A method of centrally controlling and sampling gas blowdown

Abstract

The application discloses a kind of centralized control and sampling coal gas diffusion method, it is related to coal gas diffusion technical field, to solve the problem that existing coal gas diffusion pipe has greater security risk, sampling operation is inconvenient;The centralized diffusion reconstruction of the present application includes the additional centralized diffusion pipe, multiple scattered diffusion pipes and the support fixed on the operation platform, wherein the lower end of the centralized diffusion pipe is provided with a bottom plate, which is provided with the same number of through holes as the scattered diffusion pipe, each through hole is connected with the gas outlet on the upper end of one scattered diffusion pipe;The outer periphery of the centralized diffusion pipe is fixed with multiple lifting lugs, and each lifting lug is arranged on the support;The end of the scattered diffusion pipe away from the centralized diffusion pipe is communicated to the coal gas main pipeline, and each scattered diffusion pipe is provided with a block valve and an analysis sampling device above the operation platform, respectively, and each block valve and analysis sampling device is centrally arranged;The present application does not need to struggle rope, is easy to fix firmly, is provided with lightning protection device, eliminates security risk, and sampling and control operation is convenient.

Description

Technical Field

[0001] This invention relates to the field of gas venting technology, specifically a method for centralized control and sampling of gas venting. Background Technology

[0002] In gas systems, gas vent pipes are often installed for gas replacement and purging. Due to the toxicity and fire prevention requirements of gas, certain requirements are placed on the layout of these vent pipes. For example, Article 7.3.1.2 of the "Safety Regulations for Gas in Industrial Enterprises" (GB 6222-2005) stipulates that the vent pipe opening should be 4m higher than the gas pipeline, equipment, and walkway, and no less than 10m above the ground. In actual engineering projects, gas vent pipes often have small diameters and long riser lengths, making them susceptible to strength or fatigue failure due to long-term exposure to wind loads. Therefore, they are generally secured with ropes. Figure 1 The middle part refers to multiple existing gas vent pipes, which have a simple structure and are generally fixedly installed at the upper end of the main gas pipeline located on the operating platform. The pipeline is equipped with manual valves and analysis and sampling devices. The tension rope can only play a role when the angle of force between the tension rope and the gas vent pipe is within a certain range. The invention patent with announcement number CN205136946U, entitled "A Centralized Vent Pipe", discloses a method in which three tie plates are evenly distributed along the circumference on the outer surface of the vent pipe. Each tie plate is fixed to the foundation by a tie line. The tie line in this patent is this kind of fixing structure.

[0003] However, due to site limitations, the dispersed location and large number of vent pipes, it is often difficult to find suitable fixing points for the venting rope, which affects the fixing effect of the venting rope and poses a huge safety hazard of gas vent pipe tipping over.

[0004] Meanwhile, existing gas venting devices also have the following problems:

[0005] (1) Manual valves and analysis and sampling devices are installed on the gas venting pipeline. However, the diameter of the main gas pipe is usually large, making it difficult for operators to open and close the valves and take samples. A separate platform needs to be set up for high-altitude operations, which increases investment costs and also brings the risk of operators falling from heights, posing a safety hazard.

[0006] (2) The gas venting pipeline is an independent tall building, and the gas is a flammable medium, which poses a safety hazard of lightning accidents. It is not easy to install lightning protection devices on the existing gas venting pipeline.

[0007] In summary, there is an urgent need for a centralized control and sampling method for gas venting to solve these problems. Summary of the Invention

[0008] The purpose of this invention is to provide a centralized control and sampling method for coal gas venting, so as to solve the problems of significant safety hazards and inconvenient sampling operations in existing coal gas venting pipes.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a method for centralized control and sampling of coal gas venting, comprising the following specific contents:

[0010] Remove the original vent pipe: Remove the ropes used to fix the original vent pipe from the operating platform of the gas main pipeline where the vent pipe was originally installed, and remove the multiple original vent pipes at the top of the gas main pipeline.

[0011] Centralized venting modification: Add a centralized venting pipe, multiple scattered venting pipes, and a support fixed on the operating platform. The lower end of the centralized venting pipe is equipped with a base plate with the same number of through holes as the scattered venting pipes. Each through hole is connected to the gas outlet at the upper end of a scattered venting pipe. Multiple lifting lugs are fixed to the outer periphery of the centralized venting pipe, and each lifting lug is supported on the support. The end of the scattered venting pipe away from the centralized venting pipe is connected to the main gas pipeline. Each scattered venting pipe is equipped with an isolation valve and an analytical sampling device above the operating platform. The isolation valves and analytical sampling devices are centrally located.

[0012] Rain and lightning protection measures: A rain cap is fixedly installed at the upper end of the centralized vent pipe, with a gap between the two for air venting. A lightning protection device is fixedly installed at the upper end of the rain cap.

[0013] When it is necessary to operate the isolation valve and the analytical sampling device, the operation can be carried out directly next to the support on the main gas pipeline operating platform.

[0014] Preferably, the upper end of the base plate is filled with a porous material that does not react with the gas inside the centralized venting pipe, which is used to disperse and even out the gas flow from different scattered venting pipes.

[0015] Preferably, the porous material is a honeycomb-shaped perforated plate, or a container filled with ferric hydroxide, and the surface of the container is evenly distributed with a large number of venting holes that connect the inside and outside of the container.

[0016] Preferably, the support is frame-shaped and surrounds the outer periphery of the centralized venting pipe. At least three lifting lugs are provided and arranged in a circular array around the center line of the centralized venting pipe and welded to the centralized venting pipe. The lifting lugs are only erected on the support or are welded to the support after erection.

[0017] Preferably, the lifting lugs are provided in multiple groups, with 4 lugs in each group and located at the same height. The support has a frame at the lower end of the height of each group of lifting lugs to support each group of lifting lugs. The height distance between adjacent groups of lifting lugs is 3-5 meters.

[0018] Preferably, the lightning protection device is welded and fixed to the rainproof cap, and the lightning protection device is connected to the entire plant's lightning protection grounding network.

[0019] Preferably, the distance between the isolation valve and the analytical sampling device and the upper part of the operating platform is no more than 2 meters.

[0020] Preferably, the modified centralized venting device is fixed in one corner of the operating platform; there are at least three scattered venting pipes, which are respectively connected to the front of the main gas pipeline butterfly valve, the back of the blind valve, and between the butterfly valve and the blind valve.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. This centralized control and sampling method for gas venting eliminates the need for ropes and cables in various locations. By using supports for centralized installation, it is easy to fix securely and solves the problems of lack of suitable fixing points, unstable fixing, and potential tipping hazards when using ropes to fix gas venting pipelines. At the same time, it avoids the clutter and inconvenience caused by ropes occupying the operating platform space.

[0023] 2. This centralized control and sampling method for gas venting integrates the gas isolation valve and the analysis and sampling device and brings them to an easily accessible location. This solves the problems of difficult operation of gas venting pipeline valves and analysis and sampling devices, which previously required additional operating platforms. This reduces enterprise investment and shortens the construction period.

[0024] 3. This centralized control and sampling method for gas venting is equipped with lightning protection devices, which solves the problem that it is not easy to install lightning protection devices on gas venting pipelines, thus posing a safety hazard due to lightning accidents. Attached Figure Description

[0025] Figure 1 A three-dimensional structural diagram of the existing gas vent pipe installation location;

[0026] Figure 2 This is a schematic diagram of the centralized venting device of the present invention;

[0027] Figure 3 This is a three-dimensional structural diagram of the installation location of the present invention.

[0028] In the diagram: 1. Centralized vent pipe; 2. Scattered vent pipe; 3. Rain cap; 4. Lightning protection device; 5. Isolation valve; 6. Analytical sampling device; 7. Lifting lug; 8. Porous material; 9. Base plate. Detailed Implementation

[0029] See Figure 1 To facilitate valve control and sampling, existing gas vent pipes are typically located on the operating platform where the main gas pipeline is situated, specifically at the upper end of the main gas pipeline on the platform. Each vent pipe requires at least three anchoring ropes for secure installation. However, in many cases, space on the operating platform is limited, making it impossible to install anchoring ropes in a perfectly uniform distribution, resulting in issues such as… Figure 1The more complex and even chaotic cable pulling methods shown in the diagram are often limited by space, making it difficult to achieve a secure rope angle. In addition, since the vent pipe is originally located at the top of the main gas pipeline, which is already at a high position, it is difficult to install a lightning protection device at the top of the vent pipe in order to ensure the stability of the rope fixation, which also leads to the safety hazard of lightning strikes.

[0030] To completely eliminate the various safety problems in the aforementioned background technology, the present invention provides a centralized control and sampling method for coal gas venting, including the following specific contents:

[0031] Remove the original vent pipe: Remove the ropes used to fix the original vent pipe from the operating platform of the gas main pipeline where the vent pipe was originally installed, and remove the multiple original vent pipes at the top of the gas main pipeline.

[0032] Centralized and decentralized transformation: such as Figure 2 and 3 As shown, a centralized vent pipe 1, multiple scattered vent pipes 2, and a support fixed on the operating platform are added. The lower end of the centralized vent pipe 1 is provided with a base plate 9, which has the same number of through holes as the scattered vent pipes 2. Each through hole is connected to the gas outlet at the upper end of a scattered vent pipe 2. Multiple lifting lugs 7 are fixed on the outer periphery of the centralized vent pipe 1, and each lifting lug 7 is supported on the support. The end of the scattered vent pipe 2 away from the centralized vent pipe 1 is connected to the main gas pipeline. Each scattered vent pipe 2 is provided with an isolation valve 5 and an analysis and sampling device 6 above the operating platform. The isolation valves 5 and analysis and sampling devices 6 are centrally located. For ease of operation, the height of the isolation valves 5 and analysis and sampling devices 6 from the top of the operating platform should not exceed 2 meters. It is more preferable to set them at a height of 1-1.5m above the operating platform, such as about 1.3m. This allows for centralized control and sampling, making operation convenient and eliminating the need for a separate operating platform.

[0033] Rain and lightning protection measures: A rain cap 3 is fixedly installed at the upper end of the centralized venting pipe 1, with a gap between the two for air venting. A lightning protection device 4 is fixedly installed at the upper end of the rain cap 3. For reference, the lightning protection device 4 can be welded and fixed to the rain cap 3. The lightning protection device 4 can be connected to the original whole plant lightning protection grounding network, thus eliminating the lightning safety hazard of the venting device.

[0034] When it is necessary to operate the isolation valve 5 and the analysis and sampling device 6, the operation can be carried out directly next to the support on the main gas pipeline operating platform.

[0035] To disperse and unify the airflow from different scattered venting pipes 2 and eliminate mutual interference between airflows during centralized venting, a porous material 8 can be filled inside the centralized venting pipe 1 at the upper end of the base plate 9. It is important to note that the material 8 should not react chemically with the gas. For example, materials such as iron-based or silicon-based materials can be used. For reference, the porous material 8 can be a honeycomb perforated plate, or a container or carrier filled with packing materials such as ferric hydroxide. Its surface should be evenly distributed with a large number of vent holes connecting the inside and outside of the container. It is important to ensure that the pore size is large enough to prevent the packing material from leaking.

[0036] In a preferred embodiment, such as Figure 2 As shown, the support frame can be frame-shaped and surrounds the outer periphery of the centralized venting pipe 1. At least three lifting lugs 7 are arranged in a circular array around the centerline of the centralized venting pipe 1 and welded to it. The lifting lugs 7 are either erected on the support frame or, after erection, welded to it. Depending on the overall height, multiple sets of lifting lugs 7 can be further provided, with four lugs in each set at the same height. A frame is provided at the lower end of each set of lifting lugs 7 to support each set. The height spacing between adjacent sets of lifting lugs 7 is 3-5 meters.

[0037] In addition, under normal circumstances, at least three scattered vent pipes 2 are provided, respectively connected to the main gas pipeline before the butterfly valve, after the blind valve, and between the butterfly valve and the blind valve, to meet the needs of analysis and sampling. For reference, the centralized control and sampling gas venting method should be fixed in a corner of the operating platform to leave sufficient operating space, making sampling and control operations more convenient. Specifically, it can be done as follows: Figure 3 The scattered vent pipe 2 is installed through the floor of the operating platform.

[0038] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

[0039] Any aspects of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A method of centrally controlling and sampling a gas release, characterized in that, Includes the following specific content: Remove the original vent pipe: Remove the ropes used to fix the original vent pipe from the operating platform of the gas main pipeline where the vent pipe was originally installed, and remove the multiple original vent pipes at the top of the gas main pipeline. Centralized venting modification: A centralized venting pipe (1), multiple scattered venting pipes (2), and a support fixed on the operating platform are added. The lower end of the centralized venting pipe (1) is provided with a base plate (9), which has the same number of through holes as the scattered venting pipes (2). Each through hole is connected to the gas outlet at the upper end of a scattered venting pipe (2). Multiple lifting lugs (7) are fixed on the outer periphery of the centralized venting pipe (1), and each lifting lug (7) is erected on the support. The end of the scattered venting pipe (2) away from the centralized venting pipe (1) is connected to the main gas pipeline. Each scattered venting pipe (2) is provided with an isolation valve (5) and an analysis sampling device (6) above the operating platform. The isolation valves (5) and analysis sampling devices (6) are centrally located. The upper end of the base plate (9) is filled with a porous material (8) that does not react with gas inside the centralized venting pipe (1) to disperse and evenly distribute the airflow from different scattered venting pipes (2). The porous material (8) is a honeycomb-shaped perforated plate or a container filled with fluffy iron hydroxide, and the surface of the container is evenly distributed with a large number of vent holes that connect the inside and outside of the container; the support is frame-shaped and surrounds the outer periphery of the centralized venting pipe (1); the lifting lugs (7) are provided with at least 3 and are arranged in a circular array with the center line of the centralized venting pipe (1) as the axis and welded and fixed to the centralized venting pipe (1); the lifting lugs (7) are only erected on the support or are welded and fixed to the support after erection; the lifting lugs (7) are provided in multiple groups, each group has 4 and are located at the same height; the support is provided with a frame at the lower end of the height of each group of lifting lugs (7) to support each group of lifting lugs (7); the height spacing between adjacent groups of lifting lugs (7) is 3-5 meters; the modified centralized venting device is fixed in one corner of the operating platform; the scattered venting pipes (2) are provided with at least three, which are respectively connected to the front of the main gas pipeline butterfly valve, the back of the blind valve, and between the butterfly valve and the blind valve; Rain and lightning protection measures: A rain cap (3) is fixedly installed at the upper end of the centralized vent pipe (1), with a gap between the two for air venting. A lightning protection device (4) is fixedly installed at the upper end of the rain cap (3). When it is necessary to operate the isolation valve (5) and the analysis and sampling device (6), the operation can be carried out directly next to the support on the main gas pipeline operation platform.

2. A centrally controlled and sampled gas bleed-off method according to claim 1, characterized in that: The lightning protection device (4) is welded and fixed to the rain cap (3), and the lightning protection device (4) is connected to the whole plant's lightning protection grounding network.

3. A centrally controlled and sampled gas bleed-off method according to claim 1, characterized in that: The isolation valve (5) and the analysis and sampling device (6) are both no more than 2 meters above the top of the operating platform.

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