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The forms of fan silencers, exhaust pipe silencers, and drum induced draft fan silencers all adopt the principle of resistive sound absorption and noise reduction, which has good effects on medium and high frequency broadband characteristics, and the principle of resistive sound reduction and noise reduction, which has good effects on low, medium frequency, and pulsation characteristics, as well as micro perforated silencers and impedance composite silencers.
A resistive muffler is an absorption type muffler, which is generally divided into straight pipe, sheet, folded plate, honeycomb, acoustic flow, labyrinth, and elbow types according to the structure of the airflow channel. A resistive muffler utilizes the frictional and viscous resistance of sound waves propagating through porous sound-absorbing materials to convert sound energy into heat energy and dissipate it, thereby achieving the purpose of noise reduction. It is the most widely used type of muffler among all mufflers.
The principle of noise reduction for a resistant muffler is different from that of a resistive muffler. It cannot directly absorb sound energy, but instead uses a sudden interface or adjacent resonant cavity on the pipeline to reflect or interfere with certain frequency sound waves propagating along the pipeline at the sudden interface, thereby achieving the purpose of noise reduction. Divided into expansion chamber type muffler and resonance type muffler.
In practical noise control engineering, noise is mostly in the wideband. Therefore, resistive sound absorption and noise reduction structures are usually combined to control high-intensity wideband noise.
1Structural principles of impedance acoustic flow ventilation, exhaust pipes, and fan mufflers:
Based on the spectral characteristics obtained from actual testing of noise sources in various industrial fan operation sites, the main basis for designing sound absorbers and fluid channels is to determine the required amount of noise reduction in which spectral ranges. At the same time, narrow rectangular channels with large sound-absorbing material finishes are used to enhance the absorption effect. In addition, the noise source of the fan often has more than one spectral value at the maximum noise level, and the requirements for noise reduction vary for different spectral bands.
to this endGFThe series of ventilation duct silencers and drum induced draft fan silencers are both impedance acoustic flow type, using a resistive structure for absorbing and reducing high and medium frequency noise, and an anti type structure for reducing and reducing medium and low frequency noise. At the same time, two types of absorption and noise reduction zones, high frequency and low frequency, are used in the resistive channel to maximize the width of the noise reduction frequency band and achieve good noise reduction effect.
GFThe series of ventilation duct fan silencers and drum induced draft fan silencers are suitable for various centrifugal, axial, Roots fans and air compressors.
2Application and product characteristics of impedance acoustic flow fan muffler (fan muffler):
Fan is a universal mechanical equipment with a wide range of applications. Production in various industries such as power, mining, machinery, metallurgy, and chemical industry cannot do without fan. The noise generated by fans during operation often becomes a source of harm to workers' health and environmental disturbance. Especially for fans located near residential areas, the aerodynamic noise radiated from their inlet and outlet is a major factor in environmental pollution, forming a public hazard. It has become one of the main targets of noise pollution control in China's industrial sector in recent years.
Industrial fans are equipment that operates continuously. International Organization for Standardization(ISO）The noise standard specified for such equipment is ≤90Decibel, the new standard in China is the same as this, which is also the basis for industrial enterprises to achieve continuous noise standards. However, without using noise reduction measures, the noise emitted by the fan inlet and outlet to the environment can reach up to110～120Decibel levels greatly exceed the standard requirements.
This type of muffler (fan muffler) series products are impedance acoustic flow type. Our factory determines the required amount of noise reduction in the frequency spectrum range based on actual testing of various types of wind turbine operating noise sources in power plants. This is the main basis for designing sound-absorbing sheet structures and fluid channels. At the same time, narrow rectangular channels with large sound-absorbing material finishes are used to enhance the absorption effect. We know that the noise source of a fan often has more than one spectral value at the maximum noise level, and the requirements for its noise reduction vary for different spectral bands. For this purpose, this product adopts a resistive structure for silencing high and medium frequency noise, as well as an anti type structure for silencing medium and low frequency noise. At the same time, two types of silencing zones, high frequency and low frequency, are used in the resistive channel to maximize the broadening of the silencing frequency band and achieve good silencing effect.
After the user installs this product as required, its maximum noise level will not exceed85～90Decibel.
The impedance acoustic flow type muffler (muffler) introduced in this instruction is suitable for various centrifugal and axial flow fans. In addition, our company also designs and produces mufflers for various purposes such as gas turbines, Roots blowers, air compressors, and diesel engine exhausts. Users are welcome to inquire and purchase.
Impedance acoustic flow fan muffler (fan muffler) series and external dimensions:
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Serial Number
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model
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Fan nameplate(Air volume)
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Nominal size(m)
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Application examples of power plant boilers(For ordering reference)
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1
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GF--5
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4～6ten thousandm3/h
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B
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H
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N6Type of steam turbine35T/HBoiler blower inlet air
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2
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GF--7
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6～7
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1.2
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1.6
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N12Type of steam turbine60T/HBoiler blower inlet air
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3
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GF--10
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8～12
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1.2
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2.4
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N25Type of steam turbine120T/HBoiler blower inlet air
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4
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GF--13
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11～15
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1.6
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2.4
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5
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GF--18
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15～20
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2
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2.4
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N50Type of steam turbine220T/HBoiler blower inlet air
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6
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GF--20
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18～23
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2.4
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2.4
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7
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GF--23
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20～25
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2.0
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3.4
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N100-N125Type of steam turbine400-410T/HBoiler supply fan
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8
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GF--25
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23～29
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2.0
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4.0
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9
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GF--35
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30～42
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2.8
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3.2
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10
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GF--45
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38～50
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4.0
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3.0
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N200Type of steam turbine670T/HBoiler blower inlet air
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11
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GF--50
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45～60
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4.0
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3.2
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12
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GF--60
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50～70
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4.8
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4.0
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N310Type of steam turbine1000T/HBoiler axial flow fan
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13
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GF--70
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60～85
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5.2
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4.0
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14
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GF--90
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75～100
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5.5
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5.5
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15
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GF--100
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90～115
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5.6
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6.0
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3Ventilation and exhaust fan muffler (silencer) and fan muffler ordering instructions:
1. Silencing object and installation position Facilitate our company to select the best muffler model for your power plant
2. interface size Facilitating on-site installation and connection of your power plant
3. wind Quantity m3/H、m3/minperhapsm3/sec
4. press Strength Pa、 <, /SPAN>KPa、MPa
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