Movable gas centralized discharge device and system installed in coal storage bunker

Abstract

The utility model belongs to the technical field of coal bunker gas treatment systems, and discloses a movable gas centralized discharge device and system installed in a coal storage bunker. The device comprises two rails which are arranged side by side, a gas collecting hood is arranged between the two rails in a sliding mode through a hanging bracket, two discharging connectors are formed in the top of the gas collecting hood, and the gas collecting hood moves to the position above a coal unloading opening in the coal unloading process and covers the coal unloading opening. The gas collecting hood is connected with an extraction branch pipe through an anti-explosion extraction type local ventilator and a telescopic hose and then is connected to a drainage main pipe, and gas gushing out of coal discharged by a coal feeder is drained outdoors through a drainage connector for natural drainage. In addition, when faults are handled and overhauled, only pushing and moving are needed, and normal production is not affected. A new scheme is provided for gas control in the coal storage bunker, concentrated drainage of gas is achieved, dust generated in the coal unloading process of the coal feeder can be discharged in a concentrated mode, and the influence of the dust under the coal storage bunker on the environment is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal bunker gas processing systems, and specifically relates to a mobile gas centralized discharge device and system installed in a coal bunker. Background Art

[0002] Gas control in coal storage bunkers is an important part of coal mine safety production, and is of vital importance for preventing gas accidents and protecting the lives of miners. Due to the high gas content of the coal body underground, the coal stored in the ground coal bunker releases a large amount of gas into the coal bunker, causing gas accumulation in the bunker, which poses a safety hazard to coal mine production. Sometimes it even causes gas explosions in the coal bunker, which is one of the most serious gas disasters on the ground, so preventing excessive gas accumulation in the coal bunker is also a must for coal mine safety work. However, due to the complex gas outburst in the coal bunker and the coal bunker is basically a closed container, this also determines the difficulty and particularity of gas control in the coal bunker.

[0003] At present, in addition to implementing gas monitoring and early warning, the main means of gas control in coal storage bunkers is to take measures to reduce gas concentration to prevent gas explosion accidents. There are two common ways to reduce gas concentration: one is to open a hole in the coal bunker cover, and then connect the air duct to the coal storage bunker and the air space outside the coal bunker, using the principle that gas is lighter than air to diffuse the gas in the bunker to the atmosphere outside the bunker top; the other is to use an explosion-proof local exhaust fan to extend the extraction air duct to the gas accumulation point under the coal storage bunker for gas extraction. During the extraction process, when there is less coal in the bunker, the volume fraction of gas measured from 2m from the top of the coal bunker is 0.8% to 2%. When the stored coal is within 10m from the top of the coal bunker, the volume fraction of gas in the bunker measured at the same position is 1.5% to 3%, and even 2% to 4.58% in summer, which brings unsafe factors to coal entering the coal bunker. During the process of loading and unloading coal near the coal feeder at the lower opening of the coal bunker, gas from the loading and unloading port is released. In addition, the environment under the coal bunker is relatively closed. 0.5 hours after the coal is discharged from the lower opening of the coal bunker, the volume fraction of gas in the space above the coal discharge port reaches 2% to 3%, and the gas near the coal feeder is even as high as 6% to 7%, resulting in high-concentration gas accumulation under the coal bunker, posing a serious gas hazard to the loading and transportation of coal from the ground bunker.

[0004] In addition, climate change will lead to poor gas extraction effect, and the gas over-limit alarm will lock and shut down the power supply. In the summer, when the temperature rises, the weather is dull and the air flow becomes poor. Even if the doors and windows under the coal storage bunker are opened, the gas extraction effect is poor and there is still a gas over-limit alarm. When the temperature drops in winter, insulation measures need to be taken on site, and doors and windows are closed and curtains are hung. Natural ventilation under the coal storage bunker cannot be achieved. If the gas is only extracted by gas fans, the gas extraction effect is poor and there is also a gas over-limit alarm phenomenon.

[0005] Therefore, how to optimize the extraction system of coal storage bunkers, reduce the possibility of gas accumulation, and make reasonable designs according to the actual conditions of coal storage bunkers to ensure that the accumulated gas is extracted and discharged to a safe place is not only an effective means of gas management in coal storage bunkers, but also one of the tasks that need to be solved urgently in the industry. Utility Model Content

[0006] Aiming at the problem that the gas extraction effect of the method of extracting gas by lowering pipes in the background technology will be deteriorated due to climate change. This project aims to study a movable gas centralized extraction device that can be directly applied to the unloading point and gas outflow point of the coal storage bin where gas accumulates. After the gas flows out, it is first extracted by the gas centralized extraction device. The gas concentration in the working environment under the natural release storage bin will inevitably drop significantly, and the gas concentration accumulated in the upper corner of the bin mouth will inevitably drop significantly. The risk of gas exceeding the limit in the gas concentration value monitored by the gas monitoring system is obviously effectively controlled. Based on the above research purpose, the utility model provides a movable gas centralized discharge device and system installed in a coal storage bin.

[0007] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a mobile gas centralized discharge device installed in a coal storage bin, comprising two tracks arranged side by side, a roller is arranged at the top end of the hanger, the roller is arranged in the track to slide the gas collecting hood on the track, two discharge interfaces are arranged on the top of the gas collecting hood, the gas collecting hood moves to the top of the coal unloading port and covers it during the coal unloading process, and the gas gushing out of the coal discharge of the coal feeder is pumped to the outside for natural discharge through a pipeline connected to the discharge interface by the negative pressure effect.

[0008] As a further supplement to the above technical solution, two fixing rings are respectively provided on both sides of the gas collecting hood, and the two fixing rings on the same side are connected by a traction rope. On-site personnel use the traction rope to tow the gas collecting hood to or away from the coal unloading port.

[0009] As a further supplement to the above technical solution, the end of the traction rope is fixed on the traction pull ring to facilitate on-site personnel to drag.

[0010] As a further supplement to the above technical solution, cross beams are fixedly connected between the two ends of the two tracks, a first pulley is installed on each cross beam, and two traction ropes are respectively passed around the first pulleys on both sides to reduce the workload of on-site personnel.

[0011] As a further supplement to the above technical solution, mechanical limit hooks are respectively provided on one side of the two tracks, and the mechanical limit hooks are located above the coal discharge port, and are used to temporarily fix the air collecting hood just above the coal discharge port.

[0012] As a further explanation and limitation of the above technical solution, the mechanical limit hook includes a hinged seat and a hook plate hinged thereon, and the outer sides of the two are connected by tension springs respectively. The hinged seat is fixed on the track, and a strip through hole is provided on the track to facilitate the bent hook end of the hook plate to pass through the track and hook the middle part of the roller shaft under the action of the two tension springs, so that the air collecting hood can be quickly positioned.

[0013] As a further supplement to the above technical solution, the two hook plates are connected by a linkage rod, one end of the pull rope is fixed on the linkage rod, and the other end of the pull rope is passed around the second pulley and fixedly connected to a hand pull ring. The second pulley is fixed on the crossbeam. On-site personnel drag the hand pull ring to make the bent hook ends of the two hook plates rotate around the hinge point at the same time and release the constraints on the middle parts of the two roller shafts, so as to facilitate the later removal of the gas collecting hood away from the coal unloading port.

[0014] As a further supplement to the above technical solution, a curtain is provided on the lower opening of the gas collecting hood, which is used to ensure that the gas collecting hood is tightly closed with the coal discharge port.

[0015] A system of mobile gas centralized emission devices installed in a coal storage bin, comprising the mobile gas centralized emission device of the above scheme, wherein two tracks are installed side by side above a coal unloading point at the coal storage bin, and two emission interfaces located on the same gas collecting hood are respectively connected to extraction branch pipes through telescopic hoses, and the extraction branch pipes are connected to an extraction main pipe, and an electric valve is arranged on each of the extraction branch pipes, and the electric valve is interlockedly controlled with a coal feeder through a DCS control system to ensure that the extraction pipeline is in an open state during the operation of the coal feeder, and a first explosion-proof extraction type local ventilator is installed on the extraction main pipe to provide negative pressure power for the extraction of gas gathered in the gas collecting hood.

[0016] Preferably, a drainage bypass pipe is provided on the drainage main pipe, and a second explosion-proof drainage type local ventilator is installed on the drainage bypass pipe as a backup device for the first explosion-proof drainage type local ventilator, so as to ensure the normal operation of the entire drainage system.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] 1. The utility model adopts a hanger to slide the gas collecting hood between two tracks. Before the coal feeder is turned on during the production process, the gas collecting hood is dragged and moved to the top of the coal discharge port and covers the coal discharge port of the coal feeder. Gas gushes out in large quantities during the coal discharge process. The explosion-proof extraction type local ventilation fan is connected to the extraction branch pipe through a telescopic hose and then connected to the extraction main pipe. The gas gushing out of the coal discharge of the coal feeder is connected to the discharge interface through a pipeline to be discharged outdoors for natural discharge. In addition, when troubleshooting and maintenance are carried out, it only needs to be pushed and moved without affecting normal production. Therefore, the utility model provides a new solution for gas control in coal storage bins, has a demonstration effect and promotion value for gas control under coal storage bins in coal preparation plants in mines, and realizes the centralized extraction of gas and efficient control of dust under coal storage bins.

[0019] 2. After the utility model puts the centralized gas extraction device into use, not only the centralized extraction of gas is realized and the gas is no longer over-limit and is effectively controlled, but also the dust generated during the coal unloading process of the coal feeder can be discharged in a centralized manner, which can replace the dust collector and effectively improve the impact of dust under the coal storage bin on the environment.

[0020] 3. The utility model installs a self-made stretching mechanical limit hook on the track. The bent hook end of the hook plate in the mechanical limit hook slides into the middle of the two roller shafts at the upper end of the hanger after the gas collecting hood moves into place and is hooked under the action of the stretching spring. This can not only make the gas collecting hood quickly positioned at the coal unloading port, but also reduce the number of frequent movements of on-site personnel, thereby reducing labor intensity. At the same time, the mechanical limit hook releases the constraint of the middle of the roller shaft through the pull rope, which is convenient for moving the gas collecting hood away from the coal unloading port at a later time.

[0021] 4. The utility model uses a traction rope to bypass a pulley and adopts a labor-saving dragging method during the movement of the gas collecting hood, which has the advantages of simple operation and low work intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of a mobile gas centralized discharge device in the utility model;

[0023] Figure 2 It is a side view of the mobile gas centralized discharge device in the utility model;

[0024] Figure 3 This is a schematic diagram of the installation of two rails and a mechanical limit hook in the utility model;

[0025] Figure 4 for Figure 3 A magnified view of part A;

[0026] Figure 5 It is a structural diagram of the gas collecting hood in the utility model;

[0027] Figure 6 A reference diagram for use in an embodiment of the utility model;

[0028] Figure 7 This is a system schematic diagram of the mobile gas centralized discharge device adopted in the utility model.

[0029] In the figure: the track is 1, the air collecting hood is 2, the hanger is 3, the discharge interface is 5, the curtain is 6, the fixing ring is 7, the traction rope is 8, the traction pull ring is 9, the mechanical limit hook is 10, the pull rope is 11, the hand pull ring is 12, the crossbeam is 13, the first pulley is 14, the second pulley is 15, and the strip through hole is 16.

[0030] The mechanical limit hook includes: a hinge seat 1001, a hook plate 1002, a linkage rod 1003, and a tension spring 1004

[0031] The system of the mobile gas centralized discharge device includes: a mobile gas centralized discharge device, a telescopic hose 100, a suction branch pipe 200, a suction main pipe 300 connected to each other, a first explosion-proof exhaust type local ventilator 400, an electric valve 500, an exhaust side pipe 600, and a second explosion-proof exhaust type local ventilator 700. DETAILED DESCRIPTION

[0032] In order to further illustrate the technical solution of the utility model, the following Figures 1 to 7 According to the implementation and transformation process of this project and its promotion and application in the coal preparation plant, we further illustrate the utility model through three embodiments.

[0033] Embodiment 1

[0034] As attached Figure 1 , 2 As shown in Figure 6, a mobile gas centralized emission device installed in a coal storage bin includes two rails 1 arranged side by side, and a gas collecting hood 2 is slidably set between the two rails 1 through a hanger 3, that is, a roller 4 is set at the top end of the hanger 3, and the roller 4 is set in the rail 1 to slide the gas collecting hood 2 on the rail 1, and two emission interfaces 5 are set on the top of the gas collecting hood 2. During the coal unloading process, the gas collecting hood 2 moves to the top of the coal unloading port and covers it, and the gas gushing out of the coal discharge of the coal feeder is extracted by negative pressure through a pipeline connected to the emission interface 5 to the outside for natural emission.

[0035] In this embodiment, a curtain 6 can be provided on the lower opening of the gas collecting hood 2 to ensure that the gas collecting hood 2 is tightly closed with the coal discharge port. It should be noted that in order not to affect the observation and operation during the production operation and to realize the visualization of the unloading operation during the production process, we can also choose to make the curtain of transparent material or open a transparent observation area on the gas collecting hood.

[0036] Embodiment 2

[0037] In order to reduce the workload of on-site personnel, the on-site personnel can achieve the purpose of convenience and labor saving when moving the gas collection hood. Figure 1 , 3 As shown in Figure 5, two fixing rings 7 are respectively provided on both sides of the gas collecting hood 2. The two fixing rings 7 on the same side are connected by a traction rope 8. The end of the traction rope 8 is fixed on the traction pull ring 9. A crossbeam 13 is respectively fixedly connected between the two ends of the two tracks 1. A first pulley 14 is installed on each crossbeam 13. The two traction ropes 8 are respectively passed around the first pulleys 14 on both sides. On-site personnel use the traction rope 8 to pull the gas collecting hood 2 to or away from the coal unloading port.

[0038] Embodiment 3

[0039] In order to reduce the number of frequent movements of on-site personnel, the gas collection hood can be quickly positioned at the coal discharge port to further reduce labor intensity. Figures 2 to 4 As shown, we supplement the above two embodiments with a scheme of a mechanical limit hook, and the specific scheme is as follows: the mechanical limit hook 10 is installed on one side of the two rails 1 and is located above the coal unloading port, wherein the mechanical limit hook 10 includes a hinged seat 1001 and a hook plate 1002 hinged thereon, and the outer sides of the two are respectively connected by tension springs 1004, the hinged seat 1001 is fixed on the rail 1, and a strip through hole 16 is provided on the rail 1, so that the bent hook end of the hook plate 1002 passes through the rail 1 and hooks the middle part of the roller 4 shaft under the action of the two tension springs 1004, so that the air collecting hood 2 can be quickly positioned.

[0040] As a preferred implementation scheme of the above embodiment, the two hook plates 1002 are connected by a linkage rod 1003, one end of the pull rope 11 is fixed on the linkage rod 1003, and the other end of the pull rope 11 is passed around the second pulley 15 and fixedly connected to a hand pull ring 12. The second pulley 15 is fixed on the crossbeam 13. On-site personnel drag the hand pull ring 12 to make the bent hook ends of the two hook plates 1002 rotate around the hinge point at the same time and release the constraints on the middle parts of the two roller shafts 4, so as to facilitate the later removal of the gas collecting hood 2 away from the coal unloading port.

[0041] As attached Figure 7As shown, a system of a mobile gas centralized emission device installed in a coal storage bin includes the mobile gas centralized emission device of embodiments one to three above, two tracks 1 are installed side by side above the coal unloading point of the coal storage bin, two emission interfaces 5 located on the same gas collecting hood 2 are respectively connected to the extraction branch pipe 200 through a telescopic hose 100, and the extraction branch pipe 200 is connected to the extraction main pipe 300. An electric valve 500 is arranged on each of the extraction branch pipes 200, and the electric valve 500 is interlocked with the coal feeder through the DCS control system to ensure that the extraction pipeline is in an open state during the operation of the coal feeder. A first explosion-proof extraction type local ventilator 400 is installed on the extraction main pipe 300 to provide negative pressure power for the extraction of the gas gathered in the gas collecting hood 2.

[0042] Furthermore, a drainage bypass pipe 600 is provided on the drainage main pipe 300, and a second explosion-proof extraction type local ventilation fan 700 is installed on the drainage bypass pipe 600 as a backup device for the first explosion-proof extraction type local ventilation fan 400, so as to ensure the normal operation of the entire drainage system.

[0043] After the above mobile gas centralized emission device system was put into use, not only the centralized extraction of gas and the effective control of gas over-limit were achieved, but also the dust generated during the coal unloading process of the coal feeder was discharged in a centralized manner, effectively improving the impact of dust under the coal storage bin on the environment. Although the gas control of the coal preparation plant cannot directly generate economic benefits, gas over-limit is a major liability accident and production accident. Once the gas over-limit occurs, the power will be shut down and production will be stopped. We calculate from the economic benefit aspect: if the production is stopped for 1 hour, 800 tons of raw coal are processed per hour, and the price of raw coal is calculated at 400 yuan / ton, and the gas exceeds the limit 4 times a year, the economic loss caused by gas over-limit in a year is 1 hour * 800 tons * 400 yuan * 4 times = 1.28 million yuan / year.

[0044] After the transformation, this project can replace the dust removal facilities and save the installation of two dust collectors. The market price of the dust collector is 500,000 yuan per unit per day. The cost of installing two dust collectors is 2 units*500,000=1 million yuan.

[0045] To sum up, this project transformation saved the company 2.28 million yuan in production costs and equipment costs.

[0046] The above shows and describes the main features and advantages of the utility model. For those skilled in the art, it is obvious that the specific implementation of the utility model is not limited to the details of the above exemplary embodiments, and the creative ideas and design ideas of the utility model can be realized in other specific forms without departing from the spirit or basic features of the utility model, which should be equivalent to the protection scope disclosed in the technical solution of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, so it is intended to include all changes that fall within the meaning and scope of the equivalent elements of the claims in the utility model.

[0047] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A mobile gas centralized discharge device installed in a coal storage bunker, comprising a hanger (3) and two rails (1) arranged side by side, characterized in that: A roller (4) is provided at the top end of the hanger (3), and the roller (4) is arranged in the track (1) to slide the gas collecting hood (2) on the track (1). Two discharge interfaces (5) are provided on the top of the gas collecting hood (2). During the coal unloading process, the gas collecting hood (2) moves to the top of the coal unloading port and covers it, and utilizes the negative pressure to draw the gas gushing out of the coal unloading of the coal feeder through a pipeline connected to the discharge interface (5) to the outside for natural discharge.

2. The mobile gas centralized discharge device installed in the coal storage bunker according to claim 1 is characterized in that: Two fixing rings (7) are respectively arranged on both sides of the gas collecting hood (2); the two fixing rings (7) on the same side are connected by a traction rope (8); and on-site personnel use the traction rope (8) to traction the gas collecting hood (2) to or away from the coal discharge port.

3. The mobile gas centralized discharge device installed in the coal storage bunker according to claim 2 is characterized in that: The end of the traction rope (8) is fixed on a traction pull ring (9) to facilitate on-site personnel to drag it.

4. The mobile gas centralized discharge device installed in the coal storage bunker according to claim 1 is characterized in that: A crossbeam (13) is fixedly connected between the two ends of the two tracks (1), a first pulley (14) is installed on each crossbeam (13), and two traction ropes (8) are respectively passed around the first pulleys (14) on both sides, so as to reduce the work intensity of on-site personnel.

5. A mobile gas centralized discharge device installed in a coal storage bunker according to any one of claims 1 to 4, characterized in that: Mechanical limit hooks (10) are respectively arranged on one side of the two rails (1), and the mechanical limit hooks (10) are located above the coal discharge port and are used to temporarily fix the gas collecting hood (2) just above the coal discharge port.

6. The mobile gas centralized discharge device installed in the coal storage bunker according to claim 5, characterized in that: The mechanical limit hook (10) includes a hinge seat (1001) and a hook plate (1002) hinged thereon, and the two are connected on the outside by tension springs (1004). The hinge seat (1001) is fixed on the track (1), and a strip through hole (16) is provided on the track (1) to facilitate the bent hook end of the hook plate (1002) to pass through the track (1) and hook the middle part of the roller (4) shaft under the action of the two tension springs (1004), so that the air collecting hood (2) can be quickly positioned.

7. The mobile gas centralized discharge device installed in the coal storage bunker according to claim 6, characterized in that: The two hook plates (1002) are connected by a linkage rod (1003), one end of the pull rope (11) is fixed on the linkage rod (1003), and the other end of the pull rope (11) is passed around the second pulley (15) and fixedly connected to a hand pull ring (12). The second pulley (15) is fixed on the crossbeam (13). On-site personnel use the hand pull ring (12) to drag the hook ends of the two hook plates (1002) to rotate around the hinge point at the same time and release the constraints on the middle parts of the axes of the two rollers (4), so as to facilitate the removal of the gas collecting hood (2) from the coal unloading port at a later time.

8. A mobile gas centralized discharge device installed in a coal storage bunker according to any one of claims 1 to 4 or any one of claims 6 to 7, characterized in that: A barrier curtain (6) is provided on the lower opening of the gas collecting hood (2) to ensure that the gas collecting hood (2) and the coal discharge port are tightly closed.

9. A system of a mobile gas centralized discharge device installed in a coal storage bunker, characterized in that: A mobile gas centralized discharge device installed in a coal storage bin as claimed in any one of claims 1 to 8, wherein two tracks (1) are installed side by side above a coal unloading point at the coal storage bin, and two discharge interfaces (5) located on the same gas collecting hood (2) are respectively connected to a discharge branch pipe (200) through a telescopic hose (100), and the discharge branch pipe (200) is connected to a discharge main pipe (300). An electric valve (500) is arranged on each of the discharge branch pipes (200), and the electric valve (500) is interlockedly controlled with a coal feeder through a DCS control system to ensure that the discharge pipeline is in an open state during the operation of the coal feeder, and a first explosion-proof discharge type local ventilator (400) is installed on the discharge main pipe (300) to provide negative pressure power for the discharge of gas collected in the gas collecting hood (2).

10. A system of a mobile gas centralized discharge device installed in a coal storage bunker according to claim 9, characterized in that: A drainage bypass pipe (600) is provided on the drainage main pipe (300), and a second explosion-proof drainage type local ventilation fan (700) is installed on the drainage bypass pipe (600) as a backup device for the first explosion-proof drainage type local ventilation fan (400), thereby ensuring the normal operation of the entire drainage system.

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