Bulk emulsion explosive conveying pipeline lubricating and resistance reducing method safe to operate

Abstract

The invention discloses a safe-to-operate lubricating and resistance-reducing method for a bulk emulsion explosive conveying pipeline, which comprises the following steps: S1, a lubricating and resistance-reducing device is arranged at the feeding end of the bulk emulsion explosive conveying pipeline, the lubricating and resistance-reducing device comprises an inner ring and an outer ring which are coaxially arranged, and a sealing gap is formed between the inner ring and the outer ring; the surface of the inner ring is provided with a flow dividing groove extending in the axial direction. S2, sensitizing agents are pressurized and injected into the sealing gaps through a high-pressure plunger pump, and the sensitizing agents are evenly distributed through the flow dividing grooves and form a continuous lubricating film on the inner wall of the conveying pipeline; and S3, the emulsion matrix is conveyed to an inner ring channel of the lubricating and resistance reducing device, the emulsion matrix flows along the surface of the lubricating film, and layered conveying of the emulsion matrix and the sensitizer is achieved. The device has the advantages of being remarkable in resistance reduction effect, high in intrinsic safety performance, high in adaptability, stable in blasting quality, high in intelligent degree and the like.

Description

Technical Field

[0001] This invention relates to the field of blasting technology, and in particular to a safe method for lubricating and reducing drag in pipelines for transporting bulk emulsion explosives. Background Technology

[0002] In open-pit mine operations involving the mixing of emulsion explosives, long-distance transport of the latex matrix presents challenges such as high pipeline resistance, high transport pressure, and inherent safety risks. Traditional transport methods involve the latex matrix directly contacting the inner wall of the pipeline, resulting in high frictional resistance that limits transport distance and necessitates frequent relocation of the mixing vehicle, reducing loading efficiency. Furthermore, the pre-mixing of the latex matrix and sensitizer can lead to unexpected sensitization reactions during transport, posing safety hazards. In addition, traditional methods cannot dynamically adjust lubrication and drag reduction based on parameters such as ambient temperature and transport distance, making them unsuitable for the complex operational scenarios of different mines and impacting blasting quality and operational safety.

[0003] While some drag reduction technologies have been attempted in the existing field, they generally suffer from problems such as uneven lubrication film, poor layered delivery effect, and low sensitization efficiency. Furthermore, they lack effective safety monitoring and intelligent control mechanisms, failing to meet the development needs of intelligent and inherently safe on-site mixed explosives delivery vehicles. Therefore, developing a lubrication and drag reduction method for bulk emulsion explosives delivery pipelines that offers good lubrication and drag reduction effects, reliable operation, and strong adaptability is of significant practical importance. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a safe lubrication and drag reduction method for bulk emulsion explosive delivery pipelines.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A method for lubricating and reducing drag in a bulk emulsion explosive delivery pipeline that ensures safe operation includes the following steps: S1: A lubrication and drag reduction device is installed at the feed end of the bulk emulsion explosive conveying pipeline. The lubrication and drag reduction device includes an inner ring and an outer ring arranged coaxially, forming a sealing gap between the inner ring and the outer ring. The inner ring surface is provided with a diversion groove extending along the axial direction. S2: The sensitizer is injected into the sealing gap under pressure by a high-pressure plunger pump. The sensitizer is evenly distributed through the diversion groove and forms a continuous lubricating film on the inner wall of the delivery pipeline. S3: The latex matrix is ​​delivered to the inner ring channel of the lubrication and drag reduction device. The latex matrix flows along the surface of the lubrication film, realizing the layered delivery of the latex matrix and the sensitizer. S4: The latex matrix and sensitizer delivered in layers are fully mixed by a static mixer at the end of the delivery pipeline, and then enter the borehole to complete the rapid sensitization without aftereffects.

[0006] Preferably, in step S1, both the inner ring and the outer ring are made of 304 stainless steel, the width of the sealing gap is 1.8-2.2mm, and the number of the diversion grooves is 4-8, which are evenly distributed along the circumference of the inner ring.

[0007] Preferably, in step S2, the output pressure of the high-pressure plunger pump is 1.0-1.5 MPa, and the ratio of the injection flow rate of the sensitizer to the delivery flow rate of the latex matrix is ​​1:50-80.

[0008] Preferably, in step S2, the thickness of the lubricating film is 0.1-0.3 mm. The flow rate of the sensitizer injection is monitored in real time by a flow sensor, and the output pressure of the high-pressure plunger pump is dynamically adjusted to maintain the stability of the lubricating film thickness.

[0009] Preferably, in step S3, the latex matrix is ​​conveyed by a screw pump, the conveying pressure is controlled at 0.8-1.2 MPa, and the flow rate and pressure parameters of the latex matrix are monitored in real time by an ultrasonic flow meter during the conveying process.

[0010] Preferably, in step S3, the ambient temperature and the latex matrix temperature are monitored by a temperature sensor. When the ambient temperature is below 5°C, the sensitizer is heated to 15-20°C before being injected into the sealing gap. When the ambient temperature is above 35°C, the output pressure of the high-pressure plunger pump is reduced by 0.2-0.3 MPa.

[0011] Preferably, in step S4, the mixing element of the static mixer has a spiral structure, the ratio of the length of the mixing element to the inner diameter of the delivery pipeline is 5-8, and the residence time of the latex matrix and sensitizer in the static mixer is 3-5 seconds.

[0012] Preferably, in step S4, the latex matrix is ​​mixed with the sensitizer and then introduced into the borehole. The sensitization is completed in 15-30 minutes. The detonation velocity of the sensitized emulsion explosive is greater than or equal to 4000 m / s, and the density is 1.05-1.20 g / cm³.

[0013] Preferably, the delivery pipeline is made of polylactic acid composite polymer material, and the delivery pipeline is automatically wound and unwound by a reel, with the winding and unwinding speed of the reel matching the delivery speed of the latex matrix.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, by forming a uniform lubricating film on the inner wall of the conveying pipeline, the conveying resistance of the latex matrix is ​​effectively reduced, the conveying pressure is controlled below 1.2MPa, the conveying distance can reach more than 40 meters, the number of times the mixing vehicle moves is reduced, and the loading efficiency is improved.

[0015] 2. In this invention, a layered delivery method of latex matrix and sensitizer is adopted, which avoids the safety risk of premature sensitization during the delivery process; the sensitized explosive has no detonator sensitivity and is equipped with a complete safety monitoring and alarm mechanism, which greatly improves the safety of operation.

[0016] 3. This invention integrates intelligent temperature control and adjustment functions, which can dynamically adjust operating parameters according to ambient temperature, adapt to operating needs under different temperature conditions (high, medium, and low), and is suitable for complex operating scenarios in various open-pit mines.

[0017] 4. In this invention, by precisely controlling the injection flow rate and mixing effect of the sensitizer, the density, detonation velocity and other parameters of the emulsion explosive are kept stable, thereby achieving precise energy matching between the explosive and the rock, improving the blasting effect and reducing the unit consumption of explosive.

[0018] 5. In this invention, multiple sensors such as flow rate, pressure, and temperature are combined with an intelligent control system to achieve real-time monitoring and dynamic control of the lubrication and drag reduction process, providing data support for refined blasting and meeting the development needs of smart mine construction. Attached Figure Description

[0019] Figure 1 This is a flowchart of a method for lubricating and reducing drag in a bulk emulsion explosive delivery pipeline that is safe to operate, as proposed in this invention. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] Reference Figure 1 A method for lubricating and reducing drag in a bulk emulsion explosive delivery pipeline that ensures safe operation, comprising the following steps: S1: A lubrication and drag reduction device is installed at the feed end of the bulk emulsion explosive conveying pipeline. The lubrication and drag reduction device includes an inner ring and an outer ring arranged coaxially, forming a sealing gap between the inner ring and the outer ring. The inner ring surface is provided with a diversion groove extending along the axial direction. S2: The sensitizer is injected into the sealing gap under pressure by a high-pressure plunger pump. The sensitizer is evenly distributed through the diversion groove and forms a continuous lubricating film on the inner wall of the delivery pipeline. S3: The latex matrix is ​​delivered to the inner ring channel of the lubrication and drag reduction device. The latex matrix flows along the surface of the lubrication film, realizing the layered delivery of the latex matrix and the sensitizer. S4: The latex matrix and sensitizer delivered in layers are fully mixed by a static mixer at the end of the delivery pipeline, and then enter the borehole to complete the rapid sensitization without aftereffects.

[0022] In step S1, both the inner and outer rings are made of 304 stainless steel, the width of the sealing gap is 1.8-2.2mm, and the number of diversion grooves is 4-8, which are evenly distributed along the circumference of the inner ring.

[0023] In step S2, the output pressure of the high-pressure plunger pump is 1.0-1.5MPa, and the ratio of the injection flow rate of the sensitizer to the delivery flow rate of the latex matrix is ​​1:50-80.

[0024] In step S2, the thickness of the lubricating film is 0.1-0.3 mm. The flow rate of the sensitizer injection is monitored in real time by a flow sensor, and the output pressure of the high-pressure plunger pump is dynamically adjusted to maintain the stability of the lubricating film thickness.

[0025] In step S3, the latex matrix is ​​conveyed by a screw pump, and the conveying pressure is controlled at 0.8-1.2MPa. During the conveying process, the flow rate and pressure parameters of the latex matrix are monitored in real time by an ultrasonic flow meter.

[0026] In step S3, the ambient temperature and latex matrix temperature are monitored by a temperature sensor. When the ambient temperature is below 5°C, the sensitizer is heated to 15-20°C before being injected into the sealing gap. When the ambient temperature is above 35°C, the output pressure of the high-pressure plunger pump is reduced by 0.2-0.3 MPa.

[0027] In step S4, the mixing element of the static mixer has a spiral structure, the ratio of the length of the mixing element to the inner diameter of the delivery pipeline is 5-8, and the residence time of the latex matrix and sensitizer in the static mixer is 3-5 seconds.

[0028] In step S4, the latex matrix and sensitizer are mixed and then introduced into the borehole. The sensitization process takes 15-30 minutes. After sensitization, the detonation velocity of the emulsion explosive is greater than or equal to 4000 m / s and the density is 1.05-1.20 g / cm³.

[0029] The delivery pipeline is made of polylactic acid composite polymer material. The delivery pipeline is automatically wound and unwound by a fully automatic drum. The winding and unwinding speed of the drum is synchronized with the delivery speed of the latex matrix.

[0030] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for lubricating and reducing drag in a pipeline for transporting bulk emulsion explosives with safe operation, characterized in that, Includes the following steps: S1: A lubrication and drag reduction device is installed at the feed end of the bulk emulsion explosive conveying pipeline. The lubrication and drag reduction device includes an inner ring and an outer ring arranged coaxially, forming a sealing gap between the inner ring and the outer ring. The inner ring surface is provided with a diversion groove extending along the axial direction. S2: The sensitizer is injected into the sealing gap under pressure by a high-pressure plunger pump. The sensitizer is evenly distributed through the diversion groove and forms a continuous lubricating film on the inner wall of the delivery pipeline. S3: The latex matrix is ​​delivered to the inner ring channel of the lubrication and drag reduction device. The latex matrix flows along the surface of the lubrication film, realizing the layered delivery of the latex matrix and the sensitizer. S4: The latex matrix and sensitizer delivered in layers are fully mixed by a static mixer at the end of the delivery pipeline, and then enter the borehole to complete the rapid sensitization without aftereffects.

2. The method for lubricating and reducing drag in a bulk emulsion explosive conveying pipeline with safe operation according to claim 1, characterized in that, In step S1, both the inner and outer rings are made of 304 stainless steel, the width of the sealing gap is 1.8-2.2mm, and the number of diversion grooves is 4-8, which are evenly distributed along the circumference of the inner ring.

3. The method for lubricating and reducing drag in a bulk emulsion explosive conveying pipeline with safe operation according to claim 1, characterized in that, In step S2, the output pressure of the high-pressure plunger pump is 1.0-1.5 MPa, and the ratio of the injection flow rate of the sensitizer to the delivery flow rate of the latex matrix is ​​1:50-80.

4. The method for lubricating and reducing drag in a bulk emulsion explosive conveying pipeline with safe operation according to claim 1, characterized in that, In step S2, the thickness of the lubricating film is 0.1-0.3 mm. The flow rate of the sensitizer injection is monitored in real time by a flow sensor, and the output pressure of the high-pressure plunger pump is dynamically adjusted to maintain the stability of the lubricating film thickness.

5. The method for lubricating and reducing drag in a bulk emulsion explosive conveying pipeline with safe operation according to claim 1, characterized in that, In step S3, the latex matrix is ​​conveyed by a screw pump, and the conveying pressure is controlled at 0.8-1.2 MPa. During the conveying process, the flow rate and pressure parameters of the latex matrix are monitored in real time by an ultrasonic flow meter.

6. The method for lubricating and reducing drag in a bulk emulsion explosive conveying pipeline with safe operation according to claim 1, characterized in that, In step S3, the ambient temperature and latex matrix temperature are monitored by a temperature sensor. When the ambient temperature is below 5°C, the sensitizer is heated to 15-20°C before being injected into the sealing gap. When the ambient temperature is above 35°C, the output pressure of the high-pressure plunger pump is reduced by 0.2-0.3 MPa.

7. The method for lubricating and reducing drag in a bulk emulsion explosive conveying pipeline with safe operation according to claim 1, characterized in that, In step S4, the mixing element of the static mixer has a spiral structure, the ratio of the length of the mixing element to the inner diameter of the delivery pipeline is 5-8, and the residence time of the latex matrix and sensitizer in the static mixer is 3-5 seconds.

8. A method for lubricating and reducing drag in a bulk emulsion explosive conveying pipeline with safe operation, as described in claim 1, characterized in that, In step S4, the latex matrix is ​​mixed with the sensitizer and then introduced into the borehole. The sensitization process takes 15-30 minutes. After sensitization, the detonation velocity of the emulsion explosive is greater than or equal to 4000 m / s, and the density is 1.05-1.20 g / cm³.

9. A method for lubricating and reducing drag in a bulk emulsion explosive conveying pipeline with safe operation, as described in claim 1, characterized in that, The delivery pipeline is made of polylactic acid composite polymer material. The delivery pipeline is automatically wound and unwound by a reel, and the winding and unwinding speed of the reel is synchronously matched with the delivery speed of the latex matrix.

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