JP4758202B2 - Oil burner for cremation furnace - Google Patents

Description

  The present invention relates to an oil burner that is used by being attached to a cremation furnace, and is used while tilting the tip of the burner (moving up and down).

  In the case of a cremation furnace, as is apparent from Patent Document 1 (Japanese Patent Laid-Open No. 2002-333112), the tip of the burner for fuel combustion is attached to the main heat chamber so as to be tiltable. In addition, since the burner is required to be able to arbitrarily adjust the heating power, a gas burner that is easier to use than an oil burner is used more frequently. However, this gas burner has the drawback of high fuel costs.

  For this reason, oil burners that use kerosene with low fuel costs have come to be used recently, even though they are somewhat inconvenient, but there are no dedicated oil burners for cremation furnaces. Therefore, the general-purpose type is used.

  For example, Patent Document 2 (Japanese Patent Laid-Open No. 7-004619) discloses that "means 22 for supplying fuel to be sprayed, means for spraying fuel when the fuel flows along the central axis" 24, means 26 for discharging the sprayed fuel into a conical shape that expands, and a boundary fluid cooling ring of spray fluid flows concentrically with the central axis near the conical discharge shape, to suppress such a conical shape The fuel delivery mechanism 20 including means 16, 26, 60, 50 for cooling the outlet end of the mechanism, and supplying the oxidant to the outlet end of the fuel mechanism and the expansion of the sprayed fuel released A structure comprising a means 92, 94, 19, 50 for forming a combustible oxidizer bag around a conical shape and mixing with the fuel to provide a combustible mixture and a desired flame ".

  Patent Document 3 (Japanese Patent Application Laid-Open No. 2001-141210) states that “a first primary air outlet 50 and a first primary air outlet 50 are surrounded by a tip surface of an oil burner. An annular fuel jet 70 and a second primary air jet 80 surrounding the fuel jet 70 are formed, and the fuel jetted from the fuel jet 70 in a ring shape (cylindrical shape) “A structure in which both the inner and outer surfaces of the ring are in contact with the primary air jets ejected from the first and second primary air jets 50 and 80 and are finely sheared and sufficiently atomized”.

  In addition, an atomizer having a structure as shown in FIG. 9 is usually used for an oil burner often used in a cremation furnace. The atomizer 1 has a fuel injection passage 2 formed at the center thereof, a fuel injection nozzle 4 having a fuel injection outlet 3 formed at the tip of the fuel injection passage 2, and a combustion air supply passage outside the nozzle 4. 5, a combustion air jet port 6 is formed around the fuel jet port 3 formed at the tip of the nozzle 4, and a swirl vane 7 is incorporated in the combustion air supply channel 5. In addition, illustration of a burner outer cylinder etc. is abbreviate | omitted in FIG.

However, the oil burner using the atomizer 1 shown in FIG. 9 has the following drawbacks.
1. The oil burner for the cremation furnace is attached to the jig on the furnace wall so that it can be used by shifting the flame direction (angle) from horizontal to downward as described in Patent Document 1, but in the case of an oil burner When the angle of the burner is shifted from the downward direction to the upward direction, the liquid level may fluctuate in the fuel supply passage 2 in the atomizer 1 and the liquid may run out. In this state, the liquid is not completely drained, but the ratio of the liquid volume to the air volume changes, so that the flame becomes unstable, and this tendency is particularly noticeable during low load combustion.
2. In the case of a cremation furnace burner, a variety of flames are required, from sharp to soft, but it is difficult to meet such demands.
3. A wide range of turndown ratios is required depending on the conditions in the cremation furnace, but this is also difficult.
4). Carbon is generated and attached to the head of the atomizer 1 and the like, and it is often necessary to remove it.

A first object of the present invention is to provide an oil burner for a cremation furnace that can prevent instability of a flame caused by liquid level fluctuation that occurs when the burner is tilted.
Furthermore, the second object of the present invention is to provide an oil burner for a cremation furnace that can freely adjust a flame from a sharp one to a soft one.
A third object of the present invention is to provide an oil burner for a cremation furnace having a wide turn-down ratio according to the situation in the furnace.
A fourth object of the present invention is to provide a cremation oil burner in which carbon does not adhere to the head or the like of an atomizer.

  In order to achieve the above object, according to the first aspect of the present invention, in the oil burner for a cremation furnace, an orifice for preventing a backflow of fuel is incorporated in a fuel supply flow path leading to a fuel jet formed at the tip of the atomizer. Thus, it is configured to suppress the fluctuation of the liquid level in the fuel supply channel when the burner is tilted and to stabilize the flame.

Furthermore, in the invention according to claim 2, in the oil burner for a cremation furnace according to claim 1, the orifice is incorporated in one stage or two stages with a predetermined interval and in two stages. In the case of a fixed orifice, a through hole is formed in the center of the upper orifice located on the fuel supply side, and a plurality of through holes are formed on the circumference of the lower orifice located downstream of the upper orifice. It is characterized by being.
According to the present invention, since the liquid level does not change when the burner is tilted, the flame is stabilized.

Furthermore, in the invention according to claim 3, in the oil burner for a cremation furnace according to claim 1, a flame holder whose diameter is slightly enlarged is attached to a tip portion of the atomizer. A plurality of air ejection holes are formed in a portion where the head of the atomizer is located, and a secondary air ejection port is formed at the tip of the flame holder between the outer diameter portion of the flame holder A flame holding cylinder is attached, and a burner outer cylinder is attached to the outside of the atomizer so as to form a secondary air supply channel communicating with the air ejection hole and the secondary air ejection port, A flame holding outer cylinder that includes the flame holding cylinder portion and extends forward is attached to the tip of the burner outer cylinder.
According to the present invention, a sharp and stable straight flame can be formed.

Furthermore, in the invention according to claim 4, in the oil burner for a cremation furnace according to claim 3, the swirl vanes are attached to the combustion air supply flow path and the secondary air outlet in the atomizer. It is a feature.
This invention improves thermal efficiency and enables fuel savings.

  Furthermore, in the invention according to claim 5, in the oil burner for a cremation furnace according to claim 3, a spark plug is caused to face the flame holding cylinder, and the spark plug is activated to perform direct ignition. It is characterized by comprising.

  Furthermore, in the invention according to claim 6, in the oil burner for a cremation furnace according to claim 3, a flange is formed on the outer periphery of the tip of the flame holding cylinder, and the flange and the flame holding outer cylinder A tertiary air jet port communicating with the secondary air supply path is formed therebetween.

[Action]
For example, kerosene, which is a pressurized fuel, moves forward in the fuel supply flow path, and first passes through the central through hole at the upper orifice and collides with the center of the lower orifice, then diffuses and then forms in the lower orifice. The gas passes through the plurality of through holes and flows downstream, and is ejected from the fuel ejection port. At the same time, the combustion air moves forward in the combustion air supply flow path, is turbulent by the swirler blades, and is ejected from the combustion air outlet, thereby atomizing the fuel in the flame holding cylinder while atomizing the fuel. Mix with.
The air-fuel mixture is ignited by a spark plug in the flame holding cylinder and fixed to the tip of the flame holding cylinder.

Further, the pressurized secondary air supplied from the secondary air flow path is ejected from the secondary air outlet into the flame-holding cylinder, and is ejected to the fixing portion of the above-described flame to enable complete combustion.
The flame formed in this way is constrained by the flame-holding outer cylinder formed at the tip of the burner outer cylinder and goes straight, and becomes a straight and sharp flame and is ejected into the furnace.
Further, from the air ejection hole formed in the flame holder, a part of the secondary air blows vigorously on the head of the atomizer, and the carbons adhering to the head of the atomizer are scattered.
Further, the tertiary air ejected from the tertiary air ejection port urges the flame, and at the same time, the carbon adhering to the inside of the flame holding outer cylinder is scattered to reduce the burden of cleaning.

The cremation oil burner is tilted during use. For example, even if the orientation of the burner changes from downward to horizontal or upward, the orifice exists in the fuel supply flow path. Is blocked. As a result, the liquid level on the downstream side (fuel outlet side) of the orifice is stabilized, so that a stable flame can be maintained at all times.
Further, since secondary air is supplied into the flame holding cylinder, the air is sufficiently supplied to the fixing portion of the flame, and the flame is further stabilized. Moreover, since the swirl flow of the secondary air creates a swirl flow of air around the flame, the flame increases its speed and becomes a more straight-forward flame.

The present invention has the following effects by the configuration and operation as described above.
1. The orifice suppresses changes in the liquid level when the burner is tilted, so that it is possible to prevent the flame from becoming unstable, especially at low loads.
2. Since the flame can be stabilized from a sharp flame to a soft flame, it can be used according to the cremation conditions.
3. It can be used in a wide range of turn-down ratios due to the flame stabilization effect.
4). Since a part of the secondary air is blown to the head of the atomizer, it is possible to prevent carbon from adhering to the head of the atomizer. As a result, maintenance costs and labor are reduced.

An embodiment of the present invention will be described in detail with reference to FIGS.
FIG. 1 is an explanatory view of a state in which an oil burner according to the present invention is attached to a cremation furnace, FIG. 2 is a sectional view showing the entire oil burner, FIG. 3 is a sectional view of a burner head portion, FIG. 4 is a sectional view of an atomizer, 5 (A) to (C) are explanatory diagrams of the former orifice, FIGS. 6 (A) to (C) are explanatory diagrams of the latter orifice, FIG. 7 is a sectional view taken along line AA ′ in FIG. 2, and FIG. FIG. 4 is a cross-sectional view taken along line BB ′ in FIG.
In FIG. 1, 50 is a cremation furnace, 51 is a main combustion chamber, 52 is a carriage, 54 is an oil burner mounting jig, and the oil burner A according to the present invention has a structure of the main combustion chamber 51 by the jig 54. It is attached to the rear wall 53 so as to be tiltable. 56 is a front door of the main combustion chamber 51, and 57 is a flue that continues from the main combustion chamber 51.

In each said figure, the structure of the atomizer 1 of the oil burner A which concerns on this invention is the same structure as the atomizer 1 demonstrated in FIG.
As shown in FIG. 4, the difference is that when the oil burner A is tilted, the front orifice 20 and the rear orifice in the fuel supply passage 2 are prevented in order to prevent the liquid level in the fuel supply passage 2 from fluctuating. 22 is incorporated. As shown in FIGS. 5A to 5C, the front orifice 20 is provided with a through hole 21 having an inlet 21 a having a large diameter and an outlet 21 b having a small diameter at the center thereof. As shown in FIGS. 6 (A) to 6 (C), the inlet 23a has a large diameter, and the outlet side is formed with a plurality of small holes 23b.
The shape of the through holes 21 and 23 may be circular or slit. The opening area of the through holes 20 and 21 is effectively set as the rear orifice 22> the front orifice 20, but the opposite or the same. However, practical use is not denied. Further, only one stage of orifice may be used, and these selections are determined by the size of the oil burner and the like.

Further, the difference in the present invention is that a cup-shaped flame holder 24 is attached to the tip of the atomizer 1 as shown in FIG. 2 and FIG. An air ejection hole 25 is formed at a position facing the head 1a. Further, a flame holding cylinder 27 is attached to the tip of the flame holder 24 by forming a secondary air jet 26 between the outer diameter portion of the tip of the flame holder 24. Reference numeral 28 denotes a folded hook portion formed on the outer periphery of the tip of the flame holding cylinder 27, and communicated with the secondary air supply passage 29 between the outer circumference of the flange portion 28 and a flame holding outer cylinder 31 described later. A tertiary air jet outlet 28a is formed.
Further, a burner outer cylinder 30 is attached to the outside of the atomizer 1 so as to open a secondary air supply passage 29 following the secondary air outlet 26, and at the tip of the burner outer cylinder 30, A flame holding outer cylinder 31 is attached so as to include the flame holding cylinder.

32 is a swirl vane incorporated in the secondary air outlet 26, 33 is a fuel supply pipe, 34 is a combustion air supply port for supplying combustion air into the atomizer 1, and 35 is via a secondary air supply channel 29. And a secondary air supply port for supplying secondary air to the secondary air outlet 26.
An ignition plug 36 is installed so as to slightly protrude from the secondary air outlet 26 into the flame holding cylinder 27. The ignition plug 36 is sparked when a high voltage is applied from an ignition transformer (not shown). The air-fuel mixture is ignited in the flame holding cylinder 27.

Next, the usage example of the oil burner A of an Example is demonstrated. As shown in FIG. 1, the oil burner A is used by being attached to the rear wall 53 of the cremation furnace 50 using a jig 54.
For example, kerosene, which is a pressurized fuel, is supplied from the fuel supply pipe 33, and the supplied fuel advances in the fuel supply flow path 2 of the atomizer 1, passes through the through hole of the upstream orifice 21, After being opened in 2 a and colliding with the center of the rear orifice 22, it passes through the surrounding through-hole 23 and is ejected from the fuel ejection port 3 into the flame holder 24. At the same time, the pressurized combustion air is supplied from the combustion air supply port 34, advances in the combustion air supply flow path 5, and is ejected from the combustion air outlet 6 of the atomizer 1 to be mixed with the fuel. To do.
This air-fuel mixture is forward of the atomizer 1, moves from the flame holder 24 into the flame holding cylinder 27, is ignited by the spark plug 36, and this flame is fixed at the tip of the flame holding cylinder 27.

Further, the pressurized secondary air supplied from the secondary air supply port 35 into the secondary air supply flow path 29 becomes a swirl flow by the action of the swirl vanes 32 from the secondary air outlet 26, and the flame holding cylinder 27. Flame B (see Fig. 1) that blows into the flame and supplies the secondary air necessary for efficient combustion against the flame, and constrains the surroundings of the flame by the action of swirling flow. ).
The flame B formed in this way is further restrained by the flame-holding outer cylinder 31 at the tip of the burner outer cylinder 30 and travels farther straight, and becomes a straight flame B that is jetted into the main combustion chamber 51. .
Moreover, from the air ejection hole 25 formed in the flame holder 24, a part of secondary air blows vigorously on the head 1a at the tip of the atomizer 1 to prevent carbon from adhering to the head 1a.
Further, the tertiary air is supplied from the tertiary air ejection port 28 a along the inner surface of the flame-holding outer cylinder 31 to urge the flame B, and at the same time, carbons adhering to the inner surface of the flame-holding outer cylinder 31 are blown off.

The oil burner A is tilted during use, but the liquid level in the fuel supply passage 2 is restricted by the orifices 20 and 22 and the backflow is prevented. , 22 hardly changes, and even if it fluctuates, the fluctuation range of the air-to-air ratio is small and a stable flame B can always be maintained.
In the flame holding cylinder 27, the flame B is further stabilized by the supply of secondary air. At this time, by making the secondary air into a swirl flow by the swirl vanes 32, mixing of the flame B and air is further promoted in the flame holding cylinder 27 and the flame holding outer cylinder 31, and complete combustion is performed. A stable flame B can be formed from a flame to a soft flame. In addition, combustion with a wide range of turndown ratios is possible.

Explanatory drawing of the cremation furnace which attached the oil burner concerning the present invention Sectional view of an oil burner according to the present invention Cross section of burner head Cross section of atomizer (A)-(C) Explanatory drawing of the former stage orifice (A)-(C) Explanatory drawing of latter stage orifice AA 'line sectional view BB 'sectional view Illustration of a conventional oil burner

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Nozzle 2 Fuel flow path 3 Fuel jet nozzle 4 Fuel injection nozzle 5 Combustion air supply flow path 6 Combustion air jet outlet 20 Front stage orifice 21 Rear stage orifice 24 Flame holder 27 Flame holding cylinder 30 Burner outer cylinder 31 Flame holding outer cylinder

Claims (6)

  Incorporating an orifice for preventing fuel backflow into the fuel supply flow path leading to the fuel injection port formed at the tip of the atomizer prevents the liquid level in the fuel supply flow path from changing when the burner tilts and stabilizes the flame An oil burner for a cremation furnace that is configured to achieve this.   The orifice is incorporated in one stage or two stages with a certain interval, and in the case of an orifice incorporated in two stages, a through hole is formed in the center of the upper stage orifice located on the fuel supply side. 2. The oil burner for a cremation furnace according to claim 1, wherein a plurality of through holes are formed on a circumferential line in the lower orifice located downstream of the upper orifice. 3.   A flame holder having a slightly enlarged diameter at the tip side is attached to the tip portion of the atomizer, and in this flame holder, a plurality of air ejection holes are formed in a portion where the head of the atomizer is located, and the flame holder A flame holding cylinder is attached to the tip of the flame holder so as to form a secondary air jet port between the outer diameter portion of the tip of the flame holder, and further, the air jet hole and the second pipe are provided outside the atomizer. A burner outer cylinder is attached so as to form a secondary air supply channel communicating with the secondary air outlet, and the flame holding cylinder portion is included at the front end of the burner outer cylinder and extended forward. The oil burner for a cremation furnace according to claim 1, wherein a flame outer cylinder is attached.   The oil burner for a cremation furnace according to claim 3, wherein swirl vanes are attached to the combustion air supply flow path and the secondary air jet outlet in the atomizer.   The oil burner for a cremation furnace according to claim 3, wherein a spark plug is exposed in the flame holding cylinder, and the ignition plug is activated to perform direct ignition. 4. A flange portion is formed on the outer periphery of the tip of the flame-holding cylinder, and a tertiary air jet port communicating with the secondary air supply path is formed between the flange portion and the flame-holding outer cylinder. An oil burner for a cremation furnace as described in 1.

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