JPH0663602B2 - Vertical boiler - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a conventional vertical boiler, which has a cylindrical outer can and an inner can and is extremely simple and highly efficient. Is.

[Conventional technology]

Conventional so-called vertical boilers have smoke tubes and water tubes installed separately in the upper part of the combustion chamber, and there are well-known ones such as Cochrane boilers. Was used as a prize. (Refer to FIG. 6 and FIG. 7) [Problems to be Solved by the Invention] However, the present inventors have proposed a conventional boiler with a simple structure, high thermal efficiency, and low cost. As a result of a detailed examination of the vertical boiler, in addition to the fatal drawback that the height of the main body is high in the conventional vertical boiler, (b) its structure is extremely complicated, and partly pressure resistant design It has a difficult part on the top.

There are many accidents caused by (c) and (b).

(D) Manufacturing cost is high.

On the other hand, on the other hand, a vacuum hot water boiler has become popular because it has various characteristics in recent years.
As a result of the inventor's detailed examination of the vacuum hot water boiler, the vacuum hot water boiler has a flat plate heat transfer surface inside the inner can. There are many problems in repairing or repairing.

(F) There is a problem in that it is disadvantageous in heat transfer and the heat efficiency is extremely poor.

It has been found.

As a result of examining the above-mentioned conventional vertical boiler and vacuum hot water boiler, the present inventors, in view of various problems found, achieve the object of the present inventor by solving these problems. As a result of diligent research with the idea that it will be possible to construct a boiler main body with an outer can and an inner can, and rationally arrange the combustion chamber and water tube group in the inner can, gas with a high heat exchange rate The present invention has been accomplished by achieving the above object by constructing the flow path.

[Means for solving problems]

According to the present invention, an upright cylindrical inner can having a part of a water pipe group opened up and down is inserted into an upright cylindrical outer can whose upper and lower sides are closed. The water pipe for defining the downstream side has a membrane structure or a closely arranged structure, one or more rows of large-diameter pipes are erected, and the downstream side water pipe is a small-diameter pipe, and the large-diameter water pipe line The present invention provides a vertical boiler in which a gas flow path is left at one end or at an appropriate position between water pipe rows of the large diameter pipe, and a water pipe group is erected on the downstream side.

〔Example〕

 An example of the present invention will be described below.

FIG. 1 is a vertical sectional view of an embodiment of the vertical cylindrical boiler of the present invention, and FIG. 2 is a horizontal sectional view of FIG.

In FIGS. 1 and 2, a cylindrical inner can (2) is inserted into a cylindrical outer can (1), and the combustion chamber (3) and the downstream side are arranged in the cylindrical inner can (2) on the left and right. A defining water pipe (4) with a vertical fin (8) having a membrane structure for defining the water pipe group (5) is erected while leaving a gas passage (10) at the end.

The fuel is burned in the combustion chamber (3) by the burner (6), and the combustion gas passes through the downstream water pipe group (5) defined by the water pipe (4) having the vertical fins (8) to the exhaust port (5). It is discharged from 7).

In this case, instead of the water pipe with the vertical fin (8), the vertical fin (8) is eliminated, and as shown in FIG. Good.

In the present invention, the vertical fin water pipe (4) is preferably a large-diameter pipe that does not make the combustion chamber too narrow in order to reduce the fin welding man-hours, or the fins may be eliminated to provide a closely arranged structure. .

In addition, it is desirable to use a pipe with a diameter as small as possible in order to improve heat transfer efficiency in the water pipe on the downstream side.

Further, the defining water pipes (4) may have two or more rows as shown in FIG. 4, and may have gas passages at appropriate places as shown in FIG.

For example, in FIG. 1, when a cylindrical outer can (1) having a diameter of 900 to 1300 mm and a cylindrical inner pipe (2) having a diameter of 700 to 1100 mm are used, the diameter of the vertical fin water pipe (4) having a large diameter is, for example, 50
~ 100mm The diameter of the small diameter pipe (5) on the downstream side is, for example, 20 ~ 50mm.
The degree is suitable. Since the water pipe group is exposed to high-temperature gas near the exit of the combustion chamber, it is preferable to use a bare pipe, and further downstream use a heat transfer surface expansion pipe such as a radial fin, stud, or spine.

Furthermore, the lower part of the cylindrical inner pipe (2) is connected to the downward heat transfer surface, and when the heat load becomes large, so-called steam retention (steam plank) causes burnout, so that the entire cylindrical inner can (2) becomes vertical. On the other hand, it is desirable to incline by 3 degrees or more.

As described above, in the vertical boiler of the present invention, the depth of the combustion chamber (3) can be sufficiently set in the cylindrical inner can (2), and the flame does not approach, contact or hit the cooling surface, which is extremely convenient for combustion. In addition, the combustion chamber (3) and the downstream water pipe group (5) can be arranged in the cylindrical inner can (2) in a rational arrangement such that the flow velocity and the temperature distribution are uniform, and the gas flow path with extremely high heat transfer efficiency. There is an advantage that the configuration can be obtained.

〔The invention's effect〕

 The effects of the present invention are summarized as follows.

(I) In the present invention, an inexpensive burner can be used because the combustion chamber can be long for a small space due to its structure.

(Ii) Since the structure of the vertical boiler of the present invention is simple, it is safe, the manufacturing cost is low, the depth of the combustion chamber can be sufficiently taken in the cylindrical inner can (2), and the flame can be cooled. Since there is no approach, contact, or contact with each other, it is extremely convenient for combustion, and the combustion chamber (3) and the downstream water pipe group (5) are provided in the cylindrical inner can (2).
Can be rationalized such that the flow velocity and temperature distribution are uniform, and the gas flow velocity configuration has an extremely good heat transfer efficiency, resulting in high efficiency as a boiler.

(Iii) When the entire inner can of the present invention is tilted vertically by 3 degrees or more, there is no risk of burning due to a so-called steam blanket.

[Brief description of drawings]

FIGS. 1, 2, 3, 4, and 5 are schematic explanatory views of an embodiment of the present invention. FIG. 1 is a vertical cross-sectional view, and FIG. 2 is a cross-sectional view of FIG. 1 in the case of a membrane structure. FIGS. 3A and 3B show cross-sectional views of FIG. 1 in the case of a skin structure. FIG. 4 is a cross-sectional view in the case of an example of a defined water pipe, and FIG. 5 is a cross-sectional view in the case where a gas flow path is provided at an appropriate location in the defined water pipe row.
6 and 7 are schematic explanatory views of a conventional general vertical water pipe boiler, FIG. 6 is a front view, and FIG. 7 is a sectional view taken along line AA in FIG. 8 and 9 are schematic explanatory views of a conventional vacuum hot water boiler, FIG. 8 is a longitudinal sectional view, and FIG. 9 is a transverse sectional view of FIG. 1 ... Cylindrical outer can 2 ... Cylindrical inner can 3 ... Combustion chamber 4 ... Defining water pipe 5 ... Downstream water pipe group 6 ... Burner port 7 ... Exhaust port 8 ... Vertical fin 10 ... Gas passage

Front Page Continuation (72) Inventor Yasuo Noguchi 1-936 Oyodokita, Oyodo-ku, Osaka City, Osaka Prefecture Hirakawa Iron Works Co., Ltd. ) References JP-A-49-72752 (JP, A) JP-A-49-113902 (JP, A)

Claims (3)

[Claims] 1. An upright cylindrical inner can, which is partly provided with a water pipe group that opens up and down, is inserted into an upright cylindrical outer can closed up and down,
In the cylindrical inner can, water pipes for defining the combustion chamber side and the downstream side are formed on the left and right sides in a membrane structure or in a closely arranged structure. Is a small-diameter water pipe, a gas flow path is left at one end of the water pipe array of the large-diameter pipe or at an appropriate location between the water pipe arrays of the large-diameter pipe, and a water pipe group is erected on the downstream side. boiler. 2. The vertical boiler according to claim 1, wherein the cylindrical inner can is inclined at an angle of 3 degrees or more from the vertical. 3. The vertical boiler according to claim 1, wherein the downstream side water pipe is a bare pipe on the upstream side and a heat transfer pipe with radial fins on the downstream side.