A test platform for a respirable dust separator

Abstract

This invention relates to the field of dust separation equipment technology, providing a test platform for a respirable dust separator. It includes: a respirable dust separator; a dust generator connected to the sampling inlet of the respirable dust separator, with at least two gas input interfaces on the outside of the sampling inlet for inputting clean air; a first detection component connected to the main outlet of the respirable dust separator; and a second detection component connected to the secondary outlet of the respirable dust separator. This invention utilizes numerical simulation to investigate the separation characteristics of respirable dust under different sheath flow ratios, secondary flow ratios, and sampling inlet wind speeds. Furthermore, it obtains an optimized separation parameter scheme using response surface methodology, enabling research in the field of respirable dust in coal mines.

Description

Technical Field

[0001] This utility model relates to the technical field of dust separation equipment, specifically a test platform for a respirable dust separator. Background Technology

[0002] Existing sheath-flow virtual impact separators are mainly used for bioaerosol separation and stationary pollution source monitoring, but there is no research specifically for respirable dust in coal mines. To address this technical issue, a test platform for a respirable dust separator is proposed. Utility Model Content

[0003] The purpose of this invention is to provide a test platform for a respirable dust separator to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A test platform for a respirable dust separator, comprising: a respirable dust separator; A dust generator is connected to the sampling inlet of the respirable dust separator. The outside of the sampling inlet is provided with no less than two gas input ports, through which clean air is introduced. The first detection component is connected to the main outlet of the respirable dust separator; And a second detection component connected to the secondary outlet of the respirable dust separator.

[0005] As a further improvement of this utility model: the air input end of the dust generator is connected to the output end of the drying filter, and the drying filter inputs dry air into the dust generator.

[0006] As a further improvement of this utility model, the gas input end is connected to the output end of the micro air pump.

[0007] As a further embodiment of this utility model: the first detection component includes a first flow meter and a first dust sampler, one end of the first flow meter is connected to the main outlet, and the other end of the first flow meter is connected to the input end of the first dust sampler.

[0008] As a further embodiment of this utility model: the second detection component includes a second flow meter and a second dust sampler, one end of the second flow meter is connected to the secondary flow outlet, and the other end of the second flow meter is connected to the input end of the second dust sampler.

[0009] As a further embodiment of this utility model: the respirable dust separator includes a separation chamber and an inner separation chamber. An accelerating flow channel is provided at the top of the separation chamber. The bottom outlet of the accelerating flow channel is installed on a first mounting hole at the top of the separation chamber. The top inlet of the accelerating flow channel is connected to the output end of the sampling inlet. At least two gas input interfaces and the sampling inlet converge to the top inlet of the accelerating flow channel. An inner separation chamber is provided inside the separation chamber. A main flow channel is provided between the inner separation chamber and the top of the separation chamber. Gaps are provided between the perimeter of the inner separation chamber and the side walls of the separation chamber. An inlet is provided at the middle of the top of the inner separation chamber. The top inlet of the inner separation chamber is located directly below the accelerating flow channel, and the bottom of the inner separation chamber is open. A large particle collection chamber is provided at the middle of the interior of the inner separation chamber. The outer diameter of the large particle collection chamber is smaller than the top inlet of the inner separation chamber. The end of the large particle collection chamber furthest from the accelerating flow channel is a secondary flow outlet, and the bottom of the separation chamber is a main flow outlet.

[0010] As a further improvement of this utility model, the large particle collection chamber is composed of a circular tube disposed inside the inner separation chamber.

[0011] As a further improvement of this utility model: the end of the large particle collection chamber passes through the side wall of the separation chamber, and the secondary flow outlet is located outside the separation chamber.

[0012] As a further improvement of this utility model: the acceleration channel is a strip-shaped circular channel, and the cross-sectional area of ​​the acceleration channel is smaller than the sum of the cross-sectional area of ​​the sampling inlet and the cross-sectional areas of multiple gas input interfaces.

[0013] As a further improvement of this utility model: the internal chamber of the separation chamber is cylindrical, and the distance between the upper sidewalls of the inner separation chamber and the sidewalls of the separation chamber gradually decreases from top to bottom.

[0014] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention can use numerical simulation methods to explore the separation law of respirable dust in a separator under different sheath flow ratios, secondary flow ratios, and sampling inlet wind velocities. Furthermore, it obtains an optimized separation parameter scheme through response surface methodology, thus enabling research in the field of respirable dust in coal mines. The research results of this invention can provide a reference for optimizing the performance of respirable dust separators in coal mines, further promoting the development of precise monitoring technology for respirable dust in coal mines. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a test platform for a respirable dust separator according to an embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the structure of a respirable dust separator in a test platform for a respirable dust separator according to an embodiment of this utility model.

[0017] In the diagram: 1-Sampling inlet, 2-Accelerating channel, 3-Main channel, 4-Separation chamber, 5-Inner separation chamber, 6-Secondary outlet, 7-Main outlet, 8-Drying filter, 9-Dust generator, 10-Miniature air pump, 11-First flow meter, 12-First dust sampler, 13-Second flow meter, 14-Second dust sampler, 101-First sheath flow inlet, 102-Second sheath flow inlet, 501-Large particle collection chamber. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Example 1 Please see Figure 1 This utility model provides a structural diagram of a respirable dust separator testing platform according to Embodiment 1. The respirable dust separator testing platform includes: a respirable dust separator, a dust generator 9, a first sampling and detection component, and a second sampling and detection component. The sampling inlet 1 of the respirable dust separator is connected to the output port of the dust generator 9. At least two gas input interfaces are provided on the outside of the sampling inlet 1, through which clean air is input. The main outlet 7 of the respirable dust separator is connected to the first detection component, and the secondary outlet 6 of the respirable dust separator is connected to the second detection component. The air input end of the dust generator 9 is connected to the output end of a dryer filter 8, which inputs dry air into the dust generator 9.

[0020] The gas input terminal is connected to the output terminal of the micro air pump 10 so as to input fresh air.

[0021] When using this respirable dust separator test platform: First, the relevant machines of the respirable dust separation efficiency testing platform were cleaned and preheated. The stability of dust concentration inside the transverse cylindrical pipe and the sealing of each connection were checked. The atmospheric temperature was measured and recorded. The sheath flow virtual impact separator was fixed in the pipe. The main flow outlet and the secondary flow outlet were connected to two dust samplers through hoses. Flow meters were used to control the flow rate of the main flow and the secondary flow. A miniature air pump was used to input clean gas into the sheath flow inlets on both sides. The dried coal powder is poured into the feeding funnel of the dust generator for dust generation, and the sampler is turned on to test the separation efficiency. After the coal powder is separated by the separator, large particles and small respirable particles will be collected by the filter membrane installed on the dust sampler, and the sampling time is 5 minutes. The dust dispersion of the sampled filter membranes was tested using a Malvern 3000 laser particle size analyzer. Each group of filter membranes was tested three times and the arithmetic mean was taken to obtain the volume fraction of dust particles of different sizes, and thus the separation efficiency of the separator for dust particles of different sizes was obtained. After operation, turn on the dust removal device and turn off the dust generation device; when the dust particle concentration inside the air duct reaches 0–2.5 mg / m³ 3 When necessary, turn off the dust removal device.

[0022] This invention addresses the problem of large detection errors and poor separation effects caused by differences in humidity, temperature, and dust properties in underground coal mine environments. A response surface model is established, and through a combination of numerical simulation and experiments, the separation law of respirable dust in the separator under the influence of three factors: different sheath flow ratios, secondary flow ratios, and sampling inlet wind speeds is obtained. An optimized separation parameter scheme is then determined. The research results can provide technical support for the accurate monitoring of respirable dust sensors in coal mines.

[0023] In a preferred embodiment of the present invention, the first detection component includes a first flow meter 11 and a first dust sampler 12. One end of the first flow meter 11 is connected to the main outlet 7, and the other end of the first flow meter 11 is connected to the input end of the first dust sampler 12.

[0024] In a preferred embodiment of the present invention, the second detection component includes a second flow meter 13 and a second dust sampler 14. One end of the second flow meter 13 is connected to the secondary flow outlet 6, and the other end of the second flow meter 13 is connected to the input end of the second dust sampler 14.

[0025] Both the first dust sampler 12 and the second dust sampler 14 can be Malvern 3000 laser particle size analyzers.

[0026] This invention also includes a controller, which is connected to each device to control each device.

[0027] like Figure 2As shown, in a preferred embodiment of this utility model, the respirable dust separator includes: a separation chamber 4 and an inner separation chamber 5. An accelerating flow channel 2 is provided at the top of the separation chamber 4. The bottom outlet of the accelerating flow channel 2 is installed on a first mounting hole at the top of the separation chamber 4. The top inlet of the accelerating flow channel 2 is connected to the output end of the sampling inlet 1. At least two gas input interfaces and the sampling inlet 1 converge to the top inlet of the accelerating flow channel 2. The inner separation chamber 5 is provided inside the separation chamber 4, and a [missing information - likely a type of structure or feature] is provided between the inner separation chamber 5 and the top of the separation chamber 4. The main channel 3 has a gap between the inner separation chamber 5 and the side wall of the separation chamber 4. An inlet is located at the top center of the inner separation chamber 5, directly below the acceleration channel 2. The bottom of the inner separation chamber 5 is open. A large particle collection chamber 501 is located in the middle of the inner separation chamber 5, with an outer diameter smaller than the top inlet. The end of the large particle collection chamber 501 furthest from the acceleration channel 2 is the secondary outlet 6. The bottom of the separation chamber 4 has a main channel outlet 7. The top periphery of the inner separation chamber 5 is lower than the top center. During operation, the sampling inlet 1 receives a sampling airflow at a moving speed, while clean air is simultaneously input through the gas input interfaces on both sides. The clean air enters through the sheath inlets on both sides, enveloping the sampling airflow. The dust-laden gas enters the main channel 3 through the acceleration section, where it splits into multiple airflows. Due to the greater inertia of particles larger than the cutting diameter, they will move in a straight line with the weaker airflow into the large particle collection chamber 501 in the middle, and then exit through the secondary outlet 6. However, small particles smaller than the cutting diameter have less inertia, and their trajectories will be deflected by the viscous force of the airflow. As the airflow enters the main channels on both sides, it is then discharged from the main outlet 7. During this separation process, collisions and rebounds between particles and the wall often occur near the acceleration section and the separation chamber, which can cause unnecessary wall losses and reduce separation performance. However, the clean gas entering from the sheaths on both sides will compress the dust-laden gas near the central axis, minimizing collisions with the wall and particle losses. Furthermore, large dust particles are directly discharged into the atmosphere, eliminating the need for frequent cleaning of the device, thus achieving long-term, efficient, and continuous separation.

[0028] This invention, based on classical virtual impact theory, replaces the impact plate in impact separators with a cavity (i.e., a secondary flow channel), solving problems such as particle breakage and rebound at the impact plane. Addressing the issue of significant particle loss at the wall collision surface, the trajectory of the sampling airflow is controlled by introducing clean airflow at the side end, reducing particle loss at the wall collision surface and thus improving separation performance. Simulation and experimentation are used to explore the main controlling factors affecting the continuous separation of respirable dust, and a virtual impact separator for respirable dust conforming to the BMRC international separation standard curve is developed, achieving continuous and efficient separation of respirable dust and improving the prevention and control level of occupational dust hazards. To address the insufficiently clear description of the influence mechanism of different structural dimensions on the separation law, a two-phase flow numerical model of the "airflow-dust" migration motion inside a sheath-flow respirable dust separator is established. Structural parameters are optimized using simulation software, and the internal flow field characteristics of the model are analyzed to obtain the separation law of respirable dust under different structural parameters, laying the foundation for developing a separator that meets the BMRC international separation standard.

[0029] In a preferred embodiment of the present invention, the large particle collection chamber 501 may be composed of a circular tube disposed inside the inner separation chamber 5.

[0030] In a preferred embodiment of the present invention, the end of the large particle collection chamber 501 passes through the side wall of the separation chamber 4, and the secondary flow outlet 6 is located on the outside of the separation chamber 4.

[0031] In a preferred embodiment of this invention, the accelerating flow channel 2 is a strip-shaped circular channel, and the cross-sectional area of ​​the accelerating flow channel 2 is smaller than the sum of the cross-sectional areas of the sampling inlet 1 and the multiple gas input interfaces. This accelerates the input clean air and sampling airflow.

[0032] In a preferred embodiment of the present invention, the internal chamber of the separation chamber 4 is cylindrical, and the distance between the upper sidewall of the inner separation chamber 5 and the sidewall of the separation chamber 4 gradually decreases from top to bottom.

[0033] In a preferred embodiment of this utility model, the gas input interface can be two, three, or four.

[0034] In a preferred embodiment of the present invention, there are two gas input interfaces. Specifically, the gas input interfaces include a first sheath flow inlet 101 and a second sheath flow inlet 102, which are symmetrically distributed on both sides of the sampling flow inlet 1.

[0035] This invention uses numerical simulation to determine the influence of different sheath flow ratios, secondary flow ratios, and sampling inlet wind velocities on the separation efficiency of a separator for respirable dust. An optimized separation parameter scheme is obtained using response surface methodology, and separation efficiency tests reveal that the maximum error between the experimental and simulation results is only 4.06%. Specific conclusions are as follows: (1) When the sheath flow ratio increases, the separation efficiency of the separator at each particle size point continues to decrease; when the secondary flow ratio increases, the deviation between the separation efficiency curve and the BMRC curve shows a trend of first decreasing and then increasing; when the sampling inlet wind speed increases, the separation efficiency curve shows an overall downward trend.

[0036] (2) By analyzing the response surface model, the influence of each factor on the separation efficiency of the sheath flow respirable dust virtual impact separator is obtained: sheath flow ratio > secondary flow ratio > sampling inlet wind speed.

[0037] (3) A better optimized separation parameter scheme was found: sheath flow ratio of 111.41%, secondary flow ratio of 10.68%, and sampling inlet wind velocity of 3.45 m / s. The separation efficiencies of dust particles with diameters of 2.2 μm, 3.9 μm, 5.0 μm, 5.9 μm, and 7.1 μm were 87.38%, 67.17%, 51.12%, 26.24%, and 4.98%, respectively, which met the separation standards. The research results can provide theoretical guidance for the development of respirable dust monitoring technology in coal mines.

[0038] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0039] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A test platform for a respirable dust separator, characterized in that, include: Respirable dust separator; A dust generator (9) is connected to the sampling inlet (1) of the respirable dust separator. At least two gas input ports are provided on the outside of the sampling inlet (1), and clean air is input through the gas input ports. The first detection component is connected to the main outlet (7) of the respirable dust separator; and a second detection component connected to the secondary outlet (6) of the respirable dust separator.

2. The test platform for a respirable dust separator according to claim 1, characterized in that, The air input end of the dust generator (9) is connected to the output end of the dryer filter (8), and the dryer filter (8) inputs dry air into the dust generator (9).

3. The test platform for a respirable dust separator according to claim 1, characterized in that, The gas input end is connected to the output end of the micro air pump (10).

4. The test platform for a respirable dust separator according to claim 1, characterized in that, The first detection component includes a first flow meter (11) and a first dust sampler (12). One end of the first flow meter (11) is connected to the main outlet (7), and the other end of the first flow meter (11) is connected to the input end of the first dust sampler (12).

5. The test platform for a respirable dust separator according to claim 1, characterized in that, The second detection component includes a second flow meter (13) and a second dust sampler (14). One end of the second flow meter (13) is connected to the secondary flow outlet (6), and the other end of the second flow meter (13) is connected to the input end of the second dust sampler (14).

6. The test platform for a respirable dust separator according to claim 5, characterized in that, The respirable dust separator includes: a separation chamber (4) and an inner separation chamber (5). An accelerating flow channel (2) is provided at the top of the separation chamber (4). The bottom outlet of the accelerating flow channel (2) is installed on the first mounting hole at the top of the separation chamber (4). The top inlet of the accelerating flow channel (2) is connected to the output end of the sampling inlet (1). At least two gas input interfaces and the sampling inlet (1) converge at the top inlet of the accelerating flow channel (2). An inner separation chamber (5) is provided inside the separation chamber (4). A main flow channel (3) is provided between the inner separation chamber (5) and the top of the separation chamber (4). A gap is provided between the separation chamber (5) and the side wall of the separation chamber (4). An inlet is provided at the middle of the top of the inner separation chamber (5). The inlet at the top of the inner separation chamber (5) is located directly below the acceleration channel (2). The bottom of the inner separation chamber (5) is set as an opening. A large particle collection chamber (501) is provided at the middle of the interior of the inner separation chamber (5). The outer diameter of the large particle collection chamber (501) is smaller than the inlet at the top of the inner separation chamber (5). The end of the large particle collection chamber (501) away from the acceleration channel (2) is the secondary flow outlet (6). The bottom of the separation chamber (4) is provided with the main flow outlet (7).

7. The test platform for a respirable dust separator according to claim 6, characterized in that, The large particle collection chamber (501) consists of a circular tube set inside the inner separation chamber (5).

8. The test platform for a respirable dust separator according to claim 7, characterized in that, The end of the large particle collection chamber (501) passes through the side wall of the separation chamber (4), and the secondary flow outlet (6) is located outside the separation chamber (4).

9. The test platform for a respirable dust separator according to claim 6, characterized in that, The acceleration channel (2) is a strip-shaped circular channel. The cross-sectional area of ​​the acceleration channel (2) is smaller than the sum of the cross-sectional area of ​​the sampling inlet (1) and the cross-sectional areas of multiple gas input interfaces.

10. The test platform for a respirable dust separator according to claim 6, characterized in that, The internal chamber of the separation chamber (4) is cylindrical, and the distance between the upper sidewall of the inner separation chamber (5) and the sidewall of the separation chamber (4) gradually decreases from top to bottom.

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