JPS636568Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a burner for burning liquid fuel, which is of a type in which liquid fuel and combustion-assisting gas are separately supplied to a combustion chamber and are mixed and combusted in the combustion chamber. The present invention relates to a burner that promotes atomization of liquid fuel to achieve more complete combustion, and that prevents combustion particles or carbon from adhering to a nozzle during combustion.

[Conventional technology]

Generally, this type of liquid fuel burner has a combustion chamber surrounded by a water-cooled or air-cooled jacket at its tip, and the liquid fuel flows from approximately the center of the combustion chamber and from the surrounding area near the jacket. The mechanism is such that auxiliary combustion gas is ejected, and the ejected liquid fuel is mixed with the auxiliary gas near the wall of the combustion chamber and combusted.

[Problem that the invention attempts to solve]

However, the conventional burner described above has various disadvantages. For example, because the two nozzles are far apart and mixing is incomplete, some of the atomized fine particles of the liquid fuel do not burn and come into contact with the inner wall of the combustion chamber, recombining and becoming coarse or droplets. Adheres as combustible material. In addition, if the ejected liquid fuel is not atomized completely and flies out of the flame without being completely mixed with combustion supporting gas such as air or oxygen, incomplete combustion will occur and soot will be produced. Furthermore, the lack of auxiliary combustion gas in the vicinity of the liquid fuel nozzle causes carbon to adhere to the vicinity of the nozzle, causing nozzle blockage.

The present invention improves the drawbacks of conventional burners and promotes atomization of atomized liquid fuel by allowing a part of combustion assisting gas such as air, oxygen, or oxygen-enriched air to flow near the liquid fuel nozzle. It is an object of the present invention to provide a burner which has complete mixing with auxiliary combustion gas and completely eliminates the adhesion of carbon during combustion.

[Means for solving problems]

In order to achieve the above object, the present invention disposes a combustion auxiliary gas supply path forming body having a combustion auxiliary gas flow path around the outer periphery of a liquid fuel supply conduit having a fuel injection hole at its tip, and the auxiliary combustion gas supply path forming body has a combustion auxiliary gas flow path. A water-cooled or air-cooled jacket is disposed around the outer periphery of the jacket so that a combustion chamber is formed by the inner wall of the tip end of the jacket and the end face of the auxiliary gas supply passage forming body, and the liquid fuel and auxiliary gas are supplied from the fuel injection hole. A liquid fuel combustion burner in which auxiliary combustion gases are individually injected into combustion chambers through flow paths, mixed and combusted, wherein the tip of the liquid fuel supply conduit is a truncated conical part, and a truncated conical part is formed in the center thereof. A fuel injection hole is provided inside the truncated conical part,
A liquid fuel supply conduit that houses a swirler provided with grooves that give the liquid fuel a swirl in the same direction or in the opposite direction to the swirling direction of the ejected auxiliary gas, and into which a part of the auxiliary gas flowing through the auxiliary gas flow path is branched. An auxiliary gas supply path forming body is provided with a combustion auxiliary gas branch flow path so as to flow in a tangential direction to the auxiliary gas supply path forming body, and a gap formed by the truncated conical portion and the auxiliary gas supply path forming body is formed into an annular truncated conical shape for the auxiliary gas. a flow path, and a jet port of the tangential auxiliary combustion gas branch flow path is provided in the gap, and the auxiliary gas flowing through the gap swirls and flows around the outer periphery of the liquid fuel supply conduit, and from the outer periphery of the fuel jet hole. The liquid fuel supply conduit is configured so as to be injected into the combustion chamber, and the liquid fuel supply conduit is configured to be able to slide or rotate with respect to the auxiliary combustion gas flow path forming body provided on the outer periphery of the liquid fuel supply conduit, and the auxiliary gas flow path The present invention is characterized in that the passage width of the ejection part of the combustion auxiliary gas branch passage formed by the forming body and the outer circumference of the liquid fuel supply conduit can be adjusted.

〔Example〕

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a side sectional view of the tip of a burner according to the present invention, and FIG. 2 is a front view thereof. In the figure, a liquid fuel supply conduit 1 is disposed at the center of the burner, a truncated conical part 2 is formed at the tip of the conduit 1, and a liquid fuel injection hole 3 is provided at the center of the trapezoidal top of the truncated conical part 2. ing. A swirler 4 for swirling the liquid fuel 1 is housed inside the truncated conical portion 2, and the liquid fuel 1 swirled by the swirler 4 is spouted out in a conical shape at a predetermined angle and atomized. This swirler 4 is provided with a groove, which allows the liquid fuel l introduced from the right side in FIG.
generates swirling, but the swirling direction may be the same direction as or opposite to the swirling direction of the auxiliary gas g, which will be described later, and which direction is determined as appropriate depending on the type of liquid fuel, etc.

An auxiliary combustion gas supply path forming body 5 is disposed on the outer periphery of the liquid fuel supply conduit 1, and a portion of the outer periphery of the supply path forming body 5 that contacts the water cooling jacket 6 on the outside is filled with auxiliary combustion gas g such as air or oxygen. A supply passage 7 is formed by a plurality of spiral grooves, and opens into a combustion chamber 12 formed by an end face 8 and an inner wall of the tip of the water cooling jacket 6. The supply channel 7 for the combustion auxiliary gas g branches in front of the end surface 8 of the combustion auxiliary gas supply channel forming body 5 (Fig. 3), and is perpendicular to the axis and tangentially to the liquid fuel supply conduit 1 (fourth direction). A plurality of flow channels 9 are provided in the figure). This auxiliary gas branch supply flow path 9 opens into a gap formed by the truncated conical portion 2 of the liquid fuel supply conduit 1 and the auxiliary gas supply path forming body 5, that is, into an annular truncated conical flow path 10 for auxiliary gas. Therefore, the auxiliary gas _g1 , which is supplied from the right side in FIG. An annular truncated conical channel opening 11 opened in the end surface 8 of the auxiliary combustion gas supply channel forming body 5
It ejects in a manner that converges towards the central axis. The ejected auxiliary combustion gas _g1 is mixed with the liquid fuel l sprayed from the liquid fuel injection hole 3 in the combustion chamber 12 formed by the end face 8 and the water-cooled jacket 6, and combusted.
At this time, the auxiliary combustion gas _g1 is ejected so as to converge on the central axis as described above, so that it mixes very well with the ejected liquid fuel l, and further completely atomizes the liquid fuel l. In addition, since the auxiliary combustion gas _g1 is sufficiently supplied to the liquid fuel l in the vicinity of the ejection hole 3, the liquid fuel l does not become unburned or carbonized. Therefore, inconveniences such as clogging of the ejection holes 3 do not occur. On the other hand, the auxiliary combustion gas g that has proceeded without branching through the auxiliary combustion gas supply channel 7 is ejected so as to surround the flame from the outside (the first
g ₂ ) in the figure, oxygen is supplied from the outside to the flame in which the atomized liquid fuel l and the auxiliary combustion gas g ₁ are already mixed and combusted to complete combustion. In this way, in this burner, the supplied auxiliary gas g is divided into two parts, and the auxiliary gas g ₁ is ejected to converge on the central axis, and the auxiliary gas g ₂ is ejected to surround the flame. Since it is a mixed reaction, combustion takes place completely.

Next, the combustion auxiliary gas supply flow path 7 provided in the combustion auxiliary gas supply path forming body 5 is provided by providing a spiral groove on the outer peripheral surface of the supply path forming body 5 as described above, as well as by the following method. I can do it. That is, a plurality of linear grooves are provided on the outer peripheral surface of the supply path forming body 5 (FIGS. 5 and 6), and a plurality of linear perforations are provided circularly around the central axis of the supply path forming body 5. Similarly, the combustion gas supply path can be formed by providing a plurality of spiral perforations in a circular manner around the central axis (FIGS. 7 and 8).

Since the way the flame is formed differs depending on the type of liquid fuel l and the type of auxiliary combustion gas g, the best one is determined by considering these combinations.

In addition, the supply amount of the auxiliary gas g jetted out from the annular truncated conical flow path opening 11 via the auxiliary gas branch supply channel 9 and its ejection speed are determined by the nature of the flame (acidic flame, neutral flame, reducing flame) and the fuel. It may be necessary to make adjustments depending on the type of liquid fuel, such as the degree of carbon precipitation near the nozzle orifice. In such a case, the burner of the present invention can be provided with a mechanism that can adjust the size (gap interval) of the annular truncated conical flow path 10 for combustion auxiliary gas. FIG. 10 is a detailed diagram thereof. That is, the positions of the liquid fuel supply conduit 1 and the combustion auxiliary gas supply path forming body 5 are adjusted and fixed with screws 13, and further fixed in position with cap nuts 14. At this time, the gasket 15 and the O-ring 16 seal the auxiliary combustion gas g flowing back from the annular truncated conical flow path 10 for the auxiliary gas.

On the other hand, there are cases where the supply amount of the auxiliary combustion gas g jetted out from the annular truncated conical flow path opening 11 and its jetting speed are fixed values and there is no need to adjust them.
In such a case, the mutual positional relationship between the liquid fuel supply conduit 1 and the combustion auxiliary gas supply path forming body 5 may remain fixed, so the truncated conical portion 2 of the liquid fuel supply conduit 1, which is the tip of the liquid fuel supply conduit 1, No. 9 on the outer peripheral surface of
As shown in the figure, a spiral groove 17 is provided to serve as a passage for the auxiliary combustion gas g. As a result, the auxiliary gas annular truncated conical flow path 10 becomes a fixed spiral groove flow path.

[Effect of idea]

The structure of the burner of the present invention is constructed as described above, and its characteristic effects are as follows.

By branching the auxiliary gas flow path and providing one of its jet holes near the liquid fuel nozzle, the auxiliary gas is spouted out in a manner that swirls and converges toward the central axis. The atomization of the liquid fuel is promoted and the combustion is more complete. This also prevents the generation of unburned matter and carbon in the vicinity of the liquid fuel nozzle, thereby making it possible to prevent clogging. The other branched auxiliary gas is ejected from a position slightly away from the liquid fuel nozzle to envelop the flame, so oxygen is supplied from the outside to the flame caused by the already well-mixed liquid fuel and auxiliary gas, further promoting combustion. make it complete. With such a mechanism, the burner of the present invention can completely burn liquid fuel stably for a long period of time without increasing the amount of auxiliary combustion gas and without generating unburned matter or carbon.

Furthermore, when it is necessary to adjust the flow rate and outflow speed of the auxiliary gas, a mechanism that can adjust this is provided, and conversely, when there is no need to adjust the flow rate and outflow speed of the auxiliary gas, the flow path of the auxiliary gas is fixed. The mechanism can be selected depending on the purpose in each case.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of the tip of the burner according to the present invention, FIG. 2 is a front view thereof, and FIGS. 3 to 8 show respective embodiments of the auxiliary gas supply path forming body. 4 is a sectional view taken along the line A-A in FIG. 3, FIG. 5 is a half sectional side view of another embodiment, and FIG. 6 is a front view of FIG. 7 is a side view in half section of still another embodiment, FIG. 8 is a front view of FIG. FIG. 10 is a side sectional view of a burner tip according to still another embodiment of the present invention. 1... Fluid fuel supply conduit, 2... truncated conical part,
3...Liquid fuel nozzle, 4...Swirler, 5...
Combustion auxiliary gas supply path forming body, 6...cold water jacket,
7... Combustion assisting gas supply channel, 8... End face of the forming body 5, 9... Combustion assisting gas branch supply channel, 10... Annular truncated conical channel for combustion assisting gas, 11... Said channel 10
opening, 12...combustion chamber, 13...screw, 14...
... Cap nut, 15 ... Packing, 16 ... O-ring, 17 ... Spiral groove.

Claims (1)

[Scope of utility model registration request] A combustion auxiliary gas supply path forming body 5 having a combustion auxiliary gas flow path is disposed on the outer periphery of the liquid fuel supply conduit 1 having a fuel injection hole 3 at the tip, and a water cooling or air cooling is provided on the outer periphery of the combustion auxiliary gas supply path forming body 5. The jacket 6 is disposed so that a combustion chamber 12 is formed by the inner wall of the tip end of the jacket 6 and the end surface 8 of the auxiliary gas supply path forming body 5, and liquid fuel and auxiliary gas are supplied from the fuel injection hole 3. This is a liquid fuel combustion burner in which auxiliary combustion gases are individually injected into combustion chambers 12 through flow paths, mixed and combusted, and the tip of the liquid fuel supply conduit 1 is formed into a truncated conical part 2. A fuel injection hole 3 is provided in the center, and inside the truncated conical part 2,
A swirler 4 provided with a groove that gives the liquid fuel a swirl in the same direction or in the opposite direction to the swirling direction of the ejected auxiliary gas is housed, and a part of the auxiliary gas flowing through the auxiliary gas flow path is branched to form the liquid fuel. A combustion auxiliary gas branch flow path 9 is provided in the combustion auxiliary gas supply path forming body 5 so as to flow in a tangential direction with respect to the supply conduit 1, and a gap is formed between the truncated conical portion 2 and the combustion auxiliary gas supply path forming body 5. The auxiliary gas flow path 10 is an annular truncated conical flow path 10 for auxiliary gas, and the ejection port of the tangential auxiliary gas branch flow path 9 is provided in the gap, and the auxiliary gas flowing through the gap swirls to form the liquid fuel supply conduit 1.
A burner for liquid fuel, characterized in that the liquid fuel flows around the outer periphery of the liquid fuel and is ejected from the outer periphery of the fuel injection hole 3 into the combustion chamber 12.