Wet-type slag discharge blowout prevention device

Abstract

This application provides a wet slag discharge and blowout prevention device, relating to the field of gas drainage technology. It includes a main pipe with a connecting assembly at its front end for drill rod passage. An air intake branch pipe is connected to the upper part of the front section of the main pipe, and a slag discharge assembly is connected to the lower part of the front section. An air intake assembly is connected to the left side of the front section of the main pipe, and an air exhaust assembly is connected to the right side of the front section. The air exhaust assembly includes an exhaust pipe, a buffer gas bag, and an air intake main pipe. The main pipe is connected to the buffer gas bag via the exhaust pipe, and the air intake main pipe is connected to the buffer gas bag. This invention replaces existing single-pipe drainage or rigid buffer tank designs with an air exhaust assembly composed of an exhaust pipe, a buffer gas bag, and an air intake main pipe. The flexible buffer gas bag can achieve near-vacuum through initial drainage contraction, eliminating the need for air displacement, solving the problem of delayed gas drainage, and temporarily storing a large amount of gas from a blowout, alleviating the defect of insufficient instantaneous drainage speed in the drainage system, and effectively reducing the risk of gas exceeding limits.

Description

Technical Field

[0001] This application relates to the field of gas extraction technology, and more specifically, to a wet slag discharge anti-blowout device. Background Technology

[0002] For coal seams with outburst risks, gas drainage boreholes must be drilled before mining to eliminate the potential for outbursts. However, during drilling, if a coal seam with high gas pressure is encountered, blowouts often occur, causing large amounts of gas to surge to the working face, threatening operational safety and easily triggering gas accidents.

[0003] Currently, most mainstream blowout preventer devices on the market are directly connected to the gas drainage system via a single conduit. When encountering high-intensity blowouts, these devices cannot promptly drain the large amounts of gas gushing out, still leading to high-value gas exceedances at the working face. Although some coal mines have made improvements by connecting the blowout preventer device's conduit to a rigid buffer tank first, and then from the buffer tank to the drainage system, the rigid buffer tank cannot achieve a vacuum state. The gas generated by the blowout must first displace the air inside the tank before entering the drainage system, and the drainage system lacks the capacity for instantaneous high-flow-rate drainage. Therefore, the improvement effect is limited, and the risk of gas exceedances remains uncontrolled. Summary of the Invention

[0004] The purpose of this application is to provide a wet slag discharge anti-blowout device, which can solve the technical problems mentioned in the background art.

[0005] This application provides a wet slag discharge anti-blowout device, including a main tube. The front end of the main tube is provided with a connecting component for the drill rod to pass through. The upper part of the front section of the main tube is connected to an air intake branch pipe. The lower part of the front section of the main tube is connected to a slag discharge component. The left side of the front section of the main tube is connected to an air intake component. The right side of the front section of the main tube is connected to an exhaust component.

[0006] The exhaust assembly includes an exhaust pipe, a buffer air bag, and an intake dry pipe. The main pipe is connected to the buffer air bag through the exhaust pipe, and the intake dry pipe is connected to the buffer air bag.

[0007] Furthermore, the slag discharge assembly includes a slag discharge pipe, a connecting hose, a slag discharge head, and a sealing ball. One end of the slag discharge pipe is connected to the main pipe, and the other end of the slag discharge pipe is connected to the slag discharge head through the connecting hose. The slag discharge opening of the slag discharge head gradually narrows. The sealing ball is placed inside the slag discharge head, and the diameter of the sealing ball is smaller than the inner diameter of the slag discharge head but larger than the inner diameter of the slag discharge opening of the slag discharge head.

[0008] Furthermore, the sealing ball is a solid metal ball.

[0009] Furthermore, the intake assembly includes an intake pipe and a check valve, one end of the intake pipe is connected to the main body pipe, and the check valve is disposed on the intake pipe.

[0010] Furthermore, the connecting assembly includes a first flange, a second flange, and a gasket. The first flange is fixed to the main body pipe, and the first flange and the second flange are connected by bolts and nuts. The gasket is located between the first flange and the second flange, and the gasket has a through hole in the middle for the drill rod to pass through.

[0011] Furthermore, the buffer air bag is provided with a first connection port, which is fastened to the exhaust pipe by a pipe clamp.

[0012] Furthermore, the buffer air bag is provided with a second connection port, a third flange is fixed at the second connection port, and a fourth flange is fixed at one end of the suction pipe. The third flange and the fourth flange are connected by bolts and nuts, and a sealing ring is provided between the third flange and the fourth flange.

[0013] The beneficial effects of this utility model are:

[0014] This invention replaces the existing design of direct gas extraction via a single conduit or rigid buffer tank by setting up an exhaust assembly consisting of an exhaust pipe, a buffer gas bag, and an intake main pipe. The flexible buffer gas bag does not require pre-emptive air replacement and can achieve a near-vacuum state through pre-extraction, causing the buffer gas bag to flexibly contract. This solves the problem of delayed gas drainage caused by the need to displace air in rigid buffer tanks. The buffer gas bag can temporarily store a large amount of gas that is ejected instantaneously using its own volume, preventing gas from directly rushing to the working face during high-intensity ejection. This alleviates the deficiency of insufficient instantaneous high-flow extraction capacity of the extraction system and effectively reduces the risk of gas exceeding limits. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram (sectional view of the front view) of the structure in some embodiments of this application;

[0017] Figure 2 for Figure 1 A cross-sectional view of the AA axis (where the buffer gas bag and suction tube are not shown);

[0018] The reference numerals in the attached figures are as follows:

[0019] 1. Main pipe; 2. Connecting assembly; 21. First flange; 22. Second flange; 23. Gasket; 231. Through hole; 3. Suction branch pipe; 4. Slag discharge assembly; 41. Slag discharge pipe; 42. Connecting hose; 43. Slag discharge head; 44. Sealing ball; 5. Air intake assembly; 51. Air intake pipe; 52. Check valve; 6. Exhaust assembly; 61. Exhaust pipe; 62. Buffer air bag; 621. First connection port; 622. Second connection port; 63. Suction main pipe; 7. Third flange; 8. Fourth flange; 9. Sealing ring; 10. Pipe clamp. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Specific implementation examples:

[0027] like Figure 1 and Figure 2 As shown, this application provides a wet slag discharge blowout prevention device, including a main pipe 1. The front end of the main pipe 1 is provided with a connecting assembly 2 for drill rods to pass through. The upper part of the front section of the main pipe 1 is connected to an air intake branch pipe 3, the lower part of the front section of the main pipe 1 is connected to a slag discharge assembly 4, the left side of the front section of the main pipe 1 is connected to an air intake assembly 5, and the right side of the front section of the main pipe 1 is connected to an exhaust assembly 6. The exhaust assembly 6 includes an exhaust pipe 61, a buffer air bag 62, and an air intake main pipe 63. The main pipe 1 is connected to the buffer air bag 62 through the exhaust pipe 61, and the air intake main pipe 63 is connected to the buffer air bag 62. Specifically, one end of the exhaust pipe 61 is welded to the main pipe 1, and the other end of the exhaust pipe 61 is connected to... The buffer gas bag 62 is connected, and the exhaust assembly 6, consisting of an exhaust pipe 61, a buffer gas bag 62, and an intake main pipe 63, replaces the existing design of direct extraction from a single conduit or a rigid buffer tank. The flexible buffer gas bag 62 does not require pre-purge of the internal air. It can achieve a near-vacuum state by flexibly contracting the buffer gas bag 62 through pre-extraction. This solves the problem of delayed gas drainage caused by the need to displace air in rigid buffer tanks. The buffer gas bag 62 can use its own volume to temporarily store a large amount of gas that is gushing out instantaneously, preventing gas from directly rushing to the working face during high-intensity eruptions. This alleviates the deficiency of insufficient instantaneous large-flow extraction capacity of the extraction system and effectively reduces the risk of gas exceeding limits.

[0028] like Figure 2As shown, the slag discharge assembly 4 includes a slag discharge pipe 41, a connecting hose 42, a slag discharge head 43, and a sealing ball 44. One end of the slag discharge pipe 41 is welded to the main body pipe 1, and the other end of the slag discharge pipe 41 is connected to the slag discharge head 43 through the connecting hose 42. The slag discharge opening of the slag discharge head 43 gradually narrows. The sealing ball 44 is placed inside the slag discharge head 43. The diameter of the sealing ball 44 is smaller than the inner diameter of the slag discharge head 43 but larger than the inner diameter of the slag discharge opening of the slag discharge head 43. Specifically, one end of the connecting hose 42 is sleeved on the slag discharge head 43. The end of the slag pipe 41 away from the main pipe 1 is fastened with a pipe clamp 10. The other end of the connecting hose 42 is fitted onto the slag inlet end of the slag discharge head 43 and fastened with a pipe clamp 10. The setting of the connecting hose 42 makes it easy for the staff to adjust the horizontal angle of the slag discharge head 43. The progressive contraction structure of the slag discharge head 43 cooperates with the sealing ball 44 to smoothly discharge slag water during normal slag discharge. When the gas injection hole is activated, the gas pressure will automatically trigger the sealing, and it can respond quickly without the need for additional control devices.

[0029] like Figure 2 As shown, the sealing ball 44 is a solid metal ball; specifically, the solid metal ball is made of aluminum alloy. In wet slag discharge scenarios, the sealing ball 44 is in long-term contact with water containing coal slag. A dense oxide film easily forms on the surface of the aluminum alloy, which can effectively isolate the water and coal slag from the substrate, prevent rust or corrosion, and extend the service life. In addition, the solid metal sealing ball 44 has sufficient weight and structural strength. During normal slag discharge, it will not move arbitrarily due to slight water flow disturbance, ensuring smooth slag discharge passage. During spraying, it can quickly move to the progressively contracting slag discharge port of the slag discharge head 43 under the high pressure of gas to form a seal and prevent gas leakage.

[0030] like Figure 1 As shown, the air intake assembly 5 includes an air intake pipe 51 and a check valve 52. One end of the air intake pipe 51 is connected to the main pipe 1, and the check valve 52 is installed on the air intake pipe 51. During the normal drilling and slag removal stage, the external air source can enter the main pipe 1 through the air intake pipe 51 to compensate for the airflow. This can help push the slag-water mixture in the main pipe 1 to move towards the slag removal assembly 4, thereby improving the slag removal efficiency. At this time, the check valve 52 remains open under the thrust of the airflow to ensure a smooth air intake passage. When a gas eruption occurs, the gas pressure in the main pipe 1 rises sharply and is much greater than the external air intake pressure. The high-pressure gas will act in the opposite direction on the check valve 52, pushing the check valve 52 to automatically close the passage of the air intake pipe 51, preventing the high-pressure gas in the main pipe 1 from leaking to the outside through the air intake pipe 51. At the same time, it cuts off the entry of external gas into the main pipe 1, preventing the external gas from mixing with the gas to form a dangerous gas environment. Specifically, the check valve 52 is a horizontal check valve.

[0031] like Figure 2As shown, the connecting assembly 2 includes a first flange 21, a second flange 22, and a gasket 23. The first flange 21 is fixed to the main body pipe 1. The first flange 21 and the second flange 22 are connected by bolts and nuts. The gasket 23 is located between the first flange 21 and the second flange 22. The gasket 23 has a through hole 231 in the middle for the drill rod to pass through. The bolt connection between the first flange 21 and the second flange 22 makes it easy to install and remove gaskets 23 with different through hole diameters 231 according to actual needs, so that the gasket 23 can be adapted to the size of the drill rod.

[0032] like Figure 1 As shown, the buffer air bag 62 is provided with a first connection port 621, and the first connection port 621 is fastened to the exhaust pipe 61 by a pipe clamp 10; the pipe clamp 10 is easy to connect and disassemble.

[0033] like Figure 1 As shown, the buffer air bag 62 is provided with a second connection port 622, a third flange 7 is fixed at the second connection port 622, and a fourth flange 8 is fixed at one end of the suction pipe 63. The third flange 7 and the fourth flange 8 are connected by bolts and nuts, and a sealing ring 9 is provided between the third flange 7 and the fourth flange 8; the flange connection is easy to disassemble and assemble.

[0034] Working principle:

[0035] First, drill a hole in the coal seam using a drill bit. The diameter of the drill bit is slightly larger than the outer diameter of the main body pipe 1 of this device. The drilling depth is about 1m. After drilling, retract the drill rod, remove the drill bit, and put this device on the drill rod. The drill rod passes through the through hole 231 of the rubber pad 23 and exits from the rear end of the main body pipe 1. Then install the drill bit with the designed hole diameter, move the drill rod forward, and place the rear section of the main body pipe 1 of this device into the previously drilled hole. The suction branch pipe 3 and the suction main pipe 63 are connected to the gas drainage pipeline, and suitable drainage valves are installed on the suction branch pipe 3 and the suction main pipe 63. Open the drainage valves on the fine suction branch pipe and the suction main pipe 63. The buffer gas bag 62 is sucked down (flexible contraction occurs during drainage) to a near vacuum. After the gas drainage pipeline sucks down the buffer gas bag 62, it will still suck away a small amount of gas from the chamber of the buffer gas bag 62. Drilling begins, and the slag water enters the main body pipe 1. The slag flows from the discharge pipe 41 through the connecting hose 42, and then out of the slag outlet of the discharge head. The check valve on the air inlet pipe 51 opens, and the airflow compensation begins. When the spray occurs, a pressure impact is generated, the check valve closes automatically, and the sealing ball 44 inside the discharge head 43 is impacted by the slag, water, and airflow, moving forward to seal the discharge outlet of the discharge head 43. A large amount of gas enters the buffer gas bag 62 through the exhaust pipe 61, and the gas extraction pipeline quickly sucks away the gas in the buffer gas bag 62 through the suction main pipe 63. When the spray ends, the sealing ball 44 rolls down, opening the discharge outlet of the discharge head 43, and normal slag and water discharge begins. The check valve opens, and the airflow compensation begins. The buffer gas bag 62 continues to deflate, and the cycle continues. When the spray intensity is high and the duration is long, some slag and water will enter the buffer gas bag 62. At this time, the buffer gas bag 62 needs to be manually removed and emptied.

[0036] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A wet-type blowout preventer for a slag discharge, characterized by comprising: The system includes a main tube, the front end of which is provided with a connecting assembly for the drill rod to pass through, the upper part of the front section of the main tube is connected to an air intake branch pipe, the lower part of the front section of the main tube is connected to a slag discharge assembly, the left side of the front section of the main tube is connected to an air intake assembly, and the right side of the front section of the main tube is connected to an exhaust assembly. The exhaust assembly includes an exhaust pipe, a buffer air bag, and an intake dry pipe. The main pipe is connected to the buffer air bag through the exhaust pipe, and the intake dry pipe is connected to the buffer air bag.

2. A wet underflow blowout preventer as defined in claim 1, wherein: The slag discharge assembly includes a slag discharge pipe, a connecting hose, a slag discharge head, and a sealing ball. One end of the slag discharge pipe is connected to the main pipe, and the other end of the slag discharge pipe is connected to the slag discharge head through the connecting hose. The slag discharge opening of the slag discharge head gradually narrows. The sealing ball is placed inside the slag discharge head. The diameter of the sealing ball is smaller than the inner diameter of the slag discharge head but larger than the inner diameter of the slag discharge opening of the slag discharge head.

3. A wet discharging blowout preventer according to claim 2, characterized in that: The sealing ball is a solid metal ball.

4. A wet underflow blowout preventer as defined in claim 1, wherein: The intake assembly includes an intake pipe and a check valve. One end of the intake pipe is connected to the main body pipe, and the check valve is disposed on the intake pipe.

5. A wet underflow blowout preventer as defined in claim 1, wherein: The connecting assembly includes a first flange, a second flange, and a gasket. The first flange is fixed to the main body pipe, and the first flange and the second flange are connected by bolts and nuts. The gasket is located between the first flange and the second flange, and the gasket has a through hole in the middle for the drill rod to pass through.

6. A wet underflow blowout preventer as defined in claim 1, wherein: The buffer air bag is provided with a first connection port, which is fastened to the exhaust pipe by a pipe clamp.

7. A wet discharging blowout preventer according to claim 6, characterized in that: The buffer air bag is provided with a second connection port, a third flange is fixed at the second connection port, and a fourth flange is fixed at one end of the air intake pipe. The third flange and the fourth flange are connected by bolts and nuts, and a sealing ring is provided between the third flange and the fourth flange.

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