JP2506011B2 - Boiler body structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boiler body structure,
More specifically, the present invention relates to a boiler body structure in which a good heat exchange efficiency is maintained and a manufacturing cost is reduced by using the boiler body as a simple tubular structure. INDUSTRIAL APPLICABILITY The present invention can be suitably used for, for example, a small boiler and a simple boiler.

[0002]

2. Description of the Related Art FIGS. 6, 7, and 8 are sectional views of conventional boiler bodies. In the figure, 31 is a burner, 32 is boiler water, 33 is a combustion tube, 34 is a heat exchange tube, 37 is a rectification tube,
38 is an outer frame, 39 is a combustion chamber, 40 is a chimney connection port, 44 is a smoke pipe, 45 is a water supply port, and 46 is a tap hole. In the case of a conventional boiler body structure, for example, a furnace tube smoke tube type which occupies the mainstream of the present boiler shown in FIG. 6, a large number of smoke tubes 44 are welded and connected from the upper part of the combustion tube 33 with good watertightness and airtightness, and these can bodies are The space between the outer frame 38 and the outer frame 38 is filled with the boiler water 32. The high temperature combustion gas generated by burning oil or gas in the combustion chamber 39 by the burner 31 exchanges heat with the boiler water 32 in the combustion tube 33 and the smoke pipe 44 to raise the temperature of the boiler water, and the combustion gas is the same as in FIG. Is sent to the chimney connection port 40 and is discharged from there through a chimney (not shown). The boiler water 32 is sequentially supplied from a water supply port 45 provided in the lower portion of the outer frame 38, and the heat-exchanged boiler water is turned into hot water and sent out from the upper hot water outlet port 46. This furnace tube smoke tube type is excellent in heat exchange efficiency because a large number of smoke tubes 44 are connected to the combustion tube 33, but the large number of smoke tubes complicates the boiler main body structure and requires watertightness and airtightness. There are many welded parts, high technology is required for production, and the cost is high. The single cylinder type shown in FIG. 7 has a combustion cylinder 33 and a heat exchange cylinder 3.
Although the boiler body structure can be simplified and the cost can be reduced by reducing the number of welded parts by integrating the four, the temperature of the combustion gas discharged from the chimney connection port 40 is as high as about 400 ° C, indicating that the heat exchange efficiency is poor. . Further, the bottom portion of the rectifying cylinder 37 indicated by B is not cooled by the boiler water, and becomes hot due to the flame radiation in the combustion chamber 39, so that durability is deteriorated unless it has high heat resistance.

Therefore, as shown in FIG. 8 as an improved type of the single cylinder type, the combustion cylinder 33 and the heat exchange cylinder 34 are squeezed at the C portion so that the B portion of the rectifying cylinder 37 is not directly exposed to the flame radiation, and the boiler water is squeezed. If a water cooling wall is formed to suppress overheating, the structure is complicated because the C portion is constricted, and the cost increases. The conventional boiler body is commonly equipped with the heat exchange tube 3 on the combustion tube 33.
4 or the smoke pipe 44 is arranged, it becomes longer in the vertical direction, but it cannot be so high due to the installation location of the boiler and the convenience of maintenance, and the burner 31 may be burned in the horizontal direction as shown in FIGS. 6 to 8. Many. Therefore, as shown in FIGS. 6 to 8, since the combustion chamber 39 needs to secure a volume required for combustion, the height L ₂ is suppressed and the diameter D _{2 is set} to be relatively large, and L ₂ / D ₂ is 1 to 1. It was set to about 1.5. However, the diameter D
_{As 2} becomes larger, it becomes weaker against water pressure from the outside, and in order to increase the pressure resistance of the combustion chamber against boiler water, it is possible to add pleats called bulges to the combustion cylinder to reinforce it or increase the wall thickness of the cylinder itself. Be seen.

[0004]

As described above, the conventional boiler main body structure has a large heat transfer area in the heat exchange portion as seen in the furnace tube type, the single tube type and its improved type. If the exchange efficiency is increased, the structure becomes complicated and the cost increases, and conversely, if the cost is reduced with a simple structure such as a single cylinder type, the heat exchange efficiency deteriorates. As described above, in the boiler body structure, it is not easy to satisfy the contradictory requirements of reduction of manufacturing cost and improvement of heat exchange efficiency. Further, the combustion chamber 39 of the conventional boiler needs to have a diameter D ₂ larger than the height L ₂ (L ₂ / D ₂ = 1 to 1.5 in the related art) in order to increase the pressure resistance against the hydraulic pressure of the boiler water. Bulging is added and the wall thickness of the combustion cylinder is increased, which causes a problem of increased cost. The present invention has been made in view of the above problems, and an object of the present invention is to provide a boiler main body structure having pressure resistance, high heat exchange efficiency, simple structure, and low manufacturing cost.

[0005]

[Problems to be Solved by the Invention] The above problems are caused by the burner 1
In the boiler main body provided with a combustion tube 13 in which 1 is attached axially above the combustion chamber 19 and a communication path 15 that connects the combustion tube 13 to the heat exchange section, the heat exchange section is independent of the combustion tube 13 and Of heat exchange cylinders 14 each having less than four heat exchange cylinders, and each of the heat exchange cylinders 14 has a straightening plate 16 spirally formed on the outer surface of the heat exchange cylinders 14 whose pitch interval reduces the volume of the combustion gas due to cooling of the combustion gas. The problem is solved by providing a boiler body structure characterized in that a detachable rectifying cylinder arranged so as to be correspondingly small is mounted.

[0006]

In the boiler body structure of the present invention, the burner 11 is attached to the combustion cylinder 13 in the axial direction of the combustion chamber, and the combustion cylinder 13 is further installed.
And the heat exchange cylinder 14 are independent of each other, the combustion cylinder 1
3 and (heat exchange tube 14) (tube length) / (tube diameter) 4
Since the diameter can be reduced to ˜6, a simple and pressure-resistant structure can be easily obtained, the cost can be reduced, and the combustion chamber 13 and the heat exchange tube 14 are separately provided and are connected by the communication path 15, so that the rectification is performed. Since the cylinder 17 is not directly subjected to flame radiation, it is possible to reduce the cost because it is not necessary to perform pressure resistance treatment on the rectification cylinder, and the rectification cylinder 17 in the heat exchange cylinder 14 is detachably mounted, so that maintenance or the like is not required. Easy to do, with insulation 24 inside
By disposing the straightening plate 16 in a spiral shape on the outer surface of the straightening cylinder 17 in which the gas is inserted, in addition to the fact that the combustion gas can be efficiently heat-exchanged by the heat exchange wall without being removed from the cylinder,
By using four heat exchange tubes, the heat output is increased, the heat exchange rate is increased, and the furnace load (FL) is increased.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. Referring to FIG. 3, in the boiler body structure for exchanging the combustion heat of the burner 11 with the heat medium 12, the combustion cylinder 13 in which the burner 11 is attached in the axial direction of the combustion chamber 19
(Inner diameter D ₁ , combustion chamber length L ₁ ), two heat exchange tubes 14 independent of the combustion tube 13 for exchanging heat of the combustion gas from the combustion tube 13, and communication for connecting between the combustion tube 13 and the heat exchange tube 14. Road 1
5, the heat exchange cylinder 14 is spirally outwardly provided in the heat exchange cylinder 14
6 is provided and a detachable rectifying cylinder 17 with a heat insulating material 24 is installed inside. The burner 11 is a combustion means serving as a heat source of the boiler, and, for example, an oil burner or a gas burner can be preferably used, and the heat medium 1
2 is generally used as boiler water, and the combustion cylinder 13
Is a cylindrical container connected to the burner 11 and the space therein is a combustion chamber 19. The combustion cylinder 13 receives the hydraulic pressure of the boiler water, and therefore has a pressure-resistant cylindrical shape or a similar structure. . Attaching the burner 11 in the axial direction of the combustion chamber means attaching the outlet of the burner in the same direction as the shaft of the combustion chamber having a cylindrical shape or a similar shape (in the case of a cylindrical shape, the cylinder direction). The diameter of the combustion chamber can be reduced by making the flame produced in the combustion chamber into an elongated flame. The heat exchange cylinder 14 is a cylinder that exchanges heat of the combustion gas from the combustion cylinder 13 with the heat medium 12. The heat exchange tube 14 is the combustion tube 1
It has a cylindrical structure independent of 3. A rectifying cylinder 17 is detachably mounted in the heat exchange cylinder. Rectifying cylinder 17
Is a commutation cylinder 17 so that the combustion gas does not pass through the heat exchange part, that is, the part between the commutation cylinder 17 and the heat exchange cylinder 14.
The combustion gas is efficiently heat-exchanged with the straightening plate 16 spirally arranged on the outside. That is, as the combustion gas rotates along the straightening plate 16 provided in a spiral shape, a centrifugal force acts and the combustion gas makes contact with the outer heat exchange cylinder 14 so as to lick it, so that the heat transfer on this surface is good. Improves heat exchange efficiency. As a preferable structure example of the flow straightening cylinder 17, a heat insulating material or a heat insulating material is put inside to make the gap between the straightening cylinder 17 and the heat exchange cylinder 14 as small as possible (for example, about 17 mm),
The current plate 16 is spirally arranged in the gap. Since the rectifying plate 16 is provided in the rectifying cylinder 17 inside the heat exchange cylinder 14, the welding is not required to be watertight and airtight, and the work is easy. It is desirable that the pitch width of the spiral of the straightening vanes 16 be changed according to the decrease in volume of the combustion gas due to cooling, so that the flow velocity of the gas is kept constant. The spiral of the baffle plate can be double or more. The communication path 15 is a pipe that connects the independent combustion cylinder 13 and the heat exchange cylinder 14 and sends combustion gas. In FIG. 3, for example, a burner 1 using oil
1 is installed from above the cylindrical combustion chamber 19 in the axial direction (here, downward) of the combustion chamber. As shown in FIG. 1, the combustion cylinder 13 and the two heat exchange cylinders 14 are arranged in an outer frame 18 of the boiler main body so as to stand two cylindrical cylinders in parallel with each other. Is filled with a heat medium (boiler water) 12. The lower part between the combustion cylinder 13 and the heat exchange cylinder 14 is connected by a communication path 15, and the combustion gas is conveyed to the heat exchange cylinder 14 through this. Rectifier cylinder 1 mounted in the heat exchange cylinder 14
As shown in FIG. 4, 7 is provided with a hanger 21, a lid 22 and a handle 23 on the upper part thereof to facilitate attachment / detachment to / from the heat exchange tube 14.
A heat insulating material 24 is provided inside, and in this case, a 17 mm-wide rectifying plate 16 is point-bonded to the surface in a double spiral shape. The operation of the boiler body structure having these configurations will be specifically described below. Gas or oil from the burner 11 is burned in the combustion chamber 19 to generate high temperature combustion gas. The combustion gas hits the water cooling wall at the bottom of the combustion chamber 19 and exchanges heat to be cooled while passing through the communication passage 15 and the heat exchange cylinder 1
Enter 4. Therefore, overheating of the rectifying cylinder 17 due to flame radiation does not pose a problem. The combustion gas rotates and rises while being guided between the heat exchange cylinder 14 and the rectifying cylinder 17 by the rectifying plate 16 arranged outside the rectifying cylinder 17. At this time, due to the centrifugal force acting on the combustion gas, the combustion gas comes into contact with the outer heat exchange cylinder 14 so as to lick it, and efficient heat exchange is performed. With such a simple structure, the heat exchange rate can be improved unlike the conventional single cylinder type. Since the pitch of the straightening vanes 16 is gradually reduced in accordance with the decrease in volume due to the cooling of the combustion gas, the flow velocity of the combustion gas can be kept constant and efficient heat exchange can be performed. The combustion gas that has been sufficiently heat-exchanged and cooled is discharged through the chimney connection port 20. On the other hand, the boiler water 12 that has undergone heat exchange and whose temperature has risen is
The water is sent out from the hot water outlet 26 at the upper part of the boiler body, and the water is supplied from the water supply port 25 at the lower part. In this way, the boiler main body structure of the embodiment of the present invention has a simple structure, so that it can be manufactured at low cost, maintenance can be easily performed, and high heat exchange efficiency is provided.

In the embodiment of the present invention, two heat exchange tubes 14 are provided.
And heat output 7.8 × 10⁴Kcal / h boiler
Was. In the present invention, as shown in FIG.
Then, the two heat exchange tubes 14 are arranged in a V shape, and the connecting path 15
I am contacting you. In this way, the heat output of the combustion cylinder 13 is increased.
20x10 by increasing the heat exchange cylinder 14⁴K
It is possible to easily produce a cal / h boiler.
Become. FIG. 2 is a top view of the example shown in FIG. This example
Compared to the case where there is only one heat exchange cylinder 14,
The structure is different, but at a sufficiently low cost compared to the conventional example
Production is possible, easy maintenance, and high heat exchange
Provides conversion rate. Comparing this with a concrete example, the slave of FIG.
The conventional flue-tube type boiler has a heat output of 7.0 × 10.⁴Kc
al / h, combustion chamber diameter D₂= 390 mm, combustion chamber length L₂
= 550 mm and outer frame height = 1030 mm,
The boiler of the embodiment of the present invention has a heat output of 7.8 × 10.⁴Kcal
/ H, combustion chamber diameter D₁= 200 mm, combustion chamber length L₁= 1
The height was 100 mm and the outer frame height was 1030 mm. Combustion gas
Figure 5 shows the temperature change depending on the height of the heat exchange tube
Looking at it (the dotted line and the solid line indicate the temperature of each of the two heat exchange tubes)
Yes, the combustion gas entering the heat exchange tube is 700-80
It was 0 ℃, but the temperature of the gas after heat exchange was about 240 ℃
It is cooled every time. This is a conventional boiler of about the same scale
Compared with the single cylinder type, the exhaust gas temperature is about 400 ° C.
The high temperature is about 300 ° C even for the single cylinder type and improved type.
Therefore, the efficiency of the boiler body structure of the embodiment of the present invention is excellent.
Is understood. Furnace Road (FL)
Even so, it is possible to compare the efficiency with the conventional example. Fa
Engine load (FL) is the input divided by the combustion chamber volume.
It is a value and is expressed by the following formula. FL (Kcal / h / m³) = Input (Kcal / h) / combustion chamber volume (m³) Combustion chamber volume (m³) = (ΠD²・ L) / 4 where D is the combustion chamber diameter and L is the combustion chamber length. The relationship between input and output is calculated by the following formula. Input = output ÷ efficiency The value of the furnace load calculated from the above equation is the case of the conventional type: 80 to 120 × 10⁴Kcal / h / m³  In the case of the embodiment of the present invention: 200 to 300 × 10⁴Kcal / h / m³ Became. If the value of this furnace load is large, the combustion
It means that a large output can be produced despite the small chamber volume.
Therefore, the embodiment of the present invention has a unit volume of the combustion chamber as compared with the conventional example.
It is possible to obtain about twice as high output per
Become. If the output is the same, the body of the compact boiler
It can be structured. The embodiment of the present invention is the boiler main body.
Described as using two heat exchange tubes 14 in the structure
As is clear, three to four heat exchange tubes 14 are connected from the combustion tube 13 in series.
It is also possible to connect by means of the trajectories 15. Heat exchange tube 14
Can take two or more, but the smaller the number,
It is preferable and practical. However, when the number is 5 or more
The structure becomes complicated and the effect of cost reduction is reduced.

[0009]

As described above, in the boiler body structure of the present invention, since the diameter of the can body portion can be made small, the structural pressure resistance increases and the material cost is low, and the boiler body has a simple can body structure. As a result, the maintenance can be easily performed, the manufacturing cost can be reduced, and the heat exchange rate can be high.

[Brief description of drawings]

1 is a cross-sectional view of an embodiment of the present invention.

FIG. 2 is a top view of an embodiment of the present invention.

FIG. 3 is a vertical sectional view of a boiler body structure according to an embodiment of the present invention.

FIG. 4 is a partial cross-sectional view of a heat exchange tube.

FIG. 5 is a polygonal diagram showing a temperature change of a combustion gas temperature depending on a height of a heat exchange tube.

FIG. 6 is a cross-sectional view of a conventional boiler body.

FIG. 7 is a cross-sectional view of a conventional boiler body.

FIG. 8 is a sectional view of a conventional boiler body.

[Explanation of symbols]

 11 Burner 12 Heat Medium (Boiler Water) 13 Combustion Cylinder 14 Heat Exchange Cylinder 15 Communication Channel 16 Straightening Plate 17 Straightening Cylinder 18 Outer Frame 19 Combustion Chamber 20 Chimney Connection Port 21 Suspension Tool 22 Lid 23 Handle 24 Insulation Material

Claims (1)

(57) [Claims] 1. A boiler body comprising a combustion cylinder (13) having a burner (11) mounted axially above a combustion chamber (19) and a communication path (15) for connecting the combustion cylinder (13) to a heat exchange section. The heat exchange section is independent of the combustion tube (13) and heat-exchanges the combustion gas from the combustion tube (13).
4), of the combustion tube (13) and the heat exchange tube (14) (tube length)
/ Set within a range value from 4 to 6 of the (cylindrical diameter), the pitch of the rectifying plate (16) helically on the outer surface of each of the heat exchange tube (14) in the cooling of the combustion gas A boiler main body structure, characterized in that a detachable rectifying cylinder (17) arranged so as to be small in correspondence with a decrease in volume due to is attached.