CN204154140U - Cooling stack noise elimination structure - Google Patents
Cooling stack noise elimination structure Download PDFInfo
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- CN204154140U CN204154140U CN201420590722.2U CN201420590722U CN204154140U CN 204154140 U CN204154140 U CN 204154140U CN 201420590722 U CN201420590722 U CN 201420590722U CN 204154140 U CN204154140 U CN 204154140U
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Abstract
The utility model discloses a kind of cooling stack noise elimination structure, by outer acoustic barrier, cascade arrangement sound insulation sound absorber and install support steel structure form.Outer acoustic barrier system is arranged on the outer ground of cooling tower air inlet, the sound insulation sound absorber of cascade arrangement is arranged between cooling tower air inlet and outer acoustic barrier, the concentric circles arc that the sound insulation sound absorber of outer acoustic barrier, cascade arrangement is is the center of circle with cooling stack center; The sound insulation sound absorber of cascade arrangement be two layers or layer.Described outer acoustic barrier and cooling tower air inlet plan vertical distance are 1.1 ~ 1.3 times of cooling tower air inlet height, the height of outer acoustic barrier is 0.5 ~ 0.7 times of cooling tower air inlet height, outer acoustic barrier is made up of brick mix structure, installs inorganic acoustic board in the screen body by cooling tower air inlet direction.Do not affect the blast of cooling tower, the noise control method of wind loss, meanwhile, economy and durability defening effect is good.
Description
Technical field
The utility model relates to the technical field of Noise measarement, particularly relates to one and can eliminate the airborne cooling stack noise elimination structure of large-scale natural draft counter-flow wet cooling tower noise.
Background technology
In power plant, natural draft counter-flow wet cooling tower trickle noise becomes important noise source, and because the location comparison of some power plant is special, cooling tower distance residential block is comparatively near, the daily life that have impact on resident that cooling tower buzz is serious.
Natural ventilating wet-type counter-flow cooling tower is current domestic application the most a kind of cooling tower form, natural draft counter-flow wet cooling tower noise belongs to medium-high frequency, high-strength, steady-state noise, derives from tower the overboard large area continuity to Chi Shui of the high density being equivalent to storm intensity decades of times and directly clashes into.Because its sound source is huge, acoustic power level strong, the decay of bandwidth, medium and low frequency is little, propagation distance far away, and coverage reaches hundreds of rice.The coverage of cooling tower falling water noise: the sound source of falling water noise is the built-in circular water surface of a slice, in cavity, sound wave is outwards propagated by air inlet, so air inlet can be considered as sound source edge, its huge special cambered surface outlet sound mouth makes the sound wave in " near zone " not decay by the spatial attenuating tendency of " point sound source " immediately, a transitional region by " area source of sound " (sound wave is unattenuated) and the spatial attenuating tendency to " line source " (distance often double sound energy attenuation 3 db) is there is in this " near zone " from the close-by examples to those far off, only have when moving to the rear that the circular air inlet mouth of cooling tower can be considered as beyond " point " by outside sound point (measuring point), sound wave just starts to decay by the spatial attenuating tendency of " point sound source ".
For the genesis mechanism of cooling tower buzz, that circulation way can be summed up as three approach improvement cooling tower buzz is basic;
One, the sound source in cooling tower is administered: in tower, the Treatment process of sound source is undoubtedly a kind of way of effecting a permanent cure of Be very effective.But up to the present, in tower, the Treatment process of sound source not yet has successful case study on implementation, whether the safe operation for cooling tower can have an impact and remain uncertainty.
Two, wave absorption (along journey decay): wave absorption (along journey decay) is exactly arrange gear sound slight slope and arrange greenbelt between cooling tower and residential block, to absorb cooling tower buzz.If the plantation alternate not Deciduous tree of height and shrub form dense greenbelt, every meter can be reduced noise 1-2 dB(A).But noise reduction is lower, meanwhile, because noise reduction depends on the growing state of greenbelt, also there is uncertain factor.
Three, the sound wave in the outer transaudient approach of cooling tower intercepts (sound insulation, sound absorption): 1, arrange large-scale dissipative muffler at cooling tower air inlet, large-scale dissipative muffler is arranged on outside air inlet, closes, can meet the object of noise elimination between silencer top and tower body.Because the spacing between the soundproof effect of dissipative muffler and anechoic sheet is closely related, spacing between anechoic sheet is too large, and do not have soundproof effect, the spacing between anechoic sheet is too little, the air loss produced can cause reducing ventilation in tower, seriously reduces its cooling effectiveness.Because the cost of large-scale dissipative muffler is high, have impact on it and apply.Meanwhile, dissipative muffler is arranged at outdoor environment, also creates higher maintenance cost of use.2, acoustic barrier is set outside cooling tower, at cooling tower air inlet outer ground rational height higher than the sound insulation absorbent lined barrier of cooling tower air inlet, to intercept the route of transmission of cooling tower buzz, residential block is placed in the acoustic shadow of acoustic barrier.
Cooling stack carries out the cooling tower ventilated by the cross-ventilation effect that the atmospheric density difference inside and outside tower or natural wind are formed.In order to ensure cooling stack intake volume, cooling tower air inlet is general all higher, and air intake effective area is large.If reach shield effectiveness, acoustic barrier should higher than cooling tower air inlet height, and in order to prevent the loss caused blast, the path of air intake is better wider.Distance between the height of acoustic barrier and cooling tower air inlet forms a pair paradox mutually restricted.Acoustic barrier is higher, and better, the distance between acoustic barrier and cooling tower air inlet is far away, and the more, shield effectiveness is poorer for diffraction sound wave for shield effectiveness.
Meanwhile, higher acoustic barrier, puts forward higher requirement to acoustic barrier structures under wind pressure, and cost is also just high.
Summary of the invention
The purpose of this utility model is to provide the outer sound wave of a kind of tower to intercept, staged acoustic screen is set, shortens air intake air flow path, reduce air loss, effectively can eliminate the noise control method of cooling tower airborne noise transmission, be economy and durability, cooling stack noise elimination structure that defening effect is good.
The utility model solves the technical scheme that its technical problem adopts: a kind of cooling stack noise elimination structure, by outer acoustic barrier, cascade arrangement sound insulation sound absorber and support steel structure be installed form.Outer acoustic barrier is arranged on the ground in cooling tower air inlet direction, the sound insulation sound absorber of cascade arrangement is arranged between cooling tower air inlet and outer acoustic barrier, the concentric circles arcuation that the shape of the sound insulation sound absorber of outer acoustic barrier, cascade arrangement is is the center of circle with cooling stack center; The sound insulation sound absorber of cascade arrangement is two layers or multilayer.
Sound wave runs into the diffraction phenomenon that barrier occurs can weaken the sound insulation effect of sound barrier, and diffracting power is relevant with sound wave frequency, so the relation of the noise reduction of sound barrier and sound wave frequency and wavelength is very large.Sound barrier shielding action that is short for wavelength, the not easily high frequency waves of diffraction is very remarkable, can form very long acoustic shadow after barrier; For wavelength, there is very strong diffracting power the shielding action of low frequency wave then very limited.Diffraction sound wave can be weakened on the impact by sound point by the way of the sound insulation sound absorber arranging cascade arrangement, because the frequency spectrum of cooling tower falling water noise is based on high frequency components, thus adopt the sound insulation sound absorber of cascade arrangement to cut off and absorb cooling tower sound source arrive can obtain more than 20 dB(A by the direct sound wave of sound point) noise reduction.
Described outer acoustic barrier and cooling tower air inlet plan vertical distance are 1.1 ~ 1.3 times of cooling tower air inlet height, the height of outer acoustic barrier is 0.5 ~ 0.7 times of cooling tower air inlet height, outer acoustic barrier is made up of brick mix structure, installs inorganic acoustic board in the screen body by cooling tower air inlet direction.The sound insulation sound absorber of described cascade arrangement is arranged on support steel structure, inside establishes inorganic acoustic board, peripheral hardware decoration armour layer.
Reduce the height of outer acoustic barrier, brick mix structure can be used to make, greatly can reduce setup cost, improve the weatherability of acoustic barrier, increase the service life.The height of outer acoustic barrier and the height at cooling tower air inlet top closely related, also relevant with the number of plies of the sound insulation sound absorber of cascade arrangement.Because the hole wind-loading resistance of single-layer of brick-concrete structure is limited, the height of outer acoustic barrier is too high, just should not use brick mix structure.So the height when cooling tower air inlet top exceeds certain limit (more than 10m), the number of plies of the sound insulation sound absorber of cascade arrangement will be increased, to reduce the height of outer acoustic barrier.The number of plies of the sound insulation sound absorber of cascade arrangement the more, soundproof effect better, but setup cost is also just high.Design should be determined as the case may be.Meanwhile, according to cooling tower buzz influence area, the noise elimination structure of complete circle can be set, also can setting unit circular arc noise elimination structure.
The head tree of support steel structure is 200#H shaped steel (200 × 200 × 8 × 12 mm), and column bottom arranges flange bottom plate and ribbed stiffener, arranges concreting pedestal, and mattess uses chemical bolt bar planting, and flange bottom plate and concrete pedestal are fastenedly connected.Use 150#H shaped steel and alloytype steel horizontal cross thereof, longitudinal direction and the tiltedly reliable welding of fork between 200#H shaped steel, between arrange and strengthen node steel plate, ensure the ant wind load ability of support steel structure.Steel structure surface does two road red lead primers, the application of two coat finish antirust, anti-corrosive.Circular arc sound insulation sound absorber is connected with using bolt between support steel structure.
When the sound insulation sound absorber of described cascade arrangement is two layers, the height of outer sound insulation sound absorber is 0.5 times of cooling tower air inlet height, being vertically mounted on outer acoustic barrier vertical range is the position of cooling tower air inlet height 0.4 times, and the height on distance from bottom ground is 0.4 times of cooling tower air inlet height; It is the position of cooling tower air inlet height 0.8 times that interior sound insulation sound absorber is arranged on outer acoustic barrier vertical range, the height on distance from bottom ground is 0.65 times of cooling tower air inlet height, the height of interior sound insulation sound absorber is 0.5 times of cooling tower air inlet height, wherein, the latter half is vertical body, the first half has certain knuckle toward cooling tower direction, and knuckle angle is consistent with air inlet riser angle.
When the sound insulation sound absorber of described cascade arrangement is three layers, the height of outer sound insulation sound absorber is 0.5 times of cooling tower air inlet height, being vertically mounted on outer acoustic barrier vertical range is the position of cooling tower air inlet height 0.3 times, and the height on distance from bottom ground is 0.3 times of cooling tower air inlet height; The height of middle sound insulation sound absorber is 0.5 times of cooling tower air inlet height, and it is the position of cooling tower air inlet height 0.6 times that middle sound insulation sound absorber is arranged on outer acoustic barrier vertical range, and the height on distance from bottom ground is 0.5 times of cooling tower air inlet height; It is the position of cooling tower air inlet height 0.9 times that interior sound insulation sound absorber is arranged on outer acoustic barrier vertical range, the height on distance from bottom ground is 0.65 times of cooling tower air inlet height, the height of interior sound insulation sound absorber is 0.4 times of cooling tower air inlet height, wherein, the latter half is vertical body, the first half has certain knuckle toward cooling tower direction, and knuckle angle is consistent with air inlet riser angle.
Natural ventilating wet-type counter-flow cooling tower is current domestic application the most a kind of cooling tower form, its thermal performance is larger by such environmental effects, especially ambient side wind action makes tower circumference air intake extremely uneven, reduces ventilation in tower, seriously reduces its cooling effectiveness.And the sound insulation sound absorber of outer acoustic barrier, cascade arrangement is installed around cooling tower air inlet, both can shorten air intake air flow path, and reduce air loss, meanwhile, the adverse effect that crosswind brings can be alleviated, ensure the cooling effectiveness of cooling tower.
Described inorganic acoustic board has the inorganic porous sound-absorbing material of steel wire to make by interior, and described inorganic porous sound-absorbing material is expanded perlite granule, sound absorption haydite, expanded vermiculite or foaming sound absorption cement.Inorganic acoustic board has good acoustically effective, can absorb the noise of gas outlet.Meanwhile, be easy to machine-shaping, without the need to arranging armour layer, cheap.There is steel wire can meet the requirement of strength of inorganic acoustic board in inorganic acoustic board.For easy to operate, outside sound insulation daylighting observation window can be set acoustic barrier, just equipment working condition can be understood through sound insulation daylighting observation window outward at sound barrier, reduce noise of equipment to the impact of operating personnel, the daylighting meeting working face is observed, and is beneficial to administrative staff to the operation of cooling tower systems, maintenance.
When arranging the noise elimination structure of complete circle, being the turnover of operating personnel, outside soundproof door can being set acoustic barrier.Under outer acoustic barrier ties up to open-air conditions, sealing joint strip, the door closer weatherability difference of passage soundproof door are easily damaged, therefore arrange and safeguard the access way of noise elimination sound lock as operating personnel.Described maintenance noise elimination sound lock is closed construction, arranges sound absorption structure inside sound lock, and the import and export of sound lock arranges transparent sound insulation and holds court from behind a screen.
The beneficial effects of the utility model are: 1, air intake blast, wind loss are little, do not affect the design intake of cooling tower.2, cost is low, good weatherability, economical and practical.3, the Be very effective of cooling tower airborne noise transmission is eliminated.4, cooling tower is facilitated to safeguard.
Below in conjunction with drawings and Examples to the utility model further instruction.
Accompanying drawing explanation
Fig. 1 is the side, sectional structural map of the utility model first embodiment.
Fig. 2 is the top view of Fig. 1.
Fig. 3 is the side, sectional structural map of the utility model second embodiment.
Fig. 4 is the top view of Fig. 3.
1. outer acoustic barriers in figure, 2. insulate against sound sound absorber, 3. support steel structure, 4. cooling tower air inlet, 5. ground, 6. cooling tower, 7. inorganic acoustic board, 8. decorates armour layer, 9. brick mix structure.
Detailed description of the invention
In the embodiment of first shown in Fig. 1,2, a kind of cooling stack noise elimination structure, by outer acoustic barrier (1), cascade arrangement sound insulation sound absorber (2) and install support steel structure (3) form.Outer acoustic barrier (1) is arranged on the ground (5) in cooling tower air inlet (4) direction, the sound insulation sound absorber (2) of cascade arrangement is arranged between cooling tower air inlet (4) and outer acoustic barrier (1), and the shape of the sound insulation sound absorber (2) of outer acoustic barrier (1), cascade arrangement take cooling stack (6) center as the concentric circles arcuation in the center of circle; The sound insulation sound absorber (2) of cascade arrangement is two layers or multilayer.Described outer acoustic barrier (1) and cooling tower air inlet (4) plan vertical distance are 1.1 ~ 1.3 times of cooling tower air inlet (4) height, the height of outer acoustic barrier (1) is 0.5 ~ 0.7 times of cooling tower air inlet (4) height, outer acoustic barrier (1) is made up of brick mix structure (9), by installing inorganic acoustic board (7) in the screen body in cooling tower air inlet (4) direction.The sound insulation sound absorber (2) of described cascade arrangement is arranged on support steel structure (3), inside establishes inorganic acoustic board (7), peripheral hardware decoration armour layer (8).
When the sound insulation sound absorber (2) of described cascade arrangement is two layers, the height of outer sound insulation sound absorber (2) is 0.5 times of cooling tower air inlet (4) height, being vertically mounted on outer acoustic barrier (1) vertical range is cooling tower air inlet (4) the height position of 0.4 times, and the height on distance from bottom ground is 0.4 times of cooling tower air inlet (4) height; It is cooling tower air inlet (4) the height position of 0.8 times that interior sound insulation sound absorber (2) is arranged on outer acoustic barrier (1) vertical range, the height on distance from bottom ground (5) is 0.65 times of cooling tower air inlet (4) height, the height of interior sound insulation sound absorber (2) is 0.5 times of cooling tower air inlet (4) height, wherein, the latter half is vertical body, the first half has certain knuckle toward cooling tower (6) direction, and knuckle angle is consistent with air inlet riser angle.
In the embodiment of second shown in Fig. 3,4, when the sound insulation sound absorber (2) of described cascade arrangement is three layers, the height of outer sound insulation sound absorber (2) is 0.5 times of cooling tower air inlet (4) height, being vertically mounted on outer acoustic barrier (1) vertical range is cooling tower air inlet (4) the height position of 0.3 times, and the height of distance from bottom ground (5) is 0.3 times of cooling tower air inlet (4) height; The height of middle sound insulation sound absorber (2) is 0.5 times of cooling tower air inlet (4) height, it is cooling tower air inlet (4) the height position of 0.6 times that middle sound insulation sound absorber (2) is arranged on outer acoustic barrier (1) vertical range, and the height of distance from bottom ground (5) is 0.5 times of cooling tower air inlet (4) height; It is cooling tower air inlet (4) the height position of 0.9 times that interior sound insulation sound absorber (2) is arranged on outer acoustic barrier (1) vertical range, the height on distance from bottom ground (5) is 0.65 times of cooling tower air inlet (4) height, the height of interior sound insulation sound absorber (2) is 0.4 times of cooling tower air inlet (4) height, wherein, the latter half is vertical body, the first half has certain knuckle toward cooling tower (6) direction, and knuckle angle is consistent with air inlet riser angle.
Described inorganic acoustic board (7) has the inorganic porous sound-absorbing material of steel wire to make by interior, and described inorganic porous sound-absorbing material is expanded perlite granule, sound absorption haydite, expanded vermiculite or hole-opening foaming sound absorption cement.
Should be appreciated that not departing from scope of the present utility model, multiple change can be made to above-described embodiment, and being applied to other occasions.All do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (6)
1.
a kind of cooling stack noise elimination structure, by outer acoustic barrier, cascade arrangement sound insulation sound absorber and install support steel structure form, it is characterized in that: outer acoustic barrier is arranged on the ground in cooling tower air inlet direction, the sound insulation sound absorber of cascade arrangement is arranged between cooling tower air inlet and outer acoustic barrier, the concentric circles arcuation that the shape of the sound insulation sound absorber of outer acoustic barrier, cascade arrangement is is the center of circle with cooling stack center; The sound insulation sound absorber of cascade arrangement is two layers or multilayer.
2.
cooling stack noise elimination structure according to claim 1, it is characterized in that: described outer acoustic barrier and cooling tower air inlet plan vertical distance are 1.1 ~ 1.3 times of cooling tower air inlet height, the height of outer acoustic barrier is 0.5 ~ 0.7 times of cooling tower air inlet height, outer acoustic barrier is made up of brick mix structure, installs inorganic acoustic board in the screen body by cooling tower air inlet direction.
3.
cooling stack noise elimination structure according to claim 1, is characterized in that: the sound insulation sound absorber of described cascade arrangement is arranged on support steel structure, inside establishes inorganic acoustic board, peripheral hardware decoration armour layer.
4.
cooling stack noise elimination structure according to claim 1, it is characterized in that: when the sound insulation sound absorber of described cascade arrangement is two layers, the height of outer sound insulation sound absorber is 0.5 times of cooling tower air inlet height, being vertically mounted on outer acoustic barrier vertical range is the position of cooling tower air inlet height 0.4 times, and the height on distance from bottom ground is 0.4 times of cooling tower air inlet height; It is the position of cooling tower air inlet height 0.8 times that interior sound insulation sound absorber is arranged on outer acoustic barrier vertical range, the height on distance from bottom ground is 0.65 times of cooling tower air inlet height, the height of interior sound insulation sound absorber is 0.5 times of cooling tower air inlet height, wherein, the latter half is vertical body, the first half has certain knuckle toward cooling tower direction, and knuckle angle is consistent with air inlet riser angle.
5.
cooling stack noise elimination structure according to claim 1, it is characterized in that: when the sound insulation sound absorber of described cascade arrangement is three layers, the height of outer sound insulation sound absorber is 0.5 times of cooling tower air inlet height, being vertically mounted on outer acoustic barrier vertical range is the position of cooling tower air inlet height 0.3 times, and the height on distance from bottom ground is 0.3 times of cooling tower air inlet height; The height of middle sound insulation sound absorber is 0.5 times of cooling tower air inlet height, and it is the position of cooling tower air inlet height 0.6 times that middle sound insulation sound absorber is arranged on outer acoustic barrier vertical range, and the height on distance from bottom ground is 0.5 times of cooling tower air inlet height; It is the position of cooling tower air inlet height 0.9 times that interior sound insulation sound absorber is arranged on outer acoustic barrier vertical range, the height on distance from bottom ground is 0.65 times of cooling tower air inlet height, the height of interior sound insulation sound absorber is 0.4 times of cooling tower air inlet height, wherein, the latter half is vertical body, the first half has certain knuckle toward cooling tower direction, and knuckle angle is consistent with air inlet riser angle.
6.
cooling stack noise elimination structure according to claim 2, it is characterized in that: described inorganic acoustic board has the inorganic porous sound-absorbing material of steel wire to make by interior, described inorganic porous sound-absorbing material is expanded perlite granule, sound absorption haydite, expanded vermiculite or hole-opening foaming sound absorption cement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420590722.2U CN204154140U (en) | 2014-10-14 | 2014-10-14 | Cooling stack noise elimination structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420590722.2U CN204154140U (en) | 2014-10-14 | 2014-10-14 | Cooling stack noise elimination structure |
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| CN204154140U true CN204154140U (en) | 2015-02-11 |
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| CN201420590722.2U Expired - Fee Related CN204154140U (en) | 2014-10-14 | 2014-10-14 | Cooling stack noise elimination structure |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105571345A (en) * | 2014-10-14 | 2016-05-11 | 厦门嘉达环保建造工程有限公司 | Noise eliminating structure of natural ventilation cooling tower |
| CN107084628A (en) * | 2016-02-15 | 2017-08-22 | 厦门嘉达环保建造工程有限公司 | Hyperbolic cooling tower sound-attenuating system |
| CN107225367A (en) * | 2017-04-29 | 2017-10-03 | 广州览讯科技开发有限公司 | The manufacture craft and making apparatus of silencer section bar |
| CN110132028A (en) * | 2018-02-08 | 2019-08-16 | 厦门嘉达环保科技有限公司 | The anti-icing noise reduction system of double-curve cooling column radix saposhnikoviae |
| CN113793584A (en) * | 2021-09-08 | 2021-12-14 | 广东电网有限责任公司 | Noise reduction device for power equipment |
-
2014
- 2014-10-14 CN CN201420590722.2U patent/CN204154140U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105571345A (en) * | 2014-10-14 | 2016-05-11 | 厦门嘉达环保建造工程有限公司 | Noise eliminating structure of natural ventilation cooling tower |
| CN105571345B (en) * | 2014-10-14 | 2018-04-20 | 厦门嘉达环保建造工程有限公司 | Cooling stack noise elimination structure |
| CN107084628A (en) * | 2016-02-15 | 2017-08-22 | 厦门嘉达环保建造工程有限公司 | Hyperbolic cooling tower sound-attenuating system |
| WO2017139968A1 (en) * | 2016-02-15 | 2017-08-24 | 厦门嘉达环保建造工程有限公司 | Hyperbolic cooling tower noise-attenuating system |
| CN107084628B (en) * | 2016-02-15 | 2019-07-26 | 厦门嘉达环保科技有限公司 | Hyperbolic cooling tower sound-attenuating system |
| CN107225367A (en) * | 2017-04-29 | 2017-10-03 | 广州览讯科技开发有限公司 | The manufacture craft and making apparatus of silencer section bar |
| CN110132028A (en) * | 2018-02-08 | 2019-08-16 | 厦门嘉达环保科技有限公司 | The anti-icing noise reduction system of double-curve cooling column radix saposhnikoviae |
| CN110132028B (en) * | 2018-02-08 | 2024-06-04 | 厦门嘉达环保科技有限公司 | Wind-proof anti-icing noise reduction system of hyperbolic cooling tower |
| CN113793584A (en) * | 2021-09-08 | 2021-12-14 | 广东电网有限责任公司 | Noise reduction device for power equipment |
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