Anti-vibration flue for fan inlet

Abstract

The utility model provides an anti-vibration flue for a fan inlet, which comprises a main flue and a plurality of branch flues, and the main flue comprises a first square round section, a first round elbow section, a first round straight section and a flue gas distributor from top to bottom; the first square-round section comprises a square inlet at the upper end and a round outlet at the lower end, the square inlet is connected with an outlet of the dust remover, and the round outlet is connected with an inlet of the first round elbow section; the first round elbow section is a bent round flue, the first round straight section is a vertical round flue, and an outlet of the first round elbow section is connected with an inlet of the first round straight section; the flue gas distributor comprises a circular inlet at the upper end and a sealing plate at the lower end, N circular distribution holes are formed in the sealing plate in the length direction, N-1 flow separation plates are arranged in the flue gas distributor to separate the N circular distribution holes, so that independent flues are defined by the flow separation plates and wall plates of the flue gas distributor, the N circular distribution holes are connected with N branch flues respectively, and the N branch flues are communicated with the N-1 flow separation plates. An outlet of the branch flue is connected with the fan, and N is larger than or equal to 2.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of flue gas treatment, especially a kind of anti-vibration flue for fan inlet. BACKGROUND

[0002] In the flue gas circulating fluidized bed (CFB) desulfurization system in the field such as coking or catalytic cracking, in order to ensure that the coking or catalytic cracking main machine is not affected by the desulfurization system fan, the desulfurization system fan usually adopts two fans as standby arrangement, that is, when one fan fails and needs to be repaired, the other fan can also meet the 100% load operation of the front-end main machine. Two fans run simultaneously in hot standby mode, each desulfurization fan extracts 50% of the main machine flue gas, and if the front-end main machine is reduced to 80% of full load, each desulfurization fan extracts 40% of the main machine flue gas, while the actual two desulfurization fans are selected according to 100% load flue gas.

[0003] The existing flue structure of two fan inlets basically adopts a square flue, and the main flue enters the square flue of each branch through a square air collecting box. Since the square flue is not resistant to vibration, if vibration prevention design is considered, more horizontal and vertical ribs need to be added, which not only consumes materials uneconomically but also has poor vibration prevention effect. At the same time, since the main flue gas needs to pass through two 90° bends in the square air collecting box before entering each square branch flue, the overall airflow is not smooth, the flue gas resistance is large, and vortex is easily generated. Reducing the load of the front-end main machine easily makes the two fans run in an unstable region, causing the desulfurization fan to surge, and further causing large vibration of the fan inlet flue. Flue vibration can cause certain harm and increase the frequency of front-end main machine shutdown and maintenance. UTILITY MODEL CONTENTS

[0004] The utility model solves the technical problem of providing an anti-vibration flue for fan inlet, which has a simple structure and can solve the problem of flue vibration at the fan inlet to a large extent, has small installation engineering quantity and less maintenance, can reduce flue gas resistance, improve flue gas flow field, effectively prolong flue life, and avoid increasing the frequency of front-end main machine shutdown and maintenance.

[0005] To solve the above technical problems, the utility model provides an anti-vibration flue for fan inlet, which comprises a main flue and a plurality of branch flues, the main flue comprises a first square-circular section, a first circular elbow section, a first circular straight section, and a flue gas distributor from top to bottom, the first square-circular section comprises a square inlet at the upper end and a circular outlet at the lower end, the square inlet is connected with the outlet of the dust collector, and the circular outlet is connected with the inlet of the first circular elbow section;

[0006] The first circular elbow section is a curved circular flue, the first circular straight section is a vertical circular flue, and the outlet of the first circular elbow section is connected with the inlet of the first circular straight section;

[0007] The smoke distributor comprises a circular inlet at the upper end and a sealing plate at the lower end, N circular distribution holes are formed on the sealing plate along the length direction, N-1 flow baffles are arranged in the smoke distributor to separate the N circular distribution holes, so that the flow baffles and the wall plates of the smoke distributor enclose independent flues, the N circular distribution holes are connected with N branch flues respectively, the outlets of the branch flues are connected with the fan, and N is greater than or equal to 2.

[0008] In some embodiments, the outlet of the first circular straight section is provided with the expansion joint.

[0009] In some embodiments, the flow baffles comprise four-sided inclined flow baffles, the left and right plate edges of the inclined flow baffles are connected with the wall plates of the smoke distributor, and the bottom plate edge is connected with the sealing plate.

[0010] In some embodiments, the bottom plate edge of the inclined flow baffles is located at the middle position of the adjacent circular distribution holes.

[0011] In some embodiments, the flow baffles comprise Y-shaped flow baffles, the two bottom plate edges of the Y-shaped flow baffles are connected with the sealing plate, and the left and right plate edges are connected with the wall plates of the smoke distributor.

[0012] In some embodiments, the distance between part or all of the circular distribution holes is the same as the distance between the two bottom plate edges, and the two sides of the Y-shaped flow baffles are tangent to the two sides of the circular distribution holes.

[0013] In some embodiments, the branch flue comprises a second circular straight section, a third circular straight section, a fourth circular straight section, a second circular elbow section and a third circular elbow section, the second circular elbow section is connected between the second circular straight section and the third circular straight section and between the third circular straight section and the fourth circular straight section respectively, the third circular elbow section is connected with the outlet of the fourth circular straight section, the plane where the third circular elbow section is bent is perpendicular to the plane where the fourth circular elbow section is bent, the second circular straight section, the third circular straight section and the fourth circular straight section are vertical circular flues, and the second circular elbow section and the third circular elbow section are curved circular flues.

[0014] In some embodiments, the branch flue comprises a fifth circular straight section, a sixth circular straight section, a second circular elbow section and a third circular elbow section, the second circular elbow section is installed between the fifth circular straight section and the sixth circular straight section and at the outlet of the sixth circular straight section respectively, the third circular elbow section is connected with the second circular elbow section, the plane where the second circular elbow section is bent is perpendicular to the plane where the third circular elbow section is bent, the fifth circular straight section and the sixth circular straight section are vertical circular flues, and the second circular elbow section and the third circular elbow section are curved circular flues.

[0015] In some embodiments, the bending angle of the second and third circular bending segments is controlled between 5-60°.

[0016] In some embodiments, the outlet of the third circular bending segment is connected to the circular inlet of the second square-circular segment, the square outlet of the second square-circular segment is connected to the square-straight segment, and the square-straight segment is connected to the fan.

[0017] In some embodiments, the square-straight segment is provided with a shut-off damper.

[0018] Compared with the prior art, the utility model has the beneficial effects that the utility model sets a square-circular segment at the outlet of the dust collector to change the square flue into a circular flue, so that most of the overall structure has the characteristics of the circular flue, and the anti-vibration effect is improved; meanwhile, the flue gas distributor is set to split the flue gas into multiple circular flue branches, the flue gas does not need to bend at a large angle, the overall airflow is smooth, the flue gas resistance is reduced, and the flue gas flow field is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the main view of the anti-vibration flue of the utility model;

[0020] Figure 2 It is the left view of the anti-vibration flue of the utility model;

[0021] Figure 3 It is the A-A sectional view of the anti-vibration flue of the utility model;

[0022] Figure 4 It is the schematic view of the flue gas distributor of the utility model.

[0023] 1, dust collector; 2, first square-circular segment; 3, first circular bending segment; 4, first circular-straight segment; 5, expansion joint; 6, flue gas distributor; 6-1, inclined baffle; 6-2, Y-shaped baffle; 6-3, sealing plate; 6-3-1, first circular distribution hole; 6-3-2, second circular distribution hole; 6-3-3, third circular distribution hole; 6-3-4, fourth circular distribution hole 6-3-4; 7, second circular-straight segment; 8, second circular bending segment; 9, third circular-straight segment; 10, fourth circular-straight segment; 11, third circular bending segment; 12, second square-circular segment; 13, square-straight segment; 14, shut-off damper; 15, fan; 16, fifth circular-straight segment; 17, sixth circular-straight segment 17. DETAILED DESCRIPTION

[0024] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, and all the other embodiments obtained by those skilled in the art without creative labor on the basis of the embodiments of the present application belong to the scope of protection of the present application.

[0025] In the description of the present application, it should be pointed out that the terms "upper", "lower", "inner", "outer", "top / bottom end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present application, it should be pointed out that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "sleeved / connected", "connected" and the like should be broadly understood, for example, "connected" can be wall-mounted connection, can be detachable connection, or integral connection, can be mechanical connection, can be electrical connection, can be directly connected, can be indirectly connected through an intermediate medium, can be the communication between two elements, and those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0027] With reference to Figures 1-4 , the embodiment provides an anti-vibration flue for the inlet of a fan 15, which comprises a main flue and a plurality of branch flues, wherein the main flue comprises a first square-circular segment 2, a first circular elbow segment, a first circular-straight segment 4 and a flue gas distributor 6 from top to bottom; the first square-circular segment 2 comprises a square-shaped inlet at the upper end and a circular-shaped outlet at the lower end, the square-shaped inlet is connected with the outlet of a dust collector 1, and the circular-shaped outlet is connected with the inlet of the first circular elbow segment;

[0028] The first circular elbow segment is a circular flue bent by 90 degrees, the first circular-straight segment 4 is a vertical circular flue, and the outlet of the first circular elbow segment is connected with the inlet of the first circular-straight segment 4; in order to compensate for the axial deformation caused by temperature change and mechanical vibration, thereby reducing the stress of the pipeline or container wall, and preventing damage caused by excessive stress, in the embodiment, the outlet of the first circular-straight segment 4 is provided with the expansion joint 5;

[0029] The smoke distributor 6 comprises a circular inlet at the upper end and a runway-shaped sealing plate 6-3 at the lower end, four circular distribution holes are arranged on the runway-shaped sealing plate 6-3 along the length direction, and the four circular distribution holes are respectively a first circular distribution hole 6-3-1, a second circular distribution hole 6-3-2, a third circular distribution hole 6-3-3 and a fourth circular distribution hole 6-3-4 from left to right.

[0030] Three flow baffles are arranged in the smoke distributor 6 to separate the four circular distribution holes, so that the flow baffles and the wall plates of the smoke distributor 6 form independent flues, and the four circular distribution holes are connected with four branch flues, and the outlets of the branch flues are connected with the fan 15.

[0031] The smoke distributor 6 is internally provided with two quadrilateral oblique flow baffles 6-1 arranged symmetrically left and right, the left and right plate edges of the oblique flow baffles 6-1 are welded with the wall plates of the smoke distributor 6, and the bottom plate edges are welded with the runway-shaped sealing plate 6-3. The bottom plate edge of one of the oblique flow baffles 6-1 is arranged at the middle position between the first circular distribution hole 6-3-1 and the second circular distribution hole 6-3-2, and the bottom plate edge of the other oblique flow baffle 6-1 is arranged at the middle position between the third circular distribution hole 6-3-3 and the fourth circular distribution hole 6-3-4.

[0032] A Y-shaped flow baffle 6-2 is arranged between the second circular distribution hole 6-3-2 and the third circular distribution hole 6-3-3, the distance between the second circular distribution hole 6-3-2 and the third circular distribution hole 6-3-3 is the same as the distance between the two bottom plate edges of the Y-shaped flow baffle 6-2, the two bottom plate edges of the Y-shaped flow baffle 6-2 are welded with the runway-shaped sealing plate 6-3, and the left and right plate edges are welded with the wall plates of the smoke distributor 6, after the connection is completed, the two sides of the Y-shaped flow baffle 6-2 are tangent to the second circular distribution hole 6-3-2 and the third circular distribution hole 6-3-3 respectively.

[0033] The smoke distributor 6 is divided into four parts by the oblique flow baffles 6-1 and the Y-shaped flow baffle 6-2, and four independent flues are formed in cooperation with the four circular distribution holes. The oblique flow baffles 6-1 and the Y-shaped flow baffle 6-2 can divide the circular inlet at the upper end of the smoke distributor 6 into four equal sections. As a simple alternative of the embodiment, the sections can also be divided into unequal sections according to the actual flow field.

[0034] The four circular distribution holes of the flue gas distributor 6 are connected with four branch flues respectively. The first circular distribution hole 6-3-1 and the fourth circular distribution hole 6-3-4 are connected with the branch flue composed of the second circular straight section 7, the second circular bending section 8, the third circular straight section 9, the second circular bending section 8, the fourth circular straight section 10 and the third circular bending section 11 from top to bottom.

[0035] The plane in which the second circular bending section 8 is bent is perpendicular to the plane in which the third circular bending section 11 is bent. The outlet of the third circular bending section 11 is connected with the circular inlet of the second square-circular section 12, the square outlet of the second square-circular section 12 is connected with the square-straight section 13, and the square-straight section 13 is connected with the fan 15.

[0036] The second circular distribution hole 6-3-2 and the third circular distribution hole 6-3-3 are connected with the branch flue composed of the fifth circular straight section 16, the second circular bending section 8, the sixth circular straight section 17, the second circular bending section 8 and the third circular bending section 11 from top to bottom. The second circular bending section 8 and the third circular bending section 11 are curved circular flues, and the fifth circular straight section 16 and the sixth circular straight section 17 are upright circular flues.

[0037] The plane in which the second circular bending section 8 is bent is perpendicular to the plane in which the third circular bending section 11 is bent. The outlet of the third circular bending section 11 is connected with the circular inlet of the second square-circular section 12, the square outlet of the second square-circular section 12 is connected with the square-straight section 13, and the square-straight section 13 is connected with the fan 15.

[0038] The bending angle of the second circular bending section 8 is 30°, but is not limited to 30° of the embodiment, and can be controlled between 5-60°. The bending angle of the third circular bending section 11 is 45°, but is not limited to 45° of the embodiment, and can be controlled between 5-60°.

[0039] The flue gas from the dust collector 1 passes through the first square-circular section 2, the first circular bending section 3, the first circular straight section 4, the expansion joint 5, enters the flue gas distributor 6, is evenly distributed to the first circular distribution hole 6-3-1, the second circular distribution hole 6-3-2, the third circular distribution hole 6-3-3 and the fourth circular distribution hole 6-3-4 by the oblique baffle 6-1 and the Y-shaped baffle 6-2, and finally flows into the fan 15 from the respective branch flues.

[0040] When the bending angle C of the second circular bending section 8 and the bending angle B of the third circular bending section 11 are changed, the positioning of the fan 15 can be changed.

[0041] The embodiment utilizes the characteristics of the circular flue rigidity, directly changes the diameter from the first square segment 2 to the circular flue at the outlet of the dust collector 1, and then vertically downwardly connects the first circular straight segment 4 through the 90° curved first circular bending segment 3. The first circular straight segment 4 is connected with the flue gas distributor 6 (detailed below Figure 4 ) at the lower end. The characteristics are that the upper end is circular and the lower end is runway type. Since the overall structure is mostly circular arc, the characteristics of the circular flue are possessed, and the anti-vibration effect is good. There is a runway type sealing plate 6-3 at the bottom of the flue gas distributor 6, and a plurality of circular distribution holes are arranged on the runway type sealing plate 6-3 to connect a plurality of circular branch flues. The flue gas distributor 6 is provided with two symmetrical inclined baffle plates 6-1 on the left and right sides and a Y-shaped baffle plate 6-2 in the middle. The main flue gas is uniformly distributed through the inclined baffle plates 6-1 and the Y-shaped baffle plate 6-2 in the flue gas distributor 6, and then enters the plurality of circular branch flues through the plurality of circular distribution holes on the sealing plate 6-3. Since the flue gas does not have a large angle bending from the first circular straight segment 4 to the flue gas distributor 6 and then to each circular branch flue, the overall airflow is smooth, and the flue gas resistance is greatly reduced. The plurality of circular branch flues are connected with the fan 15 through a plurality of circular straight segments, a plurality of circular bending segments, a square-circular segment and a square straight segment 13. When the load of the front end main machine is adjusted, although the fan 15 operates in the unstable area, the anti-vibration flue of the embodiment is not circular in a small square straight segment 13, and other components utilize the characteristics of the rigidity of the circular flue as much as possible to avoid the vibration of the flue.

[0042] In the embodiment, the wind baffle is arranged on the square straight segment 13 above the fan 15 to perform the online maintenance of the fan 15. When one of the fans 15 fails, the online maintenance of the fan 15 can be realized by closing the shutoff baffle 14 above the inlet of the fan 15.

[0043] The above is only the preferred specific implementation of the present application, but the design concept of the present application is not limited to this. Any skilled person in the technical field can make non-essential changes to the present application within the technical range disclosed by the present application, and such changes also belong to the behavior of infringing the protection range of the present application.

Claims

1. A vibration resistant flue for an inlet of a fan, characterized by, The main flue comprises a first square-circular section, a first circular elbow section, a first circular straight section and a flue gas distributor from top to bottom. The first circular elbow section is a curved circular flue, and the first circular straight section is a vertical circular flue. The flue gas distributor comprises a circular inlet at the upper end and a sealing plate at the lower end.

2. The anti-vibration flue for the inlet of a fan according to claim 1, characterized in that, The sealing plate is provided with N circular distribution holes along the length direction.

3. The anti-rattling flue for the inlet of a fan according to claim 1, wherein, N-1 flow baffles are arranged in the flue gas distributor to separate the N circular distribution holes.

4. The anti-vibration flue for the inlet of a fan according to claim 3, characterized in that, The flow baffles and the wall plates of the flue gas distributor form independent flues.

5. The anti-rattling flue for the inlet of a fan according to claim 1, wherein, The N circular distribution holes are connected with N branch flues respectively.

6. The anti-rattling flue for the inlet of a fan according to claim 5, wherein, The outlet of the first circular straight section is provided with an expansion joint.

7. The anti-rattling flue for the inlet of a fan according to claim 1, wherein, The flow baffles comprise quadrilateral inclined flow baffles.

8. The anti-rattling flue for the inlet of a fan according to claim 1, wherein, The left and right plate edges of the inclined flow baffles are connected with the wall plates of the flue gas distributor.

9. A vibration resistant flue for the inlet of a fan as claimed in claim 7 or 8, characterised in that, The bottom plate edge of the inclined flow baffles is connected with the sealing plate.

10. A vibration resistant flue for the inlet of a fan as claimed in claim 7 or 8, characterised in that, The bottom plate edge of the inclined flow baffles is located at the middle position of the adjacent circular distribution holes.

11. The anti-rattling flue for the inlet of a fan according to claim 10, wherein, The flow baffles comprise Y-shaped flow baffles. The two bottom plate edges of the Y-shaped flow baffles are connected with the sealing plate. The left and right plate edges of the Y-shaped flow baffles are connected with the wall plates of the flue gas distributor. The distance between some or all of the circular distribution holes is the same as the distance between the two bottom plate edges. The two sides of the Y-shaped flow baffles are tangent to the two circular distribution holes. The branch flue comprises a second circular straight section, a third circular straight section, a fourth circular straight section, a second circular elbow section and a third circular elbow section. The second circular elbow section is connected between the second circular straight section and the third circular straight section and between the third circular straight section and the fourth circular straight section respectively. The third circular elbow section is connected with the outlet of the fourth circular straight section. The plane in which the third circular elbow section is curved is perpendicular to the plane in which the fourth circular elbow section is curved. The second circular elbow section and the third circular elbow section are curved circular flues. The fifth circular straight section and the sixth circular straight section are vertical circular flues. The second circular elbow section and the third circular elbow section are curved circular flues. The bending angle of the second circular elbow section and the third circular elbow section is controlled to be between 5-60°. The outlet of the third circular elbow section is connected with the circular inlet of the second square-circular section. The square outlet of the second square-circular section is connected with a square-straight section. The square-straight section is provided with a shut-off baffle.

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