Dry-type flame arrester for coal mine gas conveying pipeline

Abstract

The utility model discloses a dry-type flame arrester for a coal mine gas conveying pipeline, which relates to the technical field of flame arresting of the coal mine gas conveying pipeline and comprises a shell component, a flame arresting part and a fastener. Through the combined design of the fire-retardant sleeve, the stainless steel wire mesh and the corrugated plate type fire-retardant disc, flame propagation can be effectively blocked, and gas explosion accidents are prevented; the flame arrester adopts the design of the shell assembly and the flame arresting part which are in mirror symmetry, is convenient to install and maintain, and ensures the stability of the structure through the connection of a fastener; the flame arrester is suitable for gas conveying pipelines with different pipe diameters, can meet the use requirements under different pressure conditions, and is wide in application range; when the gas passes through the flame arrester at the average flow speed of 15m / s, the pressure drop is less than or equal to 1kPa, so that the gas conveying efficiency is not influenced; in conclusion, the dry type flame arrester provided by the utility model can effectively solve the explosion problem in a coal mine gas conveying pipeline, insulates flame propagation, ensures the production safety of a coal mine, and has a wide application prospect.

Description

TECHNICAL FIELD

[0001] The utility model relates to coal mine gas conveying pipeline fire resistance technical field, concretely is a kind of dry fire arrester for coal mine gas conveying pipeline. BACKGROUND

[0002] Coal, petroleum, chemical industry, textile and other industries occupy important position in national economy, these industries in production process can produce explosive gas, steam or dust, especially coal industry, gas and coal powder are the main factors causing explosion accident. Therefore, the fire resistance problem of coal mine gas conveying pipeline is particularly important, effective fire resistance measures must be taken to guarantee safety.

[0003] Coal mine gas conveying pipeline is an important component in coal mine safety production, its main function is to safely convey the gas generated in mine to ground or designated processing facility. However, gas has the characteristics of flammable and explosive, once encountering open fire, static electricity spark or other ignition source in conveying process, it is easy to cause explosion accident, cause serious personnel casualty and property loss. Therefore, the safety protection measure of coal mine gas conveying pipeline is particularly important, and fire arrester as a kind of key safety equipment can effectively prevent flame propagation, guarantee the safe operation of pipeline system.

[0004] Traditional fire arrester is mainly divided into two categories of wet type fire arrester and dry type fire arrester. Wet type fire arrester cools and extinguishes flame through liquid medium (such as water), but its structure is complex, maintenance cost is high, and it is not suitable for low temperature environment. In comparison, dry type fire arrester gradually becomes the mainstream choice in coal mine gas conveying pipeline due to its simple structure, convenient maintenance and wide application range.

[0005] Existing dry type fire arrester is usually composed of shell assembly and fire arrester, and fire arrester is internally provided with fire arrester disc, stainless steel wire mesh and other fire arrester elements, and flame propagation is prevented through physical barrier and cooling effect. However, existing dry type fire arrester still has some problems in actual application: first, the structure design of fire arrester is not compact enough, resulting in large volume, and installation and maintenance are inconvenient;Second, the fire resistance effect of fire arrester is limited by the material and structure of fire arrester element, and it is difficult to meet the gas conveying requirement of high flow rate and high pressure;In addition, the fire resistance performance of existing fire arrester is prone to decline after multiple fire resistance tests, and there is safety hazard. INVENTION CONTENTS

[0006] The utility model discloses a dry fire arrester for coal mine gas conveying pipeline, which is compact in structure design, small in size, convenient to install and maintain, and capable of meeting the requirements of high flow rate and high pressure for gas conveying.

[0007] To achieve the above object, the utility model provides the following technical scheme: a dry fire arrester for coal mine gas conveying pipeline, which comprises two groups of shell assemblies arranged in mirror image symmetry and a fire blocking part arranged between the two groups of shell assemblies, and a plurality of fasteners are arranged on the fire blocking part to connect the two groups of shell assemblies into one body; the fire blocking part comprises a fire blocking sleeve, radially inwardly recessed step grooves are arranged on the inner walls of the two ends of the fire blocking sleeve, respectively, one fire blocking disc support frame is arranged in each of the two step grooves, a plurality of stainless steel wire meshes are uniformly arranged in the fire blocking sleeve between the two fire blocking disc support frames, and a corrugated plate type fire blocking disc is arranged in the gap between the fire blocking disc support frames and the stainless steel wire meshes; in addition, coaxial through holes are arranged at the shaft centers of the fire blocking disc support frames, the stainless steel wire meshes and the corrugated plate type fire blocking disc, and fasteners are arranged in the through holes.

[0008] Preferably, the shell assembly comprises a connecting flange and a flange connecting pipe connected to the connecting flange, a concentric size head is arranged on the outer wall of the flange connecting pipe, one end of the small pipe diameter of the concentric size head is fixedly connected to the outer wall of the connecting flange, one end of the large pipe diameter of the concentric size head is open and exceeds the opening of the connecting flange, a flange ring is arranged at the large pipe diameter end, the two flange rings are oppositely arranged, a plurality of opposite through holes are uniformly arranged, and fasteners are used to connect the two flange rings into one body.

[0009] Preferably, the connecting flange is a convex flange.

[0010] Preferably, the fastener comprises a long screw rod, threads are arranged at the two ends of the long screw rod, respectively, and fastening nuts are threadedly connected to the long screw rod.

[0011] Preferably, a gasket is arranged between the two groups of shell assemblies and the fire blocking part, respectively.

[0012] Preferably, the dry fire arrester is an explosion type fire arrester, and the safe fire blocking speed is greater than or equal to 1600 m / s.

[0013] Preferably, the dry fire arrester can continuously withstand 13 fire blocking tests, and each test is successful.

[0014] Preferably, the pipe diameter of the dry fire arrester is less than or equal to DN300, and the test pressure is 2.5 MPa.

[0015] Preferably, the pipe diameter of the dry-type flame arrester is greater than DN300, and the test pressure is 2.0 MPa.

[0016] Preferably, when the gas passes through the dry-type flame arrester at an average flow speed of 15 m / s, the pressure drop is less than or equal to 1 kPa.

[0017] Compared with the prior art, the dry-type flame arrester has the following beneficial effects:

[0018] 1. The combination of the flame arrester sleeve, the stainless steel wire mesh and the corrugated plate type flame arrester disc can effectively block the propagation of fire and prevent gas explosion accidents.

[0019] 2. The flame arrester is subjected to strict strength and sealing tests to ensure that it does not leak or permanently deform under high pressure environment, and is suitable for high pressure environment of a coal mine gas conveying pipeline.

[0020] 3. The flame arrester is designed with a mirror-symmetrical shell assembly and a flame arrester part, which is convenient to install and maintain, and is connected by fasteners to ensure the stability of the structure.

[0021] 4. The flame arrester is suitable for gas conveying pipelines with different pipe diameters and can meet the use requirements under different pressure conditions, and has a wide application range.

[0022] 5. When the gas passes through the flame arrester at an average flow speed of 15 m / s, the pressure drop is less than or equal to 1 kPa, which ensures that the efficiency of gas conveying is not affected.

[0023] In summary, the dry-type flame arrester can effectively solve the explosion problem in the coal mine gas conveying pipeline, isolate the propagation of fire, ensure the safety of coal mine production, and has a wide application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a schematic view of the present application;

[0025] Figure 2 is a structural schematic view; Figure 1

[0026] Figure 3 is an enlarged view of A in Figure 2

[0027] Figure 4 is a pressure drop test principle diagram of the dry-type flame arrester;

[0028] Figure 5 is a flame arrester test principle diagram of the dry-type flame arrester;

[0029] ​​In the figure: shell assembly-1, connecting flange-11, flange connecting pipe-12, concentric reducer-13, flange ring-14, fire blocking part-2, fire blocking sleeve-21, stepped groove-22, fire blocking disc support frame-23, stainless steel wire mesh-24, corrugated plate fire blocking disc-25, fastener-3, long screw-31, fastening nut-32, fan pipeline-A1, fan-A2, pitot tube-A3, differential pressure gauge-A4, shock tube flame acceleration section-B1, shock tube observation section-B2, sealing valve-B3, explosion-proof circulating pump-B4, air valve-B5, gas valve-B6, flow meter-B7, spark plug or electric detonator-B8, initiator-B9, data acquisition display-B10, flame detector-B11, pressure sensor-B12. DETAILED DESCRIPTION

[0030] In order to make the technical personnel in the art better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application are described clearly and completely below in combination with the drawings and specific embodiments.

[0031] Please refer to Figures 1-5 , Figure 1 The present application is a schematic diagram; Figure 2 is Figure 1 a structural schematic diagram; Figure 3 is Figure 2 an enlarged view of A in the figure; Figure 4 is a dry fire arrester pressure drop test schematic diagram; Figure 5 is a dry fire arrester fire resistance test schematic diagram.

[0032] The present application provides a kind of dry fire arrester for coal mine gas pipeline, for effectively solve the explosion in coal mine gas pipeline, isolate flame propagation;Including two groups of shell assembly 1 being mirror image symmetry, two groups of shell assembly 1 between being provided with fire blocking part 2, and in the setting of fire blocking part 2 multiple fasteners 3 are provided with two groups of shell assembly 1 and are connected into an organic whole.

[0033] The shell assembly 1 includes connecting flange 11, the connecting flange 11 is convex flange and is provided with flange connecting pipe 12 on pipeline connection side, the outer wall of the flange connecting pipe 12 is provided with the concentric reducer 13 of the opening direction opposite to the direction of the connecting flange 11, and the small pipe diameter of the concentric reducer 13 is fixedly connected with the outer wall of the connecting flange 11, and the large pipe diameter is opened and exceeds the opening of the connecting flange 11, meanwhile, the outer wall of the large pipe diameter end of the concentric reducer 13 is provided with flange ring 14, two flange rings 14 are oppositely arranged, and a plurality of opposite through holes are uniformly provided, and are connected into an organic whole using fastener 3.

[0034] The fire stopping part 2 comprises a fire stopping sleeve 21, the inner wall of both ends of the fire stopping sleeve 21 is respectively provided with a radially inwardly recessed step groove 22, and a fire stopping disc support frame 23 is respectively embedded in the two step grooves 22, a plurality of stainless steel wire meshes 24 are uniformly arranged in the fire stopping sleeve 21 between the two fire stopping disc support frames 23, and a corrugated plate type fire stopping disc 25 is arranged in the gap between the fire stopping disc support frame 23 and the stainless steel wire mesh 24; in addition, coaxial through holes are arranged at the shaft centers of the fire stopping disc support frame 23, the stainless steel wire mesh 24 and the corrugated plate type fire stopping disc 25, and fasteners 3 are arranged in the through holes.

[0035] The fastener 3 comprises a long screw rod 31, both ends of the long screw rod 31 are respectively provided with threads, and fastening nuts 32 are threadedly connected to the threads,

[0036] Two groups of the shell assembly 1 and the fire stopping part 2 are respectively provided with gaskets 4.

[0037] The coal mine gas conveying pipeline dry type fire stopping device is an explosion type fire stopping device, the safety fire stopping speed is greater than or equal to 1600 m / s, the dry type fire stopping device needs to be subjected to strength and sealing tests when leaving the factory, and no leakage occurs during the sealing test, and no cracks or permanent deformation occurs after the strength test; the dry type fire stopping device needs to be subjected to 13 times of fire stopping tests in succession during the inspection, each test must be successful in fire stopping to be qualified, and if the fire stopping fails once, the dry type fire stopping device is considered unqualified.

[0038] During the strength and sealing tests, the dry type fire stopping device is installed at the middle of the fan pipeline A1, a fan A2 is arranged at one end of the fan pipeline A1, and the fan A2 is used for continuously blowing the dry type fire stopping device, a pitot tube A3 is arranged on the pipeline connected to the outlet end of the fan A2 and connected with a differential pressure gauge A4 at a distance of three to six times the pipe diameter from the dry type fire stopping device, meanwhile, the pitot tube A3 is arranged on the pipeline on both sides of the dry type fire stopping device at a distance of less than two times the pipe diameter, and the two pitot tubes A3 are connected with the differential pressure gauge A4 in common; during the detection, the test pressure of the dry type fire stopping device with a pipe diameter less than or equal to DN300 is 2.5 MPa, and the test pressure of the dry type fire stopping device with a pipe diameter greater than DN300 is 2.0 MPa; meanwhile, when the gas with an average flow rate of 15 m / s passes through the dry type fire stopping device, the pressure drop should be less than or equal to 1 kPa.

[0039] When the flame is detected, the shock tube flame acceleration section B1 and the shock tube observation section B2 are respectively installed at two ends of the dry flame arrester, the shock tube flame acceleration section B1 is away from one end of the dry flame arrester, a sealing valve B3 is connected through a pipeline at a position less than two times of the pipe diameter from the end, the other end of the sealing valve B3 is connected through a pipeline with an explosion-proof circulating pump B4, the other end of the explosion-proof circulating pump B4 is connected through a pipeline with the shock tube observation section B2, and the connection point is located at an end of the shock tube observation section B2 away from the dry flame arrester, and the distance from the end is less than two times of the pipe diameter; the pipeline between the sealing valve B3 and the explosion-proof circulating pump B4 is respectively connected with an air valve B5 and a gas valve B6 through branch pipelines, respectively used for air and gas, and the gas valve B6 is further provided with a flow meter B7 between the gas valve B6 and the gas pipeline; a spark plug or an electric detonator B8 is arranged on the shock tube flame acceleration section B1, the spark plug or the electric detonator B8 is electrically connected with an initiator B9 for detonating gas in the shock tube flame acceleration section B1; in addition, a data acquisition display B10 is further provided, the data acquisition display B10 is respectively connected with a plurality of flame detectors B11 arranged on the shock tube flame acceleration section B1 and the shock tube observation section B2, a pressure sensor B12 is further arranged on the shock tube flame acceleration section B1 and connected to the data acquisition display B10; when the dry flame arrester is detected, 13 flame arrester tests are continuously carried out, each test must be successful to be qualified, and if one test fails, it is considered that the flame arrester is unqualified.

[0040] Although the embodiments of the present application have been shown and described, it is apparent that the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, it can be understood by those skilled in the art that all other embodiments obtained by various changes, modifications, replacements and variations of the embodiments without creative labor under the condition of not departing from the principles and spirits of the present application, belong to the protection scope of the present application.

Claims

1. A dry flame arrester for coal mine gas conveying pipelines, characterized in that: The device includes two sets of shell assemblies (1) arranged in a mirror symmetry and a flame arrestor (2) arranged between them. Multiple sets of fasteners (3) are provided on the flame arrestor (2) to connect the two sets of shell assemblies (1) into a whole. The flame arrestor (2) includes a flame arrestor sleeve (21). The inner walls of both ends of the flame arrestor sleeve (21) are respectively provided with radially concave stepped grooves (22). A flame arrestor plate support frame (23) is embedded in each of the two stepped grooves (22). Multiple stainless steel wire meshes (24) are evenly arranged between the two flame arrestor plate support frames (23) inside the flame arrestor sleeve (21). A corrugated plate flame arrestor plate (25) is provided in the gap between the flame arrestor plate support frame (23) and the stainless steel wire mesh (24). In addition, coaxial through holes are provided at the axis of the flame arrestor plate support frame (23), the stainless steel wire mesh (24), and the corrugated plate flame arrestor plate (25), and fasteners (3) are inserted through them.

2. The dry flame arrester for coal mine gas transmission pipelines according to claim 1, characterized in that: The housing assembly (1) includes a connecting flange (11) and a flange connecting pipe (12) connected thereto. A concentric reducer (13) is provided on the outer wall of the flange connecting pipe (12). The smaller diameter end of the concentric reducer (13) is fixed to the outer wall of the connecting flange (11), and the larger diameter end has an opening that extends beyond the opening of the connecting flange (11). A flange ring (14) is provided at the larger diameter end. The two flange rings (14) are arranged opposite each other and have multiple opposite through holes evenly arranged. They are connected into one piece using fasteners (3).

3. The dry flame arrester for coal mine gas transmission pipelines according to claim 2, characterized in that: The connecting flange (11) is a raised face flange.

4. The dry flame arrester for coal mine gas transmission pipelines according to claim 3, characterized in that: The fastener (3) includes a long screw (31), both ends of which are respectively provided with threads and are threadedly connected to fastening nuts (32).

5. The dry flame arrester for coal mine gas transmission pipelines according to claim 4, characterized in that: Gaskets (4) are respectively provided between the two sets of housing components (1) and the flame arrester (2).

6. The dry-type flame arrester for coal mine gas transmission pipelines according to any one of claims 1-5, characterized in that: The dry flame arrester is a detonation type flame arrester with a safe flame arresting speed ≥1600m / s.

7. The dry flame arrester for coal mine gas transmission pipelines according to claim 6, characterized in that: The dry flame arrester underwent 13 consecutive flame arrest tests, and was deemed qualified if it successfully arrested flames in each test.

8. The dry flame arrester for coal mine gas transmission pipelines according to claim 7, characterized in that: The diameter of the dry flame arrester is ≤DN300, and the test pressure is 2.5MPa.

9. The dry flame arrester for coal mine gas transmission pipelines according to claim 7, characterized in that: The diameter of the dry flame arrester is >DN300, and the test pressure is 2.0MPa.

10. The dry flame arrester for coal mine gas conveying pipelines according to claim 8 or 9, characterized in that: When the average gas flow velocity through the dry flame arrester is 15 m / s, the pressure drop is ≤1 kPa.

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