CN104315879A - Noise control method for cooling tower - Google Patents
Noise control method for cooling tower Download PDFInfo
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- CN104315879A CN104315879A CN201410593501.5A CN201410593501A CN104315879A CN 104315879 A CN104315879 A CN 104315879A CN 201410593501 A CN201410593501 A CN 201410593501A CN 104315879 A CN104315879 A CN 104315879A
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Abstract
The invention provides a noise control method for a cooling tower and relates to a noise control method. The noise control method for the cooling tower comprises the following steps: firstly measuring noise by adopting a B&K high precision noise spectrum analyzer and a TES noise sound level meter, determining the noise according to a noise source, mounting a resistive muffler at a propagation path position, preventing energy of the noise from propagating by adopting a combined type sound barrier, and mounting a damping sound barrier and a wide band combined type sound absorption material, wherein a sound attenuation piece is arranged in the middle of a wide band chip silencer, and the side walls at the left side and the right side are provided with sound absorption materials or have sound absorption structures; and based on field test and analysis and a noise sensitive spot position, isolating the noise by mounting a sound insulation barrier. The noise control method for the cooling tower has the advantages that a noise attenuation effect is obvious, requirements of equipment on ventilation quantity and temperature can be completely met, and a reference is provided for noise control on the cooling tower in engineering practice, so that the noise control method for the cooling tower has guiding significance.
Description
Technical field
The present invention relates to a kind of noise control method, particularly relate to a kind of noise control method of cooling tower.
Background technology
Because the noise of cooling tower own is higher, do not do noise reduction process to its noise, according to existing national noise criteria, cooling tower buzz has certain interference to the high residential building resident family near it.And the fan noise, falling water noise and the structure borne noise that produce during the operation of cooling tower equipment also can affect greatly surrounding environment.
Summary of the invention
The object of the present invention is to provide a kind of noise control method of cooling tower, the present invention analyzes cooling tower buzz source, according to surveyed noise signal, analyzes its frequency spectrum, judges the main frequency producing noise.Carry out detection to the noise source at scene and propagation path to analyze simultaneously, and from eliminating the noise, several aspect that absorbs sound and insulate against sound set forth the noise abatement scheme blocking sound transmission, makes noise reduction reach ideal effect.
The object of the invention is to be achieved through the following technical solutions:
A noise control method for cooling tower, described method comprises noise source specificity analysis, noise abatement scheme and noise reduction measure; First, with B & K high accuracy noise spectrum analyzer and TES noise level meter, noise is measured, according to noise source, determine noise, dissipative muffler is arranged on propagation path position, combined sound barrier is adopted to stop noise energy to be propagated, install damping sound-insulation board and broadband combined type sound-absorbing material, be anechoic sheet in the middle of broadband strip-type silencer, the sidewall of the left and right sides is sound-absorbing material or sound absorption structure; Based on field test and analysis and sensitive point for noise position, by arranging sound insulation sound barrier to noise isolation.For obtaining maximum oise insulation factor, sound barrier concrete structure be the bottom of sound barrier adopt every-inhale-every fabricated structure, adopt damping sound-insulation board to do its sound insulation wall body, prevent sound barrier to be subject to acoustic wave excitation to produce covibration, the gobo body of sound barrier adopts Assembled plate for absorbing acoustic energy; Acoustic screen body adopts doubling plate sound insulating structure, and outermost layer adopts damping sound-insulation board, damping sound insulating material during innermost layer adopts.
The noise control method of described a kind of cooling tower, described acoustic screen body wherein retains 2 millimeter distances as air layer between two-layer sound insulating material.
The noise control method of described a kind of cooling tower, describedly determines sound barrier noise attentuation value according to scene, determines sound barrier effective depth.
Advantage of the present invention and effect are:
1. by the measurement of the present invention to its noise data, the source of labor cooling tower buzz and characteristic, and set forth a kind of control measure of practicality from aspects such as noise elimination, sound absorption, sound insulation.Result shows, this scheme not only noise reduction is obvious, and can meet the requirement of ventilation needed for equipment and temperature completely, in engineering reality, the noise abatement of cooling tower provides reference, has directive significance.
2. the present invention is according to surveyed noise signal, analyzes its frequency spectrum, judges the main frequency producing noise.Set forth from noise elimination, sound absorption and sound insulation three aspects the noise abatement scheme blocking sound transmission, improved noise reduction.Therefore the method is a set of effective control measure, and noise reduction is obvious, can meet the requirement of national technical standard completely, for the noise processed of other cooling tower provides reference.
Accompanying drawing explanation
Fig. 1 cooling tower photo site;
Fig. 2 cooling tower buzz point layout figure;
The noise pattern of Fig. 3 measuring point 9;
Photo after Fig. 4 cooling tower Project of Denoising is completed;
Fig. 5 anechoic sheet structural representation;
Fig. 6 every-inhale-every combined sound barrier structural representation;
Fig. 7 suction-every combined sound barrier structural representation;
Fig. 8 sound barrier gobo body sound absorption characteristics curve;
Fig. 9 sound barrier design sketch;
The board-like suspended absorber structure chart of Figure 10;
The board-like suspended absorber design sketch of Figure 11.
Detailed description of the invention
Below in conjunction with accompanying drawing illustrated embodiment, the invention will be further described.
Embodiment:
1 noise source specificity analysis
The present embodiment belongs to formula apartment, high-grade commercial hotel, and cooling tower is positioned at north side annex roof (as shown in Figure 1), Qi Nan, west, the contiguous house in side, north three.According to the relevant regulations in GB3096-93 " standard of environmental noise of urban area ", when cooling tower runs, each sensitive point for noise must reach the requirement of 2 class standards in " standard of environmental noise of urban area " near it, namely 60dB (A) between daytime, 50dB at night (A).The daily life impact of the noise pollution that this equipment operationally produces on surrounding resident is larger.
In order to reach the effect of noise optimum control, first, operating personnel, with B & K high accuracy noise spectrum analyzer and TES noise level meter, have carried out accurate measurement to noise in the blower fan of cooling tower water conservancy diversion mouth of pipe, blower fan surrounding environment and garden respectively.
When stablizing Deng test environment sound field state, operating personnel record measurement noises equivalent sound pressure level and noise spectrum in one minute.As shown in Figure 2, wherein Fig. 3 is the spectrogram of measuring point 9 to cooling tower buzz point layout figure.In fig. 2, alphabetical A and B represents two cooling towers respectively, and measuring point is one meter from cooling tower horizontal range, and from the vertical height 1.5m on roof ground, table 1 is measurement noises acoustic pressure data.
To the data analysis of on-the-spot test, from measuring point 1 to measuring point 10, average noise reaches 71.4dB, and along with the increase of distance, the energy of noise is in decay.
The noise sound (dB) of table 1 measuring point
Fan noise is cooling tower main noise source.Fan noise is the noise caused by broadband air-flow that the turbulent flow of vane drive air generation causes.Meanwhile, the recirculated water of cooling tower is through upper spray pipe toward dirty, and by entering water falling groove after packing layer, the impact noise of generation is also one of noise source.
2 noise abatement scheme and noise reduction measures
According to cooling tower on-site actual situations, and in conjunction with cooling tower main noise source, thus determine that the falling water noise of cooling tower and the low-frequency noise of blower fan are the emphasis of this project governance.
Resolution is as follows: first, and dissipative muffler is arranged on fan outlet position, like this can the propagation path of block noise energy.Consider again simultaneously and will ensure that cooling tower equipment has good thermal diffusivity when running, sound insulation process can not be closed to this equipment, therefore, combined sound barrier is adopted to stop the propagation of bottom noise energy, damping sound-insulation board and broadband combined type sound-absorbing material are installed in the middle part of cooling tower, effectively can reduce the diffraction of noise sound wave, produce a desired effect.As shown in Figure 4.
2.1 broadband strip-type silencer designs
?through the analysis to each measuring point noise pattern, obtaining blowing machine is the topmost noise source of cooling tower.Therefore, the object of noise reduction is reached at fan outlet place installing broad-band band strip-type silencer.
Broadband strip-type silencer performance is given prominence to, and has easy for installation, sound deadening capacity and the advantage such as resistive drag force is large, therefore in the position of fan outlet, and installing broad-band band strip-type silencer.Be anechoic sheet in the middle of this silencer, the sidewall of the left and right sides is sound-absorbing material or sound absorption structure.The structural representation of anechoic sheet as shown in Figure 5.
Below according to the derivation of one-dimensional theory formula, suppose that inner fluid passage speed is zero, the sound deadening capacity formula of strip-type silencer can be obtained:
In formula
for the relative acoustical conductivity of the side wall surface that absorbs sound,
for the acoustic absorptivity of side wall surface vertical incidence;
for the girth of channel cross-section
;
for channel cross-sectional area
;
for silencer length
.
In the structure of silencer,
,
,
can regard as and have nothing to do with axial X-coordinate, and
, therefore strip-type silencer sound deadening capacity computing formula:
Wherein Δ
lfor the sound deadening capacity of silencer;
lfor silencer length;
extinction coefficient.
acoustic absorptivity during-wall vertical incidence;
-channel width.
2.2 every-inhale-design every combined sound barrier
2.2.1 sound barrier acoustics design
Based on to sensitive point for noise position near the field test and analysis of cooling tower and cooling tower, by annex west, northern both sides youngster's wall is arranged sound insulation sound barrier and realize carrying out the comprehensive regulation to cooling tower buzz.In order to obtain maximum oise insulation factor, sound barrier concrete structure be the bottom of sound barrier adopt every-inhale-every fabricated structure.Adopt damping sound-insulation board to do its sound insulation wall body, mainly prevent sound barrier to be subject to acoustic wave excitation to produce covibration; Every-inhale-every combined sound barrier structure as shown in Figure 6, table 2 be every-suction-every combined sound barrier frequency band oise insulation factor.
Table 2 every-to inhale-every the frequency band oise insulation factor of combined sound barrier acoustic screen body
The low frequency part energy of this cooling tower buzz is comparatively large, and the diffracting power of low-frequency sound wave is very strong, therefore adopts on sound barrier top to inhale-and every combined sound barrier structure.The gobo body of sound barrier adopts Assembled plate for absorbing acoustic energy; Acoustic screen body adopts doubling plate sound insulating structure, and outermost layer adopts damping sound-insulation board, and damping sound insulating material during innermost layer adopts, wherein retains the distance of 2 millimeter as air layer between two-layer sound insulating material.Fig. 7 be inhale-every combined sound barrier structural representation, Fig. 8 is its gobo body sound absorption characteristics curve, and table 3 is the frequency band oise insulation factor of its acoustic screen body.
Table 3 inhales-every the frequency band oise insulation factor of combined sound barrier acoustic screen body
In conjunction with on-the-spot actual conditions, respectively the effectively process such as dust-proof, moistureproof is carried out as shown in Figure 9 to sound barrier.
2.2.2 sound barrier major parameter is determined
1) determination of sound barrier noise attentuation value
The theoretical foundation of sound barrier noise reduction is the wave theory of Huygens, namely sets up plate or a wall having enough surface densities in sound source with by between sound point, stops direct sound wave to be directly radiated by sound point place, thus makes direct sound wave change into sound diffraction field.Its diffraction acoustic attenuation of sound barrier is:
2) determination of sound barrier effective depth
This cooling tower southern side and west side are residential quarter, and its noise sound should reach the requirement of 2 class standards in GB3096-93 " standard of environmental noise of urban area ".According to the theoretical values of sound barrier attenuation, then according to the computing formula of noise diffracted sound field amount, and in conjunction with the actual position information that sound barrier is arranged, reversely can calculate the height of this sound barrier.Can obtain through calculating, the height of this sound barrier is three meter five.Table 4 is the different theoretical diffracted sound field values of sound barrier height.
The theoretical diffracted sound field value that table 4 sound barrier height is different
Because silencer is arranged on the air outlet position of blower fan of cooling tower, thus blocked the path that noise propagates from top, the noise that therefore bottom spreads out of becomes the Main Noise Sources of this equipment, and its sound pressure level is 75dB.Consider the air permeability that cooling tower is good and thermal diffusivity, it is infeasible for carrying out closing sound insulation process to it.Therefore the propagation of the method prevention bottom noise energy of inhaling every combined sound barrier is adopted.This sound barrier adopts sound absorption and the knockdown structure that insulates against sound, and wherein gobo adopts the knockdown sound absorption structure of broadband, and this suspended absorber structure is plank frame and adopts metal to make framework, and level lifts, and coating surface decorative layer.As shown in Figure 10, board-like suspended absorber design sketch as shown in figure 11 for the structure chart of board-like suspended absorber.
According to the locus at scene, when ensureing the best of overall noise reduction, consider construction cost simultaneously.Can draw through measuring and calculating, when suspended absorber laying area reaches 40 percent of machine room wall area, Noise measarement is optimum.
3 administer rear effect:
After improvement, noise reduction is obvious, through the on-the-spot test of national environmental protection department, at 1 meter of outside residential building window, the noise figure on daytime is down to 45.7 dB (A), and the noise figure at night is down to 42.6 dB (A), have passed the examination of environmental administration smoothly.Practice shows, the scope of application of the noise abatement scheme of this cover cooling tower is relatively wider, in engineering reality, the noise abatement of cooling tower provides reference, has directive significance.
Claims (3)
1. a noise control method for cooling tower, is characterized in that, described method comprises noise source specificity analysis, noise abatement scheme and noise reduction measure; First, with B & K high accuracy noise spectrum analyzer and TES noise level meter, noise is measured, according to noise source, determine noise, dissipative muffler is arranged on propagation path position, combined sound barrier is adopted to stop noise energy to be propagated, install damping sound-insulation board and broadband combined type sound-absorbing material, be anechoic sheet in the middle of broadband strip-type silencer, the sidewall of the left and right sides is sound-absorbing material or sound absorption structure; Based on field test and analysis and sensitive point for noise position, by arranging sound insulation sound barrier to noise isolation;
For obtaining maximum oise insulation factor, sound barrier concrete structure be the bottom of sound barrier adopt every-inhale-every fabricated structure, adopt damping sound-insulation board to do its sound insulation wall body, prevent sound barrier to be subject to acoustic wave excitation to produce covibration, the gobo body of sound barrier adopts Assembled plate for absorbing acoustic energy; Acoustic screen body adopts doubling plate sound insulating structure, and outermost layer adopts damping sound-insulation board, damping sound insulating material during innermost layer adopts.
2. the noise control method of a kind of cooling tower according to claim 1, is characterized in that, described acoustic screen body wherein retains 2 millimeter distances as air layer between two-layer sound insulating material.
3. the noise control method of a kind of cooling tower according to claim 1, is characterized in that, describedly determines sound barrier noise attentuation value according to scene, determines sound barrier effective depth.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106558302A (en) * | 2015-09-29 | 2017-04-05 | 国网智能电网研究院 | A kind of sound source device noise-reduction method |
| CN106610233A (en) * | 2017-01-10 | 2017-05-03 | 吴光明 | Silencing structure for power plant water cooling tower |
| CN107238314A (en) * | 2017-05-31 | 2017-10-10 | 四川省阳子森环保设备有限公司 | A kind of cooling tower noise controller |
| CN110633499A (en) * | 2019-08-19 | 2019-12-31 | 全球能源互联网研究院有限公司 | Sound barrier parameter determination method and device |
| CN111696768A (en) * | 2020-05-13 | 2020-09-22 | 云南电网有限责任公司 | Outdoor transformer noise reduction method |
| CN112447163A (en) * | 2019-08-29 | 2021-03-05 | 比亚迪股份有限公司 | Noise reduction method and acoustic silencing structure in vehicle cab |
| CN116305505A (en) * | 2023-05-25 | 2023-06-23 | 中建安装集团有限公司 | BIM technology and target optimization-based cooling tower noise reduction design method |
| CN117890478A (en) * | 2024-01-09 | 2024-04-16 | 上海申华声学装备有限公司 | Device for testing noise reduction material |
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| CN103149047A (en) * | 2013-03-08 | 2013-06-12 | 沈阳化工大学 | Cooling tower acoustic diagnosis method based on nonlinear mixed model |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106558302A (en) * | 2015-09-29 | 2017-04-05 | 国网智能电网研究院 | A kind of sound source device noise-reduction method |
| CN106558302B (en) * | 2015-09-29 | 2021-08-27 | 国网浙江省电力公司 | Noise reduction method for sound source equipment |
| CN106610233A (en) * | 2017-01-10 | 2017-05-03 | 吴光明 | Silencing structure for power plant water cooling tower |
| CN107238314A (en) * | 2017-05-31 | 2017-10-10 | 四川省阳子森环保设备有限公司 | A kind of cooling tower noise controller |
| CN110633499A (en) * | 2019-08-19 | 2019-12-31 | 全球能源互联网研究院有限公司 | Sound barrier parameter determination method and device |
| CN112447163A (en) * | 2019-08-29 | 2021-03-05 | 比亚迪股份有限公司 | Noise reduction method and acoustic silencing structure in vehicle cab |
| CN112447163B (en) * | 2019-08-29 | 2024-05-07 | 比亚迪股份有限公司 | Noise reduction method and acoustic noise elimination structure in vehicle cab |
| CN111696768A (en) * | 2020-05-13 | 2020-09-22 | 云南电网有限责任公司 | Outdoor transformer noise reduction method |
| CN111696768B (en) * | 2020-05-13 | 2023-04-11 | 云南电网有限责任公司 | Outdoor transformer noise reduction method |
| CN116305505A (en) * | 2023-05-25 | 2023-06-23 | 中建安装集团有限公司 | BIM technology and target optimization-based cooling tower noise reduction design method |
| CN116305505B (en) * | 2023-05-25 | 2023-10-20 | 中建安装集团有限公司 | BIM technology and target optimization-based cooling tower noise reduction design method |
| CN117890478A (en) * | 2024-01-09 | 2024-04-16 | 上海申华声学装备有限公司 | Device for testing noise reduction material |
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Application publication date: 20150128 |