WO2017139968A1

WO2017139968A1 - Hyperbolic cooling tower noise-attenuating system

Info

Publication number: WO2017139968A1
Application number: PCT/CN2016/074119
Authority: WO
Inventors: 林嘉祥
Original assignee: 厦门嘉达环保建造工程有限公司
Priority date: 2016-02-15
Filing date: 2016-02-19
Publication date: 2017-08-24
Also published as: CN107084628B; CN107084628A

Abstract

Provided is a hyperbolic cooling tower noise-attenuating system comprising a decorative sound absorption module (1), a lighting observation module (2), an installation support structure (3), a modular installation fastening structure (4), and a maintenance channel (5). The decorative sound absorption module (1) has uniform specifications, and comprises a steel framework (11), an interior sound absorption face, an exterior sound insulation decorative face, elastic vibration isolation tape (12), and an upper mounting eyebolt (13). The lighting observation module (2) comprises a steel structure framework (21), an interior vibration isolating mounting member (22), a sound insulating glass panel (23), and an exterior vibration isolating positioning member (24). Further, the external specifications and configuration of the lighting observation module (2) are consistent with those of the decorative sound absorption module (1); the mounting support structure (3) is composed of a load-bearing steel structure (31), a concrete base (32), and a waterproof wall (33); and the modular installation fastening structure (4) is composed of a groove-shaped steel section (41) at the bottom of the decorative sound absorption module (1), an L-shaped steel section (43) of an adjustable fastener (42) at the top of the decorative sound absorption module (1), and a supporting steel section (44) supporting the middle part of the decorative sound absorption module (1). The groove-shaped steel section (41) is installed with a fastening bolt (45) on its inner side, and is provided with a drainage hole (46) at the bottom.

Description

Hyperbolic cooling tower noise reduction system

Technical field

The invention relates to the technical field of noise control, in particular to a hyperbolic cooling tower muffling system capable of eliminating noise air propagation of a large hyperbolic natural ventilation countercurrent wet cooling tower.

Background technique

The hyperbolic natural ventilation wet counterflow cooling tower is a cooling tower form of the current power plant. The natural ventilation countercurrent wet cooling tower noise belongs to medium and high frequency, high intensity and steady state noise, and is derived from the high density water falling in the tower which is equivalent to ten times of the intensity of the rainstorm. A direct impact on the large area of the pool water. Due to its large sound source and strong sound power level, the frequency bandwidth and propagation distance are far, and the range of influence is several hundred meters. In power plants, natural ventilation countercurrent wet cooling towers are an important source of noise. Due to the special location of some power plants, the cooling tower is closer to the residential area, and the noise of the cooling tower has seriously affected the daily life of the residents.

A naturally ventilated cooling tower is a cooling tower that ventilates the air convection caused by a difference in air density inside or outside the tower or by natural wind. In order to ensure the air volume of the natural ventilation cooling tower, the air inlet of the cooling tower is generally high, and the effective area of the air inlet is large. If the shielding effect is to be achieved, the sound insulation barrier should be higher than the height of the air inlet of the cooling tower. In order to prevent the loss of wind pressure, the shorter the path of the air inlet, the better. The distance between the height of the sound insulation barrier and the air inlet of the cooling tower forms a pair of mutually contradictory contradictions. The higher the sound barrier is, the better the shielding effect is. The farther the distance between the sound barrier and the air inlet of the cooling tower is, the more the sound waves are diffracted, and the shielding effect is worse. At the same time, the higher the sound insulation barrier, the higher the requirements for the wind pressure resistance of the sound insulation barrier structure, and the higher the construction cost.

Summary of the invention

The object of the present invention is to provide a sound wave barrier outside the tower, and to provide a stepped sound insulation screen, shorten the air flow path and reduce the wind pressure loss, and effectively eliminate the water falling noise of the hyperbolic cooling tower from the air inlet, using the module. Cooling tower noise reduction system with low cost, high construction speed, good weather resistance, good landscape effect and economical and practical.

The technical solution adopted by the present invention to solve the technical problem thereof is: a hyperbolic cooling tower muffling system, which is composed of a decorative sound absorbing module, an observation lighting module, a mounting support structure, a module installation fastening structure and a maintenance channel, The decorative sound absorbing module has uniform specifications, and is composed of a steel structure frame, an inner sound absorbing surface, an outer sound insulation decorative surface, an elastic vibration isolation rubber strip and a top mounting hoist ring; the observation lighting module is installed by a steel structure frame and internal vibration isolation. The component, the sound insulating glass and the external vibration isolation positioning component are composed, and the outer shape specification and the configuration are consistent with the decorative sound absorbing module; the installation supporting structure is composed of a bearing steel structure, a concrete base and a waterproof partition wall; the module installation The fastening structure is composed of a groove-shaped steel plate with a decorative sound-absorbing module at the bottom, an L-shaped steel with an upper decorative sound-absorbing module installed with a snap-type adjustable fastener, and a supporting steel with a central supporting decorative sound-absorbing module. The grooved steel is fitted with fastening bolts on the inner side and a drain hole on the bottom.

Due to the high level of the sound barrier of the hyperbolic cooling tower noise reduction system, the windward area is large. Therefore, the wind load capacity of the sound insulation barrier has become the top priority of the noise reduction system design. According to the seismic performance of the sound insulation barrier and the local maximum wind load and snow load model calculation, the steel structure and basic design scheme of the sound insulation barrier are determined. The main column supporting the steel structure is H-shaped steel, the lower part of the column is provided with a flange bottom plate and stiffeners, a concrete pouring base is arranged, the concrete floor is made of chemical bolts, and the flange bottom plate is fastened with the concrete base. H-beams are welded with horizontal, longitudinal and oblique forks of other steels. Reinforced joint steel plates are installed to ensure the wind load capacity of the supporting steel structures. The surface of the steel structure is made of two anti-rust primers and two coats of anti-corrosion coating.

The module installation fastening structure is installed on the bearing steel structure, and the plurality of decorative sound absorbing modules are vertically installed outside the cooling tower to form a curved sound insulation barrier centered on the cooling tower, and the curved sound insulation barrier has multiple layers and the outer layer is arranged. On the waterproof partition wall, the inner layer is arranged outside the top of the air inlet of the cooling tower, and the two layers of arc-shaped sound insulation barriers are horizontally overlapped to form a stepped multi-layer curved sound insulation barrier with an outer low inner high shape; hyperbolic cooling The tower is currently the most widely used type of cooling tower in domestic power plants, but its thermal performance is greatly affected by environmental factors, especially the effect of environmental crosswinds makes the circumferential wind in the tower extremely uneven, reducing the amount of ventilation inside the tower. Reduced its cooling efficiency. Since the spectrum of the cooling tower falling water noise is mainly composed of medium and high frequency components, the effect of the diffracted sound waves on the sound receiving point can be weakened by providing a stepped arrangement of the sound absorbing sound absorbers, so that the sound absorbing sound bodies are arranged in a stepped manner. A good noise reduction effect can be obtained by blocking and absorbing the direct sound waves from the cooling tower sound source to the sound receiving point. It can shorten the airflow path and avoid the adverse effects caused by the crosswind. It can stabilize the flow velocity of the intake air and minimize the pressure loss of the airflow.

The influence range of the cooling tower falling water noise: the sound source of the falling water noise is a built-in circular water surface, and the sound waves in the cavity propagate outward through the air inlet, so the air inlet can be regarded as the edge of the sound source, and its huge special curved surface sounds. The mouth makes the sound waves in the "near area" not immediately attenuate according to the distance attenuation of the "point sound source". In this near and far "near area", there is a outward diffusion of the circular cylindrical wave. As the propagation distance increases, the sound pressure level decreases due to the dispersion of energy. The sound pressure directly radiated by the sound source is inversely proportional to the distance from the sound source. The sound source on the ground (the so-called semi-free sound field) is one meter away from the sound source, and the distance is increased by 3 times (A). If the maximum noise level of 1m outside the inlet sump is 88dB(A), the noise level attenuation can be estimated as follows, without considering the air and ground absorption factors.

The maximum noise level of 3m (plus 2m) outside the edge of the air inlet is 85dB (A);

The maximum noise level of 7m (plus 4m) outside the edge of the air inlet is 82dB (A);

The maximum noise level of 15m (plus 8m) outside the edge of the air inlet is 79dB (A);

The maximum noise level of 31m (plus 16m) outside the edge of the air inlet is 76dB (A);

The maximum noise level of 63m (plus 32m) outside the edge of the air inlet is 73dB (A);

The maximum noise level of 127m (plus 64m) outside the edge of the air inlet is 70dB (A);

The maximum noise level of 255m (plus 128m) outside the edge of the air inlet is 67dB (A).

The above estimate is based on the noise propagating through the air inlet closest to the noise sensitive point. Since the air inlet at the bottom of the large hyperbolic cooling tower is about 100 m in diameter, the noise propagated at the end of the inlet vent radius increases the attenuation distance by 50 m from the nearest air inlet. If a sound barrier is set, the attenuation is even greater for noise sensitive points. At present, a sound barrier higher than the air inlet of the cooling tower is arranged on the ground outside the air inlet of the cooling tower to block the transmission path of the noise of the cooling tower, and the residential area is placed in the sound shadow area of the sound insulation barrier.

If the noise sensitive point is only in a certain direction outside the cooling tower, the farther the air inlet of the cooling tower side is from the noise sensitive point in the direction, the smaller the influence of noise, the corresponding reduction of the noise reduction requirement. According to the equivalent noise elimination principle, the number of layers of the stepped arc sound insulation barrier is correspondingly reduced according to the requirements of the sound elimination. It can reduce the amount of engineering and save engineering investment while satisfying the amount of noise reduction. In the position where the air inlet of the cooling tower is gradually away from the noise sensitive point, the number of the stepped arc sound insulation barrier is in the order of the innermost layer, the middle inner layer, the second outer layer, the inner inner layer, the middle outer layer, and the outermost layer. Decrease in number. The innermost arc-shaped sound insulation barrier mainly blocks the water falling noise of the cooling tower from entering the upper space toward the top of the air inlet. Since the cooling tower falling water noise belongs to the middle and high frequency, the sounding ability of the sound wave is relatively weak. First, reducing the innermost arc-shaped sound insulation barrier has less influence on the noise reduction. Reducing the middle inner layer, the inner inner layer and the middle outer layer can still block the horizontal propagation of the falling water noise; reducing the sub-outer layer, the outermost layer and the middle outer layer can still block the horizontal propagation of the falling water noise; reduce the sub-inner layer, The inner layer can still block the horizontal propagation of the falling water noise; reduce the middle outer layer, the outermost layer can still block the reflection of the falling water noise and the ground, destroy the formation of the semi-free sound field, and increase the attenuation of the noise level with the distance. Amplitude.

The decorative sound absorbing module is composed of a steel structure frame and an outer decorative steel plate, and the decorative steel plate is fixed on the side of the steel structure frame, and the decorative steel plate is coated with a soundproof damping slurry to form an acoustic decorative surface; the inner sound absorbing surface is handed from the inside to the outside. The second is a sound absorbing material, a waterproof sound-permeable film, and a louver-type perforated plate; respectively, an elastic vibration-isolating strip is disposed on the inner side and the bottom of the steel structure frame; a gap of about 10 mm is reserved between the vertically-mounted decorative sound-absorbing modules, and the structural adhesive is used. Closed; decorative sound-absorbing module consists of galvanized square tube inner frame, externally laid decorative steel plate, decorative steel plate folded edge, fixed with rivets in the inner frame of galvanized square tube. The outer surface of the decorative sound absorbing module forms a decorative effect similar to that of the aluminum composite panel. The decorative steel plate has low cost and strong weather resistance, and the color and the environment color are coordinated, which is beneficial to improving the landscape effect of the cooling tower noise reduction system.

Since the cooling tower noise elimination system is a multi-layer concentric shape with the center of the cooling tower as the center, the decorative sound absorbing module is a planar structure, and the plurality of decorative sound absorbing modules are arranged along a circular arc shape, which does not hinder the landscape effect. However, the multi-layer concentric shape will produce inconsistent curvature of each concentric shape, and the more the inner layer, the greater the curvature. In order to improve the construction efficiency, the width of the effective groove in the groove-shaped steel required for the maximum curvature of the inner layer is used as the groove-shaped steel of all module mounting structures. For the lesser curvature, the fastening of the decorative sound absorbing module is ensured by the fastening bolts on the inner side of the channel-shaped steel to ensure the firmness of the installation. Use slotted steel and The installation of snap-on adjustable fasteners makes the installation fast and efficient, effectively improving the installation work efficiency and reducing the installation cost.

The inner vibration isolation mounting member of the observation lighting module is installed inside the steel structure frame, the sound insulation glass is installed on the inner vibration isolation installation member, the outer vibration isolation positioning member is installed outside the sound insulation glass, and the light collection module is installed at intervals. The waterproof partition wall in the arc-shaped sound insulation barrier; outside the sound barrier, the sound insulation glass can be used to observe the working condition of the equipment, reduce the influence of equipment noise on the operator, and meet the lighting observation of the working surface to facilitate management. Operation and maintenance of the cooling tower system. The module mounting structure is installed on the ground waterproof partition wall to ensure that the bottom of the decorative sound absorbing module is protected from rain and corrosion, and at the same time, it is used as an anti-collision measure for the air cooling tower noise reduction system.

The maintenance passage is disposed in the middle of the outer arc-shaped sound insulation barrier, and the second layer of the curved sound insulation barrier facing the maintenance passage extends to the waterproof partition wall, and the width of the extension portion of the second layer of the sound insulation barrier is greater than the maintenance Three times the width of the channel. Set the maintenance channel as the operator's access path. The width is three times the width of the channel frame. It acts as a sound barrier to prevent sound waves from propagating through the maintenance channel.

The louver perforated plate is installed with an opening downward facing the direction of the sound source. Because the sound source of the hyperbolic natural ventilation wet counterflow cooling tower is mainly the sound of falling water, the direction of the sound source is in the pool at the lower part of the cooling tower, and the louver type perforated plate with the opening downward is favorable for absorbing the sound of falling water, and at the same time, effectively preventing the rain to the sound absorbing material. The invasion ensures the weather resistance of the decorative sound absorbing module and prolongs the service life.

The enveloping surface of the arc-shaped sound insulation barrier is determined according to the position of the noise sensitive point, and the layer number, the spacing of the arc-shaped sound insulation barrier, and the horizontal overlapping proportion of the two-layer arc-shaped sound insulation barrier are determined according to the requirements of the noise reduction noise reduction amount. The surrounding surface of the arc-shaped sound insulation barrier is determined according to the position of the noise sensitive point, and the spacing between the two-layer curved sound insulation barrier and the horizontal overlapping ratio of the two-layer curved sound insulation barrier are determined according to the requirements of the noise reduction and noise reduction. . According to the noise affected area of the cooling tower, a complete circular muffling structure or a partial arc-shaped muffling structure may be provided. The smaller the spacing between the two-layer arc-shaped sound barriers, the more horizontal overlap ratio of the two-layer arc-shaped sound barriers, and the thicker the sound-absorbing materials, the greater the noise reduction.

When the noise reduction and noise reduction requirements are high, the decorative steel plate surfaces of the two decorative sound absorbing modules are bonded to form a composite sound insulation sound absorbing module, and the arc sound insulation barrier installed inside the outer layer forms a double-sided sound absorption. Sound inserts. Double-sided sound absorption can reduce the reflected sound wave of the sound insulation decorative surface, which can greatly improve the noise reduction of the noise reduction system and meet the requirements of high noise reduction and noise reduction.

The beneficial effects of the present invention over the prior art are:

1. The stepped multi-layer arc-shaped sound insulation barrier with low outer and inner high shape can effectively eliminate the falling water noise transmitted from the air inlet of the hyperbolic cooling tower; 2. Shorten the airflow path to avoid the disadvantage caused by the crosswind Influence, stabilize the intake air flow rate, minimize the airflow pressure loss; 3, decorative sound absorption module, observe the lighting module uniform specifications, can be uniformly produced in the processing plant, use the module fastening components to improve the efficiency of on-site installation work, reduce Setting cost; 4, decorative sound absorption module has good decoration and good weather resistance, which is beneficial to improve the landscape effect of sound insulation structure; 5. Convenient noise reduction system and cooling tower maintenance.

The invention will now be further described with reference to the drawings and embodiments.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a plan view showing a first embodiment of the present invention.

Fig. 2 is a side sectional structural view.

Figure 3 is a front elevational view of the decorative sound absorbing module, module mounting fastening structure.

Figure 4 is a side view of Figure 3.

Figure 5 is a front elevational view of the viewing daylighting module.

Figure 6 is a side view of Figure 5.

Figure 7 is a front view of the maintenance channel.

Figure 8 is a plan view of Figure 7.

Figure 9 is a side cross-sectional structural view showing a second embodiment of the present invention.

Fig. 10 is a partial enlarged view of Fig. 9;

Figure 1. Decorative sound absorption module, 11. Steel structure frame, 12. Elastic vibration isolation rubber strip, 13. Installation lifting ring, 14. Decorative steel plate, 15. Sound insulation damping pulp, 16. Sound absorbing material, 17. Waterproof sound insulation Film, 18. louver perforated plate, 19. structural adhesive, 2. observation lighting module, 21. steel structure frame, 22. inner vibration isolation mounting member, 23. sound insulation glass, 24. outer vibration isolation positioning member, 3. Installation support structure, 31. Bearing steel structure, 32. Concrete base, 33. Waterproof partition wall, 4. Module installation fastening structure, 41. Grooved steel, 42. Snap-on adjustable fastener, 43. L-shaped steel, 44. support steel, 45. fastening bolts, 46. drain holes, 5. maintenance channels, 6. cooling towers, 61. cooling tower air inlets, 62. ground, 63. noise sensitive points.

detailed description

The objects, the technical solutions, and the advantages of the present invention will become more apparent to those skilled in the art. The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the first embodiment shown in FIGS. 1 and 2, the hyperbolic cooling tower muffling system is fastened by the decorative sound absorbing module (1), the observation lighting module (2), the mounting support structure (3), and the module. The structure (4) and the maintenance channel (5) are composed of the decorative sound absorbing module (1) having the same specifications, the steel structure frame (11), the inner sound absorbing surface, the outer sound insulation decorative surface, and the elastic vibration isolation rubber strip ( 12) and the top mounting lifting ring (13); the observation lighting module (2) is composed of a steel structural frame (21), an internal vibration isolation mounting member (22), a sound insulating glass (23), and an external vibration isolation positioning member. (24), the shape specification and configuration are consistent with the decorative sound absorbing module (1); the mounting support structure (3) is composed of a bearing steel structure (31), a concrete base (32), and a waterproof partition wall (32). The module mounting fastening structure (4) is provided with a channel-shaped steel (41) for decorating the sound absorbing module (1) at the bottom, and an upper decorative sound absorbing module (1) for mounting a snap-type adjustable fastener (42) L-shaped steel (43), central support The decorative sound absorbing module (1) is composed of a supporting steel (44), and the grooved steel (41) is provided with a fastening bolt (45) on the inner side and a drain hole (46) at the bottom.

The module mounting fastening structure (4) is mounted on the bearing steel structure (31), and the plurality of decorative sound absorbing modules (1) are vertically installed outside the cooling tower (6) to form a curved partition centered on the cooling tower (6). The sound barrier has a plurality of curved sound insulation barriers, the outer layer is disposed on the waterproof partition wall (33), the inner layer is disposed at the top of the cooling tower air inlet (61), and the two arc-shaped sound insulation barriers are horizontally overlapped. Forming a stepped multi-layer curved sound insulation barrier with an outer low inner height.

When the noise sensitive point is only in a certain direction outside the cooling tower, at the position where the cooling tower air inlet (61) is gradually away from the noise sensitive point (63), the number of stepped arc sound insulation barrier layers is in the innermost layer and the middle inner side. The order of the layer, the secondary outer layer, the secondary inner layer, the middle outer layer, and the outermost layer is successively reduced.

The decorative sound absorbing module (1) shown in Figures 3 and 4 is fixed on the side of the steel structure frame (11) by a steel structure frame (11), an outer decorative steel plate (14), and a decorative steel plate (14). The steel plate (14) is coated with a sound-proof damping slurry (15) to form a sound-insulating decorative surface; the inner sound-absorbing surface is made of a sound absorbing material (16), a waterproof sound-permeable film (17), and a louver type perforated plate from the inside to the outside ( 18); elastic structural rubber strips (12) are respectively arranged on the inner side and the bottom of the steel structure frame (11); a gap of about 10 mm is reserved between the vertically installed decorative sound absorbing modules (1), and is closed by structural glue (19). .

The inner vibration isolation mounting member (22) of the observation lighting module (2) shown in the observation lighting module shown in Figs. 5 and 6 is installed inside the steel structure frame (21), and the sound insulating glass (23) is installed inside the partition. On the vibration mounting member (22), the outer vibration isolation positioning member (24) is installed outside the sound insulating glass (23), and the lighting module (2) is observed to be installed on the waterproof partition wall (33) in the outer arc-shaped sound insulation barrier.

The louver perforated plate (18) is installed with an opening downward facing the direction of the sound source.

The maintenance passage (5) shown in Figures 7 and 8 is disposed in the middle of the outer arc-shaped sound insulation barrier, and the second layer of the curved sound insulation barrier facing the maintenance passage (5) extends to the waterproof partition wall (33) Above, the width of the extension of the second layer of the arc-shaped sound barrier is greater than three times the width of the maintenance channel (5).

In the second embodiment shown in FIGS. 9 and 10, when the amount of noise reduction and noise reduction is high, the decorative steel plates (14) of the two decorative sound absorbing modules (1) are bonded to each other to form a composite sound absorbing sound. The module, an arc-shaped sound insulation barrier installed inside the outer layer, forms a double-sided sound-absorbing muffler insert.

To set up the muffling system for the hyperbolic cooling tower, follow these steps:

1. The noise evaluation is obtained by evaluating and analyzing the noise source distribution of the hyperbolic cooling tower and the actual measurement of the sensitive points;

2. Determine the direction of noise control and the total amount of noise reduction;

3. Develop a noise control design scheme for the hyperbolic cooling tower (including: layer number, height, spacing, and second layer of the arc-shaped sound insulation barrier) a horizontal overlap ratio between the arc-shaped sound insulation barriers, whether to implement a double-sided sound absorption arc-shaped sound insulation barrier scheme, etc.);

4. On-site investigation, forecasting and evaluation, and determining the design plan;

5. The construction plan is determined, and the construction drawings and node design drawings are drawn;

6, site stakeout, concrete pedestal (32), waterproof partition wall construction (33), installation support structure (3) construction;

7. The decorative sound absorption module (1) and the observation lighting module (2) are uniformly produced in the processing factory;

8. On-site hoisting and decorative sound absorbing module (1), which is installed layer by layer from inner layer to outer layer. Now, the bottom of the decorative sound absorbing module (1) is placed in the channel-shaped steel (41), and the top of the decorative sound absorbing module (1) is fastened with a snap-type adjustable fastener (42), and the fastening bolt (45) is fastened. Decorating the bottom of the sound absorbing module (1);

9. The outer layer is designed to be intermittently installed to observe the lighting module (2), and the maintenance channel (5) is reserved;

10. The gap between the hoisting decorative sound absorbing module (1) and the observation lighting module (2) is closed with structural glue (19).

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, and to non-hyperbolic cooling. Other occasions where the tower silences. All should be included in the scope of protection of the present invention.

Claims

A hyperbolic cooling tower muffling system is composed of a decorative sound absorbing module, an observation lighting module, a mounting support structure, a module installation fastening structure and a maintenance passage; the decorative sound absorbing module has uniform specifications, and is composed of a steel structure frame, The inner sound absorbing surface, the outer sound insulation decorative surface, the elastic vibration isolation rubber strip and the top mounting hoist ring; the observation lighting module is composed of a steel structure frame, an inner vibration isolation mounting member, an acoustic insulation glass, and an outer vibration isolation locating member. The shape specification and configuration are consistent with the decorative sound absorbing module; the installation support structure is composed of a bearing steel structure, a concrete base, and a waterproof partition wall; the module installation fastening structure is provided with a trough shape of the decorative sound absorbing module at the bottom. The steel and upper decorative sound absorbing modules are composed of L-shaped steel with snap-type adjustable fasteners and supporting steel for central supporting decorative sound absorbing modules. The grooved steel is installed with fastening bolts on the inner side and drain holes at the bottom; Features are:

The module installation fastening structure is mounted on the bearing steel structure, and the plurality of decorative sound absorbing modules are vertically installed outside the cooling tower to form an arc-shaped sound insulation barrier centered on the cooling tower, and the arc-shaped sound insulation barrier has multiple layers. The outer layer is arranged on the waterproof partition wall, the innermost layer is arranged outside the top of the air inlet of the cooling tower, and the two layers of arc-shaped sound insulation barriers are horizontally overlapped to form a stepped multi-layer curved sound insulation barrier with an outer low inner high shape;

In the position where the air inlet of the cooling tower is gradually away from the noise sensitive point, the number of the stepped arc sound insulation barrier is in the order of the innermost layer, the middle inner layer, the second outer layer, the inner inner layer, the middle outer layer, and the outermost layer. Decrease in number.
The hyperbolic cooling tower muffling system according to claim 1, wherein the inner vibration isolation mounting member of the observation lighting module is installed inside the steel structure frame, and the sound insulating glass is installed inside the vibration isolation installation. On the component, the outer vibration isolation locating member is installed outside the sound insulating glass, and the lighting module is observed to be installed on the waterproof partition wall in the outer curved sound insulation barrier.
The hyperbolic cooling tower muffling system according to claim 1, wherein said maintenance passage is disposed in a middle portion of an outer arc-shaped sound insulation barrier, and the second layer of the arc-shaped sound insulation barrier is directly opposite to the maintenance passage. To the waterproof partition wall, the width of the extension of the second arc-shaped sound barrier is greater than three times the width of the maintenance channel.
The hyperbolic cooling tower muffling system according to claim 1, wherein the decorative sound absorbing module is made of a steel structure frame, an outer decorative steel plate, and a decorative steel plate is folded at the side of the steel structure frame, and the decorative steel plate is inside. The sound-insulating damping slurry is coated to form a sound-insulating decorative surface; the inner sound-absorbing surface is made of sound absorbing material, waterproof sound-permeable film and louver-type perforated plate from the inside to the outside; elastic vibration-proof rubber strip is respectively arranged on the inner side and the bottom of the steel structure frame. A gap of about 10 mm is reserved between the vertically installed decorative sound absorbing modules, and is sealed with structural glue.
The hyperbolic cooling tower muffling system according to claim 1, wherein the louver type perforated plate is installed with an opening downward facing the sound source direction.
The hyperbolic cooling tower muffling system according to claim 1, wherein the surrounding surface of the arc-shaped sound insulation barrier is determined according to the position of the noise sensitive point, the number of layers of the arc-shaped sound insulation barrier, the spacing, The horizontal overlap ratio of the two-layer arc sound insulation barrier is determined according to the requirements of the noise reduction noise reduction.
The hyperbolic cooling tower muffling system according to claim 1, wherein when the noise reduction and noise reduction requirements are high, the decorative steel plate faces of the two decorative sound absorbing modules are bonded to form a composite sound insulation and sound absorption. The module, an arc-shaped sound insulation barrier installed inside the outer layer, forms a double-sided sound-absorbing muffler insert.