Spark arrester capture efficiency test device for mining diesel engines

Abstract

The present invention proposes a mining diesel engine spark arrester capture efficiency test device, including: a blast mechanism, a particle injection mechanism, a capture efficiency test mechanism and a test control mechanism; a set pressure air volume is generated by the blast mechanism, particles are injected by the particle injection mechanism, the set pressure air volume and the injected particles are mixed in the main pipeline, and are used to simulate the combustion exhaust gas of the mining diesel engine, and the particles are captured by the spark arrester of the capture efficiency test mechanism, and the capture efficiency is determined by detection and calculation by a gas flow monitoring device. The present invention has a simple structure, high safety, high control accuracy, and accurate capture efficiency, and can ensure the smooth implementation of the national standard GB 20800.3-2008 "General Principles of Explosion-proof Technology for Reciprocating Internal Combustion Engines in Explosive Environments Part 3: Class I Internal Combustion Engines for Underground Mining Areas with Methane and (or) Combustible Dust".

Description

Technical Field

[0001] The invention relates to the technical field of equipment detection, and in particular to a spark arrester capture efficiency testing device for a mining diesel engine. Background Art

[0002] The explosion-proof diesel engine for mining has the advantages of low cost, sufficient power, and long cruising range. It is currently the main power of rubber-wheeled transport vehicles. More than 90% of domestic underground mining rubber-wheeled transport vehicles use explosion-proof diesel engines for mining as power. Therefore, the safety performance of explosion-proof diesel engines is particularly important. At present, domestic explosion-proof diesel engines are designed, manufactured and matched on the basis of ordinary ground diesel engines, and automatic protection devices are added to the main engine, intake system, exhaust system and peripheral devices. Its working process and principle are as follows: the intake air flow passes through the air filter, the choke mechanism, and the intake fence and then enters the main engine system that meets the explosion-proof requirements. The exhaust gas after combustion is cooled, washed and flame-extinguished through the intake and exhaust manifold, exhaust elbow, exhaust bellows and exhaust gas treatment box, and finally discharged into the atmosphere. This method is not enough to ensure the safety of explosion-proof diesel engines. The foreign standard AS / NZS 3584.2:2008 "Diesel engine systems for underground coalmines" Part 2: Explosion protected clearly states that explosion-proof diesel engines need to be equipped with spark arresters after the exhaust flame arrester to further ensure their safety. The national standard GB 20800.3-2008 "General Regulations for Explosion-proof Technology of Reciprocating Internal Combustion Engines for Explosive Atmospheres Part 3: Class I Internal Combustion Engines for Underground Mine Tunnelings with Methane and (or) Combustible Dust" also clearly stipulates the inspection method for spark arresters of internal combustion engines for underground mines. At present, there are ground vehicle spark arrester test platforms for hazardous locations and marine spark arrester test platforms in China, but there is no safety performance verification platform for spark arresters of mining diesel engines that can verify the safety performance of spark arresters of mining diesel engines. Summary of the invention

[0003] The invention provides a spark arrester capture efficiency testing device for a mining diesel engine, aiming to fill the gap in the safety performance verification of the spark arrester for a domestic mining diesel engine, and ensure the smooth implementation of the national standard GB 20800.3-2008 "General Explosion-proof Technical Rules for Reciprocating Internal Combustion Engines for Explosive Environments Part 3: Class I Internal Combustion Engines for Underground Mine Lanes with Methane and (or) Combustible Dust".

[0004] To this end, the purpose of the present invention is to provide a mining diesel engine spark arrester capture efficiency test device, comprising: a blast mechanism, a particle injection mechanism, a capture efficiency test mechanism and a test control mechanism;

[0005] The air blowing mechanism is arranged at the head end of a main pipeline, and is used to generate a set pressure air volume in the main pipeline to simulate the exhaust pipe of a mining diesel engine;

[0006] The particle injection mechanism is connected to the middle of the main pipeline and is used to inject particles into the main pipeline to simulate the particulate matter discharged by the mining diesel engine;

[0007] The collection efficiency test mechanism is a spark extinguisher installed at the end of the main duct, which is used to collect the sprayed particles in the set pressure air volume flowing along the main duct. The collection efficiency of the spark extinguisher is determined by calculating the weight ratio of the sprayed particles captured by the spark extinguisher to the sprayed particles ejected by the particle injection mechanism.

[0008] The test control mechanism is connected to the air blowing mechanism and the particle spraying mechanism respectively, and controls the wind force of the air blowing mechanism and the spraying speed and quality of the particles sprayed by the particle spraying mechanism respectively.

[0009] The blowing mechanism is used to generate a set pressure air volume, the blowing mechanism exhaust port is connected to the head end of the main pipeline, and a manual valve is arranged at the connection point.

[0010] Among them, the particle injection mechanism includes a feed cylinder, a turntable, a vacuum generator, an air compressor and a servo motor;

[0011] The bottom of the central axis of the turntable is connected to a servo motor so that the servo motor controls the rotation around the central axis; a circular groove is arranged on the surface of the turntable to form a material trough, and the feed barrel faces the material trough;

[0012] The vacuum generator and the air compressor are connected through a pipeline; the vacuum generator is arranged opposite to the material trough, and the spray particles in the feed barrel fall into the material trough and rotate with the turntable until they are aligned with the vacuum generator. The vacuum generator works to make the spray particles enter the connecting pipeline between the air compressor and the vacuum generator; the air compressor works to make the spray particles move along the pipeline, and the end of the pipeline is connected to the main pipeline to make the spray particles enter the main pipeline.

[0013] The feed barrel is controlled by a lifting device; the lifting device controls the feed barrel to move closer to or farther from the turntable; the lifting device is fixed by a fixed bracket; and the turntable is also fixed on the fixed bracket.

[0014] Among them, on the pipeline connecting the vacuum generator and the air compressor, a ball valve, a pressure regulating valve and a pressure gauge are arranged in sequence between the air compressor and the vacuum generator; the ball valve is used to cut off the air source of the air compressor; the pressure regulating valve is used to control the pressure in the pipeline; and the pressure gauge is used to display the real-time pressure in the pipeline.

[0015] Wherein, a gas mixing device is arranged on the main pipeline at a position connecting the particle injection mechanism and the capture efficiency test mechanism to convert the gas mixed with the air and the injected particles from a laminar flow state to a uniformly mixed flocculation state.

[0016] Wherein, the gas mixing device is a Venturi tube.

[0017] Among them, the capture efficiency testing mechanism includes a spark extinguisher and a bag dust collector; wherein, the spark extinguisher is arranged at the end of the main pipeline; and the bag dust collector is placed on the outside of the spark extinguisher.

[0018] Among them, the capture efficiency testing mechanism also includes a gas flow monitoring device, which is arranged at a designated position close to the spark extinguisher. The gas flow device is a Pitot tube flowmeter, which measures the gas flow in the pipeline by calculating the pressure difference of the pipe diameter.

[0019] Among them, the test control mechanism is a PLC system, which controls the air volume of the blowing mechanism and the servo motor of the particle injection mechanism through the PLC system, and at the same time receives the analog signal generated by the Pitot tube flowmeter of the gas flow monitoring device to measure the spark extinguisher outlet flow in real time.

[0020] Different from the prior art, the mining diesel engine spark arrester capture efficiency test device provided by the present invention includes: an air blowing mechanism, a particle injection mechanism, a capture efficiency test mechanism and a test control mechanism; the air blowing mechanism generates a set pressure air volume, the particle injection mechanism injects particles, the set pressure air volume and the injected particles are mixed in the main pipeline, and are used to simulate the combustion exhaust gas of the mining diesel engine, and the spark arrester of the capture efficiency test mechanism is used to capture particles, and the gas flow monitoring device is used to detect and calculate to determine the capture efficiency. The present invention has a simple structure, high safety, high control accuracy, and accurate capture efficiency, and can ensure the smooth implementation of the national standard GB 20800.3-2008 "General Principles of Explosion-proof Technology for Reciprocating Internal Combustion Engines in Explosive Environments Part 3: Class I Internal Combustion Engines for Underground Mining Tunnel with Methane and (or) Combustible Dust". BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention and / or additional aspects and advantages will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0022] Figure 1 The present invention is a schematic structural diagram of a spark arrester capture efficiency testing device for a mining diesel engine.

[0023] Figure 2 The present invention is a schematic diagram of the exploded structure of a device for testing the spark arrester capture efficiency of a mining diesel engine.

[0024] Figure 3 The present invention is a schematic structural diagram of a particle injection mechanism in a spark arrester capture efficiency test device for a mining diesel engine. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0026] Figure 1 The present invention provides a mining diesel engine spark arrester capture efficiency test device, which includes: an air blowing mechanism 100, a particle injection mechanism 200, a capture efficiency test mechanism 300 and a test control mechanism 400;

[0027] The air blowing mechanism 100 is disposed at the head end of a main pipeline 18 and is used to generate a set pressure air volume in the main pipeline 18 to simulate the exhaust pipe of a mining diesel engine;

[0028] The particle injection mechanism 200 is connected to the middle of the main pipeline 18 and is used to inject particles into the main pipeline 18 to simulate the particulate matter discharged by the mining diesel engine;

[0029] The collection efficiency test mechanism 300 is a spark extinguisher 6 disposed at the end of the main duct 18, and is used to collect the sprayed particles in the set pressure air volume flowing along the main duct 18. The collection efficiency of the spark extinguisher is determined by calculating the weight ratio of the sprayed particles collected by the spark extinguisher 6 to the sprayed particles ejected by the particle ejection mechanism 200;

[0030] The test control mechanism 400 is connected to the air blowing mechanism 100 and the particle spraying mechanism 200 respectively, and controls the wind force of the air blowing mechanism 100 and the spraying speed and quality of the particles sprayed by the particle spraying mechanism 200 respectively.

[0031] Specific structure such as Figure 2 As shown, the blowing mechanism 100 is a fan for generating a set pressure air volume. The exhaust port of the blowing mechanism 1 is connected to the head end of the main pipeline 18, and a manual valve 2 is provided at the connection point. The manual valve 2 is used to cut off the air source of the air compressor 14.

[0032] The particle injection mechanism 200 has a structure as follows: Figure 3 As shown, it includes a lifting device 10, a feeding cylinder 11, a vacuum generator 12, a turntable 13, an air compressor 14, a ball valve 15, a pressure regulating valve 16, a pressure gauge 17 and a servo motor 21;

[0033] The bottom of the central axis of the turntable 13 is connected to a servo motor 21, so that the servo motor 21 controls the rotation around the central axis; a circular groove is provided on the surface of the turntable 13 to form a material trough 20, and the feed barrel 11 is directly opposite to the material trough 20;

[0034] The vacuum generator 12 and the air compressor 14 are connected by a pipeline; the vacuum generator 12 is arranged opposite to the material trough 20, and the sprayed particles in the feed barrel 11 fall into the material trough 20, and rotate with the turntable 13 until it is aligned with the vacuum generator 12. The vacuum generator 12 works to make the sprayed particles enter the connecting pipeline between the air compressor 14 and the vacuum generator 12; the air compressor 14 works to make the sprayed particles move along the pipeline, and the end of the pipeline is connected to the main pipeline 18, so that the sprayed particles enter the main pipeline 18.

[0035] The feed barrel 11 is controlled by a lifting device 10; the lifting device 10 controls the feed barrel 11 to move closer to or farther from the turntable 13; the lifting device 10 is fixed by a fixed bracket 22; and the turntable 13 is also fixed on the fixed bracket 22. The lifting device 10 is a conventional position movement control device, which is controlled by its own motor and drives the feed barrel 11 to move up and down according to program setting rules. The feed barrel 11 is cylindrical, with the top end fixedly connected to the lifting device 10, the bottom end is closed, and an opening is set. The diameter of the opening is larger than the diameter of the sprayed particles, and the opening position is directly opposite to the material trough 20 set on the turntable 13. Figure 3 As shown, the lifting device 10 , the turntable 13 , the servo motor 21 , and the vacuum generator 12 are all fixed by a fixing bracket 22 .

[0036] Among them, on the pipeline connecting the vacuum generator 12 and the air compressor 14, a ball valve 15, a pressure regulating valve 16 and a pressure gauge 17 are sequentially arranged between the air compressor 14 and the vacuum generator 12; the ball valve 15 is used to control the start of the air compressor 14; the pressure regulating valve 16 is used to control the pressure in the pipeline; the pressure gauge 17 is used to display the real-time pressure in the pipeline. Among them, the air compressor 14, the ball valve 15, the pressure regulating valve 16 and the pressure gauge 17 are all arranged outside the main pipeline 18 and supported by the outer surface of the main pipeline 18.

[0037] The main pipeline 18 is a pipeline formed by connecting one or more sections. If it is formed by connecting multiple sections of pipelines, the flange 19 is used to seal the connection at the location where the multiple sections of pipelines are connected.

[0038] A gas mixing device 4 is provided on the main pipeline 18 at a position connecting the particle injection mechanism 200 and the capture efficiency test mechanism 300 to convert the gas mixed with the air and the injected particles from a laminar flow state to a uniformly mixed flocculation state.

[0039] The gas mixing device 4 is a venturi tube.

[0040] The collection efficiency testing mechanism 300 includes a spark extinguisher 6 and a bag dust collector 7 ; the spark extinguisher 6 is arranged at the end of the main pipeline 18 ; and the bag dust collector 7 is sleeved on the outside of the spark extinguisher 6 .

[0041] The capture efficiency testing mechanism 300 further includes a gas flow monitoring device 5, which is disposed at a designated position close to the spark extinguisher 6. The gas flow device 5 is a Pitot tube flowmeter, which measures the gas flow in the pipeline by calculating the pressure difference of the pipe diameter.

[0042] Among them, the test control mechanism 400 is a PLC system 9, which controls the wind force of the air blowing mechanism and the servo motor 21 of the particle injection mechanism through the PLC system 9, and receives the analog signal generated by the pitot tube flowmeter of the gas flow monitoring device 5, and measures the outlet flow of the spark extinguisher 6 in real time. In the present invention, the PLC system 9 is pre-burned with a program, and by executing the program, it can control the frequency converter 8 to adjust the wind speed of the air blowing mechanism 1, adjust the speed of the servo motor 21 in the particle injection mechanism 200, and receive the analog signal transmitted by the pitot tube flowmeter of the gas flow device 5, and obtain the outlet flow of the spark extinguisher 6 through signal recognition and calculation.

[0043] The present invention uses a blower mechanism 1 to simulate the exhaust pipe of a mining diesel engine, and uses non-combustible particles with specifications of 0.1mm, 0.2mm, and 0.5mm as simulated injection particles, which are blown into the wind flow blown out of the blower mechanism 1 through a particle injection mechanism 200 to simulate the particulate matter discharged during the working process of the mining diesel engine. The fan flow of the blower mechanism 1 is monitored by a pitot tube flowmeter of a gas flow device 5, and its flow and particle injection rate are fed back through a PLC system 9, and then the blower mechanism 1 and the servo motor 21 speed are controlled and adjusted to ensure that their flow is in the middle of the normal exhaust flow range of the simulated mining diesel engine. In other embodiments of the present invention, the PLC system 9 controls the wind force of the blower mechanism 1 through a frequency converter 8.

[0044] The particle injection mechanism 200 is used to spray the particles into the air flow blown out by the blowing mechanism 1, and the particles are sent into the material trough 20 of the turntable 13 through the feeding cylinder 11. The vacuum generator 12 will form a negative pressure at its suction hopper to suck the particles in the material trough below the suction hopper into the pipeline. Finally, the air flow blown out by the air compressor 14 will spray the particles into the main pipeline 18. The rotation speed of the turntable 13 is controlled by the servo motor 21, thereby controlling the injection rate of the particles in the blown air flow.

[0045] During the test, taking an explosion-proof diesel engine with an exhaust flow rate of 600kg / h at rated power as an example, the air flow rate of the main pipeline is set to the middle value of 300kg / h of the exhaust flow rate at rated power in the PLC control system 9, and the running time is 1min. The wind speed of the blowing mechanism 1 can be controlled by the frequency converter 8, and the flow rate is measured by the gas flow device 5 as feedback adjustment to form a closed-loop control of the flow rate and the blowing mechanism. The PID module in the PLC control system 9 is used for automatic adjustment until the air flow rate in the pipeline is 300kg / h. The standard requires that the mass ratio of the injected particles to the air is 1 / 100. The PLC control system 9 will automatically calculate the rate of injected particles to be 0.84g / s, and the particle injection rate is adjusted to 0.84g / s by controlling the rotation speed of the turntable 13 by controlling the servo motor 21. A bag filter 7 is installed at the outlet of the spark extinguisher 6 to collect particles not captured by the spark extinguisher 6, and then the particles captured by the spark extinguisher 6 are calculated after weighing and peeling. The capture efficiency is calculated by the mass ratio of the particles captured by the spark extinguisher 6 to the injected particles.

[0046] Different from the prior art, the mining diesel engine spark arrester capture efficiency test device provided by the present invention includes: an air blowing mechanism, a particle injection mechanism, a capture efficiency test mechanism and a test control mechanism; the air blowing mechanism generates a set pressure air volume, the particle injection mechanism injects particles, the set pressure air volume and the injected particles are mixed in the main pipeline, and are used to simulate the combustion exhaust gas of the mining diesel engine, and the spark arrester of the capture efficiency test mechanism is used to capture particles, and the gas flow monitoring device is used to detect and calculate to determine the capture efficiency. The present invention has a simple structure, high safety, high control accuracy, and accurate capture efficiency, and can ensure the smooth implementation of the national standard GB 20800.3-2008 "General Principles of Explosion-proof Technology for Reciprocating Internal Combustion Engines in Explosive Environments Part 3: Class I Internal Combustion Engines for Underground Mining Tunnel with Methane and (or) Combustible Dust".

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0048] In addition, the terms "first" and "second" (no second is mentioned above) are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0049] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

[0050] Although the embodiments of the present invention have been shown and described above, it is understood that the embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the embodiments within the scope of the present invention.

Claims

1. A spark arrester capture efficiency test device for a mining diesel engine, characterized in that: include: Blowing mechanism, particle injection mechanism, collection efficiency testing mechanism and test control mechanism; Wherein, the blowing mechanism is arranged at the head end of a main pipeline, and is used to generate a set pressure air volume in the main pipeline to simulate the exhaust pipe of a mining diesel engine; The particle injection mechanism is connected to the middle of the main pipeline and is used to inject particles into the main pipeline to simulate the particulate matter discharged by the mining diesel engine; The capture efficiency testing mechanism is a spark extinguisher disposed at the end of the main duct, which is used to collect the sprayed particles in the set pressure air volume flowing along the main duct, and the capture efficiency of the spark extinguisher is determined by calculating the weight ratio of the sprayed particles captured by the spark extinguisher to the sprayed particles ejected by the particle ejection mechanism; The test control mechanism is connected to the air blowing mechanism and the particle spraying mechanism respectively, and controls the pressure and air volume of the air blowing mechanism, and the spraying speed and quality of the particles sprayed by the particle spraying mechanism respectively; The particle injection mechanism includes a feed cylinder, a turntable, a vacuum generator, an air compressor and a servo motor; The bottom of the central axis of the turntable is connected to a servo motor so that the servo motor can control the rotation around the central axis; a circular groove is arranged on the surface of the turntable to form a material trough, and the feed barrel faces the material trough; The vacuum generator and the air compressor are connected through a pipeline; the vacuum generator is arranged opposite to the material trough, and the spray particles in the feed barrel fall into the material trough and rotate with the turntable until they are aligned with the vacuum generator. The vacuum generator works to make the spray particles enter the connecting pipeline between the air compressor and the vacuum generator; the air compressor works to make the spray particles move along the pipeline, and the end of the pipeline is connected to the main pipeline so that the spray particles enter the main pipeline.

2. The spark arrester capture efficiency testing device for a mining diesel engine according to claim 1, characterized in that: The air blowing mechanism is used to generate a set pressure air volume, the air outlet of the air blowing mechanism is connected to the head end of the main pipeline, and a manual valve is arranged at the connection point.

3. The spark arrester capture efficiency testing device for a mining diesel engine according to claim 1, characterized in that: The feed barrel is controlled by a lifting device; the lifting device controls the feed barrel to approach or move away from the turntable; the lifting device is fixed by a fixed bracket; and the turntable is also fixed on the fixed bracket.

4. The spark arrester capture efficiency testing device for a mining diesel engine according to claim 1, characterized in that: On the pipeline connecting the vacuum generator and the air compressor, a ball valve, a pressure regulating valve and a pressure gauge are arranged in sequence between the air compressor and the vacuum generator; the ball valve is used to control the start of the air compressor; the pressure regulating valve is used to control the pressure in the pipeline; and the pressure gauge is used to display the real-time pressure in the pipeline.

5. The spark arrester capture efficiency testing device for a mining diesel engine according to claim 1, characterized in that: A gas mixing device is arranged on the main pipeline at a position connecting the particle injection mechanism and the capture efficiency test mechanism to convert the gas mixed with the air and the injected particles from a laminar flow state to a uniformly mixed flocculation state.

6. The spark arrester capture efficiency testing device for a mining diesel engine according to claim 5, characterized in that: The gas mixing device is a venturi tube.

7. The spark arrester capture efficiency testing device for a mining diesel engine according to claim 1, characterized in that: The capture efficiency testing mechanism includes a spark extinguisher and a bag dust collector; wherein the spark extinguisher is arranged at the end of the main pipeline; and the bag dust collector is placed on the outside of the spark extinguisher.

8. The spark arrester capture efficiency testing device for a mining diesel engine according to claim 7, characterized in that: The capture efficiency testing mechanism also includes a gas flow monitoring device, which is arranged at a designated position close to the spark extinguisher. The gas flow monitoring device is a Pitot tube flowmeter, which measures the gas flow in the pipeline by calculating the pressure difference of the pipe diameter.

9. The spark arrester capture efficiency testing device for a mining diesel engine according to claim 8, characterized in that: The test control mechanism is a PLC system, which controls the pressure and air volume of the blowing mechanism and the servo motor of the particle injection mechanism, and simultaneously receives the analog signal generated by the Pitot tube flowmeter to measure the spark extinguisher outlet flow in real time.

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