7 installation location.