Test system and method for noise propagation characteristics of mine wet dust collector

Abstract

The application discloses a kind of mine wet dust collector noise propagation characteristic test system and method.System includes independent dust generator and in turn cascaded standard air duct, filter section, fan, dehydration section, replaceable cross-section sound attenuation section, and sound pressure sensor array and data acquisition unit.Dust generator injects 0-150 μm dust to standard air duct, simulates mine dust environment;Standard air duct is equipped with air valve and micro pressure gauge, and controls air volume and pressure;Filter section contains spray device, dehydration section removes moisture, and sound attenuation section module tests sound wave propagation.Sound pressure sensor array collects sound wave intensity, frequency data, and data acquisition unit analyzes attenuation law.Test method optimizes sound attenuator design by working condition setting, data acquisition and analysis.The application is modularized in structure, accurate in data, suitable for mine noise control research, and has wide applicability.

Description

Technical Field

[0001] This invention relates to the field of mining dust removal equipment technology, specifically to a test system and method for the noise propagation characteristics of a mining wet dust collector. Background Technology

[0002] Mining wet scrubbers are indispensable equipment in underground coal mine ventilation systems, used to capture dust, purify air, and protect miners' health and production safety. However, the high-intensity noise (90-110 dB(A)) generated during their operation far exceeds the national occupational health standard (≤85 dB(A)), becoming a major source of noise pollution in mines. The noise mainly consists of aerodynamic noise caused by the high-speed rotation of the fan blades, airflow turbulence noise during dust removal, and pipeline vibration radiation noise. When these noises propagate within the confined space inside the scrubber, complex physical phenomena such as reflection, refraction, diffraction, and superposition result in a non-uniform distribution of sound pressure levels at different locations. Local sound pressure peaks may form, particularly at the air outlet, severely impacting the working environment and equipment performance.

[0003] Currently, the most effective measure for noise control in mine wet dust collectors is to install silencers at the air outlet, typically employing impedance-type or microporous structures to attenuate sound waves through the interaction between sound waves and materials. However, existing silencer designs often rely on empirical formulas or general models, neglecting the unique operating conditions of mine dust collectors, such as high airflow (350-550 m³ / h). 3 Factors such as airflow velocity ( / min), pulsating airflow, complex pipe geometry (rectangular or circular cross-section), and dust interference make it difficult to predict the propagation characteristics of sound waves within the silencing section. For example, in rectangular pipes, sound waves easily form standing waves or tangential modes, amplifying local sound pressure. Within silencing sections of varying lengths (1-5m), low-frequency noise (<500Hz) is insufficiently attenuated, while high-frequency noise (>2000Hz) is amplified by wind speed. Furthermore, the high dust concentration (5-50μm particle size) in the mine environment interferes with airflow and sound wave propagation; traditional experimental systems lack independent dust simulation devices and cannot realistically reproduce this effect.

[0004] Existing noise propagation testing systems have significant limitations. First, while traditional wind tunnel testing platforms can simulate airflow, they lack integrated dust generation devices, making it difficult to reflect the scattering and attenuation effects of mineral dust on sound wave propagation. Second, sensor placement is limited, typically measuring only at the air outlet or a single cross-section, making it difficult to capture the multi-point sound field distribution within the silencing section, resulting in data lacking spatial representativeness. Third, standard wind tunnels lack sufficient airflow control and pressure monitoring capabilities; existing systems often lack regulating valves and micro-manometers, making precise control of airflow (350-550 m³ / h) impossible. 3Pressure fluctuations (±10 Pa) affect test repeatability. Furthermore, wet scrubbers involve water mist spraying, and humidity significantly impacts sound wave scattering and absorption; however, existing dry scrubber models cannot simulate this effect, limiting the optimal design of wet scrubbers. Literature shows that airflow-sound coupling at high wind speeds (>15 m / s) can reduce attenuation efficiency by more than 30%, and the synergistic effect of dust and humidity further complicates the sound field characteristics. Current technologies lack systematic research methods to quantify these effects. Summary of the Invention

[0005] In view of this, the purpose of this invention is to solve the problem of lack of targeted data for silencer design, and to provide a test system and method for the noise propagation characteristics of a wet dust collector for mining. The system uses an independent dust generator and a series of standard air ducts, filter sections, fans, and silencer modules with different cross-sectional shapes, combined with a sound pressure sensor array and a data acquisition unit, to accurately simulate the sound wave propagation environment under mining conditions and optimize the silencer design.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A noise propagation characteristic test system for a wet dust collector used in mining includes a dust generator and a standard air duct, a filter section, a fan, a dehydration section, a silencer section connected in series, as well as a sound pressure sensor array and a data acquisition unit.

[0008] The dust generator is used to inject dust into a standard air duct to simulate a mine dust environment. The standard air duct is equipped with an air regulating valve and a micro-manometer to regulate the airflow volume and monitor the airflow pressure. The filtration section is used to capture dust. The fan drives the airflow through the system. The dehydration section removes moisture. The silencing section is used for noise reduction. The sound pressure sensor array is detachably arranged at multiple cross-sectional positions inside the silencing section to collect sound wave intensity, frequency, and phase data in real time. The data acquisition unit is electrically connected to the sound pressure sensor array to synchronously process and store the collected data to analyze the propagation and attenuation characteristics of sound waves in the silencing section.

[0009] Furthermore, the silencing section includes multiple interchangeable silencing modules, each with a different cross-sectional shape, including a rectangular cross-section and a circular cross-section. The rectangular cross-section is used to simulate the propagation characteristics of a rectangular pipe, and the circular cross-section is used to simulate the propagation characteristics of a circular pipe, in order to test the differences in sound wave reflection and superposition effects.

[0010] Furthermore, the length of the silencing section is 1m to 5m to simulate the sound wave standing wave and attenuation law under different silencer sizes.

[0011] Furthermore, the sound pressure sensor array includes multiple sound pressure sensors; the sound pressure sensors are arranged at at least three cross-sectional positions along the axial and radial directions of the silencing section, including the inlet cross-section, the middle cross-section and the outlet cross-section, with at least four sensors arranged in each cross-section to achieve multi-point synchronous measurement of the spatial distribution of sound pressure level.

[0012] Furthermore, the sound pressure sensor is an INV9202 type or equivalent dynamic sound pressure sensor, and the data acquisition unit includes an INV3062T type dynamic data acquisition instrument and a matching data processing module, which is used for real-time Fourier transform analysis of the sound wave frequency spectrum and attenuation curve.

[0013] Furthermore, the fan is driven by a variable frequency drive, and the air volume adjustment range is 350m³ / h. 3 / min to 550m 3 / min, to simulate the airflow-sound coupling effect of a mining dust collector under different operating conditions.

[0014] Furthermore, the system also includes an air outlet noise testing module, which is located downstream of the silencer section and is used to compare the internal and external sound pressure level attenuation to provide an overall performance evaluation of the silencer.

[0015] Furthermore, the filtration section is a wet filtration structure, including a spray device to simulate the effect of water mist on sound wave scattering.

[0016] A test method for noise propagation characteristics of a mine wet dust collector based on the above test system includes the following steps:

[0017] (1) Set up the test system and connect all components to ensure smooth airflow;

[0018] (2) Set operating parameters, including replacing the silencer modules with different cross-sectional shapes, adjusting the length of the silencer section and the air volume of the fan;

[0019] (3) Start the fan to generate simulated airflow and excite the sound wave source in the silencer section;

[0020] (4) Acquire sound wave intensity and frequency data simultaneously at multiple cross-sectional locations using a sound pressure sensor array for at least 10 seconds;

[0021] (5) Use the data acquisition unit to process the data, calculate the sound pressure level attenuation rate and frequency spectrum distribution, so as to determine the optimization parameters for the silencer design.

[0022] Furthermore, in step (4), the frequency range of the acquisition covers 20Hz to 20kHz, including low frequency <500Hz and high frequency components >2000Hz, and the acoustic coherence between adjacent cross sections is calculated to quantify the reflection and superposition effects.

[0023] Furthermore, in step (5), the analysis includes establishing a sound pressure level attenuation model, considering the influence of air volume and cross-sectional shape on the attenuation rate, and outputting recommended parameters for the length and shape of the silencer for different working conditions.

[0024] Furthermore, it also includes step (6): verifying the optimized design by adding sound-absorbing materials in the sound-absorbing section, repeating the test to compare the attenuation efficiency, and improving the targeting of noise control.

[0025] The beneficial effects of this invention are as follows:

[0026] 1. This invention simulates the dust environment of a mine by using an independently set dust generator, realistically reproducing the interference of dust on airflow and sound wave propagation, thus overcoming the deficiency of traditional test systems in lacking dust simulation. The standard air duct is equipped with an air regulating valve and a micro-manometer to achieve precise control of airflow and pressure, ensuring operational stability and improving test repeatability by more than 30%.

[0027] 2. The replaceable cross-section silencing section adopts a modular design, supporting switching between rectangular and circular cross-sections, with an adjustable length (1-5m). It can comprehensively test the sound wave reflection, standing wave, and attenuation patterns under different pipe geometries, with data covering low-frequency (<500Hz) and high-frequency (>2000Hz) components, revealing complex sound field characteristics. A multi-point sound pressure sensor array (≥4 points per cross-section), combined with the real-time Fourier transform function of the INV3062T data acquisition unit, accurately captures the spatial distribution and coherence of the sound pressure level within the silencing section, improving data accuracy by 20%. The spray device in the wet filter section simulates the effect of water mist on sound wave scattering, extending its applicability to wet silencer testing.

[0028] 3. Experimental Methods: Through parametric analysis, a sound pressure level attenuation model was established, and optimized design parameters were output to improve the attenuation efficiency of the silencer. The outlet noise testing module further verified the overall effectiveness and reduced the risk of secondary noise.

[0029] 4. The present invention has a modular structure and is easy to operate, which significantly improves the pertinence and efficiency of noise control for mine wet dust collectors, and provides technical support for safe production and occupational health in coal mines.

[0030] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0031] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0032] Figure 1 This is a schematic diagram of the noise propagation characteristics test system for a wet dust collector used in mining, as described in an embodiment of the present invention.

[0033] Figure 2 This is a cross-sectional schematic diagram of a noise reduction module according to the present invention.

[0034] Figure labels: 1-Dust generator; 2-Micro manometer; 3-Air regulating valve; 4-Standard air duct; 5-Filter section; 6-Fan; 7-Dehydration section; 8-Silencing section; 9-Data acquisition unit; 10-Sound pressure sensor. Detailed Implementation

[0035] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0036] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0037] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0038] Example 1

[0039] Please see Figures 1-2An experimental system was built based on the KCS-550D(C) dust collector structure. The dust generator 1 (standard mine dust generator, particle size 0-150μm) was connected to the inlet of the standard ventilation duct 4 via a pipeline, injecting simulated dust to reproduce the dust environment of a mine. The standard ventilation duct 4 (2m in length) was equipped with an air regulating valve 3 and a micro-manometer 2. The air regulating valve 3 was set to an initial airflow of 350m³. 3 The pressure monitored by the micro-manometer 2 is stable at 500Pa (fluctuation <±10Pa). The filter section 5 adopts a wet dust removal module with a spray device to simulate a water mist environment.

[0040] 6-power fan matched with 550m 3 The airflow is driven through the system at a speed of [speed] / min. The dehydration section 7, located downstream of the fan 6, removes moisture from the wet filter, ensuring the airflow enters the silencing section 8 dry. The silencing section 8 uses a rectangular cross-section module, 3m in length, and internally houses an array of 10 sound pressure sensors (INV9202 model, 4 points per cross-section, covering the inlet, middle, and outlet sections). The data acquisition unit 9 (INV3062T dynamic data acquisition instrument and software) processes the data in real time.

[0041] The test steps include:

[0042] (1) Set up the system and ensure that components 1-8 are connected in series and connected to dust generator 1;

[0043] (2) Operating conditions: Air volume 350m³ 3 / min, rectangular cross-section, length 3m;

[0044] (3) Start the dust generator 1 and the fan 6 to inject dust and generate sound waves;

[0045] (4) Collect sound wave data, with a collection range of 20Hz-20kHz, for 10 seconds;

[0046] (5) The sound pressure level decreased from 95 dB(A) at the entrance to 72 dB(A) at the exit. The low frequency (<500Hz) attenuation was dominant, and the attenuation fluctuation was increased by about 5% due to dust interference.

[0047] Example 2

[0048] In this embodiment, the silencing section 8 is replaced with a circular cross-section module, and the length is adjusted to 1m, 2m, 4m, and 5m. The air regulating valve 3 is set to an air volume of 500m³ / h. 3The pressure fluctuation was monitored by the micro-manometer 2 at a rate of <±10Pa. Dust generator 1 continuously injected dust, the filtration section 5 maintained a wet spray, and the dehydration section 7 removed moisture. The sound pressure sensor array 10 collected data, and the data acquisition unit 9 analyzed the data, showing that the circular cross-section reduced the standing wave effect and improved high-frequency (>2000Hz) attenuation by 15%. The experimental procedures were the same as in Example 1, with the addition of parametric testing (25 sets of operating conditions) to calculate the sound wave coherence of adjacent cross-sections and quantify reflection and superposition effects.

[0049] Example 3

[0050] This embodiment is optimized for humid environments. Filter section 5 enhances spray intensity to simulate high humidity conditions, while dehydration section 7 ensures dry airflow. Silencing section 8 uses rectangular and circular cross-sections (3m in length) with an airflow of 450m³. 3 The pressure is controlled within ±10 Pa at a rate of [per unit unspecified]. Dust is injected into the dust generator 1, and the sound pressure sensor 10 collects the data. The data acquisition unit 9 analyzes the combined effect of humidity and dust on sound absorption and optimizes the design of the sound-absorbing section containing sound-absorbing materials. The outlet noise test module records the external sound pressure level to verify the overall attenuation efficiency.

[0051] Example 4

[0052] This embodiment adds verification and optimization design. Microporous sound-absorbing material is added within the silencing section 8, and the operating conditions of Embodiments 1 and 2 are repeated (air volume 350m³ / h). 3 / min and 500m 3 / min (rectangular and circular cross-sections), pressure controlled within ±10Pa. Dust generator 1 and filter section 5 simulate a real mine environment, while dehydration section 7 maintains airflow stability. Data acquisition unit 9 records attenuation efficiency improved to 40dB, verifies the applicability of design parameters, and outputs recommended silencer length and shape parameters.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A system for testing the noise propagation characteristics of a mine wet dust collector, characterized in that, It includes a dust generator and a standard air duct, filter section, fan, dehydration section, and silencing section connected in series, as well as a sound pressure sensor array and data acquisition unit; The dust generator is used to inject dust into a standard air duct to simulate a mine dust environment. The standard air duct is equipped with an air regulating valve and a micro-manometer to regulate the airflow volume and monitor the airflow pressure. The filtration section is used to capture dust. The fan drives the airflow through the system. The dehydration section removes moisture. The silencing section is used for noise reduction. The sound pressure sensor array is detachably arranged at multiple cross-sectional positions inside the silencing section to collect sound wave intensity, frequency, and phase data in real time. The data acquisition unit is electrically connected to the sound pressure sensor array to synchronously process and store the collected data to analyze the propagation and attenuation characteristics of sound waves in the silencing section. The silencing section includes multiple interchangeable silencing modules, each with a different cross-sectional shape, including a rectangular cross-section and a circular cross-section. The rectangular cross-section is used to simulate the propagation characteristics of a rectangular pipe, and the circular cross-section is used to simulate the propagation characteristics of a circular pipe, in order to test the differences in sound wave reflection and superposition effects. The sound pressure sensor array includes multiple sound pressure sensors; the sound pressure sensors are arranged at at least three cross-sectional positions along the axial and radial directions of the silencing section, including the inlet cross-section, the middle cross-section and the outlet cross-section, with at least 4 sensors arranged in each cross-section to achieve multi-point synchronous measurement of the spatial distribution of sound pressure level; The system also includes an outlet noise testing module, which is located downstream of the silencer section to compare the internal and external sound pressure level attenuation and provide an overall performance evaluation of the silencer.

2. The noise propagation characteristic test system for mine wet dust collectors according to claim 1, characterized in that, The length of the silencing section is 1 m to 5 m to simulate the sound wave standing wave and attenuation law under different silencer sizes.

3. The noise propagation characteristic test system for mine wet dust collectors according to claim 1, characterized in that, The sound pressure sensor is an INV9202 type or equivalent dynamic sound pressure sensor, and the data acquisition unit includes an INV3062T type dynamic data acquisition instrument and a matching data processing module, which is used for real-time Fourier transform analysis of sound wave frequency spectrum and attenuation curve.

4. The noise propagation characteristic test system for a mine wet dust collector according to claim 1, characterized in that, The fan is driven by a variable frequency drive, and the air volume can be adjusted from 350 m³ / min to 550 m³ / min to simulate the airflow-sound wave coupling effect under different working conditions of a mining dust collector.

5. The noise propagation characteristic test system for mine wet dust collectors according to claim 1, characterized in that, The filtration section is a wet filtration structure, including a spray device, used to simulate the effect of water mist on sound wave scattering.

6. A method for testing the noise propagation characteristics of a mine wet dust collector based on the noise propagation characteristic test system of any one of claims 1 to 5, characterized in that, Includes the following steps: (1) Set up the test system and connect all components to ensure smooth airflow; (2) Set operating parameters, including replacing the silencer modules with different cross-sectional shapes, adjusting the length of the silencer section and the air volume of the fan; (3) Start the fan to generate simulated airflow and excite the sound wave source in the silencer section; (4) Acquire sound wave intensity and frequency data simultaneously at multiple cross-sectional locations using a sound pressure sensor array for at least 10 seconds; (5) Use the data acquisition unit to process the data, calculate the sound pressure level attenuation rate and frequency spectrum distribution, so as to determine the optimization parameters for the silencer design.

7. The test method for noise propagation characteristics of a wet dust collector for mining according to claim 6, characterized in that, In step (4), the frequency range of acquisition covers 20 Hz to 20 kHz, including low frequency <500 Hz and high frequency components >2000 Hz, and the acoustic coherence between adjacent cross sections is calculated to quantify reflection and superposition effects.

8. The test method for noise propagation characteristics of a wet dust collector for mining according to claim 6, characterized in that, In step (5), the analysis includes establishing a sound pressure level attenuation model, considering the influence of air volume and cross-sectional shape on the attenuation rate, and outputting recommended parameters for the length and shape of the silencer for different working conditions.

9. The test method for noise propagation characteristics of a wet dust collector for mining according to claim 6, characterized in that, It also includes step (6): verifying the optimized design by adding sound-absorbing materials in the sound-absorbing section and repeating the test to compare the attenuation efficiency, thereby improving the targeting of noise control.

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