Multi-stage silencer of blast furnace gas pressure reducing valve group

Abstract

The utility model relates to the technical field of dust removal, in particular to a multistage silencer of a blast furnace gas pressure reducing valve bank, which comprises a gas inlet, a barrel and a gas outlet, at least two first silencing modules and at least two second silencing modules are mounted on the barrel, and the first silencing modules and the second silencing modules are arranged in a staggered manner; the first silencing module comprises fixing seats, sound absorption pieces and limiting seats, the fixing seats are welded to the top of the outer wall of the barrel at equal intervals, inserting holes are formed in the positions, corresponding to the fixing seats, of the barrel, the limiting seats are fixed to the bottom of the inner wall of the barrel at equal intervals, positioning holes are formed in the limiting seats, and the sound absorption pieces penetrate through the fixing seats and the inserting holes to be inserted into the positioning holes. The tops of the sound absorption pieces are detachably connected with the fixing base, and the sound absorption pieces of the first silencing module and the sound absorption pieces of the second silencing module are arranged in a staggered mode. The silencer has the advantages that the sound absorption piece can be detached from the silencer, fine holes in the surface of the sound absorption piece can be cleaned conveniently, and the maintenance cost is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of dust removal, and in particular to a multi-stage silencer for a blast furnace gas pressure reducing valve group. Background Technology

[0002] In the field of coal gas dust removal, pressure reducing valve groups are installed on the main gas pipe at the outlet of the coal gas dust collector. The gas flow noise in the pipeline after the pressure reducing valve group is relatively large. In order to reduce noise pollution, a silencer is usually installed after the pressure reducing valve group to reduce noise in the pipeline after the pressure reducing valve group.

[0003] In existing mufflers, the sound-absorbing plates inside the muffler are integrally welded to the muffler housing. If the fine pores on the surface of the sound-absorbing plates become clogged, affecting the sound absorption effect, the muffler needs to be repaired. Because the sound-absorbing plates and the muffler are integrally structured, the entire muffler needs to be replaced, resulting in high maintenance costs. Utility Model Content

[0004] This utility model provides a multi-stage silencer for a blast furnace gas pressure reducing valve group, which has the technical effect that the sound-absorbing plates can be removed from the silencer, making it easy to clean the fine pores on the surface of the sound-absorbing plates and reducing maintenance costs.

[0005] This utility model discloses a multi-stage silencer for a blast furnace gas pressure reducing valve assembly, which adopts the following technical solution:

[0006] A multi-stage silencer for a blast furnace gas pressure reducing valve assembly includes a gas inlet, a cylinder, and a gas outlet. The cylinder is fixed between the gas inlet and the gas outlet. At least two first silencer modules and second silencer modules are installed on the cylinder, and the first and second silencer modules are staggered. The structure of the second silencer module is the same as that of the first silencer module. The first silencer module includes a fixing seat, a sound-absorbing plate, and a limiting seat. Multiple fixing seats are welded at equal intervals to the top of the outer wall of the cylinder. Insertion holes are opened on the cylinder corresponding to the positions of the fixing seats. Multiple limiting seats are fixed at equal intervals to the bottom of the inner wall of the cylinder. Positioning holes are opened on the limiting seats. The sound-absorbing plate passes through the fixing seat and the insertion hole and is inserted into the positioning hole. The top of the sound-absorbing plate is detachably connected to the fixing seat. The sound-absorbing plates of the first and second silencer modules are staggered.

[0007] Furthermore, a flange is fixed to the top of the sound-absorbing sheet, and a flange is also fixed to the top of the mounting base. The two flanges are fixed by bolts. A groove is opened on the flange on the top of the mounting base, and a sealing ring is embedded in the groove.

[0008] Furthermore, the sound-absorbing sheet includes a micro-perforated plate, a glass fiber cloth, and glass fiber cotton. The glass fiber cloth wraps the glass fiber cotton, the micro-perforated plate covers the glass fiber cloth, and an air guide is fixed on the windward side of the micro-perforated plate.

[0009] Furthermore, a venting valve assembly is installed on the top of the cylinder near the gas outlet to release the gas inside the cylinder during silencer maintenance.

[0010] Furthermore, the venting valve assembly includes a lower pipe, a venting valve, and an upper pipe. The lower pipe is fixed to the cylinder, the venting valve is installed between the lower pipe and the upper pipe, and a fixing plate is fixed on the upper pipe. Multiple sets of guy ropes are connected to the fixing plate, and the end of the guy rope away from the fixing plate is fixed to the stress point of the surrounding building or equipment.

[0011] Furthermore, a flow-rectifying grid is fixed on the inner wall of the gas inlet to evenly distribute the airflow. The flow-rectifying grid is made of multiple horizontal plates and multiple vertical plates interwoven and welded together, and the airflow passes through the grid formed by the horizontal and vertical plates.

[0012] Furthermore, on each of the four faces of the grid away from the gas inlet, there are two or more welded flow channels.

[0013] Furthermore, maintenance manholes and drain holes are provided between the gas inlet and the first silencer module, between the first silencer module and the second silencer module, and between the second silencer module and the gas outlet.

[0014] Furthermore, the bottom of the cylinder is fixed with a movable support and a fixed support. A base plate is provided below the fixed support and the movable support. The fixed support is fixedly connected to the base plate, and the movable support is slidably connected to the base plate. The movable support can slide to both sides with the fixed support as a reference.

[0015] Compared with the prior art, the present invention has the following technical effects:

[0016] The silencer of this invention is easy to disassemble and assemble, easy to inspect and repair, has low maintenance costs, good noise reduction effect, and long service life, making it particularly suitable for noise reduction in gas pipelines. When the silencer is under maintenance, the vent valve assembly can release the gas inside the cylinder, ensuring the safety of personnel during maintenance. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of it, do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram illustrating the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram illustrating the rectifier grille in this utility model;

[0020] Figure 3 This is a schematic diagram illustrating the welding flow channel in this utility model;

[0021] Figure 4 To reflect Figure 1 Schematic diagram of section AA;

[0022] Figure 5 To reflect Figure 1 Schematic diagram of the BB section;

[0023] Figure 6 This is a schematic diagram illustrating the sound-absorbing sheet in this utility model.

[0024] Explanation of reference numerals in the attached drawings: 1. Gas inlet; 2. Cylinder; 21. Manhole; 22. Drain; 23. Movable support; 24. Fixed support; 3. Gas outlet; 4. Rectifying grille; 41. Welded flow channel; 5. First silencer module; 51. Fixed seat; 52. Sound-absorbing sheet; 521. Micro-perforated plate; 522. Air guide head; 53. Limiting seat; 6. Second silencer module; 7. Vent valve assembly; 71. Lower pipe; 72. Vent valve; 73. Upper pipe; 74. Fixed plate; 75. Guy rope. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. Here, the illustrative embodiments and descriptions of this utility model are used to explain the present utility model, but are not intended to limit the present utility model.

[0026] Reference Figures 1-6 A multi-stage silencer for a blast furnace gas pressure reducing valve assembly includes a gas inlet 1, a cylinder 2, and a gas outlet 3. The gas inlet 1 is fixed to one side of the cylinder 2, and the gas outlet 3 is fixed to the other side of the cylinder 2. The gas inlet 1, the cylinder 2, and the gas outlet 3 constitute the shell of the silencer.

[0027] A flow-rectifying grid 4 is welded and fixed inside the gas inlet 1. The flow-rectifying grid 4 is composed of multiple horizontal and vertical plates welded together in a cross-sectional and interwoven manner. The flow-rectifying grid 4 enables the airflow to be distributed more evenly within the pipe's flow cross-section. The horizontal and vertical plates form multiple grids, and each grid has welded flow channels 41 on four sides on the side away from the gas inlet 1. The welded flow channels 41 are welded to the four sides of the grid with hard alloy welding rods, and at least two welded flow channels 41 are welded to each grid surface. The welded flow channels 41 form hard alloy flow channels, which changes the airflow trajectory, reduces the forward scouring of the flow-rectifying grid 4 by the airflow, and extends the service life of the flow-rectifying grid 4.

[0028] The cylinder 2 is provided with a first silencing module 5 and a second silencing module 6. There are two of each of the first silencing module 5 and the second silencing module 6. The first silencing module 5 and the second silencing module 6 are arranged in an alternating series connection. The second silencing module 6 has the same structure as the first silencing module 5.

[0029] The first silencing module 5 includes multiple sets of fixing seats 51, sound-absorbing sheets 52, and limiting seats 53. The fixing seats 51 are welded at equal intervals to the top of the outer wall of the cylinder 2. Insertion holes are provided on the cylinder 2 corresponding to the positions of the fixing seats 51. The sound-absorbing sheets 52 pass through the fixing seats 51 and the insertion holes to be inserted into the cylinder 2. A flange is fixed to the top of the sound-absorbing sheet 52, and a flange is also fixed to the top of the fixing seat 51. The flange on the top of the sound-absorbing sheet 52 and the flange on the top of the fixing seat 51 are fixed together by bolts. A groove is provided on the flange on the top of the fixing seat 51, and a sealing ring is embedded in the groove to increase the sealing between the flange of the sound-absorbing sheet 52 and the flange of the fixing seat 51.

[0030] The limiting seat 53 is fixed to the bottom of the inner wall of the cylinder 2. The limiting seat 53 has a positioning hole. The bottom of the sound-absorbing sheet 52 is inserted into the limiting hole, thereby ensuring the accurate positioning of the sound-absorbing sheet 52 during installation and facilitating the alignment of the flange on the sound-absorbing sheet 52 with the flange bolt hole on the fixing seat 51.

[0031] The sound-absorbing sheet 52 includes a microporous plate 521, fiberglass cloth, and fiberglass wool. The fiberglass cloth wraps the fiberglass wool, and the microporous plate 521 covers the fiberglass cloth inside. A guide head 522 is fixed to the windward side of the microporous plate 521. Airflow passes through the guide head 522 and enters the silencing channel formed by the individual sound-absorbing sheets 52. Then, through the small holes in the microporous plate 521, noise is absorbed by the fiberglass wool, achieving noise reduction and silencing. The sound-absorbing sheets 52 of the first silencing module 5 and the second silencing module 6 are staggered to better ensure the silencing effect.

[0032] A vent valve assembly 7 is installed on the top side of the cylinder 2 near the gas outlet 3. The vent valve assembly 7 is used to release gas inside the cylinder 2 during silencer maintenance, ensuring the safety of maintenance personnel. The vent valve assembly 7 includes a lower pipe 71, a vent valve 72, an upper pipe 73, guy ropes 75, and a fixing plate 74. The lower pipe 71 is fixed to the cylinder 2, and the vent valve 72 is installed between the lower pipe 71 and the upper pipe 73. Three sets of guy ropes 75 are evenly distributed along the circumference of the upper pipe 73. The fixing plate 74 is fixed to the upper pipe 73. One end of the guy rope 75 is connected to the fixing plate 74, and the other end is fixed to a nearby building or equipment stress point. The guy ropes 75 are used to secure the upper pipe 73 when the pipe is too high, ensuring the stability of the vent valve assembly 7. The vent valve 72 can be a manual valve, a pneumatic valve, or an electric valve.

[0033] Inspection manholes 21 and drain holes 22 are provided between the gas inlet 1 and the first silencer module 5, between the first silencer module 5 and the second silencer module 6, and between the second silencer module 6 and the gas outlet 3, to facilitate maintenance by staff.

[0034] The bottom of the cylinder 2 is fixed with three movable supports 23 and one fixed support 24. A base plate is provided below the fixed support 24 and the movable supports 23. The fixed support 24 is fixedly connected to the base plate, and the movable support 23 is slidably connected to the base plate. The movable support 23 can slide to both sides with the fixed support 24 as a reference. The fixed support 24 and the movable support 23 work together to provide support and also to accommodate the displacement caused by the thermal expansion of the cylinder 2.

[0035] The implementation principle of this multi-stage silencer for blast furnace gas pressure reducing valve assembly is as follows: Gas enters the silencer from the gas inlet 1, passes through the rectifier grille 4 and hard alloy flow channel, and the airflow enters the cylinder 2 evenly. The airflow passes sequentially through the first silencer module 5, the second silencer module 6, and the second silencer module 6. Noise is absorbed by the glass fiber cotton inside the first silencer module 5 and the second silencer module 6, achieving noise reduction. When the silencer is under maintenance, the vent valve assembly 7 can release the gas inside the cylinder 2, ensuring the safety of the personnel during maintenance.

[0036] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model are included within the scope of protection of this utility model.

Claims

1. A multi-stage silencer for a blast furnace gas pressure reducing valve assembly, comprising a gas inlet (1), a cylinder (2), and a gas outlet (3), wherein the cylinder (2) is fixed between the gas inlet (1) and the gas outlet (3), characterized in that, At least two first silencing modules (5) and second silencing modules (6) are installed on the cylinder (2). The first silencing modules (5) and second silencing modules (6) are staggered. The structure of the second silencing module (6) is the same as that of the first silencing module (5). The first silencing module (5) includes a fixed seat (51), a sound-absorbing plate (52) and a limiting seat (53). Multiple fixed seats (51) are welded at equal intervals to the top of the outer wall of the cylinder (2). Insertion holes are opened on the cylinder (2) at the positions corresponding to the fixed seats (51). Multiple limiting seats (53) are fixed at equal intervals to the bottom of the inner wall of the cylinder (2). Positioning holes are opened on the limiting seats (53). The sound-absorbing plate (52) passes through the fixed seat (51) and the insertion hole and is inserted into the positioning hole. The top of the sound-absorbing plate (52) is detachably connected to the fixed seat (51). The sound-absorbing plates (52) of the first silencing module (5) and the second silencing module (6) are staggered.

2. The multi-stage silencer for blast furnace gas pressure reducing valve assembly according to claim 1, characterized in that, The top of the sound-absorbing sheet (52) is fixed with a flange, and the top of the mounting base (51) is also fixed with a flange. The two flanges are fixed by bolts. A groove is provided on the flange on the top of the mounting base (51), and a sealing ring is embedded in the groove.

3. The multi-stage silencer for blast furnace gas pressure reducing valve assembly according to claim 1 or 2, characterized in that, The sound-absorbing sheet (52) includes a micro-perforated plate (521), a glass fiber cloth and glass fiber cotton. The glass fiber cloth wraps the glass fiber cotton, the micro-perforated plate (521) covers the glass fiber cloth, and a wind guide head (522) is fixed on the windward side of the micro-perforated plate (521).

4. The multi-stage silencer for blast furnace gas pressure reducing valve assembly according to claim 1, characterized in that, A venting valve group (7) is installed on the top of the cylinder (2) near the gas outlet (3) to release the gas inside the cylinder (2) during maintenance.

5. The multi-stage silencer for blast furnace gas pressure reducing valve assembly according to claim 4, characterized in that, The vent valve assembly (7) includes a lower pipe (71), a vent valve (72) and an upper pipe (73). The lower pipe (71) is fixed on the cylinder (2). The vent valve (72) is installed between the lower pipe (71) and the upper pipe (73). A fixing plate (74) is fixed on the upper pipe (73). Multiple sets of guy ropes (75) are connected to the fixing plate (74). The end of the guy rope (75) away from the fixing plate (74) is fixed to the stress point of the surrounding building or equipment.

6. The multi-stage silencer for blast furnace gas pressure reducing valve assembly according to claim 1, characterized in that, A flow-rectifying grid (4) is fixed on the inner wall of the gas inlet (1) to uniformly distribute the airflow. The flow-rectifying grid (4) is made of multiple horizontal plates and multiple vertical plates interwoven and welded together. The airflow passes through the grid formed by the horizontal plates and vertical plates.

7. The multi-stage silencer for blast furnace gas pressure reducing valve assembly according to claim 6, characterized in that, Two or more welding channels (41) are fixed on each of the four faces of the grid away from the gas inlet (1).

8. The multi-stage silencer for blast furnace gas pressure reducing valve assembly according to claim 1, characterized in that, A maintenance manhole (21) and a drain hole (22) are provided between the gas inlet (1) and the first silencer module (5), between the first silencer module (5) and the second silencer module (6), and between the second silencer module (6) and the gas outlet (3).

9. The multi-stage silencer for blast furnace gas pressure reducing valve assembly according to claim 1, characterized in that, The bottom of the cylinder (2) is fixed with a movable support (23) and a fixed support (24). A base plate is provided below the fixed support (24) and the movable support (23). The fixed support (24) is fixedly connected to the base plate, and the movable support (23) is slidably connected to the base plate. The movable support (23) can slide to both sides with the fixed support (24) as the reference.

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