Dedusting system for fully-mechanized excavation face of rock roadway under phosphorite well

Abstract

The utility model discloses a dust removal system for a fully mechanized excavation face of a rock roadway under a phosphorite well, which comprises a dust control system and a dust collection system, and the dust control system comprises a press-in fan and a press-in air duct which are connected in sequence; the dust collecting system comprises a draw-out type fan, a draw-out type air duct, a dust removing water tank and a dust falling air duct, the negative pressure end of the draw-out type fan is connected with the draw-out type hard air duct, the positive pressure end of the draw-out type fan is connected with the draw-out type soft air duct, the other end of the draw-out type soft air duct is connected with an air inlet of the dust removing water tank, and an air outlet of the dust removing water tank is connected with the dust falling air duct. According to the dust removal system provided by the utility model, a dust removal mode of'front-end dry dust extraction and rear-end water mist dust reduction 'is adopted, so that ores are prevented from being muddy into slurry, dust is prevented from overflowing, and the dust removal effect is good; the system is simple in structure and easy to set, and meets the operation requirements of phosphorite fully-mechanized excavation dust removal.

Description

Technical Field

[0001] The utility model relates to the technical field of dust removal in the roadway / tunnel construction of phosphorus mines, and particularly relates to a dust removal system for the comprehensive tunneling face of the rock roadway in the phosphorus mine underground. Background Technique

[0002] At present, traditional blasting methods are generally used for the underground rock roadway tunneling construction in underground phosphorus mines, which mainly include four links: drilling, blasting, mucking, and support. The characteristic is that only the blasting operation is likely to generate a large amount of dust. Therefore, a single local ventilator forced ventilation dust removal method is adopted at the working face, and the dust can be reduced to within the safe operation requirement range after 30 minutes of ventilation. However, the construction links of the traditional blasting method are numerous and complex, and the labor intensity of the operation is large, which can no longer meet the requirements of modern rapid production. The full-face tunneling machine is a comprehensive mechanized equipment integrating multiple functions such as tunneling, rock loading, coal transportation, and even support and track laying. The application of the full-face tunneling machine in the phosphorus ore rock roadway tunneling is the trend of modern development. When the underground roadway adopts full-face tunneling operation, continuous cutting of ore and rock operations will continuously generate a large amount of dust. The single local ventilator forced ventilation dust removal method used in the traditional blasting method can no longer meet the requirements of full-face tunneling dust removal, seriously threatening the safety and work efficiency of the operators.

[0003] The existing treatment methods for the large amount of dust generated by the comprehensive tunneling of the roadway are mainly two methods: wet dust removal and dry dust removal. The equipment used in the dry dust removal method is large and complex in volume, and it cannot be installed and used or is extremely inconvenient to use in the narrow space of the underground roadway of the phosphorus mine. The wet dust reduction method of spraying foam on the tunneling face or spraying water mist on the operation point will increase the water content of the cut ore. The phosphorus ore, especially the fine-grained phosphorus ore, is easy to be slurred into slurry when encountering water, affecting the handling of the ore, especially having a great impact on the ore pass discharging and the underground belt transportation. And the foam dust removal has strict ratio requirements for the used foam, with high operation difficulty, requiring professional technical personnel. The raw material composition is numerous and complex, which is a cost burden for the low-cost mine and affects the economy; moreover, the foam and its raw materials are all chemical components, which will inevitably pollute the working face and even the underground ambient air. Content of the Utility Model

[0004] In view of this, the utility model provides a dust removal system for the comprehensive tunneling face of the rock roadway in the phosphorus mine underground, aiming to solve the problems encountered in the dust removal of the phosphorus mine comprehensive tunneling face proposed in the above background technique, including (1) a single dust removal method cannot meet the dust reduction requirements of continuous comprehensive cutting operation; (2) the dry dust collector is large in volume and cannot be applied to the narrow underground roadway of the phosphorus mine; (3) the wet dust removal of the full-face tunneling face is not applicable to the phosphorus mine; (4) the foam dust removal is difficult to operate and the chemical components pollute the underground air.

[0005] To achieve the above object, the utility model adopts the following technical solutions: The utility model provides a dust removal system for a comprehensive tunneling face in a phosphorus mine roadway. It includes a dust control system arranged on one side of the roadheader and a dust collection system on the other side. The dust control system includes a forced ventilation fan and a forced ventilation duct connected in sequence. The dust collection system includes an exhaust fan, an exhaust duct, a dust removal water tank, and a dust reduction duct. The exhaust duct includes a rigid exhaust duct and a flexible exhaust duct. The negative pressure end of the exhaust fan is connected to the rigid exhaust duct, and the positive pressure end is connected to the flexible exhaust duct. The other end of the flexible exhaust duct is connected to the air inlet of the dust removal water tank, and the air outlet of the dust removal water tank is connected to the dust reduction duct. The dust removal water tank includes a water curtain dust removal part and a packing dust removal part. The water curtain dust removal part includes a high-pressure water pipe I arranged at the top of the dust removal water tank. The packing dust removal part includes a dust removal ball plate arranged inside the dust removal water tank and a high-pressure water pipe II arranged on the side wall of the dust removal water tank. The high-pressure water pipe II is adjacent to the dust removal ball plate.

[0006] Further, the air outlet of the forced ventilation duct is arranged behind the roadheader at a distance of 0 - 12 m from the operation platform.

[0007] Further, the air inlet of the rigid exhaust duct is less than 2 m away from the comprehensive tunneling face.

[0008] Further, the length of the rigid exhaust duct is 18 - 30 m.

[0009] Further, the length of the dust reduction duct is ≥ 3 m.

[0010] Further, the water curtain dust removal part is arranged on the air inlet side of the dust removal water tank, and the packing dust removal part is arranged on the air outlet side of the dust removal water tank.

[0011] Further, the dust removal ball plate is composed of a wire mesh and dust removal balls fixed inside the wire mesh.

[0012] In the dust removal system provided by the utility model, the forced ventilation fan is arranged in the external fresh air flow. The forced ventilation duct is connected to the forced ventilation fan, and its air outlet is arranged behind the roadheader at a distance of 0 - 12 m from the operation platform, for pressing fresh air to the tunneling face.

[0013] The exhaust fan is used to extract a large amount of dust from the working face into the dust removal water tank. The exhaust fan is arranged on the other side of the operation platform behind the roadheader, 18 - 30 m away from the tunneling face. The negative pressure end is connected to the rigid duct, and its air inlet is not more than 2 m away from the tunneling face. The positive pressure end is connected to the air inlet of the dust removal water tank arranged in the return air roadway through a flexible duct. The air outlet of the dust removal water tank is connected to a 3 - meter-long dust reduction duct to achieve further dust reduction.

[0014] The working flour dust is extracted by an extraction air duct and then enters the interior of the dust removal water tank. After first being dust-removed by the water curtain dust removal part of the dust removal water tank, it is then dust-removed by the packing dust removal part. After that, it flows into the dust reduction air duct from the bottom of the air outlet along with the water flow and is discharged. The water mist blown by the dust removal water tank can further reduce the residual dust in the dust reduction air duct. The two dust reduction barriers set inside the dust removal water tank improve the dust removal efficiency. Moreover, the high-pressure water pipes arranged outside the dust removal ball plate in the packing dust removal part can not only play the role of water curtain dust removal, but also continuously wash the dust removal balls on the dust removal ball plate to ensure the dust adsorption effect of the dust removal balls.

[0015] In summary, compared with the prior art, the utility model has the following beneficial technical effects:

[0016] The dust removal system for the comprehensive excavation face of rock headings in phosphate mines provided by the utility model adopts a dust removal method of "front-end dry dust extraction + rear-end water mist dust reduction", which can ensure that the ore does not turn into mud and slurry and the dust does not overflow, and has a good dust removal effect; the system has a simple structure and is easy to set up. The equipment used has a small volume and is easy to move or transfer along with the tunneling of the roadway, meeting the operation requirements of dust removal for comprehensive excavation of phosphate mines. Moreover, the dust removal water tank is internally provided with a double dust reduction barrier, with high dust removal efficiency. At the same time, the dust removal water tank has a simple structure, is easy to set up, is highly efficient and durable, and has strong economy. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the dust removal system provided by an embodiment of the utility model;

[0018] Figure 2 It is a schematic structural diagram of the dust removal water tank provided by an embodiment of the utility model;

[0019] Figure 3 It is a schematic structural diagram of the dust removal ball plate provided by an embodiment of the utility model.

[0020] Legend Explanation:

[0021] 1 - Extraction rigid air duct; 2 - Extraction fan; 3 - Extraction flexible air duct; 4 - Dust removal water tank; 5 - Dust reduction air duct; 6 - Full-face tunneling machine; 7 - Forced air duct; 8 - Air inlet of the dust removal water tank; 91 - High-pressure water pipe I; 92 - High-pressure water pipe II; 10 - Dust removal ball plate; 101 - Wire mesh; 102 - Dust removal ball; 11 - Air outlet of the dust removal water tank. Detailed Embodiment

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and not to describe a specific order; the orientation or positional relationship indicated by the terms "inside", "outside", "left", "right" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present utility model.

[0023] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of the application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0024] An embodiment of the present utility model provides a dust removal system for a comprehensive tunneling face in a phosphorus mine roadway, as Figures 1 to 3 shown. It includes a dust control system and a dust collection system. The dust control system is arranged on one side of the full-face tunneling machine 6. The dust control system includes a forced draft fan and a forced draft air duct 7 connected in sequence. The forced draft fan is arranged at the external fresh air flow. The air outlet of the forced draft air duct 7 is arranged 0-12 m behind the full-face tunneling machine 6 from the operation platform. The forced draft fan combined with the forced draft air duct 7 is used to press fresh air to the tunneling face to prevent the dust generated during the operation of the tunneling machine from spreading to the rear of the roadway.

[0025] The dust collection system is arranged on the other side of the full-face heading machine 6. The dust collection system includes an extraction fan 2, an extraction air duct, a dust removal water tank 4 and a dust suppression air duct 5. The extraction air duct includes an extraction rigid air duct 1 and an extraction flexible air duct 2. The negative pressure end of the extraction fan 2 is connected to the extraction rigid air duct 1, and the positive pressure end is connected to the extraction flexible air duct 2. The air inlet of the extraction rigid air duct 1 is less than 2 m away from the full-face heading working face of the full-face heading machine 6. The length of the extraction rigid air duct is 18 - 30 m to ensure the dust extraction effect of the extraction fan 2. The other end of the extraction flexible air duct 2 is connected to the air inlet of the dust removal water tank 8, and the air outlet 11 of the dust removal water tank is connected to the dust suppression air duct 5. Preferably, the length of the dust suppression air duct 5 is ≥ 3 m. The dust removal water tank 4 includes a water curtain dust removal part and a packing dust removal part. The water curtain dust removal part includes a high-pressure water pipe I 91 arranged at the top of the dust removal water tank. The packing dust removal part includes a dust removal ball plate 10 arranged inside the dust removal water tank and a high-pressure water pipe II 92 arranged on the side wall of the dust removal water tank. The high-pressure water pipe II 92 is adjacent to the dust removal ball plate 10. The water curtain dust removal part is arranged on the air inlet side of the dust removal water tank, and the packing dust removal part is arranged on the air outlet side of the dust removal water tank. The dust removal ball plate 10 is composed of a wire mesh 101 and dust removal balls 102 fixed inside the wire mesh.

[0026] The working principle of the dust collection system provided in this embodiment is as follows:

[0027] The forced ventilation fan is arranged at the external fresh air flow. The forced ventilation air duct 7 is connected to the forced ventilation fan and the air outlet is arranged 0 - 12 m behind the full-face heading machine 6 to press fresh air to the heading working face.

[0028] The extraction fan 2 is used to extract a large amount of dust from the working face into the dust removal water tank 4. The extraction fan 2 is arranged on the other side of the operating platform behind the full-face heading machine 6, 18 - 30 m away from the heading face. The negative pressure end is connected to the extraction rigid air duct 1, and its air inlet is not more than 2 m away from the heading face; the positive pressure end is connected to the air inlet of the dust removal water tank 4 arranged in the return airway through the extraction flexible air duct 3, and the air outlet 11 of the dust removal water tank is connected to the 3-meter-long dust suppression air duct 5 to achieve further dust suppression.

[0029] After being extracted, the dust on the working surface enters the dust removal water tank through the air inlet 8. It first passes through the high-pressure water mist sprayed by the high-pressure nozzle of the high-pressure water pipe I 91 in the first dust reduction barrier to reduce dust, and then reaches the second dust reduction barrier. The second dust reduction barrier consists of a high-pressure water pipe II 92 and a dust removal ball plate 10. The dust removal balls 102 clamped by the wire 101 in the dust removal ball plate 10 can absorb a large amount of dust and have a highly efficient dust reduction effect. The high-pressure water mist sprayed by the high-pressure nozzles of the two high-pressure water pipes II 92 can not only continuously flush the dust removal balls 102, ensuring the dust absorption effect of the dust removal balls 102, but also play the dust reduction role of the first dust reduction barrier water curtain dust removal. After passing through the two dust reduction systems in the dust removal water tank 4, the working surface dust flows out from the bottom of the dust removal water tank outlet 11 with the water flow. The water mist blown from the dust removal water tank 4 can further reduce the residual dust in the dust reduction air duct 5.

[0030] Effect of use: The average dust concentration at the cutting dust source of the tunnel boring machine is 206.6 mg / m 3 The average dust concentration at the tunnel boring machine operating table is 3.2 mg / m 3 The average dust concentration at 3m behind the dust removal duct (press-in duct and exhaust duct) is 2.4mg / m 3 .

[0031] In summary, the dust removal system provided in this embodiment is simple, efficient, and has a good dust removal effect, ensuring that the comprehensive excavation operation environment meets the requirements.

[0032] The above are merely preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be construed as limiting the present invention. The scope of protection of the present invention shall be determined by the scope defined in the claims. Persons skilled in the art will appreciate that improvements and modifications may be made without departing from the spirit and scope of the present invention, and such improvements and modifications shall also be considered within the scope of protection of the present invention.

Claims

1. A dust removal system for a fully mechanized drivage face of a rock roadway in a phosphate mine, characterized in that: It includes a dust control system arranged on one side of the full-section tunneling machine and a dust collection system on the other side. The dust control system includes a forced draft fan and a forced draft air duct connected in sequence. The dust collection system includes an exhaust fan, an exhaust air duct, a dust removal water tank, and a dust suppression air duct. The exhaust air duct includes a rigid exhaust air duct and a flexible exhaust air duct. The negative pressure end of the exhaust fan is connected to the rigid exhaust air duct, and the positive pressure end is connected to the flexible exhaust air duct. The other end of the flexible exhaust air duct is connected to the air inlet of the dust removal water tank, and the air outlet of the dust removal water tank is connected to the dust suppression air duct. The dust removal water tank includes a water curtain dust removal part and a packing dust removal part. The water curtain dust removal part includes a high-pressure water pipe Ⅰ arranged on the top of the dust removal water tank. The packing dust removal part includes a dust removal ball plate arranged inside the dust removal water tank and a high-pressure water pipe Ⅱ arranged on the side wall of the dust removal water tank. The high-pressure water pipe Ⅱ is adjacent to the dust removal ball plate.

2. The dust removal system for the comprehensive tunneling face of the rock roadway in the phosphorus mine according to claim 1, characterized in that: The air outlet of the forced draft air duct is arranged 0 - 12 m behind the full-section tunneling machine from the operation console.

3. A dust removal system for a comprehensive tunneling face in a phosphorus mine roadway according to claim 1, characterized in that: The distance between the air inlet of the rigid exhaust air duct and the full-section tunneling face is less than 2 m.

4. The dust removal system for the comprehensive tunneling face of the rock roadway in the phosphorus mine according to claim 1, wherein: The length of the rigid exhaust air duct is 18 - 30 m.

5. The dust removal system for the comprehensive tunneling face of the rock roadway in the phosphorus mine according to claim 1, characterized in that: The length of the dust suppression air duct is ≥ 3 m.

6. The dust removal system for the comprehensive driving face of rock roadway in a phosphate mine according to claim 1, wherein: The water curtain dust removal part is arranged on the air inlet side of the dust removal water tank, and the packing dust removal part is arranged on the air outlet side of the dust removal water tank.

7. The dust removal system for the comprehensive tunneling face of the rock roadway in the phosphorus mine according to claim 1, characterized in that: The dust removal ball plate is composed of a wire mesh and dust removal balls fixed inside the wire mesh.

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