JP3226204U - chimney - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chimney which effectively swirls exhaust gas flowing through an exhaust passage to enhance exhaust efficiency. SOLUTION: An exhaust guide vane 10 that impinges an exhaust flow F to give a swirling action is provided in a flue 120. The exhaust guide vane 10 uses a metal plate 20 forming a spiral shape, and the spiral center axis C of the plate 20 is arranged along the center axis C1 of the flue 120. The spirally extending outer peripheral end surface 21 of the plate body 20 is brought into contact with the inner peripheral surface 111 of the cylindrical wall 110 of the chimney 100. [Selection diagram] Figure 1

Description

  The present invention relates to a chimney for raising an exhaust flow such as exhaust gas or exhaust gas sent from an exhaust source to a flue formed by an inner space of a cylinder wall and discharging the same to the outside.

  Conventionally, in a cylindrical chimney, in order to improve the exhaust efficiency of the exhaust flow introduced into the flue, a device has been proposed in which the exhaust flow is swirled in the flue (for example, see Patent Document 1). ). In the chimney disclosed by Patent Document 1, a plurality of flat deflector plates are vertically arranged at a predetermined interval at the exit of a laterally-directed introduction pipe for introducing an exhaust flow sent from an exhaust source into a flue. Is arranged diagonally to the front, and an inclined surface is formed at the bottom of the flue.

  According to such a chimney, the exhaust flow sent from the exhaust generation source is converted from a lateral direction to an upward direction, converted into a swirl flow by the action of the above-mentioned flow diverter plate, and introduced into the flue. It is said that, as a result, the exhaust flow introduced into the flue swirls up the flue while swirling to increase the exhaust efficiency (exhaust efficiency) of the chimney.

Japanese Utility Model Publication No. 63-44667

  However, in the chimney proposed by Patent Document 1, the exhaust flow is converted from a lateral direction to an upward direction and is converted into a swirl flow by the action of the deflector plate, so that a large resistance that obstructs the flow of the exhaust flow is generated. It is considered that the momentum of the swirling flow is generated and attenuated within a short time after the generation.

  On the other hand, this kind of chimney has a large diameter (250 mm to 1500 mm) in diameter (the inner diameter of the chimney) and a long size that reaches a height of 10 m or more. In large chimneys, it has been found to be beneficial to extend the duration of the rising swirl flow in the flue in order to expel the exhaust flow while swirling it to increase exhaust efficiency. However, in the above technique, the swirl flow is maintained only within a certain time after the exhaust flow is introduced from the outlet of the introduction pipe to the lower region of the flue, and the swirl flow is maintained in the middle region and the upper region of the flue. The momentum of the flow tends to have diminished. For this reason, there is a problem in that the duration of the swirling flow with strong momentum in the flue cannot be maintained so long, and it is not possible to expect so much to achieve high exhaust efficiency.

  The present invention has been made in view of the above circumstances, and imparts a swirling action to an exhaust flow that rises up a flue in the middle of the flue, regardless of whether the chimney is small or large. The purpose of the present invention is to provide a chimney in which exhaust efficiency can be easily improved by allowing the air to be guided upward.

  The chimney according to the present invention is a chimney for raising an exhaust flow discharged from an exhaust source to a flue formed by an inner space of a cylindrical tube wall and discharging the flue to the outside. Is provided with exhaust guide vanes that collide with the exhaust flow rising up the flue to impart a swirling action to the exhaust flow, and the exhaust guide vanes are made of a metal plate body forming a spiral shape. It is said that the spiral central axis of this plate is arranged along the central axis of the flue. Further, in this chimney, it is desirable to adopt a configuration in which the spirally extending outer peripheral end surface of the plate body is in contact with the inner peripheral surface of the cylindrical wall.

  According to the chimney configured as described above, at the location where the exhaust guide vanes are installed, the exhaust flow rising up the flue collides with the metal plate forming the spiral shape and then along the plate. Ascend while turning. Therefore, the exhaust flow that rises up the flue is converted into a swirl flow without any great resistance at the location where the exhaust guide vanes are installed, rises, and rises after passing through the location where the exhaust guide vanes are installed. The flow continues for a certain period of time, and the reaching distance according to the duration is obtained. The duration of the swirling flow and the length of the reaching distance are affected by the axial length and spiral pitch of the spiral plate, the width of the plate, etc., but the axial length and spiral pitch of the plate, Adjusting the width is easy. Therefore, according to this chimney, it is possible to lengthen the duration of the swirling flow with strong momentum in the flue and extend the reach of the swirling flow, and improve the exhaust efficiency of the exhaust flow discharged to the outside. Cheap. In particular, if a configuration is adopted in which the outer peripheral end surface of the plate member that extends in a spiral shape is in contact with the inner peripheral surface of the cylindrical wall, the plate member is The exhaust flow, which has been swirled by the swirling action, is also guided in the circumferential direction by the inner peripheral surface of the cylinder wall, which also lengthens the duration of the swirling flow with strong momentum in the flue gas and Extending the reach helps to increase the exhaust efficiency of the exhaust flow discharged to the outside.

  As described above, according to the chimney according to the present invention, a metal plate body having a spiral shape is formed as an exhaust guide vane that collides an exhaust flow rising in a flue and imparts a swirling action to the exhaust flow. Since the exhaust guide vanes are used, the structure of the exhaust guide vanes is simplified by a single component of the plate body, and the manufacturing cost and the installation cost of the exhaust guide vanes are low. Nevertheless, it is possible to easily lengthen the duration of the swirling flow having a strong momentum in the flue, and it is possible to increase the exhaust efficiency of the exhaust flow discharged to the outside.

FIG. 3 is a partially cutaway perspective view illustrating an essential part of the chimney according to the embodiment of the present invention. It is a cross-sectional top view of the principal part of the chimney of FIG.

  Hereinafter, the present invention will be described with reference to embodiments. FIG. 1 is a partially cutaway perspective view illustratively showing a main part of a chimney according to an embodiment of the present invention, and FIG. 2 is a cross-sectional plan view of the main part of the chimney of FIG.

  The chimney 100 shown in FIG. 1 and FIG. 2 is installed in a stairwell as a chimney building space having an opening provided in a slab (floor) on each floor of a building frame. In the chimney 100 of this type, the lower end is connected to the outlet of a lateral introduction pipe extending from an exhaust gas generation source such as a gas turbine installed in a building, a diesel engine, a boiler, or a waste incinerator. The upper end is projected onto the roof of the building. Further, generally, the chimney 100 is constructed by connecting a plurality of units each having a cylindrical cylindrical wall 110 having a length of about 6 m in a stacking manner. Although the individual cylinder wall 110 is generally provided with an outer cylinder and an inner cylinder made of steel plates on both inside and outside of the heat insulation tank, the cylinder wall 110 is simplified to have a single-layer structure in the illustrated example. It is shown as a thing. In the chimney 100, the exhaust flow F rises up the flue 120 formed by the inner space of the cylinder wall 110, and then is discharged from the upper end of the chimney 100 to the outside.

  An exhaust guide vane 10 is provided on the flue 120 to impinge the exhaust flow F rising up the flue 120 to impart a swirling action to the exhaust flow F. The exhaust guide vane 10 is composed of a metal plate body 20 forming a spiral shape. As an example of a method of manufacturing such a spiral plate 20, a donut-shaped plate made of a metal plate is cut at one position in the circumferential direction, and one end and the other end of the plate facing each other at the cut. There may be mentioned a method of applying a tensile force in the direction opposite to the axial direction to the portion and stretching the portion in the axial direction. The exhaust guide vane 10 manufactured by this method is a single component of the metal plate body 20 forming a spiral shape. As the plate body 20, a steel plate having excellent durability in a high temperature environment such as a stainless steel plate can be preferably used.

  In this embodiment, the spiral plate 20 is interposed at a predetermined position in the height direction of the flue 120 as shown in FIG. 1 or 2. At the interposition of the plate body 20, the straight spiral center axis line C of the plate body 20 is arranged on the center axis line C1 of the flue 120 so as to be along the center axis line C1. Further, the spiral diameter dimension of the spiral plate body 20 is set to a dimension corresponding to the inner peripheral diameter of the cylindrical tubular wall 110 shown in FIG. 1 or 2. Therefore, as can be seen from FIG. 1 or 2, in the spiral plate body 20, the outer peripheral end surface 21 that extends in a spiral shape is in contact with the inner peripheral surface 111 of the cylindrical wall 110. The plate body 20 has its outer peripheral end surface 21 joined to the steel plate forming the inner peripheral surface of the cylindrical wall 110 by an appropriate means such as welding or bolting.

  According to the chimney 100 according to this embodiment, at the installation location of the exhaust guide vanes 10 formed by the spiral plate body 20, the exhaust flow F rising up the flue 120 is made of a metal plate forming a spiral shape. After colliding with the body 20, it rises while turning along the plate body 20. Therefore, the exhaust flow F rising in the flue 120 is converted into a swirl flow without difficulty at the installation location of the exhaust guide vane 10 and rises, and passes through the installation location of the exhaust guide vane 10. After that, the swirling flow continues for a certain period of time, and the reaching distance according to the duration is obtained. The duration of the swirling flow and the length of the reaching distance are affected by the axial length and spiral pitch of the spiral plate 20, the width of the plate, and the like, but the axial length of the plate 20 and the spiral. It is easy to adjust the pitch and width. Therefore, according to this chimney 100, the duration of the swirling flow with strong momentum in the flue 120 can be lengthened to extend the reach of the swirling flow, and the exhaust gas discharged to the outside can be exhausted. Easy to increase efficiency. In particular, when the configuration in which the outer peripheral end surface 21 of the plate body 20 that extends in a spiral shape is in contact with the inner peripheral surface 111 of the cylindrical wall 110 as in this embodiment, the exhaust guide blade 10 is installed. At the location, the exhaust flow given the swirling action by the plate body 20 is also guided in the circumferential direction by the inner peripheral surface of the cylindrical wall 110, and this also causes a strong swirling flow in the flue 120. By increasing the duration and extending the reach of the swirling flow, it is possible to improve the exhaust efficiency of the exhaust flow discharged to the outside.

  In this embodiment, the exhaust guide vanes 10 may be provided in a plurality of positions in the flue 120 in multiple stages, and in doing so, the exhaust efficiency of the exhaust flow discharged to the outside is further enhanced. Further, in the above-described embodiment, an example in which the present invention is applied to a large chimney 100 installed in a stairwell as a space for building a chimney of a building frame has been described, but this point is an exhaust gas used for air conditioning or the like. The same applies to smaller chimneys for smoke. In addition, in this embodiment, the spiral plate body 20 has a length in the spiral direction corresponding to the circumferential length of the donut-shaped plate body. It is also possible to easily make the directional length longer or shorter than the circumferential length of the donut-shaped plate body.

10 Exhaust guide vanes 20 Plate 21 Outer peripheral end surface of plate 100 Chimney 110 Cylinder wall 111 Inner peripheral surface of cylinder wall 120 Flue C Coil plate central axis C1 Flue central axis F Exhaust flow

Claims (2)

A chimney for raising the flue formed by the inner space of the cylindrical tube wall to discharge the exhaust flow sent from the exhaust gas generation source to the outside,
The flue is provided with exhaust guide vanes that impinge the exhaust flow rising up the flue to give a swirling action to the exhaust flow, and the exhaust guide vanes are made of a metal forming a spiral shape. The chimney, which is characterized in that the central axis of the spiral of the plate is arranged along the central axis of the flue.   The chimney according to claim 1, wherein an outer peripheral end surface of the plate member extending in a spiral shape is in contact with an inner peripheral surface of the cylindrical wall.

Images