chimney

Abstract

The present invention provides a chimney that allows for easy connection of multiple horizontal pipes and ensures high exhaust efficiency by suppressing the stagnation of exhaust gas G within the flue, while maintaining standardization of components and easily setting the cross-sectional area according to the exhaust volume. [Solution] The chimney consists of multiple cylindrical chimney units connected together, comprising a lower chimney unit 10 with a rectangular cross-section, an upper chimney unit 20 with an oval cross-section, and a shape-changing joint 30 connecting them. The lower chimney unit 10 improves the ease of installation of horizontal pipes 40, 40 by providing openings 12a, 12b in the flat chimney walls 11a, 11c, and prevents interference of exhaust gas G by an internal partition plate 13. The upper chimney unit 20 has a pair of arc-shaped sections (arc-shaped chimney walls 21a, 21b) and a pair of straight sections (flat chimney walls 22a, 22b), and by adjusting the width dimension W of the straight sections while keeping the radius of curvature of the arcs fixed, the cross-sectional area according to the exhaust volume is set while ensuring the commonality of parts.

Description

Technical Field

[0001] The present invention relates to a chimney for guiding exhaust gas from an exhaust source such as an emergency gas turbine power generation device outdoors.

Background Art

[0002] Conventionally, as chimneys for exhausting large emergency gas turbine power generation devices, those with a square cross-section or a circular cross-section are generally used. A chimney with a square cross-section has the advantage of being well-suited for connecting a plurality of horizontal pipes from an exhaust source, but there is a problem that exhaust gas tends to stagnate at the four corners inside the chimney, increasing the exhaust resistance (draft resistance). On the other hand, although a circular chimney has excellent exhaust efficiency, the structure when connecting a plurality of horizontal pipes tends to become complicated, and when trying to change the cross-sectional area according to the exhaust volume, it is necessary to change the entire diameter, so there is a problem that standardization of peripheral components is difficult.

[0003] Also, as a chimney in which a horizontal pipe flow path extending from an exhaust source is connected to a main pipe flow path in a crossing direction, a configuration has been proposed in which the main pipe flow path is composed of a lower section and an upper section, the lower section is formed by a square tubular body, the upper section is formed by a cylindrical tubular body, and the upper end of the square tubular body and the lower end of the cylindrical tubular body are connected by a shape conversion joint (see Patent Document 1). In Patent Document 1, a horizontal connection port connected to a horizontal pipe forming a horizontal pipe flow path is provided on the side wall of the square tubular body, and the upper wall of the horizontal connection port is inclined to have a chamfered shape and joined to the side wall of the square tubular body.

[0004] However, in the configuration where the lower section has a square shape and the upper section has a circular shape as described above, when trying to set the cross-sectional area of the upper section according to the exhaust volume, it is necessary to change the diameter of the cylindrical tubular body, so it is not easy to set the cross-sectional area considering the standardization of peripheral components. Also, in a configuration where there are a plurality of horizontal pipes on the exhaust source side, a configuration for suppressing the flow path interference between the exhaust gases introduced from the horizontal pipes may be required.

Prior Art Documents

[0005] [Patent Document 1] Utility Model Registration No. 3237118 Gazette [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] The objective of this invention is to provide a chimney that ensures ease of connection of multiple horizontal pipes at the lowest point, suppresses the increase in exhaust resistance caused by the stagnation of exhaust gases inside the chimney, and further allows for easy setting of the flue cross-sectional area according to the exhaust volume, while considering the standardization of surrounding parts.

[0007] Furthermore, an objective of this invention is to provide a chimney that can suppress interference between the flow paths of exhaust gases introduced from each horizontal pipe in a configuration where multiple horizontal pipes exist on the exhaust source side.

[0008] Furthermore, the objective of this invention is to provide a chimney that allows for easy setting of the optimal flue cross-sectional area according to the exhaust volume while standardizing the use of parts. [Means for solving the problem]

[0009] The chimney according to the present invention is a chimney constructed by connecting a plurality of cylindrical chimney units in the vertical direction, comprising: a lower chimney unit to which a plurality of horizontal pipes for introducing exhaust gas from an exhaust source are connected; an upper chimney unit connected above the lower chimney unit; and a shape-changing joint connecting the lower chimney unit and the upper chimney unit, wherein the lower chimney unit has a flue formed by a chimney wall with a rectangular cross-section, and the upper chimney unit has a flue formed by a chimney wall with an oval cross-section having a pair of opposing arc-shaped portions in cross-section and a pair of opposing straight portions connecting the ends of each arc-shaped portion.

[0010] As a result, the lowest chimney unit has a rectangular cross-section, allowing the horizontal pipe to be guided through the flat chimney wall forming one side, making it easy to accommodate the horizontal pipe. At the same time, the upper chimney unit can form an oval-shaped flue without any corners inside the chimney, which reduces the accumulation of exhaust gases within the flue and enables efficient exhaust.

[0011] Furthermore, the flue cross-sectional area can be adjusted by changing the length of the straight section in the cross-section while maintaining a constant radius of curvature of the arc-shaped portion of the upper chimney unit. This makes it possible to easily set the cross-sectional area according to the exhaust volume by simply setting the dimensions of the components constituting the straight section, while keeping the components constituting the arc-shaped portion common.

[0012] Furthermore, the chimney according to the present invention is characterized in that the lowest chimney unit is equipped with a partition plate that divides the inside of the flue into a plurality of independent flues for each of the horizontal pipes.

[0013] This allows the exhaust gas introduced into the lowest chimney unit to be partitioned into multiple flues corresponding to each horizontal pipe, thereby suppressing interference and backflow of exhaust gas between the horizontal pipes.

[0014] Furthermore, the chimney according to the present invention is characterized in that the upper chimney unit is constructed by connecting a pair of arc-shaped chimney walls that constitute the pair of arc-shaped portions and a pair of flat chimney walls that constitute the pair of straight portions, and by changing the width dimension of the flat chimney walls while maintaining a constant radius of curvature of the arc-shaped chimney walls, the cross-sectional area corresponding to the exhaust volume is set.

[0015] This allows for the upper chimney unit to standardize the arc-shaped chimney wall by using a common radius of curvature, while freely adjusting the flue cross-sectional area simply by setting the width dimension of the flat chimney wall. [Effects of the Invention]

[0016] According to the present invention, in the lowermost chimney unit, a plurality of horizontal pipes are led and connected easily, ensuring workability, and in the upper chimney unit, the exhaust efficiency can be improved. Further, the flow path interference between the exhaust gases from the plurality of horizontal pipes can be suppressed, and it is easy to set the flue cross-sectional area according to the exhaust volume by utilizing the cross-sectional shape of the upper chimney unit.

Brief Description of the Drawings

[0017] [Figure 1] Schematic perspective view of a chimney according to an embodiment of the present invention [Figure 2] Schematic front view of a chimney according to an embodiment of the present invention [Figure 3] Schematic plan view according to an embodiment of the present invention [Figure 4] Cross-sectional view taken along line I-I according to an embodiment of the present invention [Figure 5] Cross-sectional view taken along line II-II according to an embodiment of the present invention [Figure 6] Cross-sectional view taken along line III-III according to an embodiment of the present invention

Mode for Carrying Out the Invention

[0018] Hereinafter, a chimney 100 according to an embodiment of the present invention will be described in detail with reference to the drawings. The chimney 100 of the present embodiment is suitably used for discharging the high-temperature and high-speed exhaust gas G discharged from an exhaust source such as an emergency gas turbine generator to the outside.

[0019] FIG. 1 is a schematic perspective view of a chimney 100 according to an embodiment of the present invention, FIG. 2 is a schematic front view of the chimney 100, and FIG. 3 is a schematic plan view. As shown in FIGS. 1, 2, and 3, the chimney 100 is constructed by connecting a plurality of cylindrical chimney units in the vertical direction. Specifically, the chimney 100 includes a lowermost chimney unit 10 located at the lowermost part, an upper chimney unit 20 disposed above it, and a shape conversion joint 30 connecting these two units. In FIGS. 1 and subsequent figures, the illustration is simplified for easier understanding of the configuration of the invention. That is, the heat insulation layer of each chimney wall of the chimney 100 is omitted. In addition, a plurality of upper chimney units 20 are connected in series in the vertical direction according to the actual installation situation and the height of the building, but only a part of them is shown omitted in the drawing. Similarly, for the horizontal pipes 40, 40, their connection form, shape, length dimensions, etc. are simplified and illustrated.

[0020] FIG. 4 is a sectional view taken along the line I-I of FIG. 3, showing the longitudinal section structure of the chimney 100. A plurality of horizontal pipes 40, 40 for introducing exhaust gas G from an exhaust source (not shown) are connected to the lowermost chimney unit 10. In the present embodiment, as an example, two horizontal pipes 40, 40 are connected to the lowermost chimney unit 10 through openings 12a, 12b provided in the chimney walls 11a, 11c of the lowermost chimney unit 10. At the tip of each horizontal pipe 40, 40, elbow-shaped bent pipes E, E having openings 40a, 40a are provided, and the exhaust gas G from the exhaust source is discharged from the openings 40a, 40a into the flue S1 of the lowermost chimney unit 10.

[0021] The shape conversion joint 30 has its lower end connected to the upper end of the lowermost chimney unit 10 and its upper end connected to the lower end of the upper chimney unit 20, and is a member that continuously changes the shape upward from the quadrangular cross-sectional flue of the lowermost chimney unit 10 to the oval cross-sectional flue of the upper chimney unit 20. Thereby, the cross-sectional shape continuously transitions from the lowermost chimney unit 10 side to the upper chimney unit 20 side, and the exhaust gas G can be smoothly guided to the upper chimney unit 20.

[0022] The lowest chimney unit 10 is equipped with partition plates 13 that divide the flue S1 of the lowest chimney unit into multiple independent flues for each horizontal pipe 40, 40. In this embodiment, the partition plates 13 divide the flue into two flues, S1a and S1b. This prevents backflow due to back pressure when only one exhaust source is operating during test runs, and suppresses turbulence in the airflow at the confluence and interference of exhaust gases G when all exhaust sources are operating. The exhaust gases G, G pass through the independent flues S1a and S1b within the lowest chimney unit 10, then merge at the shape-changing joint 30 and are led directly to the flue S2 of the upper chimney unit.

[0023] Figure 5 is a cross-sectional view taken along line II-II in Figure 2, showing the cross-sectional structure of the lowest chimney unit 10. The lowest chimney unit 10 is surrounded by chimney walls 11a, 11b, 11c, and 11d, forming a flue S1 with a rectangular cross-section. Because each chimney wall 11a, 11b, 11c, and 11d is planar, it is easier to form openings 12a and 12b for connecting the horizontal pipes 40, 40 and to arrange the pipes together, compared to the case of a cylindrical shape. Specifically, the chimney walls 11a and 11c, which form one of the planar surfaces of the lowest chimney unit 10, have openings 12a and 12b (see Figure 4) for horizontal pipes. The horizontal pipes 40, 40 are inserted through these openings 12a and 12b and connected to the internal flue S1. Exhaust gas G is released from the openings 40a, 40a at the ends of the pipes into the partitioned flues S1a and S1b of the flue S1 of the lowest chimney unit 10. Here, since the chimney walls 11a and 11c to be connected are planar, the complex interfacing of curved surfaces that occurs when connecting to a cylindrical wall is eliminated. As a result, the "fitting" process, such as filling, sealing, and fixing the gaps between the horizontal pipes 40, 40 and the chimney walls 11a and 11c, becomes easier and more reliable, improving construction accuracy and workability. Note that the connection positions of the horizontal pipes 40 are not limited to the illustrated example. Openings for horizontal pipes may be formed in any of the chimney walls 11a to 11d that make up the lowest chimney unit 10, and multiple horizontal pipes 40 may be connected to them. Alternatively, two horizontal pipes 40 may be connected to, for example, the chimney wall 11b.

[0024] Figure 6 is a cross-sectional view taken along line III-III in Figure 2, showing the cross-sectional structure of the upper chimney unit 20. The chimney wall constituting the upper chimney unit 20 has a pair of opposing arc-shaped portions in the cross-section, namely arc-shaped chimney walls 21a and 21b, and a pair of opposing straight portions connecting the ends of each arc-shaped portion, namely flat plate-shaped chimney walls 22a and 22b. This forms the flue S2, which as a whole has an oval cross-sectional shape. Because this oval-shaped flue S2 does not have corners like a square shape, exhaust gas G is less likely to accumulate, and exhaust efficiency equivalent to that of a circular cross-section can be maintained.

[0025] In this embodiment, the arc-shaped chimney walls 21a, 21b and the flat chimney walls 22a, 22b are independent components, and the upper chimney unit 20 is constructed by joining them. When calculating the flue cross-sectional area according to the exhaust volume in the design, the required cross-sectional area can be freely set by changing only the width dimension W of the pair of flat chimney walls 22a, 22b while maintaining the radius of curvature of the arc-shaped chimney walls 21a, 21b at a constant standard value. This makes it possible to accommodate chimneys with different exhaust capacities by simply changing the cutting dimensions of the flat chimney walls 22a, 22b while keeping the jigs and components used in the manufacture of the arc-shaped chimney walls 21a, 21b common. This enables rationalization of the overall chimney design and reduction of manufacturing costs. [Explanation of Symbols]

[0026] 100: Chimney 10: Bottom chimney unit 11a, 11b, 11c, 11d: Chimney wall 12a, 12b: Opening 13: Partition board 20: Upper chimney unit 21a, 21b: Arc-shaped chimney wall 22a, 22b: Flat chimney wall 30: Shape-changing joint 40: Horizontal pipe 40a:Aperture S1: Flue (lowest chimney unit) S1a, S1b: Flue (partitioned flue) S2: Flue (upper chimney unit) E: Bent pipe G: Exhaust gas W: Width dimension

Claims

1. A chimney constructed by connecting multiple cylindrical chimney units in a vertical direction, The lowest chimney unit is connected to multiple horizontal pipes that introduce exhaust gas from the exhaust source, An upper chimney unit is connected above the lowermost chimney unit, It includes a shape-changing joint that connects the lowermost chimney unit and the upper chimney unit, The lowermost chimney unit has a flue formed by a chimney wall with a rectangular cross-section. The chimney is characterized in that the upper chimney unit has a flue formed by a chimney wall with an oval cross-section, having a pair of opposing arc-shaped portions in its cross-section and a pair of opposing straight portions connecting the ends of each arc-shaped portion.

2. The chimney according to claim 1, characterized in that the lowest chimney unit is equipped with a partition plate that divides the inside of the flue into a plurality of independent flues for each of the horizontal pipes.

3. The upper chimney unit is constructed by joining a pair of arc-shaped chimney walls that constitute the pair of arc-shaped portions and a pair of flat chimney walls that constitute the pair of straight portions. The chimney according to claim 1 or 2, characterized in that the cross-sectional area corresponding to the exhaust volume is set by changing the width dimension of the flat chimney wall while maintaining a constant radius of curvature of the arc-shaped chimney wall.

Images