JPH0645123Y2 - boiler - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a boiler provided with a single evaporation tube having a J-shaped lower part of the evaporation tube, the applicant of which is one of the co-applicants. Invention No. 234567, 1984 (filing date, November 7, 1984,
JP-A-61-125503).

[Conventional technology]

Although the invention of the above-mentioned prior application, Japanese Patent Application No. 234567, was not expected in the conventional once-through boiler described in the specification, the inventors of the present invention continued to study earnestly, and as a result, In a boiler of the type, troubles such as burning of the evaporation pipe and after-boiling due to heat accumulation in the flame of the furnace will occur, and it is more effective to surround the evaporation chamber upper vapor chamber with a refractory material or a heat insulating material. It turned out by the present inventor.

[Problems to be solved by the invention]

In view of the above, the present invention has been earnestly studied by the present inventors for the purpose of completely eliminating burnout and post-boiling caused by a considerable amount of heat stored in the burner flame of the combustion chamber (referred to as a furnace) in the J-type boiler. As a result, J with single or multiple evaporation tubes
It has been found that the object of the present invention can be achieved completely by forming a so-called furnace structure of a type boiler in a socking structure and connecting the upper part of the socking to the evaporation tube, and to complete the invention. It arrived.

[Means for solving problems]

The present invention is a boiler in which a lower part of an evaporation pipe having a single evaporation pipe is bent into a J shape, and the structure around the furnace is arranged as a pipe-conveying structure. A single or a plurality of connecting pipes are provided between the pipes, and the pipe header is attached with an angle of 3 ° or more so that the upper end of the pipe is the uppermost end of the vaporizing pipe, and the upper vapor chamber of the vaporizing pipe is fireproofed. To provide a boiler equipped with a water supply pipe at the head of the evaporation pipe, with or without coating with a material or a heat insulating material, the outer circumference of the evaporation pipe is an expanded heat transfer surface composed of spines or fins.

In the above-mentioned prior invention (Japanese Patent Application No. 59-234567), the J-shaped end of the lower part of the evaporation tube is exposed outside the combustion chamber, and the bottommost portion outside the combustion chamber is not heated. In the above, it is not necessary to let the J-shaped end of the lower part of the evaporation tube out of the combustion chamber.

Moreover, the blow pipe is made to connect to the header.

Further, in the case of a single evaporation pipe, in order to facilitate the flow of bubbles in the header, a single or a plurality of connecting pipes are provided between the lower part of the evaporator pipe and the header, and the upper end of the header is on the evaporation pipe side. It is desirable to incline the angle by 3 degrees or more so that the uppermost end is.

In this case, when the upper portion of the pipe drawer is inclined at an angle of less than 3 degrees with the evaporation pipe side being the uppermost end, bubbles generated by the pipe drawer tend to escape to the evaporation pipe side.

Next, the present invention will be described with reference to the drawings.

[Comparative example]

FIG. 1 (A) is a comparative example of a J-type boiler provided with a single evaporation pipe, and FIG. 1 (B) is a schematic front view of the evaporation pipe of FIG.

FIG. 2 (A) is another comparative example of a J-type boiler having a plurality of evaporation pipes, and FIG. 2 (B) is a schematic front view of the evaporation pipe and the header of (A).

(Embodiment) FIG. 3 (A) shows an embodiment in which a plurality of connecting pipes are provided between the lower portion of the evaporation pipe of the present invention and a pipe header to be connected. The schematic front view which shows an evaporation pipe, a header, and a connection pipe is shown. In this case, the angle α is inclined by about 3 degrees so that the upper end of the tube drawer has the evaporation tube side as the uppermost end.

FIG. 4 is a schematic cross-sectional view of another embodiment in which the angle α is inclined by about 3 degrees so that the upper end of the header surrounding the furnace of the present invention has the uppermost end on the evaporation pipe side.

In the J-type boiler equipped with a single evaporator tube shown in FIGS. 3 and 4, it is arranged as a header (23) to ensure the safety around the furnace (12) below the evaporator tube (1). 3, FIGS. 3 (A), (B), and FIG. 4 are provided with a connecting pipe (21) for promptly feeding bubbles or the like generated in the header (23) into the evaporation pipe (1). Is. The angle α in FIGS. 3 and 4 is at least 3 degrees, and if it is 3 degrees or more, it is possible to smoothly send the bubbles generated in the header (23) into the evaporation tube (1).

5 shows the case where the upper vapor chamber of the single vaporization pipe of FIG. 3 is coated with a heat insulating material, and FIG. 6 shows the case where the upper vapor chambers of the plurality of vaporization pipes of FIG. 2 are coated with a heat insulating material.

Also in the comparative example having a plurality of evaporation pipes (1) and (1 ') as shown in FIG. 2, the lower parts of the evaporation pipes (1) and (1') should completely surround the furnace (12). Since the pipe header (23) is directly connected, the bubbles generated in the pipe header (23) are smoothly guided to the evaporation pipe without the need for a connecting pipe. (2) Fine,
(3) Steam chamber, (5) Blow pipe, (8) Burner, (9)
They are an air pushing fan, (13) exhaust gas duct, and (18) flue.

[Effect of device]

Since the present invention is connected to the lower part of the evaporation tube by forming a pipe-drawing structure that surrounds the circumference of the furnace, it has the advantage of completely eliminating problems such as burnout and post-boiling due to the heat storage amount of the furnace. Instability of circulation and accumulation of scale in the evaporation pipe, which is caused by the J-type of conventional multi-tube type once-through boiler, and further, burning and rupture due to overheating are prevented, and the structure is simple and inexpensive. It can be manufactured, the safety factor is high, and the steam separator is installed in the upper steam chamber of the evaporation pipe.
Furthermore, if the upper evaporation pipe on the upper part is covered with a refractory material or a heat insulating material, the dryness of the generated steam becomes high, the heating is prevented and the quality of the steam is improved. By installing it at an angle of 3 degrees or more, it is possible to expel bubbles generated in the header to the evaporation pipe side as quickly as possible, and there is no trouble due to bubble stagnation and boiler safety is improved. There are many advantages, such as a significant increase.

[Brief description of drawings]

FIG. 1 (A) is an example of a cross-sectional view of a J-type boiler in which a header is connected to a single evaporation pipe, and FIG. 1 (B) is an evaporation pipe of (A),
FIG. 2A shows a schematic front view of the evaporation pipe of FIG. 2A, and FIG. 2A shows a schematic front view of the evaporation pipe of FIG. . Fig. 3 (A) shows that between the bottom of the evaporation tube and the connecting pipe,
In one embodiment of the present invention in which a plurality of connecting pipes are provided and the angle α is inclined by about 3 degrees so that the upper end of the header is on the side of the evaporation pipe, the evaporation pipe of FIG. FIG. 4 is a schematic front view showing a header and a connecting pipe, and FIG. 4 shows an example in which the angle α is inclined by about 3 degrees so that the upper end of the header surrounding the furnace of the present invention has the evaporation pipe side as the uppermost end. Fig. 5 (A) is a schematic sectional view of an embodiment, Fig. 5 (A) is an embodiment in which the steam chamber of Fig. 3 is surrounded by a heat insulating material, Fig. 5 (B) is a schematic front view of (A), and Fig. 6 (A) is One embodiment of the case where the steam chamber of FIG. 2 is surrounded by a heat insulating material B is a schematic front view of (A). 1 …… Evaporation pipe 2 …… Fin 3 …… Steam chamber 5 …… Blow pipe 4 …… Steam chamber 6 …… Water supply pipe 8 …… Burner 10. …… Fuel pipe 12. …… Combustion chamber 13. …… Exhaust gas Duct 18 .. Flue 21 .. Connecting pipe 22 .. Insulation surrounding the steam chamber 23 ..

Front page continuation (72) Inventor Atsumi Kaminashi 1-936 Oyodokita, Oyodo-ku, Osaka City, Osaka Prefecture Hirakawa Iron Works Co., Ltd. (56) References 45-36950 (JP, B1)

Claims (2)

[Scope of utility model registration request] 1. A boiler in which a lower part of a single evaporation pipe is bent into a J shape has a pipe-conveying structure around the combustion chamber in the lower part of the evaporation pipe, and the evaporation pipe is directly connected to the upper part of the pipe-conveying pipe. A single or a plurality of connecting pipes are provided between the lower portion and the header, and the header is attached with an angle of 3 ° or more so that the upper end of the header is on the evaporation pipe side. Boiler to be. 2. A utility model registration claim 1 characterized in that, in a boiler in which the lower part of the evaporation tube is bent into a J shape, the evaporation chamber above the evaporation tube is surrounded by a refractory material or a heat insulating material. boiler.