JPH0655001U - Can body structure of multi-tube once-through boiler - Google Patents

Abstract

(57) [Summary] [Purpose] To make a highly efficient multi-tube once-through boiler by reducing the installation area and effectively utilizing heat. [Composition] A multi-tube once-through boiler configured such that the combustion chamber has a rectangular parallelepiped shape, the combustion chamber is divided into upper and lower parts, a burner and a combustion gas outlet are provided on one surface, and the combustion gas flows in a U-shape.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a can body structure of a multi-tube once-through boiler, which can improve efficiency by effectively utilizing the heat of combustion gas.

[0002]

[Prior art]

 An ordinary multi-tube once-through boiler has a structure in which a combustion chamber is provided in the center, a burner is attached downward on the upper part of the combustion chamber, and a vertical water pipe is arranged so as to surround the combustion chamber. However, with this structure, the combustion chamber became large and it became a boiler with a large installation area. Therefore, as a boiler that requires a small installation area, there has been developed a boiler (Japanese Patent Laid-Open No. 60-205105) in which a burner is attached to the side wall of the boiler and a water pipe is heated from the side.

However, since the exhausted combustion gas still has heat, it was necessary to effectively use the heat for higher efficiency. However, if a preheater or the like is provided outside the boiler, the equipment becomes large. Will be invited.

[0004]

[Problems to be solved by the device]

 The present invention is intended to manufacture a boiler having a small installation area and high efficiency.

[0005]

[Means for Solving the Problems]

 A large number of vertically extending water pipes are provided in the rectangular parallelepiped boiler body, a part of the combustion chamber is divided so that the combustion gas can flow in a U shape, a burner is provided at one port and the other port is provided. Combustion gas outlet is provided. A flame is generated from the burner toward the water pipe, the combustion gas exchanges heat with the water pipe, reaches the side wall facing the burner, reverses in the combustion chamber, and is discharged from the combustion gas outlet on the same surface as the burner. The water pipe near the burner is a finless water pipe, and the water pipe near the combustion gas outlet is a finned water pipe to effectively use heat. Also, by installing the burner so that the combustion gas of the burner has a slight inclination in the pipe drawing direction with respect to the horizontal, the flow of the combustion gas is angled.

[0006]

[Action]

 The water pipe near the burner absorbs heat due to radiation, and because the combustion gas has a high temperature, sufficient heat is absorbed even in the finless water pipe, and the combustion gas after heat exchange in the finless water pipe is reversed in the combustion chamber, Heat is further exchanged by a finned water pipe with a large heat absorption surface. Boiler efficiency is greatly improved by absorbing heat from low-temperature combustion gas.

When the combustion gas reaches the wall facing the burner, the combustion gas is reversed and flows into the flow path on the combustion gas outlet side. If the combustion gas is made to flow horizontally, a water shutoff area will occur near the connection between the water pipe and the header on the surface facing the burner, leading to a drop in efficiency. Since the burner is installed so that the combustion gas flows slightly toward the pipe-heading side instead of being horizontal, the generation of water-stop areas is prevented and good heat exchange is performed.

[0008]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. FIGS. 1 and 2 relate to claim 1, and a plurality of vertical water pipes (1) are provided by connecting the upper part to the upper part (6) and the lower part to the lower part (7) of the rectangular parallelepiped boiler body. . The directions of the side surfaces of the combustion chamber are a, b, c and d, respectively. The b, c, and d side water pipes of the outer periphery of the vertical water pipe are connected by fins (8), and the water pipe and fins form an outer wall. A partition wall (2) that divides the combustion chamber into upper and lower parts is provided so as to contact the outer walls from the a side to the b / d side, and the vicinity of the c side outer wall is not divided and an opening ( 4) is provided. A flat burner (3) is provided in the upper part on the a side divided by the partition wall, and a combustion gas outlet (5) is provided in the lower part. For the water pipe, the pipe near the burner, which is in contact with the high-temperature combustion gas, shall be the pipe, the water pipe away from the burner shall be the spiral pipe, and the lower part of the water pipe divided by the partition wall shall be the finned water pipe. The water pipe in the opening is thin so that the gas can flow easily, and the combustion gas that reaches the c-side outer wall flows from the upper side to the lower side through the opening and reverses toward the combustion gas outlet. The water pipe near the burner absorbs heat due to radiation, and because the combustion gas has a high temperature, sufficient heat absorption is also performed in the raw water pipe, and the combustion gas after heat exchange in the raw water pipe is turbulent by the spiral water pipe. The generation of heat facilitates heat exchange. After that, the combustion gas that reaches the outer wall on the c-side and is reversed is further heat-exchanged by the finned water pipe having a large heat absorption surface, so that the boiler efficiency becomes very good.

FIG. 3 relates to claim 2, wherein a burner is provided at the lower part of the side surface a partitioned by the partition wall, and a combustion gas outlet is provided at the upper part. The combustion gas reaching the c-side outer wall flows from the lower side to the upper side through the opening, reverses and flows toward the combustion gas outlet.

FIGS. 4 and 5 relate to claim 3. Fig. 4 shows the case where the burner is installed on the upper side and the combustion gas outlet is installed on the lower side. The burner has its upper part separated from the water pipe and its lower part brought closer to the water pipe, with an inclination angle θ so that the combustion surface is slightly upward. Set up. Since the burner is directed upward by the tilt angle θ, the combustion gas flows slightly upward with respect to the horizontal direction. By angling the combustion gas, the combustion gas reaches the upper part of the c-side outer wall, and efficient heat exchange is performed. Figure 5 shows the case where the burner is installed on the lower side and the combustion gas outlet is installed on the upper side. The lower part of the burner is separated from the water pipe, the upper part is brought close to the water pipe, and the inclination angle θ is set so that the burning surface is slightly downward. Install. Since the burner is directed downward by the inclination angle θ, the combustion gas flows slightly downward with respect to the horizontal direction. By angling the combustion gas, the combustion gas reaches the lower part of the c-side outer wall.

[Effect of device]

 By implementing the present invention, it is possible to reduce the size of the boiler, and it is possible to provide a very excellent boiler with high boiler efficiency.

[Brief description of drawings]

1 is a sectional view of an embodiment of claim 1;

2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view of an embodiment of claim 2;

FIG. 4 is a sectional view of an embodiment in which the burner according to claim 3 is installed on the upper portion.

FIG. 5 is a sectional view of an embodiment in which the burner according to claim 3 is installed in a lower portion.

[Explanation of symbols]

 1 Vertical Water Pipe 2 Partition Wall 3 Flat Burner 4 Opening 5 Combustion Gas Outlet 6 Upper Pipe Alignment 7 Lower Pipe Alignment 8 Fins

Claims (3)

[Scope of utility model registration request] 1. A rectangular parallelepiped boiler main body is provided with an upper pipe header at an upper portion and a lower pipe header at a lower portion, a plurality of water pipes are connected between upper and lower pipe headers, a burner is provided on a side surface, and the water pipe is provided from a side surface. In a square-type multi-tube once-through boiler that heats, in the outer water tube, the other three surfaces except the burner surface are connected by fins to form the furnace wall, and the combustion surrounded by the furnace wall is performed. Inside the room, there is a partition wall that partitions the area other than the wall surface facing the burner surface into upper and lower parts.The lower side of the partition wall on the burner surface serves as the combustion gas outlet, and the burner is installed on the upper side so that the combustion gas flows from the upper stage to the lower stage. Can structure of a multi-tube once-through boiler configured to flow. 2. The boiler according to claim 1, wherein a combustion gas outlet is provided on an upper side of a burner surface partitioned by a partition wall, and a burner is provided on a lower side thereof so that the combustion gas flows from a lower stage to an upper stage. Can body structure of once-through boiler. 3. A boiler body structure for a multi-tube type once-through boiler according to claim 1 or 2, wherein the burners are installed so as to be inclined.