Mining wet dust collector noise propagation characteristic test system and method

Abstract

The invention discloses a system and a method for testing noise propagation characteristics of a mining wet dust collector. The system comprises an independent dust generator, and a standard air duct, a filtering section, a fan, a dewatering section, a section-replaceable silencing section, a sound pressure sensor array and a data acquisition unit which are sequentially connected in series. The dust generator injects dust of 0-150 microns into the standard air duct to simulate a mine dust environment; the standard air duct is provided with an air regulating valve and a micromanometer to regulate and control air volume and pressure; the filtering section comprises a spraying device, the dewatering section removes moisture, and the silencing section module tests sound wave propagation. The sound pressure sensor array acquires sound wave intensity and frequency data, and the data acquisition unit analyzes an attenuation law. According to the test method, the design of the silencer is optimized through working condition setting and data acquisition and analysis. The system is modularized in structure, accurate in data, suitable for mine noise control research and wide in applicability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mine dust removal equipment, and particularly relates to a mine wet dust collector noise propagation characteristic test system and method. BACKGROUND

[0002] The mine wet dust collector is an indispensable equipment in the underground ventilation system of a coal mine, which is used for capturing dust and purifying air to protect the health of miners and production safety. However, the high-intensity noise (90-110 dB(A)) generated in the operation process of the mine wet dust collector far exceeds the national occupational health standard (≤85 dB(A)), and becomes the main source of noise pollution in the mine. The noise is mainly composed of the aerodynamic noise caused by the high-speed rotation of the fan blade, the turbulent flow noise in the dust removal process, and the pipeline vibration radiation noise. When these noises propagate in the limited space inside the dust collector, due to the complex physical phenomena such as reflection, refraction, diffraction and superposition, the sound pressure level presents a non-uniform distribution at different positions, especially a local sound pressure peak may be formed at the air outlet, which seriously affects the working environment and the performance of the equipment.

[0003] At present, the most effective measure for the noise control of the mine wet dust collector is to set a muffler at the air outlet, which usually adopts an impedance type or a micro-porous type structure to realize the attenuation through the interaction of sound waves and materials. However, the existing muffler design mostly depends on empirical formulas or general models, and ignores the specific working condition factors of the mine dust collector, such as high air volume (350-550 m 3 / min), pulsating airflow, complex pipeline geometry (rectangular or circular cross section) and dust interference. These factors make it difficult to predict the propagation characteristics of sound waves in the sound attenuation section. For example, in the rectangular pipeline, the sound waves are easy to form standing waves or tangential modes, which amplify the local sound pressure; in the sound attenuation section with different lengths (1-5 m), the low-frequency noise (<500 Hz) is insufficiently attenuated, while the high-frequency noise (>2000 Hz) is enhanced due to the influence of wind speed. In addition, the dust concentration is high (particle size 5-50 μm) in the mine environment, which will interfere with the propagation of airflow and sound waves. The traditional test system lacks an independent dust simulation device, and cannot truly reproduce this effect.

[0004] The existing noise propagation test system has significant limitations. First, the traditional wind tunnel test platform can simulate airflow, but does not integrate a dust generation device, and it is difficult to reflect the scattering and attenuation effect of mine dust on the propagation of sound waves. Second, the sensor arrangement is single, and usually only measures at the air outlet or a single cross section, which is difficult to capture the sound field distribution at multiple points in the sound attenuation section, resulting in a lack of spatial representativeness of the data. Third, the airflow regulation and pressure monitoring capacity of the standard wind tunnel is insufficient, and the existing system is not equipped with an air regulating valve and a micro-pressure gauge, which cannot accurately control the air volume (350-550 m 3The fluctuation of air flow (± 0.5 m / s) and pressure fluctuation (± 10 Pa) affects the test repeatability. In addition, the wet dust collector involves water mist injection, and the humidity has a significant effect on the scattering and absorption of sound waves, but the existing dry test model cannot simulate this effect, which limits the optimal design of the wet silencer. The literature shows that the airflow-sound coupling at high wind speed (> 15 m / s) can reduce the attenuation efficiency by more than 30%, and the synergistic effect of dust and humidity further complicates the characteristics of the sound field, and the existing technology lacks a systematic research method to quantify these effects. SUMMARY

[0005] Therefore, the purpose of the present application is to solve the problem of lack of targeted data in silencer design, and to provide a mine wet dust collector noise propagation characteristic test system and method. The system accurately simulates the sound wave propagation environment under the mine working condition by using an independent dust generator and a standard air duct, a filter section, a fan, a different cross-section shape of a silencer module, combined with an array of sound pressure sensors and a data acquisition unit, and optimizes the design of the silencer.

[0006] To achieve the above purpose, the present application provides the following technical scheme:

[0007] A mine wet dust collector noise propagation characteristic test system, comprising a dust generator and a standard air duct, a filter section, a fan, a dehydration section, and an acoustic silencer module connected in series, and an array of sound pressure sensors and a data acquisition unit;

[0008] The dust generator is used to inject dust into the standard air duct to simulate the mine dust environment, and the standard air duct is provided with an air regulating valve and a micro pressure gauge for regulating the air flow and monitoring the air pressure. The filter section is used to capture dust, the fan drives the airflow through the system, the dehydration section removes moisture, and the acoustic silencer module is used for acoustic treatment. The array of sound pressure sensors is detachably arranged at multiple cross-section positions inside the acoustic silencer module for real-time acquisition of sound wave intensity, frequency and phase data. The data acquisition unit is electrically connected to the array of sound pressure sensors for synchronous processing and storage of the collected data to analyze the propagation and attenuation characteristics of sound waves in the acoustic silencer module.

[0009] Further, the acoustic silencer module comprises a plurality of interchangeable acoustic silencer modules, each having 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 to test the differences in sound wave reflection and superposition effects.

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

[0011] Further, the sound pressure sensor array comprises a plurality of sound pressure sensors; the sound pressure sensors are arranged in at least three cross-section positions along the axial and radial direction of the sound attenuation section, including an inlet cross-section, a middle cross-section and an outlet cross-section, and each cross-section is arranged with at least 4 sensors to realize multi-point synchronous measurement of sound pressure level spatial distribution.

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

[0013] Further, the fan is driven by frequency conversion, and the air volume adjustment range is 350m 3 / min to 550m 3 / min, so as to simulate the airflow-sound wave coupling effect of the mine dust remover under different working conditions.

[0014] Further, the system further comprises an air outlet noise test module arranged downstream of the sound attenuation section, which is used for comparing the internal and external sound pressure level attenuation and providing overall performance evaluation of the silencer.

[0015] Further, the filter section is a wet filter structure comprising a spraying device for simulating the influence of water mist on sound wave scattering.

[0016] A mine wet dust remover noise propagation characteristic test method based on the above test system, comprising the following steps:

[0017] (1) building the test system and connecting each component to ensure smooth airflow;

[0018] (2) setting working condition parameters, including replacing sound attenuation modules with different cross-sectional shapes, adjusting the length of the sound attenuation section and the air volume value of the fan;

[0019] (3) starting the fan to generate simulated airflow and exciting the sound wave source in the sound attenuation section;

[0020] (4) synchronously collecting sound wave intensity and frequency data at multiple cross-section positions by the sound pressure sensor array for at least 10 seconds;

[0021] (5) processing data by the data acquisition unit, calculating sound pressure level attenuation rate and frequency spectrum distribution to determine silencer design optimization parameters.

[0022] Further, in step (4), the frequency range covers 20Hz to 20kHz, including low frequency <500Hz and high frequency >2000Hz, and the sound wave coherence between adjacent cross-sections is calculated to quantify the reflection and superposition effect.

[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 and repeating the test to compare the attenuation efficiency, thereby improving the targeted nature 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] Fig. 1 Figure 1 is a schematic diagram of a noise propagation characteristic test system of a mine-used wet dust collector in an embodiment of the present application.

[0033] Fig. 2 Figure 2 is a schematic diagram of a cross section of a noise elimination module in the present application.

[0034] Reference signs: 1 - dust generator; 2 - micro-pressure gauge; 3 - air regulating valve; 4 - standard wind tube; 5 - filtering section; 6 - fan; 7 - dewatering section; 8 - noise elimination section; 9 - data acquisition unit; 10 - sound pressure sensor. DETAILED DESCRIPTION

[0035] The present application can be implemented or applied in other different specific embodiments, and the details in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application. It should be noted that the drawings provided in the following embodiments only schematically illustrate the basic concept of the present application, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0036] The drawings are only used for exemplary illustration, and the representation is only a schematic diagram, not a physical diagram, and should not be understood as a limitation of the present application; in order to better illustrate the embodiments of the present application, some components in the drawings are omitted, enlarged or reduced, and do not represent the size of the actual product; it is understandable for those skilled in the art that some known structures and their descriptions in the drawings can be omitted.

[0037] The same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore the terms describing the positional relationship in the drawings are only used for exemplary illustration, and should not be understood as a limitation of the present application, and for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0038] Embodiment 1

[0039] Please refer to Figs. 1-2, based on KCS-550D(C) dust collector structure to build test system. Dust generator 1 (standard mine dust generator, particle size 0-150 μm) is connected to the standard wind tunnel 4 inlet through the pipeline, and the simulated dust is injected to reproduce the mine dust environment. The standard wind tunnel 4 (length 2m) is equipped with air valve 3 and micro pressure gauge 2, air valve 3 sets the initial air volume 350m 3 / min, and the micro pressure gauge 2 monitors the pressure to be stable at 500Pa (fluctuation <±10Pa). The filter section 5 uses a wet dust removal module containing a spray device to simulate a water mist environment.

[0040] The fan 6 is power matched 550m 3 / min, driving the airflow through the system. The dehydration section 7 is arranged downstream of the fan 6 to remove the moisture after wet filtration, ensuring that the airflow is dry into the sound attenuation section 8. The sound attenuation section 8 selects a rectangular cross-section module with a length of 3m, and an array of sound pressure sensors 10 (INV9202 type, 4 points per cross-section, covering the inlet, middle and outlet cross-sections) is arranged inside. The data acquisition unit 9 (INV3062T dynamic data acquisition instrument and software) processes data in real time.

[0041] The test steps include:

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

[0043] (2) Set the working condition: air volume 350m 3 / min, rectangular cross-section, length 3m;

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

[0045] (4) Collect sound wave data, collect range 20Hz-20kHz, duration 10 seconds;

[0046] (5) Analyze the sound pressure level from the inlet 95dB(A) to the outlet 72dB(A), the low frequency (<500Hz) attenuation is dominant, and the dust interference increases about 5% attenuation fluctuation.

[0047] Example 2

[0048] This example is based on example 1, replacing the sound attenuation section 8 with a circular cross-section module, adjusting the length to 1m, 2m, 4m, 5m, and setting the air valve 3 to 500m 3 / min, the micro-pressure gauge 2 monitors pressure fluctuation <±10 Pa. The dust generator 1 continuously injects dust, the filter section 5 maintains wet spraying, and the dehydration section 7 removes moisture. The array of sound pressure sensors 10 collects data, and the data acquisition unit 9 analyzes and displays the reduction of standing wave effects in a circular cross-section, with high-frequency (>2000 Hz) attenuation improved by 15%. The test steps are the same as in Example 1, with the addition of parameterized testing (25 groups of working condition combinations), calculation of the coherence of sound waves in adjacent sections, and quantification of reflection and superposition effects.

[0049] Example 3

[0050] This example is optimized for a wet environment. The filter section 5 enhances the intensity of spraying, simulating high-humidity conditions, and the dehydration section 7 ensures airflow dryness. The sound attenuation section 8 uses rectangular and circular cross-sections (length 3 m), with an air volume of 450 m 3 / min, and pressure controlled at ±10 Pa. The dust generator 1 injects dust, the sound pressure sensor 10 collects data, and the data acquisition unit 9 analyzes the effects of humidity and dust synergy on sound absorption, optimizing the design of the sound attenuation section containing sound attenuation materials. The air outlet noise test module records external sound pressure level, verifying overall attenuation efficiency.

[0051] Example 4

[0052] This example adds verification of the optimized design. Micro-porous sound attenuation materials are added to the sound attenuation section 8, and the working conditions of Examples 1 and 2 are repeated (air volume 350 m 3 / min and 500 m 3 / min, rectangular and circular cross-sections), with pressure controlled at ±10 Pa. The dust generator 1 and the filter section 5 simulate real mine environments, and the dehydration section 7 maintains airflow stability. The data acquisition unit 9 records an attenuation efficiency improvement of up to 40 dB, verifying the applicability of design parameters and outputting recommended sound attenuator length and shape parameters.

[0053] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the spirit and scope of the present application, and all should be included in the scope of the claims of the present application.

Claims

1. A system for testing the noise propagation characteristics of a mine wet dust collector, characterized in that, The system comprises a dust generator and a series of standard ducts, a filtering section, a fan, a dewatering section, a sound attenuation section, an array of sound pressure sensors and a data acquisition unit. The dust generator is used to inject dust into the standard ducts to simulate a mine dust environment, and the standard ducts are provided with air regulating valves and micro pressure gauges for regulating air flow and monitoring air pressure; the filtering section is used to capture dust, the fan drives air flow through the system, the dewatering section removes moisture, the sound attenuation section is used for sound attenuation processing, and the array of sound pressure sensors is detachably arranged at multiple cross-sectional positions inside the sound attenuation section for real-time acquisition of sound wave intensity, frequency and phase data, and the data acquisition unit is electrically connected to the array of sound pressure sensors for synchronous processing and storage of the acquired data to analyze the propagation and attenuation characteristics of sound waves in the sound attenuation section.

2. The mine-usable wet scrubber noise propagation characteristics test system according to claim 1, characterized in that, The sound attenuation section comprises a plurality of interchangeable sound attenuation modules, each having a different cross-sectional shape, including rectangular cross-sections and circular cross-sections, the rectangular cross-sections being used to simulate the propagation characteristics of rectangular pipes, and the circular cross-sections being used to simulate the propagation characteristics of circular pipes to test the differences in sound wave reflection and superposition effects.

3. The mine-usable wet scrubber noise propagation characteristics test system of claim 2, wherein, The length of the sound attenuation section is 1m-5m to simulate the sound wave standing wave and attenuation law under different muffler sizes.

4. The mine-usable wet precipitator noise propagation characteristics test system according to claim 1, characterized in that, The array of sound pressure sensors comprises a plurality of sound pressure sensors; the sound pressure sensors are arranged in at least three cross-sectional positions in the axial and radial directions of the sound attenuation section, including an inlet cross-section, an intermediate cross-section and an outlet cross-section, and at least 4 sensors are arranged at each cross-section to achieve multi-point synchronous measurement of sound pressure level spatial distribution.

5. The mine-usable wet scrubber noise propagation characteristics test system of claim 4, wherein, The sound pressure sensors are INV9202 type or equivalent dynamic sound pressure sensors, and the data acquisition unit comprises an INV3062T type dynamic data acquisition instrument and a matching data processing module for real-time Fourier transform analysis of sound wave frequency spectrum and attenuation curve.

6. The mine-usable wet precipitator noise propagation characteristics test system according to claim 1, characterized in that, The fan adopts frequency conversion driving, and the air volume adjusting range is 350m 3 / min to 550m 3 / min, to simulate the airflow-sound wave coupling effect of the mine dust remover under different working conditions.

7. The mine-usable wet precipitator noise propagation characteristics test system, as claimed in claim 1, wherein, The system further comprises an air outlet noise test module arranged downstream of the sound attenuation section for comparison of internal and external sound pressure level attenuation to provide overall performance evaluation of the muffler.

8. The mine-usable wet precipitator noise propagation characteristics test system, as claimed in claim 1, wherein, The filtering section is a wet filtering structure comprising a spray device for simulating the influence of water mist on sound wave scattering.

9. A method for testing the noise propagation characteristics of a mine wet dust collector based on the test system according to claims 1 to 8, characterized in that, The system comprises the following steps: (1) building a test system and connecting various components to ensure smooth air flow; (2) setting working condition parameters, including replacing sound attenuation modules with different cross-sectional shapes, adjusting the length of the sound attenuation section and the air volume of the fan; (3) starting the fan to generate simulated air flow and exciting a sound wave source in the sound attenuation section; (4) synchronously collecting sound wave intensity and frequency data at multiple cross-sectional positions by the array of sound pressure sensors for at least 10 seconds; (5) processing the data by the data acquisition unit to calculate sound pressure level attenuation rate and frequency spectrum distribution to determine muffler design optimization parameters.

10. The mine-usable wet precipitator noise propagation characteristic test method according to claim 9, characterized by, In step (4), the frequency range covers 20Hz to 20kHz, including low frequency <500Hz and high frequency >2000Hz components, and the sound wave coherence between adjacent cross-sections is calculated to quantify the reflection and superposition effects.

11. The mine-usable wet precipitator noise propagation characteristic test method according to claim 9, characterized by, In step (5), the analysis includes establishing a sound pressure level attenuation model considering the influence of air volume and cross-sectional shape on attenuation rate, and outputting recommended parameters of muffler length and shape for different working conditions.

12. The mine-usable wet precipitator noise propagation characteristic test method according to claim 9, characterized by, Also includes step (6): verification of optimization design, by adding sound-absorbing material in the sound-absorbing section, repeated test comparison of attenuation efficiency, improve the pertinence of noise control.

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