Chimney

Abstract

To provide a chimney capable of improving exhaust efficiency.SOLUTION: The chimney 100 has a pipeline through which the exhaust gas flows from the secondary pipe B to the main pipe A. The main pipe A is diametrically larger than the auxiliary pipe B, and the axis P1 of the auxiliary pipe B crosses the axis P2 of the main pipe A at an angle smaller than a right angle.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a chimney, and in particular to a chimney suitable for treating exhaust emissions from multiple exhaust sources. [Background technology]

[0002] In chimneys that process exhaust from exhaust sources such as gas turbines, diesel engines, boilers, and waste incinerators installed in buildings, the exhaust from the exhaust source is directed through an exhaust pipe to a horizontal pipe, which then directs the exhaust to the chimney body, which forms an upward flue. This type of chimney can have either a single exhaust route from the exhaust source or multiple routes. In chimneys with multiple exhaust routes, the exhaust from each route can be collected into a single horizontal pipe and directed to a single chimney body.

[0003] Prior art 1 (Patent Document 1) describes an exhaust gas duct system for a gas turbine. In this system, exhaust gas from two exhaust sources, a gas turbine and a generator, is introduced into a double duct through separate exhaust gas ducts, and then passes through two separate flow paths within the double duct, where the exhaust gases are collected in a junction duct and introduced into the core of a chimney. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 64-57021 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the exhaust gas duct system shown in Patent Document 1, if exhaust from more than two exhaust sources is to be treated, it is necessary to increase the number of partitioned flow paths inside the double-line duct in accordance with the number of exhaust sources, which is thought to be a problem in that the double-line duct ends up becoming unnecessarily large.

[0006] The present invention has been made in view of the above circumstances, and aims to provide a chimney that is suitable for treating exhaust gases emitted from a plurality of exhaust sources, and that is capable of improving exhaust efficiency. [Means for solving the problem]

[0007] The chimney according to the present invention is a chimney having a pipe through which exhaust gas flows from a secondary pipe to a main pipe, The inside diameter of the main pipe is larger than the inside diameter of the secondary pipe, and the secondary pipe is connected to the main pipe in a form in which the axis of the secondary pipe intersects the axis of the main pipe at an angle less than right angles, and the axis of the secondary pipe intersects the axis of the main pipe without sharing the same plane. With a chimney configured in this way, it is easy to connect multiple secondary pipes to the main pipe, and the exhaust introduced from the secondary pipes to the main pipe exerts a propulsion effect, improving exhaust efficiency. Furthermore, increasing the number of secondary pipes does not result in an increase in the size of the main pipe.

[0008] Furthermore, since the axis of the secondary pipe intersects with the axis of the main pipe without sharing the same plane, the exhaust gas introduced from the secondary pipe to the main pipe becomes a swirling flow and flows through the main pipe, and the above-mentioned propulsive action of the exhaust gas and the suppression effect of exhaust resistance due to the swirling flow work together to improve exhaust efficiency.

[0009] In the present invention, it is desirable that the crossing angle of the axis of the secondary pipe relative to the axis of the main pipe is 35 to 30 degrees. According to this, taking into consideration manufacturing technology and the suppression effect of exhaust resistance, if the crossing angle θ of the axis P2 of the secondary pipe B relative to the axis P1 of the main pipe A is 35 to 30 degrees, exhaust resistance can be suppressed while also being able to be handled in terms of manufacturing technology.

[0010] In the present invention, it is possible to adopt a configuration in which the main pipe is a horizontal pipe that leads exhaust to the chimney body forming the upward flue, and the secondary pipe is an exhaust pipe that leads exhaust from the exhaust source to this horizontal pipe. In this way, the propulsive action of the exhaust and the suppression of exhaust resistance due to the swirling flow are exerted inside the horizontal pipe.

[0011] In addition, the present invention can also employ a configuration in which the chimney body forming the upward flue forms the main pipe, and the exhaust pipe that leads the exhaust from the exhaust source to the chimney body forms the secondary pipe. In this way, the above-mentioned exhaust propulsion action and the exhaust resistance suppression action due to the swirling flow are exerted inside the chimney body.

[0012] In the present invention, it is possible to adopt a configuration in which multiple secondary pipes whose axes do not share the same plane are connected to a main pipe, and by adopting this configuration, it becomes possible to efficiently treat exhaust from multiple exhaust sources. [Effects of the Invention]

[0013] The chimney according to the present invention is suitable for treating exhaust from a plurality of exhaust sources, and can improve exhaust efficiency. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a schematic perspective view showing an embodiment of a chimney according to the present invention. [Figure 2] FIG. 2 is a view taken along the arrow II in FIG. [Figure 3] FIG. 3 is a view taken along the arrow III in FIG. [Figure 4] FIG. 4 is a schematic perspective view showing a second embodiment of a chimney according to the present invention. [Figure 5] FIG. 5 is a view taken along the arrow V in FIG. 4. [Figure 6] FIG. 6 is a view taken along arrow VI in FIG. 4. [Figure 7] FIG. 10 is a schematic front view showing a third embodiment of the chimney according to the present invention. [Figure 8]FIG. 10 is a schematic front view showing a fourth embodiment of the chimney according to the present invention. [Figure 9] FIG. 10 is a schematic front view showing a chimney according to a comparative example. [Figure 10] FIG. 10 is a schematic plan view of the chimney of FIG. [Figure 11] FIG. 2 is an explanatory diagram showing a specific example of the configuration of an exhaust pipe. [Figure 12] 10 is a graph showing the axial flow velocity distribution of exhaust gas inside the main pipe. [Figure 13] 1 is a graph showing a comparison of the flow rate of a side-end chimney and a center chimney inside a main pipe. DETAILED DESCRIPTION OF THE INVENTION

[0015] FIG. 1 is a schematic perspective view showing a first embodiment of a chimney 100 according to the present invention, FIG. 2 is a view taken along the line II in FIG. 1, and FIG. 3 is a view taken along the line III in FIG.

[0016] The chimney 100 of the first embodiment comprises a chimney body 10 forming an upward flue 11, a horizontal pipe 20 that guides exhaust to the chimney body 10, and two exhaust pipes 30, 30 that guide exhaust from an exhaust source (not shown) to the horizontal pipe 20.

[0017] In this chimney 100, the horizontal pipe 20 forms the main pipe A according to the present invention, and the exhaust pipe 30 forms the secondary pipe B according to the present invention. Therefore, this chimney 100 has a pipe path in which exhaust G flows from the secondary pipe B, which is the exhaust pipe 30, to the main pipe A, which is the horizontal pipe 20. As shown in FIG. 2, the inner diameter D1 of the main pipe A is larger than the inner diameter D2 of the secondary pipe B. As shown in FIG. 3, the secondary pipe B is connected to the main pipe A so that the axis P2 of the secondary pipe B intersects with the axis P1 of the main pipe A at an angle θ that is smaller than a right angle. Furthermore, as shown in FIG. 2, the axis P2 of the secondary pipe B intersects with the axis P1 of the main pipe A without sharing the same plane. In other words, the axis P2 of the secondary pipe B is shifted by a distance a in the radial direction of the main pipe A from the axis P1 of the main pipe A. Here, the intersection angle θ between the axis P1 of the main pipe A and the axis P2 of the secondary pipe B is referred to as the "intersection angle θ," and the above-mentioned displacement distance a is referred to as the "displacement width a."

[0018] 1 to 3, when the axis P2 of the secondary pipe B intersects with the axis P1 of the main pipe A at an intersection angle θ and the axis P2 of the secondary pipe B is misaligned with the axis P1 of the main pipe A by a distance a, the axis P1 of the main pipe A and the axis P2 of the secondary pipe B cannot be on the same plane; in other words, they are in a skewed relationship and cannot share the same plane. In the first embodiment shown in FIGS. 1 to 3, the two secondary pipes B are provided at two locations that are rotationally symmetric about the axis P1 of the main pipe A. The axes of the two secondary pipes B do not share the same plane and are in a skewed relationship.

[0019] FIG. 4 is a schematic perspective view showing a second embodiment of the chimney 100 according to the present invention, FIG. 5 is a view taken along the arrow V in FIG. 4, and FIG. 6 is a view taken along the arrow VI in FIG.

[0020] The chimney 100 of the second embodiment comprises a chimney body 10 forming an upward flue 11, a horizontal pipe 20 that guides exhaust G to the chimney body 10, and one exhaust pipe 30 that guides exhaust G from an exhaust source (not shown) to the horizontal pipe 20.

[0021] In this chimney 100, as explained with reference to FIGS. 1 to 3, the horizontal pipe 20 forms the main pipe A according to the present invention, and the exhaust pipe 30 forms the secondary pipe B according to the present invention. Therefore, this chimney 100 has a pipe path through which exhaust G flows from the secondary pipe B, which is the exhaust pipe 30, to the main pipe A, which is the horizontal pipe 20. Also, as explained with reference to FIGS. 1 to 3, the inner diameter D1 of the main pipe A shown in FIG. 5 is larger than the inner diameter D2 of the secondary pipe B. Also, as shown in FIG. 6, the secondary pipe B is connected to the main pipe A in such a manner that the axis P2 of the secondary pipe B intersects with the axis P1 of the main pipe A at an intersection angle θ that is smaller than a right angle. Furthermore, the axis P2 of the secondary pipe B is misaligned with the axis P1 of the main pipe A by a misalignment width a.

[0022] As in the second embodiment shown in Figures 4 to 6, when the axis P2 of the secondary pipe B intersects with the axis P1 of the main pipe A at an intersection angle θ and the axis P2 of the secondary pipe B has a positional deviation width a with respect to the axis P1 of the main pipe A, it can be said that, as explained with reference to Figures 1 to 3, the axis P1 of the main pipe A and the axis P2 of the secondary pipe B cannot exist on the same plane, in other words, they are in a twisted position where they cannot share the same plane.

[0023] 7 is a schematic front view showing a third embodiment of a chimney 100 according to the present invention. The chimney 100 according to the third embodiment includes a chimney body 10 that forms an upward flue, and two exhaust pipes 30, 30 that guide exhaust from an exhaust source (not shown) to the chimney body 10.

[0024] In this chimney 100, the chimney body 10 forms the main pipe A according to the present invention, and the exhaust pipe 30 forms the secondary pipe B according to the present invention. Therefore, this chimney 100 has a pipe path through which exhaust gas flows from the secondary pipe B, which is the exhaust pipe 30, to the main pipe A, which is the chimney body 10. Although not shown, in this chimney 100 as well, the inner diameter of the main pipe A, which is formed by the chimney body 10, is larger than the inner diameter of the secondary pipe B, which is formed by the exhaust pipe 30. Furthermore, the axis P1 of the main pipe A and the axis P2 of the secondary pipe B intersect at an intersection angle θ, and the axis P1 of the main pipe A and the axis P2 of the secondary pipe B are misaligned by a certain amount corresponding to the misalignment amount a shown in Figures 2 and 5. Therefore, the axis P1 of the main pipe A and the axis P2 of the secondary pipe B cannot be on the same plane; in other words, they are in a twisted relationship and cannot share the same plane. In this third embodiment, too, two secondary pipes B, B are provided at two locations on the main pipe A that are rotationally symmetric about the axis P1.

[0025] 8 is a schematic front view showing a fourth embodiment of a chimney 100 according to the present invention. The chimney 100 according to the fourth embodiment includes a chimney body 10 that forms an upward flue, and one exhaust pipe 30 that guides exhaust from an exhaust source (not shown) to the chimney body 10.

[0026] In this chimney 100, the chimney body 10 forms the main pipe A according to the present invention, and the exhaust pipe 30 forms the secondary pipe B according to the present invention. Therefore, this chimney 100 has a pipe path through which exhaust gas flows from the secondary pipe B, which is the exhaust pipe 30, to the main pipe A, which is the chimney body 10. Although not shown, in this chimney 100 as well, the inner diameter of the main pipe A, which is formed by the chimney body 10, is larger than the inner diameter of the secondary pipe B, which is formed by the exhaust pipe 30. Furthermore, the axis P1 of the main pipe A and the axis P2 of the secondary pipe B intersect at an intersection angle θ, and the axis P1 of the main pipe A and the axis P2 of the secondary pipe B are misaligned by a certain amount corresponding to the misalignment amount a shown in Figures 2 and 5. Therefore, the axis P1 of the main pipe A and the axis P2 of the secondary pipe B cannot be on the same plane; in other words, they are in a twisted relationship and cannot share the same plane.

[0027] FIG. 9 is a schematic front view showing a chimney 100 (comparative example) for comparison, and FIG. 10 is a schematic plan view of the same.

[0028] The chimney 100 of the comparative example shown in Figures 9 and 10 comprises a chimney body 10 forming an upward flue, a horizontal pipe 20 that guides exhaust to the chimney body 10, and two exhaust pipes 30, 30 that guide exhaust from an exhaust source (not shown) to the horizontal pipe 20.

[0029] In this chimney 100, the horizontal pipe 20 forms the main pipe A according to the present invention, and the exhaust pipe 30 forms the secondary pipe B according to the present invention. Therefore, this chimney 100 has a pipe path through which exhaust gas flows from the secondary pipe B, which is the exhaust pipe 30, to the main pipe A, which is the horizontal pipe 20. As shown in FIG. 9 , the inner diameter D1 of the main pipe A is larger than the inner diameter D2 of the secondary pipe B. Furthermore, as shown in FIG. 10 , the axis P1 of the main pipe A and the axis P2 of the secondary pipe B intersect at an intersection angle θ. In these respects, there is no difference between the chimney 100 according to the comparative example shown in FIGS. 9 and 10 and the chimney according to the present invention. However, in the chimney 100 according to the comparative example, as shown in FIG. 9 , there is no misalignment width a, as shown in FIGS. 2 and 5 , between the axis P1 of the main pipe A and the axis P2 of the secondary pipe B. As in this comparative example, the axis P2 of the secondary pipe B intersects with the axis P1 of the main pipe A at an intersection angle θ, but when there is no misalignment between the axis P1 of the main pipe A and the axis P2 of the secondary pipe B, the axis P1 of the main pipe A and the axis P2 of the secondary pipe B can be said to be in a relationship where they can exist on the same plane, in other words, they can share the same plane (they are not in twisted positions).In this comparative example, too, the two secondary pipes B, B are provided at two locations that are rotationally symmetric about the axis P1 of the main pipe A.

[0030] 11 is an explanatory diagram showing a specific example of the configuration of a secondary pipe B that can be preferably applied to the chimney 100 according to the present invention. As shown in the figure, the secondary pipe B is divided into a short branch pipe B1 connected to the main pipe A and a secondary pipe body B2, and both B1 and B2 are flange-connected to each other. According to this configuration example, the main pipe A and the secondary pipe B can be easily connected.

[0031] In each of the first to fourth embodiments described above, the axis P2 of the secondary pipe B intersects with the axis P1 of the main pipe A at an intersection angle θ, and the axis P2 of the secondary pipe B is misaligned with the axis P1 of the main pipe A by a distance a, so that the axis P1 of the main pipe A and the axis P2 of the secondary pipe B cannot share the same plane. The chimney 100 in this state is referred to as a "side-end type chimney 100." In contrast, in the comparative example shown in Figures 9 and 10, the axis P2 of the secondary pipe B intersects with the axis P1 of the main pipe A at an intersection angle θ, but there is no misalignment between the axis P1 of the main pipe A and the axis P2 of the secondary pipe B, meaning that the axis P1 of the main pipe A and the axis P2 of the secondary pipe B can share the same plane. The chimney 100 in this state is referred to as a "central type chimney 100."

[0032] Next, the exhaust flow in the side-end chimney 100 and the central chimney 100 will be considered.

[0033] In the side-end type chimney 100 shown in each of the first to fourth embodiments, the axis P2 of the secondary pipe B intersects with the axis P1 of the main pipe A at an intersection angle θ, and the axis P2 of the secondary pipe B has a positional deviation width a with respect to the axis P1 of the main pipe A, so that the axis P1 of the main pipe A and the axis P2 of the secondary pipe B cannot share the same plane.As a result, it is presumed that the exhaust gas introduced from the secondary pipe B to the main pipe A tends to become a swirling flow along the inner surface of the main pipe A, and furthermore, exerts a propulsive effect toward the downstream side. In contrast to this, in the center-type chimney 100 shown in the comparative example, although the axis P2 of the secondary pipe B intersects with the axis P1 of the main pipe A at an intersection angle θ, there is no misalignment between the axis P1 of the main pipe A and the axis P2 of the secondary pipe B, i.e., the axis P1 of the main pipe A and the axis P2 of the secondary pipe B are in a relationship in which they can share the same plane, which is thought to cause the exhaust gas introduced from the secondary pipe B to the main pipe A to exert a propulsive action downstream, but it is thought to be inferior to the side-end type chimney 100 in that the exhaust gas tends to become a swirling flow along the inner surface of the main pipe A. From this, it can be inferred that the side-end type chimney 100 will surpass the central type chimney 100 in terms of exhaust efficiency.

[0034] Therefore, the axial exhaust flow velocity distribution (wind speed distribution) inside the main pipe A was compared between the side-end type chimney 100 and the central type chimney 100, and the results are shown in Figure 12. Figure 12 is a graph showing the axial exhaust flow velocity distribution inside the main pipe A, with the vertical axis representing wind speed and the horizontal axis representing radius (distance from the subjective central axis), and measurements were taken using a hot wire anemometer with a probe installed inside the main pipe. According to this, the exhaust flow velocity is fastest at the center of the main pipe A for both the side-end type chimney 100 and the central type chimney 100, and tends to slow down the further away from the center. Furthermore, the flow velocity at the center and nearby points of the main pipe A is faster for the side-end type chimney 100 than for the central type chimney 100, and the flow velocity at points near the inner surface and away from the center of the main pipe A tends to be even faster for the side-end type chimney 100.

[0035] Furthermore, the exhaust flow rate inside the main pipe A, calculated for each operating pattern of the inverter frequency combination that controls the fan, was compared between the side-end type chimney 100 and the central type chimney 100, and the results are shown in Figure 13. Figure 13 is a graph showing a comparison of the flow rate inside the main pipe A for the side-end type chimney 100 and the central type chimney 100. This shows that, regardless of the operating pattern of the fan, the side-end type chimney 100 tends to have a higher exhaust flow rate than the central type chimney 100. This means that the side-end type chimney 100 is superior to the central type chimney 100 in terms of exhaust efficiency.

[0036] In each of the first to fourth embodiments described above, cases have been described in which one or two secondary pipes B are connected to the main pipe A, but it is also possible to connect more than two secondary pipes B to the main pipe A within the scope of the present invention. [Explanation of symbols]

[0037] A master B Secondary pipe D1 Inner diameter of main pipe D2 Inner diameter of secondary pipe P1 Main pipe axis P2 Sub-pipe axis θ Intersection angle (intersection angle between the axis of the main pipe and the axis of the secondary pipe) a) The deviation of the axis of the secondary pipe from the axis of the main pipe 10 Chimney body 11 Upward flue 20 Horizontal pipe 30 exhaust pipe 100 Chimney

Claims

1. A chimney having a pipe through which exhaust flows from a secondary pipe to a main pipe, The secondary pipe is connected to the main pipe in such a manner that the inner diameter of the main pipe is larger than the inner diameter of the secondary pipe, and the axis of the secondary pipe intersects with the axis of the main pipe at an angle smaller than a right angle, A chimney characterized in that the axis of the secondary pipe intersects with the axis of the main pipe without sharing the same plane.

2. 2. The chimney according to claim 1, wherein the angle at which the axis of the secondary pipe intersects with the axis of the main pipe is 35 to 30 degrees.

3. A chimney as described in claim 1 or claim 2, wherein a horizontal pipe that leads exhaust to a chimney body that forms an upward flue forms the main pipe, and an exhaust pipe that leads exhaust from an exhaust source to this horizontal pipe forms the secondary pipe.

4. 3. A chimney according to claim 1 or claim 2, wherein the chimney body forming an upward flue forms the main pipe, and the exhaust pipe that leads exhaust from an exhaust source to the chimney body forms the secondary pipe.

5. 3. The chimney according to claim 1 or 2, wherein a plurality of secondary pipes, the axes of which do not share the same plane, are connected to the main pipe.

Images