JP6830071B2 - chimney - Google Patents

Description

The present invention relates to a chimney having a peripheral wall having a structure in which a heat insulating material is loaded between a cylindrical inner cylinder having a vertical axis and an outer cylinder surrounding the inner cylinder, for example, driving an emergency generator. It relates to a chimney suitable as a large-diameter and long-sized chimney for guiding exhaust gas discharged from an exhaust gas source such as a gas turbine engine, a diesel engine, a boiler or an industrial waste incinerator to a high place and discharging it. ..

Conventionally, Patent Document 1 describes a cylindrical chimney devised so that the exhaust gas is swirled in the flue in order to improve the emission efficiency of the introduced exhaust gas. This chimney is shown in FIGS. 10 and 11.

In FIGS. 10 and 11, the chimney 50 is made of a reinforced concrete or steel plate cylinder, and includes an introduction pipe 52 that introduces exhaust gas discharged from an exhaust gas source (not shown) into the flue 51. A plurality of drift plates 53 made of flat metal plates are arranged at the outlet in a vertical posture with a predetermined interval facing diagonally forward, and an inclined surface 54 is formed at the bottom of the flue 51.

According to such a chimney 50, the exhaust gas discharged from the exhaust gas generation source is introduced into the flue 51 via the introduction pipe 52 and then converted into a swirling flow flowing along the inner peripheral surface of the chimney 50. It is said that the exhaust gas suction / discharge function possessed by the chimney 50 and the ascending force by the guidance of the inclined surface 54 are applied to this swirling flow, so that the exhaust gas can be discharged while swirling, and the exhaust gas discharge efficiency of the chimney 50 is enhanced. ing.

However, in the swirling flow conversion of the exhaust gas, the exhaust gas of a straight flow that is obliquely drifted on the projective plane by a plurality of drift plates 53 at the outlet of the introduction pipe 52 interferes linearly with the arcuate inner peripheral surface of the chimney 50. It is done by suddenly changing direction. Therefore, a large turning resistance is generated in the flue 51, which acts to attenuate the swirling flow and shortens the duration of the swirling flow.

On the other hand, this type of chimney has a large diameter (inner diameter of the chimney 50) of a large diameter (250 mm to 1500 mm) and a height of as long as 10 m. In such a large-diameter, long-sized chimney, it is necessary to extend the duration of the swirling flow in order to discharge the exhaust gas while swirling and improve the exhaust gas discharge efficiency. However, with the above technique, it is difficult to extend the duration of the swirling flow, and the swirling flow may disappear in the middle of ascending. Therefore, high exhaust gas emission efficiency cannot be expected.

Jitsukosho 63-44667

The present invention has been made in view of the above circumstances, and by extending the duration of the exhaust gas swirling flow, it is expensive not only for a chimney of normal specifications but also for a large-diameter and long-sized chimney. The purpose is to provide a chimney that can ensure the emission efficiency of exhaust gas.

In order to achieve the above object, the chimney according to the present invention is a chimney having a peripheral wall having a structure in which a heat insulating material is loaded between a cylindrical inner cylinder having a vertical axis and an outer cylinder surrounding the inner cylinder. The inner cylinder is provided with a flow conversion means for introducing the exhaust gas discharged from the exhaust gas source and converting the introduced exhaust gas into a swirling flow by changing the direction and discharging the exhaust gas to the flue in the peripheral wall . It is a spiral cylinder with spiral ribs consisting of semi-circular ridges that form a recessed semi-circular inner surface, and the flow conversion means is a straight portion on the upstream side into which exhaust gas is introduced and this. It is a round tube provided with a curved portion connected to the downstream side of the straight portion, the straight portion is inserted into the flue at right angles to the vertical axis of the inner cylinder, and the curved axis of the curved portion is the said. By inclining at an angle equal to the inclination angle of the spiral rib in the inner cylinder, the exhaust gas introduced into the straight portion is converted into a swirling flow along the curved inner surface of the curved portion of the curved portion. After being discharged from the discharge port into the flue, the semicircular inner surface formed by the spiral ribs is guided to maintain the swivel shape and ascend diagonally. It is something to do.

According to the chimney having the above configuration, the exhaust gas is converted into a swirling flow by the direction change made by the flow conversion means of the exhaust gas and discharged into the flue. As a result, a sudden change of direction due to interference with the arcuate inner peripheral surface of the peripheral wall is avoided, and the direction change resistance is remarkably reduced. Therefore, the attenuation of the swirling flow is relaxed, the duration of the swirling flow can be extended, and the exhaust gas emission efficiency can be improved.

Further, the exhaust gas flow conversion means is composed of a round pipe, and is connected to a straight portion on the upstream side into which the exhaust gas is introduced and a downstream side of the straight portion, and converts the exhaust gas into a swirling flow by changing the direction and discharges the exhaust gas. It is provided with a curved portion to be used.

According to this, the straight flow of the exhaust gas introduced into the straight part of the exhaust gas flow conversion means is converted into a swirling flow by a gentle and smooth direction change along the curved inner surface of the curved part and discharged to the flue. .. As a result, the exhaust gas flow conversion means has a simple structure, but avoids a sudden change of direction due to interference with the arcuate inner peripheral surface of the peripheral wall, significantly reduces the direction change resistance, and attenuates the swirling flow. It can be relaxed to extend the duration of the swirling flow and improve the exhaust gas emission efficiency.

In particular, the inner cylinder is a spiral cylinder having a spiral rib formed by a semicircular ridge facing outward in a cross section forming a recessed semicircular inner surface, and the flow conversion means introduces exhaust gas. It is a round tube including a straight portion on the upstream side and a curved portion connected to the downstream side of the straight portion, and the straight portion is inserted into the flue perpendicular to the vertical axis of the inner cylinder and described as described above. Since the curved axis of the curved portion is inclined at an angle equal to the inclination angle of the spiral rib in the inner cylinder, the exhaust gas introduced into the straight portion becomes a swirling flow along the curved inner surface of the curved portion. After being converted and discharged from the discharge port of the curved portion into the flue, the spiral inner surface formed by the spiral ribs keeps the swivel shape and rises diagonally. Because of the configuration, the swirl flow discharged into the flue can extend the duration of the swirl flow in the flue and contribute to improving the exhaust gas emission efficiency.

According to the chimney according to the present invention, sudden change of direction due to interference between the exhaust gas and the arcuate inner peripheral surface of the peripheral wall is avoided, and the direction change resistance is remarkably reduced, so that the damping of the swirling flow is alleviated and the swirling flow It is possible to extend the duration and improve the exhaust gas emission efficiency.

It is a front view which shows by omitting a part of one Embodiment of the chimney which concerns on this invention. It is a cross-sectional enlarged plan view along the line II-II of FIG. It is a front view which shows one Embodiment of an inner cylinder. (A) is a front view showing the original plate, (b) is an explanatory view of one hook-shaped bent portion, and (c) is an explanatory view of the other hook-shaped bent portion. It is sectional drawing which shows the goby hook and the spiral rib enlarged. It is a right side view which shows one embodiment of the lowest chimney unit enlarged. It is explanatory drawing which shows the installation state of the exhaust gas flow conversion means in the partial crossing plane along the VII-VII line of FIG. (A) is an explanatory plan view of the exhaust gas flow conversion means of FIG. 7. (B) is another embodiment of the exhaust gas flow conversion means. FIG. 8A is an explanatory view showing the inclination of the curved axis when the exhaust gas flow conversion means of FIG. 8A is rotated counterclockwise around the axis of the straight portion in a cross-sectional front along IX-IX. (B) is another embodiment of the exhaust gas flow conversion means, and the inclination of the curved axis when the exhaust gas flow conversion means of FIG. 8 (b) is rotated counterclockwise around the axis of the straight portion is IX. -It is explanatory drawing which shows in the crossing front along IX. It is a cross-sectional plan view of the conventional example. It is a vertical sectional side view of a conventional example.

Hereinafter, preferred embodiments of the chimney according to the present invention will be described with reference to the drawings. FIG. 1 is a front view showing an embodiment of a chimney according to the present invention with a part omitted, FIG. 2 is a cross-sectional enlarged plan view taken along line II-II of FIG. 1, and FIG. 3 shows an embodiment of an inner cylinder. It is a front view.

In FIGS. 1 and 2, in the chimney 1, a plurality of chimney units 1A, 1B, 1C having a vertical axis C are arranged vertically by a butt structure, and the chimney units 1A and 1B directly above and directly below each other and facing each other. It is constructed by joining 1B and 1C with a heat-resistant packing P interposed therebetween by a connecting means described later. The heat-resistant packing P is composed of a mat-like molded body of glass fiber exhibiting an annular shape.

Each chimney unit 1A, 1B, 1C includes a cylindrical inner cylinder 2 made of a stainless steel plate and an outer cylinder 3 made of a galvanized steel plate and surrounding the inner cylinder 2 around the vertical axis C. The annular space between the three is provided with a peripheral wall 5 loaded with a heat insulating material 4 made of a fibrous material such as rock wool, ceramic wool, or glass wool. In other words, the chimney 1 includes a peripheral wall 5 having a structure in which a heat insulating material 4 is loaded between a cylindrical inner cylinder 2 having a vertical axis C and an outer cylinder 3 surrounding the inner cylinder 2.

The connecting means 6 (see FIG. 1) applied in the present embodiment is configured by a flange joining structure. The flange joining structure is wound around the lower end portion of the outer cylinder 3 of each chimney unit 1A, 1B, 1C and the lower flange 6a fixed by welding (however, the lower end portion of the chimney unit 1C and the outer periphery of the lower end portion are wound around the lower end portion. The lower flange that has been fixed once is not shown) and the upper flange 6b that is wound around the outer periphery of the upper end of the outer cylinder 3 in each chimney unit 1A, 1B, 1C ... And fixed by welding (however, the upper end of the chimney unit 1A). The lower flange 6a and the upper flange 6b are placed at equal intervals in the circumferential direction with the heat-resistant packing P interposed between the portion and the upper flange wound and fixed to the outer periphery of the upper end portion (not shown). A plurality of vertical fastening members 6c composed of bolts and nuts to be fastened to each other are provided.

As shown in FIG. 3, the inner cylinder 2 of each chimney unit 1A, 1B, 1C and the lowermost chimney unit described later is composed of a spiral cylinder, and a pair of upper and lower spiral goby hooks 7 and these spiral gobies. It is provided with two spiral ribs 8 provided in parallel between the hooks 7, and the inclination angle θ of the spiral is set in the range of 15 degrees to 20 degrees (17 degrees in this embodiment). ..

FIG. 4A is a front view showing the original plate, FIG. 4B is an explanatory view of one hook-shaped bent portion, and FIG. 4C is an explanatory view.
Is an explanatory view of the other hook-shaped bent portion, and FIG. 5 is an enlarged cross-sectional explanatory view showing a goby hook and a spiral rib.

For the pair of upper and lower spiral spiral hooks 7 and the two spiral ribs 8 described with reference to FIG. 3, a diagonal strip-shaped original plate 90 made of the stainless steel plate shown in FIG. 4A is prepared by plate removal. One hook-shaped bent portion 91a shown in FIG. 4 (b) is formed at one end (left end) 91 in the width direction of the original plate 90 over the entire length in the longitudinal direction, and the width direction of the original plate 90 in FIG. 4 (a) is formed. The other hook-shaped bent portion 92a shown in FIG. 4 (c) is formed at the other end (right end) 92 over the entire length in the longitudinal direction, and one hook-shaped bent portion 92a is formed as shown in FIG. 4 (a). Two cross-sectional outward halves extending parallel to each other over the entire length of each hook-shaped bent portion 91a, 92a in the longitudinal direction with a predetermined interval between the bent portion 91a and the other hook-shaped bent portion 92a. As shown in FIG. 5, in synchronization with the progress of the process of forming the circular raised portion 93 and then applying the original plate 90 to the outer periphery of the cylindrical core type (not shown) and winding it in an appropriate spiral shape, as shown in FIG. As shown in FIG. 3, a pair of upper and lower parts made of so-called vertical instep spirals is formed by a method of advancing the step of vertically directing the one hook-shaped bent portion 91a and the other hook-shaped bent portion 92a and engaging them with each other. A spiral cylinder 2 having a spiral rib 8 composed of a spiral hook 7 and two raised portions 93 can be manufactured.

FIG. 6 is an enlarged right side view showing one embodiment of the lowest chimney unit, and FIG. 7 is an explanatory view showing an installation state of the exhaust gas flow conversion means on a partial cross-sectional plane along the VII-VII line of FIG. 8 (a) is an explanatory plan view of the exhaust gas flow conversion means of FIG. 7, FIG. 8 (b) is another embodiment of the exhaust gas flow conversion means, and FIG. 9 (a) is the exhaust gas of FIG. 8 (a). An explanatory view showing the inclination of the curved axis when the flow conversion means of No. 1 is rotated counterclockwise around the axis of the straight portion in a cross-sectional front along IX-IX, FIG. 9B shows other means of the exhaust gas flow conversion means. In the explanatory view showing the inclination of the curved axis when the exhaust gas flow conversion means of FIG. 8B is rotated counterclockwise around the axis of the straight portion in the cross-sectional front along the IX-IX. is there.

As shown in FIGS. 1, 6 and 7, the lowest chimney unit 1U in each chimney unit 1A, 1B, 1C constructing the chimney 1 is vertical to the horizontal pedestal 9a on the horizontal installation surface 9. It is erected in a posture. In the present embodiment, the chimney unit 1C is joined directly above the lowermost chimney unit 1U by the same connecting means 6 as described above.

As shown in FIGS. 6 and 7, in the vicinity of the lower end of the chimney unit 1U, a large-diameter, short-sized horizontal hole 12 communicating with the vertical flue 11 has a horizontal axis C2 orthogonal to the vertical axis C. The exhaust gas flow conversion means 13 is inserted into the flue 11 through the horizontal hole 12. Note that in FIG. 7, the spiral goby hook 7 and the spiral rib 8 are not shown.

The exhaust gas flow conversion means 13 is composed of a round pipe having a uniform inner diameter, and is connected to a straight portion 13A on the upstream side into which the exhaust gas is introduced and a straight portion 13A on the downstream side of the straight portion 13A, and turns the exhaust gas by changing the direction. It is provided with a substantially elbow-shaped curved portion 13B that is converted into a flow S and discharged from the flue 11, and is installed in a state where the axis C3 of the straight portion 13A is aligned with the horizontal axis C2 of the horizontal hole 12.

A flange 13a is provided at the upstream end of the straight portion 13A, and the flange 13a is the downstream end of the exhaust pipe 14 appropriately joined to the flange 12a provided at the inlet of the horizontal hole 12 and the exhaust port of the exhaust gas source whose upstream side is not shown. It is sandwiched between the flange 14a and the annular heat-resistant packing (not shown), and is mounted on the horizontal hole 12 by fastening them to each other with a plurality of horizontal fastening members 15 made of bolts and nuts. The substantially front half and the curved portion 13B are inserted into the flue 11, and the insertion portion is received and supported by a cradle 16 provided at the bottom of the chimney unit 1U.

In the projection plane shown in FIG. 8A, the discharge port 13b of the curved portion 13B in the present embodiment has the discharge end P1 of the curved axis C4 of the curved portion 13B and the discharge end downstream of the swirling flow S in the discharge direction. It is shown on a diagonal straight line L connecting the discharge ends P2 of the outer circular arc set unevenly on the side and the discharge ends P3 of the inner arc set unevenly distributed on the upstream side of the swirling flow S in the discharge direction from the discharge end P1. By applying the cutting edge of a cutting blade and unevenly distributing the peaks to the arrow X1 side with the cutting edge as the base point, the cutting blade is tilted at a predetermined tilt angle, and this tilt is maintained and the cutting blade is moved diagonally downward to cut. The installation of the exhaust gas flow conversion means 13 in the state shown in FIG. 7 is the center of the exhaust gas flow conversion means 13 shown in FIG. 8 (a), which is composed of a two-dimensional inclined surface. Rotate counterclockwise around the axis C3 of the straight portion 13A passing through O, and rotate the curved axis C4 of the curved portion 13B to the right at an inclination angle θ2 equal to the inclination angle θ (see FIG. 3) of the spiral in the inner cylinder 2. This can be achieved by tilting it upward. The discharge port 13b of the curved portion 13B is provided with the cutting edge of a cutting blade (not shown) on an oblique straight line L in the projective plane shown in FIG. 8B, and the cutting blade is moved downward vertically. It may be composed of a cut one-dimensional inclined surface. Also in this case, the straight portion 13A passing through the center O shown in FIG. 9B is rotated counterclockwise around the axis C3, and the curved axis C4 of the curved portion 13B is tilted by the spiral inclination angle θ in the inner cylinder 2. This can be achieved by inclining upward to the right at an inclination angle θ2 equal to (see FIG. 3).

According to the chimney 1 having the above configuration, the exhaust gas is converted into a swirling flow S by the direction change made by the exhaust gas flow conversion means 13, and is discharged to the flue 11, so that the exhaust gas is in contact with the arcuate inner peripheral surface of the peripheral wall 5. Sudden directional changes due to interference are avoided and the directional resistance is significantly reduced. As a result, the attenuation of the swirling flow S is relaxed, the duration of the swirling flow S can be extended, and the exhaust gas emission efficiency can be improved.

The exhaust gas flow conversion means 13 is composed of a round pipe having a uniform inner diameter, and is formed by welding or flange joining the straight portion 13A on the upstream side where the exhaust gas is introduced from the exhaust pipe 14 and the downstream side of the straight portion 13A. Since it is provided with a substantially elbow-shaped curved portion 13B that is connected in series and converts the exhaust gas into a swirling flow S by changing the direction and discharges the exhaust gas, the straight flow of the exhaust gas introduced from the exhaust pipe 14 to the straight portion 13A is , It is converted into a swirling flow S by a gentle and smooth direction change along the curved inner surface of the curved portion 13B, and is discharged to the flue 11. As a result, the exhaust gas flow conversion means 13 has a simple structure, but avoids a sudden change of direction due to interference with the arcuate inner peripheral surface of the peripheral wall 5, significantly reduces the direction change resistance, and makes the swirling flow S. It is possible to alleviate the attenuation of the exhaust gas, extend the duration of the swirling flow S, and improve the exhaust gas emission efficiency.

The inner cylinder 2 shown in FIG. 3 is not only increased in rigidity by the spiral ribs 8, but also each spiral rib 8 has two semicircular ridges 93 [see FIG. 4 (a). ], The swirling flow S discharged to the flue 11 guides the spiral ribs 8, that is, the concave semicircular inner surfaces of the semicircular ridges 93 outward in each cross section. By the guiding action, it is possible to maintain the swirling form and ascend diagonally, prolong the duration of the swirling flow S in the flue 11, and contribute to improving the exhaust gas emission efficiency.

The chimney 1 according to the present invention is not limited to the above-described embodiment, and can be structurally deformed as long as it does not deviate from the purpose and technical idea.

The chimney of the present invention is a large-diameter and long-sized chimney that guides and dissipates exhaust gas from a gas turbine engine or diesel engine that drives an emergency generator, exhaust gas from a boiler, or exhaust gas from an industrial waste incinerator to a high place. It is useful as a technique for improving the exhaust gas emission efficiency.

1 Chimney 2 Inner cylinder 3 Outer cylinder 4 Insulation material 5 Circumferential wall 8 Spiral rib 13 Exhaust gas flow conversion means 13A Straight part 13B Curved part
93 Cross-section outward semicircular ridge C Vertical axis
C4 Curved axis S swirling flow
θ spiral tilt angle

Claims (1)

In a chimney having a peripheral wall having a structure in which a heat insulating material is loaded between a cylindrical inner cylinder having a vertical axis and an outer cylinder surrounding the inner cylinder.
The exhaust gas discharged from the exhaust gas source is introduced, and the introduced exhaust gas is converted into a swirling flow by changing the direction to provide a flow conversion means for the exhaust gas discharged to the flue in the peripheral wall, and the inner cylinder is concave. It is a spiral cylinder with spiral ribs consisting of semicircular ridges facing outward in cross section that form the inside semicircular inner surface.
The flow conversion means is a round pipe including a straight portion on the upstream side into which exhaust gas is introduced and a curved portion continuously provided on the downstream side of the straight portion, and the straight portion is orthogonal to the vertical axis of the inner cylinder. The exhaust gas introduced into the straight portion is discharged by being inserted into the flue and having the curved axis of the curved portion inclined at an angle equal to the inclination angle of the spiral rib in the inner cylinder. After being converted into a swirling flow along the curved inner surface of the curved portion and discharged to the flue from the discharge port of the curved portion, the swirling form is formed by the guiding action of the semicircular inner surface formed by the spiral ribs. A chimney characterized by being configured to hold and rise diagonally .

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