Anti-vibration flue for limited space

Abstract

The utility model provides an anti-vibration flue for limited space, which comprises a runway type smoke pipe and a reducer pipe, two ends of the runway type smoke pipe are connected with the reducer pipe to be used for communicating the runway type smoke pipe with an upstream round straight flue and a downstream round straight flue, the radius of a bent part of the runway type smoke pipe is R1, and the length of a straight part of the runway type smoke pipe is L; a large-end pipe opening of the reducer pipe is connected with the round straight flue, and a small-end pipe opening of the reducer pipe is connected with the runway type smoke pipe.

Description

Technical Field

[0001] The utility model relates to the field of flue structures, in particular to a vibration-resistant flue used in a confined space. Background Art

[0002] In the flue gas circulating fluidized bed (CFB) desulfurization system, especially the newly built steel sintering industry needs to be equipped with a flue gas circulating fluidized bed (CFB) desulfurization system, the sintering main exhaust fan usually uses a variable frequency fan. Because the unstable area in the performance curve of the variable frequency fan is larger than the unstable area of ​​the industrial frequency fan, when the sintering machine runs under low working conditions, it is easy to enter the unstable area of ​​the fan and cause the main exhaust fan to surge, which in turn causes the main exhaust fan outlet flue to vibrate violently.

[0003] In order to avoid violent vibration of the flue, the main exhaust fan outlet flue is usually designed with a circular flue. However, due to the small space of the renovation project, the flue cannot be arranged as a circular flue, and only a rectangular flue can be used. Since the rectangular flue is not resistant to vibration, when the main exhaust fan surges, fatigue cracks will appear in the rectangular flue, and the frequency of main engine shutdown and maintenance needs to be increased, affecting the output of the sintering machine. When the rectangular flue is designed for vibration prevention, the economic cost will increase. In addition, the overall flue gas flow field of the rectangular flue is relatively uneven, and the resistance is relatively large due to the large number of internal supports. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a vibration-resistant flue for confined spaces, which can solve the problem of reduced flue life caused by the use of traditional rectangular flues in confined spaces due to their lack of vibration resistance, reduce the frequency of host machine shutdowns and maintenance, and has a simple structure and a small installation workload.

[0005] In order to solve the above problems, the utility model provides an anti-vibration flue for confined space, comprising a runway-shaped flue pipe and a reducer, wherein the two ends of the runway-shaped flue pipe are connected to the reducer for connecting the runway-shaped flue pipe with the upstream and downstream circular straight flues, and the radius of the curved part of the runway-shaped flue pipe is R 1 , the length of the straight part is L; the large end of the reducer is connected to the circular straight flue, and the small end is connected to the runway-shaped smoke pipe.

[0006] In some embodiments, the racetrack-shaped smoke pipe includes two symmetrically arranged pieces with a radius R 1 The curved portion is formed by a semicircular tube, and also includes two rectangular side plates with a width of L. The two rectangular side plates are connected between the two semicircular tubes to form a straight portion of the runway-shaped smoke tube.

[0007] In some embodiments, the reducer comprises two symmetrically arranged curved plates, the endpoints of one end of the two curved plates abut against each other to form the large end pipe opening, and the endpoints of the other ends of the two curved plates are spaced a distance L apart;

[0008] The reducer also includes two triangular side plates, the bottom sides of which are connected between two end points at a distance L at the other ends of the two curved plates to form the small end pipe opening.

[0009] In some embodiments, the length of L is less than or equal to 3 times the length of R 1 .

[0010] In some of the embodiments, the racetrack-shaped smoke pipe is provided with at least one annular main reinforcement, the annular main reinforcement surrounds the outer surface of the racetrack-shaped smoke pipe, and the reinforcement spacing between two adjacent annular main reinforcements is 1.5m-4m.

[0011] In some embodiments, an inner support is provided inside the runway-shaped smoke pipe, and the inner support is provided between the rectangular side panels on both sides, and two ends of the inner support are aligned with the annular main ribs on the outer surface of the rectangular side panels.

[0012] In some of the embodiments, the reducer is provided with at least one annular main reinforcement, the annular main reinforcement surrounds the outer surface of the reducer, and the reinforcement spacing between two adjacent annular main reinforcements is 1.5m-4m.

[0013] In some embodiments, an inner support is provided inside the reducer, and the inner support is provided between the triangular side plates on both sides, and two ends of the inner support are aligned with the annular main ribs on the outer surface of the triangular side plates.

[0014] In some of the embodiments, a plurality of secondary ribs perpendicular to the annular main ribs are respectively arranged on the outer surface of the rectangular side plate, the secondary ribs are arranged between two adjacent annular main ribs, and both ends of the secondary ribs are connected to the annular main ribs.

[0015] In some embodiments, the spacing between two adjacent secondary reinforcement bars is 0.4m-1m.

[0016] In some of the embodiments, a plurality of secondary ribs perpendicular to the annular main ribs are disposed on the outer surface of the triangular side plate, the secondary ribs are disposed between two adjacent annular main ribs, and both ends of the secondary ribs are connected to the annular main ribs.

[0017] In some embodiments, the spacing between two adjacent secondary reinforcement bars is 0.4m-1m.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. The vibration-resistant flue provided by the utility model is designed with a flue structure in which a runway-type smoke pipe is connected to the upstream and downstream circular flues through a reducer, so that the flue can be used in a confined space and has a vibration-resistant effect, avoiding the problem of flue fatigue cracks caused by induced draft fan surge and increasing the service life of the flue.

[0020] 2. The arrangement spacing of the anti-vibration flue annular main reinforcement provided by the utility model is 1.5-4 meters, while the arrangement spacing of the rectangular flue main reinforcement is usually controlled below 0.97 meters. Therefore, the number of internal supports corresponding to the anti-vibration flue annular main reinforcement is also small, and the overall structure is simple, so the installation workload is small, and it can reduce smoke resistance and improve smoke flow field. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view of the vibration-resistant flue of the utility model;

[0022] Figure 2 It is a side view of the vibration-resistant flue of the utility model;

[0023] Figure 3 It is a top view of the vibration-resistant flue of the utility model;

[0024] Figure 4 It is a schematic diagram of reinforcement arrangement of the vibration-resistant flue of the utility model;

[0025] Figure 5 for Figure 4 The cross-sectional view of the AA section;

[0026] Figure 6 for Figure 4 Cross-sectional view of the BB section.

[0027] Figure numerals: 1. upstream circular straight flue; 2. reducer; 3. runway-type flue; 4. downstream circular straight flue; 2-1. curved panel; 2-2. triangular side panel; 3-1. semicircular tube; 3-2. rectangular side panel; 2-3. annular main reinforcement one; 3-3. annular main reinforcement two; 2-4. secondary reinforcement one; 3-4. secondary reinforcement two; 2-5. inner support one; 3-5. inner support two. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0029] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "installed / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0031] Reference Figure 1-6 The present embodiment provides a vibration-resistant flue for a confined space, comprising a runway-shaped smoke pipe 3 and a reducer 2. Along the direction of smoke flow, the inlet of the runway-shaped smoke pipe 3 is connected to the upstream outlet of an upstream circular straight smoke pipe 1 in a spacious area, which is led out from the outlet of a main exhaust fan, through the reducer 2. The outlet of the runway-shaped smoke pipe 3 is connected to the downstream inlet of a downstream straight smoke pipe 4 in a spacious area through the reducer 2.

[0032] Specifically, the racetrack-shaped smoke pipe 3 includes two symmetrically arranged upper and lower parts with a radius of R 1 The semicircular tube 3-1, the two semicircular tubes 3-1 form a runway-shaped smoke tube 3 with a radius of R 1 The curved portion also includes two rectangular side panels 3-2 with a width of L, and the two rectangular side panels 3-2 are connected between the two semicircular tubes 3-1 to form a straight portion of the runway-shaped smoke tube 3;

[0033] The reducer 2 is composed of two symmetrically arranged curved panels 2-1 and two triangular side panels 2-2 on the side. The endpoints of one end of the two curved panels 2-1 are mutually abutted to form a large end port of the reducer 2. At this time, the distance between the two endpoints of the other end of the two curved panels 2-1 is L. The bottom edge of the triangular side panel 2-2 is connected between the two endpoints of the other end of the curved panel 2-1 with a distance of L to form a small end pipe opening. The cross section of the small end pipe opening of the assembled reducer 2 presents a runway shape that is the same as the runway shape of the smoke pipe 3, including a radius of R. 1The curved part of the triangular side plate 2-2 forms a straight part with a length of L at the bottom edge, so that it can be completely connected with the runway-type smoke pipe 2.

[0034] The large end opening of the reducer 2 is a circle with the same radius as the upstream circular straight flue 1 and the downstream circular straight flue 4, and the small end opening of the reducer 2 is a runway-shaped shape with the same shape as the runway-type smoke pipe 3. The outlet of the upstream circular straight flue 1 along the flow direction of the smoke is connected to the large end opening of the reducer 2, and the small end opening of the reducer 2 is connected to the inlet of the runway-type smoke pipe 3, so that the flue is reduced from a circular straight flue in a spacious area to a runway-type smoke pipe 3 in a confined space. The outlet of the runway-type smoke pipe 3 is connected to the small end opening of another reducer 2, and then the large end opening of the reducer 2 is connected to the downstream circular straight flue 4, and the runway-type smoke pipe 3 that passes through the confined space is reduced back to the circular straight flue in a spacious area.

[0035] The sizes of the large end port and the small end port of the reducer 2 are determined according to the sizes of the upstream circular straight flue 1, R1 and L of the racetrack-shaped flue 3, and the downstream circular straight flue 4 in actual working conditions.

[0036] like Figure 3 As shown, the flue gas from the main exhaust fan outlet flue passes through the upstream circular straight flue 1, the reducer 2, the runway-type flue 3, and the downstream circular straight flue 4 in sequence. The runway-type flue 2 occupies a smaller area than the ordinary circular flue, so it can be used in confined spaces to avoid buildings. In addition, because the structures of the runway-type flue 2 and the reducer 2 have curved semicircular tubes compared to the rectangular flue used in the traditional confined space, they have the anti-vibration function of the circular flue. In order to further enhance the anti-vibration effect of the runway-type flue 2, in this embodiment, the length of L is less than or equal to 2 times R1. At this time, most of the area of ​​the runway-type flue 3 is a semicircular tube, and a small part of the area is a rectangular side panel, which has a better anti-vibration effect.

[0037] In order to reinforce the runway-shaped smoke pipe 3 and reducer 2 formed by splicing, and enhance the vibration resistance of the smoke duct, in this embodiment, a plurality of annular main reinforcements 2-3 are welded on the outer surface of the runway-shaped smoke pipe 3. The annular main reinforcements 2-3 can be arranged in 1 circle, 2 circles, or 3 circles according to the length and size of the runway-shaped smoke pipe 3. The number of circles depends on the specific working conditions. The annular main reinforcements 2-3 surround the outer surface of the runway-shaped smoke pipe 3, and the spacing between two adjacent annular main reinforcements 2-3 is controlled between 1.5 and 4 meters. Similarly, at least one annular main reinforcement 1-2-3 is welded on the outer surface of the reducer 2, and the annular main reinforcement 1-2-3 is welded around the outer surface of the reducer 2, and the spacing between adjacent annular main reinforcements 1-2-3 is also controlled between 1.5 and 4 meters.

[0038] Among them, the annular main reinforcement 2-3 or the annular main reinforcement 3-3 is a conventional steel or a welded steel, which can be a channel steel, T-shaped steel, flat steel, I-shaped steel, H-shaped steel, etc., and is not limited to a specific steel, as long as the purpose of this embodiment can be achieved.

[0039] In order to further strengthen the firmness of the rectangular side panels 3-2 on both sides of the runway-shaped smoke tube 3, in the present embodiment, a plurality of secondary ribs 3-4 perpendicular to the annular main ribs 3-3 are arranged on the outer surfaces of the rectangular side panels 3-2 on both sides of the runway-shaped smoke tube 2, and the two ends of the secondary ribs 3-4 are respectively welded to two adjacent annular main ribs 3-3 so that the secondary ribs 3-4 are arranged between two adjacent annular main ribs 3-3, and a plurality of secondary ribs 3-4 are welded between every two adjacent annular main ribs 3-3, and the plurality of secondary ribs 3-4 are parallel to each other, and the spacing between two adjacent parallel secondary ribs 3-4 is controlled to be between 0.4m and 1m.

[0040] Similarly, in order to enhance the firmness of the triangular side plates 2-2 on both sides of the reducer 2, a plurality of secondary ribs 2-4 perpendicular to the annular main ribs 2-3 on the outer surface of the reducer 2 are arranged on the outer surfaces of the triangular side plates 2-2 on both sides of the reducer 2, and the two ends of the secondary ribs 2-4 are respectively welded to the annular secondary ribs so that the secondary ribs 2-4 are arranged between the two annular secondary ribs. When the reducer 2 has only one circle of annular secondary reinforcement 2-3, the two ends of the secondary reinforcement 2-4 are respectively welded to the annular main reinforcement 2-3 on the outer surface of the reducer 2 and the annular main reinforcement 3-3 on the outer surface of the adjacent runway-type smoke pipe 2; when the outer surface of the reducer 2 is surrounded by two or more circles of annular main reinforcement 2-3, the two ends of the secondary reinforcement 2-4 are respectively welded to two adjacent annular main reinforcements 2-3 on the outer surface of the reducer 2, and multiple secondary reinforcements 2-4 are welded between every two adjacent annular main reinforcements 2-3, and the multiple secondary reinforcements 2-4 are parallel to each other, and the reinforcement spacing between two adjacent parallel secondary reinforcements 2-4 is also controlled between 0.4m-1m.

[0041] In the working condition of flue design, for the purpose of construction safety and reducing the use of reinforcing ribs such as the specifications of external annular main reinforcements, it is generally necessary to set an internal support inside the flue. In this embodiment, an internal support 2 3-5 is set inside the runway-type smoke pipe 3. The internal support 2 3-5 is set between the rectangular side panels 3-2 on both sides, and the two ends of the internal support 2 3-5 are aligned with the annular main reinforcement 2 3-3 on the outer surface of the rectangular side panel 3-2 and then welded inside the runway-type smoke pipe 3. The internal support 2 3-5 is preferably welded in the middle position of the rectangular side panel 3-2 so that the internal support 2 3-5 is located in the middle of the entire runway-type smoke pipe 3. At the same time, each position inside the runway-type smoke pipe 3 that is aligned with the annular main reinforcement 2 3-3 is welded with an internal support 2 3-5, so the number of the internal supports 2 3-5 is consistent with the number of the annular main reinforcement 2 3-3 on the outer surface of the runway-type smoke pipe 3, and the spacing between adjacent internal supports 2 3-5 is also consistent with the annular main reinforcement 2 3-3 on the outer surface.

[0042] The reducer 2 is also provided with an inner support 2-5, which is provided between the triangular side plates 2-2 on both sides of the reducer 2, and the two ends of the inner support 2-5 are aligned with the annular main ribs 2-3 on the outer surface of the triangular side plates 2-2 and then welded inside the reducer 2. The inner support 2-5 is preferably welded at the middle position of the triangular side plates 2-2 along the bottom direction so that the inner support 2-5 is located in the middle of the entire reducer 2. At the same time, each position inside the reducer 2 that is aligned with the annular main ribs 2-3 is welded with an inner support 2-5, so the number of the inner supports 2-5 inside the reducer 2 is consistent with the number of the annular main ribs 2-3 provided on the outer surface of the reducer 2, and the spacing between adjacent inner supports 2-5 is also consistent with the spacing of the annular main ribs 2-3 on the outer surface.

[0043] The upstream round straight flue 1 leading from the outlet of the main exhaust fan in the spacious area is reduced in diameter through the reducer 2 and connected with the runway-type flue 3 in the space limited by the building. After the runway-type flue 3 passes through the limited space, it is connected with the downstream round straight flue 4 through the reducer 2 to realize the vibration-resistant standard design of the limited space. Since the curved plate 2-1 of the reducer 2 and the 3-1 of the runway-type flue are arc structures and occupy most of the entire pipeline, the overall vibration-resistant performance is close to that of the circular flue and better than that of the rectangular flue, so the service life of the flue can be extended and the frequency of shutdown and maintenance can be reduced.

[0044] At the same time, the arrangement spacing of the anti-vibration flue annular main reinforcements of the present embodiment is 1.5-4 meters, while the arrangement spacing of the rectangular flue main reinforcements is usually controlled below 0.97 meters. Therefore, the number of internal supports corresponding to the annular main reinforcements of the anti-vibration flue is also small, and therefore the smoke resistance flowing through the flue is also small. In addition, since the runway-type smoke pipe 3 and the reducer 2 have the characteristics of a circular flue, when the smoke flows through the reducer 2 and the runway-type smoke pipe 3, the overall smoke resistance is also smaller than that of the rectangular flue, thereby effectively improving the smoke flow field in the flue.

[0045] The above is only a preferred specific implementation method of the utility model, but the design concept of the utility model is not limited to this. Any technician familiar with the technical field who uses this concept to make non-substantial changes to the utility model within the technical scope disclosed by the utility model shall be deemed to infringe the protection scope of the utility model.

Claims

1. A vibration-resistant flue for confined space, characterized in that: It comprises a runway-shaped smoke pipe and a reducer. The reducers are connected at both ends of the runway-shaped smoke pipe to connect the runway-shaped smoke pipe with upstream and downstream circular straight smoke ducts. The radius of the curved part of the runway-shaped smoke pipe is R1, and the length of the straight part is L. The large end of the reducer is connected to the circular straight smoke duct, and the small end is connected to the runway-shaped smoke pipe.

2. The vibration-resistant flue for confined space according to claim 1, characterized in that: The racetrack-shaped smoke pipe includes two symmetrically arranged semicircular tubes with a radius of R1 to form the curved portion, and also includes two rectangular side panels with a width of L. The two rectangular side panels are connected between the two semicircular tubes to form the straight portion of the racetrack-shaped smoke pipe.

3. The vibration-resistant flue for confined space according to claim 1, characterized in that: The reducer comprises two symmetrically arranged curved plates, the endpoints of one end of the two curved plates abut against each other to form the large end pipe opening, and the endpoints of the other ends of the two curved plates are spaced a distance L apart; The reducer also includes two triangular side plates, the bottom sides of which are connected between two end points at a distance L at the other ends of the two curved plates to form the small end pipe opening.

4. The vibration-resistant flue for confined space according to claim 1, characterized in that: The length of L is less than or equal to 3 times of R1.

5. The vibration-resistant flue for confined space according to claim 2, characterized in that: The racetrack-shaped smoke pipe is provided with at least one annular main reinforcement, which surrounds the outer surface of the racetrack-shaped smoke pipe, and the spacing between two adjacent annular main reinforcements is 1.5m-4m.

6. The vibration-resistant flue for confined space according to claim 5, characterized in that: An inner support is arranged inside the racetrack-shaped smoke pipe, and the inner support is arranged between the rectangular side panels on both sides, and two ends of the inner support are aligned with the annular main ribs on the outer surface of the rectangular side panels.

7. The vibration-resistant flue for confined space according to claim 3, characterized in that: The reducer is provided with at least one annular main reinforcement, which surrounds the outer surface of the reducer, and the spacing between two adjacent annular main reinforcements is 1.5m-4m.

8. The vibration-resistant flue for confined space according to claim 7, characterized in that: An inner support is arranged inside the reducer, and the inner support is arranged between the triangular side plates on both sides, and two ends of the inner support are aligned with the annular main ribs on the outer surface of the triangular side plates.

9. The vibration-resistant flue for confined space according to claim 5, characterized in that: A plurality of secondary ribs perpendicular to the annular main ribs are respectively arranged on the outer surfaces of the rectangular side plates. The secondary ribs are arranged between two adjacent annular main ribs, and two ends of the secondary ribs are connected to the annular main ribs.

10. The vibration-resistant flue for confined space according to claim 9, characterized in that: The spacing between two adjacent secondary reinforcement bars is 0.4m-1m.

11. The vibration-resistant flue for confined space according to claim 7, characterized in that: A plurality of secondary ribs perpendicular to the annular main ribs are arranged on the outer surface of the triangular side plate. The secondary ribs are arranged between two adjacent annular main ribs, and both ends of the secondary ribs are connected to the annular main ribs.

12. The vibration-resistant flue for confined space according to claim 11, characterized in that: The spacing between two adjacent secondary reinforcement bars is 0.4m-1m.

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