JP2014070777A - Boiler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boiler capable of suppressing drift of air supplied from a lower part of a burner.SOLUTION: A boiler 1 includes a cylindrical can body 10 extended in a vertical direction; a burner 20 arranged on a lower part of the can body 10 and configured to eject fuel gas upward; a combustion cylinder arranged on the outside of the burner 20 and covering a periphery of the burner; a plurality of through holes 31 formed on a peripheral surface of the combustion cylinder 30; and an air introduction port 51 arranged on the side of the combustion cylinder 30. The burner 20 includes: a lid part 23 arranged on the lower part of the can body 10 to cover the lower part of the can body 10; a tubular nozzle part 21 extended upward through the lid part 23; a burner head 22 attached to an upper end part of the nozzle part 21 and having a shape diameter-expanded upward; and a plurality of through holes 22a formed on the burner head 22.

Description

  The present invention relates to a boiler. More specifically, the present invention relates to a boiler including a can body and a burner disposed at a lower portion of the can body.

  2. Description of the Related Art Conventionally, there has been known a boiler including a cylindrical can body in which a plurality of water pipes are disposed and a burner disposed in the inside of the can body. In such a boiler, fuel gas serving as fuel is ejected from the burner and air is supplied from the outside of the burner to mix and burn the air and the fuel gas. And by the combustion of fuel gas, the water supplied to the inside of a some water pipe is heated, and a vapor | steam is produced | generated.

  In such a boiler, a technique for arranging a combustion cylinder around the burner and rectifying the air supplied to the burner by introducing air into the combustion cylinder to improve the combustibility of the fuel gas Has been proposed (see, for example, Patent Document 1).

  There has also been proposed a boiler in which a burner is disposed at the lower part of a can body and air is introduced from below the burner to burn fuel gas (for example, see Patent Document 2).

JP 2007-71527 A JP-A-9-292105

  By the way, in the boiler which has arrange | positioned the burner in the lower part of a can body, it is necessary to eject fuel gas and air toward the upper direction of a can body. However, when the burner is arranged at the lower part of the can in this way, the air supplied to the burner is likely to drift, and even if a combustion cylinder is simply arranged around the burner, the air supplied to the burner is sufficient. May not be rectified.

  Accordingly, an object of the present invention is to provide a boiler that can prevent the occurrence of drift in the air supplied to the burner.

  The present invention includes a cylindrical can body extending in the vertical direction, a burner disposed below the can body and ejecting fuel gas upward, and a combustion disposed outside the burner and covering the periphery of the burner The present invention relates to a boiler including a cylinder, a plurality of through holes formed in a peripheral surface of the combustion cylinder, and an air introduction port arranged on a side of the combustion cylinder.

  Further, the burner is provided at a lower end of the can body, a lid portion that closes the lower portion of the can body, a tubular nozzle portion that penetrates the lid portion and extends upward, and an upper end portion of the nozzle portion, It is preferable to include a burner head having a shape whose diameter is increased upward, and a plurality of through holes formed in the burner head.

  Moreover, it is preferable that the lower end part of the said combustion cylinder is joined to the said cover part, and the upper end part of this combustion cylinder is located above the upper end part of the said burner.

  In addition, a spark rod disposed between the burner and the combustion cylinder, and a flame rod are further provided, and a leading end portion of the spark rod and a leading end portion of the flame rod are formed through the burner head. It is preferably inserted into the burner from the hole.

  Further, it is preferable that the plurality of through holes are formed over the entire circumference of the lower region on the circumferential surface of the combustion cylinder.

  ADVANTAGE OF THE INVENTION According to this invention, the boiler which can suppress the drift of the air supplied from the downward direction of a burner can be provided.

It is the schematic which shows the boiler which concerns on one Embodiment of this invention. It is a figure which shows the vicinity of the burner part of the boiler of this invention. It is a top view of the burner shown in FIG.

Hereinafter, a preferred embodiment of the boiler of the present invention will be described with reference to the drawings.
First, with reference to FIG. 1, the whole structure of the boiler 1 of this embodiment is demonstrated.
The boiler 1 of the present embodiment includes a can 10, a burner 20, a combustion cylinder 30, a blower 40, a wind box 50, an air inlet 51, a spark rod 60, a flame rod 70, and an exhaust cylinder 80. And comprising.

The can body 10 includes a cylindrical main body 11, a plurality of water pipes 12, a lower header 13, an upper header 14, and casters 15.
The main body 11 is formed in a cylindrical shape extending in the vertical direction.
The plurality of water pipes 12 are arranged inside the main body 11 so as to be annularly arranged in a top view so as to follow the inner peripheral surface of the main body 11. The plurality of water pipes 12 are arranged extending in the vertical direction with a predetermined interval. Water is supplied from the lower header 13 into the plurality of water pipes 12.

  The lower header 13 is disposed below the plurality of water pipes 12 and connected to the lower parts of the plurality of water pipes 12. Water is supplied to the lower header 13 from a water supply pipe (not shown), and water is supplied from the lower header 13 to the plurality of water tubes 12.

  The upper header 14 is disposed above the plurality of water tubes 12 and is connected to the upper portions of the plurality of water tubes 12. Steam generated in the plurality of water pipes 12 gathers in the upper header 14. The steam collected in the upper header 14 is supplied to the outside through a steam outlet (not shown).

  The caster 15 is configured in a plate shape by a member having fire resistance such as concrete. The caster 15 is disposed inside the plurality of water pipes 12 arranged in an annular shape, and is fixed to the plurality of water pipes 12. The caster 15 shields the flow of the combustion gas flowing from below to above slightly above the central portion of the can body 10 in the height direction.

  As shown in FIGS. 2 and 3, the burner 20 includes a nozzle portion 21, a burner head 22, and a lid portion 23. The burner 20 is disposed at the lower part of the can 10. The burner 20 is composed of a heat-resistant member, and ejects a fuel gas serving as fuel upward and supplies it to the inside of the can body 10.

  The nozzle part 21 is formed in a tubular shape and is arranged so as to extend in the vertical direction. The lower end of the nozzle portion 21 is connected to a fuel gas supply pipe (not shown).

  The burner head 22 is connected to the upper end portion of the nozzle portion 21. The burner head 22 has a shape whose diameter is increased upward. A plurality of through holes 22 a are formed on the side surface of the burner head 22.

  The lid portion 23 is formed in a disk shape and is disposed at the lower portion of the can body 10. The lid part 23 is arranged in a substantially horizontal direction. A through hole (not shown) is formed in a substantially central part of the lid part 23, and the nozzle part 21 is inserted into the through hole. The lid 23 closes the lower part of the can body 10, thereby closing the space where the combustion gas flows from the burner 20 to the inside of the can body 10.

The combustion cylinder 30 is disposed outside the burner 20 and covers the periphery of the burner 20. The lower end portion of the combustion cylinder 30 is connected to the lid portion 23 of the burner 20, and the upper end portion thereof is located above the upper end portion of the burner 20.
A plurality of through holes 31 are formed on the peripheral surface of the combustion cylinder 30. In the present embodiment, the plurality of through holes 31 are formed at substantially equal intervals over the entire circumference of the lower region of the combustion cylinder 30. The region where the plurality of through holes 31 are formed is preferably in a range from 40 mm to 80 mm from the lower end of the combustion cylinder 30 from the viewpoint of suitably sending air into the combustion cylinder 30.

  The area | region in which the several through-holes 31 in the above combustion cylinder 30 are not formed is formed by shape | molding the plate-shaped member which consists of metal which has heat resistance, such as stainless steel, in a cylinder shape. Moreover, the area | region in which the some through-hole 31 in the combustion cylinder 30 was formed is formed by shape | molding punching metal in a cylinder shape. And these two members are connected by welding etc. and the combustion cylinder 30 of this embodiment is comprised.

  The blower 40 is disposed on the side of the lower portion of the combustion cylinder 30. The blower 40 supplies air to the combustion cylinder 30 through an air supply path 42 that extends toward the lower end of the combustion cylinder 30. The blower 40 adjusts the amount of air to be supplied by opening and closing a damper 41 disposed in the air supply path 42.

The wind box 50 covers the lower part of the combustion cylinder 30 and the lid part 23. An opening is formed in the side surface of the wind box 50, and an air supply path 42 extending from the blower 40 is connected to the opening. The wind box 50 prevents the air supplied from the blower 40 from diffusing around the combustion cylinder 30.
The air introduction port 51 is configured by an opening on the side surface of the wind box 50. The air inlet 51 is disposed on the side of the combustion cylinder 30.

  The spark rod 60 extends from below the boiler 1 and is disposed between the burner 20 and the combustion cylinder 30. The tip of the spark rod 60 is inserted into the burner 20 through the plurality of through holes 22 a in the burner head 22. The spark rod 60 is an ignition device that ignites the fuel gas ejected from the burner 20.

  The flame rod 70 extends from below the boiler 1 and is disposed between the burner 20 and the combustion cylinder 30. The distal end portion of the flame rod 70 is inserted into the burner 20 through a plurality of through holes 22 a in the burner head 22. The flame rod 70 detects whether or not a flame is generated from the burner 20.

  The exhaust tube 80 is disposed on the upper portion of the can body 10. The exhaust cylinder 80 is a flow path for discharging the combustion gas flowing through the inside of the can body 10 to the outside of the can body 10.

Next, a specific operation of the boiler 1 of the present embodiment will be described.
In the boiler 1 of the present embodiment, the air sent from the blower 40 is supplied from the side of the combustion cylinder 30 and flows into the combustion cylinder 30 from a plurality of through holes 31 provided in the lower part of the combustion cylinder 30. . The air flowing into the combustion cylinder 30 is mixed with the fuel gas supplied from the burner 20 and burned.

  In more detail, in this embodiment, the air blower 40 is arrange | positioned at the lower part of the boiler 1, and supplies air toward the air inlet 51 provided in the side of the combustion cylinder 30 in the wind box 50. As shown in FIG. Since the lower end portion of the combustion cylinder 30 is closed by the lid portion 23 provided on the burner 20, a plurality of air introduced from the air introduction port 51 is provided in the lower peripheral surface of the combustion cylinder 30. It flows from the hole 31 into the combustion cylinder 30. Here, in the present embodiment, since the plurality of through holes 31 are formed over the entire circumference of a predetermined region below the combustion cylinder 30, the air is supplied from the side of the combustion cylinder 30. Even if it exists, the rectified air flows into the combustion cylinder 30.

Next, the air that has flowed into the combustion cylinder 30 in a rectified state is supplied upward by the inner wall surface of the combustion cylinder 30, and the inside of the burner head 22 from the plurality of through holes 22 a formed in the burner head 22. Flow into.
On the other hand, the burner 20 is disposed inside the combustion cylinder 30, and the fuel gas flows through the nozzle portion 21 of the burner 20 and is ejected from the burner head 22.
Then, the fuel gas ejected from the burner head 22 and the fuel gas supplied to the upper portion of the combustion cylinder 30 are mixed at the upper part of the combustion cylinder 30, and the mixed gas is ignited by the spark rod 60 and burned. .

  Next, the combustion gas generated by burning the fuel gas in the upper part of the combustion cylinder 30 rises inside the can 10 to a position where the casters 15 are disposed. Further, the combustion gas whose rise is blocked by the casters 15 goes up around the plurality of water pipes 12 through the gaps of the plurality of water pipes 12, rises, and is discharged from the exhaust pipe 80 to the outside. Thereby, the water supplied into the plurality of water pipes 12 is efficiently heated and steam is generated.

  According to the boiler 1 of this embodiment demonstrated above, there exist the following effects.

  (1) Boiler 1, a burner 20 that is disposed at the bottom of the can body 10 and ejects fuel gas upward, a combustion cylinder 30 that is disposed outside the burner 20, and a circumferential surface of the combustion cylinder 30 And a plurality of through holes 31 formed. Thereby, the air introduced from the air introduction port 51 can be introduced into the space between the burner 20 and the combustion cylinder 30 in a rectified state without causing a drift through the plurality of through holes 31. Therefore, since air can be uniformly mixed with the fuel gas ejected from the burner 20, the combustibility of the boiler 1 can be improved.

  (2) The lower end portion of the combustion cylinder 30 was connected to the lid portion 23, and the upper end portion of the combustion cylinder 30 was positioned above the upper end portion of the burner 20. Thereby, air can be introduced into the space between the burner 20 and the combustion cylinder 30 only from the plurality of through holes 31 formed in the combustion cylinder 30. Therefore, since more rectified air can be introduced into the space between the burner 20 and the combustion cylinder 30, the combustibility of the boiler 1 can be further improved.

  (3) In the case where members such as the spark rod 60 and the flame rod 70 are arranged in the space between the burner 20 and the combustion cylinder 30, drift is likely to occur due to the arrangement of these members. Therefore, the plurality of through holes 31 are formed over the entire circumference of the lower region on the peripheral surface of the combustion cylinder 30. Thereby, since air can be introduced into the space between the burner 20 and the combustion cylinder 30 from the entire circumference of the combustion cylinder 30, it is possible to reduce the influence of drift due to the arrangement of the spark rod 60, the flame rod 70, and the like.

As mentioned above, although preferable embodiment of the boiler of this invention was described, this invention is not restricted to embodiment mentioned above, It can change suitably.
For example, in the present embodiment, the combustion cylinder 30 is configured by connecting two members, but is not limited thereto. That is, the combustion cylinder may be constituted by a single member, and a through hole may be formed in a part of the combustion cylinder.

DESCRIPTION OF SYMBOLS 1 Boiler 10 Can body 20 Burner 21 Nozzle part 22 Burner head 22a Through hole 23 Lid part 30 Combustion cylinder 31 Through hole 51 Air inlet 60 Spark rod 70 Flame rod

Claims (5)

A cylindrical can extending in the vertical direction;
A burner disposed at the bottom of the can body and ejecting fuel gas upward;
A combustion cylinder disposed outside the burner and covering the periphery of the burner;
A plurality of through holes formed in the peripheral surface of the combustion cylinder;
A boiler provided with an air inlet arranged on a side of the combustion cylinder.   The burner is provided at a lower portion of the can body and covers a lower portion of the can body, a tubular nozzle portion penetrating the lid portion and extending upward, and an upper end portion of the nozzle portion. The boiler according to claim 1, comprising a burner head having a shape whose diameter is increased toward the diameter, and a plurality of through holes formed in the burner head.   The boiler according to claim 2, wherein a lower end portion of the combustion cylinder is joined to the lid portion, and an upper end portion of the combustion cylinder is positioned above an upper end portion of the burner. A spark rod disposed between the burner and the combustion cylinder; and a flame rod;
The boiler according to claim 2 or 3, wherein the tip end portion of the spark rod and the tip end portion of the flame rod are inserted into the burner from a through hole formed in the burner head.   The boiler according to any one of claims 1 to 4, wherein the plurality of through holes are formed over the entire circumference of a lower region of the circumferential surface of the combustion cylinder.

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